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CN120819447A - Engine control method, device, computer-readable storage medium, and vehicle - Google Patents

Engine control method, device, computer-readable storage medium, and vehicle

Info

Publication number
CN120819447A
CN120819447A CN202511328864.0A CN202511328864A CN120819447A CN 120819447 A CN120819447 A CN 120819447A CN 202511328864 A CN202511328864 A CN 202511328864A CN 120819447 A CN120819447 A CN 120819447A
Authority
CN
China
Prior art keywords
engine
opening
pressure
intake manifold
throttle valve
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CN202511328864.0A
Other languages
Chinese (zh)
Other versions
CN120819447B (en
Inventor
李卫
席时文
莫文超
臧运峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weichai Power Co Ltd
Original Assignee
Weichai Power 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 Weichai Power Co Ltd filed Critical Weichai Power Co Ltd
Priority to CN202511328864.0A priority Critical patent/CN120819447B/en
Publication of CN120819447A publication Critical patent/CN120819447A/en
Application granted granted Critical
Publication of CN120819447B publication Critical patent/CN120819447B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • F02D41/0002—Controlling intake air
    • 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
    • F02D41/08—Introducing corrections for particular operating conditions for idling
    • 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
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • 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
    • F02P5/045—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions combined with electronic control of other engine functions, e.g. fuel injection
    • 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
    • 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
    • F02D41/0002—Controlling intake air
    • F02D2041/0022—Controlling intake air for diesel engines by throttle control
    • 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
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1409—Introducing closed-loop corrections characterised by the control or regulation method using at least a proportional, integral or derivative controller
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0406—Intake manifold pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0414—Air temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/32—Air-fuel ratio control in a diesel engine
    • 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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

The application provides a control method, a device, a computer readable storage medium and a vehicle of an engine, wherein the method comprises the steps of respectively adjusting the opening of an exhaust gas recirculation valve of the engine and the opening of a throttle valve of the engine to corresponding preset opening under the condition that the engine is in an idle working condition, and the idle working condition is the working condition that the engine runs without load; and under the condition that the pressure of the air inlet manifold is smaller than or equal to a pressure threshold value, increasing the opening of the exhaust gas recirculation valve and increasing the opening of the throttle valve to ensure that the pressure of the air inlet manifold is larger than the pressure threshold value, thereby solving the problem of high engine oil consumption caused by pumping engine oil due to low pressure of the air inlet manifold under the idle working condition of the engine in the prior art.

Description

Engine control method, engine control device, computer readable storage medium, and vehicle
Technical Field
The present application relates to the field of engine control technology, and in particular, to an engine control method, an engine control device, a computer readable storage medium, and a vehicle.
Background
When the engine is in an idle working state, the vacuum degree in the air inlet pipe is large, so that the pressure inside and outside the crankcase is unbalanced, and engine oil in the crankcase can be sucked into the pressure stabilizing cavity of the air inlet manifold to deposit, thereby causing ineffective loss of the engine oil and causing high engine oil consumption.
Disclosure of Invention
The application mainly aims to provide an engine control method, an engine control device, a computer readable storage medium and a vehicle, which at least solve the problem of high engine oil consumption caused by engine oil pumping due to low pressure of an intake manifold under an idle working condition of an engine in the prior art.
In order to achieve the above object, according to one aspect of the present application, there is provided a control method of an engine, including adjusting an opening degree of an exhaust gas recirculation valve of the engine and an opening degree of a throttle valve of the engine to respective predetermined opening degrees in a case where the engine is in an idle operation, the idle operation being an operation in which the engine is operated without load, acquiring a pressure of an intake manifold of the engine after adjusting the opening degree of the exhaust gas recirculation valve and the opening degree of the throttle valve to the respective predetermined opening degrees, and increasing the opening degree of the exhaust gas recirculation valve and the opening degree of the throttle valve in a case where the pressure of the intake manifold is less than or equal to a pressure threshold value so that the pressure of the intake manifold is greater than the pressure threshold value.
Optionally, increasing the opening of the exhaust gas recirculation valve and increasing the opening of the throttle valve when the pressure of the intake manifold is less than or equal to a pressure threshold, such that the pressure of the intake manifold is greater than the pressure threshold, comprises obtaining the current ambient temperature at the current time when the pressure of the intake manifold is less than or equal to the pressure threshold, obtaining the current ambient temperature, not adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle valve when the current ambient temperature is less than a temperature threshold, and increasing the opening of the exhaust gas recirculation valve and increasing the opening of the throttle valve when the current ambient temperature is greater than or equal to the temperature threshold, such that the pressure of the intake manifold is greater than the pressure threshold.
Optionally, increasing the opening of the EGR valve and increasing the opening of the throttle valve so that the pressure of the intake manifold is greater than the pressure threshold includes a first control step of controlling the opening of the EGR valve to increase by a first opening, an acquisition step of acquiring the oxygen content of the mixture of the intake manifold, a second control step of controlling the opening of the throttle valve to increase by a second opening so that the oxygen content of the mixture of the intake manifold is greater than or equal to the oxygen content threshold if the oxygen content of the mixture of the intake manifold is less than the oxygen content threshold, and repeating the first control step, the acquisition step, and the second control step at least once in sequence until the pressure of the intake manifold is greater than the pressure threshold.
The method comprises the steps of obtaining the preset opening of an exhaust gas recirculation valve of an engine under an idle working condition, obtaining a first preset opening, obtaining a second preset opening, obtaining a preset ignition advance angle of the idle working condition, PID adjusting the opening of the exhaust gas recirculation valve until the opening of the exhaust gas recirculation valve is equal to the first preset opening, PID adjusting the opening of the throttle until the opening of the throttle is equal to the second preset opening, and PID adjusting the ignition advance angle of the engine until the ignition advance angle is equal to the preset ignition advance angle.
Optionally, after adjusting the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle valve of the engine to the corresponding predetermined openings, respectively, before acquiring the pressure of the intake manifold of the engine, the method further comprises acquiring a stoichiometric air-fuel ratio for the idle condition, and adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle valve so that the actual air-fuel ratio is equal to the stoichiometric air-fuel ratio with the fuel injection amount of the engine kept unchanged.
