A method for determining EGR exhaust gas flow rate and related device

Abstract

The present application discloses an EGR exhaust gas flow determination method and related devices, which relate to the field of engine control. According to the current operating condition of the engine and the current parameter value of the weight determination parameter, the weight value of the current operating condition corresponding to the current parameter value can be determined from the target weight calibration table. According to the weight value of the current operating condition, the first exhaust gas flow and the second exhaust gas flow are fused to obtain the current exhaust gas flow of the exhaust gas recirculation system, wherein the first exhaust gas flow is the exhaust gas flow determined according to the first exhaust gas flow determination strategy, and the second exhaust gas flow is the exhaust gas flow determined according to the second exhaust gas flow determination strategy, wherein the two exhaust gas flow determination strategies can correspond to the transient operating condition and the steady-state operating condition of the engine respectively. By fusion of the exhaust gas flow under the two operating conditions using the corresponding weight values, the accuracy of the exhaust gas flow is improved, thereby improving the control accuracy of the EGR.

Description

Technical Field

[0001] The present application relates to the field of engine control technology, and in particular to an EGR exhaust gas flow determination method and related devices. Background Art

[0002] The EGR (Exhaust Gas Recirculation) system can reintroduce the exhaust gas from the engine into the intake pipe and participate in the combustion. The EGR technology can effectively reduce the engine combustion temperature and reduce the nitrogen oxides produced during the combustion process. The accuracy of the EGR exhaust flow rate will directly affect the emission control of the engine, and the current method for determining the exhaust gas flow rate is still insufficient, thus affecting the emission control of the engine. Summary of the invention

[0003] In view of the above problems, the present application provides a method and a related device for determining EGR exhaust gas flow rate to achieve the purpose of improving the accuracy of EGR exhaust gas flow rate. The specific scheme is as follows:

[0004] The first aspect of the present application provides a method for determining EGR exhaust gas flow rate, comprising:

[0005] According to the current operating condition of the engine and the current parameter value of the weight determination parameter, a weight value of the current operating condition corresponding to the current parameter value is determined from a target weight calibration table, wherein the target weight calibration table is a weight calibration table corresponding to the current operating condition;

[0006] The first exhaust gas flow rate and the second exhaust gas flow rate are merged according to the weight value of the current operating condition to obtain the current exhaust gas flow rate of the exhaust gas recirculation system, the first exhaust gas flow rate is the exhaust gas flow rate determined according to the first exhaust gas flow rate determination strategy, the second exhaust gas flow rate is the exhaust gas flow rate determined according to the second exhaust gas flow rate determination strategy, the first exhaust gas flow rate determination strategy is the exhaust gas flow rate determination strategy corresponding to the current operating condition, the second exhaust gas flow rate determination strategy is the exhaust gas flow rate determination strategy corresponding to the target operating condition, the target operating condition is different from the current operating condition, and the engine operating state represented by the target operating condition is opposite to the engine operating state represented by the current operating condition.

[0007] In a possible implementation, the process of determining the current operating condition of the engine includes:

[0008] According to the change value of the operating condition determination parameter and the operating condition judgment threshold of the engine, it is determined whether the current operating condition of the engine is a steady-state operating condition or a transient operating condition.

[0009] In a possible implementation, determining whether the current operating condition of the engine is a steady-state operating condition or a transient operating condition according to a change value of a parameter and an operating condition judgment threshold of the operating condition of the engine includes:

[0010] If the throttle change rate or the intake air volume change rate of the engine is less than the corresponding operating condition judgment threshold, it is determined that the current operating condition of the engine is the steady-state operating condition;

[0011] If the throttle change rate or the intake air volume change rate of the engine is not less than the corresponding operating condition judgment threshold, it is determined that the current operating condition of the engine is the transient operating condition.

[0012] In a possible implementation, the weight determination parameter includes: engine speed, and the weight value of the current working condition corresponding to the current parameter value is determined from a target weight calibration table according to the current working condition of the engine and the current parameter value of the weight determination parameter, including:

[0013] According to the current speed value of the engine speed, the weight value of the current operating condition corresponding to the current speed value is determined from the target weight calibration table.

