Egr system flow diagnosis method, device, equipment and storage medium

Abstract

Embodiments of the present application disclose a method, device, equipment and storage medium for diagnosing flow of an EGR system. The method comprises: obtaining a component operating parameter of the vehicle that cooperates with the EGR system, and detecting whether the vehicle currently meets the fuel cut working condition of the flow diagnosis of the EGR system according to the component operating parameter; if it is detected that the vehicle currently meets the fuel cut working condition, a fuel cut identifier is connected to a parking interface of the vehicle to trigger the intake phase opening time to be adjusted according to the pulse table at the intake phase opening time; the EGR valve corresponding to the EGR system is controlled to be closed and opened; the fluctuation of the intake pressure of the intake pressure stabilizing cavity during the closing and opening of the EGR valve is obtained, and the flow diagnosis result of the EGR system is determined according to the fluctuation of the intake pressure. The embodiments of the present application can reduce the disturbance of the intake phase opening time change to the intake pressure, thereby facilitating the successful completion of the low flow diagnosis of the high-pressure EGR system.

Description

Technical Field

[0001] This application relates to the field of exhaust gas recirculation (EGR) systems for vehicles, and more specifically, to flow diagnosis methods, apparatus, equipment, and media for EGR systems. Background Technology

[0002] To meet increasingly stringent fuel consumption and emission regulations, various new engine-related technologies are being used more and more, among which exhaust gas recirculation technology is an effective measure to reduce fuel consumption and emissions.

[0003] Whether the EGR system can work properly and whether the corresponding faults can be diagnosed in a timely manner are prerequisites for energy conservation and emission reduction. Among them, the presence or absence of EGR low flow faults is one of the key indicators for judging whether the EGR system can work properly. Currently, the low flow diagnosis of high-pressure EGR systems includes comparing the intake pressure fluctuation of the intake pressure regulating chamber before and after the EGR valve is opened to identify EGR low flow faults. However, the intake pressure fluctuation is disturbed by the change in the timing of intake phase opening, which makes it impossible to diagnose low flow faults in high-pressure EGR systems. Summary of the Invention

[0004] To address the aforementioned technical problems, embodiments of this application provide a flow diagnosis method and apparatus for an EGR system, an electronic device, a computer-readable storage medium, and a computer program product, which can reduce the disturbance of intake pressure caused by changes in the intake phase opening time, thereby facilitating the successful completion of low flow diagnosis in a high-pressure EGR system.

[0005] According to one aspect of the embodiments of this application, a flow diagnosis method for an EGR system is provided, comprising: acquiring operating parameters of components in a vehicle that work in conjunction with the EGR system, and detecting whether the vehicle currently meets the fuel cut-off condition for flow diagnosis of the EGR system based on the component operating parameters; if the vehicle currently meets the fuel cut-off condition, connecting a fuel cut-off indicator to the vehicle's parking interface to trigger adjustment of the intake phase opening time based on a lookup table of the parking intake phase opening time pulse spectrum; controlling the EGR valve corresponding to the EGR system to close and open; acquiring the fluctuation amount of the intake pressure corresponding to the intake pressure regulating chamber during the closing and opening of the EGR valve, and determining the flow diagnosis result of the EGR system based on the fluctuation amount of the intake pressure.

[0006] According to one aspect of the present application, detecting whether the vehicle currently meets the fuel cut-off condition for flow diagnosis of the EGR system based on the component operating parameters includes: detecting whether the EGR valve meets the enabling condition based on the engine operating parameters and intake pressure regulating chamber parameters in the component operating parameters; detecting whether the engine meets the fuel cut-off condition based on the target operating parameters related to the fuel cut-off requirement in the component operating parameters; if the EGR valve meets the enabling condition and the engine meets the fuel cut-off condition, then controlling the engine to perform a fuel cut-off operation to determine that the vehicle currently meets the fuel cut-off condition.

[0007] According to one aspect of the embodiments of this application, the step of detecting whether the engine meets the fuel cut-off condition based on the target operating parameters related to the fuel cut-off requirement among the component operating parameters includes: determining a first target operating parameter related to the fuel cut-off requirement based on the gasoline particulate filter (GPF) inlet temperature or carbon load of the vehicle; determining a second target operating parameter related to the fuel cut-off requirement based on the diagnostic parameters of the vehicle's front oxygen sensor; and detecting whether the engine meets the fuel cut-off condition based on the first target operating parameter, the second target operating parameter, and the driver's power requirements for the engine.

[0008] According to one aspect of the present application, connecting the fuel cut-off indicator to the parking interface of the vehicle includes: acquiring the phase adjustment parameters of the electric intake phase adjustment system of the vehicle, and the engine speed during the fuel cut-off period; if it is determined that the engine speed is greater than a preset speed threshold, and it is determined that the electric intake phase adjustment system is operating normally according to the phase adjustment parameters, connecting the fuel cut-off indicator to the parking interface of the vehicle.

[0009] According to one aspect of this application, the step of obtaining the fluctuation of the intake pressure corresponding to the intake pressure regulating chamber during the closing and opening of the EGR valve, and determining the flow diagnosis result of the EGR system based on the fluctuation of the intake pressure, includes: obtaining a first intake pressure value corresponding to the intake pressure regulating chamber after the EGR valve is closed to a first preset angle; obtaining a second intake pressure value corresponding to the intake pressure regulating chamber when the EGR valve is opened to a second preset angle; calculating the fluctuation of the intake pressure based on the first and second intake pressure values, and determining a fluctuation threshold based on the vehicle model and the current engine speed; if the fluctuation of the intake pressure is less than the fluctuation threshold, then determining that the flow diagnosis result of the EGR system is a low flow fault.

[0010] According to one aspect of the embodiments of this application, the step of connecting the fuel cut-off indicator to the parking interface of the vehicle to trigger the adjustment of the intake phase opening time according to the parking intake phase opening time pulse spectrum lookup table includes: connecting the fuel cut-off indicator to the parking interface, performing a logical OR operation between the fuel cut-off indicator and the parking indicator to obtain a parking interface signal; if the parking interface signal is true, adjusting the intake phase opening time according to the parking intake phase opening time pulse spectrum lookup table, so that the difference between the intake phase opening time before and after the fuel cut-off of the vehicle's engine is less than a preset difference threshold.

[0011] According to one aspect of the embodiments of this application, adjusting the intake phase opening time according to the parking intake phase opening time pulse spectrum includes: obtaining the engine operating condition corresponding to the engine before the fuel cut-off; if the engine operating condition is a preset hot engine load condition, adjusting the intake phase opening time according to the parking intake phase opening time pulse spectrum to a preset lower limit range of the latest time, wherein the intake phase opening time corresponding to the hot engine load condition is the latest time.