Optionally, after acquiring the pressure of the intake manifold of the engine, the method further comprises controlling the opening of the EGR valve and the opening of the throttle valve to remain unchanged in the case where the pressure of the intake manifold is greater than the pressure threshold.
Optionally, before the opening of an exhaust gas recirculation valve of the engine and the opening of a throttle valve of the engine are respectively adjusted to corresponding preset openings under the condition that the engine is in an idle working condition, the method further comprises the steps of obtaining operation parameters of a vehicle to which the engine belongs, wherein the operation parameters comprise a gear, an engine rotating speed and an accelerator opening, and determining that the engine is in the idle working condition under the condition that a first condition or a second condition is met, wherein the first condition is that the gear is a neutral gear and the engine rotating speed is not equal to zero, and the second condition is that the accelerator opening is equal to zero and the engine rotating speed is not equal to zero.
According to another aspect of the present application, there is provided a control device of an engine, including a first adjustment unit configured to adjust an opening of an exhaust gas recirculation valve of the engine and an opening of a throttle valve of the engine to respective predetermined openings when the engine is in an idle operation, the idle operation being an operation in which the engine is operated without load, a first acquisition unit configured to acquire a pressure of an intake manifold of the engine after adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle valve to respective predetermined openings, respectively, and a second adjustment unit configured to increase the opening of the exhaust gas recirculation valve and the opening of the throttle valve such that the pressure of the intake manifold is greater than the pressure threshold when the pressure of the intake manifold is less than or equal to the pressure threshold.
According to still another aspect of the present application, there is provided a computer-readable storage medium including a stored program, wherein the program, when run, controls a device in which the computer-readable storage medium is located to execute any one of the control methods of the engine.
According to yet another aspect of the present application, there is provided a vehicle including an engine, one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including a control method for executing any one of the engines.
By applying the technical scheme of the application, in the control method of the engine, the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle valve of the engine are respectively adjusted to the corresponding preset opening under the idle working condition of the engine, the pressure of the air inlet manifold of the engine at the moment is detected, if the pressure of the air inlet manifold is smaller than or equal to the pressure threshold value, the phenomenon of pumping engine oil can occur when the vacuum degree of the air inlet manifold is larger, the opening of the exhaust gas recirculation valve is increased, and the opening of the throttle valve is increased, so that the pressure of the air inlet manifold is larger than the pressure threshold value, the engine oil pumping can be avoided, the oil consumption of the engine oil is greatly reduced, and the problem of high engine oil consumption caused by engine oil pumping due to low pressure of the air inlet manifold in the idle working condition of the engine in the prior art is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
fig. 1 is a block diagram showing a hardware configuration of a mobile terminal performing a control method of an engine according to an embodiment of the present application;
FIG. 2 illustrates a flow diagram of a method of controlling an engine according to an embodiment of the present disclosure;
FIG. 3 illustrates a flow diagram for EGR valve icing detection provided in accordance with an embodiment of the present application;
fig. 4 shows a schematic flow chart for adjusting the opening of the EGR valve and the opening of the throttle valve according to the embodiment of the present application;
FIG. 5 illustrates a flow diagram of another engine control method provided in accordance with an embodiment of the present disclosure;
fig. 6 shows a block diagram of a control apparatus of an engine according to an embodiment of the present application.
Wherein the above figures include the following reference numerals:
102. Processor 104, memory 106, transmission equipment 108, input and output equipment 10, first adjusting unit 20, first obtaining unit 30 and second adjusting unit.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above 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 data so used may be interchanged where appropriate in order to describe the embodiments of the application herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
For convenience of description, the following will describe some terms or terminology involved in the embodiments of the present application:
EGR valve, i.e., exhaust gas recirculation valve, for regulating the flow of recirculated exhaust gas.
PID, i.e., proportional-integral-derivative controller.
ECU, i.e. an electronic control unit.
As described in the background art, in order to solve the problem that the engine oil consumption generated by pumping engine oil is high due to low intake manifold pressure under the idle condition of the engine in the prior art, embodiments of the present application provide an engine control method, apparatus, computer readable storage medium and vehicle.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The method embodiments provided in the embodiments of the present application may be performed in a mobile terminal, a computer terminal or similar computing device. Taking a mobile terminal as an example, fig. 1 is a block diagram of a hardware structure of the mobile terminal according to a control method of an engine according to an embodiment of the present application. As shown in fig. 1, a mobile terminal may include one or more (only one is shown in fig. 1) processors 102 (the processor 102 may include, but is not limited to, a microprocessor MCU or a processing device such as a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 for communication functions and an input-output device 108. It will be appreciated by those skilled in the art that the structure shown in fig. 1 is merely illustrative and not limiting of the structure of the mobile terminal described above. For example, the mobile terminal may also include more or fewer components than shown in fig. 1, or have a different configuration than shown in fig. 1.
The memory 104 may be used to store a computer program, for example, a software program of application software and a module, such as a computer program corresponding to a control method of an engine in an embodiment of the present invention, and the processor 102 executes the computer program stored in the memory 104 to perform various functional applications and data processing, that is, to implement the above-mentioned method. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory remotely located relative to the processor 102, which may be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or transmit data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, simply referred to as a NIC) that can connect to other network devices through a base station to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module, which is configured to communicate with the internet wirelessly.
In the present embodiment, a control method of an engine operating on a mobile terminal, a computer terminal, or a similar computing device is provided, it is to be noted that the steps shown in the flowcharts of the drawings may be executed in a computer system such as a set of computer executable instructions, and that although a logical order is shown in the flowcharts, in some cases, the steps shown or described may be executed in an order different from that shown or described herein.
Fig. 2 is a flowchart of a control method of an engine according to an embodiment of the present application. As shown in fig. 2, the method comprises the steps of:
Step S201, when the engine is in an idle working condition, the opening degree of an exhaust gas recirculation valve of the engine and the opening degree of a throttle valve of the engine are respectively adjusted to corresponding preset opening degrees, wherein the idle working condition is a working condition of no-load operation of the engine;
specifically, different control logics are adopted when the engine is in different modes in the engine electronic control data, for example, when the engine is in an idle mode, the engine can perform idle speed control PID to adjust the pressure of an air inlet manifold, the EGR rate and the ignition advance angle according to the electronic control data setting so as to adapt to idle speed working conditions, wherein the EGR rate is the opening degree of an exhaust gas recirculation valve, and the opening degree of a throttle valve is adjusted so as to realize the adjustment of the pressure of the air inlet manifold.
