阅读说明：本技术 一种egr控制方法、装置及电子设备 (EGR control method and device and electronic equipment ) 是由 刘兴义 江楠 张霞 于 2021-09-23 设计创作，主要内容包括：本申请公开一种EGR控制方法、装置及电子设备,该方法包括：根据系统设定的进入进气歧管的空气质量流量及系统设定的进气歧管压力值,计算第一EGR阀门开度；将空气质量流量与进入进气歧管的当前空气质量流量之间的差值输入PID控制器,生成第二EGR阀门开度；将第一EGR阀门开度与第二EGR阀门开度求和,得到第三EGR阀门开度；根据第三EGR阀门开度,对进入进气歧管的空气质量流量进行控制。基于以上方法,不需要进行复杂的标定,且通过机理模型计算出的第一EGR阀门开度与实际所需的EGR阀门开度之间误差较小,从而减少PID控制环节的调整时间,避免系统对进入气缸的空气质量流量调控的时间长,不能快速进入目标状态的问题。(The application discloses EGR control method, device and electronic equipment, and the method comprises the following steps: calculating the opening degree of a first EGR valve according to the mass flow of air entering an air inlet manifold set by a system and the pressure value of the air inlet manifold set by the system; inputting the difference value between the air mass flow and the current air mass flow entering the intake manifold into a PID controller to generate a second EGR valve opening degree; summing the first EGR valve opening and the second EGR valve opening to obtain a third EGR valve opening; and controlling the mass flow of air entering the intake manifold according to the opening degree of the third EGR valve. Based on the method, complex calibration is not needed, and the error between the first EGR valve opening calculated through the mechanism model and the actually required EGR valve opening is small, so that the adjusting time of a PID control link is reduced, and the problems that the system has long time for regulating and controlling the mass flow of the air entering the air cylinder and cannot enter a target state quickly are solved.)

1. An EGR control method, characterized in that the method comprises:

calculating the opening degree of a first EGR valve according to the mass flow of air entering an air inlet manifold set by a system and the pressure value of the air inlet manifold set by the system;

inputting the difference value between the air mass flow and the current air mass flow entering an air intake manifold into a PID controller to generate a second EGR valve opening degree;

summing the first EGR valve opening and the second EGR valve opening to obtain a third EGR valve opening;

and controlling the mass flow of the air entering the intake manifold according to the opening degree of the third EGR valve.

2. The method of claim 1, wherein calculating a first EGR valve opening based on a system set mass airflow into the intake manifold and a system set intake manifold pressure comprises:

calculating the mass flow of the gas entering the cylinder of the engine according to the pressure value of the intake manifold;

calculating to obtain the exhaust mass flow of the EGR valve according to the air mass flow and the gas mass flow;

and calculating the opening degree of the first EGR valve according to the exhaust mass flow.

3. The method of claim 1, wherein said controlling said mass air flow into the intake manifold based on said third EGR valve opening comprises:

adjusting the opening degree of the EGR valve according to the opening degree of the third EGR valve;

and controlling the mass flow of the air entering the intake manifold according to the opening degree of the EGR valve.

4. The method of claim 2, wherein the mass flow of gas into the engine cylinder is calculated based on the intake manifold pressure value by the equation

Wherein, W_inFor the gas mass flow, k_inFor conversion factor, n is engine speed, V_engFor engine displacement, R is the gas constant, P_inFor intake manifold pressure, T_inIs the intake manifold temperature.

5. The method of claim 4, wherein the mass flow of exhaust gas to the EGR valve is calculated based on the mass flow of air and the mass flow of gas by the equation

Wherein, W_EGRFor the purpose of the exhaust gas mass flow,derivative of intake manifold pressure, V_inIs the intake manifold volume.

6. The method of claim 5, wherein said first EGR valve opening is calculated based on said exhaust mass flow rate by the formula

Wherein, U_EGRIs said first EGR valve opening, C_EGRFor EGR valve throttling factor, P_outTo exhaust manifold pressure, T_outIs the exhaust manifold temperature.

