Signal diagnosis method and system for differential pressure sensor of EGR (Exhaust Gas Recirculation) system, vehicle and equipment

Abstract

The invention discloses a signal diagnosis method and system for a differential pressure sensor of an EGR system, a vehicle and equipment. The signal diagnosis method of the differential pressure sensor of the EGR system comprises the steps that whether a signal diagnosis entering condition of the differential pressure sensor is met or not is judged; if yes, whether the signal diagnosis enabling condition of the differential pressure sensor is met or not is judged; if yes, the upstream pressure of the EGR valve and the downstream pressure of the EGR valve detected by the differential pressure sensor are obtained; the upstream pressure of a gasoline engine particle trap and the inlet pressure of a gas compressor are obtained; and according to the upstream pressure of the EGR valve, the downstream pressure of the EGR valve, the upstream pressure of the gasoline engine particle trap and the inlet pressure of the gas compressor, whether the detection result of the differential pressure sensor is abnormal or not is determined. By the adoption of the method and device, after it is judged that the diagnosis condition is met, EGR upstream and downstream pressure, the upstream pressure of the gasoline engine particle trap and the inlet pressure of the gas compressor are combined for EGR pressure difference sensor upstream and downstream pressure signal diagnosis, and therefore the reliability of an EGR system is effectively improved.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a signal diagnostic method, system, vehicle, and device for a differential pressure sensor in an EGR system. Background Technology

[0002] With the continuous upgrading of automotive emission regulations, the stability and accuracy of the EGR (Exhaust Gas Recirculation) system, as a core technology for reducing nitrogen oxide emissions and improving fuel economy, are becoming increasingly critical. The EGR differential pressure sensor, as the sensing core of the EGR system, is currently only adequately tested for faults such as signal jamming, icing, and faults in the sensor's pressure tapping line. However, existing methods lack assessment of the reliability of the upstream and downstream pressure signals from the EGR differential pressure sensor. Faults in either the upstream or downstream pressure of the EGR differential pressure sensor can directly lead to deviations in EGR rate calculations, affecting engine combustion efficiency and potentially causing emissions exceeding standards. Summary of the Invention

[0003] Therefore, it is necessary to provide a signal diagnosis method, system, vehicle, and equipment for the differential pressure sensor of an EGR system to address the above-mentioned technical problems. After determining that the diagnostic conditions are met, the upstream and downstream pressure signals of the EGR differential pressure sensor are diagnosed by combining the upstream and downstream pressures of the EGR, the upstream pressure of the gasoline engine particulate filter, and the inlet pressure of the compressor, thereby effectively improving the reliability of the EGR system.

[0004] Firstly, a signal diagnostic method for a differential pressure sensor in an EGR system is provided, comprising: Determine whether the signal diagnostic entry conditions of the differential pressure sensor are met; If so, determine whether the signal diagnosis enable condition of the differential pressure sensor is met; Under the condition that the signal diagnosis enable condition of the differential pressure sensor is met, the upstream pressure of the EGR valve and the downstream pressure of the EGR valve detected by the differential pressure sensor are obtained. Obtain the upstream pressure of the gasoline engine particulate filter and the inlet pressure of the compressor; Based on the upstream pressure of the EGR valve, the downstream pressure of the EGR valve, the upstream pressure of the gasoline engine particulate filter, and the inlet pressure of the compressor, confirm whether the detection result of the differential pressure sensor is abnormal.

[0005] Furthermore, the determination of whether the signal diagnostic entry condition of the differential pressure sensor is met includes: Obtain the ambient temperature; Determine whether the ambient temperature is greater than or equal to a first predetermined temperature and less than or equal to a second predetermined temperature, wherein the first predetermined temperature is less than the second predetermined temperature; If so, determine whether the engine coolant temperature is higher than the calibrated temperature and whether the duration has reached the predetermined time; If the engine coolant temperature is greater than the calibrated temperature and the duration reaches a predetermined time, or if the ambient temperature is greater than the second predetermined temperature, then the signal diagnosis entry condition of the differential pressure sensor is determined to be met.

[0006] Furthermore, the signal diagnostic enable condition of the differential pressure sensor includes an upstream signal diagnostic enable condition and a downstream signal diagnostic enable condition. The upstream signal diagnostic enable condition of the differential pressure sensor is determined to be satisfied when the following conditions are simultaneously met: There is no circuit fault in the differential pressure sensor of the EGR system and no fault in the differential pressure sensor of the gasoline engine particulate filter. The EGR valve is fully closed; The engine exhaust flow rate fluctuation is less than the predetermined flow rate.