[0014] In a possible implementation, the first exhaust gas flow rate and the second exhaust gas flow rate are merged according to the weight value of the current operating condition to obtain the current exhaust gas flow rate of the exhaust gas recirculation system, including: obtaining the current exhaust gas flow rate according to the following formula:

[0015] Current exhaust gas flow = W·M+(1-W)·Mˊ,

[0016] Wherein, W is the weight value of the current operating condition, M is the first exhaust gas flow rate, and Mˊ is the second exhaust gas flow rate.

[0017] In a possible implementation, the process of determining the exhaust gas flow rate under the steady-state condition includes: obtaining the exhaust gas flow rate under the steady-state condition according to the following formula:

[0018] Nˊ=Q-Qˊ,

[0019] Wherein, Nˊ is the exhaust gas flow rate under the steady-state condition, Q is the total intake volume of the engine, , , V _eng represents the engine displacement, represents the engine charging efficiency, P2 represents the intake pressure, T2 represents the intake temperature, R is the ideal gas constant, and Qˊ is the air intake volume flowing through the throttle valve.

[0020] In a possible implementation, the process of determining the exhaust gas flow rate under the transient operating condition includes: obtaining the exhaust gas flow rate under the transient operating condition according to the following formula:

[0021] ,

[0022] Wherein, N represents the exhaust gas flow rate under the transient condition, Ac max represents the maximum flow area of ​​the EGR valve, rA represents the proportion of the maximum flow area of ​​the EGR valve at the opening r, and P us Indicates the pressure upstream of the EGR valve, T us represents the temperature upstream of the EGR valve, R is the ideal gas constant, and represents the flow function determined by the pressure sensor upstream and downstream of the EGR valve.

[0023] A second aspect of the present application provides an EGR exhaust gas flow determination device, comprising:

[0024] a current operating condition weight determination module, configured to determine a weight value of the current operating condition corresponding to the current parameter value from a target weight calibration table according to the current operating condition of the engine and the current parameter value of the weight determination parameter, wherein the target weight calibration table is a weight calibration table corresponding to the current operating condition; and

[0025] A current exhaust gas flow fusion module is used to fuse the first exhaust gas flow and the second exhaust gas flow according to the weight value of the current operating condition to obtain the current exhaust gas flow of the exhaust gas recirculation system, the first exhaust gas flow is the exhaust gas flow determined according to the first exhaust gas flow determination strategy, the second exhaust gas flow is the exhaust gas flow determined according to the second exhaust gas flow determination strategy, the first exhaust gas flow determination strategy is the exhaust gas flow determination strategy corresponding to the current operating condition, the second exhaust gas flow determination strategy is the exhaust gas flow determination strategy corresponding to the target operating condition, the target operating condition is different from the current operating condition, and the engine operating state represented by the target operating condition is opposite to the engine operating state represented by the current operating condition.

[0026] The third aspect of the present application provides a computer program product, including computer-readable instructions. When the computer-readable instructions are executed on an electronic device, the electronic device implements the EGR exhaust gas flow determination method of the above-mentioned first aspect or any implementation method of the first aspect.

[0027] A fourth aspect of the present application provides an electronic device, comprising at least one processor and a memory connected to the processor, wherein:

[0028] The memory is used to store computer programs;

[0029] The processor is used to execute the computer program so that the electronic device can implement the EGR exhaust gas flow determination method of the above-mentioned first aspect or any implementation method of the first aspect.

[0030] A fifth aspect of the present application provides a computer storage medium, which carries one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement the EGR exhaust gas flow determination method of the above-mentioned first aspect or any implementation of the first aspect.

