Exhaust brake valve sticking diagnosis method, device, equipment, storage medium and product

Abstract

The application discloses an exhaust brake valve sticking diagnosis method, device, equipment, storage medium and product. The method comprises the following steps: when it is detected that the vehicle engine is successfully started, the engine speed and the current vehicle working condition in a preset time period are acquired; if it is determined that the preset first exhaust brake valve sticking judgment condition is met according to the engine speed and the current vehicle working condition, the exhaust brake valve is controlled to enter an inspection state, and the opening and closing state of the exhaust brake valve is controlled in the inspection state, and the maximum fuel injection amount and the minimum fuel injection amount of the exhaust brake valve in the opening and closing state are detected; the fuel injection amount deviation is determined according to the maximum fuel injection amount and the minimum fuel injection amount; the sticking diagnosis result of the exhaust brake valve is determined according to the fuel injection amount deviation, and the vehicle control strategy is generated according to the sticking diagnosis result. The technical scheme of the embodiment of the application improves the sticking diagnosis reliability and accuracy of the exhaust brake valve.

Description

Technical Field

[0001] This invention relates to the field of automotive engine control technology, and in particular to a method, apparatus, equipment, storage medium, and product for diagnosing exhaust brake valve sticking. Background Technology

[0002] The exhaust brake valve is a dedicated auxiliary braking device for diesel vehicles, primarily used for vehicle deceleration control in complex road conditions such as mines, mountainous areas, and urban environments. It serves as a necessary supplement to the service brake, achieving braking force by blocking engine exhaust to create compression damping, and simultaneously cutting off fuel supply. If the exhaust brake valve becomes stuck, the vehicle will lose power, and exhaust pressure and temperature may become excessively high, posing a significant threat to both safety and vehicle reliability. Since the exhaust brake valve is typically pneumatically driven by a solenoid valve, sticking can occur at the solenoid valve itself or within the valve body. Neither case can be diagnosed through circuit analysis. A common diagnostic method is to add a pressure sensor upstream of the valve body. When sticking occurs, the upstream pressure will become abnormal, either abnormally high or abnormally low. However, adding a pressure sensor increases costs.

[0003] There are three main methods for diagnosing exhaust brake valve sticking: First, a pressure sensor is added upstream of the valve body to detect sticking by monitoring abnormal exhaust pressure. Second, a gas flow detection device is used to fix the opening of components such as the intake throttle valve and recirculation valve, and the fault is determined by comparing the gas flow difference when the exhaust throttle valve is open or closed. Third, the brake function logic level and indicator light drive rules are configured through software calibration to indirectly indicate the fault.

[0004] Existing exhaust brake valve sticking diagnostic technologies, relying solely on software calibration and indicator light alerts, cannot directly detect sticking, resulting in low diagnostic accuracy and difficulty in timely and precise fault identification, potentially leading to safety hazards. Therefore, a highly reliable and accurate exhaust brake valve sticking diagnostic solution is urgently needed. Summary of the Invention

[0005] This invention provides a method, apparatus, device, storage medium, and product for diagnosing exhaust brake valve jamming, thereby improving the reliability and accuracy of diagnosing exhaust brake valve jamming.

[0006] According to one aspect of the present invention, a method for diagnosing exhaust brake valve sticking is provided, the method comprising:

[0007] When the vehicle engine is detected to have started successfully, the engine speed and current vehicle operating status are obtained within a preset time period.

[0008] If the preset first exhaust brake valve jamming judgment condition is met based on the engine speed and the current vehicle operating condition, the exhaust brake valve is controlled to enter the inspection state, and the opening and closing state of the exhaust brake valve is controlled in the inspection state. At the same time, the maximum and minimum fuel injection quantities of the exhaust brake valve in the opening and closing state are detected.

[0009] The fuel injection quantity deviation is determined based on the maximum fuel injection quantity and the minimum fuel injection quantity;

[0010] Based on the fuel injection quantity deviation, the stuck test result of the exhaust brake valve is determined, and a vehicle control strategy is generated based on the stuck test result.

[0011] According to another aspect of the present invention, an exhaust brake valve sticking diagnostic device is provided, the device comprising:

[0012] The engine speed acquisition module is used to acquire the engine speed and current vehicle operating conditions within a preset time period when the vehicle engine is detected to have started successfully.

[0013] The fuel injection quantity detection module is used to control the exhaust brake valve to enter the inspection state if the preset first exhaust brake valve jamming judgment condition is met based on the engine speed and the current vehicle operating condition, and to control the opening and closing state of the exhaust brake valve in the inspection state, while detecting the maximum and minimum fuel injection quantity of the exhaust brake valve in the opening and closing state.