[0012] According to one aspect of the embodiments of this application, a flow diagnosis device for an EGR system is provided, comprising: a detection module, configured to acquire operating parameters of components in a vehicle that work in conjunction with the EGR system, and detect whether the vehicle currently meets the fuel cut-off condition for flow diagnosis of the EGR system based on the component operating parameters; an adjustment module, configured to, if the vehicle is detected to currently meet the fuel cut-off condition, connect a fuel cut-off indicator to the vehicle's parking interface to trigger adjustment of the intake phase opening time based on a lookup table of the parking intake phase opening time pulse spectrum; a control module, configured to control the closing and opening of the EGR valve corresponding to the EGR system; and a determination module, configured to acquire the fluctuation amount of the intake pressure corresponding to the intake pressure regulating chamber during the closing and opening of the EGR valve, and determine the flow diagnosis result of the EGR system based on the fluctuation amount of the intake pressure.

[0013] According to one aspect of the embodiments of this application, an electronic device is provided, including: one or more processors; and a storage device for storing one or more programs, which, when executed by the one or more processors, cause the electronic device to implement the traffic diagnosis method of the EGR system as described above.

[0014] According to one aspect of the embodiments of this application, a computer-readable storage medium is provided, on which computer-readable instructions are stored, which, when executed by a computer's processor, cause the computer to perform the flow diagnosis method of the EGR system as described above.

[0015] According to one aspect of the embodiments of this application, a computer program product is also provided, including a computer program that, when executed by a processor, implements the steps in the flow diagnosis method of the EGR system as described above.

[0016] In the technical solution provided in the embodiments of this application, the operating parameters of the components that work in conjunction with the EGR system in the vehicle are obtained, and the vehicle is detected to meet the fuel cut-off condition for flow diagnosis of the EGR system based on the component operating parameters. This ensures the accuracy of the fuel cut-off condition detection. When the vehicle is detected to meet the fuel cut-off condition, the fuel cut-off indicator is connected to the vehicle's parking interface to trigger the adjustment of the intake phase opening time based on the pulse spectrum lookup table of the parking intake phase opening time. This reduces the change in the intake phase opening time before, during, and after fuel cut-off, thereby reducing intake pressure fluctuations and minimizing the disturbance of intake pressure caused by changes in the intake phase opening time. This promotes the smooth completion of low flow diagnosis of the high-pressure EGR system. Therefore, by obtaining the fluctuation of the intake pressure corresponding to the intake pressure stabilizing chamber during the closing and opening of the EGR valve, and determining the flow diagnosis result of the EGR system based on the fluctuation of the intake pressure, the accuracy and reliability of the flow diagnosis result can be guaranteed.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0019] Figure 1 This is a schematic diagram illustrating an implementation environment for performing flow diagnosis of an EGR system, as shown in an exemplary embodiment of this application.

[0020] Figure 2 This is a flowchart illustrating a flow diagnosis method for an EGR system, as shown in an exemplary embodiment of this application;

[0021] Figure 3 yes Figure 2 A schematic diagram illustrating the specific implementation flow of step S210 in an exemplary embodiment;

[0022] Figure 4 yes Figure 3 A schematic diagram illustrating the specific implementation flow of step S320 in an exemplary embodiment;

[0023] Figure 5yes Figure 2 A schematic diagram illustrating the specific implementation flow of step S220 in an exemplary embodiment;

[0024] Figure 6 yes Figure 2 A schematic diagram illustrating the specific implementation flow of step S240 in an exemplary embodiment;

[0025] Figure 7 This is a schematic diagram illustrating the process of opening the EGR valve in an exemplary embodiment of this application;

[0026] Figure 8 This is a schematic diagram illustrating the process of satisfying the fuel cut-off condition as shown in an exemplary embodiment of this application;

[0027] Figure 9 This is a flowchart illustrating intake pressure fluctuations as shown in an exemplary embodiment of this application;

[0028] Figure 10 This is a flowchart illustrating another flow diagnosis method for an EGR system according to an exemplary embodiment of this application;

[0029] Figure 11 This is a block diagram illustrating a flow diagnostic device for an EGR system, as shown in an exemplary embodiment of this application;

[0030] Figure 12 A schematic diagram of the structure of a computer system suitable for implementing the electronic device of the present application is shown. Detailed Implementation

[0031] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0032] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0033] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0034] In this application, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0035] In related technologies, during the engine fuel cut-off period, the large change in the intake phase opening time causes disturbance to the intake pressure, which may cause the low flow fault of the high-pressure EGR system to be undiagnosed or the engine control system to exit the diagnosis because it does not meet the low flow diagnosis conditions of the high-pressure EGR system.

[0036] The problems mentioned above are universally applicable in common scenarios. To address these issues, embodiments of this application propose a flow diagnosis method for an EGR system, which avoids significant fluctuations in the intake phase opening time before, during, and after fuel cut-off, and reduces intake pressure fluctuations caused by non-EGR opening reasons during high-pressure EGR low flow diagnosis, thus providing favorable preconditions for high-pressure EGR low flow diagnosis. These embodiments will be described in detail below.

[0037] Figure 1 This is a schematic diagram of an implementation environment for flow diagnosis of an EGR system, as illustrated in an exemplary embodiment of this application. The implementation environment includes a vehicle, which includes an engine control system 110, an engine 120, and a high-pressure EGR system 130. The EGR system 130 controls the amount of exhaust gas recirculated via an EGR valve.

[0038] The engine control system 110 is used to acquire the operating parameters of components that work in conjunction with the EGR system in the vehicle, and to detect whether the vehicle currently meets the fuel cut-off conditions for the EGR system's flow diagnosis based on the component operating parameters. If the vehicle currently meets the fuel cut-off conditions, the fuel cut-off indicator is connected to the vehicle's parking interface to trigger the adjustment of the intake phase opening time based on the pulse spectrum lookup table of the parking intake phase opening time. Then, the EGR valve corresponding to the EGR system is controlled to close and open. The fluctuation of the intake pressure corresponding to the intake pressure regulating chamber is acquired during the closing and opening of the EGR valve, and finally, the flow diagnosis result of the EGR system is determined based on the fluctuation of the intake pressure.

[0039] Please see Figure 2 , Figure 2 This is a flowchart illustrating a flow diagnosis method for an EGR system, as shown in an exemplary embodiment of this application. This method can be applied to... Figure 1The implementation environment shown is specifically executed by the engine control system in that implementation environment. It should be understood that the method can also be applied to other exemplary implementation environments and specifically executed by devices in other implementation environments. This embodiment does not limit the implementation environment to which the method is applicable.