[0007] Furthermore, the downstream signal diagnostic enable condition of the differential pressure sensor is determined to be satisfied when the following conditions are met simultaneously: The differential pressure sensor of the EGR system has no circuit fault and the atmospheric pressure sensor has no fault. The EGR valve is fully closed and the throttle valve is fully open.

[0008] Further, confirming whether the differential pressure sensor's detection result is abnormal based on the upstream pressure of the EGR valve, the downstream pressure of the EGR valve, the upstream pressure of the gasoline engine particulate filter, and the compressor inlet pressure includes: Obtain a first difference between the upstream pressure of the EGR valve and the upstream pressure of the gasoline engine particulate filter; Based on the first difference, determine whether there is an anomaly in the upstream pressure of the EGR valve detected by the differential pressure sensor; Obtain a second difference between the downstream pressure of the EGR valve and the inlet pressure of the compressor; The second difference is used to determine whether there is an anomaly in the downstream pressure of the EGR valve detected by the differential pressure sensor.

[0009] Furthermore, obtaining the inlet pressure of the compressor includes: Obtain the intake air flow rate of the compressor; The air filter pressure loss is obtained based on the intake air flow rate. The inlet pressure of the compressor is obtained based on atmospheric pressure and the pressure loss of the air filter.

[0010] Secondly, a signal diagnostic system for a differential pressure sensor in an EGR system is provided, comprising: The diagnostic entry condition judgment module is used to determine whether the signal diagnostic entry condition of the differential pressure sensor is met. The diagnostic enable condition judgment module is used to determine whether the signal diagnostic enable condition of the differential pressure sensor is met after the diagnostic entry condition judgment module determines that the signal diagnostic entry condition of the differential pressure sensor is met. The acquisition module is used to obtain the upstream pressure of the EGR valve detected by the differential pressure sensor and the downstream pressure of the EGR valve, as well as the upstream pressure of the gasoline engine particulate filter and the inlet pressure of the compressor, when the signal diagnosis enable condition of the differential pressure sensor is met. The diagnostic module is used to confirm whether the detection results of the differential pressure sensor are abnormal based on the upstream pressure of the EGR valve, the downstream pressure of the EGR valve, the upstream pressure of the gasoline engine particulate filter, and the inlet pressure of the compressor.

[0011] Thirdly, a vehicle is provided, comprising: a signal diagnostic system for a differential pressure sensor of the EGR system according to the second aspect described above.

[0012] Fourthly, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the steps of a signal diagnosis method for a differential pressure sensor of an EGR system according to the first aspect and any possible implementation of the first aspect.

[0013] Fifthly, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps of a signal diagnosis method for a differential pressure sensor of an EGR system according to the first aspect and any possible implementation thereof.

[0014] In the embodiments of this application, it is first determined whether the signal diagnosis entry condition of the differential pressure sensor is met; if so, it is determined whether the signal diagnosis enable condition of the differential pressure sensor is met; if the signal diagnosis enable condition of the differential pressure sensor is met, the upstream pressure and downstream pressure of the EGR valve detected by the differential pressure sensor are obtained; then, the upstream pressure of the gasoline engine particulate filter and the inlet pressure of the compressor are obtained; finally, based on the upstream pressure of the EGR valve, the downstream pressure of the EGR valve, the upstream pressure of the gasoline engine particulate filter, and the inlet pressure of the compressor, it is confirmed whether the detection result of the differential pressure sensor is abnormal. Therefore, after determining that the diagnostic conditions are met, the upstream and downstream pressure signals of the EGR differential pressure sensor are diagnosed by combining the upstream and downstream pressures of the EGR, the upstream pressure of the gasoline engine particulate filter, and the inlet pressure of the compressor, thereby effectively improving the reliability of the EGR system. Attached Figure Description

[0015] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 A flowchart illustrating the signal diagnostic method for the differential pressure sensor of the EGR system provided in this application embodiment; Figure 2 A structural block diagram of the signal diagnostic system for the differential pressure sensor of the EGR system provided in this application embodiment; Figure 3 This is a structural block diagram of a computer device provided in an embodiment of this application. Detailed Implementation

[0016] The present application will now be described in further detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the application. Furthermore, it should be noted that, for ease of description, only the parts relevant to the application are shown in the accompanying drawings.