7. An EGR control apparatus, characterized in that the apparatus comprises:

the calculation module is used for calculating the opening degree of the first EGR valve according to the mass flow of air entering the air inlet manifold set by the system and the pressure value of the air inlet manifold set by the system;

the generating module is used for inputting the difference value between the air mass flow and the current air mass flow entering the intake manifold into a PID controller to generate a second EGR valve opening;

a summing module for summing the first EGR valve opening and the second EGR valve opening to obtain a third EGR valve opening;

and the processing model is used for controlling the air mass flow entering the intake manifold according to the third EGR valve opening degree.

8. The apparatus of claim 7, wherein the computing module is specifically configured to:

calculating the mass flow of the gas entering the cylinder of the engine according to the pressure value of the intake manifold;

calculating to obtain the exhaust mass flow of the EGR valve according to the air mass flow and the gas mass flow;

and calculating the opening degree of the first EGR valve according to the exhaust mass flow.

9. An electronic device, comprising:

a memory for storing a computer program;

a processor for implementing the method steps of any one of claims 1-6 when executing the computer program stored on the memory.

10. A computer-readable storage medium, characterized in that a computer program is stored in the computer-readable storage medium, which computer program, when being executed by a processor, carries out the method steps of any one of claims 1-6.

Technical Field

The present disclosure relates to the field of engine control technologies, and in particular, to an EGR control method, an EGR control device, and an electronic device.

Background

In order to meet the increasingly strict Exhaust emission requirements of the engine, an Exhaust Gas Recirculation (EGR) system is usually provided in cooperation with the engine to return part of the Exhaust Gas discharged from the engine to an intake manifold, and the Exhaust Gas and fresh air mixture are Re-introduced into the cylinder together to reduce the oxygen content in the intake air, thereby reducing the combustion temperature and reducing the emission pollution. However, in the process of exhaust gas recirculation, if too much exhaust gas is recycled, the oxygen content entering the cylinder cannot meet the specified value, and the power of the engine is further affected, so that the opening of the EGR valve is controlled according to the actual working condition of the engine, the mass flow of the recycled exhaust gas is further controlled, the normal use of the engine is ensured, and the exhaust emission can be reduced, which is very important.

In order to solve the problems, the traditional scheme realizes the closed-loop control of the recycled air mass flow through a PID controller, wherein PID control parameters can be adjusted according to recycling conditions, some schemes increase feed-forward control of a MAP model based on the engine speed and the fuel injection quantity on the basis of the recycling conditions, the feed-forward control mode needs to carry out MAP calibration on the engine speed and the fuel injection quantity, and the calibrated parameters at each time do not necessarily accord with the parameters corresponding to the actual working condition points of the engine, so the error between the output quantity and the target quantity of the feed-forward control mode is large, and the adjustment time is long and the system cannot rapidly enter the target state when controlling the air mass flow.

Disclosure of Invention

The application provides an EGR control method, an EGR control device and electronic equipment, wherein in a feed-forward control link, the error between the opening degree of an EGR valve calculated by a mechanism model and the actually required opening degree of the EGR valve is small, so that the adjusting time of a PID control link is reduced, and the problems that in the process of controlling the air quality flow of an engine by a system, the adjusting time is long and the engine cannot enter a target state quickly are solved.

In a first aspect, the present application provides a method of EGR control, the method comprising:

calculating the opening degree of a first EGR valve according to the mass flow of air entering an air inlet manifold set by a system and the pressure value of the air inlet manifold set by the system;

inputting the difference value between the air mass flow and the current air mass flow entering an air intake manifold into a PID controller to generate a second EGR valve opening degree;

summing the first EGR valve opening and the second EGR valve opening to obtain a third EGR valve opening;

and controlling the mass flow of the air entering the intake manifold according to the opening degree of the third EGR valve.

