Exhaust gas recirculation (EGR) flow calculation method and device, and electronic equipment

Abstract

This application discloses an exhaust gas recirculation (EGR) flow calculation method, device, and electronic device. The method comprises: comparing the exhaust oxygen concentration at the second exhaust port of an exhaust pipe with a preset oxygen concentration range to obtain a first comparison result, and determining a target exhaust oxygen concentration based on the first comparison result; determining a fresh intake air flow based on the target exhaust oxygen concentration and the engine's fuel consumption; comparing the engine's circulating fuel supply with a preset fuel supply to obtain a second comparison result, and determining a target fresh intake air flow based on the second comparison result and the fresh intake air flow; and determining an EGR flow based on the mixed gas flow entering the engine and the target fresh intake air flow. This application reduces development costs and improves EGR flow control accuracy during engine transients.

Description

Technical Field

[0001] The present invention relates to the technical field of engine control, and in particular to an exhaust gas recirculation (EGR) flow calculation method and device, and electronic equipment. Background Art

[0002] Currently, most heavy-duty engines use Venturi differential pressure sensors to measure EGR (exhaust gas recirculation) flow. However, Venturi differential pressure sensors are subject to problems such as aging, drift, and blockage. These problems are particularly severe during engine transients, leading to inaccurate EGR flow calculations. Summary of the Invention

[0003] The purpose of this application is to provide an exhaust gas recirculation (EGR) flow calculation method, device, and electronic device to solve the problem of inaccurate EGR flow calculation caused by aging, drift, and blockage of the Venturi differential pressure sensor.

[0004] In a first aspect, an embodiment of the present application provides an exhaust gas recirculation (EGR) flow calculation method, which is applied to a gas circulation system, wherein the gas circulation system includes a fresh air intake duct, a mixed air intake duct, an exhaust duct, an EGR duct, and an engine; wherein the air intake of the engine is connected to the exhaust port of the mixed air intake duct, and the exhaust port of the engine is connected to the air intake of the exhaust duct; the air intake of the mixed air intake duct is respectively connected to the exhaust port of the EGR duct and the exhaust port of the fresh air intake duct; the first exhaust port of the exhaust duct is connected to the air intake of the EGR duct, and the second exhaust port of the exhaust duct is connected to a post-processing device, and the method includes:

[0005] Comparing the exhaust oxygen concentration value at the second exhaust port of the exhaust pipe with a preset oxygen concentration range to obtain a first comparison result, and determining a target exhaust oxygen concentration value according to the first comparison result;

[0006] determining a fresh intake air flow rate value of the fresh intake pipe based on the target exhaust oxygen concentration value and the fuel consumption value of the engine;

[0007] Comparing the circulating fuel supply of the engine with a preset fuel supply to obtain a second comparison result, and determining a target fresh intake air flow value based on the second comparison result and the fresh intake air flow value;

[0008] determining an EGR flow rate value of the engine based on a mixed gas flow rate value entering the engine and the target fresh intake air flow rate value;

[0009] The mixed gas flow rate value is determined based on a circulation system parameter value, an engine speed value, and an engine displacement; the circulation system parameters include an intake pressure and an intake temperature of an engine intake port.

[0010] In some possible embodiments, determining the fresh intake air flow rate value of the fresh intake pipe based on the target exhaust oxygen concentration value and the fuel consumption of the engine includes:

[0011] determining an excess air coefficient based on the target exhaust oxygen concentration value;

[0012] A fresh intake air flow rate value of the fresh intake pipe is determined based on the excess air coefficient, the fuel consumption of the engine, and an air-fuel ratio formula.

[0013] In some possible embodiments, determining the target exhaust oxygen concentration value according to the first comparison result includes:

[0014] If the first comparison result is that the exhaust oxygen concentration value at the second exhaust port of the exhaust pipe is within a preset oxygen concentration range, determining the exhaust oxygen concentration value to be a target exhaust oxygen concentration value;

[0015] If the first comparison result is that the exhaust oxygen concentration value at the second exhaust port of the exhaust pipe is not within the preset oxygen concentration range, and the exhaust oxygen concentration value is lower than the minimum oxygen concentration value in the preset oxygen concentration range, determining the minimum oxygen concentration value as the target exhaust oxygen concentration value;

[0016] If the first comparison result is that the exhaust oxygen concentration value at the second exhaust port of the exhaust pipe is not within the preset oxygen concentration range, and the exhaust oxygen concentration value is higher than the maximum oxygen concentration value in the preset oxygen concentration range, the maximum oxygen concentration value is determined to be the target exhaust oxygen concentration value.