[0014] The fuel injection quantity deviation determination module is used to determine the fuel injection quantity deviation based on the maximum fuel injection quantity and the minimum fuel injection quantity;

[0015] The control strategy generation module is used to determine the jamming diagnosis result of the exhaust brake valve based on the fuel injection quantity deviation, and generate a vehicle control strategy based on the jamming diagnosis result.

[0016] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0017] At least one processor; and

[0018] A memory communicatively connected to the at least one processor; wherein,

[0019] The memory stores a computer program that can be executed by the at least one processor, which enables the at least one processor to perform the exhaust brake valve sticking diagnosis method according to any embodiment of the present invention.

[0020] According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing computer instructions for causing a processor to execute and implement the exhaust brake valve jamming diagnosis method according to any embodiment of the present invention.

[0021] According to another aspect of the present invention, a computer program product is provided, comprising a computer program that, when executed by a processor, implements the exhaust brake valve sticking diagnosis method according to any embodiment of the present invention.

[0022] The technical solution of this invention obtains the engine speed and current vehicle operating conditions within a preset time period when a successful engine start is detected. If the preset first exhaust brake valve sticking judgment condition is met based on the engine speed and current vehicle operating conditions, the exhaust brake valve is controlled to enter a check state. In the check state, the opening and closing state of the exhaust brake valve is controlled, and the maximum and minimum fuel injection quantities of the exhaust brake valve in the open and closed states are detected. Based on the maximum and minimum fuel injection quantities, the fuel injection quantity deviation is determined. Based on the fuel injection quantity deviation, the sticking diagnosis result of the exhaust brake valve is determined, and a vehicle control strategy is generated based on the sticking diagnosis result. This technical solution achieves the determination of whether sticking has occurred by comparing the fuel injection quantity at idle conditions and the driving conditions with the intake manifold pressure under sticking and non-sticking states of the exhaust brake valve without adding an exhaust manifold pressure sensor. It can effectively and quickly diagnose the existence of exhaust brake valve sticking, while avoiding false alarms, increasing driving safety and vehicle reliability, and improving the reliability and accuracy of exhaust brake valve sticking diagnosis.

[0023] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a flowchart of a method for diagnosing exhaust brake valve sticking according to Embodiment 1 of the present invention;

[0026] Figure 2 This is a flowchart of a method for diagnosing exhaust brake valve sticking according to Embodiment 2 of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of an exhaust brake valve sticking diagnostic device provided in Embodiment 3 of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of an electronic device that implements the exhaust brake valve jamming diagnosis method of the present invention. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] Example 1

[0032] Figure 1 This is a flowchart of a method for diagnosing exhaust brake valve sticking according to Embodiment 1 of the present invention. This embodiment is applicable to the accurate diagnosis of sticking phenomena in vehicle exhaust brake valves. The method can be executed by an exhaust brake valve sticking diagnostic device, which can be implemented in hardware and / or software and can be configured in an electronic device. Figure 1 As shown, the method includes:

[0033] S110. When the vehicle engine is detected to have started successfully, obtain the engine speed and current vehicle operating conditions within a preset time period.

[0034] S120. If the preset first exhaust brake valve jamming judgment condition is met based on the engine speed and the current vehicle operating condition, the exhaust brake valve is controlled to enter the inspection state, and the opening and closing state of the exhaust brake valve is controlled in the inspection state. At the same time, the maximum and minimum fuel injection quantities of the exhaust brake valve in the opening and closing state are detected.

[0035] S130. Determine the fuel injection quantity deviation based on the maximum and minimum fuel injection quantities.

[0036] S140. Based on the fuel injection quantity deviation, determine the jamming diagnosis result of the exhaust brake valve, and generate a vehicle control strategy based on the jamming diagnosis result.

[0037] Optionally, the first exhaust brake valve sticking judgment condition is: determining the speed fluctuation degree based on the engine speed, judging whether the speed fluctuation degree is less than a preset fluctuation degree threshold; and judging whether the engine speed is less than a preset speed threshold; and judging whether the current vehicle operating condition is idling.

[0038] Specifically, when a successful engine start is detected, and the engine speed obtained within the current preset time period is less than a preset speed threshold, and the engine speed fluctuation is less than a preset fluctuation threshold, and the current vehicle operating condition is idling, the exhaust brake valve is controlled to perform a status check. It should be noted that the engine speed detected within the preset time period can be a speed sequence. Based on the speed sequence, the speed difference between adjacent time points can be determined, and this speed difference is defined as the engine speed fluctuation. The fluctuation threshold and speed threshold can be preset by relevant technical personnel; for example, the speed threshold could be 650 rpm, and the fluctuation threshold could be 10 rpm.

