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CN117146169A - Control methods, systems, devices, equipment and storage media for cooling lubricating oil - Google Patents

Control methods, systems, devices, equipment and storage media for cooling lubricating oil Download PDF

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Publication number
CN117146169A
CN117146169A CN202311092325.2A CN202311092325A CN117146169A CN 117146169 A CN117146169 A CN 117146169A CN 202311092325 A CN202311092325 A CN 202311092325A CN 117146169 A CN117146169 A CN 117146169A
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CN
China
Prior art keywords
lubricating oil
motor
temperature
cooling lubricating
determining
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Pending
Application number
CN202311092325.2A
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Chinese (zh)
Inventor
郭振戈
薛龙
唐琛
柯孟龙
高伟
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Dongfeng Motor Group Co Ltd
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Dongfeng Motor Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dongfeng Motor Group Co Ltd filed Critical Dongfeng Motor Group Co Ltd
Priority to CN202311092325.2A priority Critical patent/CN117146169A/en
Publication of CN117146169A publication Critical patent/CN117146169A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N39/00—Arrangements for conditioning of lubricants in the lubricating system
    • F16N39/02—Arrangements for conditioning of lubricants in the lubricating system by cooling

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Details Of Gearings (AREA)

Abstract

The application provides a control method, a system, a device, equipment and a storage medium for cooling lubricating oil; wherein the method comprises the following steps: acquiring an accelerator opening signal of an accelerator pedal; under the condition that the system temperature of the power assembly system meets the preset condition, determining a first flow of cooling lubricating oil based on driving habit of a driver and an accelerator opening signal; wherein the first flow rate characterizes a flow rate of the cooling lubricating oil required during an expected acceleration time of the vehicle; the driving habit of the driver is information reflecting the driving behavior of the driver obtained by data analysis of the driving data of the driver; and determining the first oil pump rotating speed according to the first flow, and controlling the oil pump to rotate according to the first oil pump rotating speed so as to drive the cooling lubricating oil to flow between the oil tank and the power train. According to the embodiment of the application, the working efficiency of the cooling lubricating oil system can be improved, so that the cooling efficiency of the cooling lubricating oil system is realized.

Description

Control method, system, device, equipment and storage medium for cooling lubricating oil
Technical Field
The application relates to the technical field of automobile driving, in particular to a control method, a system, a device, equipment and a storage medium for cooling lubricating oil.
Background
The power assembly system is an important part in the vehicle and is responsible for converting energy generated by the motor into power of the vehicle to drive the vehicle to advance, and mainly comprises the motor, a speed changer, a transmission shaft, a differential mechanism and the like. In thermal management of powertrain systems, it is common to monitor the temperature of components at the cooling locations in the powertrain system to determine whether cooling requirements are met.
In the related art, when the temperature corresponding to the motor or the controller is monitored, after the temperature reaches a set value, corresponding signals are sent and received to the controller of the cooling lubricating oil system, and decision judgment is made, so that the rotating speed of the oil pump is controlled. However, a certain time is required to be consumed when the corresponding position of the power train is cooled by the method, so that certain hysteresis exists when the cooling lubricating oil system cools the power train, and the working efficiency of the cooling lubricating oil system is lower.
Disclosure of Invention
The embodiment of the application provides a control method, a system, a device, equipment and a storage medium for cooling lubricating oil, which can improve the working efficiency of a cooling lubricating oil system, thereby realizing the cooling efficiency of the cooling lubricating oil system.
The technical scheme of the application is realized as follows:
in a first aspect, an embodiment of the present application provides a control method for a cooling lubricating oil system, which is applied to a controller of the cooling lubricating oil system, and the method includes:
acquiring an accelerator opening signal of an accelerator pedal;
under the condition that the system temperature of the power assembly system meets the preset condition, determining a first flow of cooling lubricating oil based on driving habit of a driver and an accelerator opening signal; wherein the first flow rate characterizes a flow rate of the cooling lubricating oil required during an expected acceleration time of the vehicle; the driving habit of the driver is information reflecting the driving behavior of the driver obtained by data analysis of the driving data of the driver;
and determining the first oil pump rotating speed according to the first flow, and controlling the oil pump to rotate according to the first oil pump rotating speed so as to drive the cooling lubricating oil to flow between the oil tank and the power train.
According to the technical means, the controller comprehensively judges according to the driving habit of the driver and the accelerator opening degree signal to determine the first flow of the cooling lubricating oil liquid, so that the cooling lubricating oil liquid is more in line with the driving habit of the driver, and therefore, the flow of the cooling lubricating oil liquid is timely adjusted according to the driving habit of the driver, the hysteresis of the cooling lubricating oil liquid system is effectively avoided, the working efficiency of the cooling lubricating oil liquid system can be improved, and the cooling high efficiency of the cooling lubricating oil liquid system is realized.
Further, determining a first flow rate of the cooling lubricating oil based on the driving habit of the driver and the accelerator opening signal, comprising: determining an estimated acceleration time of the vehicle based on the driving habit of the driver; and determining a first flow of cooling lubricating oil according to the accelerator opening signal and the estimated acceleration time.
According to the technical means, the flow of the cooling lubricating oil is comprehensively judged according to the estimated acceleration time and the accelerator opening degree signals of the vehicle, which are determined according to driving habits, so that the controller can be helped to adjust the rotation speed of the oil pump, and the cooling efficiency and timeliness of the cooling lubricating oil system are realized.
Further, determining an estimated acceleration time of the vehicle based on the driving habits of the driver includes: predicting a target speed of the vehicle according to driving habits of a driver; determining acceleration of the vehicle according to the motor torque corresponding to the target speed and the accelerator opening signal; the predicted acceleration time is determined based on the acceleration of the vehicle, the target speed, and the current speed of the vehicle.
According to the technical means, since the target speed of the vehicle is related to the driving habit of the driver, the controller can pre-judge the target speed of the vehicle in advance according to the driving habit of the driver, and further quickly and accurately determine the estimated acceleration time of the vehicle by using the target speed.
Further, determining a first flow rate of the cooling lubricating oil based on the accelerator opening signal and the predicted acceleration time, comprising: acquiring a first heat generation amount of a motor controller;
determining a second heat generation amount of the motor according to the current value, the resistance value and the predicted acceleration time of the motor; determining a first heat dissipation capacity of the cooling lubricating oil system according to the first heat generation capacity and the second heat generation capacity; determining a first flow of cooling lubricating oil according to the first heat dissipation capacity, the temperature variation of the system temperature of the power assembly system, the specific heat capacity of the cooling lubricating oil and the density value of the cooling lubricating oil through a preset heat exchange model; the preset heat exchange model is used for representing the relation between the flow of the cooling lubricating oil liquid and the heat dissipation capacity of the system.
According to the technical means, the first heat dissipation capacity of the cooling lubricating oil system can be determined according to the obtained estimated acceleration time, and then the first flow of the cooling lubricating oil can be rapidly and accurately determined according to the first heat dissipation capacity through the preset heat exchange model.
Further, determining a first oil pump speed from the first flow rate includes: acquiring the displacement and the volumetric efficiency of an oil pump; and determining the rotating speed of the first oil pump according to the displacement, the volumetric efficiency and the first flow of the cooling lubricating oil.
According to the technical means, the first oil pump rotating speed can be determined according to the displacement, the volumetric efficiency and the first flow of the oil pump, so that the oil pump is controlled by the first oil pump rotating speed, and cooling lubricating oil liquid is driven to flow between the oil tank and the power assembly system, so that the effect of timely cooling the power assembly system is achieved.
Further, the method also comprises the following steps: determining a second flow of cooling lubricating oil based on the accelerator opening signal under the condition that the system temperature of the power assembly system does not meet the preset condition; wherein the second flow characterizes a flow of the cooling lubricating oil required per unit time; and determining the second oil pump rotating speed according to the second flow, and controlling the oil pump to rotate according to the second oil pump rotating speed so as to drive the cooling lubricating oil to flow between the oil tank and the power assembly system.
According to the technical means, under the condition that the system temperature of the power assembly system does not meet the preset condition, the second flow of the cooling lubricating oil can be determined directly according to the accelerator opening signal, and then the real-time regulation and control of the oil pump are realized according to the second oil pump rotation speed determined by the second flow, so that the flow of the cooling lubricating oil can be timely regulated under the condition that the system temperature does not meet the preset condition, the working efficiency of the cooling lubricating oil system can be improved, and the cooling efficiency of the cooling lubricating oil system is realized.