[0017] In some possible embodiments, determining the EGR flow value of the engine based on the mixed gas flow value entering the engine and the fresh intake air flow value includes:

[0018] The difference between the mixed gas flow rate value of the engine and the fresh intake air flow rate value is used as the EGR flow rate value of the engine.

[0019] In some possible embodiments, the mixed gas flow value is determined by:

[0020] determining a first product of the intake air pressure, the engine charging efficiency, the engine speed, and the engine displacement;

[0021] The ratio of the first product to the intake air temperature is used as the mixed gas flow rate value.

[0022] In some possible embodiments, determining a target fresh intake air flow rate value according to the second comparison result and the fresh intake air flow rate value includes:

[0023] If the second comparison result is that the circulating fuel supply of the engine is greater than the preset fuel supply, determining the fresh intake air flow value to be the target fresh intake air flow value;

[0024] If the second comparison result is that the circulating fuel supply of the engine is less than the preset fuel supply, determining the maximum value of the fresh intake air flow rate value and the first flow rate value as the target fresh intake air flow rate value; wherein the first flow rate value is an intake air flow rate value determined based on the engine speed and a preset speed-minimum intake air flow rate comparison table;

[0025] If the second comparison result is that the circulating fuel supply of the engine is equal to the preset fuel supply, the fresh intake air flow value is determined to be the target fresh intake air flow value, and the fresh intake air flow value is equal to the first flow value.

[0026] In a second aspect, an embodiment of the present application provides an exhaust gas recirculation (EGR) flow calculation device, the device comprising:

[0027] a module for determining a target exhaust oxygen concentration value, configured to compare the exhaust oxygen concentration value at the second exhaust port of the exhaust pipe with a preset oxygen concentration range to obtain a first comparison result, and determine a target exhaust oxygen concentration value based on the first comparison result;

[0028] a module for determining a fresh intake air flow value, configured to determine a fresh intake air flow value of a fresh intake air pipeline based on the target exhaust oxygen concentration value and the fuel consumption value of the engine;

[0029] a module for determining a target fresh intake air flow rate value, configured to compare a circulating fuel supply of the engine with a preset fuel supply amount to obtain a second comparison result, and determine a target fresh intake air flow rate value based on the second comparison result and the fresh intake air flow rate value;

[0030] an EGR flow value determining module, configured to determine an EGR flow value of the engine based on a mixed gas flow value entering the engine and the target fresh intake air flow value;

[0031] The mixed gas flow rate value is determined based on a circulation system parameter value, an engine speed value, and an engine displacement; the circulation system parameters include an intake pressure and an intake temperature of an engine intake port.

[0032] In a third aspect, an embodiment of the present application provides an electronic device comprising at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the exhaust gas recirculation EGR flow calculation method provided in the first aspect above.

[0033] In a fourth aspect, an embodiment of the present application provides a computer storage medium, wherein the computer storage medium stores a computer program, and the computer program is used to enable a computer to execute the exhaust gas recirculation (EGR) flow calculation method provided in the first aspect.

[0034] In order to solve the problem of inaccurate EGR flow calculation caused by aging, drift and blockage of the Venturi pressure difference sensor, the embodiment of the present application adopts the maximum and minimum value selection principle when the exhaust oxygen concentration value is not within the preset oxygen concentration range during the transient process of the engine. The maximum or minimum value of the exhaust oxygen concentration value within the preset oxygen concentration range under the steady-state full working conditions is selected, and then the target exhaust oxygen concentration value is determined according to the determined maximum or minimum value; the target fresh intake flow value is calculated based on the target exhaust oxygen concentration value during the transient process of the engine, and is determined based on the first flow value corresponding to each engine speed range, which saves development costs and can improve the control accuracy of the EGR flow during the transient process of the engine.

[0035] Other features and advantages of the present application will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present application. The purposes and other advantages of the present application can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings introduced below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 is a schematic diagram of an application environment according to an embodiment of the present application;

[0038] Figure 2 Schematic diagram of a flow chart of an exhaust gas recirculation (EGR) flow calculation method according to one embodiment of the present application;

[0039] Figure 3 Detailed flowchart of an exhaust gas recirculation (EGR) flow calculation method according to one embodiment of the present application;

[0040] Figure 4 Schematic diagram of the structure of an exhaust gas recirculation (EGR) flow calculation device according to one embodiment of the present application;

[0041] Figure 5 The figure is a schematic diagram of the structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0042] The following will clearly and thoroughly describe the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0043] In the description of the embodiments of the present application, unless otherwise specified, the term "multiple" refers to two or more, and other quantifiers should be understood similarly. The preferred embodiments described herein are only used to illustrate and explain the present application and are not used to limit the present application. In addition, the embodiments of the present application and the features in the embodiments may be combined with each other if there is no conflict.