[0040] like Figure 2 As shown, in an exemplary embodiment, the traffic diagnosis method for an EGR system includes at least steps S210 to S240, which are described in detail below:

[0041] S210. Obtain the operating parameters of the components in the vehicle that work in conjunction with the EGR system, and detect whether the vehicle currently meets the fuel cut-off conditions for the flow diagnosis of the EGR system based on the component operating parameters.

[0042] In the embodiments of this application, the part that works in conjunction with the EGR system refers to the component that works in conjunction with the EGR system and affects the flow diagnosis of the EGR system, such as the engine and the EGR valve. The component's operating parameters can reflect the component's operating status. For example, if the component that works in conjunction with the EGR system is the engine, the corresponding operating parameters are engine speed, engine coolant temperature, etc.

[0043] Since the operating parameters of components that work in conjunction with the EGR system can reflect the operating status of the components, and the operating status of the components can determine whether the components affect the EGR system's flow diagnosis, and whether the EGR system's flow diagnosis will affect the operation of the components.

[0044] It should be understood that EGR system flow diagnosis needs to be performed under engine fuel cut-off conditions. Therefore, if the operation parameters of the components are detected to be independent of each other and the operation of the EGR system flow diagnosis is determined, and the engine fuel cut-off conditions are met, it means that the vehicle currently meets the fuel cut-off conditions for EGR system flow diagnosis.

[0045] S220. If the vehicle is detected to be currently meeting the fuel cut-off condition, the fuel cut-off indicator is connected to the vehicle's parking interface to trigger the adjustment of the intake phase opening time based on the pulse spectrum lookup of the parking intake phase opening time.

[0046] In this embodiment, the fuel cut-off indicator refers to whether the engine has cut off the fuel supply, i.e., whether the fuel injectors have stopped injecting fuel. When the engine fuel cut-off indicator is 1, it indicates that the engine is in a fuel cut-off state; when it is 0, it indicates that the engine is in a fuel supply state. The purpose of the engine fuel cut-off indicator is to achieve fuel saving and emission control under certain specific conditions. For example, when going downhill at high speed or decelerating, if the engine speed is higher than a set threshold and the accelerator pedal is fully released, it will be determined as a fuel cut-off condition, and the engine fuel cut-off indicator will be set to 1, thereby cutting off the fuel supply and allowing the vehicle to coast by inertia.

[0047] The parking interface is used to monitor or control the engine status; the intake phase opening moment refers to the moment when the intake valve begins to open, which determines the length of the intake stroke and the amount of intake air. The intake phase opening moment can be adjusted by an electric intake phase adjustment system to adapt to different operating conditions. The parking intake phase opening moment pulse spectrum is a table of preset values ​​for the intake phase opening moment of the engine under different parking conditions. This table includes intake phase opening moment values ​​for various parking conditions to ensure accurate control of the intake phase under different conditions.

[0048] It should be noted that in related technologies, there are two different operating conditions before and after engine fuel cut-off: one is the warm-up low-load operating condition, i.e., when the engine speed is low and the load is light; the other is the fuel cut-off operating condition, i.e., when the engine speed is high and the load is zero. The intake phase difference between these two operating conditions is large, so a large change in intake phase will occur during the switch, which will cause the EGR system to misjudge or exit the diagnosis. However, in the embodiment of this application, the fuel cut-off indicator is connected to the vehicle's parking interface to trigger the adjustment of the intake phase opening time according to the pulse spectrum lookup table based on the parking intake phase opening time, instead of the intake phase opening time of the fuel cut-off operating condition in related technologies, so as to reduce the large change in the intake phase opening time before and after engine fuel cut-off.

[0049] S230, Controls the opening and closing of the EGR valve corresponding to the EGR system.

[0050] S240. Obtain the fluctuation of the intake pressure in the intake stabilizing chamber during the closing and opening of the EGR valve, and determine the flow diagnosis result of the EGR system based on the fluctuation of the intake pressure.

[0051] In this embodiment, after the engine fuel is cut off, the large change in the intake phase opening time before and after the engine fuel is cut off is reduced by adjusting the intake phase opening time, thereby eliminating the disturbance of the intake pressure caused by the change in the intake phase opening time. Then, the EGR valve corresponding to the EGR system is controlled to close and open. The fluctuation of the intake pressure in the intake pressure regulating chamber caused by the closure and opening of the EGR valve can be used to reflect the change in intake pressure, thereby determining the flow diagnosis result of the EGR system.

[0052] If the intake pressure changes very little during the opening and closing of the EGR valve, it indicates a low-flow fault in the EGR system. A low-flow fault means that the EGR valve or EGR pipeline is blocked, resulting in insufficient exhaust gas recirculation and an inability to effectively reduce nitrogen oxide emissions. If the intake pressure changes significantly, it indicates that the EGR system is normal.

[0053] In one example, during engine fuel cut-off, the air quality in the intake manifold remains constant. If the EGR system is functioning correctly, the air pressure in the intake manifold will decrease when the EGR valve is closed because exhaust gas cannot enter; when the EGR valve is open, the air pressure in the intake manifold will increase because exhaust gas enters. If the intake pressure changes very little during the opening and closing of the EGR valve, and exhaust gas can hardly enter, it indicates a low-flow fault in the EGR system. If the intake pressure changes significantly, it indicates that the EGR system is functioning correctly.

[0054] In this embodiment, the operating parameters of components that work in conjunction with the EGR system in the vehicle are acquired, and the vehicle is tested to determine whether it currently meets the fuel cut-off conditions for flow diagnosis of the EGR system based on the component operating parameters. This ensures the accuracy of the fuel cut-off condition detection. When the vehicle is detected to currently meet the fuel cut-off conditions, the fuel cut-off indicator is connected to the vehicle's parking interface to trigger the adjustment of the intake phase opening time based on the pulse spectrum lookup table of the parking intake phase opening time. This reduces the change in the intake phase opening time before, during, and after fuel cut-off, thereby reducing intake pressure fluctuations and minimizing the disturbance of intake pressure caused by changes in the intake phase opening time. This promotes the smooth completion of low flow diagnosis of the high-pressure EGR system. Therefore, by acquiring the fluctuation of the intake pressure corresponding to the intake pressure regulating chamber during the closing and opening of the EGR valve, and determining the flow diagnosis result of the EGR system based on the fluctuation of the intake pressure, the accuracy and reliability of the flow diagnosis result can be guaranteed.

[0055] Furthermore, based on the above embodiments, please refer to... Figure 3 In one exemplary embodiment provided in this application, step S210, which involves detecting whether the vehicle currently meets the fuel cut-off condition for the EGR system's flow diagnosis, specifically includes steps S310 to S330, which are detailed below:

[0056] S310. Detect whether the EGR valve meets the enabling conditions based on the engine operating parameters and intake manifold parameters in the component operating parameters.

