EGR (Exhaust Gas Recirculation) filter screen blockage judgment method, device and equipment

Abstract

The invention relates to the technical field of automobile EGR systems, in particular to an EGR filter screen blockage judgment method, device and equipment. An EGR filter screen blocking judgment method comprises the steps that the first gas flow passing through a filter screen is calculated through data collected by a sensor deployed in an EGR system; according to the first gas flow, the blocking degree value of the filter screen is determined from a preset flow blocking corresponding relation table; and when the blockage degree value of the filter screen reaches a preset blockage threshold value, displaying prompt information to prompt a user to process the filter screen. According to the invention, data can be called for diagnosis and analysis during normal operation of the engine, specific working condition diagnosis is not needed, and the operation oil consumption of the engine is not influenced. The reliability of diagnosing the filter screen blockage problem through the established model flow result is high, the common wrong diagnosis problems such as misdiagnosis and missed diagnosis can be effectively avoided, the filter screen blockage degree can be fed back in real time, and a user can be reminded to clean or replace the filter screen in time.

Description

Technical Field

[0001] The present application relates to the technical field of automotive EGR systems, and particularly to a method, device and equipment for judging the clogging of an EGR filter screen. Background Art

[0002] The Exhaust Gas Recirculation (EGR) system is an exhaust gas recirculation system for internal combustion engines. Its main function is to introduce a part of the exhaust gas into the combustion process of the engine to adjust and control the intake air volume of fresh air.

[0003] Since the exhaust gas at the EGR air intake port is generally dirty, a filter screen can effectively intercept particulate matter in the exhaust gas and improve the quality of the air-fuel mixture entering the engine. However, the filter screen is also prone to clogging due to the deposition of particulate matter such as carbon deposits and dust. After the filter screen is severely clogged, the EGR system cannot work properly, resulting in increased engine fuel consumption and deteriorated emissions.

[0004] In the related art, the diagnosis of the EGR system mostly focuses on the diagnosis of EGR valve faults, and less attention is paid to the diagnosis of the filter screen of the EGR system with a filter screen, resulting in the inability to detect filter screen clogging in time. Summary of the Invention

[0005] Embodiments of the present invention provide a method, device and equipment for judging the clogging of an EGR filter screen to solve the problem that the clogging of the EGR filter screen in the prior art cannot be detected in time.

[0006] In a first aspect, embodiments of the present invention provide a method for judging the clogging of an EGR filter screen, including: Calculating a first gas flow rate passing through the filter screen based on the data collected by sensors deployed in the Exhaust Gas Recirculation (EGR) system; Determining a clogging degree value of the filter screen from a preset flow clogging correspondence table according to the first gas flow rate; When the clogging degree value of the filter screen reaches a preset clogging threshold, displaying a prompt message to prompt the user to process the filter screen.

[0007] Optionally, the method further includes: pre-establishing a flow clogging correspondence table, including: Simulating working conditions with different clogging degrees of the filter screen on a test bench and respectively measuring a second gas flow rate passing through the filter screen under each working condition; Calculating a first gas flow rate passing through the filter screen under each working condition based on the data collected by sensors deployed in the EGR; Establishing the flow clogging correspondence table according to the calculated first gas flow rate, the measured second gas flow rate, and the clogging degree under the corresponding working condition.

[0008] Optionally, calculating the first gas flow rate through the filter screen based on the data collected by the sensors deployed in the EGR, including: Obtaining the pre-pressure value of the filter screen through the pre-pressure sensor of the gasoline engine particulate filter GPF; Obtaining the post-pressure value of the filter screen through the pre-pressure sensor of the EGR valve; Determining the first gas flow rate through the filter screen based on the difference between the cross-sectional area of the filter screen and the cross-sectional area of the intercooler air passage, the gas temperature value, and the pre-pressure value and post-pressure value of the filter screen.

