CN115653770A

CN115653770A - Engine control method, engine control device, storage medium and equipment

Info

Publication number: CN115653770A
Application number: CN202211418791.0A
Authority: CN
Inventors: 兰江明
Original assignee: United Automotive Electronic Systems Co Ltd
Current assignee: United Automotive Electronic Systems Co Ltd
Priority date: 2022-11-14
Filing date: 2022-11-14
Publication date: 2023-01-31

Abstract

According to the technical scheme, the vehicle-mounted terminal obtains the current rotating speed and load parameters of the engine, and determines the target EGR valve opening, the target EGR rate and the target EGR flow of the engine under the current working condition based on the rotating speed and the load parameters, so that the operation flow is simplified. In addition, after the target EGR valve opening degree, the target EGR rate, and the target EGR flow rate are acquired, the vehicle-mounted terminal can control the opening degree of the EGR valve of the engine based on the target EGR valve opening degree and the current EGR valve opening degree, control the ignition timing of the engine based on the target EGR rate and the basic ignition angle, determine the fresh intake air amount of the engine based on the target EGR flow rate and the total intake air amount of the engine, and control the intake air amount of the engine based on the fresh intake air amount. Therefore, the control of the opening degree of an EGR valve, the ignition timing and the air intake of the engine can be efficiently realized.

Description

Engine control method, engine control device, storage medium and equipment

Technical Field

The application belongs to the technical field of automobiles, and particularly relates to an engine control method, an engine control device, a storage medium and equipment.

Background

With the proposal of double carbon targets of carbon peak reaching and carbon neutralization, higher requirements are put forward on energy conservation and emission reduction of the engine. In order to obtain higher thermal efficiency and lower emission index, EGR technology is widely applied to engines. Except for the common classical EGR of a self-suction engine, the supercharger type can be divided into high-pressure EGR and low-pressure EGR according to different arrangement forms of EGR pipelines on the engine. Wherein, the former takes gas from the front of the vortex and joins the gas into the intake manifold; the latter usually takes gas from after-catalysis and joins the pipeline after air filtration and before the compressor. Low-pressure EGR is recently more favored by various major plants because of its advantages of introducing EGR gas even at low speed and large load.

In the related art, the core problem of the control of any EGR does not go around a key point, namely, the relationship between the EGR rate and the opening degree of the EGR valve and the EGR flow rate. And the current EGR control logic calculates a target EGR flow based on the target EGR rate, calculates the target opening of the EGR valve according to the flow opening relation, and finally realizes the control effect that the actual EGR rate follows the target EGR rate.

However, in such a control logic, it is necessary to calculate the EGR flow rate from the EGR rate, and further, to establish a relationship between the EGR flow rate and the EGR valve opening degree, and the calculation is complicated by two conversions in the middle.

Disclosure of Invention

The application discloses an engine control method, an engine control device, a storage medium and engine control equipment, which can reduce the difficulty of controlling engine EGR.

In one aspect, an embodiment of the present application provides an engine control method, including:

acquiring the current rotating speed and load parameters of an engine, wherein the load parameters comprise at least one of the required torque, the inflation efficiency and the opening degree of an accelerator pedal of the engine;

determining a target EGR valve opening degree, a target EGR rate and a target EGR flow of the engine under the current working condition based on the current rotating speed and load parameters of the engine;

acquiring an actual EGR valve opening degree of the engine, a basic ignition angle of the engine and a total air inflow of the engine;

controlling an opening degree of an EGR valve of the engine based on the target EGR valve opening degree and the actual EGR valve opening degree;

determining a target ignition timing of the engine based on the target EGR rate and the base ignition angle, the target ignition timing being used to control an ignition timing of the engine;

determining a fresh intake air amount of the engine based on the target EGR flow and the total intake air amount, the fresh intake air amount being used for controlling the intake air amount of the engine.

In one possible implementation, the determining the target EGR valve opening, the target EGR rate and the target EGR flow rate of the engine under the current operating condition based on the current rotation speed and load parameters of the engine comprises:

and inquiring in an EGR parameter table based on the current rotating speed and load parameters of the engine to obtain the target EGR valve opening, the target EGR rate and the target EGR flow of the engine under the current working condition, wherein the parameters in the EGR parameter table are obtained at the stage of calibrating the engine rack.

In one possible embodiment, the obtaining the actual EGR valve opening degree of the engine, the base ignition angle of the engine, and the total intake air amount of the engine includes:

determining a preset duty ratio corresponding to the opening degree of the target EGR valve based on the EGR valve body characteristic of the engine; controlling an EGR valve of the engine to open based on the preset duty ratio, and determining the actual EGR valve opening of the EGR valve;

determining a basic ignition angle of the engine based on the current rotating speed and load parameters of the engine;

acquiring an intake manifold pressure and an intake manifold temperature of the engine; based on the intake manifold pressure and the intake manifold temperature, a total intake air amount of the engine is determined.

In one possible embodiment, the controlling the opening degree of the EGR valve of the engine based on the target EGR valve opening degree and the actual EGR valve opening degree includes:

inputting the actual EGR valve opening and the target EGR valve opening into a PID controller, and correcting the duty ratio corresponding to the actual EGR valve opening through the PID controller to obtain the corrected duty ratio;

adjusting an opening degree of an EGR valve of the engine based on the corrected duty ratio.

In one possible implementation, the determining a target ignition timing for the engine based on the target EGR rate and the base ignition angle includes:

correcting the basic ignition angle based on the target EGR rate to obtain a target ignition angle;

determining the target firing moment based on the target firing angle.

In one possible implementation, the determining the fresh intake air amount of the engine based on the target EGR flow rate and the total intake air amount includes:

and subtracting the target EGR flow from the total air inflow to obtain the fresh air inflow of the engine.

In one possible embodiment, before the controlling the opening degree of the EGR valve of the engine based on the target EGR valve opening degree and the actual EGR valve opening degree, the method further includes:

acquiring the maximum opening degree of an EGR valve of the engine;

the controlling an opening degree of an EGR valve of the engine based on the target EGR valve opening degree and the actual EGR valve opening degree includes:

controlling an opening degree of an EGR valve of the engine based on the maximum opening degree of the EGR valve, the target EGR valve opening degree, and the actual EGR valve opening degree.