[0057] In this embodiment, the components that work in conjunction with the EGR system include the engine and the intake pressure regulating chamber. The engine operating parameters can reflect the engine's operating status, and the intake manifold parameters include parameters related to the EGR enabling conditions.

[0058] In one example, if the engine operating parameters meet the corresponding parameter thresholds and the intake manifold parameters meet the corresponding parameters, then the EGR valve is determined to meet the enabling conditions, meaning that the EGR valve can be opened.

[0059] For example, engine operating parameters include engine speed and the corresponding coolant temperature; intake manifold parameters include intake air temperature. When the engine speed is greater than 700 rpm, the engine operating status is in normal mode; when the engine runs until the coolant temperature is greater than the set value, reaching 70 degrees Celsius, the engine is warmed up. If the coolant temperature is too low, the engine combustion is poor, and activating EGR may lead to poor combustion or even misfire. Therefore, EGR should not be activated at low coolant temperatures; if the intake air temperature is greater than the set value, such as 2 degrees Celsius, to prevent EGR from condensing and freezing at low temperatures, the EGR valve is detected to meet the enabling conditions.

[0060] S320: Detect whether the engine meets the fuel cut-off conditions based on the target operating parameters related to fuel cut-off requirements in the component operating parameters.

[0061] As described earlier, EGR system diagnostics require engine fuel cut-off. Therefore, it's necessary to extract target operating parameters related to the fuel cut-off requirement from component operating parameters, and then use these target operating parameters to detect whether the engine meets the fuel cut-off conditions. The fuel cut-off requirement includes the fuel cut-off requirement of a specific vehicle component itself, and can also include the fuel cut-off requirement of relevant personnel for a specific component. When the target operating parameters related to the fuel cut-off requirement meet the corresponding conditions, it is determined that the engine meets the fuel cut-off conditions.

[0062] Furthermore, based on the above embodiments, please refer to... Figure 4 In one exemplary embodiment provided in this application, the specific implementation process for detecting whether the engine meets the fuel cut-off condition includes steps S410 and S430, which are described in detail below:

[0063] S410. Determine the first target operating parameters related to fuel cut-off requirements based on the vehicle's gasoline particulate filter (GPF) inlet temperature or carbon load.

[0064] GPF stands for Gasoline Particulate Filter, a ceramic filter installed in the emission system of a gasoline engine. Its main function is to capture particulate matter before it enters the atmosphere, reducing particulate matter. Before cutting off the engine fuel supply, the GPF inlet temperature or carbon load is measured. If the GPF inlet temperature exceeds a preset temperature threshold or the carbon load exceeds a preset load threshold, a large amount of fresh air will enter the hot GPF carrier when the engine fuel is cut off. The carbon particles will burn rapidly and instantly, generating a large amount of heat that exceeds the GPF carrier's own temperature tolerance, causing irreversible damage to the GPF carrier. Therefore, if the GPF inlet temperature is too high or the carbon load is too high, the first target operating parameter related to the fuel cut-off requirement is determined as the operating parameter used to indicate that fuel cut-off should not be prohibited.

[0065] In one example, when the GPF inlet temperature is too high and the carbon load is too high, the first target operating parameter is determined as the operating parameter used to indicate that fuel cut-off is prohibited.

[0066] S420. Determine the second target operating parameters related to fuel cut-off requirements based on the diagnostic parameters of the vehicle's front oxygen sensor.

[0067] The function of the front oxygen sensor is to check the oxygen content in the exhaust gas after engine combustion. The diagnosis of the front oxygen sensor itself is to determine whether the front oxygen sensor is aging by enriching or leaning the air-fuel ratio in the engine control system and detecting changes in the air-fuel ratio. However, the engine fuel cut-off will cause a momentary change in the air-fuel ratio, similar to the extreme leaning operation of the engine control system, thus interfering with the diagnosis of the front oxygen sensor. Therefore, if the diagnostic parameters of the front oxygen sensor are used to indicate that the front oxygen sensor is performing a diagnosis, then the second target operating parameter related to the fuel cut-off requirement is determined to be the operating parameter used to indicate that fuel cut-off is prohibited.

[0068] S430: Detect whether the engine meets the fuel cut-off condition based on the first target operating parameters, the second target operating parameters, and the driver's power requirements for the engine.

[0069] In this embodiment, the driver's demand for engine power refers to whether the driver needs the engine to provide power to accelerate the vehicle. This demand can be determined based on the opening of the accelerator pedal. For example, if the opening of the accelerator pedal is greater than a preset threshold, it indicates that the driver has a demand for engine power. The demand can also be determined based on a combination of engine speed and accelerator pedal position. If the engine speed is higher than a set threshold and the accelerator pedal is fully released, it indicates that the driver has no demand for engine power. Furthermore, the demand can be determined based on the driver's driving commands. For example, if the driving command is a cruise control command, it indicates a demand for power. Cruise control refers to automatically maintaining the vehicle speed at a fixed speed after the driver activates the switch at the desired speed without needing to press the accelerator pedal. Finally, the demand can be determined based on the driver's driving habits. For example, if the driver's driving habit is not to accelerate when going downhill at high speed or decelerating, it indicates no demand for power.

[0070] In one example, when both the first target operating parameter and the second target operating parameter indicate that there is no prohibition on fuel cut-off and the driver has no power demand, the detection determines that the engine meets the fuel cut-off condition.

[0071] In this embodiment, the engine meets the fuel cut-off conditions from three aspects: GPF, front oxygen sensor, and driver's power requirements. This ensures the accuracy and comprehensiveness of the detection and avoids the fuel cut-off affecting the operation of other related components.

[0072] S330. If the EGR valve meets the enabling condition and the engine meets the fuel cut-off condition, then control the engine to perform a fuel cut-off operation to determine if the vehicle currently meets the fuel cut-off condition.

[0073] In this embodiment, if the EGR valve meets the enabling condition and the engine meets the fuel cut-off condition, it means that the engine can cut off fuel and the EGR valve can be opened. At this time, the engine is controlled to perform the fuel cut-off operation, which means that the vehicle currently meets the fuel cut-off condition and the subsequent flow diagnosis process of the EGR system can be executed.

[0074] In this embodiment, the engine is controlled to perform a fuel cut-off operation by checking whether the EGR valve meets the enabling conditions and whether the engine meets the fuel cut-off conditions, thereby determining whether the vehicle currently meets the fuel cut-off conditions and providing a reliable environment for subsequent flow diagnosis.