[0009] Optionally, establishing the flow-blockage correspondence table based on the calculated first gas flow rate, the measured second gas flow rate, and the blockage degree under the corresponding working conditions, including: Respectively determining the difference between the first gas flow rate and the second gas flow rate under each working condition; When the difference does not exceed the preset threshold, directly establishing the correspondence between the first gas flow rate, the second gas flow rate, and the blockage degree under the corresponding working condition; When the difference exceeds the preset threshold, after correcting the correspondence between the first gas flow rate and the second gas flow rate through the flow correction table, establishing the correspondence between the first gas flow rate, the second gas flow rate, and the blockage degree under the corresponding working condition.

[0010] Optionally, determining the blockage degree value of the filter screen based on the first gas flow rate from the preset flow-blockage correspondence table, including: Determining the second gas flow rate corresponding to the first gas flow rate from the flow-blockage correspondence table according to the first gas flow rate; Determining the blockage degree of the filter screen corresponding to the second gas flow rate as the blockage degree value of the filter screen.

[0011] In a second aspect, an embodiment of the present invention provides an EGR filter screen blockage determination device, where the device includes: A calculation module that calculates the first gas flow rate through the filter screen based on the data collected by the sensors deployed in the exhaust gas recirculation system EGR; A determination module that determines the blockage degree value of the filter screen from the preset flow-blockage correspondence table according to the first gas flow rate; A prompt module that displays a prompt message to prompt the user to process the filter screen when the blockage degree value of the filter screen reaches the preset blockage threshold.

[0012] Optionally, the method further includes: pre-establishing a flow-blockage correspondence table, including: Simulate the working conditions of different blockage degrees of the filter screen on the test bench, and measure the second gas flow rate passing through the filter screen under each working condition respectively; Calculate the first gas flow rate passing through the filter screen under each working condition respectively based on the data collected by the sensors deployed in the EGR; Establish the flow-blockage correspondence table according to the calculated first gas flow rate, the measured second gas flow rate, and the blockage degree under the corresponding working condition.

[0013] Optionally, determining the blockage degree value of the filter screen from a preset flow-blockage correspondence table according to the first gas flow rate includes: Determine the second gas flow rate corresponding to the first gas flow rate from the flow-blockage correspondence table according to the first gas flow rate; Determine the blockage degree of the filter screen corresponding to the second gas flow rate as the blockage degree value of the filter screen.

[0014] In a third aspect, an embodiment of the present invention provides an electronic device, including: At least one processor; and At least one memory communicatively connected to the processor, wherein: The memory stores program instructions executable by the processor, and the processor can execute the method according to any one of the first aspects by invoking the program instructions.

[0015] In a fourth aspect, an embodiment of the present invention provides a storage medium, the storage medium includes a stored program, wherein when the program runs, it controls the device where the storage medium is located to execute the method according to any one of the first aspects.

[0016] In the embodiment of the present invention, a pressure field before and after the filter screen is established based on the existing sensors in the EGR system, the gas flow rate passing through the filter screen is calculated without affecting the normal operation of the engine, and the actual blockage condition of the filter screen is determined based on the blockage model established in advance on the test bench.

[0017] The present invention can retrieve data for diagnostic analysis during the normal operation of the engine, does not require specific working condition diagnosis, and does not affect the fuel consumption of the engine operation. At the same time, pressure acquisition is performed based on the existing GPF differential pressure sensor and EGR differential pressure sensor, without increasing the user cost.

[0018] By building a refined model and validating data on a test bench, the degree of EGR filter clogging can be accurately estimated. After the vehicle runs normally, the filter clogging situation will be reported and the customer will be reminded to replace the filter. By establishing a model flow result to diagnose filter clogging problems, the reliability is high, effectively avoiding common misdiagnosis problems such as misdiagnosis and missed diagnosis, and being able to provide real-time feedback on the degree of filter clogging and timely remind users to clean or replace the filter. Brief Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 The figure shows a flowchart of a method for judging EGR filter clogging provided by an embodiment of the present application; Figure 2 The figure shows a structural schematic diagram of a device for judging EGR filter clogging provided by an embodiment of the present application; Figure 3 The figure shows a structural schematic diagram of an electronic device provided by an embodiment of the present application. Detailed Embodiments

[0021] To better understand the technical solutions of the present application, the embodiments of the present application will be described in detail below with reference to the drawings.

