EGR control method, device and electronic equipment

Abstract

The application discloses an EGR control method, device and electronic equipment, and the method comprises the following steps: calculating a first EGR valve opening degree according to the system set air mass flow entering an intake manifold and the system set intake manifold pressure value; inputting the difference 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 degree and the second EGR valve opening degree to obtain a third EGR valve opening degree; and controlling the air mass flow entering the intake manifold according to the third EGR valve opening degree. Based on the above method, complex calibration is not required, and the error between the first EGR valve opening degree calculated by the mechanism model and the actual required EGR valve opening degree is small, so that the adjustment time of the PID control link is reduced, the problem that the system takes a long time to regulate and control the air mass flow entering the cylinder and cannot quickly enter the target state is avoided.

Description

Technical Field

[0001] This application relates to the field of engine control technology, and in particular to an EGR control method, device and electronic equipment. Background Technology

[0002] To meet increasingly stringent engine emission requirements, exhaust gas recirculation (EGR) systems are typically installed in engines. This system returns a portion of the exhaust gas to the intake manifold, where it mixes with fresh air and re-enters the cylinders. This reduces the oxygen content in the intake air, thereby lowering combustion temperature and reducing emissions. However, if too much exhaust gas is recirculated, the oxygen content entering the cylinders may fall below the required level, impacting engine power. Therefore, controlling the EGR valve opening based on the engine's actual operating conditions to regulate the mass flow rate of the recirculated exhaust gas is crucial for ensuring normal engine operation while minimizing emissions.

[0003] To address the aforementioned issues, traditional solutions employ a PID controller to achieve closed-loop control of the recycled air mass flow rate. The PID control parameters can be adjusted based on the recycling conditions. Some solutions further incorporate feedforward control based on a MAP model of engine speed and fuel injection quantity. This feedforward control method requires MAP calibration for engine speed and fuel injection quantity, and the calibrated parameters may not always correspond to the actual operating points of the engine. Consequently, the output of this feedforward control method has a large error compared to the target value, further resulting in a long adjustment time and an inability to quickly reach the target state when controlling the air mass flow rate. Summary of the Invention

[0004] This application provides an EGR control method, device, and electronic equipment. In the feedforward control stage, the opening degree of the EGR valve calculated using the mechanism model has a small error compared with the actual required opening degree of the EGR valve, thereby reducing the adjustment time of the PID control stage and avoiding the problem of long adjustment time and inability to quickly enter the target state during the control of engine air mass flow.

[0005] In a first aspect, this application provides an EGR control method, the method comprising:

[0006] The opening degree of the first EGR valve is calculated based on the system-set mass flow rate of air entering the intake manifold and the system-set intake manifold pressure value.

[0007] The difference between the air mass flow rate and the current air mass flow rate entering the intake manifold is input into the PID controller to generate the second EGR valve opening.

[0008] The opening degree of the first EGR valve is summed with the opening degree of the second EGR valve to obtain the opening degree of the third EGR valve;

[0009] The mass flow rate of the air entering the intake manifold is controlled according to the opening degree of the third EGR valve.

[0010] The above control method eliminates the need for complex calibration, and the error between the first EGR valve opening calculated by the mechanism model and the actual required EGR valve opening is small. This reduces the adjustment time of the PID control loop and avoids the problem of long adjustment time and inability to quickly reach the target state during the control of engine air mass flow.

[0011] Furthermore, the calculation of the first EGR valve opening based on the system-set air mass flow rate entering the intake manifold and the system-set intake manifold pressure includes:

[0012] Calculate the mass flow rate of the gas entering the engine cylinder based on the intake manifold pressure value;

[0013] The exhaust mass flow rate of the EGR valve is calculated based on the air mass flow rate and the gas mass flow rate.

[0014] The opening degree of the first EGR valve is calculated based on the exhaust mass flow rate.

