CN119177906A - Vehicle, engine start control method, device and medium - Google Patents
Vehicle, engine start control method, device and medium Download PDFInfo
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- CN119177906A CN119177906A CN202411301461.2A CN202411301461A CN119177906A CN 119177906 A CN119177906 A CN 119177906A CN 202411301461 A CN202411301461 A CN 202411301461A CN 119177906 A CN119177906 A CN 119177906A
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- engine
- rotating speed
- generator
- oil injection
- output torque
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits specially adapted for starting of engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
- F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
Abstract
The application discloses a vehicle, an engine starting control method, a device and a medium, wherein the method comprises the steps of identifying the current output torque of a generator in the process of dragging the engine to start by the generator, and controlling the engine to perform oil injection ignition when the rotating speed of the engine reaches a set oil injection rotating speed threshold value if the current output torque of the generator is smaller than the set torque threshold value, wherein the torque threshold value is the minimum torque required by the generator to drag the rotating speed of the engine to the starting completion rotating speed, the oil injection rotating speed threshold value is the initial rotating speed after the engine performs oil injection ignition, the oil injection rotating speed threshold value is smaller than the initial oil injection rotating speed threshold value, and the initial oil injection rotating speed threshold value is the initial rotating speed before the engine performs oil injection ignition when the output torque of the generator is larger than or equal to the torque threshold value. The application can improve the starting success rate of the engine, thereby improving the starting performance of the vehicle.
Description
Technical Field
The application belongs to the technical field of vehicle control, and particularly relates to a starting control method, device and medium of a vehicle and an engine.
Background
With the technical development of the hybrid electric vehicle, the P1 motor replaces the function of the conventional starter, and the P1 motor is used for outputting torque to drag the engine to a higher rotation speed rapidly so as to start the engine, so that the output torque capacity of the P1 motor influences whether the engine can be started successfully, and when the torque of the P1 motor is limited, the engine cannot be dragged to the required target rotation speed rapidly, so that the engine fails to start or the engine cannot be started for the first time, and the problem that multiple starts are needed is solved.
Disclosure of Invention
The embodiment of the application provides a vehicle, a starting control method, a device and a medium of an engine, and further can improve the starting success rate of the engine at least to a certain extent, thereby improving the starting performance of the vehicle.
Other features and advantages of the application will be apparent from the following detailed description, or may be learned by the practice of the application.
According to a first aspect of an embodiment of the present application, there is provided an engine start control method including:
in the process that the generator drags the engine to start, the current output torque of the generator is identified;
And if the current output torque of the generator is smaller than a set torque threshold, controlling the engine to perform oil injection ignition when the rotating speed of the engine reaches a set oil injection rotating speed threshold, wherein the torque threshold is the minimum torque required by the generator to drag the rotating speed of the engine to a starting completion rotating speed, the oil injection rotating speed threshold is the corrected initial rotating speed corresponding to the oil injection ignition of the engine, the oil injection rotating speed threshold is smaller than an initial oil injection rotating speed threshold, and the initial oil injection rotating speed threshold is the initial rotating speed before the correction corresponding to the oil injection ignition of the engine when the output torque of the generator is larger than or equal to the torque threshold.
In some embodiments of the present application, based on the foregoing, the controlling the engine to perform fuel injection ignition includes:
acquiring current atmospheric pressure and current coolant temperature of the engine;
Determining a target output torque corresponding to the current atmospheric pressure and the current coolant temperature according to the set corresponding relation;
And controlling the engine to perform oil injection ignition so as to achieve the target output torque.
In some embodiments of the present application, based on the foregoing aspect, the determining the target output torque corresponding to the current atmospheric pressure and the current coolant temperature determination according to the set correspondence includes:
acquiring a set mapping relation table, wherein a plurality of air inflow amounts, and atmospheric pressure and cooling liquid temperature corresponding to each air inflow amount are recorded in the mapping relation table, wherein the cooling liquid temperature and the air inflow amount are in negative correlation;
traversing the mapping relation table to determine a target air inflow corresponding to the current atmospheric pressure and the current cooling liquid temperature;
and determining the target output torque according to the set linear corresponding relation between the target air inflow and the target output torque.