[0022] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0023] This method uses the data of the existing pressure sensors of the engine to establish a model for analyzing and diagnosing filter clogging faults. This invention is applicable to engines with clogged EGR intake filters.

[0024] This EGR filter clogging diagnosis method can report that the filter is clogged and the degree of clogging, and remind the user to replace the filter in time to ensure the efficient operation of the engine.

[0025] The EGR system is an exhaust gas recirculation system for internal combustion engines. Its main function is to introduce a part of the exhaust gas into the combustion process of the engine to adjust and control the intake amount of fresh air.

[0026] Since the exhaust gas at the EGR air intake port is generally dirty, a filter screen can effectively intercept particulate matter in the exhaust gas and improve the quality of the air-fuel mixture in the intake engine. However, the filter screen is also prone to clogging caused by the deposition of particulate matter such as carbon deposits and dust. After the filter screen is severely clogged, the EGR system cannot work properly, resulting in increased engine fuel consumption and deteriorated emissions.

[0027] In the related art, the diagnosis of the EGR system mostly focuses on the fault diagnosis of the EGR valve, and less attention is paid to the diagnosis of the filter screen of the EGR system with a filter screen, resulting in the inability to detect filter screen clogging in a timely manner.

[0028] This method uses the data of the existing pressure sensors of the engine to establish a model for analyzing and diagnosing the filter screen clogging fault. The invention is applicable to engines with clogged EGR air intake filters.

[0029] As Figure 1 shown, it is a flowchart of a method for judging EGR filter screen clogging provided by an embodiment of the present invention. Refer to Figure 1 , the specific steps of the method include: S101, calculate the first gas flow rate passing through the filter screen based on the data collected by the sensors deployed in the exhaust gas recirculation system EGR.

[0030] Specifically, a pressure sensor before the gasoline particulate filter (GPF) and a pressure sensor before the EGR valve are deployed on the EGR system. The front pressure value of the filter screen can be obtained through the GPF sensor, and the rear pressure value of the filter screen can be obtained through the pressure sensor before the EGR valve.

[0031] According to the front and rear pressure values of the filter screen collected by the two sensors before and after the filter screen, the difference between the cross-sectional area of the filter screen and the area of the intercooler, and the gas temperature value obtained by the temperature sensor before the filter screen, calculate the first gas flow rate passing through the filter screen.

[0032] In a specific embodiment, the first gas flow rate passing through the filter screen can be calculated by the Bernoulli equation. Optionally, the first gas flow rate passing through the filter screen can also be calculated by other implementable methods, and the embodiments of the present invention do not make specific limitations here.

[0033] S102, determine the clogging degree value of the filter screen from a preset flow clogging correspondence table according to the first gas flow rate.

[0034] Specifically, a preset flow blockage correspondence table is stored in the vehicle. The flow blockage correspondence table consists of several sets of correspondences between the first gas flow rate, the second gas flow rate, and the blockage degree. Among them, the first gas flow rate is the gas flow rate calculated based on the pressure fields before and after the filter screen through a formula, and the second gas flow rate is the actually measured gas flow rate.

[0035] Based on the first gas flow rate calculated through S101, the second gas flow rate corresponding to the first gas flow rate is determined from the flow blockage correspondence table. And the blockage degree corresponding to the second gas flow rate in the flow blockage correspondence table is determined as the final required blockage degree value.

[0036] Among them, in the embodiment of the present invention, it is necessary to pre - establish the flow blockage correspondence table and complete its storage in the vehicle for the user to read and call.

[0037] Specifically, during the bench test, gaskets with different apertures are used on the bench to simulate the working conditions of different blockage degrees of the filter screen. And the second gas flow rate passing through the filter screen under the corresponding working conditions is measured respectively.

[0038] Based on the data collected by the sensors deployed in the EGR, the first gas flow rate passing through the filter screen under each working condition is calculated respectively. The method for calculating the first gas flow rate is the same as that in S101 and will not be elaborated here.