Further, determining a second flow rate of the cooling lubricant based on the accelerator opening signal, comprising: determining motor torque and motor rotation speed according to the accelerator opening signal; determining the output power of the motor according to the motor torque and the motor rotating speed; determining a current value of the motor according to the output power of the motor and the voltage value of the motor; determining a third heat generation amount of the motor according to the current value of the motor and the resistance value of the motor; wherein the third heat generation amount characterizes the heat generation amount of the motor in unit time; and determining a second heat dissipation capacity of the cooling lubricating oil liquid system based on the third heat generation capacity, and determining a second flow rate of the cooling lubricating oil liquid according to the second heat dissipation capacity.
According to the technical means, the second flow of the cooling lubricating oil can be accurately and efficiently determined in real time according to the accelerator opening signal, so that the second flow can be utilized to realize real-time adjustment of the rotation speed of the oil pump, and the hysteresis of a cooling lubricating oil system is effectively avoided.
Further, prior to determining the first flow rate of the cooling lubricating oil based on the driving habit of the driver and the accelerator opening signal, the method further comprises: acquiring the system temperature of the power assembly system at the current moment; and determining that the system temperature of the power assembly system meets the preset condition under the condition that the system temperature at the current moment is smaller than or equal to a first temperature threshold value and/or the temperature variation of the system temperature at the current moment is smaller than or equal to a second temperature threshold value.
According to the technical means, whether the system temperature of the power train meets the preset condition can be judged according to the system temperature at the current moment and the temperature variation of the system temperature at the current moment. Therefore, the flow of the cooling lubricating oil can be dynamically adjusted according to different conditions, and the adjustment of the rotation speed of the oil pump under different scenes can be used, so that the working efficiency of the cooling lubricating oil system can be improved.
Further, the system temperature includes: motor temperature and motor controller temperature; the first preset temperature threshold comprises a first threshold and a second threshold, and the second temperature threshold comprises a third threshold and a fourth threshold; before determining the first flow rate of the cooling lubricating oil based on the driving habit of the driver and the accelerator opening signal, the method further comprises: acquiring the motor temperature at the current moment and the motor controller temperature at the current moment; determining a first temperature variation of the motor according to the motor temperature at the current moment and the motor temperature at the last moment; determining a second temperature variation of the motor controller according to the temperature of the motor controller at the current moment and the temperature of the motor controller at the last moment; and determining that the system temperature of the power assembly system meets the preset condition under the condition that the motor temperature at the current moment is smaller than or equal to a first threshold value and the motor controller temperature at the current moment is smaller than or equal to a second threshold value and/or the first temperature variation is smaller than or equal to a third threshold value and the second temperature variation is smaller than or equal to a fourth threshold value.
According to the technical means, whether the system temperature of the power train meets the preset condition can be judged according to the motor temperature at the current moment and the motor controller temperature at the current moment or the variation of the motor temperature and the variation of the motor controller temperature. Therefore, the efficiency of judging that the system temperature of the power assembly system meets the preset condition is improved, the calculation complexity is reduced, and the working efficiency of the cooling lubricating oil system can be improved.
In a second aspect, an embodiment of the present application provides a cooling lubricating oil system for cooling and lubricating a power train, the cooling lubricating oil system including:
the oil tank is used for storing cooling lubricating oil liquid and cooling the cooling lubricating oil liquid; the oil tank is communicated with the power assembly system through an oil inlet pipeline and an oil outlet pipeline;
the oil pump is used for driving cooling lubricating oil to flow between the oil tank and the power assembly system;
the temperature sensor is used for collecting the system temperature of the power assembly system; the temperature sensor is arranged in the power assembly system;
the accelerator signal sensor is used for acquiring an accelerator opening signal by detecting the position of an accelerator pedal; the accelerator signal sensor is connected with an accelerator pedal;
The controller is used for determining the first flow of the cooling lubricating oil liquid based on the driving habit of a driver and the throttle opening signal under the condition that the system temperature of the power assembly system meets the preset condition; and determining the first oil pump rotating speed according to the first flow, and controlling the oil pump to rotate according to the first oil pump rotating speed so as to drive the cooling lubricating oil to flow between the oil tank and the power train.
In a third aspect, an embodiment of the present application provides a control device for cooling lubricating oil, where the device includes an acquisition unit and a determination unit; wherein,
the acquisition unit is used for acquiring an accelerator opening signal of an accelerator pedal;
the determining unit is used for determining the first flow of the cooling lubricating oil liquid based on the driving habit of a driver and the throttle opening signal under the condition that the system temperature of the power train meets the preset condition; wherein the first flow rate characterizes a flow rate of the cooling lubricating oil required during an expected acceleration time of the vehicle; the driving habit of the driver is information reflecting the driving behavior of the driver obtained by data analysis of the driving data of the driver; and determining the first oil pump rotating speed according to the first flow, and controlling the oil pump to rotate according to the first oil pump rotating speed so as to drive the cooling lubricating oil to flow between the oil tank and the power train.
In a fourth aspect, an embodiment of the present application provides an electronic device, including: the system comprises a processor and a memory, wherein the memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory to execute the control method of the cooling lubricating oil liquid.
In a fifth aspect, an embodiment of the present application provides a computer readable storage medium storing a computer program, where the computer program is executed by at least one processor to implement the control method for cooling lubricating oil.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. It is evident that the drawings in the following description are only some embodiments of the present application and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
The flow diagrams depicted in the figures are exemplary only, and do not necessarily include all of the elements and operations/steps, nor must they be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.
FIG. 1 is a schematic diagram of an alternative cooling lubricating oil system according to an embodiment of the present application;
FIG. 2 is a schematic flow chart of an alternative method for controlling cooling of lubricating oil according to an embodiment of the present application;
FIG. 3 is a second flow chart of an alternative method for controlling cooling of lubricating oil according to an embodiment of the present application;
FIG. 4 is a schematic flow chart III of an alternative method for controlling cooling of lubricating oil according to an embodiment of the present application;
FIG. 5 is a schematic view showing the constitution of an alternative device for cooling lubricating oil according to the present application;
fig. 6 is a schematic diagram of the composition structure of an alternative electronic device provided by the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present embodiment more apparent, a specific technical solution of the present application will be described in further detail with reference to the accompanying drawings in the present embodiment. The following examples are illustrative of the application and are not intended to limit the scope of the application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the present application is for the purpose of describing the embodiments only and is not intended to be limiting of the application.
In the following description reference is made to "some embodiments," "this embodiment," and examples, etc., which describe a subset of all possible embodiments, but it is to be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with one another without conflict.
If a similar description of "first/second" appears in the application document, the following description is added, in which the terms "first/second/third" are merely distinguishing between similar objects and not representing a particular ordering of the objects, it being understood that the "first/second/third" may be interchanged with a particular order or precedence, where allowed, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein.
The term "and/or" in this embodiment is merely an association relationship describing an associated object, and indicates that three relationships may exist, for example, object a and/or object B may indicate: object a exists alone, object a and object B exist simultaneously, and object B exists alone
Based on the above, the application provides a control method for cooling lubricating oil, which mainly comprises the following steps: firstly, acquiring an accelerator opening signal of an accelerator pedal; then, under the condition that the system temperature of the power train meets the preset condition, determining a first flow of cooling lubricating oil based on driving habit of a driver and an accelerator opening signal; wherein the first flow rate characterizes a flow rate of the cooling lubricating oil required during an expected acceleration time of the vehicle; the driving habit of the driver is information reflecting the driving behavior of the driver obtained by data analysis of the driving data of the driver; finally, a first oil pump speed is determined based on the first flow, and the oil pump is controlled to rotate in accordance with the first oil pump speed to drive the cooling lubrication fluid to flow between the oil tank and the powertrain system. Because the controller comprehensively judges according to the driving habit of the driver and the accelerator opening degree signal, the first flow of the cooling lubricating oil liquid is determined, so that the cooling lubricating oil liquid is more in line with the driving habit of the driver, the hysteresis quality of the cooling lubricating oil liquid system is effectively avoided, the working efficiency of the cooling lubricating oil liquid system can be improved, and the cooling high efficiency of the cooling lubricating oil liquid system is realized.