By the control method, complex calibration is not needed, and the error between the first EGR valve opening calculated by the mechanism model and the actually required EGR valve opening is small, so that the adjusting time of a PID control link is reduced, and the problems that the system cannot enter a target state quickly due to long adjusting time in the process of controlling the air quality flow of the engine are solved.

Further, calculating a first EGR valve opening based on a system set mass airflow into the intake manifold and a system set intake manifold pressure, comprising:

calculating the mass flow of the gas entering the cylinder of the engine according to the pressure value of the intake manifold;

calculating to obtain the exhaust mass flow of the EGR valve according to the air mass flow and the gas mass flow;

and calculating the opening degree of the first EGR valve according to the exhaust mass flow.

Based on the method, the first EGR valve opening degree can be calculated and used for carrying out feedforward control on the opening degree of the GER valve. Because the calculation process is a strict mechanism analysis and does not need to carry out a large amount of calibration, the calculated target EGR valve opening degree of the first EGR valve opening degree corresponding to the current working condition point of the engine is close to the target EGR valve opening degree, and the response time of the system can be reduced.

Further, the controlling the mass flow of air entering the intake manifold according to the third EGR valve opening specifically includes:

adjusting the opening degree of the EGR valve according to the opening degree of the third EGR valve;

and controlling the mass flow of the air entering the intake manifold according to the opening degree of the EGR valve.

Through the mode, the control of the mass flow of the air entering the air inlet manifold is realized.

Further, the mass flow of the gas entering the cylinder of the engine is calculated according to the pressure value of the intake manifold, and the specific calculation formula is as follows:

wherein, W_inFor the gas mass flow, k_inFor conversion factor, n is engine speed, V_engFor engine displacement, R is the gas constant, P_inFor intake manifold pressure, T_inIs the intake manifold temperature.

Further, the exhaust mass flow of the EGR valve is calculated according to the air mass flow and the gas mass flow, and the specific calculation formula is as follows:

wherein, W_EGRFor the purpose of the exhaust gas mass flow,derivative of intake manifold pressure, V_inIs the intake manifold volume.

Further, the first EGR valve opening degree is calculated according to the exhaust mass flow, and the specific calculation formula is as follows:

wherein, U_EGRIs said first EGR valve opening, C_EGRFor EGR valve throttling factor, P_outTo exhaust manifold pressure, T_outIs the exhaust manifold temperature.

In a second aspect, the present application provides an EGR control apparatus, the apparatus comprising:

the calculation module is used for calculating the opening degree of the first EGR valve according to the mass flow of air entering the air inlet manifold set by the system and the pressure value of the air inlet manifold set by the system;

the generating module is used for inputting the difference value between the air mass flow and the current air mass flow entering the intake manifold into a PID controller to generate a second EGR valve opening;

a summing module for summing the first EGR valve opening and the second EGR valve opening to obtain a third EGR valve opening;

and the processing model is used for controlling the air mass flow entering the intake manifold according to the third EGR valve opening degree.

Further, the calculation module is specifically configured to:

calculating the mass flow of the gas entering the cylinder of the engine according to the pressure value of the intake manifold;

calculating to obtain the exhaust mass flow of the EGR valve according to the air mass flow and the gas mass flow;

and calculating the opening degree of the first EGR valve according to the exhaust mass flow.

Further, the processing module is specifically configured to:

adjusting the opening degree of the EGR valve according to the opening degree of the third EGR valve;

and controlling the mass flow of the air entering the intake manifold according to the opening degree of the EGR valve.

In a third aspect, the present application provides an electronic device, comprising:

a memory for storing a computer program;

and a processor for implementing the steps of the EGR control method when executing the computer program stored in the memory.

In a fourth aspect, the present application provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the above EGR control method steps.