In some embodiments of the application, based on the foregoing, after controlling the engine to perform fuel injection ignition, the method further includes:
And controlling the generator to continuously drag the engine according to the current output torque so as to increase the rotating speed of the engine to the starting completion rotating speed based on the driving of the oil injection ignition of the engine and the dragging of the generator to the engine.
In some embodiments of the application, based on the foregoing, after controlling the engine to perform fuel injection ignition, the method further includes:
And controlling the power battery to increase the discharge power within a preset time period, so that the current output torque of the generator is larger than the torque threshold value, and dragging the rotating speed of the engine to increase to a target rotating speed, wherein the target rotating speed is larger than the upper limit value of a resonance rotating speed interval of the engine and the hybrid gearbox.
In some embodiments of the present application, based on the foregoing solution, the controlling the power battery to increase the discharge power for a preset period of time includes:
Acquiring total output torque required by the generator to drag the engine to reach the target rotating speed from the oil injection rotating speed threshold;
determining the total discharge power required by the power battery in the preset time period and the corresponding instantaneous discharge power in the unit time period according to the total output torque;
and controlling the power battery to supply power to the generator according to the instantaneous discharge power.
In some embodiments of the application, based on the foregoing, the identifying the current output torque of the generator includes:
and if the vehicle is in the in-situ state, identifying the current output torque of the generator.
According to a second aspect of the embodiment of the present application, there is provided an engine start control apparatus including:
the identifying unit is used for identifying the current output torque of the generator in the process of dragging the engine to start by the generator;
And the control unit is used for controlling the engine to perform oil injection ignition when the rotating speed of the engine reaches a set oil injection rotating speed threshold value if the current output torque of the generator is smaller than the set torque threshold value, wherein the torque threshold value is the minimum torque required by the generator to drag the rotating speed of the engine to the starting completion rotating speed, the oil injection rotating speed threshold value is the initial rotating speed after the engine performs oil injection ignition corresponding correction, the oil injection rotating speed threshold value is smaller than the initial oil injection rotating speed threshold value, and the initial oil injection rotating speed threshold value is the initial rotating speed before the engine performs oil injection ignition corresponding correction when the output torque of the generator is larger than or equal to the torque threshold value.
According to a third aspect of embodiments of the present application, there is provided a computer readable storage medium having stored therein at least one computer program instruction that is loaded and executed by a processor to implement the operations performed by the method as described in any of the first aspects.
According to a fourth aspect of embodiments of the present application there is provided a vehicle comprising one or more processors and one or more memories having stored therein at least one piece of program code loaded and executed by the one or more processors to carry out the operations performed by the method according to any of the first aspects.
The one or more technical solutions provided by the embodiments of the present invention at least achieve the following technical effects or advantages:
The method comprises the steps of identifying the current output torque of a generator in the process of dragging the engine to start the generator, and controlling the engine to perform oil injection ignition when the rotating speed of the engine reaches a set oil injection rotating speed threshold if the current output torque of the generator is smaller than the set torque threshold, wherein the torque threshold is the minimum torque required by the generator to drag the rotating speed of the engine to the starting completion rotating speed, the oil injection rotating speed threshold is the initial rotating speed after the engine performs oil injection ignition, the oil injection rotating speed threshold is smaller than the initial oil injection rotating speed threshold, and the initial oil injection rotating speed threshold is the initial rotating speed before the engine performs oil injection ignition when the output torque of the generator is larger than or equal to the torque threshold. Therefore, when the output torque of the generator is limited, the engine is advanced to spray oil and ignite to increase the engine speed to the starting completion speed by reducing the oil spraying speed threshold value of the engine, so that the starting success rate of the engine can be increased when the output torque of the generator is limited, and the starting performance of the vehicle is further improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.