[0039] It should be noted that before the exhaust brake valve enters the inspection state, that is, when the vehicle is powered on, the vehicle is in a pre-inspection state; the pre-inspection state is the vehicle's initial state, and the vehicle does not perform any special actions in the pre-inspection state. In the inspection state, the opening and closing state of the exhaust brake valve is controlled, and the maximum and minimum fuel injection quantities of the exhaust brake valve in the opening and closing state are detected.

[0040] In one optional embodiment, controlling the opening and closing state of the exhaust brake valve in the inspection state, and simultaneously detecting the maximum and minimum fuel injection quantities of the exhaust brake valve in the opening and closing states, includes: in the inspection state, controlling the exhaust brake valve to be in the valve closed state during a first detection time period, and controlling the exhaust brake valve to be in the valve open state during a second detection time period after the first detection time period ends, until exiting the detection state after the second detection time period ends; and detecting the fuel injection quantity of the exhaust brake valve in the valve closed state and the valve open state within the time range of the inspection state to obtain the maximum and minimum fuel injection quantities.

[0041] After entering the inspection state, the exhaust brake valve is kept closed until the first inspection time cycle. For example, the first inspection time cycle can be 5 seconds. After that, the exhaust brake valve is kept open until the end of the second inspection time cycle. For example, the second inspection time cycle can be 3 seconds.

[0042] For example, upon entering the inspection state, the exhaust brake valve is immediately closed, and after a 5-second wait, it is opened. The inspection state is then exited after 3 seconds. It should be noted that the exhaust brake valve is controlled by a solenoid valve as an on / off valve, with only two states: open and closed. During the inspection state, i.e., within the time range of the exhaust brake valve's opening and closing, the fuel injection quantity is collected in real time to obtain the maximum and minimum fuel injection quantities within that time range.

[0043] Based on the maximum and minimum fuel injection quantities, the fuel injection quantity deviation is determined; that is, the difference between the maximum and minimum fuel injection quantities is defined as the fuel injection quantity deviation. Based on the fuel injection quantity deviation, the diagnosis result of the exhaust brake valve sticking is determined.

[0044] In one optional embodiment, the sticking diagnosis result of the exhaust brake valve is determined based on the fuel injection quantity deviation, and a vehicle control strategy is generated based on the sticking diagnosis result, including: if the fuel injection quantity deviation is less than a preset deviation threshold, the sticking diagnosis result is that sticking exists, and the vehicle is controlled to be in a forced idling state as the vehicle control strategy; if the fuel injection quantity deviation is not less than the preset deviation threshold, the sticking diagnosis result is that sticking does not exist, and the vehicle is controlled to enter an unchecked state as the vehicle control strategy.

[0045] If the fuel injection quantity deviation is less than a preset deviation threshold, the jamming diagnosis result is that jamming exists, and the vehicle is controlled to enter a forced idling state as the vehicle control strategy. The deviation threshold can be preset by relevant technical personnel; this embodiment does not impose any restrictions on this. If the fuel injection quantity deviation is not less than the preset deviation threshold, the jamming diagnosis result is that jamming does not exist, and the vehicle is controlled to enter a no-check state as the vehicle control strategy.

[0046] Furthermore, if several consecutive diagnostic tests for the exhaust brake valve show signs of sticking, a fault is reported, and limp driving is initiated. The number of consecutive tests can be preset by the relevant technicians, for example, to three. If any diagnostic test during these consecutive tests shows no sticking, the exhaust brake valve is considered to have recovered from its sticking condition, and normal driving is permitted.

[0047] When the driver finishes driving, the engine is turned off, and the vehicle remains in a no-check state. The next time the engine is powered on, it will start from the pre-check state.

[0048] In one optional embodiment, the intake manifold pressure is monitored in real time during vehicle operation to obtain the current intake manifold pressure, the fuel injection quantity is monitored in real time during operation to obtain the current fuel injection quantity, and the opening and closing state of the exhaust brake valve is monitored in real time to obtain the current opening and closing state of the exhaust brake valve. If, based on the current intake manifold pressure, the current fuel injection quantity, and the current opening and closing state of the exhaust brake valve, it is determined that the preset second exhaust brake valve jamming judgment condition is met, the exhaust brake valve is controlled to enter the inspection state, and jamming diagnosis is performed on the exhaust brake valve to obtain the jamming diagnosis result. A vehicle control strategy is generated based on the jamming diagnosis result.