[0044] To further illustrate the technical solutions provided by the embodiments of the present application, this is described in detail below in conjunction with the accompanying drawings and specific implementation methods. Although the embodiments of the present application provide the method operation steps as shown in the following embodiments or drawings, more or fewer operation steps may be included in the method based on routine or no creative labor. In steps where there is no necessary causal relationship logically, the execution order of these steps is not limited to the execution order provided by the embodiments of the present application. During the actual processing process or when the control device is executed, the method can be executed in the order of the methods shown in the embodiments or drawings or in parallel.

[0045] Given that the Venturi differential pressure sensor in related art suffers from aging, drift, and blockage, leading to inaccurate EGR flow calculation, this application proposes an exhaust gas recirculation (EGR) flow calculation method, device, and electronic device that can save development costs and improve EGR flow control accuracy during engine transients.

[0046] Other features and advantages of the present application will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present application. The purposes and other advantages of the present application can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0047] The exhaust gas recirculation (EGR) flow rate calculation method in the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0048] See also Figure 1 , is a schematic diagram of a gas circulation system according to an embodiment of the present application.

[0049] like Figure 1 As shown, the gas circulation system includes a fresh air intake pipe, a mixed air intake pipe, an exhaust pipe, an EGR pipe and an engine; wherein, the air intake of the engine is connected to the exhaust port of the mixed air intake pipe, and the exhaust port of the engine is connected to the air intake of the exhaust pipe; the air intake of the mixed air intake pipe is respectively connected to the exhaust port of the EGR pipe and the exhaust port of the fresh air intake pipe; the first exhaust port of the exhaust pipe is connected to the air intake port of the EGR pipe, and the second exhaust port of the exhaust pipe is connected to the after-treatment device.

[0050] Specifically, see Figure 1 In the embodiment of the present application, a supercharger is provided at the fresh air intake duct and the exhaust duct, and an intake air temperature and pressure sensor is provided on the mixed air intake duct to monitor the intake pressure and intake air temperature of the engine intake port; an oxygen concentration sensor is provided on the exhaust pipe after the EGR duct and before the after-treatment device to monitor the exhaust oxygen concentration value at the second exhaust port of the exhaust duct.

[0051] Exhaust gas recirculation (EGR) refers to the process by which an engine redirects a portion of exhaust gas after combustion into the intake for further combustion. During engine operation, there are transient and steady-state operating conditions. Transient engine conditions refer to those in which engine speed and torque change rapidly over time. Currently, most heavy-duty engines use Venturi differential pressure sensors to measure exhaust gas recirculation (EGR) flow. However, Venturi differential pressure sensors are subject to issues such as aging, drift, and blockage. These issues are exacerbated during engine transients, resulting in poor transient measurement accuracy and impacting engine performance.

[0052] Figure 2 The following is a flow chart of an exhaust gas recirculation (EGR) flow calculation method according to the present invention, including:

[0053] Step 201: Compare the exhaust oxygen concentration value at the second exhaust port of the exhaust pipe with a preset oxygen concentration range to obtain a first comparison result, and determine a target exhaust oxygen concentration value according to the first comparison result.

[0054] Specifically, the first comparison result includes three situations:

[0055] In case 1, the exhaust oxygen concentration value at the second exhaust port of the exhaust pipe is within a preset oxygen concentration range.

[0056] Specifically, assuming that the preset oxygen concentration range is 5% to 20%, when the exhaust oxygen concentration value is 10%, the exhaust oxygen concentration value is determined to be the target exhaust oxygen concentration value, that is, the exhaust oxygen concentration value 10% is the target exhaust oxygen concentration value. It should be noted that the principle for determining the maximum oxygen concentration value and the minimum oxygen concentration value in the preset oxygen concentration range is to select the maximum and minimum values ​​of the exhaust oxygen concentration within the steady-state full operating range.

[0057] In the second case, the exhaust oxygen concentration value at the second exhaust port of the exhaust pipe is not within the preset oxygen concentration range, and the exhaust oxygen concentration value is lower than the minimum oxygen concentration value in the preset oxygen concentration range.