[0017] It should be noted that, unless otherwise specified, the embodiments and features of the embodiments in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] The following describes in detail, with reference to the accompanying drawings, a signal diagnostic method, system, vehicle, and device for the differential pressure sensor of an EGR system according to embodiments of this application.

[0019] Figure 1 This is a flowchart of a signal diagnostic method for a differential pressure sensor in an EGR system according to an embodiment of this application. Figure 1 As shown, the signal diagnosis method for the differential pressure sensor of the EGR system according to an embodiment of this application includes the following steps: S101: Determine whether the signal diagnosis entry conditions of the differential pressure sensor are met.

[0020] In one embodiment of this application, determining whether the signal diagnostic entry condition of the differential pressure sensor is met includes: obtaining the ambient temperature; determining whether the ambient temperature is greater than or equal to a first predetermined temperature and less than or equal to a second predetermined temperature, wherein the first predetermined temperature is less than the second predetermined temperature; if so, determining whether the engine coolant temperature is greater than a calibrated temperature and whether the duration reaches a predetermined time; if the engine coolant temperature is greater than the calibrated temperature and the duration reaches the predetermined time, or if the ambient temperature is greater than the second predetermined temperature, then determining that the signal diagnostic entry condition of the differential pressure sensor is met.

[0021] In a specific example, when the ambient temperature is in the range of -10℃ to 1.5℃, it is determined whether the engine coolant temperature is greater than 60℃ and lasts for more than 60 seconds. Alternatively, when the ambient temperature is greater than 1.5℃, the risk of the differential pressure sensor freezing can be ruled out, thus meeting the signal diagnosis entry conditions of the differential pressure sensor.

[0022] S102: If yes, determine whether the signal diagnosis enable condition of the differential pressure sensor is met.

[0023] In one embodiment of this application, the signal diagnostic enable condition of the differential pressure sensor includes an upstream signal diagnostic enable condition and a downstream signal diagnostic enable condition of the differential pressure sensor. The upstream signal diagnostic enable condition of the differential pressure sensor is determined to be satisfied when the following conditions are simultaneously met: the differential pressure sensor of the EGR system has no circuit fault and the differential pressure sensor of the gasoline engine particulate filter has no fault; the EGR valve is fully closed; and the engine exhaust flow fluctuation is less than a predetermined flow rate.

[0024] Specifically, the absence of circuit faults in the differential pressure sensor of the EGR system and the differential pressure sensor of the gasoline engine particulate filter is to avoid misjudgment caused by the reasonableness of the upstream signal of the differential pressure sensor; the EGR valve is fully closed to ensure that there is no gas flow in the EGR system; and the engine exhaust flow fluctuation is less than the predetermined flow to avoid drastic changes in exhaust flow causing drastic changes in exhaust pressure, which could lead to misjudgment.

[0025] In one embodiment of this application, the downstream signal diagnostic enable condition of the differential pressure sensor is determined to be met when the following conditions are met simultaneously: the differential pressure sensor of the EGR system has no circuit fault and the atmospheric pressure sensor has no fault; the EGR valve is fully closed and the throttle valve is fully open.

[0026] The function of fully opening the throttle valve is to make the compressor inlet pressure equal to atmospheric pressure minus the air filter pressure loss.

[0027] S103: Under the condition that the signal diagnosis enable condition of the differential pressure sensor is met, obtain the upstream pressure of the EGR valve and the downstream pressure of the EGR valve detected by the differential pressure sensor.

[0028] S104: Obtain the upstream pressure of the gasoline engine particulate filter and the inlet pressure of the compressor.

[0029] In one embodiment of this application, obtaining the inlet pressure of the compressor includes: obtaining the intake flow rate of the compressor; obtaining the air filter pressure loss based on the intake flow rate; and obtaining the inlet pressure of the compressor based on the atmospheric pressure and the air filter pressure loss.

[0030] The process involves pre-calibrating the relationship between intake flow rate and air filter pressure loss through experiments, and then obtaining the air filter pressure loss by looking up a table based on the intake flow rate. Finally, the compressor inlet pressure is obtained by subtracting the air filter pressure loss from the atmospheric pressure.

[0031] S105: Based on the upstream pressure of the EGR valve, the downstream pressure of the EGR valve, the upstream pressure of the gasoline engine particulate filter, and the inlet pressure of the compressor, confirm whether the detection result of the differential pressure sensor is abnormal.