In one possible embodiment, the obtaining of the maximum opening degree of an EGR valve of the engine includes:

determining a maximum opening of an EGR valve of the engine based on at least one of a rotational speed of the engine, an ambient temperature, and an ignition efficiency.

In one aspect, an embodiment of the present application provides an engine control apparatus, where the apparatus includes:

the engine parameter acquisition module is used for acquiring the current rotating speed and load parameters of the engine, wherein the load parameters comprise at least one of the required torque, the inflation efficiency and the opening degree of an accelerator pedal of the engine;

the EGR parameter acquisition module is used for determining the opening degree of a target EGR valve, the target EGR rate and the target EGR flow of the engine under the current working condition based on the current rotating speed and load parameters of the engine;

the engine parameter acquisition module is further used for acquiring the actual EGR valve opening degree of the engine, the basic ignition angle of the engine and the total air intake quantity of the engine;

a control module to control an opening of an EGR valve of the engine based on the target EGR valve opening and the actual EGR valve opening;

a control module further configured to determine a target ignition timing for the engine based on the target EGR rate and the base ignition angle, the target ignition timing being used to control an ignition timing of the engine;

and the control module is further used for determining a fresh air inflow of the engine based on the target EGR flow and the total air inflow, and the fresh air inflow is used for controlling the air inflow of the engine.

In a possible implementation manner, the EGR parameter obtaining module is configured to query an EGR parameter table based on a current rotation speed and a current load parameter of the engine to obtain a target EGR valve opening, a target EGR rate, and a target EGR flow of the engine under a current working condition, where parameters in the EGR parameter table are obtained at an engine bench calibration stage.

In a possible implementation manner, the engine parameter obtaining module is configured to determine a preset duty ratio corresponding to the target EGR valve opening degree based on an EGR valve body characteristic of the engine; controlling an EGR valve of the engine to open based on the preset duty ratio, and determining the actual EGR valve opening of the EGR valve; determining a base ignition angle of the engine based on the current rotating speed and load parameters of the engine; acquiring an intake manifold pressure and an intake manifold temperature of the engine; based on the intake manifold pressure and the intake manifold temperature, a total intake air amount of the engine is determined.

In a possible implementation manner, the control module is configured to input the actual EGR valve opening degree and the target EGR valve opening degree into a PID controller, and modify a duty ratio corresponding to the actual EGR valve opening degree by the PID controller to obtain a modified duty ratio; adjusting an opening degree of an EGR valve of the engine based on the corrected duty ratio.

In one possible implementation, the control module is further configured to modify the basic ignition angle based on the target EGR rate to obtain a target ignition angle; determining the target firing moment based on the target firing angle.

In one possible embodiment, the control module is further configured to subtract the total intake air amount from the target EGR flow to obtain a fresh intake air amount of the engine.

In a possible embodiment, the apparatus further comprises:

a maximum opening obtaining module for obtaining a maximum opening of an EGR valve of the engine;

the control module is used for controlling the opening degree of an EGR valve of the engine based on the maximum opening degree of the EGR valve, the target EGR valve opening degree and the actual EGR valve opening degree.

In one possible embodiment, the maximum opening obtaining module is configured to determine the maximum opening of an EGR valve of the engine based on at least one of a rotation speed of the engine, an ambient temperature, and an ignition efficiency.

In one aspect, an electronic device is provided, which includes:

at least one processor and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the aforementioned engine control method.

In one aspect, a non-transitory computer-readable storage medium stores computer instructions for causing a computer to execute the foregoing engine control method.

In one aspect, the present application also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to execute the aforementioned engine control method.

According to the technical scheme provided by the embodiment of the application, the vehicle-mounted terminal obtains the current rotating speed and load parameters of the engine, the target EGR valve opening, the target EGR rate and the target EGR flow of the engine under the current working condition are determined based on the rotating speed and the load parameters, the target EGR flow does not need to be calculated according to the target EGR rate, the target EGR valve opening is calculated according to the target EGR flow, and the operation flow is simplified. In addition, after the target EGR valve opening degree, the target EGR rate, and the target EGR flow rate are acquired, the vehicle-mounted terminal can control the opening degree of the EGR valve of the engine based on the target EGR valve opening degree and the current EGR valve opening degree, control the ignition timing of the engine based on the target EGR rate and the basic ignition angle, determine the fresh intake air amount of the engine based on the target EGR flow rate and the total intake air amount of the engine, and control the intake air amount of the engine based on the fresh intake air amount. Therefore, the control of the opening degree of an EGR valve, the ignition timing and the air intake of the engine can be efficiently realized.

Drawings

To more clearly explain the technical solutions of the present application and to facilitate a further understanding of the technical effects, technical features and objects of the present application, the present application will be described in detail with reference to the accompanying drawings, which form an essential part of the present specification, and which are used to explain the technical solutions of the present application together with the embodiments of the present application, but do not limit the present application.

FIG. 1 is a schematic diagram of an implementation environment provided by an embodiment of the present application;

FIG. 2 is a flow chart of a method of controlling an engine provided by an embodiment of the present application;

FIG. 3 is a flow chart of another engine control method provided by the embodiments of the present application;

FIG. 4 is a flowchart illustrating an exemplary method for controlling EGR opening according to an embodiment of the present disclosure;

FIG. 5 is a flowchart for determining a target ignition timing according to an embodiment of the present application;

fig. 6 is a flowchart of determining a fresh intake air amount according to an embodiment of the present application;

FIG. 7 is a schematic structural diagram of an engine control apparatus according to an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. It should be apparent that the described embodiments are only a few embodiments of the present application, and not all embodiments. The application is capable of other and different embodiments and its several details are capable of modifications and various changes in detail without departing from the spirit of the application. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the present application.

It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present application, a worker of ordinary skill in the art would recognize that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present application in a schematic manner, and the drawings only show the components related to the present application rather than the number, shape and size of the components in actual implementation, the form, quantity and proportion of the components in actual implementation can be changed freely, and the layout of the components can be more complicated.