[0058] Specifically, assuming that the preset oxygen concentration range is 5% to 20%, when the exhaust oxygen concentration value is 4%, the minimum oxygen concentration value is determined to be the target exhaust oxygen concentration value, that is, 5% is the target exhaust oxygen concentration value.

[0059] Case three: the exhaust oxygen concentration value at the second exhaust port of the exhaust pipe is not within the preset oxygen concentration range, and the exhaust oxygen concentration value is higher than the maximum oxygen concentration value in the preset oxygen concentration range.

[0060] Specifically, assuming that the preset oxygen concentration range is 5% to 20%, when the exhaust oxygen concentration value is 21%, the maximum oxygen concentration value is determined to be the target exhaust oxygen concentration value, that is, 20% is the target exhaust oxygen concentration value.

[0061] Step 202 : determining a fresh intake air flow rate value of a fresh intake pipe based on a target exhaust oxygen concentration value and an engine fuel consumption value.

[0062] As an optional implementation, the fresh intake air flow rate value is determined by:

[0063] determining an excess air coefficient based on the target exhaust oxygen concentration value;

[0064] A fresh intake air flow rate value of the fresh intake pipe is determined based on the excess air coefficient, the fuel consumption of the engine, and an air-fuel ratio formula.

[0065] Specifically, the excess air coefficient formula is calculated using the target exhaust oxygen concentration value:

[0066] Among them, λ: excess air coefficient; X o2 : Target exhaust oxygen concentration value;

[0067] Air-fuel ratio formula: m A =λ×14.3×m F ;

[0068] Among them, m A : Fresh air flow rate; m F: Engine fuel consumption;

[0069] Step 203 : Compare the circulating fuel supply of the engine with a preset fuel supply to obtain a second comparison result, and determine a target fresh intake air flow value according to the second comparison result and the fresh intake air flow value.

[0070] Specifically, when the engine is in reverse, the circulating fuel supply is zero. At this time, the fresh air volume calculated based on the exhaust oxygen concentration is zero. To solve this problem, the circulating fuel supply of the engine is compared with the preset fuel supply. The second comparison result includes three cases:

[0071] Case 1: The circulating fuel supply of the engine is greater than the preset fuel supply.

[0072] Specifically, when the circulating fuel supply is greater than the preset fuel supply, the fresh intake flow value is determined to be the target fresh intake flow value, that is, the final target fresh intake flow value is the fresh intake flow value determined based on the target exhaust oxygen concentration value and the engine fuel consumption value.

[0073] Case 2: The circulating fuel supply of the engine is less than the preset fuel supply.

[0074] Specifically, when the circulating fuel supply of the engine is less than the preset fuel supply, the maximum value of the fresh intake air flow value and the first flow value is determined as the target fresh intake air flow value.

[0075] It should be noted that the first flow rate value is an intake flow rate value determined based on the engine speed and a preset speed-minimum intake flow rate comparison table. The preset speed-minimum intake flow rate comparison table is a pre-set comparison table that compares engine speed ranges with the minimum intake flow rates corresponding to those speed ranges. For example, when the engine speed range is 600-700, the minimum intake flow rate is a; when the engine speed range is 700-800, the minimum intake flow rate is b. When the engine's circulating fuel supply is less than the preset fuel supply, the maximum value between the fresh intake flow rate value calculated in step 202 and the first flow rate value is determined. This maximum value is used as the target fresh intake flow rate value. For example, if the fresh intake flow rate value is less than the first flow rate value, the first flow rate value replaces the fresh intake flow rate value calculated in step 202 as the target fresh intake flow rate value. If the fresh intake flow rate value is greater than the first flow rate value, the fresh intake flow rate value calculated in step 202 is directly used as the target fresh intake flow rate value.

[0076] In case three, the circulating fuel supply of the engine is equal to the preset fuel supply.

[0077] Specifically, when the engine's circulating fuel supply equals the preset fuel supply, the fresh intake air flow rate is determined to be the target fresh intake air flow rate, and the fresh intake air flow rate is equal to the first flow rate. That is, when the circulating fuel supply equals the preset fuel supply, the fresh intake air flow rate calculated in step 202 is equal to the first flow rate corresponding to the current engine speed.

[0078] Step 204 : determining an EGR flow rate value of the engine based on the mixed gas flow rate value entering the engine and the target fresh intake air flow rate value.