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. In the drawings:
FIG. 1 shows a flowchart of an engine start control method of an embodiment of the present application;
FIG. 2 is a graph showing the variation of rotational speed across a resonance rotational speed region when an engine according to an embodiment of the present application is driven;
FIG. 3 is a graph showing engine speed variation after power-on of the motor according to an embodiment of the present application;
fig. 4 shows a structural view of an engine start control device of an embodiment of the present application;
fig. 5 shows a schematic structural diagram of a computer system of a vehicle suitable for implementing an embodiment of the application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the application may be practiced without one or more of the specific details, or with other methods, components, devices, steps, etc. In other instances, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the application.
The block diagrams depicted in the figures are merely functional entities and do not necessarily correspond to physically separate entities. That is, the functional entities may be implemented in software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
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.
It should also be noted that the terms "first," "second," and the like in the description and claims of the present application and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the objects so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in other sequences than those illustrated or otherwise described.
With the technical development of the hybrid electric vehicle, the P1 motor replaces the function of a traditional starter, the P1 motor is positioned on a sun gear of a planetary gear set, an engine is positioned on a planet carrier, the transmission path from the P1 motor to the engine is a P1 motor-planet carrier-torque limiting shock absorber-engine, the P1 motor can enable the transmission efficiency of the engine to be high, the engine is assisted to start and stop, power assistance is provided for the engine, vehicle torque is improved, driving feeling is increased, and kinetic energy recovery is achieved. Therefore, the output torque capability of the P1 motor will affect whether the engine can be started successfully, when the torque of the P1 motor is limited, for example, the ambient temperature is low, which results in limited discharge power of the power battery, and thus, when the torque of the P1 motor is limited, the engine may not be dragged to the required target rotation speed quickly, which results in failure of starting the engine or a problem that the engine cannot be started for the first time and needs to be started for multiple times.
Based on the above, in order to improve the starting success rate of the engine, the embodiment of the application provides an engine starting control method, which can improve the starting success rate of the engine to a certain extent when the output torque of the generator is limited, thereby improving the starting performance of the vehicle.
An engine start control method according to an embodiment of the present application will be described below with reference to the specific drawings.
Referring to fig. 1, a flowchart of an engine start control method of an embodiment of the present application is shown.
According to a first aspect of the embodiment of the present application, an engine start control method is provided, which may be executed on a vehicle controller, and the method includes, but is not limited to, implementation from step S1 to step S2:
S1, identifying the current output torque of a generator in the process of dragging the engine to start by the generator;
It will be appreciated that when the ambient temperature is low, for example below-30 degrees, this will result in limited discharge power from the power cell and hence limited output torque from the generator powered by the power cell during engine start, and thus the current output torque from the generator can be identified during motoring of the engine by the generator to provide a data basis for subsequent adoption of different engine start control strategies.
For example, when the temperature Of the engine coolant is lower than a certain threshold, the SOC (State Of Charge) Of the power battery is lower than a certain threshold, or the discharge power Of the power battery is lower than a certain threshold, the current output torque Of the generator may be considered to be limited, wherein the threshold may be calibrated according to different vehicle-mounted products, and is not limited herein.
In the running process of the vehicle, due to measures such as temperature rise in the passenger cabin, the discharge power of the power battery, the temperature of engine coolant and the like are not influenced by low environmental temperature, and when the vehicle starts the vehicle in an in-situ state, the discharge power of the power battery, the temperature of the engine coolant is generally influenced by the low environmental temperature, so that the output torque capacity of the generator is influenced. Therefore, the main application scenario of the engine starting control method of the embodiment of the application is in the in-situ parking state.
In some embodiments of the application, based on the foregoing, the identifying the current output torque of the generator includes:
and if the vehicle is in the in-situ state, identifying the current output torque of the generator.
And S2, if the current output torque of the generator is smaller than a set torque threshold, controlling the engine to perform oil injection ignition when the rotating speed of the engine reaches a set oil injection rotating speed threshold, wherein the torque threshold is the minimum torque required by the generator to drag the rotating speed of the engine to a starting completion rotating speed, the oil injection rotating speed threshold is the initial rotating speed after the engine performs oil injection ignition, the oil injection rotating speed threshold is smaller than an initial oil injection rotating speed threshold, and the initial oil injection rotating speed threshold is the initial rotating speed before the engine performs oil injection ignition when the output torque of the generator is larger than or equal to the torque threshold.