In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.

In order to explain the technical solutions provided in the embodiments of the present application, the following first introduces terms related to the embodiments of the present application.

Ignition angle: when an engine (gasoline engine) works, the ignition moment has great influence on the working performance of the engine. Ignition is the spark plug sparking before the piston reaches compression top dead center, igniting the combustible mixture in the combustion chamber. The angle through which the crankshaft rotates during the period from the time of ignition until the piston reaches compression top dead center is referred to as the ignition angle. The ignition angle at which the engine can achieve optimum power, economy, and emissions is referred to as the optimum ignition angle.

EGR: is an abbreviation of Exhaust Gas Re-circulation, i.e., exhaust Gas recirculation. Exhaust gas recirculation refers to the recirculation of a portion of the exhaust gases from the engine back into the intake manifold and back into the cylinders along with fresh mixture. Since the exhaust gas contains a large amount of polyatomic gases such as CO2, and the gases such as CO2 cannot be combusted but absorb a large amount of heat due to their high specific heat capacity, the maximum combustion temperature of the air-fuel mixture in the cylinder is lowered, thereby reducing the amount of NOx generated.

An intake manifold: for a carbureted or throttle body gasoline injected engine, the intake manifold refers to the intake conduit after the carburettor or throttle body and before the cylinder head intake port. Its function is to distribute the mixture of air and fuel oil from carburetor or throttle body to the intake channel of each cylinder. For either port fuel injected engines or diesel engines, the intake manifold simply distributes the clean air to the cylinder intake ports. The intake manifold must distribute the air, fuel mixture or clean air as evenly as possible to the individual cylinders, for which reason the length of the gas channels in the intake manifold should be as equal as possible. To reduce gas flow resistance and improve intake capacity, the inner wall of the intake manifold should be smooth.

Calibrating a rack: in order to meet the requirements of engine performance development and finished automobile development, basic performance calibration needs to be carried out on the engine on a rack dynamometer aiming at different rotating speeds and different loads so as to ensure that the performance of the engine under various working conditions is optimal, and a good foundation is laid for the subsequent calibration of the finished automobile.

EGR rate: defined as the ratio of the amount of exhaust gas recirculated to the total amount of intake air drawn into the cylinder, reasonable control of the EGR rate is extremely important to the effect of nitrogen oxide purification and overall emissions, and a method is needed to quantify the EGR rate when performing calibration tests to assess the effect of exhaust gas recirculation on engine performance.

PID controller (proportional-integral-derivative controller): the device consists of a proportional unit (P), an integral unit (I) and a differential unit (D). PID controllers are primarily suitable for systems that are substantially linear and have dynamics that do not change over time.

After introducing the terms related to the embodiments of the present application, the following describes an implementation environment of the embodiments of the present application.

Fig. 1 is a schematic diagram of an implementation environment of an engine control method according to an embodiment of the present disclosure, and referring to fig. 1, the implementation environment includes an in-vehicle terminal 110 and a server 140.

The in-vehicle terminal 110 is connected to the server 140 through a wireless network, and a target application program for controlling the engine is run on the in-vehicle terminal 110. In some embodiments, vehicle-mounted terminal 110 and server 140 are connected in a wired or wireless manner. The in-vehicle terminal 110 has an application program that supports engine control running thereon.

Server 140 is configured to provide background services for a target application running on in-vehicle terminal 110.

After the implementation environment of the embodiment of the present application is introduced, an application scenario of the embodiment of the present application is described below.

According to the technical scheme, the vehicle-mounted terminal obtains the current rotating speed and load parameters of the engine, the target EGR valve opening, the target EGR rate and the target EGR flow of the engine under the current working condition are determined based on the rotating speed and the load parameters, the target EGR flow does not need to be calculated according to the target EGR rate, then the target EGR valve opening is calculated according to the target EGR flow, and the operation flow is simplified. In addition, after the target EGR valve opening degree, the target EGR rate, and the target EGR flow rate are acquired, the vehicle-mounted terminal can control the opening degree of the EGR valve of the engine based on the target EGR valve opening degree and the current EGR valve opening degree, control the ignition timing of the engine based on the target EGR rate and the basic ignition angle, determine the fresh intake air amount of the engine based on the target EGR flow rate and the total intake air amount of the engine, and control the intake air amount of the engine based on the fresh intake air amount. Therefore, the control of the opening degree of an EGR valve, the ignition timing and the air intake of the engine can be efficiently realized.

After the implementation environment and the application scenario of the embodiment of the present application are introduced, an engine control method provided by the embodiment of the present application is described below, with reference to fig. 2, taking an implementation subject as an in-vehicle terminal as an example, and the method includes:

201. the vehicle-mounted terminal obtains the current rotating speed and load parameters of the engine, wherein the load parameters comprise at least one of the required torque, the inflation efficiency and the opening degree of an accelerator pedal of the engine.

The current rotating speed of the engine is obtained through a rotating speed sensor of the engine. The required torque of the engine is used for representing the output torque required by the engine under the current working condition; the charging efficiency of the engine is used for representing the quality of air sucked by the engine under the current working condition and the standard state (one standard atmospheric pressure, 0 ℃, and the density of 1.293 kg/m) ³ ) The ratio of the mass of the drying air occupying the stroke volume of the piston of the cylinder; the accelerator pedal opening degree is used to indicate a degree to which the accelerator of the vehicle is depressed.

202. And the vehicle-mounted terminal determines the target EGR valve opening, the target EGR rate and the target EGR flow of the engine under the current working condition based on the current rotating speed and load parameters of the engine.

The target EGR valve opening degree, the target EGR rate, and the target EGR flow rate are parameters for controlling the engine. In the embodiment of the application, the vehicle-mounted terminal does not need to determine the target EGR flow based on the target EGR rate, then determines the target EGR valve opening degree through the target EGR flow, and can directly determine the target EGR valve opening degree, the target EGR rate and the target EGR flow through the current rotating speed and load parameters of the engine, so that decoupling of three EGR related parameters of the target EGR valve opening degree, the target EGR rate and the target EGR flow is realized.