In the EGR control method, the air mass flow entering the air inlet manifold set by the system and the pressure value of the air inlet manifold set by the system are analyzed by a mechanism, a first EGR valve opening degree is calculated, the difference value between the current air mass flow entering the air inlet manifold and the air mass flow set by the system is input into a PID controller to generate a second EGR valve opening degree, and a third EGR valve opening degree is obtained by summing the first EGR valve opening degree and the second EGR valve opening degree, wherein the third EGR valve opening degree is used for controlling the size of the EGR valve opening degree, the EGR control method does not need to carry out complex calibration, and the error between the first EGR valve opening degree calculated by the mechanism model and the actually required EGR valve opening degree is small, so that the adjusting time of a PID control link is reduced, and the long adjusting time in the process of controlling the air mass flow of the engine by the system is avoided, the target state cannot be entered quickly.

Meanwhile, the opening degree of the EGR valve is calculated through a mechanism model, and input parameters can be directly set by a system or obtained through system detection, so that the method can be suitable for engines with different displacement and is good in strategy adaptability.

For each of the second to fourth aspects and possible technical effects of each aspect, reference is made to the above description of the possible technical effects of the first aspect or various possible schemes of the first aspect, and repeated description is omitted here.

Drawings

FIG. 1 is a schematic illustration of a diesel engine with EGR as provided herein;

FIG. 2 is a schematic illustration of an EGR exhaust mass flow control provided herein;

FIG. 3 is a schematic diagram of a MAP model relating to engine speed and fuel injection quantity provided by the present application;

FIG. 4 is a flow chart of an EGR control method provided herein;

FIG. 5 is a schematic illustration of an EGR control method provided herein;

FIG. 6 is a schematic structural diagram of an EGR control apparatus provided in the present application;

fig. 7 is a schematic structural diagram of an electronic device provided in the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the present application will be further described in detail with reference to the accompanying drawings. The particular methods of operation in the method embodiments may also be applied to apparatus embodiments or system embodiments. It should be noted that "a plurality" is understood as "at least two" in the description of the present application. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. A is connected with B and can represent: a and B are directly connected and A and B are connected through C. In addition, in the description of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not intended to indicate or imply relative importance nor order to be construed.

The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Referring to FIG. 1, a schematic diagram of a diesel engine with EGR is shown, in FIG. 1, a compressor will absorb air P₀After compression, the compressed gas W is output_cFollowed by compressing the gas W_cAnd exhaust gas W controlled by EGR valve_EGRTogether into the intake manifold, which in turn couples the incoming gases W_cAnd W_EGRAfter being treated, the gas W is output_inImmediately after, gas W_inInto the engine cylinder so that the diesel oil W entering the engine_fCombustion occurs in the engine, generating heat energy to drive the engine in rotation.

Waste generated during the conversion of energy in the engine cylinderGas W_outEnters an exhaust manifold, and then part of gas is controlled by a VGT valve to obtain gas W_VGTGas W_VGTAnd the exhaust gas enters a turbine to realize turbocharging and then is discharged, and the other part of the exhaust gas is continuously recycled after being controlled by an EGR valve.

In the process of recycling the exhaust gas discharged by the exhaust manifold, if the recycled exhaust gas is too much, the oxygen content entering the cylinder is insufficient, the combustion of diesel oil is insufficient, and the power of the engine is further influenced.

Based on the above, FIG. 2 shows a schematic diagram of EGR exhaust mass flow control, which includes two control loops, one being feedforward control and the other being feedback control. The feedforward control is based on the engine speed n and the fuel injection quantity W_fThe EGR valve opening U of the feedforward control is obtained by the MAP model_{Feed forward}(ii) a Feedback control is based on mass air flow W into the intake manifold_cAir mass flow rate W into the intake manifold corresponding to the system setting_{c setting}The difference value is processed by a PID controller to obtain the EGR valve opening U of feedback control_Feedback(ii) a Then, U is put_{Feed forward}And U_FeedbackSumming to obtain EGR valve opening U for controlling exhaust gas circulation utilization_EGR(ii) a Based on valve aperture U_EGRAnd the mass flow of the recycled exhaust gas is controlled, and the mass flow of the air entering the air inlet manifold is further controlled.