Step S202, after adjusting the opening degree of the EGR valve and the opening degree of the throttle valve to the corresponding preset opening degrees respectively, acquiring the pressure of an intake manifold of the engine;
Specifically, after the opening of the EGR valve of the engine and the opening of the throttle valve of the engine are respectively adjusted to the corresponding predetermined opening, the engine is stably operated under an idle condition, and then the pressure of the intake manifold of the engine is obtained to determine whether a negative pressure occurs in the intake manifold under the idle condition.
Step S203 of increasing the opening degree of the EGR valve and increasing the opening degree of the throttle valve so that the pressure of the intake manifold is greater than the pressure threshold value when the pressure of the intake manifold is less than or equal to the pressure threshold value.
Specifically, when the pressure of the intake manifold is less than or equal to the pressure threshold, it indicates whether the intake manifold has negative pressure and a larger vacuum degree under the idle working condition, and a phenomenon of pumping oil occurs, so that the opening of the EGR valve is increased and the opening of the throttle valve is increased to increase the pressure of the intake manifold, so that the pressure of the intake manifold is greater than the pressure threshold, and the phenomenon of pumping oil is avoided.
According to the control method of the engine, in the control method of the engine, the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle valve of the engine are respectively adjusted to the corresponding preset opening under the idle working condition of the engine, the pressure of the air inlet manifold of the engine at the moment is detected, if the pressure of the air inlet manifold is smaller than or equal to the pressure threshold value, the phenomenon of pumping engine oil can occur when the vacuum degree of the air inlet manifold is larger, the opening of the exhaust gas recirculation valve is increased, the opening of the throttle valve is increased, the pressure of the air inlet manifold is enabled to be larger than the pressure threshold value, engine oil pumping can be avoided, oil consumption of engine oil is greatly reduced, and the problem that engine oil pumping is high due to low pressure of the air inlet manifold in the idle working condition of the engine in the prior art is solved.
In order to prevent the EGR valve from malfunctioning, in an alternative embodiment, as shown in fig. 3, the step S203 includes:
step S2031, obtaining an ambient temperature at a current time and obtaining the current ambient temperature when the pressure of the intake manifold is less than or equal to a pressure threshold;
step S2032 of not adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle valve in the case where the current environmental temperature is less than the temperature threshold;
Step S2033, when the current ambient temperature is equal to or higher than the temperature threshold, of increasing the opening degree of the exhaust gas recirculation valve and increasing the opening degree of the throttle valve so that the pressure of the intake manifold is higher than the pressure threshold.
In the above embodiment, when the pressure of the intake manifold is equal to or lower than the pressure threshold value, it is necessary to increase the opening degree of the EGR valve, but since the EGR valve is frozen due to a low ambient temperature and the EGR valve is damaged by continuing the adjustment, when the current ambient temperature is lower than the temperature threshold value, the opening degree of the EGR valve and the opening degree of the throttle valve are not adjusted to prevent the EGR valve from malfunctioning, and when the current ambient temperature is equal to or higher than the temperature threshold value, the EGR valve is not frozen, and the opening degree of the EGR valve is increased and the opening degree of the throttle valve is increased to make the pressure of the intake manifold higher than the pressure threshold value.
In order to ensure that the fuel is burned again, in an alternative embodiment, as shown in fig. 4, the step S203 further includes:
Step S2034, a first control step of controlling the opening degree of the exhaust gas recirculation valve to increase by a first opening degree;
step S2035, obtaining an oxygen content of the mixture of the intake manifold;
Step S2036, a second control step of controlling the opening degree of the throttle valve to increase a second opening degree so that the oxygen content of the air-fuel mixture of the intake manifold is greater than or equal to the oxygen content threshold value, when the oxygen content of the air-fuel mixture of the intake manifold is less than the oxygen content threshold value;
Step S2037, repeating the first control step, the obtaining step, and the second control step at least once in sequence until the pressure of the intake manifold is greater than the pressure threshold.
In the above embodiment, the control of the opening of the EGR valve to increase the first opening may cause the problem of insufficient combustion due to the decrease in the oxygen content in the mixture of the intake manifold, so that when the oxygen content in the mixture of the intake manifold is less than the oxygen content threshold, the control of the opening of the throttle valve to increase the second opening increases the air flow to increase the oxygen content in the mixture of the intake manifold, thereby increasing the pressure of the intake manifold, ensuring that the oxygen content in the mixture of the intake manifold is not decreased, ensuring that the fuel is burned again sufficiently, preventing the increase in fuel consumption, and facilitating the treatment of exhaust gas.
In order to ensure that the engine stably operates under the idle condition, in an alternative embodiment, the step S201 includes:
Step S2011, obtaining the preset opening degree of the exhaust gas recirculation valve under the idle working condition to obtain a first preset opening degree, obtaining the preset opening degree of the throttle valve under the idle working condition to obtain a second preset opening degree, and obtaining a preset ignition advance angle of the idle working condition;
step S2012, performing PID adjustment on the opening of the egr valve until the opening of the egr valve is equal to the first predetermined opening, performing PID adjustment on the opening of the throttle valve until the opening of the throttle valve is equal to the second predetermined opening, and performing PID adjustment on the ignition advance angle of the engine until the ignition advance angle is equal to the predetermined ignition advance angle.
In the above embodiment, the engine may perform PID adjustment on the opening of the EGR valve according to a first predetermined opening, perform PID adjustment on the opening of the throttle valve according to a second predetermined opening, and prevent the engine from running in an idle condition due to excessively fast opening adjustment until the opening of the EGR valve is equal to the first predetermined opening and the opening of the throttle valve is equal to the second predetermined opening, for example, excessively large fluctuation in rotational speed, and perform PID adjustment on the ignition advance angle of the engine until the ignition advance angle is equal to the predetermined ignition advance angle, thereby preventing engine knocking and ensuring stable running of the engine in the idle condition.