It will be appreciated that the minimum torque (torque threshold) required by the generator to pull the engine speed to completion of the start is assumed to be 100 nm, i.e. the output torque of the generator should be greater than or equal to 100 nm to pull the engine to completion of the start. In the engine starting stage, the power battery discharges the generator, so that a corresponding relation exists between the discharge power of the power battery and the output torque of the generator, and whether the output torque of the generator can reach a torque threshold value or not can be also represented by the discharge power of the power battery.
If the discharge power of the power cell is not limited (e.g., greater than or equal to 15 kilowatts), the output torque of the generator can be greater than or equal to a torque threshold (e.g., 100 nm), and the generator drags the engine to a higher start-up completion speed (or idle speed). Under the general condition, after the engine reaches the starting completion rotating speed, oil injection ignition is performed, so that the working efficiency of the engine is higher, and the energy consumption is saved. The initial injection speed threshold may be the same as or different from (e.g., slightly greater than) the start-up completion speed, and in some embodiments, the same initial injection speed threshold as the start-up completion speed is employed, e.g., 1000rpm,800rpm,600rpm, etc.
If the discharging power of the power battery is limited (for example, less than 15 kw), so that the output torque of the generator is less than the torque threshold (for example, 100 nm), in this case, the generator can drag the engine to a certain rotation speed, for example, 500rpm,400rpm,300rpm, etc., but the engine cannot be dragged to the start-up completion rotation speed, for example, 1000rpm,800rpm,600rpm, etc., and the engine may fail to start due to the influence of environmental factors such as extremely low temperature, poor fuel atomization performance, etc.
On the basis of the above, when the output torque of the generator is identified to be limited, the embodiment of the application adopts a control strategy of reducing the oil injection speed threshold (namely, the oil injection speed threshold is smaller than the initial oil injection speed threshold, for example, the oil injection speed threshold is 1/2,2/3 of the initial oil injection speed threshold, and the like), and when the speed of the engine reaches the oil injection speed threshold (for example, 500rpm,400rpm,300 rpm), the engine is controlled to perform oil injection ignition in advance, so that the engine can reach the starting completion speed by utilizing the driving of the engine and the dragging of the generator, and the starting success rate of the engine can be improved when the output torque of the generator is limited, and the starting performance of a vehicle is further improved.
In some embodiments of the present application, based on the foregoing, the controlling the engine to perform fuel injection ignition includes:
S21, acquiring current atmospheric pressure and current cooling liquid temperature of the engine;
The current atmospheric pressure can be obtained through a vehicle-mounted air pressure sensor, and the current cooling liquid temperature of the engine can be obtained through a vehicle-mounted temperature sensor.
S22, determining target output torque corresponding to the engine according to the set corresponding relation, wherein the target output torque corresponds to the current atmospheric pressure and the current cooling liquid temperature;
In some embodiments of the present application, the determining the target output torque corresponding to the engine according to the set correspondence relationship and the current atmospheric pressure and the current coolant temperature includes:
s221, acquiring a set mapping relation table, wherein a plurality of air inflow amounts, and the atmospheric pressure and the cooling liquid temperature corresponding to each air inflow amount are recorded in the mapping relation table, and the cooling liquid temperature and the air inflow amount are in negative correlation;
For example, the table below shows the amounts of intake air corresponding to different coolant temperatures and different atmospheric pressures, and it is understood from the table that the lower the coolant temperature is, the larger the amount of intake air is, and the higher the coolant temperature is, the smaller the amount of intake air is.
S222, traversing the mapping relation table to determine target air inflow corresponding to the current atmospheric pressure and the current cooling liquid temperature;
for example, the current atmospheric pressure is 60KPa (kilopascals), the current coolant temperature is-30 ℃, the corresponding target air inflow is 3000 (m 3/h, cubic meters per hour), or the current atmospheric pressure is 75KPa, the current coolant temperature is-20 ℃, and the corresponding target air inflow is 727 (m 3/h).
And S223, determining the target output torque according to the set linear corresponding relation between the target air inflow and the target output torque.