In the process, although the PID control parameters in the feedback control link can be adjusted according to the system state to adapt to different engine working conditions, the feedforward control link mainly determines the target engine speed and the target fuel injection quantity based on the MAP model of the engine speed and the fuel injection quantity, the feedforward control mode needs to carry out MAP calibration on the engine speed and the fuel injection quantity at the early stage, and the parameters calibrated at each time do not necessarily accord with the parameters corresponding to the actual working condition points of the engine, so that the output feedforward-controlled EGR is causedValve opening U_FeedbackOpening degree U of EGR valve required by actual_EGRThe error is large, and further, when the system controls the air mass flow, the adjustment time is long, and the target state cannot be rapidly entered.

For example, as shown in fig. 3, which is a MAP model diagram of engine speed and fuel injection quantity, in fig. 3, z coordinate represents an engine operating parameter, x coordinate represents engine speed, y coordinate represents fuel injection quantity, and each black dot represents a specific operating point of the engine. When the engine working condition parameter is k1, the rotating speed of the engine is n1 and the fuel injection quantity is W through repeated tests and debugging_f1(ii) a When the engine working condition parameter is k2, the rotating speed of the engine is n2 and the fuel injection quantity is W through repeated tests and debugging_f2(ii) a And after calibrating the parameters corresponding to all the specific working condition points, further fitting all the working condition points to obtain an MAP model of the working condition parameters of the engine, which are related to the rotating speed and the fuel injection quantity of the engine. Therefore, the MAP model is obtained mainly based on a large number of tests and debugging and is completed by fitting the special working condition points, and a large number of errors exist in the process, so that the parameters obtained by inquiring based on the MAP model are inaccurate.

In order to solve the above problems, the present application provides an EGR control method, in which a feedforward control link in the control method is improved, that is, a mass flow rate of air entering an intake manifold set by a system and a pressure value of the intake manifold set by the system are calculated through a mechanism model to obtain an EGR valve opening degree under feedforward control.

The mechanism model mainly expresses the physical characteristics of the system through a mathematical formula, while the MAP model mainly carries out manual calibration on parameters under certain specific working conditions in a test mode, and the calibration parameter accuracy is not high. Therefore, compared with the EGR valve opening degree of feedforward control obtained based on the MAP model, the error between the EGR valve opening degree of the feedforward control calculated by the mechanism model and the actually required EGR valve opening degree is relatively small, so that the problem that the system cannot quickly enter a target state due to long adjusting time in the process of controlling the air mass flow of the engine is solved. The method and the device in the embodiment of the application are based on the same technical concept, and because the principles of the problems solved by the method and the device are similar, the device and the embodiment of the method can be mutually referred, and repeated parts are not repeated.

As shown in fig. 4, a flowchart of an EGR control method provided in the present application specifically includes the following steps:

s41, calculating a first EGR valve opening according to the mass flow of air entering an air inlet manifold set by the system and the pressure value of the air inlet manifold set by the system;

in the embodiment of the present application, a first EGR valve opening degree may be calculated according to a system-set mass airflow entering an intake manifold and a system-set pressure value of the intake manifold, where the first EGR valve opening degree represents an EGR valve opening degree obtained through a feed-forward control link. The specific calculation method is as follows:

calculating the mass flow of the gas entering the engine cylinder according to the pressure value of the intake manifold, wherein the specific calculation formula is as follows:

in the formula (1), W_inFor the gas mass flow, k_inFor conversion factor, n is engine speed, V_engFor engine displacement, R is the gas constant, P_inIntake manifold pressure, intake manifold temperature.

Further, according to the air mass flow and the gas mass flow, calculating to obtain the exhaust mass flow of the EGR valve, wherein the specific calculation formula is as follows:

in the formula (2), W_EGRFor the purpose of the exhaust gas mass flow,is the derivative of said preset pressure, V_inIs the intake manifold volume.