[0015] Based on the above method, the first EGR valve opening can be calculated and used for feedforward control of the GER valve opening. Since the above calculation process is a rigorous mechanistic analysis and does not require extensive calibration, the calculated first EGR valve opening is close to the target EGR valve opening corresponding to the current engine operating point, which can reduce the system response time.

[0016] Furthermore, controlling the mass flow rate of the air entering the intake manifold based on the opening degree of the third EGR valve specifically includes:

[0017] Adjust the opening of the EGR valve according to the opening degree of the third EGR valve;

[0018] The mass flow rate of air entering the intake manifold is controlled by adjusting the opening of the EGR valve.

[0019] The above method enables control of the mass flow rate of air entering the intake manifold.

[0020] Furthermore, the mass flow rate of the gas entering the engine cylinder is calculated based on the intake manifold pressure value, and the specific calculation formula is as follows:

[0021]

[0022] Among them, W in k is the mass flow rate of the gas. in Here is the conversion factor, n is the engine speed, and V is the conversion factor. eng Where R is the engine displacement, P is the gas constant, and P is the displacement of the engine. in For intake manifold pressure, T in This refers to the intake manifold temperature.

[0023] Furthermore, the exhaust mass flow rate of the EGR valve is calculated based on the air mass flow rate and the gas mass flow rate, using the following specific formula:

[0024]

[0025] Among them, W EGR The exhaust mass flow rate is... V is the derivative of the intake manifold pressure. in This refers to the volume of the intake manifold.

[0026] Furthermore, the opening degree of the first EGR valve is calculated based on the exhaust mass flow rate, and the specific calculation formula is as follows:

[0027]

[0028] Among them, U EGR C represents the opening degree of the first EGR valve. EGR P is the throttling coefficient of the EGR valve. out T is the exhaust manifold pressure. out This refers to the exhaust manifold temperature.

[0029] Secondly, this application provides an EGR control device, the device comprising:

[0030] The calculation module is used to calculate the opening degree of the first EGR valve based on the system-set mass flow rate of air entering the intake manifold and the system-set intake manifold pressure value.

[0031] The generation module is used to input the difference between the air mass flow rate and the current air mass flow rate entering the intake manifold into the PID controller to generate the second EGR valve opening.

[0032] The summation module is used to sum the first EGR valve opening and the second EGR valve opening to obtain the third EGR valve opening;

[0033] A processing model is used to control the mass flow rate of air entering the intake manifold based on the opening degree of the third EGR valve.

[0034] Furthermore, the computing module is specifically used for:

[0035] Calculate the mass flow rate of the gas entering the engine cylinder based on the intake manifold pressure value;

[0036] The exhaust mass flow rate of the EGR valve is calculated based on the air mass flow rate and the gas mass flow rate.

[0037] The opening degree of the first EGR valve is calculated based on the exhaust mass flow rate.

[0038] Furthermore, the processing module is specifically used for:

[0039] Adjust the opening of the EGR valve according to the opening degree of the third EGR valve;

[0040] The mass flow rate of air entering the intake manifold is controlled by adjusting the opening of the EGR valve.

[0041] Thirdly, this application provides an electronic device, comprising:

[0042] Memory, used to store computer programs;

[0043] When the processor executes the computer program stored in the memory, it implements the above-described EGR control method steps.

[0044] Fourthly, this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described EGR control method steps.

[0045] In the aforementioned EGR control method, the system-set air mass flow rate entering the intake manifold and the system-set intake manifold pressure are used to calculate the first EGR valve opening through mechanism analysis. The difference between the current air mass flow rate entering the intake manifold and the system-set air mass flow rate is input into the PID controller to generate the second EGR valve opening. The first and second EGR valve openings are then summed to obtain the third EGR valve opening, which is used to control the size of the EGR valve opening. This EGR control method does not require complex calibration, and the error between the first EGR valve opening calculated by the mechanism model and the actual required EGR valve opening is small. This reduces the adjustment time of the PID control loop and avoids the problem of long adjustment time and inability to quickly reach the target state during the system's control of engine air mass flow rate.