[0079] Specifically, the mixed gas flow rate value is determined based on the circulation system parameter value, the engine speed value and the engine displacement; the circulation system parameter includes the intake pressure and intake temperature of the engine intake port.

[0080] The mixed gas flow rate value is determined by the following method:

[0081] determining a first product of the intake air pressure, the engine charging efficiency, the engine speed, and the engine displacement;

[0082] The ratio of the first product to the intake air temperature is used as the mixed gas flow rate value.

[0083] Specifically,

[0084] Among them, m ch : mixed gas flow value; η: charging efficiency; V eng : engine displacement; P2: intake pressure; N e : engine speed; R: ideal gas constant;

[0085] Based on the mixed gas flow value and the target fresh intake air flow value, the EGR flow value of the engine is determined. As an optional implementation, the difference between the mixed gas flow value of the engine and the fresh intake air flow value is used as the EGR flow value of the engine.

[0086] Specifically, the final EGR flow value of the engine is the difference between the mixed gas flow value and the fresh intake air flow value.

[0087] m egr =m ch -m A ;

[0088] Among them, m egr : EGR flow value.

[0089] See also Figure 3 Detailed flow chart of exhaust gas recirculation (EGR) flow calculation in an embodiment of the present application;

[0090] Step 301: Read the exhaust oxygen concentration value at the second exhaust port of the exhaust pipe.

[0091] Step 302, determining whether the exhaust oxygen concentration value is within a preset oxygen concentration range, if so, proceed to step 303, if not, proceed to step 304;

[0092] Step 303: The exhaust gas oxygen concentration value is a target exhaust gas oxygen concentration value;

[0093] Step 304 , the minimum oxygen concentration value / maximum oxygen concentration value is the target exhaust oxygen concentration value;

[0094] Step 305 , determining an excess air coefficient based on the target exhaust oxygen concentration value;

[0095] Step 306 , determining a fresh intake air flow rate value of the fresh intake pipe based on the excess air coefficient, the fuel consumption of the engine, and an air-fuel ratio formula;

[0096] Step 307, determining whether the circulating oil supply is greater than or equal to the preset oil supply, if so, proceed to step 308, if not, proceed to step 309;

[0097] Step 308 , determining the fresh intake air flow value as the target fresh intake air flow value;

[0098] Step 309 , determining the maximum value of the fresh intake air flow rate value and the first flow rate value as the target fresh intake air flow rate value;

[0099] Step 310: The difference between the mixed gas flow rate value of the engine and the fresh intake air flow rate value is used as the EGR flow rate value of the engine.

[0100] When the exhaust oxygen concentration value is not within the preset oxygen concentration range during the transient process of the engine in the embodiment of the present application, the maximum and minimum value selection principle is adopted to select the maximum or minimum value of the exhaust oxygen concentration value within the preset oxygen concentration range under the steady-state full working conditions, and then the target exhaust oxygen concentration value is determined based on the determined maximum or minimum value; during the transient process of the engine, the target fresh intake flow value is calculated based on the target exhaust oxygen concentration value, and is determined based on the first flow value corresponding to each engine speed interval. The exhaust gas recirculation EGR flow calculation method provided by the embodiment of the present application replaces the Wenqiuli pressure difference sensor in the prior art, solves the problem of dive in the exhaust oxygen concentration value measurement process during the transient process of the engine, saves development costs, and can improve the control accuracy of the EGR flow during the transient process of the engine.

[0101] Example 2

[0102] Based on the same inventive concept, the present application also provides an exhaust gas recirculation (EGR) flow calculation device, such as Figure 4As shown, the device includes:

[0103] a module 401 for determining a target exhaust oxygen concentration value, configured to compare the exhaust oxygen concentration value at the second exhaust port of the exhaust pipe with a preset oxygen concentration range to obtain a first comparison result, and determine a target exhaust oxygen concentration value based on the first comparison result;

[0104] A fresh intake air flow value determining module 402 is configured to determine a fresh intake air flow value of a fresh intake air pipeline based on the target exhaust oxygen concentration value and the fuel consumption value of the engine;

[0105] a target fresh intake air flow rate determination module 403 for comparing the cyclic fuel supply of the engine with a preset fuel supply to obtain a second comparison result, and determining a target fresh intake air flow rate value based on the second comparison result and the fresh intake air flow rate value;

[0106] an EGR flow value determination module 404 for determining an EGR flow value of the engine based on the mixed gas flow value entering the engine and the target fresh intake air flow value;

[0107] The mixed gas flow rate value is determined based on a circulation system parameter value, an engine speed value, and an engine displacement; the circulation system parameters include an intake pressure and an intake temperature of an engine intake port.