The control method of the cooling lubricating oil provided by the embodiment of the invention can be executed by the control device of the cooling lubricating oil and the electronic equipment, wherein the control device of the cooling lubricating oil can be stored in the electronic equipment in the form of a software functional model, the control device of the cooling lubricating oil can also be integrated in the electronic equipment as a hardware functional module, and the control device of the cooling lubricating oil can also be combined with the electronic equipment in software and hardware to realize the control method of the cooling lubricating oil.
In the embodiment of the present invention, the electronic device may be a server, which may be an independent physical server, or may be a server cluster or a distributed system formed by a plurality of physical servers, or may be a cloud server that provides cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, CDNs, and basic cloud computing services such as big data and an artificial intelligence platform.
In addition, the electronic device may also be a terminal device, which may be a mobile phone, a Tablet Personal Computer (TPC), a media player, a smart television, a notebook computer (LC), a Personal Digital Assistant (PDA), a Personal Computer (PC), a camera, a video camera, a smart watch, a Wearable Device (WD), or an autonomous vehicle, etc., which is not limited in the embodiment of the present invention.
The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings.
In the embodiment of the application, the control method of the cooling lubricating oil liquid and the cooling lubricating oil liquid system can be applied to the technical field of vehicle control, such as new energy vehicles. The cooling lubricating oil system is mainly used for controlling and maintaining the temperature inside the system and ensuring the normal operation of equipment and vehicles. Specifically, on the one hand, the cooling lubricating oil plays a key role in the automobile engine, and through cooling liquid circulation, the working temperature of the power assembly system can be effectively reduced, overheat is prevented, so that parts of the power assembly system are protected, the working efficiency of the power assembly system is improved, and the service life of the power assembly system is prolonged. On the other hand, in the running process of the power assembly system, as all parts can rub each other in the running process, the parts can be lubricated by the lubricating oil liquid, so that the service life and the working time of all the parts are prolonged.
Fig. 1 is a schematic structural diagram of an alternative cooling lubricating oil system according to an embodiment of the present application, as shown in fig. 1, where the cooling lubricating oil system according to the embodiment of the present application is applied to a vehicle 1, and the vehicle 1 includes: cooling lubricating oil system 10, powertrain system 20, and accelerator pedal 30. The cooling lubricating oil system 10 cools and lubricates the power train 20, and the cooling lubricating oil system 10 is connected with the power train 10. Since the engine system (motor, etc.) in the powertrain system affects its combustion efficiency and the life of the components when operating at high temperatures, the operating temperature of the engine system can be reduced by circulating the cooling lubricating oil in the cooling lubricating oil system, preventing overheating. In addition, the cooling lubricating oil system not only can cool parts in the power assembly system, but also can lubricate all moving parts, such as a crankshaft, a piston and the like, and can reduce abrasion and friction among the parts by providing sufficient lubrication for all the parts in the power assembly system, thereby ensuring the normal operation of the power assembly system and further improving the service life and the working performance of all the parts.
In some embodiments of the present application, as shown in FIG. 1, the powertrain system 20 includes: a motor 21 and a motor controller 22. Wherein the motor 21 is connected to a motor controller 22, the motor controller 22 is adapted to control the motor 21, which may adjust the output of the motor 21, such as motor torque and motor speed, etc., by the driver's demand and vehicle system status. In the embodiment of the present application, the components of the powertrain system 20 are merely taken as an example, and other components may be included in the actual application scenario, which is not limited in any way.
In some embodiments of the present application, as shown in FIG. 1, a cooling lubricating oil system 10 includes: the fuel tank 11, the oil pump 12, the temperature sensor 13, the throttle signal sensor 14 and the controller 15. The oil tank 11, the oil pump 12, the temperature sensor 13, the throttle signal sensor 14 are all connected with the controller 15. The temperature sensor 13 is connected with the power train 20, the oil pump 12 is connected with the oil tank 11, and the accelerator signal sensor 14 is connected with the accelerator pedal 30.
In some embodiments of the present application, the oil tank 11 is used for storing the cooling lubricating oil and cooling the cooling lubricating oil; the oil tank 11 and the power train 20 are communicated with each other through an oil inlet pipe 111 and an oil outlet pipe 112.
In the embodiment of the application, the oil tank 11 is used as a storage container of the cooling lubricating oil system, and stores enough cooling lubricating oil for the system to be used at any time so as to ensure lubrication and cooling of all parts in the power train. The oil tank 11 can store the cooling lubricating oil liquid for cooling, because heat is generated in the operation process of the cooling lubricating oil liquid, such as the high-speed operation of an engine and transmission parts, the oil liquid in the oil tank can be cooled by the aid of a large-area heat dissipation surface, so that the temperature of the oil liquid in the oil tank is kept within a proper range. In addition, the inside of the oil tank 11 may be provided with an exhaust system for exhausting gas and steam generated in cooling the lubricating oil to maintain stability and performance of the oil, and the steam may be cooled by heat dissipation to prevent the system from being excessively pressurized. In addition, the interior of the tank 11 may be provided with a precipitation and filtration zone for separating impurities and contaminants from the oil, thereby ensuring the oil quality of the feed system. In general, the oil tank 11 is an important component in a system for cooling lubricating oil, and is used for storing oil, and maintaining the quality of the oil through cooling, exhausting, filtering and the like so as to ensure the normal operation and the service life of the power assembly system. It should be noted that, in the embodiment of the present application, the structure of the oil tank 11 is merely taken as an example, and other components may be included in a practical application scenario, and the embodiment of the present application is not limited in any way.
In some embodiments of the application, an oil pump 12 is used to drive the flow of cooling lubricating oil between the oil tank 11 and the drive train 20.
In an embodiment of the present application, the oil pump 12 pumps cooling lubricating oil between various components in the powertrain system 20, such as: and the motor controller are used for ensuring the normal operation of the power assembly system. Specifically, the oil pump 12 directs the cooling lubricating oil to the various components of the powertrain system to absorb and carry away heat generated by the components so that the operating temperatures of the various components remain within a suitable range.
In some embodiments of the application, a temperature sensor 13 is used to acquire the system temperature of the powertrain system 20.
In the embodiment of the present application, the temperature sensor 13 may be disposed inside the powertrain system or may be disposed outside the powertrain system, which is not limited in this regard, and may be specifically selected in a practical application scenario.
In some embodiments of the present application, as shown in fig. 1, the temperature sensor 13 includes: a motor temperature sensor 131 and a motor control temperature sensor 132; the system temperature includes: motor temperature and motor controller temperature; the motor temperature sensor 131 is used for acquiring the motor temperature, and the motor control temperature sensor 132 is used for acquiring the motor controller temperature. Wherein, motor temperature sensor 131 is connected with motor 21, and motor control temperature sensor 132 is connected with motor controller 22.
In some embodiments of the present application, the throttle signal sensor 14 is configured to acquire a throttle opening signal by detecting a position of the throttle pedal 30; the accelerator signal sensor 14 is connected to an accelerator pedal 30.
In the embodiment of the present application, the accelerator signal sensor 14 is also referred to as an accelerator position sensor or an accelerator pedal sensor, and the accelerator signal sensor 14 determines the accelerator opening of the engine (motor) by measuring the degree of depression of the accelerator pedal by the driver, thereby controlling the output power of the motor and the running speed of the vehicle.
In some embodiments of the present application, the controller 15 determines the first flow rate of the cooling lubricating oil based on the driving habit of the driver and the accelerator opening signal in the case where the system temperature of the powertrain system 20 satisfies the preset condition; based on the first flow rate, a first oil pump speed is determined and the oil pump 12 is controlled to rotate in accordance with the first oil pump speed to drive the flow of cooling lubricating oil between the oil tank 11 and the drive train 20.
In the present application, the operation of the oil pump may be controlled by the controller 15, and in particular, the controller 15 controls the operation of the electronic pump by outputting a control current to the oil pump. It can be appreciated that the larger the control current, the larger the operating power of the electronic pump, the faster the rotational speed of the electronic pump, and further the faster the oil flow speed.
Based on the cooling lubricating oil system shown in fig. 1, the embodiment of the application further provides a control method of cooling lubricating oil, fig. 2 is a schematic flow chart of an alternative control method of cooling lubricating oil provided in the embodiment of the application, as shown in fig. 2, the method includes S101 to S103:
s101, acquiring an accelerator opening signal of an accelerator pedal.