[0046] Meanwhile, the EGR valve opening is calculated through a mechanistic model. The input parameters can be directly set by the system or obtained through system detection, which can adapt to engines of different displacements and has good strategy adaptability.

[0047] The technical effects of each of the second to fourth aspects mentioned above, as well as the technical effects that each aspect may achieve, are described above with reference to the technical effects that can be achieved for the first aspect or the various possible solutions in the first aspect, and will not be repeated here. Attached Figure Description

[0048] Figure 1 A schematic diagram of a diesel engine with EGR provided for this application;

[0049] Figure 2 A schematic diagram of EGR exhaust gas mass flow control provided in this application;

[0050] Figure 3 A schematic diagram of a MAP model relating to engine speed and fuel injection quantity is provided in this application;

[0051] Figure 4 A flowchart of an EGR control method provided in this application;

[0052] Figure 5 A schematic diagram of an EGR control method provided in this application;

[0053] Figure 6 This application provides a schematic diagram of the structure of an EGR control device;

[0054] Figure 7 This is a schematic diagram of an electronic device structure provided in this application. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The specific operational methods in the method embodiments can also be applied to the device embodiments or system embodiments. It should be noted that in the description of this application, "multiple" is understood as "at least two". "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. A connected to B can represent: A and B directly connected, and A and B connected through C. Furthermore, in the description of this application, terms such as "first" and "second" are used only for distinguishing the purpose of description and should not be construed as indicating or implying relative importance or order.

[0056] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0057] like Figure 1 The image shown is a schematic diagram of a diesel engine with EGR. Figure 1 In the process, the compressor compresses the absorbed air P0 and outputs compressed gas W. c Then compressed gas W c And exhaust gas W controlled by EGR valve EGR They enter the intake manifold together, and then the intake manifold directs the incoming gas W... c and W EGR After processing, the output gas W in Immediately afterwards, gas W in The diesel fuel W enters the engine cylinders, causing the diesel fuel to enter the engine. f Combustion inside the engine generates heat energy to drive the engine's rotation.

[0058] During the energy conversion process within the engine cylinder, the generated exhaust gas W out The gas enters the exhaust manifold, and then a portion of the gas is controlled by the VGT valve to obtain gas W. VGT gas W VGT After entering the turbine for turbocharging, the exhaust gas is discharged, while another portion of the exhaust gas is recycled after being controlled by the EGR valve.

[0059] During the exhaust gas recirculation process, if too much exhaust gas is recirculated, it will lead to insufficient oxygen content entering the cylinder, resulting in incomplete combustion of diesel fuel and thus affecting engine power. Therefore, the opening of the EGR valve is controlled according to the actual operating conditions of the engine to control the mass flow rate of the recirculated exhaust gas, ensuring that the system can reduce exhaust emissions while the engine can still operate normally.

[0060] Based on the above situation, such as Figure 2 The diagram shows a schematic of EGR exhaust gas mass flow control, including two control loops: feedforward control and feedback control. The feedforward control is based on engine speed n and fuel injection quantity W. f The MAP model is used to obtain the EGR valve opening U of the feedforward control. 前馈 Feedback control is based on the mass flow rate W of the air entering the intake manifold. c The system-defined air mass flow rate W entering the intake manifold c设定 The difference between them is used by the PID controller to obtain the EGR valve opening U for feedback control. 反馈 ; then, U 前馈 with U 反馈 Summing these values ​​yields the EGR valve opening U used to control waste gas recirculation. EGR Based on valve opening degree U EGRThis controls the mass flow rate of the recycled exhaust gas, further enabling control of the mass flow rate of the air entering the intake manifold.