[0031] By means of the above technical scheme, the EGR exhaust gas flow determination method provided by the present application can determine the weight value of the current working condition corresponding to the current parameter value from the target weight calibration table according to the current working condition of the engine and the current parameter value of the weight determination parameter. The first exhaust gas flow and the second exhaust gas flow are merged according to the weight value of the current working condition to obtain the current exhaust gas flow of the exhaust gas recirculation system, wherein the first exhaust gas flow is the exhaust gas flow determined according to the first exhaust gas flow determination strategy, the second exhaust gas flow is the exhaust gas flow determined according to the second exhaust gas flow determination strategy, the first exhaust gas flow determination strategy is the exhaust gas flow determination strategy corresponding to the current working condition, the second exhaust gas flow determination strategy is the exhaust gas flow determination strategy corresponding to the target working condition, the target working condition is different from the current working condition, and the engine operating state represented by the target working condition is opposite to the engine operating state represented by the current working condition. The EGR exhaust gas flow determination method merges the exhaust gas flow determined under the two working conditions using the weight value determined under the current working condition, which can effectively improve the accuracy of the exhaust gas flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and the originals and elements are not necessarily drawn to scale.

[0033] Figure 1 A structural diagram of the EGR system provided for this application;

[0034] Figure 2 A flow chart of the EGR exhaust gas flow determination method provided in this application;

[0035] Figure 3 The schematic diagram of the EGR exhaust gas flow determination device provided in this application;

[0036] Figure 4 The structure of the electronic device provided by this application. DETAILED DESCRIPTION

[0037] The following describes the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. The terms used in the implementation method section of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

[0038] The embodiments of the present application are described below in conjunction with the accompanying drawings. Those skilled in the art will appreciate that, with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0039] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and need not be used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, which is only to describe the distinction mode adopted by the objects of the same attributes when describing in the embodiments of the present application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0040] At present, in order to improve the EGR rate of the engine and reduce costs, more and more engines use EGR modules (adopting modular design, highly integrating sensors and execution). Figure 1 As shown in the figure, it mainly includes an EGR valve and P3 and P1 pressure sensors installed before and after the EGR valve, an intake pipe with an intake venturi structure and P0, P1, P2 pressure sensors before and after the pipe, a throttle and other components. The EGR valve is used to control the amount of recirculated exhaust gas. The one installed before the EGR cooler is called the hot end EGR valve, and the one installed after the EGR cooler is called the cold end EGR valve. The throttle is installed in the intake pipe to adjust the real-time intake volume of the engine.

[0041] The accurate calculation of EGR exhaust gas flow is the key to engine emission control. The current process of determining EGR exhaust gas flow is as follows:

[0042] ,

[0043] Where, N represents the exhaust gas flow rate of EGR, Ac max represents the maximum flow area of ​​the EGR valve, rA represents the proportion of the maximum flow area of ​​the EGR valve at the opening r, and P us Indicates the pressure upstream of the EGR valve, T us represents the temperature upstream of the EGR valve, R is the ideal gas constant, represents the flow function determined by the pressure sensor upstream and downstream of the EGR valve.

[0044] in It can be a flow function composed of pressure sensor P3 and pressure sensor P1, specifically:

[0045] Where K is the gas specific heat constant, π is the ratio of pressure sensor P3 to pressure sensor P1, π crit is the critical pressure ratio.

[0046] The above EGR flow determination method is a theoretical calculation process, which is based on many assumptions, such as the assumption that the gas is incompressible, there is no friction loss during the flow process, etc., so the flow calculation accuracy is not very high. In addition, the boundary applicability and consistency of the EGR flow determination method are poor. For example, if there are differences in the vehicle installation boundary, such as the after-treatment pipeline is longer, resulting in a higher P3 pressure, a larger intercooler pressure drop, etc., or the environment changes, such as in a plateau environment or a low temperature environment, the flow calculation accuracy becomes worse.