In order to ensure that the engine stably operates under the idle working condition, in an alternative embodiment, after adjusting the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle valve of the engine to corresponding predetermined openings respectively, before acquiring the pressure of the intake manifold of the engine, the method further includes:
step S301, obtaining the theoretical air-fuel ratio of the idle working condition;
step S302 of adjusting the opening degree of the exhaust gas recirculation valve and the opening degree of the throttle valve so that the actual air-fuel ratio becomes equal to the stoichiometric air-fuel ratio while the fuel injection amount of the engine remains unchanged.
In the above embodiment, the intake manifold pressure is increased under the control of the stoichiometric air-fuel ratio, and the opening of the exhaust gas recirculation valve and the opening of the throttle valve are adjusted so that the actual air-fuel ratio is equal to the stoichiometric air-fuel ratio, and the unstable idle speed or the flameout caused by unstable idle speed or too slow combustion is prevented, thereby ensuring the stable operation of the engine under the idle working condition.
In order to save fuel consumption, in an alternative embodiment, after acquiring the pressure of the intake manifold of the engine, the method further includes:
In step S401, when the pressure of the intake manifold is greater than the pressure threshold, the opening degree of the exhaust gas recirculation valve and the opening degree of the throttle valve are controlled to be constant.
In the above embodiment, the increase in the opening of the egr valve and the opening of the throttle valve may cause an increase in the fuel injection amount to ensure the air-fuel ratio, and when the pressure of the intake manifold is greater than the pressure threshold, the opening of the egr valve and the opening of the throttle valve are controlled to be constant, so that the fuel injection amount is not increased any more, the fuel consumption is reduced, and the idle operation is prevented from being unstable due to an excessive increase in the rotation speed.
In order to determine whether the engine is in an idle condition, in an alternative embodiment, before adjusting the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle valve of the engine to corresponding predetermined openings respectively when the engine is in the idle condition, the method further includes:
step S501, obtaining operation parameters of a vehicle to which an engine belongs, wherein the operation parameters comprise a gear, an engine rotating speed and an accelerator opening;
Step S502 is executed to determine that the engine is in the idle operation condition when a first condition or a second condition is satisfied, the first condition being that the gear is neutral and the engine speed is not equal to zero, and the second condition being that the accelerator opening is equal to zero and the engine speed is not equal to zero.
In the above embodiment, there are two idle conditions, the first, the gear is neutral and the engine speed is not equal to zero, the engine is in the idle condition, the second, the accelerator opening is equal to zero and the engine speed is not equal to zero, the engine is in the idle condition, so as to accurately determine whether the engine is in the idle condition.
In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of the control method of the engine of the present application will be described in detail with reference to specific embodiments.
The embodiment relates to a specific engine control method, as shown in fig. 5, including the following steps:
step S1, acquiring engine operation data and determining that the engine is in an idle operation mode, wherein different control logics are adopted when the engine is in different modes in the engine electronic control data, for example, when the engine is in the idle operation mode, the engine can perform idle speed control PID to adjust the pressure of an air inlet manifold, the EGR rate and the ignition advance angle according to the electronic control data.
And step S2, determining that the current engine runs normally, and acquiring current environmental temperature parameters, wherein the current engine is determined to run normally, and signal acquisition is performed through the ECU and the environmental temperature sensor.
And step S3, comparing the actual environmental temperature value with an environmental temperature threshold value in the electronic control data setting based on the actual environmental temperature value when the current engine is running, and if the actual environmental temperature value is higher, calibrating and adjusting the opening of the EGR valve, wherein the calibrating and adjusting the opening of the EGR valve is to open the EGR valve, improve the exhaust gas flow of the EGR valve, adjust the opening of the electronic throttle valve, and improve the pressure of the intake manifold under the control of the theoretical air-fuel ratio. And if the actual ambient temperature value is lower than the ambient temperature threshold value in the electronic control data setting, calibrating and adjusting the opening of the EGR valve and the electronic throttle valve is not carried out.
And S4, controlling the opening of the EGR valve so that the pressure value of the intake manifold is larger than 30kPa, wherein if the pressure of the intake manifold is monitored to be lower than 30kPa, the opening of the EGR valve and the electronic throttle valve are continuously increased until the pressure of the intake manifold meets the requirement of being larger than 30kPa, then stopping adjusting the opening of the EGR valve and the electronic throttle valve, and keeping the opening of the EGR valve and the electronic throttle valve at the position.
The embodiment of the application also provides a control device of the engine, and the control device of the engine can be used for executing the control method for the engine. The device is used for realizing the above embodiments and preferred embodiments, and is not described in detail. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.
The following describes a control device of an engine provided by an embodiment of the present application.
Fig. 6 is a schematic diagram of a control device of an engine according to an embodiment of the present application. As shown in fig. 6, the apparatus includes:
A first adjusting unit 10, configured to adjust an opening of an exhaust gas recirculation valve of the engine and an opening of a throttle valve of the engine to respective predetermined openings when the engine is in an idle condition, where the idle condition is a condition in which the engine is operated without load;
specifically, different control logics are adopted when the engine is in different modes in the engine electronic control data, for example, when the engine is in an idle mode, the engine can perform idle speed control PID to adjust the pressure of an air inlet manifold, the EGR rate and the ignition advance angle according to the electronic control data setting so as to adapt to idle speed working conditions, wherein the EGR rate is the opening degree of an exhaust gas recirculation valve, and the opening degree of a throttle valve is adjusted so as to realize the adjustment of the pressure of the air inlet manifold.
A first acquisition unit 20 for acquiring a pressure of an intake manifold of the engine after adjusting an opening degree of the exhaust gas recirculation valve and an opening degree of the throttle valve to the respective predetermined opening degrees;
Specifically, after the opening of the EGR valve of the engine and the opening of the throttle valve of the engine are respectively adjusted to the corresponding predetermined opening, the engine is stably operated under an idle condition, and then the pressure of the intake manifold of the engine is obtained to determine whether a negative pressure occurs in the intake manifold under the idle condition.