It is understood that there is a linear correspondence between the target intake air amount and the target output torque, the larger the target intake air amount, the larger the target output torque. Then, as is clear from the above table, when the atmospheric pressure is constant, the lower the coolant temperature is, the larger the corresponding intake air amount is, and the larger the target output torque is.
And S23, controlling the engine to perform oil injection ignition so as to achieve the target output torque.
It can be understood that, because the cooling liquid temperature is in negative correlation with the air inflow, that is, the cooling liquid temperature is in negative correlation with the target output torque of the engine, then, in a low-temperature environment, the target output torque of the engine needs to be set to be larger, that is, the output torque of the engine can reach the larger target output torque as much as possible when the engine is subjected to oil injection ignition, so that the up-rush rotation speed of the engine in the starting stage is improved, the combustion chamber of the engine can be quickly heated, the combustion of the engine is facilitated, the successful probability of vehicle starting is improved, the safe and reliable starting of the vehicle is realized, and the problems of difficult starting or failed starting when the motor starting boosting torque is insufficient are solved.
It will be appreciated that during the engine start-up process, the coolant temperature, the atmospheric pressure, etc. may change, and then when the coolant temperature and the atmospheric pressure change, the corresponding air intake amount and the target output torque also need to be adjusted, so as to better conform to the actual environmental requirement of the engine, where the air intake amount may be represented by a start-up average effective pressure, and the average effective pressure determines the overshoot of the rotational speed during the start-up process.
In some embodiments, when controlling the engine to perform fuel injection ignition, the method further comprises:
judging the fuel control mode according to the running state of the engine, if the engine is in the starting process, the engine is in the starting fuel control state, and entering the fuel control state after starting after the starting is completed. During cold start, the temperature of the combustion chamber wall and the cylinder wall surface is low, and a large part of fuel injected by the fuel injector is deposited on the wall surface to form an oil film. In order to ensure the concentration of the combustible mixture entering the cylinder, the loss of fuel oil is compensated by increasing the fuel injection quantity. After the start-up is finished, the temperature of the combustion chamber gradually rises along with the ignition and combustion of the engine, the oil film loss gradually reduces, and the oil injection needs to be attenuated.
In some embodiments, when controlling the engine to perform fuel injection ignition, the method further comprises:
The ignition advance angle is set 5-13 degrees before compression top dead center.
It will be appreciated that the start-up firing angle of the engine is affected by factors such as engine coolant and the speed signal (the difference between the engine speed and the target speed). To facilitate engine start stabilization, the spark advance angle is typically set 5-13 ° before compression top dead center.
In some embodiments, after controlling the engine to perform fuel injection ignition, the method further comprises:
And controlling the generator to continuously drag the engine according to the current output torque so as to increase the rotating speed of the engine to the starting completion rotating speed based on the driving of the oil injection ignition of the engine and the dragging of the generator to the engine.
Thus, after the rotational speed of the engine reaches the fuel injection rotational speed threshold, the generator continues to drag the engine (for example, 100 nm, 50 nm and the like) according to the output torque which can be provided at present, and meanwhile, the engine is driven based on the fuel injection ignition of the engine, so that the rotational speed of the engine can be increased to the starting completion rotational speed more quickly.
In some embodiments, based on the foregoing, after controlling the engine to perform fuel injection ignition, the method further includes:
And S3, controlling the power battery to increase the discharge power within a preset time period, so that the current output torque of the generator is larger than the torque threshold value, and dragging the rotating speed of the engine to increase to a target rotating speed, wherein the target rotating speed is larger than the upper limit value of a resonance rotating speed interval of the engine and the hybrid gearbox.
For example, the original discharging power of the power battery is 5-10 kilowatts, and the power battery is controlled to carry out power borrowing (for example, the discharging power is increased to 15 kilowatts) to the generator in a short time within 2 seconds, so that the generator can quickly drag the engine to a target rotating speed, and the engine is prevented from staying in a resonance rotating speed interval to influence the NVH performance of the vehicle.
Referring to fig. 2, a graph of rotational speed variation across a resonance rotational speed region when an engine of an embodiment of the present application is driven is shown.