[0032] In one embodiment of this application, confirming whether the detection result of the differential pressure sensor is abnormal based on the upstream pressure of the EGR valve, the downstream pressure of the EGR valve, the upstream pressure of the gasoline engine particulate filter, and the inlet pressure of the compressor includes: obtaining a first difference between the upstream pressure of the EGR valve and the upstream pressure of the gasoline engine particulate filter; determining whether the upstream pressure of the EGR valve detected by the differential pressure sensor is abnormal based on the first difference; obtaining a second difference between the downstream pressure of the EGR valve and the inlet pressure of the compressor; and determining whether the downstream pressure of the EGR valve detected by the differential pressure sensor is abnormal based on the second difference.

[0033] Specifically, a first difference threshold and a second difference threshold are set. If the absolute value of the first difference is greater than the first difference threshold, it is considered that the upstream pressure of the EGR valve detected by the differential pressure sensor is abnormal. Similarly, if the absolute value of the second difference is greater than the second difference threshold, it is considered that the downstream pressure of the EGR valve detected by the differential pressure sensor is abnormal.

[0034] According to the signal diagnosis method of the differential pressure sensor of the EGR system in this application embodiment, the method first determines whether the signal diagnosis entry condition of the differential pressure sensor is met; if so, it determines whether the signal diagnosis enable condition of the differential pressure sensor is met; if the signal diagnosis enable condition of the differential pressure sensor is met, the method obtains the upstream pressure and downstream pressure of the EGR valve detected by the differential pressure sensor; then, it obtains the upstream pressure of the gasoline engine particulate filter and the inlet pressure of the compressor; finally, based on the upstream pressure of the EGR valve, the downstream pressure of the EGR valve, the upstream pressure of the gasoline engine particulate filter, and the inlet pressure of the compressor, it confirms whether the detection result of the differential pressure sensor is abnormal. Therefore, after determining that the diagnosis conditions are met, the method combines the upstream and downstream pressures of the EGR, the upstream pressure of the gasoline engine particulate filter, and the inlet pressure of the compressor to diagnose the upstream and downstream pressure signals of the EGR differential pressure sensor, thereby effectively improving the reliability of the EGR system.

[0035] Figure 2 This is a structural block diagram of a signal diagnostic system for a differential pressure sensor in an EGR system according to an embodiment of this application. Figure 2As shown, the signal diagnostic system for the differential pressure sensor of the EGR system according to an embodiment of this application includes: a diagnostic entry condition judgment module 210, a diagnostic enable condition judgment module 220, an acquisition module 230, and a diagnostic module 240, wherein: The diagnostic entry condition judgment module 210 is used to determine whether the signal diagnostic entry condition of the differential pressure sensor is met. The diagnostic enable condition judgment module 220 is used to determine whether the signal diagnostic enable condition of the differential pressure sensor is met after the diagnostic entry condition judgment module determines that the signal diagnostic entry condition of the differential pressure sensor is met. The acquisition module 230 is used to obtain the upstream pressure of the EGR valve detected by the differential pressure sensor and the downstream pressure of the EGR valve, as well as the upstream pressure of the gasoline engine particulate filter and the inlet pressure of the compressor, when the signal diagnosis enable condition of the differential pressure sensor is met. The diagnostic module 240 is used to confirm whether the detection results of the differential pressure sensor are abnormal based on the upstream pressure of the EGR valve, the downstream pressure of the EGR valve, the upstream pressure of the gasoline engine particulate filter, and the inlet pressure of the compressor.

[0036] According to the signal diagnostic system of the differential pressure sensor of the EGR system in this application embodiment, the system first determines whether the signal diagnostic entry condition of the differential pressure sensor is met; if so, it determines whether the signal diagnostic enable condition of the differential pressure sensor is met; if the signal diagnostic enable condition of the differential pressure sensor is met, the system obtains the upstream pressure and downstream pressure of the EGR valve detected by the differential pressure sensor; then it obtains the upstream pressure of the gasoline engine particulate filter and the inlet pressure of the compressor; finally, based on the upstream pressure of the EGR valve, the downstream pressure of the EGR valve, the upstream pressure of the gasoline engine particulate filter, and the inlet pressure of the compressor, it confirms whether the detection result of the differential pressure sensor is abnormal. Therefore, after determining that the diagnostic conditions are met, the system performs upstream and downstream pressure signal diagnosis of the EGR differential pressure sensor by combining the upstream and downstream pressures of the EGR, the upstream pressure of the gasoline engine particulate filter, and the inlet pressure of the compressor, thereby effectively improving the reliability of the EGR system.