And a second adjusting unit 30 configured to increase the opening degree of the exhaust gas recirculation valve and increase the opening degree of the throttle valve so that the pressure of the intake manifold is greater than the pressure threshold value, when the pressure of the intake manifold is less than or equal to the pressure threshold value.
Specifically, when the pressure of the intake manifold is less than or equal to the pressure threshold, it indicates whether the intake manifold has negative pressure and a larger vacuum degree under the idle working condition, and a phenomenon of pumping oil occurs, so that the opening of the EGR valve is increased and the opening of the throttle valve is increased to increase the pressure of the intake manifold, so that the pressure of the intake manifold is greater than the pressure threshold, and the phenomenon of pumping oil is avoided.
According to the control device of the engine, in the control device of the engine, the engine is in the idle working condition, the first adjusting unit respectively adjusts the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle valve of the engine to the corresponding preset opening, the first obtaining unit obtains the pressure of the air inlet manifold of the engine at the moment, if the pressure of the air inlet manifold is smaller than or equal to the pressure threshold value, the phenomenon of pumping engine oil can occur when the vacuum degree of the air inlet manifold is larger, the second adjusting unit increases the opening of the exhaust gas recirculation valve and increases the opening of the throttle valve, so that the pressure of the air inlet manifold is larger than the pressure threshold value, the engine oil pumping can be avoided, the oil consumption of engine oil is greatly reduced, and the problem of high engine oil consumption caused by engine oil pumping due to low pressure of the air inlet manifold in the idle working condition of the engine in the prior art is solved.
In order to prevent the malfunction of the EGR valve, in an alternative embodiment, as shown in fig. 3, the second adjusting unit includes:
The first acquisition module is used for acquiring the ambient temperature at the current moment to obtain the current ambient temperature under the condition that the pressure of the air inlet manifold is smaller than or equal to a pressure threshold value;
A first adjustment module configured to not adjust an opening degree of the exhaust gas recirculation valve and an opening degree of the throttle valve in a case where the current ambient temperature is less than a temperature threshold value;
And a second adjustment module configured to increase an opening degree of the exhaust gas recirculation valve and increase an opening degree of the throttle valve such that a pressure of the intake manifold is greater than the pressure threshold value, in a case where the current ambient temperature is greater than or equal to the temperature threshold value.
In the above embodiment, when the pressure of the intake manifold is equal to or lower than the pressure threshold value, it is necessary to increase the opening degree of the EGR valve, but since the EGR valve is frozen due to a low ambient temperature and the EGR valve is damaged by continuing the adjustment, when the current ambient temperature is lower than the temperature threshold value, the opening degree of the EGR valve and the opening degree of the throttle valve are not adjusted to prevent the EGR valve from malfunctioning, and when the current ambient temperature is equal to or higher than the temperature threshold value, the EGR valve is not frozen, and the opening degree of the EGR valve is increased and the opening degree of the throttle valve is increased to make the pressure of the intake manifold higher than the pressure threshold value.
In order to ensure that the fuel burns again, in an alternative embodiment, as shown in fig. 4, the second adjusting unit further includes:
A first control module for executing a first control step to control the opening of the exhaust gas recirculation valve to increase by a first opening;
the second acquisition module is used for executing the acquisition step and acquiring the oxygen content of the mixed gas of the air inlet manifold;
a second control module, configured to execute a second control step, and control the opening of the throttle valve to increase by a second opening when the oxygen content of the air-fuel mixture in the intake manifold is less than an oxygen content threshold value, so that the oxygen content of the air-fuel mixture in the intake manifold is greater than or equal to the oxygen content threshold value;
and a repeating module configured to sequentially repeat the first control step, the obtaining step, and the second control step at least once until the pressure of the intake manifold is greater than the pressure threshold.
In the above embodiment, the control of the opening of the EGR valve to increase the first opening may cause the problem of insufficient combustion due to the decrease in the oxygen content in the mixture of the intake manifold, so that when the oxygen content in the mixture of the intake manifold is less than the oxygen content threshold, the control of the opening of the throttle valve to increase the second opening increases the air flow to increase the oxygen content in the mixture of the intake manifold, thereby increasing the pressure of the intake manifold, ensuring that the oxygen content in the mixture of the intake manifold is not decreased, ensuring that the fuel is burned again sufficiently, preventing the increase in fuel consumption, and facilitating the treatment of exhaust gas.
In order to ensure stable operation of the engine under idle conditions, in an alternative embodiment, the first adjusting unit includes:
The third acquisition module is used for acquiring the preset opening degree of the exhaust gas recirculation valve under the idle working condition to obtain a first preset opening degree, acquiring the preset opening degree of the throttle valve under the idle working condition to obtain a second preset opening degree and acquiring a preset ignition advance angle of the idle working condition;
And a third adjusting module, configured to perform PID adjustment on the opening of the egr valve until the opening of the egr valve is equal to the first predetermined opening, perform PID adjustment on the opening of the throttle valve until the opening of the throttle valve is equal to the second predetermined opening, and perform PID adjustment on the ignition advance angle of the engine until the ignition advance angle is equal to the predetermined ignition advance angle.
In the above embodiment, the engine may perform PID adjustment on the opening of the EGR valve according to a first predetermined opening, perform PID adjustment on the opening of the throttle valve according to a second predetermined opening, and prevent the engine from running in an idle condition due to excessively fast opening adjustment until the opening of the EGR valve is equal to the first predetermined opening and the opening of the throttle valve is equal to the second predetermined opening, for example, excessively large fluctuation in rotational speed, and perform PID adjustment on the ignition advance angle of the engine until the ignition advance angle is equal to the predetermined ignition advance angle, thereby preventing engine knocking and ensuring stable running of the engine in the idle condition.
In order to ensure stable operation of the engine under idle conditions, in an alternative embodiment, the apparatus further comprises:
An acquisition module configured to acquire a stoichiometric air-fuel ratio for the idle condition before acquiring a pressure of an intake manifold of the engine after adjusting an opening degree of an exhaust gas recirculation valve of the engine and an opening degree of a throttle valve of the engine to respective corresponding predetermined opening degrees;
And a fourth adjustment module configured to adjust an opening degree of the exhaust gas recirculation valve and an opening degree of the throttle valve so that an actual air-fuel ratio is equal to the stoichiometric air-fuel ratio, while an injection amount of the engine remains unchanged.