[0049] The conditions for determining whether the second exhaust brake valve is stuck can be as follows:

[0050] Based on the current engine speed and current fuel injection quantity of the vehicle, a reference intake manifold pressure is determined, and based on the reference intake manifold pressure and the current intake manifold pressure, the intake manifold pressure deviation is determined; it is determined whether the intake manifold pressure deviation is greater than a preset manifold pressure deviation threshold; it is determined whether the current intake manifold pressure is less than a preset manifold pressure threshold; and it is determined whether the current fuel injection quantity is less than a preset fuel injection quantity threshold; and it is determined whether the current opening / closing state of the exhaust brake valve is inactive.

[0051] Specifically, based on the vehicle's current engine speed and current fuel injection quantity, a reference intake manifold pressure can be determined using the engine speed-fuel quantity-manifold pressure mapping table. This table stores the mapping relationship between engine speed, fuel injection quantity, and manifold pressure. A unique manifold pressure can be determined based on the specific engine speed and fuel injection quantity, and this manifold pressure is then designated as the reference intake manifold pressure.

[0052] It should be noted that since the ambient pressure varies during vehicle operation in different environmental scenarios, to further determine the accuracy of the reference intake manifold pressure, the reference intake manifold pressure can be corrected based on the current ambient pressure. This can be done using a pre-built or pre-acquired ambient pressure correction parameter table. This table stores the mapping relationship between ambient pressure and pressure correction values. Looking up the table based on the current ambient pressure yields the current correction value; this current correction value is then used to correct the reference intake manifold pressure, resulting in the corrected reference intake manifold pressure. For example, if the current correction value for the current ambient pressure is 2 kPa, and the reference intake manifold pressure is 150 kPa, then the corrected reference intake manifold pressure will be 148 kPa.

[0053] The intake manifold pressure deviation between the reference intake manifold pressure and the current intake manifold pressure is determined. If the intake manifold pressure deviation is greater than a preset manifold pressure deviation threshold, and the current intake manifold pressure is less than a preset manifold pressure threshold, and the current fuel injection quantity is less than a preset fuel injection quantity threshold, and the current open / closed state of the exhaust brake valve is inactive, then it is considered that the exhaust brake valve may be stuck. The exhaust brake valve is then controlled to enter a check state, and its open / closed state is controlled during the check state. During the check state, the exhaust brake valve is controlled to be in the valve closed state during the first detection time period, and after the first detection time period ends, the exhaust brake valve is controlled to be in the valve open state during the second detection time period, until the second detection time period ends and the check state is exited. During the time range of the check state, the fuel injection quantity of the exhaust brake valve in the valve closed state and the valve open state is detected to obtain the maximum and minimum fuel injection quantities. Determine the fuel injection quantity deviation between the maximum and minimum fuel injection quantities. If the fuel injection quantity deviation is less than a preset deviation threshold, the jam diagnosis result is that jamming exists, and the vehicle is controlled to be in a forced idling state as the vehicle control strategy. If the fuel injection quantity deviation is not less than the preset deviation threshold, the jam diagnosis result is that jamming does not exist, and the vehicle is controlled to enter a no-check state as the vehicle control strategy.

[0054] The technical solution of this invention obtains the engine speed and current vehicle operating conditions within a preset time period when a successful engine start is detected. If the preset first exhaust brake valve sticking judgment condition is met based on the engine speed and current vehicle operating conditions, the exhaust brake valve is controlled to enter a check state. In the check state, the opening and closing state of the exhaust brake valve is controlled, and the maximum and minimum fuel injection quantities of the exhaust brake valve in the open and closed states are detected. Based on the maximum and minimum fuel injection quantities, the fuel injection quantity deviation is determined. Based on the fuel injection quantity deviation, the sticking diagnosis result of the exhaust brake valve is determined, and a vehicle control strategy is generated based on the sticking diagnosis result. This technical solution achieves the determination of whether sticking has occurred by comparing the fuel injection quantity at idle conditions and the driving conditions with the intake manifold pressure under sticking and non-sticking states of the exhaust brake valve without adding an exhaust manifold pressure sensor. It can effectively and quickly diagnose the existence of exhaust brake valve sticking, while avoiding false alarms, increasing driving safety and vehicle reliability, and improving the reliability and accuracy of exhaust brake valve sticking diagnosis.

[0055] Example 2

[0056] Figure 2 This is a schematic flowchart of a method for diagnosing exhaust brake valve sticking according to Embodiment 2 of the present invention. This embodiment provides a preferred example based on the above embodiments.

[0057] like Figure 2 As shown, the method includes the following steps:

[0058] S21. When the vehicle engine is detected to have started successfully, obtain the engine speed and current vehicle operating conditions within a preset time period.