[0061] In the above process, although the PID control parameters in the feedback control loop can be adjusted according to the system state to adapt to different engine operating conditions, the feedforward control loop mainly determines the target engine speed and target fuel injection quantity based on the MAP model of engine speed and fuel injection quantity. This feedforward control method requires MAP calibration of engine speed and fuel injection quantity in the early stage, and the parameters calibrated each time may not match the parameters corresponding to the actual engine operating point, resulting in the EGR valve opening U of the output feedforward control. 反馈 The actual required EGR valve opening U EGR The large error between them further leads to a long adjustment time when the system controls the air mass flow rate, and it cannot quickly enter the target state.

[0062] For example, such as Figure 3 The image shown is a schematic diagram of a MAP model relating engine speed and fuel injection quantity. Figure 3 In the diagram, the z-axis represents the engine operating parameters, the x-axis represents the engine speed, and the y-axis represents the fuel injection quantity. Each black dot represents a specific operating point of the engine. With the engine operating parameters at k1, after repeated testing and adjustments, the engine speed was calibrated to be n1, and the fuel injection quantity to be W. f1 With engine operating parameters at k2, after repeated tests and adjustments, the engine speed was calibrated to be n2 and the fuel injection quantity to be W. f2 After calibrating the parameters corresponding to all specific operating points, the parameters of all operating points are further fitted to obtain a MAP model of engine operating parameters with respect to engine speed and fuel injection quantity. It can be seen that obtaining the MAP model is mainly based on a large number of experiments and adjustments, and fitting specific operating points. This process involves a significant amount of error; therefore, the parameters obtained based on the MAP model are inaccurate.

[0063] To address the aforementioned issues, this application provides an EGR control method that improves the feedforward control mechanism in the above-mentioned control method. Specifically, the method uses a mechanistic model to calculate the EGR valve opening for feedforward control based on the system-set mass flow rate of air entering the intake manifold and the system-set pressure value of the intake manifold.

[0064] Since the mechanistic model primarily expresses the physical characteristics of the system through mathematical formulas, while the MAP model mainly relies on experiments to manually calibrate parameters under specific operating conditions, the accuracy of the calibrated parameters is not high. Therefore, compared to the EGR valve opening obtained from the feedforward control based on the MAP model, the error between the EGR valve opening calculated by the mechanistic model and the actual required EGR valve opening is relatively small. This avoids the problem of long adjustment time and inability to quickly reach the target state during the system's control of engine air mass flow. The methods and apparatus described in this application are based on the same technical concept. Since the principles by which the methods and apparatus solve the problems are similar, embodiments of the apparatus and methods can be referred to interchangeably, and repeated details will not be repeated.

[0065] like Figure 4 The diagram shown is a flowchart of an EGR control method provided in this application, which specifically includes the following steps:

[0066] S41, calculate the opening degree of the first EGR valve based on the system-set mass flow rate of air entering the intake manifold and the system-set intake manifold pressure value;

[0067] In this embodiment, the first EGR valve opening can be calculated based on the system-set air mass flow rate entering the intake manifold and the system-set intake manifold pressure value. The first EGR valve opening represents the EGR valve opening obtained through the feedforward control loop. The specific calculation method is as follows:

[0068] The mass flow rate of gas entering the engine cylinders is calculated based on the intake manifold pressure value. The specific calculation formula is as follows:

[0069]

[0070] In formula (1), W in k is the mass flow rate of the gas. in Here is the conversion factor, n is the engine speed, and V is the conversion factor. eng Where R is the engine displacement, P is the gas constant, and P is the displacement of the engine. in These represent the intake manifold pressure and intake manifold temperature.

[0071] Furthermore, based on the air mass flow rate and gas mass flow rate, the exhaust mass flow rate of the EGR valve is calculated. The specific calculation formula is as follows:

[0072]

[0073] In formula (2), W EGR The exhaust mass flow rate is... V is the derivative of the preset pressure. in This refers to the volume of the intake manifold.