203. The vehicle-mounted terminal acquires the actual EGR valve opening degree of the engine, the basic ignition angle of the engine and the total air intake quantity of the engine.

Wherein, the actual EGR valve opening is the EGR valve opening of the engine under the current working condition, the basic ignition angle of the engine is the unmodified ignition angle, and the total air intake quantity of the engine is the total quantity of gas which is taken in by the engine once, the total air intake quantity comprises the EGR flow and the quantity of gas which is taken in from the outside, and the quantity of gas which is taken in from the outside is also called as the fresh air intake quantity.

204. The in-vehicle terminal controls the opening of the EGR valve of the engine based on the target EGR valve opening and the actual EGR valve opening.

The target EGR valve opening degree is a target for controlling the EGR valve opening degree of the engine, the actual EGR valve opening degree is the actual opening degree of the EGR valve, the target for controlling the EGR valve opening degree of the engine through the target EGR valve opening degree and the actual EGR valve opening degree is to enable the actual EGR valve opening degree to be close to the target EGR valve opening degree as much as possible, the target EGR valve opening degree is determined based on the current rotating speed and load parameters of the engine, the current rotating speed and load parameters of the engine can change at any time in the driving process of the vehicle, the target EGR valve opening degree can change along with the target EGR valve opening degree, and the control process is a certain dynamic adjustment process.

205. The vehicle-mounted terminal determines a target ignition timing of the engine based on the target EGR rate and the basic ignition angle, the target ignition timing being used for controlling the ignition timing of the engine.

Wherein, the target EGR rate can adjust the basic ignition angle, so that the ignition angle of the engine is more consistent with the actual situation.

206. The vehicle-mounted terminal determines a fresh air intake quantity of the engine based on the target EGR flow and the total air intake quantity, and the fresh air intake quantity is used for controlling the air intake quantity of the engine.

The air intake quantity of the engine is controlled by performing air path calculation based on the fresh air intake quantity, so that the air intake quantity of the engine is controlled according to the result of the air path calculation.

According to the technical scheme, the vehicle-mounted terminal obtains the current rotating speed and load parameters of the engine, the target EGR valve opening, the target EGR rate and the target EGR flow of the engine under the current working condition are determined based on the rotating speed and the load parameters, the target EGR flow does not need to be calculated according to the target EGR rate, then the target EGR valve opening is calculated according to the target EGR flow, and the operation flow is simplified. In addition, after the target EGR valve opening degree, the target EGR rate, and the target EGR flow rate are acquired, the vehicle-mounted terminal can control the opening degree of the EGR valve of the engine based on the target EGR valve opening degree and the current EGR valve opening degree, control the ignition timing of the engine based on the target EGR rate and the basic ignition angle, determine the fresh intake air amount of the engine based on the target EGR flow rate and the total intake air amount of the engine, and control the intake air amount of the engine based on the fresh intake air amount. Thus, the control of the opening degree of the engine EGR valve, the ignition timing and the intake air amount can be efficiently realized.

The above steps 201-206 are simple descriptions of the engine control method provided by the embodiment of the present application, and the engine control method provided by the embodiment of the present application will be described in detail below with reference to some examples, and referring to fig. 3, the method includes:

301. the method comprises the steps that an EGR parameter table is obtained by a vehicle-mounted terminal, the EGR parameter table is used for storing corresponding relations between engine rotating speed and load parameters and EGR valve opening, EGR rate and EGR flow, the parameters in the EGR parameter table are obtained in an engine rack calibration stage, and the load parameters comprise at least one of required torque, inflation efficiency and accelerator pedal opening of an engine.

The required torque of the engine is used for representing the output torque required by the engine under the current working condition; the charging efficiency of the engine is used for expressing the ratio of the mass of air sucked by the engine under the current working condition to the mass of dry air occupying the stroke volume of a cylinder piston under a standard state (one standard atmospheric pressure, 0 ℃ and the density of 1.293kg/m & lt 3 & gt); the accelerator pedal opening degree is used to indicate a degree to which the accelerator of the vehicle is depressed.

In one possible embodiment, the vehicle-mounted terminal acquires an EGR parameter table of the engine from a server.

In the embodiment, the vehicle-mounted terminal can directly acquire the EGR parameter table of the engine from the server, and can subsequently acquire the relevant parameters for controlling the engine based on the EGR parameter table, so that the calculation amount of the vehicle-mounted terminal in the engine control process is reduced, and the control efficiency is improved.

For example, the vehicle-mounted terminal sends an EGR parameter table acquisition request to the server, where the EGR parameter table acquisition request carries a vehicle identifier of a vehicle in which the vehicle-mounted terminal is located. The server acquires the EGR parameter table acquisition request, and acquires the vehicle identifier from the EGR parameter table acquisition request. The server conducts query based on the vehicle identification, and determines that the vehicle identification corresponds to an engine of the vehicle. The server sends the EGR parameter table of the engine to the vehicle-mounted terminal, and the vehicle-mounted terminal acquires the EGR parameter table of the engine.

It should be noted that, the parameters in the EGR parameter table are obtained at the calibration stage of the engine pedestal, so the parameters in the EGR parameter table may be updated in a new calibration process, and in this case, the vehicle-mounted terminal may obtain the updated EGR parameter table directly from the server, so that it is ensured that the vehicle-mounted terminal uses the latest parameters to control the engine, and the control effect on the engine is improved.

In order to more clearly explain the above embodiment, a method of generating the EGR parameter table will be described below.

In one possible implementation, multiple sets of EGR valve opening degrees of the engine at different rotation speeds and different load parameters are obtained in the engine bench calibration stage, one set of EGR valve opening degrees corresponds to a pair of rotation speed/load parameter combinations, and one set of EGR valve opening degrees comprises multiple EGR valve opening degrees. And screening the opening degree of each group of EGR valves based on the actual oil consumption of the engine under different working conditions to obtain the target opening degree of each group of EGR valves, wherein the target opening degree of each group of EGR valves is the corresponding opening degree of the EGR valve when the oil consumption of the engine is the lowest. The EGR rate and the EGR flow rate of the engine at the target EGR valve opening degree are acquired as the target EGR rate and the target EGR flow rate of the engine at the target EGR valve opening degree.