[0108] Optionally, the module 402 for determining the fresh intake air flow value is specifically configured to:

[0109] determining an excess air coefficient based on the target exhaust oxygen concentration value;

[0110] A fresh intake air flow rate value of the fresh intake pipe is determined based on the excess air coefficient, the fuel consumption of the engine, and an air-fuel ratio formula.

[0111] Optionally, the module 401 for determining the target exhaust oxygen concentration value is specifically configured to:

[0112] If the first comparison result is that the exhaust oxygen concentration value at the second exhaust port of the exhaust pipe is within a preset oxygen concentration range, determining the exhaust oxygen concentration value to be a target exhaust oxygen concentration value;

[0113] If the first comparison result is that the exhaust oxygen concentration value at the second exhaust port of the exhaust pipe is not within the preset oxygen concentration range, and the exhaust oxygen concentration value is lower than the minimum oxygen concentration value in the preset oxygen concentration range, determining the minimum oxygen concentration value as the target exhaust oxygen concentration value;

[0114] If the first comparison result is that the exhaust oxygen concentration value at the second exhaust port of the exhaust pipe is not within the preset oxygen concentration range, and the exhaust oxygen concentration value is higher than the maximum oxygen concentration value in the preset oxygen concentration range, the maximum oxygen concentration value is determined to be the target exhaust oxygen concentration value.

[0115] Optionally, the EGR flow value determination module 404 is specifically configured to:

[0116] The difference between the mixed gas flow rate value of the engine and the fresh intake air flow rate value is used as the EGR flow rate value of the engine.

[0117] Optionally, the mixed gas flow rate value is determined by:

[0118] determining a first product of the intake air pressure, the engine charging efficiency, the engine speed, and the engine displacement;

[0119] The ratio of the first product to the intake air temperature is used as the mixed gas flow rate value.

[0120] Optionally, the module 403 for determining a target fresh air flow value is specifically configured to:

[0121] If the second comparison result is that the circulating fuel supply of the engine is greater than the preset fuel supply, determining the fresh intake air flow value to be the target fresh intake air flow value;

[0122] If the second comparison result is that the circulating fuel supply of the engine is less than the preset fuel supply, determining the maximum value of the fresh intake air flow rate value and the first flow rate value as the target fresh intake air flow rate value; wherein the first flow rate value is an intake air flow rate value determined based on the engine speed and a preset speed-minimum intake air flow rate comparison table;

[0123] If the second comparison result is that the circulating fuel supply of the engine is equal to the preset fuel supply, the fresh intake air flow value is determined to be the target fresh intake air flow value, and the fresh intake air flow value is equal to the first flow value.

[0124] After introducing the exhaust gas recirculation (EGR) flow rate calculation method and apparatus according to an exemplary embodiment of the present application, an electronic device according to another exemplary embodiment of the present application will be introduced.

[0125] Those skilled in the art will appreciate that various aspects of the present application can be implemented as systems, methods, or program products. Therefore, various aspects of the present application can be specifically implemented in the following forms: a complete hardware implementation, a complete software implementation (including firmware, microcode, etc.), or an implementation that combines hardware and software aspects, which may be collectively referred to herein as a "circuit," "module," or "system."

[0126] In some possible implementations, the electronic device according to the present application may include at least one processor and at least one memory. The memory stores program code that, when executed by the processor, causes the processor to perform the steps of the exhaust gas recirculation (EGR) flow rate calculation method according to various exemplary embodiments of the present application described above in this specification.

[0127] Refer to the following Figure 5 The electronic device 130 according to this embodiment of the present application, ie, the above-mentioned exhaust gas recirculation EGR flow rate calculation device, will be described. Figure 5 The electronic device 130 shown is merely an example and should not limit the functions and scope of use of the embodiments of the present application.

[0128] like Figure 5 As shown, the electronic device 130 is a general electronic device. Components of the electronic device 130 may include, but are not limited to, the at least one processor 131, the at least one memory 132, and a bus 133 connecting different system components (including the memory 132 and the processor 131).

[0129] Bus 133 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, and a processor or local bus using any of a variety of bus architectures.

[0130] The memory 132 may include a readable medium in the form of a volatile memory, such as a random access memory (RAM) 1321 and / or a cache memory 1322 , and may further include a read-only memory (ROM) 1323 .