In the embodiment of the present application, the control method of cooling the lubricating oil is applied to the controller 15 in the cooling lubricating oil system 10, which will be hereinafter referred to as a controller for short.
In the embodiment of the application, the accelerator opening signal is a signal for reflecting the degree of the driver stepping on the accelerator pedal, and can inform the vehicle control system that the driver wants to increase the power, and can be expressed in a percentage value form. For electric vehicles, when a driver depresses an accelerator pedal, a motor controller of the electric vehicle can adjust an output torque (also referred to as a motor torque) of a motor and a motor rotation speed according to an accelerator opening signal, thereby achieving acceleration and controlling a speed of the vehicle.
In the embodiment of the application, when a driver steps on the accelerator pedal, the accelerator signal sensor acquires an accelerator opening signal by detecting the position of the accelerator pedal, and meanwhile, the accelerator signal sensor sends the accelerator opening signal to the controller so that the controller acquires the accelerator opening signal of the accelerator pedal.
In the embodiment of the application, an accelerator pedal is connected with an accelerator signal sensor.
S102, under the condition that the system temperature of the power assembly system meets the preset condition, determining a first flow of cooling lubricating oil based on driving habit of a driver and an accelerator opening signal; wherein the first flow rate characterizes a flow rate of the cooling lubricating oil required during an expected acceleration time of the vehicle; the driving habit of the driver is information reflecting the driving behavior of the driver obtained by data analysis of the driving data of the driver.
In the embodiment of the application, when the controller determines that the system temperature of the power assembly system meets the preset condition, the controller determines the first flow of the cooling lubricating oil according to the driving habit of the driver and the accelerator opening signal.
In the embodiment of the application, the driving habit of the driver is information obtained by data analysis of driving data of the driver and used for reflecting the driving behavior of the driver, and specifically, the driving habit of the driver refers to a series of driving behaviors and habits formed by the driver in a daily driving configuration. Driving habits may include: acceleration and deceleration behavior information, steering and cornering behavior information, travel speed behavior information, rapid acceleration and rapid braking behavior information, long distance and city driving behavior information, and the like. It should be noted that the driving habits of the driver described herein are only an example, and other driving habits are also included in the actual scenario, which is not limited in any way by the embodiments of the present application.
The acceleration and deceleration behavior information refers to, for example, the manner in which the driver operates when starting, accelerating, decelerating, braking, and is suddenly depressing the accelerator or brake pedal. Steering and cornering behavior information refers to whether or not driving is turning, changing lanes, cornering, etc. The running speed behavior information refers to whether the driver is often running at overspeed or low speed, whether a steady cruising speed is maintained, and so on. The rapid acceleration and rapid braking behavior information refers to whether the driver is rapidly accelerating or rapidly braking, and whether the driver is aware of a smooth driving state. Long distance and city driving behavior information refers to the driving performance of a driver in long distance or city traffic, whether to change lanes frequently, stop frequently, etc. The driving behavior information may also refer to whether the driver prefers to be stationary, aggressive, pursuing speed, etc. during driving.
It can be understood that by collecting and analyzing driving habit data of a driver, the controller can know the behavior characteristics of the driver, so that intelligent control and decision of the rotation speed of the oil pump can be performed, efficient operation of the cooling lubricating oil system can be realized, and cooling efficiency of the cooling lubricating oil system can be realized.
In an embodiment of the present application, the process of determining the driving habit of the driver according to the driving data of the driver may include:
1) And (3) data acquisition: driving data is collected by sensors and devices installed in the vehicle, such as: acceleration sensors, brake sensors, steering sensors, vehicle speed sensors, etc., which record various actions and behaviors of the vehicle during driving;
2) And (3) data processing: the collected driving data may include noise or unnecessary information, and data processing including data cleaning, denoising and the like is required to ensure the accuracy and usability of the data;
3) And (3) extracting features: extracting useful features from the processed driving data, wherein the features can be key indexes in driving behaviors, such as acceleration data, braking force, turning speed and the like;
4) Modeling, training, and validation: the driving habit is determined by modeling using a machine learning algorithm or a statistical method, for example: decision trees, support vector machines, neural networks, and the like. These models may relate features of the driving data to known driving habits so that the driving habits of the driver may be predicted. After modeling, training and verifying the model by using known driving habits and data, wherein the model can learn the relation between driving behaviors and driving habits through training, and then evaluate the performance and accuracy of the model through verifying the data;
5) Classification of driving habits: according to the trained model, the driving behavior of the driver is mapped to different driving habit categories, such as: aggressive driving, smooth driving, etc. In the actual driving process, the controller can collect driving data of the vehicle in real time, and the driving habit of the driver in the current period is judged by using the trained model, so that the controller can be helped to adjust the rotation speed of the oil pump, and the cooling efficiency of the cooling lubricating oil liquid system is realized.
For example, the controller may continuously collect driving data during daily driving, including, for example, vehicle speed, lateral acceleration, time, vehicle music, map information, etc., and upload the collected driving data to the cloud. And training the artificial intelligent neural network (or other models) by the cloud according to the acquired driving data, and acquiring the trained neural network from the cloud by the controller. The controller collects driving data at the current moment and judges the driving habit of the driver according to the neural network. The driving habit includes conditions such as hard driving and normal driving, and the embodiment of the present application is not limited in any way.
In the embodiment of the application, the controller comprehensively judges based on the driving habit of a driver and the throttle opening signal to determine the first flow of the cooling lubricating oil; wherein the first flow rate characterizes a flow rate of the cooling lubricating oil required during an expected acceleration time of the vehicle.
In an embodiment of the application, the estimated acceleration time of the vehicle is related to the driving style of the driver.
In some embodiments of the present application, as shown in fig. 3, determining the implementation of the first flow rate of the cooling lubricating oil in S102 based on the driving habit of the driver and the accelerator opening signal may include: s201 to S202:
s201, determining the estimated acceleration time of the vehicle based on the driving habit of the driver.
In an embodiment of the application, the controller determines the estimated acceleration time of the vehicle according to the driving habit of the driver. Wherein the predicted acceleration time characterizes a time at which the vehicle accelerates to a target speed at an initial speed.
It can be understood that according to the above technical means, the flow rate of the cooling lubricating oil is comprehensively judged according to the estimated acceleration time and the accelerator opening signal of the vehicle determined by driving habits, which can help the controller to adjust the rotation speed of the oil pump, and realize the cooling efficiency and timeliness of the cooling lubricating oil system.
In some embodiments of the present application, determining the implementation of the predicted acceleration time of the vehicle based on the driving habit of the driver in S201 may include S2011 to S2013:
and S2011, predicting the target speed of the vehicle according to the driving habit of the driver.
In the embodiment of the application, the controller can predict the target speed of the vehicle according to the driving habit of the driver according to the driving mode model. The driving pattern model may be a neural network model. For example, the driving mode model may predict a possible speed change of the driver in a future period of time according to acceleration habits, braking behaviors, and the like of the driver.
By way of example, the target speed may be 50km/h when the driver is familiar with accelerating to 50km/h with deep throttle or other vehicle speeds and then driving at a constant speed.
And S2012, determining the acceleration of the vehicle according to the motor torque corresponding to the target speed and the accelerator opening degree signal.
In an embodiment of the application, the motor torque may be determined from a motor characteristic curve. The motor characteristic curve describes the torque which can be output by the motor at different motor speeds, and the controller finds the corresponding motor torque on the characteristic curve according to the accelerator opening signal.
In the embodiment of the application, the controller determines the net torque of the motor according to the motor torque corresponding to the accelerator opening signal. Wherein the net torque of the motor is the torque generated by subtracting the resistance from the motor torque, and represents the torque actually used for acceleration, and the resistance comprises: rolling resistance, air resistance, etc.
In the embodiment of the application, the controller may obtain the acceleration of the vehicle according to newton's second law, where newton's second law may be represented by formula (1):
F＝m·a (1)
in the formula (1), F represents the net force of the motor, m represents the mass of the vehicle, a represents the acceleration of the vehicle, and F is obtained by converting the net torque of the motor.