Further, according to the exhaust mass flow, the opening degree of the first EGR valve is calculated, and the specific calculation formula is as follows:

in the formula (3), U_EGRIs said first EGR valve opening, C_EGRFor EGR valve throttling factor, P_outTo exhaust manifold pressure, T_outIs the exhaust manifold temperature.

Based on the method, the first EGR valve opening degree is calculated and used for carrying out feedforward control on the opening degree of the GER valve. The physical characteristics of the system are expressed by a mathematical formula mainly through mechanism analysis, and the MAP model manually calibrates parameters under certain specific working conditions mainly through a test mode, so that the calibrated parameters are not high in accuracy. Therefore, compared with the EGR valve opening obtained based on the MAP model, the method provided by the application can be used for calculating that the first EGR valve opening is close to the target EGR valve opening corresponding to the current operating point of the engine, so that the problems that the system is long in adjusting time and cannot enter the target state quickly in the process of controlling the air mass flow of the engine are solved.

S42, inputting the difference value between the air mass flow and the current air mass flow entering the air intake manifold into a PID controller, and generating a second EGR valve opening;

in the embodiment of the application, the air mass flow is a target reference value, a difference value between the target reference value and the current air mass flow fed back to the intake manifold is input to the PID controller, and a second EGR valve opening degree is generated, where the second EGR valve opening degree is used for compensating the first EGR valve opening degree, so that a difference between the current air mass flow fed into the intake manifold and the target reference value can be reduced. Therefore, by the PID control, the current mass air flow into the intake manifold can be made to approach the target reference value until the system is in a steady state.

S43, summing the first EGR valve opening and the second EGR valve opening to obtain a third EGR valve opening;

in the embodiment of the application, the first EGR valve opening degree and the second EGR valve opening degree are summed to obtain a third EGR valve opening degree, and the EGR system controls the size of the EGR valve opening degree according to the third EGR valve opening degree.

S44, controlling mass airflow into the intake manifold based on the third EGR valve opening.

In the embodiment of the present application, the mass flow of air entering the intake manifold is controlled according to the third EGR valve opening degree, specifically: and controlling the opening degree of the EGR valve according to the opening degree of the third EGR valve, wherein the content of the exhaust gas entering an engine cylinder can be further controlled by controlling the opening degree of the EGR valve, and the control of the mass flow of the air entering an air inlet manifold is further realized.

In the EGR control method, the air mass flow entering the air inlet manifold set by the system and the pressure value of the air inlet manifold set by the system are subjected to mechanism analysis to calculate the opening degree of a first EGR valve, the difference value between the current air mass flow entering the air inlet manifold and the air mass flow set by the system is used for generating the opening degree of a second EGR valve through a PID (proportion integration differentiation) controller, and the opening degree of a third EGR valve obtained by summing the opening degree of the first EGR valve and the opening degree of the second EGR valve is used for controlling the opening degree of the EGR valve, the EGR control method does not need to carry out complicated calibration, and the error between the opening degree of the first EGR valve calculated through a mechanism model and the actually required opening degree of the EGR valve is small, so that the adjustment time of a PID control link is reduced, and the air mass flow control process of an engine by the system is avoided, long regulating time and can not enter the target state quickly.

Meanwhile, the opening degree of the EGR valve is calculated through a mechanism model, and input parameters can be directly set by a system or obtained through system detection, so that the method can be suitable for engines with different displacement and is good in strategy adaptability.

Further, in order to explain the EGR control method provided by the present application in more detail, the method provided by the present application is described in detail below through specific application scenarios.

As shown in fig. 5, a schematic diagram of an EGR control method is shown, which includes two control segments, one being feed-forward control and the other being feedback control.

In fig. 5, the feedforward control is an open-loop control based on a mechanism model, and mainly includes 3 mechanism models, where the first mechanism model is:

wherein, C_EGRFor EGR valve throttling coefficient, R is the gas constant, P_{in setting}Intake manifold pressure value, P, set for the system_outTo exhaust manifold pressure, T_outIs the exhaust manifold temperature.