[0075] Furthermore, based on the above embodiments, in one exemplary embodiment provided in this application, connecting the fuel cut-off indicator to the vehicle's parking interface includes the following steps, detailed below:

[0076] Obtain the phase adjustment parameters of the vehicle's electric intake phase adjustment system and the engine speed during the engine fuel cut-off period. If it is determined that the engine speed is greater than the preset speed threshold and the electric intake phase adjustment system is operating normally according to the phase adjustment parameters, connect the fuel cut-off indicator to the vehicle's parking interface.

[0077] The electric intake phase adjustment system is used to adjust the intake phase opening time. The phase adjustment parameter is used to reflect the operation of the electric intake phase adjustment system. If the electric intake phase adjustment system is determined to be operating normally according to the phase adjustment parameter, it means that the electric intake phase adjustment system has no faults related to the inability to operate the intake phase. That is, the electric intake phase adjustment system itself has no hardware problems or wiring harness problems and can respond to the intake phase operation requirements of the engine control system.

[0078] During the engine fuel cut-off period, the engine speed is higher than the preset speed threshold. This is to avoid the problem of unstable motor speed control of the electric phase adjustment system at low speeds, which would lead to a decrease in phase control accuracy. The preset speed threshold can be flexibly adjusted according to actual needs, such as 280 to 300 rpm.

[0079] Therefore, when the engine speed is greater than the preset speed threshold and the electric intake phase adjustment system is operating normally, the fuel cut-off indicator is connected to the vehicle's parking interface to trigger the electric intake phase adjustment system to adjust the intake phase opening time based on the pulse spectrum lookup table of the parking intake phase opening time.

[0080] Furthermore, based on the above embodiments, please refer to... Figure 5In one exemplary embodiment provided in this application, the specific implementation process of connecting the fuel cut-off indicator to the vehicle's parking interface to trigger the adjustment of the intake phase opening time based on the parking intake phase opening time pulse spectrum lookup table includes steps S510 and S520, which are described in detail below:

[0081] Step S510: Connect the fuel cut-off indicator to the parking interface, and perform a logical OR operation between the fuel cut-off indicator and the parking indicator to obtain the parking interface signal.

[0082] Step S520: If the parking interface signal is true, adjust the intake phase opening time according to the parking intake phase opening time pulse spectrum to make the difference between the intake phase opening time before and after engine fuel cut-off less than a preset difference threshold.

[0083] In this embodiment, the parking indicator is used to indicate whether the engine is in a parking state. Typically, the parking indicator is activated when the driver puts the vehicle into parking mode. The fuel cut-off indicator is connected to the parking interface and logically ORed with the parking indicator to obtain a comprehensive parking interface signal.

[0084] When the parking interface signal is true, it can be either the fuel cut-off indicator or the parking indicator, or both. In this case, the intake phase opening time needs to be adjusted according to the parking intake phase opening time pulse spectrum to obtain the corresponding intake phase opening time, and the intake valve is controlled to open at that time. It is worth noting that when adjusting the intake phase opening time, i.e., obtaining the intake phase opening time after engine fuel cut-off, the difference between the intake phase opening time before and after engine fuel cut-off must be less than a preset difference threshold. For example, if the intake phase opening time before engine fuel cut-off is A, and the adjusted intake phase opening time is B, then AB is less than the preset difference threshold. This preset difference threshold can be flexibly adjusted according to the actual situation.

[0085] When the overall parking interface signal is false, this will adjust the intake phase opening time according to the actual operating conditions and control the intake valve to open at that time.

[0086] In this embodiment, the fuel cut-off indicator is introduced into the parking interface and logically ORed with the parking indicator to enable the intake phase opening time to be looked up according to the pulse spectrum of the parking intake phase opening time, which effectively reduces the change of the intake phase opening time before, during and after the fuel cut-off, thereby reducing intake pressure fluctuations.

[0087] Furthermore, in this embodiment, adjusting the intake phase opening time according to the parking intake phase opening time pulse spectrum lookup table includes:

[0088] Obtain the engine operating condition before the engine fuel cut-off; if the engine operating condition is the preset hot engine load condition, adjust the intake phase opening time to the preset lower limit range of the latest time according to the parking intake phase opening time pulse spectrum, wherein the intake phase opening time corresponding to the hot engine load condition is the latest time.

[0089] In this embodiment, the preset hot engine load condition refers to the operating condition when the engine speed is low and the load is light. Under the hot engine load condition, in order to save fuel consumption and ensure combustion stability, the intake phase opening time is the latest opening time, that is, the intake valve opens only when the piston is close to top dead center. Therefore, when the engine operating condition before fuel cut-off is obtained and the engine operating condition is determined to be the preset hot engine load condition, the intake phase opening time is adjusted to the preset lower limit range of the latest time according to the parking intake phase opening time pulse spectrum, that is, adjusted to be near the latest time. This preset lower limit range can be determined according to the aforementioned preset difference threshold. Since the parking intake phase opening time is the latest time, the intake phase opening time before fuel cut-off is also near the latest time, thus avoiding large movements of the intake phase opening time before, during and after fuel cut-off that cause intake pressure fluctuations.

[0090] In other embodiments of this application, if the engine operating condition is not the preset hot engine load condition, but other load conditions, the intake phase opening time is adjusted to be near the intake phase opening time corresponding to the other load conditions.

[0091] Furthermore, based on the above embodiments, please refer to... Figure 6 In one exemplary embodiment provided in this application, the specific implementation process for determining the traffic diagnostic results of the EGR system includes steps S610 and S640, which are described in detail below:

[0092] S610. Obtain the first intake pressure value corresponding to the intake pressure regulating chamber after the EGR valve is closed to the first preset angle.

[0093] S620: Obtain the second intake pressure value corresponding to the intake pressure regulating chamber when the EGR valve is opened to the second preset angle.

[0094] S630: Calculate the fluctuation amount of intake pressure based on the first intake pressure value and the second intake pressure value, and determine the fluctuation amount threshold based on the vehicle model and the current engine speed.

[0095] S640. If the fluctuation of the intake pressure is less than the fluctuation threshold, the flow diagnosis result of the EGR system is determined to be a low flow fault.

[0096] In this embodiment of the application, after adjusting the intake phase opening time, the engine control system controls the EGR valve to close to the first preset angle and records the first intake pressure value corresponding to the intake pressure regulating chamber; then controls the EGR valve to open to the second preset angle and records the second intake pressure value corresponding to the intake pressure regulating chamber; wherein, the first preset angle and the second preset angle can be flexibly adjusted according to actual needs, such as the first preset angle being about 5 degrees and the second preset angle being more than 70 degrees.

[0097] The absolute value of the difference between the first intake pressure value and the second intake pressure value is taken as the fluctuation of the intake pressure.