[0047] In order to solve the above problems, an embodiment of the present application provides a method for determining the EGR exhaust gas flow rate. The method for determining the EGR exhaust gas flow rate of the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0048] Reference Figure 2 , Figure 2 A flow chart of a method for determining EGR exhaust gas flow rate provided in an embodiment of the present application is shown as follows: Figure 2 As shown, an EGR exhaust gas flow determination method provided in an embodiment of the present application may include steps 201 to 202, and these steps are described in detail below.

[0049] 201. According to the current operating condition of the engine and the current parameter value of the weight determination parameter, the weight value of the current operating condition corresponding to the current parameter value is determined from a target weight calibration table, and the target weight calibration table is a weight calibration table corresponding to the current operating condition.

[0050] Specifically, in order to improve the accuracy of the engine's EGR valve control under steady-state and transient conditions, different acquisition methods can be used to determine the EGR exhaust gas flow rate according to the characteristics of the steady-state or transient conditions, and then the EGR exhaust gas flow rates determined under the two conditions are fused according to the weights determined under the current conditions, thereby obtaining a more accurate EGR exhaust gas flow rate.

[0051] The steady-state condition of the engine refers to the condition where the engine has completed preheating and entered normal operation, and there is no change in speed or load for a certain period of time. This condition can be further divided into three ranges according to the load size: idle and light load, medium load and full load. Under idle and light load conditions, the engine speed and load remain constant and do not change, which allows the engine to operate in a stable state. For example, when a car is waiting to stop or driving at a low speed, the engine is in this steady-state condition.

[0052] Transient operating conditions refer to the engine's operating conditions that are constantly changing, that is, the engine's speed and load change over time. The engine's operating state under this condition is not constant, but the engine's speed and load will change during acceleration, deceleration, loading or unloading. For example, when a car accelerates from a stationary state to a certain speed, or suddenly accelerates or decelerates during driving, the engine is in a transient condition. Transient conditions are opposite to steady-state conditions, and the two can be understood as representing two opposite operating states of the engine.

[0053] The weight value of the current working condition can be determined by determining the weight value of the current working condition corresponding to the current value from the target weight calibration table according to the current value of the engine characteristic parameter. For example, the weight value of the current working condition corresponding to the current speed value can be determined from the target weight calibration table according to the current speed value of the engine speed. For example, the steady-state working condition table is as follows:

[0054]

[0055] The transient operating condition table is as follows:

[0056]

[0057] W in the above two tables represents the weight value under the current working conditions.

[0058] It is understandable that those skilled in the art may also use other engine parameters to determine the weight value of the current operating condition, which is not limited here.

[0059] 202. The first exhaust gas flow rate and the second exhaust gas flow rate are merged according to the weight value of the current operating condition to obtain the current exhaust gas flow rate of the exhaust gas recirculation system, the first exhaust gas flow rate is the exhaust gas flow rate determined according to the first exhaust gas flow rate determination strategy, the second exhaust gas flow rate is the exhaust gas flow rate determined according to the second exhaust gas flow rate determination strategy, the first exhaust gas flow rate determination strategy is the exhaust gas flow rate determination strategy corresponding to the current operating condition, the second exhaust gas flow rate determination strategy is the exhaust gas flow rate determination strategy corresponding to the target operating condition, the target operating condition is different from the current operating condition, and the engine operating state represented by the target operating condition is opposite to the engine operating state represented by the current operating condition.

[0060] Specifically, as mentioned above, the currently used method for determining the EGR exhaust gas flow has the problems of poor boundary applicability and poor consistency, but the advantage of this calculation method is that it has a fast responsiveness, and the control of the EGR valve can be quickly started based on this method.

[0061] The exhaust gas flow rate under steady-state conditions can be obtained using the following formula:

[0062] Nˊ=Q-Qˊ

[0063] Among them, Nˊ is the exhaust gas flow rate under steady-state conditions, Q is the total engine intake volume, , , V _eng represents the engine displacement, represents the engine charging efficiency, P2 represents the intake pressure, T2 represents the intake temperature, R is the ideal gas constant, and Qˊ is the air intake volume flowing through the throttle valve.