In the above embodiment, the intake manifold pressure is increased under the control of the stoichiometric air-fuel ratio, and the opening of the exhaust gas recirculation valve and the opening of the throttle valve are adjusted so that the actual air-fuel ratio is equal to the stoichiometric air-fuel ratio, and the unstable idle speed or the flameout caused by unstable idle speed or too slow combustion is prevented, thereby ensuring the stable operation of the engine under the idle working condition.
In order to save fuel consumption, in an alternative embodiment, the above device further includes:
And a control unit configured to control an opening degree of the exhaust gas recirculation valve and an opening degree of the throttle valve to be kept unchanged when the pressure of the intake manifold is greater than the pressure threshold value after the pressure of the intake manifold of the engine is acquired.
In the above embodiment, the increase in the opening of the egr valve and the opening of the throttle valve may cause an increase in the fuel injection amount to ensure the air-fuel ratio, and when the pressure of the intake manifold is greater than the pressure threshold, the opening of the egr valve and the opening of the throttle valve are controlled to be constant, so that the fuel injection amount is not increased any more, the fuel consumption is reduced, and the idle operation is prevented from being unstable due to an excessive increase in the rotation speed.
In order to determine whether the engine is in idle operation, in an alternative embodiment, the apparatus further comprises:
the second acquisition unit is used for acquiring operation parameters of a vehicle to which the engine belongs before the opening of an exhaust gas recirculation valve of the engine and the opening of a throttle valve of the engine are respectively adjusted to corresponding preset openings under the condition that the engine is in an idle working condition, wherein the operation parameters comprise a gear, an engine rotating speed and an accelerator opening;
And a determining unit configured to determine that the engine is in the idle operation condition when a first condition or a second condition is satisfied, the first condition being that the gear is neutral and the engine speed is not equal to zero, the second condition being that the accelerator opening is equal to zero and the engine speed is not equal to zero.
In the above embodiment, there are two idle conditions, the first, the gear is neutral and the engine speed is not equal to zero, the engine is in the idle condition, the second, the accelerator opening is equal to zero and the engine speed is not equal to zero, the engine is in the idle condition, so as to accurately determine whether the engine is in the idle condition.
The control device of the engine comprises a processor and a memory, wherein the first adjusting unit, the first acquiring unit, the second adjusting unit and the like are all stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions. The modules are all located in the same processor, or the modules are respectively located in different processors in any combination.
The processor includes a kernel, and the kernel fetches the corresponding program unit from the memory. The inner core can be provided with one or more than one, and the problem of high engine oil consumption caused by engine oil pumping due to low pressure of an intake manifold under an idle working condition of an engine in the prior art is solved by adjusting parameters of the inner core.
The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.
The embodiment of the invention provides a computer readable storage medium, which comprises a stored program, wherein the program is used for controlling equipment where the computer readable storage medium is positioned to execute the control method of the engine.
Specifically, the control method of the engine includes:
Step S201, when the engine is in an idle working condition, the opening degree of an exhaust gas recirculation valve of the engine and the opening degree of a throttle valve of the engine are respectively adjusted to corresponding preset opening degrees, wherein the idle working condition is a working condition of no-load operation of the engine;
specifically, different control logics are adopted when the engine is in different modes in the engine electronic control data, for example, when the engine is in an idle mode, the engine can perform idle speed control PID to adjust the pressure of an air inlet manifold, the EGR rate and the ignition advance angle according to the electronic control data setting so as to adapt to idle speed working conditions, wherein the EGR rate is the opening degree of an exhaust gas recirculation valve, and the opening degree of a throttle valve is adjusted so as to realize the adjustment of the pressure of the air inlet manifold.
Step S202, after adjusting the opening degree of the EGR valve and the opening degree of the throttle valve to the corresponding preset opening degrees respectively, acquiring the pressure of an intake manifold of the engine;
Specifically, after the opening of the EGR valve of the engine and the opening of the throttle valve of the engine are respectively adjusted to the corresponding predetermined opening, the engine is stably operated under an idle condition, and then the pressure of the intake manifold of the engine is obtained to determine whether a negative pressure occurs in the intake manifold under the idle condition.
Step S203 of increasing the opening degree of the EGR valve and increasing the opening degree of the throttle valve so that the pressure of the intake manifold is greater than the pressure threshold value when the pressure of the intake manifold is less than or equal to the pressure threshold value.
Specifically, when the pressure of the intake manifold is less than or equal to the pressure threshold, it indicates whether the intake manifold has negative pressure and a larger vacuum degree under the idle working condition, and a phenomenon of pumping oil occurs, so that the opening of the EGR valve is increased and the opening of the throttle valve is increased to increase the pressure of the intake manifold, so that the pressure of the intake manifold is greater than the pressure threshold, and the phenomenon of pumping oil is avoided.
The embodiment of the invention provides a processor which is used for running a program, wherein the control method of the engine is executed when the program runs.
Specifically, the control method of the engine includes:
Step S201, when the engine is in an idle working condition, the opening degree of an exhaust gas recirculation valve of the engine and the opening degree of a throttle valve of the engine are respectively adjusted to corresponding preset opening degrees, wherein the idle working condition is a working condition of no-load operation of the engine;
specifically, different control logics are adopted when the engine is in different modes in the engine electronic control data, for example, when the engine is in an idle mode, the engine can perform idle speed control PID to adjust the pressure of an air inlet manifold, the EGR rate and the ignition advance angle according to the electronic control data setting so as to adapt to idle speed working conditions, wherein the EGR rate is the opening degree of an exhaust gas recirculation valve, and the opening degree of a throttle valve is adjusted so as to realize the adjustment of the pressure of the air inlet manifold.
Step S202, after adjusting the opening degree of the EGR valve and the opening degree of the throttle valve to the corresponding preset opening degrees respectively, acquiring the pressure of an intake manifold of the engine;
Specifically, after the opening of the EGR valve of the engine and the opening of the throttle valve of the engine are respectively adjusted to the corresponding predetermined opening, the engine is stably operated under an idle condition, and then the pressure of the intake manifold of the engine is obtained to determine whether a negative pressure occurs in the intake manifold under the idle condition.