[0037] Specific limitations regarding the signal diagnostic system for the differential pressure sensor of the EGR system can be found in the above-described limitations on the signal diagnostic method for the differential pressure sensor of the EGR system, and will not be repeated here. Each module of the aforementioned signal diagnostic system for the differential pressure sensor of the EGR system can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of the computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0038] In one embodiment, a vehicle is provided, comprising: a signal diagnostic system for a differential pressure sensor of an EGR system according to any of the above embodiments. The vehicle first determines whether the signal diagnostic entry condition for the differential pressure sensor is met; if so, it determines whether the signal diagnostic enable condition for the differential pressure sensor is met; if the signal diagnostic enable condition for the differential pressure sensor is met, the vehicle obtains the upstream pressure and downstream pressure of the EGR valve detected by the differential pressure sensor; then, it obtains the upstream pressure of the gasoline engine particulate filter and the inlet pressure of the compressor; finally, based on the upstream pressure of the EGR valve, the downstream pressure of the EGR valve, the upstream pressure of the gasoline engine particulate filter, and the inlet pressure of the compressor, it confirms whether the detection result of the differential pressure sensor is abnormal. Therefore, after determining that the diagnostic conditions are met, the upstream and downstream pressure signals of the EGR differential pressure sensor are diagnosed by combining the upstream and downstream pressures of the EGR system, the upstream pressure of the gasoline engine particulate filter, and the inlet pressure of the compressor, thereby effectively improving the reliability of the EGR system.

[0039] Furthermore, other components and functions of the vehicle according to the embodiments of this application are known to those skilled in the art and will not be described in detail here.

[0040] In one embodiment, a computer device is provided. Figure 3 This is a structural block diagram of the computer device provided in the embodiments of this application, with reference to... Figure 3 The computer device includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the aforementioned embodiment of the signal diagnosis method for the differential pressure sensor of the EGR system. For example, it performs the following: determining whether the signal diagnosis entry conditions of the differential pressure sensor are met; If so, determine whether the signal diagnosis enable condition of the differential pressure sensor is met; Under the condition that the signal diagnosis enable condition of the differential pressure sensor is met, the upstream pressure of the EGR valve and the downstream pressure of the EGR valve detected by the differential pressure sensor are obtained. Obtain the upstream pressure of the gasoline engine particulate filter and the inlet pressure of the compressor; Based on the upstream pressure of the EGR valve, the downstream pressure of the EGR valve, the upstream pressure of the gasoline engine particulate filter, and the inlet pressure of the compressor, confirm whether the detection result of the differential pressure sensor is abnormal.

[0041] This application also provides a computer-readable storage medium storing a computer program. When the processor executes the computer program, it implements the aforementioned embodiment of the signal diagnosis method for the differential pressure sensor of the EGR system. For example, it performs the following: determining whether the signal diagnosis entry conditions of the differential pressure sensor are met; If so, determine whether the signal diagnosis enable condition of the differential pressure sensor is met; Under the condition that the signal diagnosis enable condition of the differential pressure sensor is met, the upstream pressure of the EGR valve and the downstream pressure of the EGR valve detected by the differential pressure sensor are obtained. Obtain the upstream pressure of the gasoline engine particulate filter and the inlet pressure of the compressor; Based on the upstream pressure of the EGR valve, the downstream pressure of the EGR valve, the upstream pressure of the gasoline engine particulate filter, and the inlet pressure of the compressor, confirm whether the detection result of the differential pressure sensor is abnormal.

[0042] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the methods described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0043] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A signal diagnostic method for a differential pressure sensor in an EGR system, characterized in that, include: Determine whether the signal diagnostic entry conditions of the differential pressure sensor are met; If so, determine whether the signal diagnosis enable condition of the differential pressure sensor is met; Under the condition that the signal diagnosis enable condition of the differential pressure sensor is met, the upstream pressure of the EGR valve and the downstream pressure of the EGR valve detected by the differential pressure sensor are obtained. Obtain the upstream pressure of the gasoline engine particulate filter and the inlet pressure of the compressor; Based on the upstream pressure of the EGR valve, the downstream pressure of the EGR valve, the upstream pressure of the gasoline engine particulate filter, and the inlet pressure of the compressor, confirm whether the detection result of the differential pressure sensor is abnormal.