[0059] S22. Determine whether the first exhaust brake valve jamming judgment condition is met based on the engine speed and current vehicle operating condition; if yes, proceed to S23; if no, confirm that there is no jamming.

[0060] The conditions for determining if the first exhaust brake valve is stuck are as follows:

[0061] The engine speed fluctuation is determined based on the engine speed, and it is determined whether the engine speed fluctuation is less than a preset fluctuation threshold; and whether the engine speed is less than a preset speed threshold; and whether the current vehicle operating condition is idling.

[0062] S23. Control the exhaust brake valve to enter the inspection state.

[0063] S24. In the inspection state, control the opening and closing state of the exhaust brake valve, and at the same time detect the maximum and minimum fuel injection quantity of the exhaust brake valve in the opening and closing state.

[0064] Specifically, in the inspection state, the exhaust brake valve is controlled to be in the closed state during the first detection time period, and after the first detection time period ends, the exhaust brake valve is controlled to be in the open state during the second detection time period until the second detection time period ends and the inspection state is exited. Within the time range of the inspection state, the fuel injection quantity of the exhaust brake valve in the closed state and the open state is detected to obtain the maximum fuel injection quantity and the minimum fuel injection quantity.

[0065] S25. Determine the fuel injection quantity deviation between the maximum and minimum fuel injection quantities.

[0066] S26A. If the fuel injection quantity deviation is less than the preset deviation threshold, the jam diagnosis result is that jamming exists, and the vehicle will be controlled to be in a forced idling state as the vehicle control strategy.

[0067] S26B If the fuel injection quantity deviation is not less than the preset deviation threshold, the jam diagnosis result is that there is no jam, and the vehicle will be controlled to enter the no-check state as the vehicle control strategy.

[0068] S27. During vehicle operation, the intake manifold pressure is monitored in real time to obtain the current intake manifold pressure, the fuel injection quantity is monitored in real time to obtain the current fuel injection quantity, and the opening and closing status of the exhaust brake valve is monitored in real time to obtain the current opening and closing status of the exhaust brake valve.

[0069] S28. If, based on the current intake manifold pressure, the current fuel injection quantity, and the current opening / closing state of the exhaust brake valve, it is determined that the preset second exhaust brake valve jamming judgment condition is met, the exhaust brake valve is controlled to enter the inspection state, and the exhaust brake valve is jammed to obtain the jamming diagnosis result. Based on the jamming diagnosis result, a vehicle control strategy is generated.

[0070] The conditions for determining if the second exhaust brake valve is stuck are as follows:

[0071] Based on the current engine speed and current fuel injection quantity of the vehicle, a reference intake manifold pressure is determined, and based on the reference intake manifold pressure and the current intake manifold pressure, the intake manifold pressure deviation is determined; it is determined whether the intake manifold pressure deviation is greater than a preset manifold pressure deviation threshold; it is determined whether the current intake manifold pressure is less than a preset manifold pressure threshold; it is determined whether the current fuel injection quantity is less than a preset fuel injection quantity threshold; and it is determined whether the current opening / closing state of the exhaust brake valve is inactive.

[0072] The above technical solution will be described using three specific example scenarios:

[0073] Example 1: When the first exhaust brake valve jamming condition is met, the system enters the inspection state. The exhaust brake valve immediately closes and opens after 5 seconds. This exhaust brake valve is controlled by a solenoid valve and is an on / off valve with only two states: open and closed. After waiting 3 seconds, the system exits the inspection state. During this period, the maximum fuel injection quantity is 18, the minimum fuel injection quantity is 15, and the fuel injection quantity deviation is 3, which is lower than the preset fuel injection quantity deviation threshold of 8. At this time, forced idle is initiated. After repeating the inspection multiple times, if the fuel injection quantity deviation is greater than the fuel injection quantity deviation of 8 during this period, the jamming is considered to have been resolved, and forced idle can be released. If there is still no jamming after multiple inspections (more than 3 times), a fault is reported, and forced limp-start is initiated.

[0074] Example 2: When the first exhaust brake valve jamming condition is met, the system enters a check state, immediately closing the exhaust brake valve and opening it after 5 seconds. This exhaust brake valve is controlled by a solenoid valve and is an on / off valve with only two states: open and closed. The system exits the check state after 3 seconds. During this period, the maximum fuel injection quantity is 25, the minimum is 15, and the fuel injection quantity deviation is 10, exceeding the preset fuel injection quantity deviation threshold, thus entering a no-check state. When the driver finishes driving and the engine is turned off, the system remains in the no-check state until the next power-on, starting from the pre-check state.