[0074] Furthermore, based on the exhaust mass flow rate, the opening degree of the first EGR valve is calculated, and the specific calculation formula is as follows:

[0075]

[0076] In formula (3), U EGR C represents the opening degree of the first EGR valve. EGR P is the throttling coefficient of the EGR valve. out T is the exhaust manifold pressure. out This refers to the exhaust manifold temperature.

[0077] Based on the above method, the first EGR valve opening is calculated and used for feedforward control of the GER valve opening. Since the above process mainly expresses the physical characteristics of the system through mathematical formulas via mechanistic analysis, while the MAP model mainly relies on experiments to manually calibrate parameters under specific operating conditions, the accuracy of the calibrated parameters is not high. Therefore, compared to the EGR valve opening obtained based on the MAP model, the first EGR valve opening calculated using the method provided in this application is closer to the target EGR valve opening corresponding to the current engine operating point, thus avoiding the problem of long adjustment time and inability to quickly reach the target state during the system's control of engine air mass flow.

[0078] S42, input the difference between the air mass flow rate and the current air mass flow rate entering the intake manifold into the PID controller to generate the second EGR valve opening;

[0079] In this embodiment, the air mass flow rate is a target reference value. The difference between the target reference value and the current air mass flow rate fed back from the intake manifold is input to the PID controller to generate a second EGR valve opening. Here, the second EGR valve opening is used to compensate for the first EGR valve opening, thereby reducing the gap between the current air mass flow rate entering the intake manifold and the target reference value. Therefore, through PID control, the current air mass flow rate entering the intake manifold can be made to continuously approach the target reference value until the system reaches a stable state.

[0080] S43, sum the opening degree of the first EGR valve and the opening degree of the second EGR valve to obtain the opening degree of the third EGR valve;

[0081] In this embodiment, the opening degree of the first EGR valve is summed with the opening degree of the second EGR valve to obtain the opening degree of the third EGR valve. The EGR system controls the opening degree of the EGR valve according to the opening degree of the third EGR valve.

[0082] S44 controls the mass flow rate of air entering the intake manifold based on the opening degree of the third EGR valve.

[0083] In this embodiment, the mass flow rate of air entering the intake manifold is controlled according to the opening degree of the third EGR valve. Specifically, the opening degree of the EGR valve is controlled according to the opening degree of the third EGR valve. By controlling the opening degree of the EGR valve, the exhaust gas content entering the engine cylinder can be controlled, thereby further controlling the mass flow rate of air entering the intake manifold.

[0084] In the aforementioned EGR control method, the system-set air mass flow rate entering the intake manifold and the system-set intake manifold pressure are used to calculate the first EGR valve opening through mechanism analysis. The difference between the current air mass flow rate entering the intake manifold and the system-set air mass flow rate is used by a PID controller to generate the second EGR valve opening. The first and second EGR valve openings are then summed to obtain the third EGR valve opening, which is used to control the size of the EGR valve opening. This EGR control method does not require complex calibration, and the error between the first EGR valve opening calculated by the mechanism model and the actual required EGR valve opening is small. This reduces the adjustment time of the PID control loop, thereby avoiding the problem of long adjustment time and inability to quickly reach the target state during the system's control of engine air mass flow rate.

[0085] Meanwhile, the EGR valve opening is calculated through a mechanistic model. The input parameters can be directly set by the system or obtained through system detection, which can adapt to engines of different displacements and has good strategy adaptability.

[0086] Furthermore, to elaborate on the EGR control method provided in this application, the following detailed explanation of the method will be provided through specific application scenarios.

[0087] like Figure 5 The diagram shown is a schematic of an EGR control method, which includes two control loops: feedforward control and feedback control.