It should be noted that the implementation of determining the acceleration of the vehicle using newton's second law is only a simplified implementation, and in a practical scenario, factors such as a transmission system, a motor control strategy, and the like may also need to be considered. In addition, the motor torque and the acceleration of the vehicle may also be affected by the temperature of components such as the motor and the battery, and therefore, in practical applications, it is necessary to calculate the acceleration of the vehicle accurately by comprehensively considering a plurality of factors.
S2013, determining the estimated acceleration time according to the acceleration of the vehicle, the target speed and the current speed of the vehicle.
In an embodiment of the present application, the controller may determine the predicted acceleration time according to formula (2):
a＝(v 1 -v 2 )/t (2)
in the formula (2), a represents the acceleration of the vehicle, v 1 Representing a target speed of the vehicle, v 2 Representing the current speed of the vehicle, and t represents the predicted acceleration time of the vehicle.
In the embodiment of the application, in the process of calculating the estimated acceleration time, the current speed of the vehicle needs to be considered, and if the current speed is close to the target speed, the acceleration time may be short, and even the target speed may be reached without acceleration.
It should be noted that, the manner of determining the estimated acceleration time by the formula (2) is only a simplified implementation, and in a practical scenario, the acceleration time of the vehicle may be affected by various factors, such as: road conditions, vehicle load, driver operation, etc. Therefore, in practical applications, accurate real-time monitoring and adjustment are required to obtain more accurate predicted acceleration time.
It can be appreciated that according to the above technical means, since the target speed of the vehicle is related to the driving habit of the driver, the controller can pre-determine the target speed of the vehicle in advance according to the driving habit of the driver, and further determine the predicted acceleration time of the vehicle quickly and accurately by using the target speed.
S202, determining a first flow of cooling lubricating oil according to an accelerator opening signal and the estimated acceleration time.
In the embodiment of the application, the controller determines the first flow of the cooling lubricating oil according to the accelerator opening signal and the predicted acceleration time.
In some embodiments of the present application, determining the implementation of the first flow rate of the cooling lubricating oil in S202 according to the accelerator opening signal and the predicted acceleration time may include S2021 to S2024:
s2021, acquiring a first heat generation amount of the motor controller.
In the embodiment of the application, the first heat generation amount of the motor controller can be obtained through performance parameters provided by manufacturers.
S2022, determining the second heat generation amount of the motor according to the current value, the resistance value and the predicted acceleration time of the motor.
In an embodiment of the present application, the controller may determine the second heat generation amount of the motor according to formula (3):
Q＝I 2 Rt (3)
in the formula (3), Q represents the second heat generation amount of the motor, I represents the current value of the motor, R represents the resistance value of the motor, and t represents the estimated acceleration time of the vehicle.
It should be noted that, the manner of determining the second heat generating amount of the motor by the formula (3) is merely a simplified implementation, and in a practical scenario, the heat generating amount of the motor may be affected by various factors, on one hand, may be affected by specific design, operating state, external environment, and the like of the motor, and in order to obtain more accurate heat generating amount of the motor, more detailed analysis and calculation of the performance curve of the motor may be required. On the other hand, in a practical scenario, the efficiency of the motor does not reach 100%, so that the efficiency factor of the motor should be considered, thereby obtaining more accurate heat generation of the motor.
S2023, determining the first heat dissipation capacity of the cooling lubricating oil system according to the first heat generation capacity and the second heat generation capacity.
In the embodiment of the application, the controller can determine the first heat dissipation capacity of the cooling lubricating oil system according to the first heat generation capacity and the second heat generation capacity through the heat balance principle.
In the embodiment of the application, the principle of heat balance refers to the condition that in a closed system, the input and output of heat are equal, so that the temperature inside the system is kept constant or the area is constant.
In the embodiment of the application, the first heat generation amount of the motor and the second heat generation amount of the motor controller are utilized to be equal to the first heat dissipation amount and other possible heat loss of the cooling lubricating oil system by utilizing the heat balance principle, so that the first heat dissipation amount of the cooling lubricating oil system can be determined by the first heat generation amount and the second heat generation amount.
For example, the sum of the first heat generation amount and the second heat generation amount may be taken as the first heat dissipation amount of the cooling lubricating oil system, regardless of the influence of other factors.
S2024, determining a first flow of cooling lubricating oil according to the first heat dissipation capacity, the temperature variation of the system temperature of the power assembly system, the specific heat capacity of the cooling lubricating oil and the density value of the cooling lubricating oil through a preset heat exchange model; the preset heat exchange model is used for representing the relation between the flow of the cooling lubricating oil liquid and the heat dissipation capacity of the system.
In the embodiment of the application, the preset heat exchange model can be represented by the formula (4):
Q′＝C p *ρ*q*ΔT (4)
in the formula (4), Q' represents a first heat dissipation capacity of the cooling lubricating oil system, C p The specific heat capacity of the cooling lubricating oil liquid is represented by ρ, the density value of the cooling lubricating oil liquid is represented by Δt, the temperature change amount of the system temperature of the power assembly system is represented by q, and the first flow rate of the cooling lubricating oil liquid is represented by q.
The controller may divide the first heat dissipation amount Q' by a temperature variation amount DeltaT of a system temperature of the powertrain system, a specific heat capacity C of the cooling lubricating oil p And the density value rho of the cooling lubricating oil liquid, so as to obtain the first flow q of the cooling lubricating oil liquid.
It can be appreciated that according to the above technical means, the first heat dissipation capacity of the cooling lubricating oil system can be determined according to the obtained estimated acceleration time, and then the first flow of the cooling lubricating oil can be rapidly and accurately determined according to the first heat dissipation capacity through a preset heat exchange model.
And S103, determining the rotation speed of the first oil pump according to the first flow, and controlling the rotation of the oil pump according to the rotation speed of the first oil pump so as to drive the cooling lubricating oil to flow between the oil tank and the power train.
In some embodiments of the present application, determining the implementation of the first oil pump rotation speed according to the first flow rate in S103 may include S1031 to S1032:
And S1031, acquiring the displacement and the volumetric efficiency of the oil pump.
S1032, determining the rotation speed of the first oil pump according to the displacement, the volumetric efficiency and the first flow of the cooling lubricating oil.
In the embodiment of the present application, the controller may determine the first oil pump rotation speed through formula (5):
q＝n*V*η (5)
in the formula (5), q represents a first flow rate of the cooling lubricating oil, n represents a first oil pump rotation speed, V represents a cylinder displacement of the oil pump, and η represents volumetric efficiency of the oil pump.
For example, for equation (5), the controller divides the first flow rate q of the cooling lubricating oil by the displacement V and volumetric efficiency η of the oil pump to obtain the first oil pump speed n.
It can be appreciated that according to the above technical means, the first oil pump rotational speed can be determined according to the displacement, the volumetric efficiency and the first flow of the oil pump, so that the control of the oil pump is realized by utilizing the first oil pump rotational speed, so as to drive the cooling lubricating oil to flow between the oil tank and the power train, and realize the effect of timely cooling the power train.
In an embodiment of the present application, a control method for cooling lubricating oil is provided, including: acquiring an accelerator opening signal of an accelerator pedal; under the condition that the system temperature of the power assembly system meets the preset condition, determining a first flow of cooling lubricating oil based on driving habit of a driver and an accelerator opening signal; wherein the first flow rate characterizes a flow rate of the cooling lubricating oil required during an expected acceleration time of the vehicle; and determining the first oil pump rotating speed according to the first flow, and controlling the oil pump to rotate according to the first oil pump rotating speed so as to drive the cooling lubricating oil to flow between the oil tank and the power train. Because the controller comprehensively judges according to the driving habit of the driver and the accelerator opening degree signal, the first flow of the cooling lubricating oil liquid is determined, so that the cooling lubricating oil liquid is more in line with the driving habit of the driver, the hysteresis quality of the cooling lubricating oil liquid system is effectively avoided, the working efficiency of the cooling lubricating oil liquid system can be improved, and the cooling high efficiency of the cooling lubricating oil liquid system is realized.
In some embodiments of the present application, based on fig. 2, as shown in fig. 4, the method further includes S104 to S105:
s104, determining a second flow of cooling lubricating oil based on the accelerator opening signal under the condition that the system temperature of the power assembly system does not meet the preset condition; wherein the second flow rate characterizes a flow rate of the cooling lubricating oil required per unit time.