[0131] The memory 132 may also include a program / utility 1325 having a set (at least one) of program modules 1324, such program modules 1324 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0132] The electronic device 130 may also communicate with one or more external devices 134 (e.g., a keyboard, pointing device, etc.), one or more devices that enable a user to interact with the electronic device 130, and / or any device that enables the electronic device 130 to communicate with one or more other electronic devices (e.g., a router, a modem, etc.). Such communication may occur via an input / output (I / O) interface 135. Furthermore, the electronic device 130 may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network such as the Internet) via a network adapter 136. As shown, the network adapter 136 communicates with other modules of the electronic device 130 via a bus 133. It should be understood that, although not shown, other hardware and / or software modules may be used in conjunction with the electronic device 130, including but not limited to microcode, device drivers, redundant processors, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0133] In some possible embodiments, various aspects of an exhaust gas recirculation (EGR) flow calculation method provided by the present application can also be implemented in the form of a program product, which includes program code. When the program product is run on a computer device, the program code is used to enable the computer device to execute the steps of an exhaust gas recirculation (EGR) flow calculation method according to various exemplary embodiments of the present application described above in this specification.

[0134] The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0135] The program product for monitoring of the embodiment of the present application can be a portable compact disc read-only memory (CD-ROM) and include program code, and can be run on an electronic device. However, the program product of the present application is not limited thereto. In this document, a readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0136] A readable signal medium may include a data signal transmitted in baseband or as part of a carrier wave, which carries readable program code. Such a transmitted data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A readable signal medium may also be any readable medium other than a readable storage medium that can transmit, propagate, or transfer a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0137] The program code embodied on the readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0138] The program code for performing the operations of the present application can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code can be executed entirely on the user electronic device, partially on the user device, as a separate software package, partially on the user electronic device and partially on a remote electronic device, or entirely on the remote electronic device or server. In cases involving remote electronic devices, the remote electronic device can be connected to the user electronic device through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external electronic device (for example, using an Internet service provider to connect through the Internet).

[0139] It should be noted that although several units or subunits of the device are mentioned in the detailed description above, this division is merely exemplary and not mandatory. In fact, depending on the embodiment of the application, the features and functions of two or more units described above can be embodied in a single unit. Conversely, the features and functions of a single unit described above can be further divided and embodied by multiple units.

[0140] Furthermore, although the operations of the method of the present application are described in a particular order in the accompanying drawings, this does not require or imply that the operations must be performed in this particular order, or that all illustrated operations must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps.

[0141] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0142] The present application is described with reference to the flowcharts and block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowcharts and block diagrams, as well as the combination of processes and boxes in the flowcharts and block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts. Figure 1 A process or multiple processes and boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0143] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and boxes Figure 1 The function specified in one or more boxes.

[0144] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 A process or multiple processes and boxes Figure 1 The steps for the function specified in one or more boxes.

[0145] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0146] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A method for calculating exhaust gas recirculation (EGR) flow rate, characterized in that: The invention is applied to a gas circulation system, the gas circulation system comprising a fresh air intake pipe, a mixed air intake pipe, an exhaust pipe, an EGR pipe and an engine; wherein the air intake of the engine is connected to the exhaust port of the mixed air intake pipe, and the exhaust port of the engine is connected to the air intake of the exhaust pipe; the air intake of the mixed air intake pipe is respectively connected to the exhaust port of the EGR pipe and the exhaust port of the fresh air intake pipe; the first exhaust port of the exhaust pipe is connected to the air intake of the EGR pipe, and the second exhaust port of the exhaust pipe is connected to a post-processing device; the method comprises: Comparing the exhaust oxygen concentration value at the second exhaust port of the exhaust pipe with a preset oxygen concentration range to obtain a first comparison result, and determining a target exhaust oxygen concentration value according to the first comparison result; determining a fresh intake air flow rate value of the fresh intake pipe based on the target exhaust oxygen concentration value and the fuel consumption value of the engine; Comparing the circulating fuel supply of the engine with a preset fuel supply to obtain a second comparison result, and determining a target fresh intake air flow value based on the second comparison result and the fresh intake air flow value; determining an EGR flow rate value of the engine based on a mixed gas flow rate value entering the engine and the target fresh intake air flow rate value; The mixed gas flow rate value is determined based on a circulation system parameter value, an engine speed value, and an engine displacement; the circulation system parameters include an intake pressure and an intake temperature of an engine intake port.