[0088] exist Figure 5 In this context, feedforward control is an open-loop control based on mechanistic models, mainly comprising three mechanistic models. The first mechanistic model is:

[0089]

[0090] Among them, C EGR Where R is the throttling coefficient of the EGR valve, P is the gas constant, and P is the flow rate coefficient of the EGR valve. in设定 The intake manifold pressure value set for the system, P outT is the exhaust manifold pressure. out This refers to the exhaust manifold temperature.

[0091] The first mechanism model has input parameters P. in设定 P out and T out , where P out T can be obtained through sensors. out It can be based on P out This can be calculated.

[0092] exist Figure 4 In the second mechanism model, it is:

[0093]

[0094] in, T is the derivative of the intake manifold pressure. in Intake manifold temperature, the input parameter for the second mechanism model is P in and T in , where P in Take the system's setpoint P in设定 T in This can be obtained through sensors.

[0095] exist Figure 4 In the middle, the third mechanism model is:

[0096]

[0097] Where, k in Here is the conversion factor, n is the engine speed, and V is the conversion factor. eng The engine displacement is P. The input parameter for the third mechanism model is P. in设定 T in and n, where n and T in This can be obtained through sensors.

[0098] Based on the above three mechanism models, the EGR valve opening U of the feedforward control is further calculated. 前馈 The calculation formula is:

[0099]

[0100] Among them, W c设定 The mass flow rate of air entering the intake manifold as set by the system.

[0101] Furthermore, in Figure 5 In this system, feedback control is a closed-loop control based on a PID controller. In the feedback control loop, the system-set mass flow rate W of the air entering the intake manifold is used. c设定 As a reference value, the current air mass flow rate W is obtained in real time from the system feedback.c and W c With W c设定 The difference between the values ​​is input to the PID controller to generate the EGR valve opening U for feedback control. 反馈 .

[0102] Furthermore, by controlling the opening degree U of the EGR valve with feedforward control 前馈 With feedback control of EGR valve opening U 反馈 The summation calculation yields the total EGR valve opening U used to control the size of the EGR valve opening. EGR Based on U EGR The EGR device controls the size of the EGR valve to control the content of recirculated exhaust gas, and further controls the mass flow rate of air entering the intake manifold.

[0103] In the above process, the feedforward control mainly calculates the EGR valve opening U of the feedforward control through a mechanism model. 前馈 This control method does not require complex calibration, and the error between the EGR valve opening calculated by the mechanism model and the actual required EGR valve opening is small, thereby reducing the adjustment time of the PID control link and avoiding the problem of long adjustment time and inability to quickly enter the target state during the control of engine air mass flow.

[0104] Meanwhile, the EGR valve opening is calculated through a mechanistic model. The input parameters can be directly set by the system or obtained through system detection, which can adapt to engines of different displacements and has good strategy adaptability.

[0105] Based on the same inventive concept, this application also provides an EGR control device, such as... Figure 6 The diagram shown is a structural schematic of an EGR control device according to this application. The device includes:

[0106] The calculation module 61 is used to calculate the opening degree of the first EGR valve based on the mass flow rate of air entering the intake manifold set by the system and the intake manifold pressure value set by the system.

[0107] The generation module 62 is used to input the difference between the air mass flow rate and the current air mass flow rate entering the intake manifold into the PID controller to generate the second EGR valve opening.

[0108] The summation module 63 is used to sum the first EGR valve opening and the second EGR valve opening to obtain the third EGR valve opening;

[0109] Processing model 64 is used to control the mass flow rate of the air entering the intake manifold based on the opening degree of the third EGR valve.

[0110] Furthermore, the calculation module 61 is specifically used for:

[0111] Calculate the mass flow rate of the gas entering the engine cylinder based on the intake manifold pressure value;

[0112] The exhaust mass flow rate of the EGR valve is calculated based on the air mass flow rate and the gas mass flow rate.

[0113] The opening degree of the first EGR valve is calculated based on the exhaust mass flow rate.