[0075] Example 3: When the first exhaust brake valve jamming condition is met, the system enters the inspection state, and the exhaust brake valve immediately closes. After waiting 5 seconds, the valve opens. This exhaust brake valve is controlled by a solenoid valve and is an on / off valve with only two states: open and closed. After waiting 3 seconds, the system exits the inspection state. During this period, the maximum fuel injection quantity is 25, and the minimum fuel injection quantity is 15, with a deviation of 10, which is higher than the preset fuel injection quantity deviation threshold, so the system enters the no-inspection state. During driving, the intake manifold pressure is 100 kPa, and the reference intake manifold pressure is 150 kPa. The pressure deviation between the two is lower than the threshold of 30 kPa, indicating a possible jamming of the exhaust brake valve. If the valve is indeed jammed, the vehicle will experience severe power loss, and the driver will usually stop pressing the accelerator until the idle speed is checked. At this point, after entering the idle condition, the system re-enters the inspection state to diagnose the jamming. At this time, the maximum fuel injection quantity is 25, and the minimum fuel injection quantity is 22, with a deviation of 3, which is lower than the preset fuel injection quantity threshold, so the system forces idle. After more than 3 checks, a fault is reported, and limp-start is initiated.

[0076] Example 3

[0077] Figure 3 This is a schematic diagram of the structure of an exhaust brake valve sticking diagnostic device provided in Embodiment 3 of the present invention. The exhaust brake valve sticking diagnostic device provided in this embodiment of the present invention is suitable for accurately diagnosing the sticking phenomenon of vehicle exhaust brake valves. This exhaust brake valve sticking diagnostic device can be implemented in hardware and / or software, such as... Figure 3 As shown, the device includes: an engine speed acquisition module 301, a fuel injection quantity detection module 302, a fuel injection quantity deviation determination module 303, and a control strategy generation module 304. Among them,

[0078] The engine speed acquisition module 301 is used to acquire the engine speed and current vehicle operating conditions within a preset time period when the vehicle engine is detected to have started successfully.

[0079] The fuel injection quantity detection module 302 is used to control the exhaust brake valve to enter the inspection state if the preset first exhaust brake valve jamming judgment condition is met based on the engine speed and the current vehicle operating condition, and to control the opening and closing state of the exhaust brake valve in the inspection state, while detecting the maximum and minimum fuel injection quantity of the exhaust brake valve in the opening and closing state.

[0080] The fuel injection quantity deviation determination module 303 is used to determine the fuel injection quantity deviation based on the maximum fuel injection quantity and the minimum fuel injection quantity;

[0081] The control strategy generation module 304 is used to determine the jamming diagnosis result of the exhaust brake valve based on the fuel injection quantity deviation, and generate a vehicle control strategy based on the jamming diagnosis result.

[0082] The technical solution of this invention obtains the engine speed and current vehicle operating conditions within a preset time period when a successful engine start is detected. If the preset first exhaust brake valve sticking judgment condition is met based on the engine speed and current vehicle operating conditions, the exhaust brake valve is controlled to enter a check state. In the check state, the opening and closing state of the exhaust brake valve is controlled, and the maximum and minimum fuel injection quantities of the exhaust brake valve in the open and closed states are detected. Based on the maximum and minimum fuel injection quantities, the fuel injection quantity deviation is determined. Based on the fuel injection quantity deviation, the sticking diagnosis result of the exhaust brake valve is determined, and a vehicle control strategy is generated based on the sticking diagnosis result. This technical solution achieves the determination of whether sticking has occurred by comparing the fuel injection quantity at idle conditions and the driving conditions with the intake manifold pressure under sticking and non-sticking states of the exhaust brake valve without adding an exhaust manifold pressure sensor. It can effectively and quickly diagnose the existence of exhaust brake valve sticking, while avoiding false alarms, increasing driving safety and vehicle reliability, and improving the reliability and accuracy of exhaust brake valve sticking diagnosis.

[0083] Optionally, the conditions for determining if the first exhaust brake valve is stuck are as follows:

[0084] The degree of speed fluctuation is determined based on the engine speed, and it is determined whether the degree of speed fluctuation is less than a preset fluctuation threshold; and,

[0085] Determine whether the engine speed is less than a preset speed threshold; and,

[0086] Determine whether the current vehicle operating condition is in an idling state.