[0039] According to the multiple working conditions simulated for the blockage degree, based on the calculated several sets of first gas flow rates and the actually measured several sets of second gas flow rates, the establishment of the flow blockage correspondence table is completed.

[0040] Optionally, in some embodiments, when establishing the correspondence between the first gas flow rate and the second gas flow rate, the correspondence may deviate due to errors. Therefore, it is necessary to correct the deviation between the first gas flow rate and the second gas flow rate.

[0041] Specifically, under the working conditions of each blockage degree in sequence, the difference between the first gas flow rate and the second gas flow rate is calculated. When the difference does not exceed the preset threshold, the correspondence between the first gas flow rate, the second gas flow rate, and the blockage degree under the corresponding working condition is directly established; when the difference exceeds the preset threshold, after correcting the deviation between the first gas flow rate and the second gas flow rate through the flow correction table, the correspondence between the first gas flow rate, the second gas flow rate, and the blockage degree under the corresponding working condition is established.

[0042] S103, when the blockage degree value of the filter screen reaches the preset blockage threshold, display a prompt message to prompt the user to process the filter screen.

[0043] Specifically, when the clogging degree value reaches a preset clogging threshold, a warning light is lit on the vehicle instrument and a warning message is displayed to prompt the user to clean the filter screen or replace the filter screen in a timely manner.

[0044] In an embodiment of the present invention, a pressure field before and after the filter screen is established based on the existing sensors of the EGR system, the gas flow rate passing through the filter screen is calculated without affecting the normal operation of the engine, and the actual clogging condition of the filter screen is determined based on a clogging model established in advance on a test bench.

[0045] The present invention can retrieve data for diagnostic analysis during the normal operation of the engine, does not require specific working conditions for diagnosis, and does not affect the fuel consumption of the engine operation. At the same time, pressure acquisition is performed based on the existing GPF differential pressure sensor and EGR differential pressure sensor, without increasing the user cost.

[0046] By performing refined model construction and data verification on a test bench, the clogging degree of the EGR filter screen can be accurately estimated. After the vehicle runs normally, the clogging condition of the filter screen will be feedback and the customer will be reminded to replace the filter screen. The reliability of diagnosing the clogging problem of the filter screen through the model flow result is high, which can effectively avoid common misdiagnosis problems such as misdiagnosis and missed diagnosis, and can real-time feedback the clogging degree of the filter screen and timely remind the user to clean or replace the filter screen.

[0047] Corresponding to the above EGR filter screen clogging judgment method, an embodiment of the present application further provides an EGR filter screen clogging judgment device. Refer to Figure 2 , which is a schematic structural diagram of an EGR filter screen clogging judgment device provided by an embodiment of the present application. The EGR filter screen clogging judgment device may include: a balancing module 201, a first determination module 202, and a second determination module 203.

[0048] A calculation module 201 calculates a first gas flow rate passing through the filter screen based on the data collected by the sensors deployed in the exhaust gas recirculation system EGR; A determination module 202 determines the clogging degree value of the filter screen from a preset flow clogging correspondence table according to the first gas flow rate; A prompt module 203 displays a prompt message to prompt the user to process the filter screen when the clogging degree value of the filter screen reaches a preset clogging threshold.

[0049] Figure 3 This is a schematic structural diagram of an embodiment of an electronic device in this specification. As Figure 3 shown, the above electronic device may include at least one processor; and at least one memory communicatively connected to the processing unit, wherein: the memory stores program instructions executable by the processing unit, and the above processor can execute the EGR filter screen clogging judgment method provided by this embodiment by calling the above program instructions.

[0050] Among them, the above-mentioned electronic device can be a device capable of having an intelligent conversation with a user. For example: a cloud server. The embodiments of this specification do not limit the specific form of the above-mentioned electronic device. It can be understood that the electronic device here is the machine mentioned in the method embodiments.

[0051] Figure 3 A block diagram of an exemplary electronic device suitable for use in implementing the embodiments of this specification is shown. Figure 3 The electronic device shown is merely an example and should not impose any limitation on the functions and scope of use of the embodiments of this specification.