In the embodiment of the application, under the condition that the system temperature of the power assembly system does not meet the preset condition, the controller determines the second flow rate of the cooling lubricating oil in unit time according to the accelerator opening signal.
It can be understood that the second flow of the cooling lubricating oil is dynamically adjusted in real time based on the accelerator opening signal so as to ensure the normal operation of the power assembly system, thereby improving the working performance and the working efficiency of the power assembly system.
In some embodiments of the present application, determining the implementation of the second flow rate of the cooling lubricating oil based on the accelerator opening signal in S104 may include S1041 to S1045:
s1041, determining the motor torque and the motor rotation speed according to the accelerator opening signal.
In the embodiment of the application, the controller can determine the motor torque and the motor rotation speed corresponding to the accelerator opening signal according to the motor characteristic curve.
In the embodiment of the application, the motor torque represents the rotation moment generated by the motor, and the motor rotation speed represents the rotation speed of the motor.
S1042, determining the output power of the motor according to the motor torque and the motor rotation speed.
In an embodiment of the present application, the controller may determine the output power of the motor according to formula (6):
P＝T*ω (6)
in the formula (6), P represents the output power of the motor, T represents the motor torque, and ω represents the angular velocity of the motor.
In an embodiment of the present application, the controller may determine the angular velocity of the motor according to formula (7):
ω＝2π*n/60 (7)
in the formula (7), ω represents the angular velocity of the motor, and n represents the motor rotation speed.
It should be noted that, the controller may determine the output power of the motor according to the formula (6) and the formula (7), but in practical application, factors such as efficiency and loss of the motor are also generally considered to accurately determine the output power of the motor.
S1043, determining a current value of the motor according to the output power of the motor and the voltage value of the motor.
In the embodiment of the application, the controller can divide the output power of the motor and the voltage value of the motor so as to determine the current value of the motor.
In the embodiment of the application, in order to more accurately determine the current of the motor, the efficiency of the motor can be considered, that is, the current value of the motor can be calculated according to the output power of the motor, the voltage value of the motor and the efficiency of the motor.
S1044, determining a third heat generation amount of the motor according to the current value of the motor and the resistance value of the motor; wherein the third heat generation amount characterizes the heat generation amount of the motor in a unit time.
In the embodiment of the application, the controller can obtain the third heat generation amount of the motor in unit time by using the formula (3).
S1045, determining a second heat dissipation capacity of the cooling lubricating oil system based on the third heat generation capacity, and determining a second flow rate of the cooling lubricating oil according to the second heat dissipation capacity.
In the embodiment of the application, the controller can determine the second heat dissipation capacity of the cooling lubricating oil system based on the third heat generation capacity through the heat balance principle.
In an embodiment of the present application, the controller may determine the second flow rate of the cooling lubricating oil according to formula (4).
By way of example, the controller determines the second flow rate of the cooling lubricating oil based on the second heat dissipation capacity, the temperature variation of the system temperature of the powertrain system, the specific heat capacity of the cooling lubricating oil, and the density value of the cooling lubricating oil by presetting the heat exchange model.
It can be understood that according to the technical means, the second flow of the cooling lubricating oil can be accurately and efficiently determined in real time according to the accelerator opening signal, so that the second flow can be utilized to realize real-time adjustment of the rotation speed of the oil pump, and the hysteresis of a cooling lubricating oil system is effectively avoided.
And S105, determining the rotation speed of the second oil pump according to the second flow, and controlling the rotation of the oil pump according to the rotation speed of the second oil pump so as to drive the cooling lubricating oil to flow between the oil tank and the power train.
In the embodiment of the present application, the controller may determine the second oil pump rotation speed according to the second flow rate according to the formula (5).
Illustratively, the controller determines the second oil pump speed based on the displacement per unit time, the volumetric efficiency, and the second flow rate of the oil pump.
In addition, S102 to S103 and S104 to S105 are parallel schemes, and after S101 is executed, S102 to S103 may be executed, or S104 to S105 may be executed.
It can be understood that according to the above technical means, under the condition that the system temperature of the power assembly system does not meet the preset condition, the second flow of the cooling lubricating oil can be determined directly according to the accelerator opening signal, and then the real-time regulation and control of the oil pump can be realized according to the second oil pump rotation speed determined by the second flow, so that the flow of the cooling lubricating oil can be timely regulated under the condition that the system temperature does not meet the preset condition, the working efficiency of the cooling lubricating oil system can be improved, and the cooling efficiency of the cooling lubricating oil system can be realized.
In some embodiments of the present application, determining the first flow of cooling lubricating oil based on the driving habit of the driver and the accelerator opening signal in S102 includes:
acquiring the system temperature of the power assembly system at the current moment;
and determining that the system temperature of the power assembly system meets the preset condition under the condition that the system temperature at the current moment is smaller than or equal to a first temperature threshold value and/or the temperature variation of the system temperature at the current moment is smaller than or equal to a second temperature threshold value.
The system temperature at the current time of the powertrain system in the embodiment of the present application refers to the temperature state of the entire powertrain system (including the engine, the transmission system, etc.) at a certain time. This temperature can be measured and monitored by various temperature sensors, which are typically distributed at different locations to obtain temperature information both inside and outside the system.
In the embodiment of the application, the first temperature threshold value and the second temperature threshold value are preset values.
It can be appreciated that according to the above technical means, whether the system temperature of the powertrain system satisfies the preset condition can be determined according to the system temperature at the current time and the temperature variation of the system temperature at the current time. Therefore, the flow of the cooling lubricating oil can be dynamically adjusted according to different conditions, and the adjustment of the rotation speed of the oil pump under different scenes can be used, so that the working efficiency and accuracy of the cooling lubricating oil system can be improved.
In some embodiments of the application, the system temperature comprises: motor temperature and motor controller temperature; the first preset temperature threshold includes a first threshold and a second threshold, and the second temperature threshold includes a third threshold and a fourth threshold.
In the embodiment of the application, the first threshold value, the second threshold value, the third threshold value and the fourth threshold value are preset values.
In some embodiments of the present application, determining the first flow of cooling lubricating oil based on the driving habit of the driver and the accelerator opening signal in S102 includes:
acquiring the motor temperature at the current moment and the motor controller temperature at the current moment;
determining a first temperature variation of the motor according to the motor temperature at the current moment and the motor temperature at the last moment;
determining a second temperature variation of the motor controller according to the temperature of the motor controller at the current moment and the temperature of the motor controller at the last moment;
and determining that the system temperature of the power assembly system meets the preset condition under the condition that the motor temperature at the current moment is smaller than or equal to a first threshold value and the motor controller temperature at the current moment is smaller than or equal to a second threshold value and/or the first temperature variation is smaller than or equal to a third threshold value and the second temperature variation is smaller than or equal to a fourth threshold value.
It can be appreciated that according to the above technical means, whether the system temperature of the powertrain system satisfies the preset condition can be determined according to the motor temperature at the current time and the motor controller temperature at the current time, or the variation of the motor temperature and the variation of the motor controller temperature. Therefore, the efficiency of judging that the system temperature of the power assembly system meets the preset condition is improved, the calculation complexity is reduced, and the working efficiency of the cooling lubricating oil system can be improved.
The control method of the cooling lubricating oil system provided by the application is explained in detail in a specific embodiment.
The control method of the cooling lubricating oil system provided by the embodiment of the application is applied to a controller of the cooling lubricating oil system, and specifically relates to the following steps: the power assembly controller (i.e. controller), the power assembly system, the accelerator opening signal, the motor temperature, the motor controller temperature and the oil pump rotating speed. The control method of the cooling lubricating oil system provided by the embodiment of the application relates to two control methods, and the control modes of the two cooling lubricating oil systems are described below.
1) A first control method (i.e., a first control method) of the cooling lubricating oil system: the first control method is mainly characterized in that the driving habit of a driver and the accelerator opening degree signal are comprehensively judged, and the rotation speed of the oil pump is controlled, so that the efficient work of the cooling lubricating oil system is realized.
In the embodiment of the application, after a driver purchases a vehicle, the driving habit (driving style) of the driver is determined through data collection of the driving style of the driver for a period of time (gentle driving, severe driving (sudden addition or subtraction)), and preference in the acceleration process is focused.