[0064] Where Qˊ is a function of the throttle opening K, pressure sensor P0 and pressure sensor P1, and its simplified formula is as follows:

[0065] Qˊ=F(K,P0,P1)

[0066] The specific structure of the above formula can refer to the existing flow equation of the air intake of the throttle in the art, which will not be repeated here.

[0067] The EGR exhaust gas flow Nˊ obtained above has a high steady-state calculation accuracy. However, since the P2 pressure sensor is installed at the rear end of the intake pipe, there is a larger intake pipe cavity at its installation position. Therefore, the response is slow under transient conditions (Q calculation is slow), and the EGR valve control cannot be started quickly. Accurate EGR valve control can only be performed under steady-state conditions.

[0068] By combining the advantages of the above transient exhaust gas flow calculation method and the steady-state exhaust gas flow calculation method, the two are integrated according to the weight of the current working condition:

[0069] Current exhaust gas flow = W·M+(1-W)·Mˊ

[0070] Wherein, W is the weight value of the current working condition, M is the first exhaust gas flow rate (ie, N), and Mˊ is the second exhaust gas flow rate (ie, Nˊ).

[0071] This makes the calculation precision and accuracy of the EGR exhaust gas flow rate higher, making the EGR control more responsive and more stable.

[0072] In a possible implementation, in order to facilitate the determination of the current operating condition of the engine, the process of determining the current operating condition of the engine may specifically include:

[0073] The change value of the parameter and the operating condition judgment threshold are determined according to the operating condition of the engine, and it is determined whether the current operating condition of the engine is a steady-state condition or a transient condition.

[0074] Specifically, the judgment can be made based on the change of the throttle change rate and the intake volume of the engine. If the throttle change rate or the intake volume change rate of the engine is less than the corresponding working condition judgment threshold, the current working condition of the engine is determined to be a steady-state working condition.

[0075] If the throttle change rate or the intake air volume change rate of the engine is not less than the corresponding operating condition judgment threshold, it is determined that the current operating condition of the engine is the transient operating condition.

[0076] For example, the throttle change rate is an indicator of the speed of throttle pedal input, which can be obtained by calculating the change in throttle travel divided by time. For example, if the throttle travel is 25% in 0.5 seconds, the throttle change rate is 50%. At this time, it can be judged that the throttle has undergone a relatively large change in a short period of time, so the working condition at this time can be determined as a transient working condition. Otherwise, it can be determined as a steady-state working condition. Similarly, the process of judging the working condition for the change rate of the intake volume is similar to the above process and will not be repeated here.

[0077] It should be noted that those skilled in the art may also use other engine parameters to determine the engine operating conditions, which is not limited here.

[0078] A method for determining an EGR exhaust gas flow rate provided in an embodiment of the present application is introduced above, and a device for executing the above-mentioned method for determining an EGR exhaust gas flow rate will be introduced below.

[0079] See also Figure 3 , Figure 3 This is a schematic diagram of the structure of an EGR exhaust gas flow determination device provided in an embodiment of the present application. Figure 3 As shown, the EGR exhaust gas flow determination device comprises:

[0080] The current operating condition weight determination module 301 is used to determine the weight value of the current operating condition corresponding to the current parameter value from a target weight calibration table according to the current operating condition of the engine and the current parameter value of the weight determination parameter, wherein the target weight calibration table is a weight calibration table corresponding to the current operating condition; and

[0081] The current exhaust gas flow fusion module 302 is used to fuse the first exhaust gas flow and the second exhaust gas flow according to the weight value of the current operating condition to obtain the current exhaust gas flow of the exhaust gas recirculation system, wherein the first exhaust gas flow is the exhaust gas flow determined according to the first exhaust gas flow determination strategy, and the second exhaust gas flow is the exhaust gas flow determined according to the second exhaust gas flow determination strategy, the first exhaust gas flow determination strategy is the exhaust gas flow determination strategy corresponding to the current operating condition, and the second exhaust gas flow determination strategy is the exhaust gas flow determination strategy corresponding to the target operating condition, the target operating condition is different from the current operating condition, and the engine operating state represented by the target operating condition is opposite to the engine operating state represented by the current operating condition.