[0098] It should be noted that in this embodiment, the fluctuation threshold is determined based on the vehicle model and the current engine speed. For example, firstly, data related to the vehicle model and engine speed needs to be collected. This data may include tests conducted in a laboratory or on the road to obtain information on the intake pressure fluctuation at different vehicle models and engine speeds. Using the collected data, a mathematical model is established to correlate the intake pressure fluctuation with the vehicle model and engine speed; this model can be linear or non-linear, depending on the nature of the data. Using the model, calibration is performed to determine an appropriate threshold, i.e., testing the normal operation of the high-pressure EGR system at different vehicle models and engine speeds. Then, based on these test data, the intake pressure fluctuation threshold is set so that the system can accurately detect low-flow faults.

[0099] For example, the optimal EGR rate under different operating conditions (speed, load, etc.) is determined based on engine bench performance calibration for different vehicle models. Using the optimal EGR rate and other parameters (such as intake and exhaust temperatures) based on the EGR flow model, the intake pressure fluctuation during EGR valve closure and opening is calculated. This intake pressure fluctuation under different operating conditions is used as a set threshold and stored in memory for later use. Then, after obtaining the current vehicle model, the engine speed and load are determined based on signals from the crankshaft position sensor, throttle position sensor, and coolant temperature sensor. The corresponding fluctuation threshold is then retrieved from a table in memory.

[0100] In this embodiment of the application, the fluctuation of the intake pressure is compared with a determined fluctuation threshold. If the fluctuation of the intake pressure is less than the fluctuation threshold, the flow diagnosis result of the EGR system is determined to be a low flow fault; if the fluctuation of the intake pressure is greater than or equal to the fluctuation threshold, the flow diagnosis result of the EGR system is determined to be no low flow fault.

[0101] In this embodiment, the fluctuation threshold is determined based on the vehicle model and the current engine speed to ensure that the fluctuation threshold is applicable to various vehicles and operating conditions. This ensures the reliability of flow diagnosis when comparing the fluctuation of intake pressure with the fluctuation threshold.

[0102] For ease of understanding, taking an Atkinson cycle engine as an example, the flow diagnosis method of the EGR system provided in this application embodiment will be described in detail:

[0103] This method includes: acquiring engine operating status, engine coolant temperature, and intake air temperature; the engine control system determines whether the high-pressure EGR opening conditions are met; acquiring information such as no GPF fuel cut-off requirement, no need for pre-oxygen sensor diagnostics, and no driver power requirement; the engine control system determines whether fuel cut-off is permitted; acquiring information such as whether the intake phase adjustment system has a fault and engine speed; and determining whether the intake phase adjustment system can work normally. After the above conditions are met, at the start of EGR low-flow diagnosis, the fuel cut-off indicator is introduced into the parking interface using the function interface of the engine control system software. A logical OR relationship is then established with the parking indicator to achieve the intake phase opening time based on the parking intake phase opening time pulse spectrum. By utilizing the small difference between the parking intake phase opening time and the intake phase opening time under low load on a hot engine, the difference in intake phase opening time before and after fuel cut-off is minimized, thereby reducing the disturbance of intake pressure caused by changes in intake phase opening time, promoting the smooth completion of low-flow diagnosis of the high-pressure EGR system, and improving the success rate of low-flow diagnosis of the high-pressure EGR system in Atkinson cycle engines equipped with an electric intake phase adjustment system.

[0104] like Figure 7 As shown, when the engine is running normally, and the engine coolant temperature and intake air temperature are both above the set values, the EGR valve opening conditions are considered met. Specifically, the engine speed must be above 700 rpm for the engine to be in normal operating mode. When the engine coolant temperature reaches 70 degrees Celsius, the engine is warmed up. If the coolant temperature is too low, combustion is poor, and opening the EGR valve may lead to further combustion problems or even misfire. Therefore, the EGR valve cannot be opened at low coolant temperatures. When the intake air temperature is above 2 degrees Celsius, the EGR valve needs to be open for low-flow diagnostics. The EGR valve does not open at low temperatures to prevent condensation and freezing.

[0105] like Figure 7 As shown, the fuel cut-off condition is determined to be met when the GPF allows fuel cut-off, the front oxygen sensor does not perform diagnostics, and the vehicle controller requests fuel cut-off. Specifically, the driver has no power requirement for the engine, and the vehicle controller requests fuel cut-off to prevent insufficient power due to fuel cut-off when the driver needs to overtake or accelerate.

[0106] exist Figure 7 and Figure 8 Based on this, the engine fuel is cut off. At this point, the fuel cut-off condition for the low flow diagnosis of the high-pressure EGR system is met, and the fuel cut-off will not affect the operation of other related components.

[0107] like Figure 9 As shown, before starting the EGR low flow diagnosis, it is also necessary to confirm that there are no related faults related to the electric intake phase adjustment system being unable to operate, so as to ensure that the intake phase can be adjusted subsequently; the engine speed must not be lower than the set value during the fuel cut-off period to improve the problem of deteriorated phase control accuracy.

[0108] When the EGR low flow diagnostic begins, the engine control system connects the fuel cut-off indicator to the parking interface. By utilizing the high priority strategy of the parking intake phase opening time pulse spectrum table set by the engine control system, the intake phase opening time at fuel cut-off is determined according to the parking intake phase opening time pulse spectrum. In other words, the fuel cut-off and idling intake phase opening times of the hybrid vehicle are decoupled, and the respective intake phase opening times are determined according to different pulse spectra. That is, the intake phase opening time at fuel cut-off is near the latest time, and the intake phase opening time at idling is at an intermediate time. Since the parking intake phase opening time is the latest time after the engine fuel cut-off, and the engine load is relatively small before fuel cut-off, its intake phase opening time is also near the latest time. Therefore, large movements of the intake phase opening time before, during and after fuel cut-off are avoided, which would cause intake pressure fluctuations.

[0109] like Figure 10 As shown, the engine control system controls the EGR valve to close and records the current intake pressure value 1; the engine control system controls the EGR valve to open and records the current intake pressure value 2; the engine control system detects that the absolute value of the difference between intake pressure values ​​1 and 2 during the EGR valve opening and closing period is less than the set threshold, which is generally around 80 hPa. If it is lower than the set value, it is determined to be a low flow fault; if it is greater than or equal to the threshold, it is determined that there is no low flow fault in the EGR system.

[0110] This application describes an apparatus embodiment that can be used to perform the traffic diagnosis method for the EGR system described in the above embodiments of this application. For details not disclosed in the apparatus embodiments of this application, please refer to the embodiments of the traffic diagnosis method for the EGR system described above.