2. The method according to claim 1, characterized in that The determining of the fresh intake air flow rate value of the fresh intake pipe based on the target exhaust oxygen concentration value and the fuel consumption of the engine includes: determining an excess air coefficient based on the target exhaust oxygen concentration value; A fresh intake air flow rate value of the fresh intake pipe is determined based on the excess air coefficient, the fuel consumption of the engine, and an air-fuel ratio formula.

3. The method according to claim 1 or 2, characterized in that Determining the target exhaust oxygen concentration value according to the first comparison result includes: If the first comparison result is that the exhaust oxygen concentration value at the second exhaust port of the exhaust pipe is within a preset oxygen concentration range, determining the exhaust oxygen concentration value to be a target exhaust oxygen concentration value; If the first comparison result is that the exhaust oxygen concentration value at the second exhaust port of the exhaust pipe is not within the preset oxygen concentration range, and the exhaust oxygen concentration value is lower than the minimum oxygen concentration value in the preset oxygen concentration range, determining the minimum oxygen concentration value as the target exhaust oxygen concentration value; If the first comparison result is that the exhaust oxygen concentration value at the second exhaust port of the exhaust pipe is not within the preset oxygen concentration range, and the exhaust oxygen concentration value is higher than the maximum oxygen concentration value in the preset oxygen concentration range, the maximum oxygen concentration value is determined to be the target exhaust oxygen concentration value.

4. The method according to claim 1, wherein The determining of the EGR flow value of the engine based on the mixed gas flow value entering the engine and the fresh intake air flow value includes: The difference between the mixed gas flow rate value of the engine and the fresh intake air flow rate value is used as the EGR flow rate value of the engine.

5. The method according to claim 1, wherein The mixed gas flow rate value is determined by the following method: determining a first product of the intake air pressure, the engine charging efficiency, the engine speed, and the engine displacement; The ratio of the first product to the intake air temperature is used as the mixed gas flow rate value.

6. The method according to claim 1, characterized in that Determining a target fresh intake air flow rate value according to the second comparison result and the fresh intake air flow rate value includes: If the second comparison result is that the circulating fuel supply of the engine is greater than the preset fuel supply, determining the fresh intake air flow value to be the target fresh intake air flow value; If the second comparison result is that the circulating fuel supply of the engine is less than the preset fuel supply, determining the maximum value of the fresh intake air flow rate value and the first flow rate value as the target fresh intake air flow rate value; wherein the first flow rate value is an intake air flow rate value determined based on the engine speed and a preset speed-minimum intake air flow rate comparison table; If the second comparison result is that the circulating fuel supply of the engine is equal to the preset fuel supply, the fresh intake air flow value is determined to be the target fresh intake air flow value, and the fresh intake air flow value is equal to the first flow value.

7. An exhaust gas recirculation (EGR) flow calculation device, characterized in that: The device comprises: a module for determining a target exhaust oxygen concentration value, configured to compare the exhaust oxygen concentration value at the second exhaust port of the exhaust pipe with a preset oxygen concentration range to obtain a first comparison result, and determine a target exhaust oxygen concentration value based on the first comparison result; a module for determining a fresh intake air flow value, configured to determine a fresh intake air flow value of a fresh intake air pipeline based on the target exhaust oxygen concentration value and the fuel consumption value of the engine; a module for determining a target fresh intake air flow rate value, configured to compare a circulating fuel supply of the engine with a preset fuel supply amount to obtain a second comparison result, and determine a target fresh intake air flow rate value based on the second comparison result and the fresh intake air flow rate value; an EGR flow value determining module, configured to determine an EGR flow value of the engine based on a mixed gas flow value entering the engine and the target fresh intake air flow value; The mixed gas flow rate value is determined based on a circulation system parameter value, an engine speed value, and an engine displacement; the circulation system parameters include an intake pressure and an intake temperature of an engine intake port.

8. The device according to claim 7, characterized in that The module for determining the fresh intake air flow value is specifically configured to: determining an excess air coefficient based on the target exhaust oxygen concentration value; A fresh intake air flow rate value of the fresh intake pipe is determined based on the excess air coefficient, the fuel consumption of the engine, and an air-fuel ratio formula.

9. An electronic device, characterized in that: The invention comprises at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the method according to any one of claims 1 to 6.

10. A computer storage medium, characterized in that The computer storage medium stores a computer program, and the computer program is used to enable a computer to execute the method according to any one of claims 1 to 6.

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