In the above-described embodiment, the target EGR valve opening degree, the target EGR rate, and the target EGR flow rate corresponding to each of a plurality of pairs of combinations of rotation speed and load parameters can be obtained, and the target EGR valve opening degree, the target EGR rate, and the target EGR flow rate corresponding to each of the plurality of pairs of combinations of rotation speed and load parameters are stored in a list form to obtain the EGR parameter table of the engine. Therefore, in the subsequent engine control process, the corresponding control parameters can be directly obtained from the EGR parameter table, and the efficiency is high.

In some embodiments, before storing the target EGR valve opening degree, the target EGR rate, and the target EGR flow rate corresponding to each of the plurality of pairs of rotation speed/load parameter combinations, the target EGR valve opening degree, the target EGR rate, and the target EGR flow rate corresponding to each of the plurality of pairs of rotation speed/load parameter combinations may be optimized, and the target EGR valve opening degree, the target EGR rate, and the target EGR flow rate corresponding to each of the plurality of optimized pairs of rotation speed/load parameter combinations may be stored in a list form.

In some embodiments, in the case where the engine is equipped with a mixing valve, such as LP-EGR (low pressure exhaust gas recirculation), the target EGR valve opening degree includes the opening degree of a plurality of EGR valves in the mixing valve, that is, a combination of the plurality of EGR valve opening degrees.

302. And the vehicle-mounted terminal acquires the current rotating speed and load parameters of the engine.

The current rotating speed of the engine is obtained through a rotating speed sensor of the engine. The load parameter includes at least one of a required torque, an inflation efficiency and an accelerator pedal opening degree of the engine, in the embodiment of the present application, the type of data in the load parameter is set by a technician according to an actual situation, and the embodiment of the present application is not limited thereto. In the following description, the load parameter including the required torque of the engine is taken as an example.

In one possible embodiment, the vehicle-mounted terminal obtains the current rotation speed of the engine through a rotation speed sensor of the engine. The vehicle-mounted terminal acquires the required torque of the engine under the current working condition.

In this embodiment, the in-vehicle terminal can directly acquire the current rotation speed and the required torque of the engine, and subsequent engine control can be performed based on the current rotation speed and the required torque of the engine.

303. And the vehicle-mounted terminal determines the target EGR valve opening degree, the target EGR rate and the target EGR flow rate of the engine under the current working condition based on the current rotating speed and load parameters of the engine.

In a possible implementation manner, the vehicle-mounted terminal queries in an EGR parameter table based on the current rotating speed and load parameters of the engine to obtain a target EGR valve opening, a target EGR rate and a target EGR flow rate of the engine under the current working condition, wherein the parameters in the EGR parameter table are obtained in an engine bench calibration stage.

In this embodiment, the vehicle-mounted terminal can acquire the target EGR valve opening degree, the target EGR rate, and the target EGR flow rate directly from the EGR parameter table without performing complicated calculations, and the target EGR valve opening degree, the target EGR rate, and the target EGR flow rate are acquired efficiently.

For example, referring to fig. 4, the vehicle-mounted terminal looks up in the EGR parameter table based on the current rotation speed of the engine and the required torque of the engine under the current operating condition to obtain the target EGR valve opening of the engine under the current operating condition. Referring to fig. 5, the vehicle-mounted terminal looks up in the EGR parameter table based on the current rotation speed of the engine and the required torque of the engine under the current operating condition to obtain the target EGR rate of the engine under the current operating condition. Referring to fig. 6, the vehicle-mounted terminal looks up in the EGR parameter table based on the current rotation speed of the engine and the required torque of the engine under the current operating condition to obtain the target EGR flow rate of the engine under the current operating condition.

In some embodiments, the EGR parameter table often cannot be used in an exhaustive list, and before the current rotation speed of the engine and the required torque of the engine under the current working condition are queried in the EGR parameter table, the vehicle-mounted terminal can normalize the current rotation speed and the required torque of the engine to obtain a rotation speed section to which the current rotation speed of the engine belongs and a torque section to which the required torque belongs, and query the EGR parameter table in a manner of the rotation speed section and the torque section, and accordingly, the EGR parameter table stores a target EGR valve opening, a target EGR rate and a target EGR flow rate respectively corresponding to a combination of a plurality of rotation speed sections and a plurality of torque sections.

In some embodiments, the EGR parameter table further stores target relationship data obtained by fitting parameters obtained in the calibration stage of the engine bench, the target relationship data being used for representing the correspondence between the engine speed and load parameters and the EGR valve opening, the EGR rate and the EGR flow rate. Under the condition that the current rotating speed of the engine and the target EGR valve opening, the target EGR rate and the target EGR flow rate corresponding to the required torque of the engine under the current working condition are not inquired in the EGR parameter table, the vehicle-mounted terminal brings the current rotating speed of the engine and the required torque of the engine under the current working condition into the target relation data to obtain the target EGR valve opening, the target EGR rate and the target EGR flow rate.

304. The vehicle-mounted terminal acquires an actual EGR valve opening degree of the engine, a basic ignition angle of the engine and a total air intake quantity of the engine.

In one possible implementation, the vehicle-mounted terminal determines a preset duty ratio corresponding to the target EGR valve opening degree based on the EGR valve body characteristic of the engine. The vehicle-mounted terminal controls the opening of an EGR valve of the engine based on the preset duty ratio, and determines the actual opening of the EGR valve. And the vehicle-mounted terminal determines a basic ignition angle of the engine based on the current rotating speed and load parameters of the engine. The in-vehicle terminal acquires an intake manifold pressure and an intake manifold temperature of the engine. The vehicle-mounted terminal determines the total intake air amount of the engine based on the intake manifold pressure and the intake manifold temperature.

The valve body characteristic relates to duty ratios to be sent at different supply voltages and different EGR valve opening degrees (the opening degree is mainly for a butterfly valve, and for a poppet valve, this corresponds to a valve element lift).