Step S203 of increasing the opening degree of the EGR valve and increasing the opening degree of the throttle valve so that the pressure of the intake manifold is greater than the pressure threshold value when the pressure of the intake manifold is less than or equal to the pressure threshold value.
Specifically, when the pressure of the intake manifold is less than or equal to the pressure threshold, it indicates whether the intake manifold has negative pressure and a larger vacuum degree under the idle working condition, and a phenomenon of pumping oil occurs, so that the opening of the EGR valve is increased and the opening of the throttle valve is increased to increase the pressure of the intake manifold, so that the pressure of the intake manifold is greater than the pressure threshold, and the phenomenon of pumping oil is avoided.
The embodiment of the invention provides a vehicle, which comprises an engine, a processor, a memory and a program stored on the memory and capable of running on the processor, wherein the processor realizes at least the following steps when executing the program:
Step S201, when the engine is in an idle working condition, the opening degree of an exhaust gas recirculation valve of the engine and the opening degree of a throttle valve of the engine are respectively adjusted to corresponding preset opening degrees, wherein the idle working condition is a working condition of no-load operation of the engine;
specifically, different control logics are adopted when the engine is in different modes in the engine electronic control data, for example, when the engine is in an idle mode, the engine can perform idle speed control PID to adjust the pressure of an air inlet manifold, the EGR rate and the ignition advance angle according to the electronic control data setting so as to adapt to idle speed working conditions, wherein the EGR rate is the opening degree of an exhaust gas recirculation valve, and the opening degree of a throttle valve is adjusted so as to realize the adjustment of the pressure of the air inlet manifold.
Step S202, after adjusting the opening degree of the EGR valve and the opening degree of the throttle valve to the corresponding preset opening degrees respectively, acquiring the pressure of an intake manifold of the engine;
Specifically, after the opening of the EGR valve of the engine and the opening of the throttle valve of the engine are respectively adjusted to the corresponding predetermined opening, the engine is stably operated under an idle condition, and then the pressure of the intake manifold of the engine is obtained to determine whether a negative pressure occurs in the intake manifold under the idle condition.
Step S203 of increasing the opening degree of the EGR valve and increasing the opening degree of the throttle valve so that the pressure of the intake manifold is greater than the pressure threshold value when the pressure of the intake manifold is less than or equal to the pressure threshold value.
Specifically, when the pressure of the intake manifold is less than or equal to the pressure threshold, it indicates whether the intake manifold has negative pressure and a larger vacuum degree under the idle working condition, and a phenomenon of pumping oil occurs, so that the opening of the EGR valve is increased and the opening of the throttle valve is increased to increase the pressure of the intake manifold, so that the pressure of the intake manifold is greater than the pressure threshold, and the phenomenon of pumping oil is avoided.
The application also provides a computer program product adapted to perform, when executed on a data processing device, a program initialized with at least the following method steps:
Step S201, when the engine is in an idle working condition, the opening degree of an exhaust gas recirculation valve of the engine and the opening degree of a throttle valve of the engine are respectively adjusted to corresponding preset opening degrees, wherein the idle working condition is a working condition of no-load operation of the engine;
specifically, different control logics are adopted when the engine is in different modes in the engine electronic control data, for example, when the engine is in an idle mode, the engine can perform idle speed control PID to adjust the pressure of an air inlet manifold, the EGR rate and the ignition advance angle according to the electronic control data setting so as to adapt to idle speed working conditions, wherein the EGR rate is the opening degree of an exhaust gas recirculation valve, and the opening degree of a throttle valve is adjusted so as to realize the adjustment of the pressure of the air inlet manifold.
Step S202, after adjusting the opening degree of the EGR valve and the opening degree of the throttle valve to the corresponding preset opening degrees respectively, acquiring the pressure of an intake manifold of the engine;
Specifically, after the opening of the EGR valve of the engine and the opening of the throttle valve of the engine are respectively adjusted to the corresponding predetermined opening, the engine is stably operated under an idle condition, and then the pressure of the intake manifold of the engine is obtained to determine whether a negative pressure occurs in the intake manifold under the idle condition.
Step S203 of increasing the opening degree of the EGR valve and increasing the opening degree of the throttle valve so that the pressure of the intake manifold is greater than the pressure threshold value when the pressure of the intake manifold is less than or equal to the pressure threshold value.
Specifically, when the pressure of the intake manifold is less than or equal to the pressure threshold, it indicates whether the intake manifold has negative pressure and a larger vacuum degree under the idle working condition, and a phenomenon of pumping oil occurs, so that the opening of the EGR valve is increased and the opening of the throttle valve is increased to increase the pressure of the intake manifold, so that the pressure of the intake manifold is greater than the pressure threshold, and the phenomenon of pumping oil is avoided.
It will be appreciated by those skilled in the art that the modules or steps of the invention described above may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, they may be implemented in program code executable by computing devices, so that they may be stored in a storage device for execution by computing devices, and in some cases, the steps shown or described may be performed in a different order than that shown or described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Disks (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
It should also be noted that 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 an element.
From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:
1) In the control method of the engine, the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle valve of the engine are respectively adjusted to the corresponding preset opening under the idle working condition of the engine, the pressure of the air inlet manifold of the engine at the moment is detected, if the pressure of the air inlet manifold is smaller than or equal to the pressure threshold value, the phenomenon of pumping engine oil can occur when the vacuum degree of the air inlet manifold is larger, the opening of the exhaust gas recirculation valve is increased, the opening of the throttle valve is increased, the pressure of the air inlet manifold is larger than the pressure threshold value, the engine oil pumping can be avoided, the oil consumption of the engine oil is greatly reduced, and the problem of high engine oil consumption caused by the engine oil pumping due to low pressure of the air inlet manifold in the idle working condition of the engine in the prior art is solved.