[0052] As Figure 3 shown, the electronic device is presented in the form of a general-purpose computing device. The components of the electronic device may include, but are not limited to: one or more processors 310, a communication interface 320, a memory 330, and a communication bus 340 connecting different system components (including the memory 330, the communication interface 320, and the processor 310).

[0053] The communication bus 340 represents one or more of several types of bus structures, including a memory bus or a memory controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any of the various bus structures. For example, these architectures include, but are not limited to, Industry Standard Architecture (hereinafter referred to as: ISA) bus, Micro Channel Architecture (hereinafter referred to as: MAC) bus, Enhanced ISA bus, Video Electronics Standards Association (hereinafter referred to as: VESA) local bus, and Peripheral Component Interconnection (hereinafter referred to as: PCI) bus.

[0054] The electronic device typically includes a variety of computer system-readable media. These media can be any available media that can be accessed by the electronic device, including volatile and non-volatile media, removable and non-removable media.

[0055] The memory 330 may include a computer system readable medium in the form of volatile memory, such as random access memory (RAM) and / or cache memory. The electronic device may further include other removable / non-removable, volatile / non-volatile computer system storage media. The memory 330 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of the embodiments of this specification.

[0056] A program / utility with a set (at least one) of program modules may be stored in the memory 330. Such program modules include, but are not limited to, an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include the implementation of a network environment. The program modules generally perform the functions and / or methods in the embodiments described in this specification.

[0057] The processor 310 executes various functional applications and data processing by running the programs stored in the memory 330, such as implementing the EGR filter clogging determination method provided by the embodiments shown in this specification.

[0058] The embodiments of this specification provide a non-transitory computer-readable storage medium storing computer instructions that cause the computer to execute the EGR filter clogging determination method provided by the embodiments shown in this specification.

[0059] The above non-transitory computer-readable storage medium may be any combination of one or more computer-readable media. The computer-readable media may be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium may, for example, be, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples (non-exhaustive list) of the computer-readable storage medium include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), 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 above. In this document, the computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0060] A computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries computer-readable program code. Such a propagated data signal may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the foregoing. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device.

[0061] The program code contained on a computer-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.

[0062] The computer program code for performing the operations of this specification may be written in one or more programming languages or combinations thereof. The programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also conventional procedural programming languages such as the "C" language or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, executed as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0063] The above describes specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the acts or steps recited in the claims may be performed in a different order than in the embodiments and still achieve the desired result. Additionally, the processes depicted in the figures do not necessarily require the particular order or sequential order shown to achieve the desired result. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0064] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this specification, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0065] Any process or method description, whether in a flowchart or otherwise described herein, can be understood to represent a module, segment, or portion of code including one or more executable instructions for implementing a customized logical function or process. The scope of the preferred embodiments of this specification includes additional implementations, where the functions can be executed in a substantially simultaneous manner or in the reverse order according to the involved functions, rather than in the order shown or discussed, which should be understood by those skilled in the technical field to which the embodiments of this specification pertain.

[0066] Depending on the context, the word "if" as used herein can be interpreted as "when" or "while" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detected (stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detected (stated condition or event)" or "in response to detecting (stated condition or event)".

[0067] It should be noted that the terminals involved in the embodiments of this specification can include, but are not limited to, personal computers (Personal Computer; hereinafter referred to as: PC), personal digital assistants (Personal Digital Assistant; hereinafter referred to as: PDA), wireless handheld devices, tablet computers (Tablet Computer), mobile phones, MP3 players, MP4 players, etc.

[0068] In the embodiments provided in this specification, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be in electrical, mechanical, or other forms.

[0069] In addition, each functional unit in the various embodiments of this specification can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware, or in the form of a combination of hardware and software functional units.

[0070] The integrated unit implemented in the form of software functional units can be stored in a computer-readable storage medium. The above-mentioned software functional units are stored in a storage medium and include several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to execute some steps of the methods described in the various embodiments of this specification.

[0071] The above are only the preferred embodiments of this specification and are not intended to limit this specification. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this specification shall be included within the scope of protection of this specification.