In this embodiment, the in-vehicle terminal can determine a preset duty ratio corresponding to the target EGR valve opening degree from the valve body characteristics, and control the EGR valve opening of the engine based on the preset duty ratio, thereby acquiring the actual EGR valve opening degree of the EGR valve. The vehicle-mounted terminal can directly determine the basic ignition angle of the engine based on the current rotating speed and load parameters of the engine. The vehicle-mounted terminal can determine the total intake air amount of the engine based on the intake manifold pressure and the intake manifold temperature, so as to perform subsequent processing.

For example, the vehicle-mounted terminal performs query based on the EGR valve body characteristic of the engine to obtain the preset duty ratio of the engine under the target EGR valve opening degree. And the vehicle-mounted terminal sends a control signal to the engine based on the preset duty ratio, and controls an EGR valve of the engine to be opened at an opening degree corresponding to the control signal based on the control signal. The vehicle-mounted terminal acquires the actual EGR valve opening degree of the EGR valve based on a sensor on the EGR valve of the engine. And the vehicle-mounted terminal inquires based on the current rotating speed and load parameters of the engine to obtain the basic ignition angle of the engine. The vehicle-mounted terminal acquires the pressure and the temperature of an intake manifold of the engine through an intake manifold sensor of the engine. And the vehicle-mounted terminal carries out calculation on the basis of the pressure and the temperature of the intake manifold of the engine to obtain the total air inflow of the engine.

In some embodiments, the vehicle-mounted terminal can also perform correction in combination with the operation state of the engine in the process of acquiring the total air quantity of the engine, and the steps are as follows.

In one possible embodiment, the vehicle-mounted terminal determines a reference total intake air amount of the engine based on the intake manifold pressure and the intake manifold temperature. And the vehicle-mounted terminal corrects the reference total air inflow based on the running state parameters of the engine to obtain the total air inflow of the engine.

Wherein the operating state parameter includes at least one of an exhaust VVT (variable valve timing) position, an exhaust pressure, and a throttle opening of the engine.

305. The in-vehicle terminal controls the opening of the EGR valve of the engine based on the target EGR valve opening and the actual EGR valve opening.

In one possible embodiment, the vehicle-mounted terminal inputs the actual EGR valve opening degree and the target EGR valve opening degree to the PID controller, and the PID controller corrects the duty ratio corresponding to the actual EGR valve opening degree to obtain the corrected duty ratio. The vehicle-mounted terminal adjusts the opening degree of the EGR valve of the engine based on the corrected duty ratio.

In this embodiment, the in-vehicle terminal can dynamically control the opening degree of the EGR valve by controlling the opening degree of the EGR valve of the engine by the PID method.

For example, the in-vehicle terminal inputs the actual EGR valve opening degree and the target EGR valve opening degree to the PID controller, and the PID controller corrects the duty ratio corresponding to the actual EGR valve opening degree to obtain the corrected duty ratio. And the vehicle-mounted terminal sends a control signal to the engine based on the corrected duty ratio, and controls an EGR valve of the engine to be opened at an opening corresponding to the control signal based on the control signal. For example, referring to fig. 4, when the vehicle-mounted terminal obtains the target EGR opening degree, the vehicle-mounted terminal determines a preset duty ratio according to the target EGR opening degree, controls the EGR valve of the engine to open according to the preset duty ratio, and obtains the actual EGR valve opening degree of the EGR valve of the engine. The vehicle-mounted terminal inputs the actual EGR valve opening and the target EGR valve opening into a PID controller, corrects the duty ratio by the PID controller, and controls the opening of the EGR valve of the engine based on the corrected duty ratio.

In some embodiments, the in-vehicle terminal can also control the opening degree of the EGR valve based on other parameters, as follows.

In one possible embodiment, the vehicle-mounted terminal acquires the maximum opening degree of the EGR valve of the engine. The in-vehicle terminal controls the opening of the EGR valve of the engine based on the maximum opening of the EGR valve, the target EGR valve opening, and the actual EGR valve opening.

The maximum opening degree of the EGR valve is a limit for the opening degree of the EGR valve, and a failure caused by an excessively large opening degree of the EGR valve can be avoided by the maximum opening degree of the EGR valve.

For example, the vehicle-mounted terminal determines the maximum opening degree of the EGR valve of the engine based on at least one of the rotation speed of the engine, the ambient temperature, and the ignition efficiency. And the vehicle-mounted terminal inputs the actual EGR valve opening degree and the target EGR valve opening degree into a PID controller, and the duty ratio corresponding to the actual EGR valve opening degree is corrected through the PID controller to obtain the corrected duty ratio. The in-vehicle terminal determines a reference EGR valve opening degree of the EGR valve based on the corrected duty ratio. Adjusting the opening degree of the EGR valve based on the reference EGR valve opening degree in a case where the reference EGR valve opening degree is smaller than the maximum opening degree of the EGR valve; when the reference EGR valve opening degree is greater than or equal to the maximum opening degree of the EGR valve, the opening degree of the EGR valve is adjusted based on the maximum opening degree of the EGR valve.

306. The vehicle-mounted terminal determines a target ignition timing of the engine based on the target EGR rate and the base ignition angle, the target ignition timing being used for controlling an ignition timing of the engine.

In one possible embodiment, the vehicle-mounted terminal corrects the basic ignition angle based on the target EGR rate to obtain a target ignition angle. The vehicle-mounted terminal determines the target ignition timing based on the target ignition angle.

The target ignition time is the better ignition time of the engine, and the target ignition time is used for ignition, so that knocking can be reduced, and the efficiency of the engine is improved.

In this embodiment, the vehicle-mounted terminal can correct the basic ignition angle based on the target EGR rate to obtain the target ignition angle, and the determination of the target ignition timing based on the target ignition angle can control the engine to operate at higher efficiency.