In the embodiment of the application, based on the driving habit of a driver, in the actual running process of a vehicle, a power assembly controller (controller) collects temperature data of a current motor and a motor controller, and gives corresponding oil pump rotating speed, so that cooling and lubricating flow can meet the heat dissipation requirement at the moment, when the driver steps on an accelerator pedal to accelerate, the rotating speed of an oil pump is regulated and controlled according to the collected accelerating style preference of the driver, and in general, when the driving style is severe, the rotating speed of the oil pump is increased more, otherwise, the rotating speed of the oil pump is increased less. Specifically, a calculation formula (formula 2) may be set, the acceleration time is predicted according to the accelerator opening signal, the power and the heat dissipation capacity of the motor and the motor controller are calculated according to the acceleration time, the flow rate (flow rate of cooling lubricating oil) required to be increased at this time is calculated according to a heat exchange formula (formula 4), and the corresponding rotation speed (oil pump rotation speed) is calculated.
2) A second control method (namely a second control method) for cooling the lubricating oil system: even the same driver may have a change in driving style or other persons driving the vehicle, in order to avoid the problem caused by the failure of the first control method under the working condition, the second control method is set at the same time, that is, the control is performed according to the actual temperatures of the motor and the motor controller.
In the embodiment of the application, a system capable of cooling lubricating oil can be controlled efficiently, and the influence of control lag on the performance of the whole vehicle and the quality of parts is avoided.
The preferred embodiments of the present application have been described in detail above with reference to the accompanying drawings, but the present application is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present application within the scope of the technical concept of the present application, and all the simple modifications belong to the protection scope of the present application. For example, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further. As another example, any combination of the various embodiments of the present application may be made without departing from the spirit of the present application, which should also be regarded as the disclosure of the present application. For example, on the premise of no conflict, the embodiments described in the present application and/or technical features in the embodiments may be combined with any other embodiments in the prior art, and the technical solutions obtained after combination should also fall into the protection scope of the present application.
It should be understood that, in the various method embodiments of the present invention, the sequence number of each process described above does not mean that the execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of this embodiment.
Based on the same inventive concept as the foregoing embodiments, fig. 5 is a schematic structural diagram of an alternative cooling lubricating oil control device according to the present invention, and as shown in fig. 5, a cooling lubricating oil control device 40 includes: acquisition unit 41 and determination unit 42:
the acquiring unit 41 is configured to acquire an accelerator opening signal of an accelerator pedal;
the determining unit 42 is configured to determine a first flow rate of the cooling lubricating oil based on a driving habit of a driver and the accelerator opening signal when a system temperature of the powertrain system meets a preset condition; wherein the first flow rate characterizes a flow rate of the cooling lubricating oil required during an expected acceleration time of the vehicle; the driving habit of the driver is information which is obtained by carrying out data analysis on driving data of the driver and is used for reflecting driving behaviors of the driver; and determining a first oil pump rotating speed according to the first flow, and controlling the oil pump to rotate according to the first oil pump rotating speed so as to drive the cooling lubricating oil to flow between the oil tank and the power train.
In some embodiments of the application, the determining unit 42 is further configured to determine the estimated acceleration time of the vehicle based on driving habits of the driver; and determining the first flow of the cooling lubricating oil according to the accelerator opening signal and the estimated acceleration time.
In some embodiments of the present application, the determining unit 42 is further configured to predict a target speed of the vehicle according to a driving habit of the driver; determining the acceleration of the vehicle according to the target speed and the motor torque corresponding to the accelerator opening signal; the predicted acceleration time is determined based on the acceleration of the vehicle, the target speed, and a current speed of the vehicle.
In some embodiments of the present application, the determining unit 42 is further configured to obtain a first heat generation amount of the motor controller; determining a second heat generation amount of the motor according to the current value, the resistance value and the estimated acceleration time of the motor; determining a first heat dissipation capacity of the cooling lubricating oil system according to the first heat generation capacity and the second heat generation capacity; determining a first flow of the cooling lubricating oil according to the first heat dissipation capacity, the temperature variation of the system temperature of the power train, the specific heat capacity of the cooling lubricating oil and the density value of the cooling lubricating oil through a preset heat exchange model; the preset heat exchange model is used for representing the relation between the flow of the cooling lubricating oil liquid and the heat dissipation capacity of the system.
In some embodiments of the application, the determining unit 42 is further configured to obtain a displacement and a volumetric efficiency of the oil pump; and determining the rotating speed of the first oil pump according to the displacement, the volumetric efficiency and the first flow of the cooling lubricating oil.
In some embodiments of the present application, the determining unit 42 is further configured to determine, based on the accelerator opening signal, a second flow rate of the cooling lubricating oil if a system temperature of the powertrain system does not meet a preset condition; wherein the second flow rate characterizes a flow rate of the cooling lubricating oil required per unit time; and determining a second oil pump rotating speed according to the second flow, and controlling the oil pump to rotate according to the second oil pump rotating speed so as to drive the cooling lubricating oil to flow between the oil tank and the power train.
In some embodiments of the present application, the determining unit 42 is further configured to determine a motor torque and a motor rotation speed according to the accelerator opening signal; determining the output power of the motor according to the motor torque and the motor rotating speed; determining a current value of the motor according to the output power of the motor and the voltage value of the motor; determining a third heat generation amount of the motor according to the current value of the motor and the resistance value of the motor; wherein the third heat generation amount characterizes the heat generation amount of the motor in a unit time; and determining a second heat dissipation capacity of the cooling lubricating oil system based on the third heat generation capacity, and determining the second flow of the cooling lubricating oil according to the second heat dissipation capacity.
In some embodiments of the present application, the determining unit 42 is further configured to obtain a system temperature at a current time of the powertrain system; and determining that the system temperature of the power train meets the preset condition under the condition that the system temperature at the current moment is smaller than or equal to a first temperature threshold value and/or the temperature variation of the system temperature at the current moment is smaller than or equal to a second temperature threshold value.
In some embodiments of the application, the system temperature comprises: motor temperature and motor controller temperature; the first preset temperature threshold comprises a first threshold and a second threshold, and the second temperature threshold comprises a third threshold and a fourth threshold; the determining unit 42 is further configured to obtain a motor temperature at a current time and a motor controller temperature at the current time; determining a first temperature variation of the motor according to the motor temperature at the current moment and the motor temperature at the last moment; determining a second temperature variation of the motor controller according to the current motor controller temperature and the last motor controller temperature; and determining that the system temperature of the power train meets the preset condition under the condition that the motor temperature at the current moment is smaller than or equal to the first threshold value and the motor controller temperature at the current moment is smaller than or equal to the second threshold value, and/or that the first temperature variation is smaller than or equal to a third threshold value and the second temperature variation is smaller than or equal to the fourth threshold value.
It should be understood by those skilled in the art that the above description of the control device for cooling lubricating oil of the present embodiment can be understood with reference to the description of the control method for cooling lubricating oil of the present embodiment.
Fig. 6 is a schematic diagram of the composition structure of an alternative electronic device provided by the present invention. As shown in fig. 6, the electronic device 50 includes a processor 51 and a memory 52, the memory 52 may store a computer program, and the processor 51 may call and run the computer program from the memory 52 to implement the method in the present embodiment.
The memory 52 may be a separate device independent of the processor 51, or may be integrated in the processor 51.
In some embodiments, as shown in fig. 6, the electronic device 50 may further include a transceiver 53, and the processor 51 may control the transceiver 53 to communicate with other devices, and in particular, may transmit information or data to other devices, or receive information or data transmitted by other devices.
The transceiver 53 may include a transmitter and a receiver, among others. The transceiver 53 may further include antennas, the number of which may be one or more.
In some embodiments, a vehicle is provided that includes the electronic device 50 described above.
It will be appreciated that the memory in this embodiment may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (Double Data Rate SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DR RAM). It should be noted that the memory described herein is intended to comprise, without being limited to, these and any other suitable types of memory.
The present embodiment also provides a computer-readable storage medium storing a computer program.
In some embodiments, the computer readable storage medium may be applied to the server in the present embodiment, and when the computer program is executed by at least one processor, the corresponding flow implemented by the server in each method of the present embodiment is implemented, which is not described herein for brevity.