[0087] Optional, the fuel injection quantity detection module 302 is specifically used for:

[0088] In the inspection state, the exhaust brake valve is controlled to be in the valve closed state during the first detection time period, and after the first detection time period ends, the exhaust brake valve is controlled to be in the valve open state during the second detection time period, until the second detection time period ends and the inspection state is exited. Within the time range of the inspection state, the fuel injection quantity of the exhaust brake valve in the valve closed state and the valve open state is detected to obtain the maximum fuel injection quantity and the minimum fuel injection quantity.

[0089] Optionally, the control strategy generation module 304 is specifically used for:

[0090] If the fuel injection quantity deviation is less than the preset deviation threshold, the jam diagnosis result is that jamming exists, and the vehicle will be controlled to be in a forced idling state as the vehicle control strategy.

[0091] If the fuel injection quantity deviation is not less than the preset deviation threshold, then the jam diagnosis result is that there is no jam, and the vehicle will be controlled to enter the no-check state as the vehicle control strategy.

[0092] Optionally, the device further includes:

[0093] The manifold pressure monitoring module is used to monitor the intake manifold pressure in real time during vehicle operation to obtain the current intake manifold pressure, monitor the fuel injection quantity in real time during operation to obtain the current fuel injection quantity, and monitor the opening and closing status of the exhaust brake valve in real time to obtain the current opening and closing status of the exhaust brake valve.

[0094] The second jamming judgment module is used to control the exhaust brake valve to enter the inspection state and perform jamming diagnosis on the exhaust brake valve when the preset second exhaust brake valve jamming judgment conditions are met based on the current intake manifold pressure, the current fuel injection quantity and the current opening and closing state of the exhaust brake valve, thereby obtaining the jamming diagnosis result and generating a vehicle control strategy based on the jamming diagnosis result.

[0095] Optionally, the conditions for determining the sticking of the second exhaust brake valve are as follows:

[0096] Based on the current engine speed and current fuel injection quantity of the vehicle, a reference intake manifold pressure is determined, and based on the reference intake manifold pressure and the current intake manifold pressure, an intake manifold pressure deviation is determined.

[0097] Determine whether the intake manifold pressure deviation is greater than a preset manifold pressure deviation threshold; and,

[0098] Determine whether the current intake manifold pressure is less than a preset manifold pressure threshold; and,

[0099] Determine whether the current fuel injection quantity is less than a preset fuel injection quantity threshold; and,

[0100] Determine whether the current open / closed state of the exhaust brake valve is inactive.

[0101] The exhaust brake valve jamming diagnostic device provided in this embodiment of the invention can execute the exhaust brake valve jamming diagnostic method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the method.

[0102] Example 4

[0103] Figure 4A schematic diagram of an electronic device 40 that can be used to implement embodiments of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0104] like Figure 4 As shown, the electronic device 40 includes at least one processor 41 and a memory, such as a read-only memory (ROM) 42 or a random access memory (RAM) 43, communicatively connected to the at least one processor 41. The memory stores computer programs executable by the at least one processor. The processor 41 can perform various appropriate actions and processes based on the computer program stored in the ROM 42 or loaded from storage unit 48 into the RAM 43. The RAM 43 may also store various programs and data required for the operation of the electronic device 40. The processor 41, ROM 42, and RAM 43 are interconnected via a bus 44. An input / output (I / O) interface 45 is also connected to the bus 44.

[0105] Multiple components in electronic device 40 are connected to I / O interface 45, including: input unit 46, such as keyboard, mouse, etc.; output unit 47, such as various types of monitors, speakers, etc.; storage unit 48, such as disk, optical disk, etc.; and communication unit 49, such as network card, modem, wireless transceiver, etc. Communication unit 49 allows electronic device 40 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0106] Processor 41 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 41 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 41 performs the various methods and processes described above, such as the exhaust brake valve sticking diagnostic method.

[0107] In some embodiments, the exhaust brake valve sticking diagnostic method may be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 48. In some embodiments, part or all of the computer program may be loaded and / or installed on electronic device 40 via ROM 42 and / or communication unit 49. When the computer program is loaded into RAM 43 and executed by processor 41, one or more steps of the exhaust brake valve sticking diagnostic method described above may be performed. Alternatively, in other embodiments, processor 41 may be configured to perform the exhaust brake valve sticking diagnostic method by any other suitable means (e.g., by means of firmware).