Claims

1. A method for determining whether an EGR filter is clogged, characterized in that: include: Calculate the first gas flow rate passing through the filter by using data collected by a sensor deployed in the exhaust gas recirculation system EGR; According to the first gas flow rate, determining the filter screen blockage degree value from a preset flow blockage correspondence table; When the clogging degree value of the filter reaches a preset clogging threshold, a prompt message is displayed to prompt the user to handle the filter.

2. The method according to claim 1, characterized in that The method further includes: pre-establishing a flow congestion correspondence table, including: Simulate working conditions of different blockage degrees of the filter on the test bench, and measure the flow rate of the second gas passing through the filter under each working condition; The first gas flow rate passing through the filter under various working conditions is calculated respectively through the data collected by the sensor deployed on the EGR; The flow-blockage correspondence table is established according to the calculated first gas flow, the measured second gas flow, and the blockage degree under the corresponding working conditions.

3. The method according to any one of claims 1 or 2, characterized in that: The first gas flow rate passing through the filter is calculated using data collected by the sensor deployed on the EGR, including: The front pressure value of the filter is obtained by using a front pressure sensor of a gasoline engine particulate filter GPF; Obtaining a rear pressure value of the filter screen through an EGR valve front pressure sensor; The first gas flow rate passing through the filter is determined according to the difference between the cross-sectional area of ​​the filter and the area of ​​the intercooler air duct, the gas temperature value, and the front pressure value and the rear pressure value of the filter.

4. The method according to claim 2, characterized in that: The flow blockage correspondence table is established according to the calculated first gas flow, the measured second gas flow, and the blockage degree under the corresponding working condition, including: respectively determining the difference between the first gas flow rate and the second gas flow rate under each operating condition; When the difference does not exceed a preset threshold, directly establishing a corresponding relationship between the first gas flow rate, the second gas flow rate, and the blockage degree under the corresponding working condition; When the difference exceeds a preset threshold, the correspondence between the first gas flow rate and the second gas flow rate is corrected through a flow correction table to establish a correspondence between the first gas flow rate, the second gas flow rate, and the degree of blockage under corresponding working conditions.

5. The method according to claim 1, characterized in that The determining, according to the first gas flow rate, a filter screen blockage degree value from a preset flow blockage correspondence table includes: According to the first gas flow rate, determining a second gas flow rate corresponding to the first gas flow rate from the flow blockage correspondence table; The filter blockage degree corresponding to the second gas flow rate is determined as the filter blockage degree value.

6. An EGR filter blockage judgment device, characterized in that: The device comprises: A calculation module calculates the flow rate of the first gas passing through the filter screen by using data collected by a sensor deployed in the exhaust gas recirculation system EGR; A determination module, which determines the blockage degree value of the filter from a preset flow blockage correspondence table according to the first gas flow; The prompt module displays a prompt message to prompt the user to handle the filter when the clogging degree value of the filter reaches a preset clogging threshold.

7. The device according to claim 6, characterized in that The method further includes: pre-establishing a flow congestion correspondence table, including: Simulate working conditions of different blockage degrees of the filter on the test bench, and measure the flow rate of the second gas passing through the filter under each working condition; The first gas flow rate passing through the filter under various working conditions is calculated respectively through the data collected by the sensor deployed on the EGR; The flow-blockage correspondence table is established according to the calculated first gas flow, the measured second gas flow, and the blockage degree under the corresponding working conditions.

8. The device according to claim 6, characterized in that The determining, according to the first gas flow rate, a filter screen blockage degree value from a preset flow blockage correspondence table includes: According to the first gas flow rate, determining a second gas flow rate corresponding to the first gas flow rate from the flow blockage correspondence table; The filter blockage degree corresponding to the second gas flow rate is determined as the filter blockage degree value.

9. An electronic device, characterized in that: include: at least one processor; as well as at least one memory in communication with the processor, wherein: The memory stores program instructions executable by the processor, and the processor can execute the method according to any one of claims 1 to 5 by calling the program instructions.

10. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the method according to any one of claims 1 to 5.

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