2) In the engine control method according to the present application, when the pressure of the intake manifold is equal to or lower than the pressure threshold value, it is necessary to increase the opening degree of the EGR valve, but when the ambient temperature is low, the EGR valve is frozen, and further adjustment may damage the EGR valve, and therefore, when the current ambient temperature is lower than the temperature threshold value, and if the current ambient temperature is greater than or equal to the temperature threshold value, the EGR valve will not freeze, and the opening degree of the EGR valve and the opening degree of the throttle valve can be increased, so that the pressure of the intake manifold is greater than the pressure threshold value.
The above description is only of the preferred embodiments 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 protection scope of the present application.

Claims (10)

1. A control method of an engine, characterized by comprising:
Under the condition that an engine is in an idle working condition, respectively adjusting the opening of an exhaust gas recirculation valve of the engine and the opening of a throttle valve of the engine to corresponding preset opening, wherein the idle working condition is a working condition of no-load operation of the engine;
After adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle valve to the corresponding predetermined openings, respectively, obtaining the pressure of an intake manifold of the engine;
in the case where the pressure of the intake manifold is less than or equal to a pressure threshold value, the opening degree of the exhaust gas recirculation valve is increased and the opening degree of the throttle valve is increased so that the pressure of the intake manifold is greater than the pressure threshold value.
2. The method of claim 1, wherein increasing the opening of the exhaust gas recirculation valve and increasing the opening of the throttle valve such that the pressure of the intake manifold is greater than the pressure threshold if the pressure of the intake manifold is less than or equal to the pressure threshold comprises:
acquiring the ambient temperature at the current moment to obtain the current ambient temperature under the condition that the pressure of the air inlet manifold is smaller than or equal to a pressure threshold value;
If the current ambient temperature is less than a temperature threshold, not adjusting the opening of the exhaust gas recirculation valve and the opening of the throttle valve;
In the case where the current ambient temperature is greater than or equal to the temperature threshold value, the opening degree of the exhaust gas recirculation valve is increased and the opening degree of the throttle valve is increased so that the pressure of the intake manifold is greater than the pressure threshold value.
3. The method of claim 1, wherein increasing the opening of the exhaust gas recirculation valve and increasing the opening of the throttle valve such that the pressure of the intake manifold is greater than the pressure threshold comprises:
a first control step of controlling the opening degree of the exhaust gas recirculation valve to increase a first opening degree;
An obtaining step of obtaining the oxygen content of the air-fuel mixture of the intake manifold;
A second control step of controlling the opening degree of the throttle valve to increase a second opening degree so that the oxygen content of the air-fuel mixture of the intake manifold is greater than or equal to an oxygen content threshold value, in the case where the oxygen content of the air-fuel mixture of the intake manifold is less than the oxygen content threshold value;
and sequentially repeating the first control step, the acquisition step and the second control step at least once until the pressure of the intake manifold is greater than the pressure threshold.
4. The method according to claim 1, wherein adjusting the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle valve of the engine to the corresponding predetermined openings, respectively, comprises:
Acquiring the preset opening degree of the exhaust gas recirculation valve under the idle working condition to obtain a first preset opening degree, acquiring the preset opening degree of the throttle valve under the idle working condition to obtain a second preset opening degree, and acquiring a preset ignition advance angle of the idle working condition;
PID adjustment is conducted on the opening of the EGR valve until the opening of the EGR valve is equal to the first preset opening, PID adjustment is conducted on the opening of the throttle valve until the opening of the throttle valve is equal to the second preset opening, and PID adjustment is conducted on the ignition advance angle of the engine until the ignition advance angle is equal to the preset ignition advance angle.
5. The method according to any one of claims 1 to 4, characterized in that after adjusting the opening of an exhaust gas recirculation valve of the engine and the opening of a throttle valve of the engine to respective corresponding predetermined openings, the method further comprises, before acquiring the pressure of an intake manifold of the engine:
Acquiring a theoretical air-fuel ratio of the idle working condition;
The opening degree of the exhaust gas recirculation valve and the opening degree of the throttle valve are adjusted so that the actual air-fuel ratio is equal to the stoichiometric air-fuel ratio, with the fuel injection amount of the engine remaining unchanged.
6. The method according to any one of claims 1 to 4, characterized in that after acquiring the pressure of the intake manifold of the engine, the method further comprises:
And controlling the opening degree of the exhaust gas recirculation valve and the opening degree of the throttle valve to be unchanged when the pressure of the intake manifold is larger than the pressure threshold value.
7. The method according to any one of claims 1 to 4, characterized in that before adjusting the opening of the exhaust gas recirculation valve of the engine and the opening of the throttle valve of the engine to the corresponding predetermined openings, respectively, with the engine in idle condition, the method further comprises:
acquiring operation parameters of a vehicle to which an engine belongs, wherein the operation parameters comprise a gear, an engine rotating speed and an accelerator opening;
and under the condition that a first condition or a second condition is met, determining that the engine is in the idle working condition, wherein the first condition is that the gear is neutral gear and the engine rotating speed is not equal to zero, and the second condition is that the accelerator opening is equal to zero and the engine rotating speed is not equal to zero.
8. A control device of an engine, characterized by comprising:
The first adjusting unit is used for respectively adjusting the opening of an exhaust gas recirculation valve of the engine and the opening of a throttle valve of the engine to corresponding preset opening under the condition that the engine is in an idle working condition, wherein the idle working condition is a working condition of no-load operation of the engine;
A first acquisition unit configured to acquire a pressure of an intake manifold of the engine after adjusting an opening degree of the exhaust gas recirculation valve and an opening degree of the throttle valve to the respective predetermined opening degrees;
And a second adjustment unit configured to increase an opening degree of the exhaust gas recirculation valve and increase an opening degree of the throttle valve such that the pressure of the intake manifold is greater than a pressure threshold value, in a case where the pressure of the intake manifold is less than or equal to the pressure threshold value.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium includes a stored program, wherein the program, when run, controls a device in which the computer-readable storage medium is located to execute the control method of the engine according to any one of claims 1 to 7.
10. A vehicle characterized by comprising an engine, one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising a control method for executing the engine of any of claims 1-7.
CN202511328864.0A 2025-09-17 2025-09-17 Engine control methods, devices, computer-readable storage media, and vehicles Active CN120819447B (en)

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