[0108] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0109] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0110] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0111] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0112] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or middleware components (e.g., application servers), or frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0113] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0114] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0115] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for diagnosing exhaust brake valve sticking, characterized in that, include: When the vehicle engine is detected to have started successfully, the engine speed and current vehicle operating status are obtained within a preset time period. If the preset first exhaust brake valve jamming judgment condition is met based on the engine speed and the current vehicle operating condition, the exhaust brake valve is controlled to enter the inspection state, and the opening and closing state of the exhaust brake valve is controlled in the inspection state. At the same time, the maximum and minimum fuel injection quantities of the exhaust brake valve in the opening and closing state are detected. The fuel injection quantity deviation is determined based on the maximum fuel injection quantity and the minimum fuel injection quantity; Based on the fuel injection quantity deviation, the stuck diagnosis result of the exhaust brake valve is determined, and a vehicle control strategy is generated based on the stuck diagnosis result. The conditions for determining whether the first exhaust brake valve is stuck are as follows: The degree of speed fluctuation is determined based on the engine speed, and it is determined that the degree of speed fluctuation is less than a preset fluctuation threshold; and, Determine that the engine speed is less than a preset speed threshold; and, It is determined that the current vehicle operating condition is idling. The step of determining the sticking diagnosis result of the exhaust brake valve based on the fuel injection quantity deviation, and generating a vehicle control strategy based on the sticking diagnosis result, includes: If the fuel injection quantity deviation is less than the preset deviation threshold, the jam diagnosis result is that jamming exists, and the vehicle will be controlled to be in a forced idling state as the vehicle control strategy. If the fuel injection quantity deviation is not less than the preset deviation threshold, then the jam diagnosis result is that there is no jam, and the vehicle will be controlled to enter the no-check state as the vehicle control strategy.

2. The method according to claim 1, characterized in that, The step of controlling the opening and closing state of the exhaust brake valve under the inspection state, and simultaneously detecting the maximum and minimum fuel injection quantities of the exhaust brake valve under the opening and closing state, includes: In the inspection state, the exhaust brake valve is controlled to be in the valve closed state during the first detection time period, and after the first detection time period ends, the exhaust brake valve is controlled to be in the valve open state during the second detection time period, until the inspection state ends after the second detection time period. During the time range of the inspection state, the fuel injection quantity of the exhaust brake valve in the valve closed state and the valve open state is detected to obtain the maximum fuel injection quantity and the minimum fuel injection quantity.

3. The method according to claim 1, characterized in that, The method further includes: During the vehicle's operation, the intake manifold pressure is monitored in real time to obtain the current intake manifold pressure, the fuel injection quantity is monitored in real time to obtain the current fuel injection quantity, and the opening and closing status of the exhaust brake valve is monitored in real time to obtain the current opening and closing status of the exhaust brake valve. If, based on the current intake manifold pressure, the current fuel injection quantity, and the current opening / closing state of the exhaust brake valve, it is determined that the preset second exhaust brake valve jamming judgment condition is met, the exhaust brake valve is controlled to enter the inspection state, and the exhaust brake valve is jammed to obtain the jamming diagnosis result. Based on the jamming diagnosis result, a vehicle control strategy is generated.

4. The method according to claim 3, characterized in that, The conditions for determining whether the second exhaust brake valve is stuck are as follows: Based on the current engine speed and current fuel injection quantity of the vehicle, a reference intake manifold pressure is determined, and based on the reference intake manifold pressure and the current intake manifold pressure, an intake manifold pressure deviation is determined. Determine that the intake manifold pressure deviation is greater than a preset manifold pressure deviation threshold; and, Determine that the current intake manifold pressure is less than a preset manifold pressure threshold; as well as, Determine that the current fuel injection quantity is less than a preset fuel injection quantity threshold; as well as, The current open / closed state of the exhaust brake valve is determined to be inactive.

5. A diagnostic device for exhaust brake valve sticking, used to perform the method according to any one of claims 1-4, characterized in that, include: The engine speed acquisition module is used to acquire the engine speed and current vehicle operating conditions within a preset time period when the vehicle engine is detected to have started successfully. The fuel injection quantity detection module is used to control the exhaust brake valve to enter the inspection state if the preset first exhaust brake valve jamming judgment condition is met based on the engine speed and the current vehicle operating condition, and to control the opening and closing state of the exhaust brake valve in the inspection state, while detecting the maximum and minimum fuel injection quantity of the exhaust brake valve in the opening and closing state. The fuel injection quantity deviation determination module is used to determine the fuel injection quantity deviation based on the maximum fuel injection quantity and the minimum fuel injection quantity; The control strategy generation module is used to determine the jamming diagnosis result of the exhaust brake valve based on the fuel injection quantity deviation, and generate a vehicle control strategy based on the jamming diagnosis result.

6. An electronic device, characterized in that, The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the exhaust brake valve sticking diagnosis method according to any one of claims 1-4.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the exhaust brake valve sticking diagnosis method according to any one of claims 1-4.

8. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the exhaust brake valve sticking diagnosis method according to any one of claims 1-4.

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