[0082] In a possible implementation, the process of determining the current operating condition of the engine by the current operating condition weight determination module 301 includes:

[0083] According to the change value of the operating condition determination parameter and the operating condition judgment threshold of the engine, it is determined whether the current operating condition of the engine is a steady-state operating condition or a transient operating condition.

[0084] In a possible implementation, the current operating condition weight determination module 301 determines whether the current operating condition of the engine is a steady-state operating condition or a transient operating condition according to the change value of the operating condition determination parameter of the engine and the operating condition judgment threshold, including:

[0085] If the throttle change rate or the intake air volume change rate of the engine is less than the corresponding operating condition judgment threshold, it is determined that the current operating condition of the engine is the steady-state operating condition;

[0086] If the throttle change rate or the intake air volume change rate of the engine is not less than the corresponding operating condition judgment threshold, it is determined that the current operating condition of the engine is the transient operating condition.

[0087] In a possible implementation, the weight determination parameter includes: engine speed, and the current operating condition weight determination module 301 determines the weight value of the current operating condition corresponding to the current parameter value from the target weight calibration table according to the current operating condition of the engine and the current parameter value of the weight determination parameter, including:

[0088] According to the current speed value of the engine speed, the weight value of the current operating condition corresponding to the current speed value is determined from the target weight calibration table.

[0089] In a possible implementation, the current exhaust gas flow fusion module 302 fuses the first exhaust gas flow and the second exhaust gas flow according to the weight value of the current working condition to obtain the current exhaust gas flow of the exhaust gas recirculation system, including: obtaining the current exhaust gas flow according to the following formula:

[0090] Current exhaust gas flow = W·M+(1-W)·Mˊ

[0091] Wherein, W is the weight value of the current operating condition, M is the first exhaust gas flow rate, and Mˊ is the second exhaust gas flow rate.

[0092] In a possible implementation, the process of determining the exhaust gas flow rate under the steady-state condition of the current exhaust gas flow fusion module 302 includes: a process of obtaining the exhaust gas flow rate under the steady-state condition according to the following formula:

[0093] Nˊ=Q-Qˊ

[0094] Wherein, Nˊ is the exhaust gas flow rate under the steady-state condition, Q is the total intake volume of the engine, , , V _engrepresents the engine displacement, represents the engine charging efficiency, P2 represents the intake pressure, T2 represents the intake temperature, R is the ideal gas constant, and Qˊ is the air intake volume flowing through the throttle valve.

[0095] In a possible implementation, the process of determining the exhaust gas flow rate under the transient working condition of the current exhaust gas flow fusion module 302 includes: obtaining the exhaust gas flow rate under the transient working condition according to the following formula:

[0096] Wherein, N represents the exhaust gas flow rate under the transient condition, Ac max represents the maximum flow area of ​​the EGR valve, rA represents the proportion of the maximum flow area of ​​the EGR valve at the opening r, and P us Indicates the pressure upstream of the EGR valve, T us represents the temperature upstream of the EGR valve, R is the ideal gas constant, and represents the flow function determined by the pressure sensor upstream and downstream of the EGR valve.

[0097] The present application also provides an electronic device in an embodiment. Figure 4 As shown, it shows a structural schematic diagram of an electronic device suitable for implementing the embodiments of the present application. Figure 4 The electronic device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0098] like Figure 4 As shown, the electronic device may include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 401, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 402 or a program loaded from a storage device 408 to a random access memory (RAM) 403. When the electronic device is powered on, various programs and data required for the operation of the electronic device are also stored in the RAM 403. The processing device 401, the ROM 402, and the RAM 403 are connected to each other via a bus 404. An input / output (I / O) interface 405 is also connected to the bus 404.