The first mechanism model has an input parameter P_{in setting}、P_outAnd T_outWherein P is_outCan be obtained by a sensor, T_outCan be based on P_outAre calculated.

In fig. 4, the second mechanism model is:

wherein the content of the first and second substances,derivative of intake manifold pressure, T_inIntake manifold temperature, input parameter of the second mechanism model being P_inAnd T_inWherein P is_inGet the set value P of the system_{in setting}，T_inMay be acquired by a sensor.

In fig. 4, the third mechanism model is:

wherein k is_inFor conversion factor, n is engine speed, V_engIs the engine displacement. The input parameter of the third mechanism model is P_{in setting}、T_inAnd n, wherein n and T_inMay be acquired by a sensor.

Further calculating to obtain the EGR valve opening U of the feedforward control based on the 3 mechanical models_{Feed forward}The calculation formula is as follows:

wherein, W_{c setting}The air mass flow into the intake manifold is set for the system.

Further, in FIG. 5, the feedback control is a closed loop control based on a PID controller, in which the system-set mass flow W of air into the intake manifold is controlled in a feedback control loop_{c setting}As a reference value, the current air mass flow W fed back by the system is obtained in real time_cAnd W is_cAnd W_{c setting}The difference value between the two values is input into a PID controller to generate the EGR valve opening U of feedback control_Feedback。

Further, the EGR valve opening U is controlled by feedforward_{Feed forward}EGR valve opening U controlled by feedback_FeedbackCarrying out summation calculation to obtain the total EGR valve opening U for controlling the EGR valve opening_EGRBased on U_EGRAnd the EGR device controls the size of the EGR valve, realizes the control of the content of the recycled exhaust gas and further realizes the control of the mass flow of the air entering the air inlet manifold.

In the process, the feedforward control link is mainly to calculate the opening U of the EGR valve controlled in a feedforward mode through a mechanism model_{Feed forward}The control method does not need to carry out complicated calibration, and the error between the EGR valve opening calculated by the mechanism model and the actually required EGR valve opening is smaller, thereby reducing the adjusting time of a PID control linkThe problem that the system cannot enter a target state quickly due to long adjusting time in the process of controlling the air mass flow of the engine is solved.

Meanwhile, the opening degree of the EGR valve is calculated through a mechanism model, and input parameters can be directly set by a system or obtained through system detection, so that the method can be suitable for engines with different displacement and is good in strategy adaptability.

Based on the same inventive concept, an embodiment of the present application further provides an EGR control device, as shown in fig. 6, which is a schematic structural diagram of the EGR control device in the present application, and the EGR control device includes:

the calculation module 61 is used for calculating the opening degree of the first EGR valve according to the mass flow of air entering the air inlet manifold set by the system and the pressure value of the air inlet manifold set by the system;

a generating module 62 for inputting a difference between the mass airflow and a current mass airflow into the intake manifold to a PID controller to generate a second EGR valve opening;

a summing module 63 configured to sum the first EGR valve opening and the second EGR valve opening to obtain a third EGR valve opening;

a process model 64 for controlling the mass air flow into the intake manifold based on the third EGR valve opening.

Further, the calculating module 61 is specifically configured to:

calculating the mass flow of the gas entering the cylinder of the engine according to the pressure value of the intake manifold;

calculating to obtain the exhaust mass flow of the EGR valve according to the air mass flow and the gas mass flow;

and calculating the opening degree of the first EGR valve according to the exhaust mass flow.

Further, the processing module 64 is specifically configured to:

adjusting the opening degree of the EGR valve according to the opening degree of the third EGR valve;

and controlling the mass flow of the air entering the intake manifold according to the opening degree of the EGR valve.