[0111] Figure 11 This is a block diagram illustrating a flow diagnostic device for an EGR system, as shown in an exemplary embodiment of this application. This device can be applied to… Figure 1 The implementation environment shown is specifically configured in a vehicle. This device can also be applied to other exemplary implementation environments and specifically configured in other devices; this embodiment does not limit the implementation environment to which the device is applicable.

[0112] like Figure 11 As shown, the flow diagnostic device for this exemplary EGR system includes:

[0113] The detection module 1110 is used to acquire the operating parameters of the components in the vehicle that work in conjunction with the EGR system, and to detect whether the vehicle currently meets the fuel cut-off condition for the flow diagnosis of the EGR system based on the operating parameters of the components.

[0114] The adjustment module 1120 is used to connect the fuel cut-off indicator to the vehicle's parking interface if it is detected that the vehicle currently meets the fuel cut-off condition, so as to trigger the adjustment of the intake phase opening time according to the pulse spectrum lookup table of the parking intake phase opening time.

[0115] Control module 1130 is used to control the opening and closing of the EGR valve corresponding to the EGR system;

[0116] The determination module 1140 is used to acquire the fluctuation of the intake pressure corresponding to the intake pressure regulating chamber during the closing and opening of the EGR valve, and to determine the flow diagnosis result of the EGR system based on the fluctuation of the intake pressure.

[0117] In one embodiment provided in this application, the detection module 1110 is specifically used to detect whether the EGR valve meets the enabling condition based on the engine operating parameters and intake pressure regulating chamber parameters in the component operating parameters; to detect whether the engine meets the fuel cut-off condition based on the target operating parameters related to fuel cut-off requirements in the component operating parameters; and if the EGR valve meets the enabling condition and the engine meets the fuel cut-off condition, then the engine is controlled to perform a fuel cut-off operation to determine whether the vehicle currently meets the fuel cut-off condition.

[0118] According to one aspect of the embodiments of this application, the detection module 1110 is specifically configured to determine a first target operating parameter related to the fuel cut-off requirement based on the gasoline particulate filter (GPF) inlet temperature or carbon load of the vehicle; determine a second target operating parameter related to the fuel cut-off requirement based on the diagnostic parameters of the vehicle's front oxygen sensor; and detect whether the engine meets the fuel cut-off conditions based on the first target operating parameter, the second target operating parameter, and the driver's power requirements for the engine.

[0119] According to one aspect of the embodiments of this application, the adjustment module 1120 is specifically used to obtain the phase adjustment parameters of the electric intake phase adjustment system of the vehicle, and the engine speed during the engine fuel cut-off period; if it is determined that the engine speed is greater than a preset speed threshold, and it is determined that the electric intake phase adjustment system is operating normally according to the phase adjustment parameters, then the fuel cut-off indicator is connected to the parking interface of the vehicle.

[0120] According to one aspect of the embodiments of this application, the determining module 1140 is specifically used to obtain a first intake pressure value corresponding to the intake pressure regulating chamber after the EGR valve is closed to a first preset angle; obtain a second intake pressure value corresponding to the intake pressure regulating chamber when the EGR valve is opened to a second preset angle; calculate the fluctuation amount of the intake pressure based on the first intake pressure value and the second intake pressure value, and determine a fluctuation amount threshold based on the vehicle model and the current engine speed; if the fluctuation amount of the intake pressure is less than the fluctuation amount threshold, then determine that the flow diagnosis result of the EGR system is a low flow fault.

[0121] According to one aspect of the embodiments of this application, the adjustment module 1120 is specifically used to connect the fuel cut-off indicator quantity to the parking interface, so as to perform a logical OR operation on the fuel cut-off indicator quantity and the parking indicator quantity to obtain a parking interface signal; if the parking interface signal is true, the intake phase opening time is adjusted according to the parking intake phase opening time pulse spectrum lookup table, so that the difference between the intake phase opening time before and after the fuel cut-off of the vehicle's engine is less than a preset difference threshold.

[0122] According to one aspect of the embodiments of this application, the adjustment module 1120 is further specifically used to obtain the engine operating condition corresponding to the engine before the engine fuel cut-off; if the engine operating condition is a preset hot engine load operating condition, the intake phase opening time is adjusted to the latest time within the preset lower limit range according to the parking intake phase opening time pulse spectrum, wherein the intake phase opening time corresponding to the hot engine load operating condition is the latest time.

[0123] It should be noted that the EGR system flow diagnosis device and the EGR system flow diagnosis method provided in the above embodiments belong to the same concept. The specific way in which each module and unit performs operations has been described in detail in the method embodiments, and will not be repeated here.

[0124] In practical applications, the flow diagnostic device for the EGR system provided in the above embodiments can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above, and this is not a limitation.

[0125] Embodiments of this application also provide an electronic device, including: one or more processors; and a storage device for storing one or more programs, which, when executed by one or more processors, cause the electronic device to implement the flow diagnosis method of the EGR system provided in the above embodiments.

[0126] Figure 12A schematic diagram of a computer system suitable for implementing the embodiments of this application is shown. It should be noted that... Figure 12 The computer system 1200 of the electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application, wherein the electronic device may be configured in a vehicle.

[0127] like Figure 12 As shown, the computer system 1200 includes a Central Processing Unit (CPU) 1201, which can perform various appropriate actions and processes, such as executing the methods described in the above embodiments, based on programs stored in Read-Only Memory (ROM) 1202 or programs loaded from storage portion 1208 into Random Access Memory (RAM) 1203. The RAM 1203 also stores various programs and data required for system operation. The CPU 1201, ROM 1202, and RAM 1203 are interconnected via a bus 1204. An Input / Output (I / O) interface 1205 is also connected to the bus 1204.

[0128] The following components are connected to I / O interface 1205: an input section 1206 including a keyboard, mouse, etc.; an output section 1207 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 1208 including a hard disk, etc.; and a communication section 1209 including a network interface card such as a LAN (Local Area Network) card, modem, etc. The communication section 1209 performs communication processing via a network such as the Internet. A drive 1210 is also connected to I / O interface 1205 as needed. Removable media 1211, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., are installed on drive 1210 as needed so that computer programs read from them can be installed into storage section 1208 as needed.

[0129] Specifically, according to embodiments of this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program including a computer program for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 1209, and / or installed from removable medium 1211. When the computer program is executed by central processing unit (CPU) 1201, it performs various functions defined in the system of this application.

[0130] It should be noted that the computer-readable medium shown in the embodiments of this application can be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: 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), flash memory, optical fiber, portable compact disc read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this application, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, carrying a computer-readable computer program. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media can also be any computer-readable medium other than computer-readable storage media, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The computer program contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, etc., or any suitable combination thereof.