For example, the in-vehicle terminal determines an ignition angle correction parameter based on the target EGR rate. And the vehicle-mounted terminal fuses the basic ignition angle and the ignition angle correction parameter to obtain the target ignition angle. The vehicle-mounted terminal determines the target ignition timing based on the target ignition angle. For example, referring to fig. 5, the vehicle-mounted terminal determines the basic ignition angle of the engine through the current speed and load parameters of the engine. The vehicle-mounted terminal corrects the basic ignition angle based on the target EGR rate to obtain corrected ignition time.

Practical experience shows that the ignition angle has a more pronounced trend relationship with the EGR rate than the EGR valve opening. Therefore, the EGR rate is used as an intermediate process quantity and is mainly used for calculating the optimal ignition moment of the engine working under the working conditions with a certain rotating speed and a certain load parameter. The target EGR rate is obtained in the calibration stage of the engine bench, and is carried out based on the value when other corrections are calculated by calling the target EGR rate, so that the uniqueness of the target EGR rate can be realized. The method is beneficial to data unification of other correction models, and avoids the control data flow challenge caused by the inconsistency of one target EGR rate and one actual EGR rate in software.

306. The vehicle-mounted terminal determines a fresh air intake quantity of the engine based on the target EGR flow and the total air intake quantity, and the fresh air intake quantity is used for controlling the air intake quantity of the engine.

In one possible embodiment, the vehicle-mounted terminal subtracts the total intake air amount from the target EGR flow to obtain a fresh intake air amount of the engine.

According to the technical scheme provided by the embodiment of the application, the vehicle-mounted terminal obtains the current rotating speed and load parameters of the engine, the target EGR valve opening, the target EGR rate and the target EGR flow of the engine under the current working condition are determined based on the rotating speed and the load parameters, the target EGR flow does not need to be calculated according to the target EGR rate, the target EGR valve opening is calculated according to the target EGR flow, and the operation flow is simplified. In addition, after the target EGR valve opening degree, the target EGR rate, and the target EGR flow rate are acquired, the vehicle-mounted terminal can control the opening degree of the EGR valve of the engine based on the target EGR valve opening degree and the current EGR valve opening degree, control the ignition timing of the engine based on the target EGR rate and the basic ignition angle, determine the fresh intake air amount of the engine based on the target EGR flow rate and the total intake air amount of the engine, and control the intake air amount of the engine based on the fresh intake air amount. Thus, the control of the opening degree of the engine EGR valve, the ignition timing and the intake air amount can be efficiently realized.

In correspondence with the above method embodiment, referring to fig. 7, the present embodiment also provides an engine control apparatus 700, including: an engine parameter acquisition module 701, an EGR parameter acquisition module 702, and a control module 703.

The engine parameter acquiring module 701 is used for acquiring the current rotating speed of the engine and load parameters, wherein the load parameters comprise at least one of the required torque, the inflation efficiency and the opening degree of an accelerator pedal of the engine.

An EGR parameter obtaining module 702 is configured to determine a target EGR valve opening, a target EGR rate, and a target EGR flow rate of the engine under a current operating condition based on a current rotation speed and a current load parameter of the engine.

The engine parameter acquisition module 701 is further configured to acquire an actual EGR valve opening of the engine, a base ignition angle of the engine, and a total intake air amount of the engine.

A control module 703 for controlling the opening of the EGR valve of the engine based on the target EGR valve opening and the actual EGR valve opening.

The control module 703 is further configured to determine a target ignition timing for the engine based on the target EGR rate and the base ignition angle, the target ignition timing being used to control the ignition timing of the engine.

The control module 703 is further configured to determine a fresh intake air amount for the engine based on the target EGR flow and the total intake air amount, the fresh intake air amount being used to control the intake air amount of the engine.

In a possible implementation manner, the EGR parameter obtaining module 702 is configured to perform a query in an EGR parameter table based on current rotation speed and load parameters of the engine to obtain a target EGR valve opening, a target EGR rate, and a target EGR flow rate of the engine under a current operating condition, where the parameters in the EGR parameter table are obtained in an engine pedestal calibration stage.

In one possible implementation, the engine parameter obtaining module 701 is configured to determine a preset duty ratio corresponding to the target EGR valve opening degree based on an EGR valve body characteristic of the engine. And controlling the EGR valve of the engine to open based on the preset duty ratio, and determining the actual EGR valve opening of the EGR valve. A base ignition angle for the engine is determined based on the current speed and load parameters of the engine. An intake manifold pressure and an intake manifold temperature of the engine are obtained. Based on the intake manifold pressure and the intake manifold temperature, a total intake air amount of the engine is determined.

In a possible embodiment, the control module 703 is configured to input the actual EGR valve opening degree and the target EGR valve opening degree into a PID controller, and the PID controller corrects a duty ratio corresponding to the actual EGR valve opening degree to obtain a corrected duty ratio. The opening degree of an EGR valve of the engine is adjusted based on the corrected duty ratio.

In one possible implementation, the control module 703 is further configured to modify the base ignition angle based on the target EGR rate to obtain a target ignition angle. The target ignition timing is determined based on the target ignition angle.

In one possible implementation, the control module 703 is also configured to subtract the total intake air amount from the target EGR flow to obtain a fresh intake air amount for the engine.

In one possible embodiment, the apparatus further comprises:

a maximum opening obtaining module obtains a maximum opening of an EGR valve of the engine.

The control module 703 is configured to control an opening of an EGR valve of the engine based on a maximum opening of the EGR valve, the target EGR valve opening, and the actual EGR valve opening.

In one possible embodiment, the maximum opening obtaining module is configured to determine a maximum opening of an EGR valve of the engine based on at least one of a rotation speed, an ambient temperature, and an ignition efficiency of the engine.

Referring to fig. 8, an embodiment of the present application further provides an electronic device 800, including:

at least one processor; and (c) a second step of,

a memory communicatively coupled to the at least one processor; the electronic device is the vehicle-mounted terminal in the embodiment.

The memory stores instructions executable by the at least one processor to enable the at least one processor to perform the engine control method of the preceding method embodiment.

Embodiments of the present application also provide a non-transitory computer-readable storage medium storing computer instructions for causing a computer to execute the engine control method in the foregoing method embodiments.

Embodiments of the present application also provide a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to perform the engine control method of the aforementioned method embodiments.