[0099] Typically, the following devices may be connected to the I / O interface 405: an input device 406 including, for example, a touch screen, a touch pad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; an output device 407 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 408 including, for example, a memory card, a hard disk, etc.; and a communication device 409. The communication device 409 may allow the electronic device to communicate with other devices wirelessly or by wire to exchange data. Although Figure 4An electronic device having various devices is shown, but it should be understood that it is not required to implement or possess all the devices shown. More or fewer devices may be implemented or possessed instead.

[0100] An embodiment of the present application also provides a computer program product including computer-readable instructions. When the computer-readable instructions are executed on an electronic device, the electronic device implements any one of the EGR exhaust gas flow determination methods provided in the embodiments of the present application.

[0101] A computer-readable storage medium is also provided in an embodiment of the present application. The storage medium carries one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement any EGR exhaust gas flow determination method provided in the embodiment of the present application.

[0102] It should also be noted that the device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed over multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the drawings of the device embodiments provided by the present application, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines.

[0103] Through the description of the above implementation mode, the technicians in the field can clearly understand that the present application can be implemented by means of software plus necessary general hardware, and of course, it can also be implemented by special hardware including special integrated circuits, special CPUs, special memories, special components, etc. In general, all functions completed by computer programs can be easily implemented by corresponding hardware, and the specific hardware structure used to implement the same function can also be various, such as analog circuits, digital circuits or special circuits. However, for the present application, software program implementation is a better implementation mode in more cases. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a readable storage medium, such as a computer floppy disk, a U disk, a mobile hard disk, a ROM, a RAM, a disk or an optical disk, etc., including a number of instructions to enable a computer device (which can be a personal computer, a training device, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0104] In the above embodiments, all or part of the embodiments may be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments may be implemented in the form of a computer program product.

[0105] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website site, a computer, a training device, or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, training device, or data center. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a training device, a data center, etc. that includes one or more available media integrations. The available medium may be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)), etc.

Claims

1. A method for determining EGR exhaust gas flow rate, characterized in that: include: According to the current operating condition of the engine and the current parameter value of the weight determination parameter, a weight value of the current operating condition corresponding to the current parameter value is determined from a target weight calibration table, wherein the target weight calibration table is a weight calibration table corresponding to the current operating condition; The first exhaust gas flow rate and the second exhaust gas flow rate are merged according to the weight value of the current operating condition to obtain the current exhaust gas flow rate of the exhaust gas recirculation system, the first exhaust gas flow rate is the exhaust gas flow rate determined according to the first exhaust gas flow rate determination strategy, the second exhaust gas flow rate is the exhaust gas flow rate determined according to the second exhaust gas flow rate determination strategy, the first exhaust gas flow rate determination strategy is the exhaust gas flow rate determination strategy corresponding to the current operating condition, the second exhaust gas flow rate determination strategy is the exhaust gas flow rate determination strategy corresponding to the target operating condition, the target operating condition is different from the current operating condition, and the determination process of the current operating condition of the engine includes: According to the change value of the parameter determined by the operating condition of the engine and the operating condition judgment threshold, it is determined whether the current operating condition of the engine is a steady-state condition or a transient operating condition; when the current operating condition is the steady-state condition, the target operating condition is the transient operating condition; when the current operating condition is the transient operating condition, the target operating condition is the steady-state condition.

2. The method for determining the EGR exhaust gas flow rate according to claim 1, characterized in that: Determining whether the current operating condition of the engine is a steady-state operating condition or a transient operating condition according to a change value of a parameter determined according to the operating condition of the engine and an operating condition judgment threshold, includes: If the throttle change rate or the intake air volume change rate of the engine is less than the corresponding operating condition judgment threshold, it is determined that the current operating condition of the engine is the steady-state operating condition; If the throttle change rate or the intake air volume change rate of the engine is not less than the corresponding operating condition judgment threshold, it is determined that the current operating condition of the engine is the transient operating condition.