Based on the EGR control device, the air mass flow entering the air intake manifold set by the system and the pressure value of the air intake manifold set by the system are subjected to mechanism analysis to calculate to obtain a first EGR valve opening, the difference value between the current air mass flow entering the air intake manifold and the air mass flow set by the system is used for generating a second EGR valve opening through a PID (proportion integration differentiation) controller, and a third EGR valve opening obtained by summing the first EGR valve opening and the second EGR valve opening is used for controlling the size of the EGR valve opening, the EGR control method does not need to carry out complicated calibration, and the error between the first EGR valve opening calculated through a mechanism model and the actually required EGR valve opening is small, so that the adjustment time of a PID control link is reduced, and the air mass flow control process of the engine by the system is avoided, long regulating time and can not enter the target state quickly.

Meanwhile, the opening degree of the EGR valve is calculated through a mechanism model, and input parameters can be directly set by a system or obtained through system detection, so that the method can be suitable for engines with different displacement and is good in strategy adaptability.

Based on the same inventive concept, an embodiment of the present application further provides an electronic device, where the electronic device can implement the functions of the foregoing EGR control method and apparatus, and with reference to fig. 7, the electronic device includes:

at least one processor 71 and a memory 72 connected to the at least one processor 71, in this embodiment, a specific connection medium between the processor 71 and the memory 72 is not limited, and fig. 7 illustrates an example where the processor 71 and the memory 72 are connected through a bus 70. The bus 70 is shown in fig. 7 by a thick line, and the connection between other components is merely illustrative and not intended to be limiting. The bus 70 may be divided into an address bus, a data bus, a control bus, etc., and is shown in fig. 7 with only one thick line for ease of illustration, but does not represent only one bus or type of bus. Alternatively, the processor 71 may also be referred to as a controller, without limitation to name a few.

In the present embodiment, the memory 72 stores instructions executable by the at least one processor 71, and the at least one processor 71 may execute the EGR control method discussed above by executing the instructions stored in the memory 72. The processor 71 may implement the functions of the various modules in the apparatus shown in fig. 6.

The processor 71 is a control center of the apparatus, and may connect various parts of the entire control device by using various interfaces and lines, and perform various functions of the apparatus and process data by operating or executing instructions stored in the memory 72 and calling data stored in the memory 72, thereby performing overall monitoring of the apparatus.

In one possible design, processor 71 may include one or more processing units, and processor 71 may integrate an application processor, which primarily handles operating systems, user interfaces, application programs, and the like, and a modem processor, which primarily handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 71. In some embodiments, the processor 71 and the memory 72 may be implemented on the same chip, or in some embodiments, they may be implemented separately on separate chips.

The processor 71 may be a general-purpose processor, such as a Central Processing Unit (CPU), digital signal processor, application specific integrated circuit, field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the like, that implements or performs the methods, steps, and logic blocks disclosed in embodiments of the present application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the EGR control method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in the processor.

Memory 72, which is a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The Memory 72 may include at least one type of storage medium, and may include, for example, a flash Memory, a hard disk, a multimedia card, a card-type Memory, a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a Programmable Read Only Memory (PROM), a Read Only Memory (ROM), a charge Erasable Programmable Read Only Memory (EEPROM), a magnetic Memory, a magnetic disk, an optical disk, and the like. The memory 72 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory 72 in the embodiments of the present application may also be circuitry or any other device capable of performing a storage function for storing program instructions and/or data.

The processor 71 is programmed to solidify the codes corresponding to the EGR control method described in the foregoing embodiment into the chip, so that the chip can execute the steps of the EGR control method of the embodiment shown in fig. 4 when running. How to program the processor 71 is well known to those skilled in the art and will not be described in detail here.

Based on the same inventive concept, the present application also provides a storage medium storing computer instructions, which when executed on a computer, cause the computer to execute the EGR control method discussed above.

In some possible embodiments, the various aspects of the EGR control method provided herein may also be implemented in the form of a program product comprising program code means for causing a control apparatus to carry out the steps of the EGR control method according to various exemplary embodiments of the present application described above in the present description, when the program product is run on a device.

As will be appreciated by one skilled in the art, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.