[0131] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. Each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0132] The units described in the embodiments of this application can be implemented in software or hardware, and the described units can also be located in a processor. The names of these units do not necessarily limit the specific unit itself.

[0133] Another aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the flow diagnosis method for the EGR system as described above. This computer-readable storage medium may be included in the electronic device described in the above embodiments, or it may exist independently and not incorporated into the electronic device.

[0134] Another aspect of this application provides a computer program product or computer program including computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the flow diagnosis method of the EGR system provided in the various embodiments described above.

[0135] The above description is merely a preferred exemplary embodiment of this application and is not intended to limit the implementation of this application. Those skilled in the art can easily make corresponding modifications or alterations based on the main concept and spirit of this application. Therefore, the scope of protection of this application should be determined by the scope of protection claimed in the claims.

Claims

1. A flow rate diagnosis method for an exhaust gas recirculation (EGR) system, characterized in that, include: Obtain the operating parameters of the components in the vehicle that work in conjunction with the EGR system, and detect whether the vehicle currently meets the fuel cut-off condition for flow diagnosis of the EGR system based on the operating parameters of the components; If it is detected that the vehicle currently meets the fuel cut-off condition, the fuel cut-off indicator is connected to the vehicle's parking interface to trigger the adjustment of the intake phase opening time according to the pulse spectrum lookup table of the parking intake phase opening time, so that the difference between the intake phase opening time before and after the engine fuel cut-off is less than a preset difference threshold. Controls the opening and closing of the EGR valve corresponding to the EGR system; The fluctuation of the intake pressure in the intake stabilizing chamber during the closing and opening of the EGR valve is obtained, and the flow rate diagnosis result of the EGR system is determined based on the fluctuation of the intake pressure.

2. The method according to claim 1, characterized in that, The step of detecting whether the vehicle currently meets the fuel cut-off condition for flow diagnosis of the EGR system based on the component operating parameters includes: The system detects whether the EGR valve meets the enabling conditions based on the engine operating parameters and intake pressure regulating chamber parameters in the component operating parameters. The engine is detected to meet the fuel cut-off conditions based on the target operating parameters related to fuel cut-off requirements in the component operating parameters. The target operating parameters include operating parameters for indicating that fuel cut-off is prohibited and operating parameters for indicating the driver's power requirements. The fuel cut-off conditions include conditions indicating that there is no prohibition on fuel cut-off and conditions indicating that the driver has no power requirements. If the EGR valve meets the enabling condition and the engine meets the fuel cut-off condition, then the engine is controlled to perform a fuel cut-off operation to determine whether the vehicle currently meets the fuel cut-off condition.

3. The method according to claim 2, characterized in that, The step of detecting whether the engine meets the fuel cut-off condition based on the target operating parameters related to the fuel cut-off requirement in the component operating parameters includes: The first target operating parameters related to the fuel cut-off requirement are determined based on the gasoline particulate filter (GPF) inlet temperature or carbon load of the vehicle. A second target operating parameter related to the fuel cut-off requirement is determined based on the diagnostic parameters of the vehicle's front oxygen sensor; The engine is tested to determine whether it meets the fuel cut-off condition based on the first target operating parameters, the second target operating parameters, and the driver's power requirements for the engine.

4. The method according to claim 2, characterized in that, The step of connecting the fuel cut-off indicator to the vehicle's parking interface includes: The phase adjustment parameters of the electric intake phase adjustment system of the vehicle, and the engine speed during the engine fuel cut-off period are obtained. If it is determined that the engine speed is greater than the preset speed threshold, and the electric intake phase adjustment system is determined to be operating normally according to the phase adjustment parameters, the fuel cut-off indicator is connected to the vehicle's parking interface.

5. The method according to claim 1, characterized in that, Acquire the fluctuation of the intake pressure in the intake regulating chamber during the closing and opening of the EGR valve, and determine the flow rate diagnostic result of the EGR system based on the fluctuation of the intake pressure, including: After the EGR valve is closed to the first preset angle, the first intake pressure value corresponding to the intake pressure regulating chamber is obtained; Obtain the second intake pressure value corresponding to the intake pressure regulating chamber when the EGR valve is opened to the second preset angle; The fluctuation of the intake pressure is calculated based on the first intake pressure value and the second intake pressure value, and the fluctuation threshold is determined based on the vehicle model and the current engine speed. If the fluctuation of the intake pressure is less than the fluctuation threshold, the flow diagnosis result of the EGR system is determined to be a low flow fault.

6. The method according to any one of claims 1 to 5, characterized in that, The step of connecting the fuel cut-off indicator to the vehicle's parking interface to trigger adjustment of the intake phase opening time based on a lookup table of the parking intake phase opening time pulse spectrum includes: Connect the fuel cut-off indicator to the parking interface, and perform a logical OR operation between the fuel cut-off indicator and the parking indicator to obtain the parking interface signal. If the parking interface signal is true, the intake phase opening time is adjusted according to the pulse spectrum of the parking intake phase opening time.

7. The method according to claim 6, characterized in that, The step of adjusting the intake phase opening time according to the parking intake phase opening time pulse spectrum includes: Obtain the engine operating conditions before the engine fuel cut-off; If the engine operating condition is a preset hot engine load condition, then the intake phase opening time is adjusted to the latest time within the preset lower limit range according to the parking intake phase opening time pulse spectrum, wherein the intake phase opening time corresponding to the hot engine load condition is the latest time.

8. A flow diagnosis device for an EGR system, characterized in that, include: The detection module is used to acquire the operating parameters of the components in the vehicle that work in conjunction with the EGR system, and to detect whether the vehicle currently meets the fuel cut-off condition for flow diagnosis of the EGR system based on the operating parameters of the components. The adjustment module is used to connect the fuel cut-off flag to the vehicle's parking interface if it is detected that the vehicle currently meets the fuel cut-off condition, so as to trigger the adjustment of the intake phase opening time according to the pulse spectrum of the parking intake phase opening time, so that the difference between the intake phase opening time before and after the engine fuel cut-off is less than a preset difference threshold. The control module is used to control the opening and closing of the EGR valve corresponding to the EGR system; The determination module is used to acquire the fluctuation of the intake pressure corresponding to the intake pressure regulating chamber during the closing and opening of the EGR valve, and to determine the flow diagnosis result of the EGR system based on the fluctuation of the intake pressure.

9. An electronic device, characterized in that, include: One or more processors; A storage device for storing one or more programs, which, when executed by the one or more processors, cause the electronic device to perform the method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, It stores computer-readable instructions that, when executed by the computer's processor, cause the computer to perform the method of any one of claims 1 to 7.

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