In some embodiments, the computer readable storage medium may be applied to the graphics processor in this embodiment, and when the computer program is executed by at least one processor, the corresponding flow implemented by the graphics processor in each method of this embodiment is implemented, which is not described herein for brevity.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the apparatus and units described above may refer to corresponding procedures in the foregoing method embodiments, which are not described herein again.
In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
It should be noted that, in the present invention, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing embodiment numbers are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
The methods disclosed in the method embodiments provided by the invention can be arbitrarily combined under the condition of no conflict to obtain a new method embodiment.
The features disclosed in the several product embodiments provided by the invention can be combined arbitrarily under the condition of no conflict to obtain new product embodiments.
The features disclosed in the embodiments of the method or the apparatus provided by the invention can be arbitrarily combined without conflict to obtain new embodiments of the method or the apparatus.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (14)

1. A method of controlling a chilled lubricating oil system, the method comprising:
acquiring an accelerator opening signal of an accelerator pedal;
Under the condition that the system temperature of the power assembly system meets the preset condition, determining a first flow of cooling lubricating oil based on the driving habit of a driver and the accelerator opening signal; wherein the first flow rate characterizes a flow rate of the cooling lubricating oil required during an expected acceleration time of the vehicle; the driving habit of the driver is information which is obtained by carrying out data analysis on driving data of the driver and is used for reflecting driving behaviors of the driver;
and determining a first oil pump rotating speed according to the first flow, and controlling the oil pump to rotate according to the first oil pump rotating speed so as to drive the cooling lubricating oil to flow between the oil tank and the power train.
2. The method of claim 1, wherein determining the first flow of cooling lubricating oil based on the driver's driving habits and the accelerator opening signal comprises:
determining the estimated acceleration time of the vehicle based on the driving habits of the driver;
and determining the first flow of the cooling lubricating oil according to the accelerator opening signal and the estimated acceleration time.
3. The method of claim 2, wherein the determining the predicted acceleration time of the vehicle based on the driving habits of the driver comprises:
Predicting a target speed of the vehicle according to the driving habit of the driver;
determining acceleration of the vehicle according to the target speed and the motor torque corresponding to the accelerator opening signal;
the predicted acceleration time is determined based on the acceleration of the vehicle, the target speed, and the current speed of the vehicle.
4. The method of claim 2, wherein said determining a first flow rate of said cooling lubricating oil based on said accelerator opening signal and said predicted acceleration time comprises:
acquiring a first heat generation amount of a motor controller;
determining a second heat generation amount of the motor according to the current value, the resistance value and the estimated acceleration time of the motor;
determining a first heat dissipation capacity of the cooling lubricating oil system according to the first heat generation capacity and the second heat generation capacity;
determining a first flow of the cooling lubricating oil according to the first heat dissipation capacity, the temperature variation of the system temperature of the power train, the specific heat capacity of the cooling lubricating oil and the density value of the cooling lubricating oil through a preset heat exchange model; the preset heat exchange model is used for representing the relation between the flow of the cooling lubricating oil liquid and the heat dissipation capacity of the system.
5. The method of claim 1, wherein determining a first oil pump speed from the first flow rate comprises:
acquiring the displacement and the volumetric efficiency of the oil pump;
and determining the rotating speed of the first oil pump according to the displacement, the volumetric efficiency and the first flow of the cooling lubricating oil.
6. The method according to any one of claims 1 to 5, further comprising:
determining a second flow rate of the cooling lubricating oil based on the accelerator opening signal under the condition that the system temperature of the power train does not meet a preset condition; wherein the second flow rate characterizes a flow rate of the cooling lubricating oil required per unit time;
and determining a second oil pump rotating speed according to the second flow, and controlling the oil pump to rotate according to the second oil pump rotating speed so as to drive the cooling lubricating oil to flow between the oil tank and the power train.
7. The method of claim 6, wherein determining the second flow rate of the cooling lubricating oil based on the accelerator opening signal comprises:
determining motor torque and motor rotation speed according to the accelerator opening signal;
Determining the output power of the motor according to the motor torque and the motor rotating speed;
determining a current value of the motor according to the output power of the motor and the voltage value of the motor;
determining a third heat generation amount of the motor according to the current value of the motor and the resistance value of the motor; wherein the third heat generation amount characterizes the heat generation amount of the motor in a unit time;
and determining a second heat dissipation capacity of the cooling lubricating oil system based on the third heat generation capacity, and determining the second flow of the cooling lubricating oil according to the second heat dissipation capacity.
8. The method according to any one of claims 1 to 7, wherein before the determining of the first flow rate of the cooling lubricating oil based on the driving habit of the driver and the accelerator opening signal, the method further comprises:
acquiring the system temperature of the power assembly system at the current moment;
and determining that the system temperature of the power train meets the preset condition under the condition that the system temperature at the current moment is smaller than or equal to a first temperature threshold value and/or the temperature variation of the system temperature at the current moment is smaller than or equal to a second temperature threshold value.
9. The method of claim 1 or 8, wherein the system temperature comprises: motor temperature and motor controller temperature; the first preset temperature threshold comprises a first threshold and a second threshold, and the second temperature threshold comprises a third threshold and a fourth threshold;
before the first flow rate of the cooling lubricating oil is determined based on the driving habit of the driver and the accelerator opening signal, the method further comprises:
acquiring the motor temperature at the current moment and the motor controller temperature at the current moment;
determining a first temperature variation of the motor according to the motor temperature at the current moment and the motor temperature at the last moment;
determining a second temperature variation of the motor controller according to the current motor controller temperature and the last motor controller temperature;
and determining that the system temperature of the power train meets the preset condition under the condition that the motor temperature at the current moment is smaller than or equal to the first threshold value and the motor controller temperature at the current moment is smaller than or equal to the second threshold value, and/or that the first temperature variation is smaller than or equal to a third threshold value and the second temperature variation is smaller than or equal to the fourth threshold value.
10. A cooling and lubricating oil system for cooling and lubricating a powertrain system, the cooling and lubricating oil system comprising:
the oil tank is used for storing cooling lubricating oil liquid and cooling the cooling lubricating oil liquid; the oil tank is communicated with the power assembly system through an oil inlet pipeline and an oil outlet pipeline;
an oil pump for driving the flow of the cooling lubricating oil between the oil tank and the powertrain system;
the temperature sensor is used for acquiring the system temperature of the power train;
the accelerator signal sensor is used for acquiring an accelerator opening signal by detecting the position of an accelerator pedal; the accelerator signal sensor is connected with the accelerator pedal;
the controller is used for determining the first flow of the cooling lubricating oil liquid based on the driving habit of a driver and the accelerator opening signal under the condition that the system temperature of the power assembly system meets the preset condition; and determining a first oil pump rotating speed according to the first flow, and controlling the oil pump to rotate according to the first oil pump rotating speed so as to drive the cooling lubricating oil to flow between the oil tank and the power train.
11. The system of claim 10, wherein the temperature sensor comprises: a motor temperature sensor and a motor control temperature sensor; the system temperature includes: motor temperature and motor controller temperature; the motor temperature sensor is used for collecting the motor temperature, and the motor control temperature sensor is used for collecting the motor controller temperature.
12. A control device for cooling lubricating oil, characterized in that the device comprises an acquisition unit and a determination unit; wherein,
the acquisition unit is used for acquiring an accelerator opening signal of an accelerator pedal;
the determining unit is used for determining a first flow of cooling lubricating oil liquid based on driving habit of a driver and the accelerator opening signal under the condition that the system temperature of the power train meets preset conditions; wherein the first flow rate characterizes a flow rate of the cooling lubricating oil required during an expected acceleration time of the vehicle; the driving habit of the driver is information which is obtained by carrying out data analysis on driving data of the driver and is used for reflecting driving behaviors of the driver; and determining a first oil pump rotating speed according to the first flow, and controlling the oil pump to rotate according to the first oil pump rotating speed so as to drive the cooling lubricating oil to flow between the oil tank and the power train.
13. An electronic device, comprising: a processor and a memory for storing a computer program, the processor being adapted to call and run the computer program stored in the memory, to perform the control method of the cooling lubricating oil according to any one of claims 1 to 9.
14. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed by at least one processor, implements a method of controlling a cooling lubricating oil according to any one of claims 1 to 9.
CN202311092325.2A 2023-08-28 2023-08-28 Control methods, systems, devices, equipment and storage media for cooling lubricating oil Pending CN117146169A (en)

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