[0114] Furthermore, the processing module 64 is specifically used for:

[0115] Adjust the opening of the EGR valve according to the opening degree of the third EGR valve;

[0116] The mass flow rate of air entering the intake manifold is controlled by adjusting the opening of the EGR valve.

[0117] Based on the above-mentioned EGR control device, the system-set air mass flow rate entering the intake manifold and the system-set intake manifold pressure value are used to calculate the first EGR valve opening through mechanism analysis. The difference between the current air mass flow rate entering the intake manifold and the system-set air mass flow rate is used by the PID controller to generate the second EGR valve opening. The first and second EGR valve openings are summed to obtain the third EGR valve opening, which is used to control the size of the EGR valve opening. This EGR control method does not require complex calibration, and the error between the first EGR valve opening calculated by the mechanism model and the actual required EGR valve opening is small. This reduces the adjustment time of the PID control loop and avoids the problem of long adjustment time and inability to quickly reach the target state during the system's control of engine air mass flow rate.

[0118] Meanwhile, the EGR valve opening is calculated through a mechanistic model. The input parameters can be directly set by the system or obtained through system detection, which can adapt to engines of different displacements and has good strategy adaptability.

[0119] Based on the same inventive concept, this application also provides an electronic device that can realize the functions of the aforementioned EGR control method device. (Refer to...) Figure 7 The electronic device includes:

[0120] At least one processor 71 and a memory 72 connected to at least one processor 71. In this embodiment, the specific connection medium between the processor 71 and the memory 72 is not limited. Figure 7The example shown is the connection between processor 71 and memory 72 via bus 70. Bus 70 is... Figure 7 The connections between other components are indicated by thick lines and are for illustrative purposes only, not as limiting information. Bus 70 can be divided into address bus, data bus, control bus, etc., for ease of representation. Figure 7 The term 71 is represented by a single thick line, but this does not imply that there is only one bus or one type of bus. Alternatively, the processor 71 can also be called a controller; there is no restriction on the name.

[0121] In this embodiment, memory 72 stores instructions executable by at least one processor 71. By executing the instructions stored in memory 72, at least one processor 71 can perform the EGR control method described above. Processor 71 can implement... Figure 6 The functions of each module in the device shown.

[0122] The processor 71 is the control center of the device. It can connect to various parts of the control device through various interfaces and lines. By running or executing instructions stored in memory 72 and calling data stored in memory 72, the processor can perform various functions and process data, thereby monitoring the device as a whole.

[0123] In one possible design, processor 71 may include one or more processing units. Processor 71 may integrate an application processor and a modem processor, wherein the application processor mainly handles the operating system, user interface, and applications, and the modem processor mainly handles wireless communication. It is understood that the modem processor may also not be integrated into processor 71. In some embodiments, processor 71 and memory 72 may be implemented on the same chip; in some embodiments, they may also be implemented on separate chips.

[0124] Processor 71 can 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 device, or discrete hardware component, capable of implementing or executing the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the EGR control method disclosed in the embodiments of this application can be directly manifested as being executed by a hardware processor, or executed by a combination of hardware and software modules within the processor.

[0125] Memory 72, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. Memory 72 may include at least one type of storage medium, such as flash memory, hard disk, multimedia card, card-type memory, random access memory (RAM), static random access memory (SRAM), programmable read-only memory (PROM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), magnetic storage, magnetic disk, optical disk, etc. Memory 72 can be any other medium capable of carrying or storing desired program code in the form of instructions or data structures that can be accessed by a computer, but is not limited thereto. In the embodiments of this application, memory 72 may also be a circuit or any other device capable of implementing storage functions for storing program instructions and / or data.

[0126] By designing and programming the processor 71, the code corresponding to the EGR control method described in the foregoing embodiments can be embedded into the chip, enabling the chip to execute the code during operation. Figure 4 The steps of the EGR control method in the illustrated embodiment are as follows. How to design and program the processor 71 is a technique well-known to those skilled in the art and will not be described further here.