As can be seen in fig. 2, in the low temperature environment, the fuel atomization of the engine is poor, and in the case that the engine is not completely combusted and is accompanied by a fire, the generator continuously drags the engine (for example, the rotation speed of the engine is maintained at 300rpm,400rpm, etc.), and the starting drag rotation speed of the generator to the engine is in the assembly resonance rotation speed interval (for example, 300-450 rpm), so if the engine is continuously in the resonance rotation speed interval, the engine rotation speed is severely fluctuated, the gear at the joint of the engine and the generator shaft is impacted, gear rattle is generated, and the "bang bang" sound is obvious, thereby affecting the NVH (Noi se, vi brat ion, HARSHNESS, noise, vibration and harshness) performance of the vehicle and affecting the user experience.
In addition, if the engine performs oil injection ignition when the engine drags to the oil injection ignition rotation speed threshold (300 rpm) by the generator, when the engine starts to increase the engine rotation speed from the oil injection ignition rotation speed threshold to the starting completion rotation speed (600 rpm) by self oil injection ignition, the engine still passes through the resonance rotation speed interval and usually stays in the interval for a long time, for example, about 4 seconds, during which 4 seconds, the engine rotation speed severely fluctuates, the gear at the joint of the engine and the generator shaft collides, gear rattle is generated, the "bang bang" sound is obvious, the NVH (noise, vi brat i on, HARSHNESS, noise, vibration and harshness) performance of the vehicle is also influenced, and the user experience is influenced.
Referring to fig. 3, a graph of engine speed change after power-on of the motor according to an embodiment of the present application is shown.
As can be seen from fig. 3, when the torque of the motor is limited, the power battery is powered by the generator for a short time, for example, the power battery is powered up for a short time within 2 seconds, so that the rotating speed of the engine can be raised from the oil injection rotating speed threshold to the target rotating speed, for example, to 480 rpm.
In some embodiments, based on the foregoing solution, the controlling the power battery to increase the discharge power for a preset period of time includes:
s31, obtaining total output torque required by the generator to drag the engine to reach the target rotating speed from the oil injection rotating speed threshold;
for example, the threshold value of the oil injection speed is 300rpm, the target speed is 600rpm, the generator operates according to the output torque of 60 nm, and the total output torque required for dragging the engine from 300 to 600rpm is 300 nm.
S32, determining the total discharge power required by the power battery in the preset time period and the corresponding instantaneous discharge power in the unit time period according to the total output torque;
For example, when the total output torque is 300 nm, the total discharge power required by the power battery in 2 seconds is 30 kw, and the corresponding instantaneous discharge power per unit time (for example, 1 second) is 15 kw.
And S33, controlling the power battery to supply power to the generator according to the instantaneous discharge power.
For example, the power battery is controlled to supply the generator with 15 kilowatts of discharge power in 2 seconds.
Based on the disclosure, the embodiment of the disclosure adopts a control strategy for reducing the oil injection rotating speed threshold (namely, the oil injection rotating speed threshold is smaller than the initial oil injection rotating speed threshold) when the output torque of the generator is identified to be limited, controls the engine to perform oil injection ignition in advance when the rotating speed of the engine reaches the oil injection rotating speed threshold (such as 500rpm,400rpm and 300 rpm), so that the engine can reach the starting completion rotating speed by utilizing the driving of the engine and the dragging of the generator, the starting success rate of the engine can be improved when the output torque of the generator is limited, and the starting performance of a vehicle is improved.
Referring to fig. 4, a block diagram of an engine start control apparatus of an embodiment of the present application is shown.
According to a second aspect of the embodiment of the present application, there is provided an engine start control apparatus 200 including:
A recognition unit 201, configured to recognize a current output torque of a generator during a process of dragging an engine to start by the generator;
And the control unit 202 is configured to control the engine to perform oil injection and ignition when the rotation speed of the engine reaches a set oil injection rotation speed threshold if the current output torque of the generator is smaller than a set torque threshold, where the torque threshold is a minimum torque required by the generator to drag the rotation speed of the engine to a start-up completion rotation speed, the oil injection rotation speed threshold is a corrected start rotation speed corresponding to the oil injection and ignition of the engine, the oil injection rotation speed threshold is smaller than an initial oil injection rotation speed threshold, and the initial oil injection rotation speed threshold is a corrected start rotation speed corresponding to the oil injection and ignition of the engine when the output torque of the generator is greater than or equal to the torque threshold.