Referring now to FIG. 8, shown is a schematic diagram of an electronic device 800 suitable for use in implementing embodiments of the present application. The electronic device 800 in the embodiment of the present application may include, but is not limited to, mobile electronic devices such as a notebook computer, a digital broadcast receiver, a PDA (personal digital assistant), a PAD (tablet computer), a PMP (portable multimedia player), and the like, and stationary electronic devices such as a digital TV, a desktop computer, and the like. The electronic device 800 shown in fig. 8 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present application.

As shown in fig. 8, an electronic device 800 may include a processing means (e.g., central processing unit, graphics processor, etc.) 801 that may perform various appropriate actions and processes in accordance with a program stored in a Read Only Memory (ROM) 802 or a program loaded from a storage means 808 into a Random Access Memory (RAM) 803. In the RAM 803, various programs and data necessary for the operation of the electronic apparatus 800 are also stored. The processing device 801, the ROM 802, and the RAM 803 are connected to each other by a bus 804. An input/output (I/O) interface 805 is also connected to bus 804.

Generally, the following devices may be connected to the I/O interface 805: input devices 806 including, for example, a touch screen, touch pad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, or the like; output devices 807 including, for example, a Liquid Crystal Display (LCD), speakers, vibrators, or the like; storage 808 including, for example, magnetic tape, hard disk, etc.; and a communication device 809. The communication means 809 may allow the electronic device 800 to communicate wirelessly or by wire with other devices to exchange data. While the figure illustrates an electronic device 800 having various means, it is to be understood that not all illustrated means are required to be implemented or provided. More or fewer devices may alternatively be implemented or provided.

In particular, according to an embodiment of the present disclosure, the processes described above with reference to the flowcharts may be implemented as computer software programs. For example, embodiments of the present disclosure include a computer program product comprising a computer program embodied on a computer readable medium, the computer program comprising program code for performing the method illustrated in the flow chart. In such an embodiment, the computer program may be downloaded and installed from a network through the communication means 809, or installed from the storage means 808, or installed from the ROM 802. When executed by the processing apparatus 801, the computer program performs the above-described functions defined in the method of the embodiment of the present application.

It should be noted that the computer readable medium in the present disclosure can be a computer readable signal medium or a computer readable storage medium or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, 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. In the present disclosure, a computer 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. In contrast, in the present disclosure, a computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: electrical wires, optical cables, RF (radio frequency), etc., or any suitable combination of the foregoing.

The computer readable medium may be embodied in the electronic device; or may be separate and not incorporated into the electronic device.

The computer readable medium carries one or more programs which, when executed by the electronic device, cause the electronic device to: acquiring at least two internet protocol addresses; sending a node evaluation request comprising the at least two internet protocol addresses to node evaluation equipment, wherein the node evaluation equipment selects the internet protocol addresses from the at least two internet protocol addresses and returns the internet protocol addresses; receiving an internet protocol address returned by the node evaluation equipment; wherein the obtained internet protocol address indicates an edge node in the content distribution network.

Alternatively, the computer readable medium carries one or more programs which, when executed by the electronic device, cause the electronic device to: receiving a node evaluation request comprising at least two internet protocol addresses; selecting an internet protocol address from the at least two internet protocol addresses; returning the selected internet protocol address; wherein the received internet protocol address indicates an edge node in the content distribution network.

Computer program code for carrying out operations for aspects of the present disclosure may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C + +, 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 computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

The units described in the embodiments of the present application may be implemented by software or hardware. Where the name of a unit does not in some cases constitute a limitation of the unit itself, for example, the first retrieving unit may also be described as a "unit for retrieving at least two internet protocol addresses".

Claims

1. An engine control method characterized by comprising:

determining the opening degree of a target EGR valve, the target EGR rate and the target EGR flow of the engine under the current working condition based on the current rotating speed and load parameters of the engine;

controlling an opening of an EGR valve of the engine based on the target EGR valve opening and the actual EGR valve opening;

2. The engine control method of claim 1, wherein determining the target EGR valve opening, the target EGR rate, and the target EGR flow rate for the engine at the current operating condition based on the current speed and load parameters of the engine comprises:

3. The engine control method according to claim 1, characterized in that the obtaining the actual EGR valve opening degree of the engine, the base ignition angle of the engine, and the total intake air amount of the engine includes:

determining a base ignition angle of the engine based on the current rotating speed and load parameters of the engine;

4. The engine control method according to claim 1, characterized in that the controlling the opening degree of the EGR valve of the engine based on the target EGR valve opening degree and the actual EGR valve opening degree includes:

5. The engine control method according to claim 1, wherein the determining a target ignition timing of the engine based on the target EGR rate and the base ignition angle comprises:

determining the target ignition timing based on the target ignition angle.

6. The engine control method according to claim 1, characterized in that the determining a fresh intake air amount of the engine based on the target EGR flow rate and the total intake air amount includes:

7. The engine control method according to any one of claims 1 to 6, characterized in that before the controlling the opening degree of the EGR valve of the engine based on the target EGR valve opening degree and the actual EGR valve opening degree, the method further comprises:

acquiring the maximum opening degree of an EGR valve of the engine;

8. The engine control method according to any one of claim 7, characterized in that the obtaining the maximum opening degree of the EGR valve of the engine includes:

determining a maximum opening of an EGR valve of the engine based on at least one of a rotational speed, an ambient temperature, and an ignition efficiency of the engine.

9. An engine control apparatus comprising:

the EGR parameter acquisition module is used for determining the target EGR valve opening, the target EGR rate and the target EGR flow of the engine under the current working condition based on the current rotating speed and load parameters of the engine;

and the control module is also used for determining the fresh air inflow of the engine based on the target EGR flow and the total air inflow, and the fresh air inflow is used for controlling the air inflow of the engine.

10. An electronic device, characterized in that the electronic device comprises:

at least one processor; and the number of the first and second groups,

a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,

the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the engine control method of any one of the preceding claims 1-8.

11. A non-transitory computer-readable storage medium storing computer instructions for causing a computer to execute the engine control method of any one of the preceding claims 1-8.