[0127] Based on the same inventive concept, embodiments of this application also provide a storage medium storing computer instructions that, when executed on a computer, cause the computer to perform the EGR control method described above.

[0128] In some possible implementations, various aspects of the EGR control method provided in this application may also be implemented in the form of a program product, which includes program code that, when the program product is run on a device, causes the control device to perform the steps in the EGR control method according to the various exemplary embodiments of this application described above.

[0129] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can 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, etc.) containing computer-usable program code.

[0130] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can 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, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0131] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0132] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0133] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. An EGR control method, characterized in that, The method includes: Based on the intake manifold pressure value set by the system, the mass flow rate of the gas entering the engine cylinder is calculated. The specific calculation formula is as follows: ,in, W in The mass flow rate of the gas is... k in For conversion factors, n Engine speed, V eng Engine displacement. R The gas constant is... P in For intake manifold pressure, T in This refers to the intake manifold temperature. Based on the gas mass flow rate and the current air mass flow rate fed back by the system, the exhaust mass flow rate of the EGR valve is calculated. The specific calculation formula is as follows: ,in, W EGR The exhaust mass flow rate is... The derivative of the intake manifold pressure. V in For the intake manifold volume, W c The current air quality flow rate is fed back by the system; Based on the exhaust mass flow rate and the EGR valve throttling coefficient, the opening degree of the first EGR valve is calculated using the following formula: ,in, U EGR The opening degree of the first EGR valve. C EGR This refers to the throttling coefficient of the EGR valve. P out This refers to the exhaust manifold pressure. T out This refers to the exhaust manifold temperature. The difference between the air mass flow rate and the current air mass flow rate entering the intake manifold is input into the PID controller to generate the second EGR valve opening. The opening degree of the first EGR valve is summed with the opening degree of the second EGR valve to obtain the opening degree of the third EGR valve, and the mass flow rate of the air entering the intake manifold is controlled according to the opening degree of the third EGR valve.

2. The method as described in claim 1, characterized in that, The control of the air mass flow rate entering the intake manifold based on the opening degree of the third EGR valve specifically includes: Adjust the opening of the EGR valve according to the opening degree of the third EGR valve; The mass flow rate of air entering the intake manifold is controlled by adjusting the opening of the EGR valve.

3. An EGR control device, characterized in that, The device includes: The calculation module calculates the mass flow rate of gas entering the engine cylinders based on the intake manifold pressure value set by the system. The specific calculation formula is as follows: ,in, W in The mass flow rate of the gas is... k in For conversion factors, n Engine speed, V eng Engine displacement. R The gas constant is... P in For intake manifold pressure, T in The intake manifold temperature is used; based on the gas mass flow rate and the current air mass flow rate fed back by the system, the exhaust mass flow rate of the EGR valve is calculated, and the specific calculation formula is as follows: ,in, W EGR The exhaust mass flow rate is... The derivative of the intake manifold pressure. V in For the intake manifold volume, W c The system feeds back the current air mass flow rate; based on the exhaust mass flow rate and the EGR valve throttling coefficient, the first EGR valve opening is calculated using the following formula: ,in, U EGR The opening degree of the first EGR valve. C EGR This refers to the throttling coefficient of the EGR valve. P out This refers to the exhaust manifold pressure. T out This refers to the exhaust manifold temperature. The generation module is used to input the difference between the air mass flow rate and the current air mass flow rate entering the intake manifold into the PID controller to generate the second EGR valve opening. The summation module is used to sum the first EGR valve opening and the second EGR valve opening to obtain the third EGR valve opening; A processing model is used to control the mass flow rate of air entering the intake manifold based on the opening degree of the third EGR valve.

4. An electronic device, characterized in that, include: Memory, used to store computer programs; A processor, when executing a computer program stored in the memory, implements the method steps of any one of claims 1-2.

5. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the method steps of any one of claims 1-2.

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