According to a third aspect of embodiments of the present application, there is provided a computer readable storage medium having stored therein at least one computer program instruction that is loaded and executed by a processor to implement the operations performed by the method as described in any of the first aspects.
The computer readable storage medium may take the form of a portable compact disc read only memory (CD-ROM) and include program code that can be run on a terminal device, such as a personal computer. However, the computer-readable storage medium of the present application is not limited thereto, and in the present application, the readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The readable storage medium can be, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of a readable storage medium include an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
Program code for carrying out operations of the present application may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device, partly on a remote computing device, or entirely on the remote computing device or server. In the case of remote computing devices, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., connected via the Internet using an Internet service provider).
According to a fourth aspect of embodiments of the present application there is provided a vehicle comprising one or more processors and one or more memories having stored therein at least one piece of program code loaded and executed by the one or more processors to carry out the operations performed by the method according to any of the first aspects.
Referring to fig. 5, a schematic diagram of a computer system suitable for use in a vehicle implementing an embodiment of the present application is shown.
According to a fourth aspect of embodiments of the present application there is provided a vehicle comprising one or more processors and one or more memories having stored therein at least one piece of program code loaded and executed by the one or more processors to carry out the operations performed by the method of any of the first aspects.
As shown in fig. 5, the vehicle 400 is embodied in the form of a general purpose computing device. The components of the vehicle 400 may include, but are not limited to, the at least one processing unit 410, the at least one memory unit 420, and a bus 430 that connects the various system components, including the memory unit 420 and the processing unit 410.
Wherein the storage unit stores program code that is executable by the processing unit 410 such that the processing unit 410 performs steps according to various exemplary embodiments of the present application described in the above-described "example methods" section of the present specification.
The storage unit 420 may include readable media in the form of volatile storage units, such as Random Access Memory (RAM) 421 and/or cache memory 422, and may further include Read Only Memory (ROM) 423.
The storage unit 420 may also include a program/utility 424 having a set (at least one) of program modules 425, such program modules 425 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment.
Bus 430 may be a local bus representing one or more of several types of bus structures including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or using any of a variety of bus architectures.
The vehicle 400 may also communicate with one or more external devices 500 (e.g., keyboard, pointing device, bluetooth device, etc.), one or more devices that enable a user to interact with the vehicle 400, and/or any device (e.g., router, modem, etc.) that enables the vehicle 400 to communicate with one or more other computing devices. Such communication may occur through an input/output (I/O) interface 450. Also, vehicle 400 may communicate with one or more networks such as a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the Internet, through network adapter 460. As shown, the network adapter 460 communicates with other modules of the vehicle 400 over the bus 430. It should be appreciated that although not shown, other hardware and/or software modules may be used in connection with vehicle 400 including, but not limited to, microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, data backup storage systems, and the like.
The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software that is executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope and spirit of the invention and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or a combination of any of these. In addition, each functional unit may be integrated in one processing unit, each unit may exist alone physically, or two or more units may be integrated in one unit.
In the several embodiments provided in the present application, it should be understood that the disclosed technology may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of units may be a logic function division, and there may be another division manner in actual implementation, for example, 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 through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate components may or may not be physically separate, and components as control devices may or may not be physical units, may be located in one place, or may be distributed over a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in essence or a part contributing to the prior art or all or 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 or a network device, etc.) to perform all or part of the steps of the method of the various embodiments of the present invention. The storage medium includes a U disk, a Read-only memory (ROM, read-On l yMemory), a random access memory (RAM, randomAccessMemory), a removable hard disk, a magnetic disk, or an optical disk, etc. which can store the program codes.