3. The method for determining the EGR exhaust gas flow rate according to claim 1, characterized in that: The weight determination parameter includes: engine speed, and the weight value of the current working condition corresponding to the current parameter value is determined from the target weight calibration table according to the current working condition of the engine and the current parameter value of the weight determination parameter, including: According to the current speed value of the engine speed, the weight value of the current operating condition corresponding to the current speed value is determined from the target weight calibration table.

4. The method for determining the EGR exhaust gas flow rate according to claim 1, characterized in that: The first exhaust gas flow rate and the second exhaust gas flow rate are merged according to the weight value of the current working condition to obtain the current exhaust gas flow rate of the exhaust gas recirculation system, including: obtaining the current exhaust gas flow rate according to the following formula: Current exhaust gas flow = W·M+(1-W)·Mˊ, Wherein, W is the weight value of the current operating condition, M is the first exhaust gas flow rate, and Mˊ is the second exhaust gas flow rate.

5. The method for determining the EGR exhaust gas flow rate according to claim 1, characterized in that: The process of determining the exhaust gas flow rate under the steady-state condition includes: obtaining the exhaust gas flow rate under the steady-state condition according to the following formula: Nˊ=Q-Qˊ, Wherein, Nˊ is the exhaust gas flow rate under the steady-state condition, Q is the total intake volume of the engine, , , V _eng represents the engine displacement, represents the engine charging efficiency, P2 represents the intake pressure, T2 represents the intake temperature, R is the ideal gas constant, and Qˊ is the air intake volume flowing through the throttle valve.

6. The method for determining the EGR exhaust gas flow rate according to claim 1, characterized in that: The process of determining the exhaust gas flow rate under the transient working condition includes: obtaining the exhaust gas flow rate under the transient working condition according to the following formula: ， Wherein, N represents the exhaust gas flow rate under the transient condition, Ac max represents the maximum flow area of ​​the EGR valve, rA represents the proportion of the maximum flow area of ​​the EGR valve at the opening r, and P us Indicates the pressure upstream of the EGR valve, T us represents the temperature upstream of the EGR valve, R is the ideal gas constant, represents the flow function determined by the pressure sensor upstream and downstream of the EGR valve.

7. An EGR exhaust gas flow determination device, characterized in that: include: A current operating condition weight determination module, configured to determine a weight value of the current operating condition corresponding to the current parameter value from a target weight calibration table according to the current operating condition of the engine and the current parameter value of the weight determination parameter, wherein the target weight calibration table is a weight calibration table corresponding to the current operating condition; as well as, A current exhaust gas flow fusion module is used to fuse the first exhaust gas flow and the second exhaust gas flow according to the weight value of the current operating condition to obtain the current exhaust gas flow of the exhaust gas recirculation system, the first exhaust gas flow is the exhaust gas flow determined according to the first exhaust gas flow determination strategy, the second exhaust gas flow is the exhaust gas flow determined according to the second exhaust gas flow determination strategy, the first exhaust gas flow determination strategy is the exhaust gas flow determination strategy corresponding to the current operating condition, the second exhaust gas flow determination strategy is the exhaust gas flow determination strategy corresponding to the target operating condition, the target operating condition is different from the current operating condition, and the determination process of the current operating condition of the engine includes: According to the change value of the parameter determined by the operating condition of the engine and the operating condition judgment threshold, it is determined whether the current operating condition of the engine is a steady-state condition or a transient operating condition; when the current operating condition is the steady-state condition, the target operating condition is the transient operating condition; when the current operating condition is the transient operating condition, the target operating condition is the steady-state condition.

8. An electronic device, characterized in that: The method comprises at least one processor and a memory connected to the processor, wherein: The memory is used to store computer programs; The processor is used to execute the computer program so that the electronic device can implement the EGR exhaust gas flow determination method as described in any one of claims 1 to 6.

9. A computer storage medium, characterized in that: The storage medium carries one or more computer programs, and when the one or more computer programs are executed by an electronic device, the electronic device can implement the EGR exhaust gas flow determination method as described in any one of claims 1 to 6.

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