2. The signal diagnosis method for the differential pressure sensor of the EGR system according to claim 1, characterized in that, The determination of whether the signal diagnostic entry conditions of the differential pressure sensor are met includes: Obtain the ambient temperature; Determine whether the ambient temperature is greater than or equal to a first predetermined temperature and less than or equal to a second predetermined temperature, wherein the first predetermined temperature is less than the second predetermined temperature; If so, determine whether the engine coolant temperature is higher than the calibrated temperature and whether the duration has reached the predetermined time; If the engine coolant temperature is greater than the calibrated temperature and the duration reaches a predetermined time, or if the ambient temperature is greater than the second predetermined temperature, then the signal diagnosis entry condition of the differential pressure sensor is determined to be met.

3. The signal diagnosis method for the differential pressure sensor of the EGR system according to claim 1, characterized in that, The signal diagnostic enable conditions of the differential pressure sensor include upstream signal diagnostic enable conditions and downstream signal diagnostic enable conditions. The upstream signal diagnostic enable condition of the differential pressure sensor is determined to be satisfied when the following conditions are simultaneously met: There is no circuit fault in the differential pressure sensor of the EGR system and no fault in the differential pressure sensor of the gasoline engine particulate filter. The EGR valve is fully closed; The engine exhaust flow rate fluctuates less than the predetermined flow rate.

4. The signal diagnosis method for the differential pressure sensor of the EGR system according to claim 3, characterized in that, The downstream signal diagnostic enable condition of the differential pressure sensor is determined to be satisfied when the following conditions are met simultaneously: The differential pressure sensor of the EGR system has no circuit fault and the atmospheric pressure sensor has no fault. The EGR valve is fully closed and the throttle valve is fully open.

5. The signal diagnosis method for the differential pressure sensor of the EGR system according to any one of claims 1-4, characterized in that, The step of confirming whether the differential pressure sensor's detection result is abnormal based on the upstream pressure of the EGR valve, the downstream pressure of the EGR valve, the upstream pressure of the gasoline engine particulate filter, and the compressor inlet pressure includes: Obtain a first difference between the upstream pressure of the EGR valve and the upstream pressure of the gasoline engine particulate filter; Based on the first difference, determine whether there is an anomaly in the upstream pressure of the EGR valve detected by the differential pressure sensor; Obtain a second difference between the downstream pressure of the EGR valve and the inlet pressure of the compressor; The second difference is used to determine whether there is an anomaly in the downstream pressure of the EGR valve detected by the differential pressure sensor.

6. The signal diagnosis method for the differential pressure sensor of the EGR system according to claim 5, characterized in that, The process of obtaining the compressor inlet pressure includes: Obtain the intake air flow rate of the compressor; The air filter pressure loss is obtained based on the intake air flow rate. The inlet pressure of the compressor is obtained based on atmospheric pressure and the pressure loss of the air filter.

7. A signal diagnostic system for a differential pressure sensor in an EGR system, characterized in that, include: The diagnostic entry condition judgment module is used to determine whether the signal diagnostic entry condition of the differential pressure sensor is met. The diagnostic enable condition judgment module is used to determine whether the signal diagnostic enable condition of the differential pressure sensor is met after the diagnostic entry condition judgment module determines that the signal diagnostic entry condition of the differential pressure sensor is met. The acquisition module is used to obtain the upstream pressure of the EGR valve detected by the differential pressure sensor and the downstream pressure of the EGR valve, as well as the upstream pressure of the gasoline engine particulate filter and the inlet pressure of the compressor, when the signal diagnosis enable condition of the differential pressure sensor is met. The diagnostic module is used to confirm whether the detection results of the differential pressure sensor are abnormal based on the upstream pressure of the EGR valve, the downstream pressure of the EGR valve, the upstream pressure of the gasoline engine particulate filter, and the inlet pressure of the compressor.

8. A vehicle, characterized in that, include: The signal diagnostic system for the differential pressure sensor of the EGR system according to claim 7.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the signal diagnosis method for the differential pressure sensor of the EGR system according to any one of claims 1-6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the signal diagnosis method for the differential pressure sensor of the EGR system according to any one of claims 1-6.

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