The above description is only an example of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. An engine start control method, characterized by comprising:
in the process that the generator drags the engine to start, the current output torque of the generator is identified;
And if the current output torque of the generator is smaller than a set torque threshold, controlling the engine to perform oil injection ignition when the rotating speed of the engine reaches a set oil injection rotating speed threshold, wherein the torque threshold is the minimum torque required by the generator to drag the rotating speed of the engine to a starting completion rotating speed, the oil injection rotating speed threshold is the corrected initial rotating speed corresponding to the oil injection ignition of the engine, the oil injection rotating speed threshold is smaller than an initial oil injection rotating speed threshold, and the initial oil injection rotating speed threshold is the initial rotating speed before the correction corresponding to the oil injection ignition of the engine when the output torque of the generator is larger than or equal to the torque threshold.
2. The method of claim 1, wherein said controlling said engine to fire fuel injection comprises:
acquiring current atmospheric pressure and current coolant temperature of the engine;
Determining a target output torque corresponding to the current atmospheric pressure and the current coolant temperature according to the set corresponding relation;
And controlling the engine to perform oil injection ignition so as to achieve the target output torque.
3. The method according to claim 2, wherein the determining a target output torque corresponding to the current atmospheric pressure and the current coolant temperature determination according to the set correspondence relation includes:
acquiring a set mapping relation table, wherein a plurality of air inflow amounts, and atmospheric pressure and cooling liquid temperature corresponding to each air inflow amount are recorded in the mapping relation table, wherein the cooling liquid temperature and the air inflow amount are in negative correlation;
traversing the mapping relation table to determine a target air inflow corresponding to the current atmospheric pressure and the current cooling liquid temperature;
and determining the target output torque according to the set linear corresponding relation between the target air inflow and the target output torque.
4. The method of claim 1, wherein after controlling the engine to perform fuel injection ignition, the method further comprises:
And controlling the generator to continuously drag the engine according to the current output torque so as to increase the rotating speed of the engine to the starting completion rotating speed based on the driving of the oil injection ignition of the engine and the dragging of the generator to the engine.
5. The method of claim 1, further comprising, after controlling the engine to perform fuel injection ignition:
And controlling the power battery to increase the discharge power within a preset time period, so that the current output torque of the generator is larger than the torque threshold value, and dragging the rotating speed of the engine to increase to a target rotating speed, wherein the target rotating speed is larger than the upper limit value of a resonance rotating speed interval of the engine and the hybrid gearbox.
6. The method of claim 5, wherein controlling the power cell to increase the discharge power for a predetermined period of time comprises:
Acquiring total output torque required by the generator to drag the engine to reach the target rotating speed from the oil injection rotating speed threshold;
determining the total discharge power required by the power battery in the preset time period and the corresponding instantaneous discharge power in the unit time period according to the total output torque;
and controlling the power battery to supply power to the generator according to the instantaneous discharge power.
7. The method of any of claims 1-6, wherein said identifying a current output torque of the generator comprises:
and if the vehicle is in the in-situ state, identifying the current output torque of the generator.
8. An engine start control device, comprising:
the identifying unit is used for identifying the current output torque of the generator in the process of dragging the engine to start by the generator;
And the control unit is used for controlling the engine to perform oil injection ignition when the rotating speed of the engine reaches a set oil injection rotating speed threshold value if the current output torque of the generator is smaller than the set torque threshold value, wherein the torque threshold value is the minimum torque required by the generator to drag the rotating speed of the engine to the starting completion rotating speed, the oil injection rotating speed threshold value is the initial rotating speed after the engine performs oil injection ignition corresponding correction, the oil injection rotating speed threshold value is smaller than the initial oil injection rotating speed threshold value, and the initial oil injection rotating speed threshold value is the initial rotating speed before the engine performs oil injection ignition corresponding correction when the output torque of the generator is larger than or equal to the torque threshold value.
9. A computer readable storage medium having stored therein at least one computer program instruction that is loaded and executed by a processor to implement operations performed by a method as claimed in any one of claims 1 to 7.
10. A vehicle comprising one or more processors and one or more memories having stored therein at least one piece of program code loaded and executed by the one or more processors to implement the operations performed by the method of any of claims 1-7.
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| CN202411301461.2A CN119177906B (en) | 2024-09-18 | 2024-09-18 | Vehicle, engine start control method, device and medium |
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