Fault diagnosis method, device, equipment, storage medium and program product

Abstract

The application relates to a fault diagnosis method and device, computer equipment, a storage medium and a computer program product. The method comprises the following steps: in the case that the hydraulic retarder is in the opening working process at the current moment, acquiring a current maximum pressure value, an actual rising duration, a rated maximum pressure value and a theoretical rising duration; determining whether the one-way valve is in a fault state according to the current maximum pressure value, the actual rising duration, the rated maximum pressure value and the theoretical rising duration; in the case that the hydraulic retarder is in the exiting working process at the current moment, acquiring a plurality of first pressure values, and determining whether the one-way valve is in the fault state according to the plurality of first pressure values; in the case that the one-way valve is in the fault state, determining the fault condition of the one-way valve, and displaying the fault condition of the one-way valve in a fault display area of an instrument panel. The method can identify the one-way valve fault point without disassembling the hydraulic retarder.

Description

Technical Field

[0001] This application relates to the field of vehicle fault diagnosis technology, and in particular to a fault diagnosis method, apparatus, computer equipment, storage medium and computer program product. Background Technology

[0002] A hydraulic retarder utilizes the damping effect of fluid flow to generate a counter-driving braking force opposite to the forward driving force, thereby slowing down the vehicle and providing auxiliary braking. The hydraulic retarder mainly consists of core components such as a stator, rotor, sensors, proportional valve, heat exchanger, check valve, and muffler. When the hydraulic retarder is activated, hydraulic fluid enters the working chamber formed by the stator and rotor. The fluid rotates and accelerates within the working chamber, impacting the rotor and generating a counter-driving force. Throughout this process, the hydraulic retarder converts the vehicle's mechanical energy into the internal energy of the fluid. After the fluid is heated, it exits the working chamber through the return channel into the oil sump. The check valve in the return channel connecting the working chamber and the oil sump plays a crucial role. It prevents backflow of fluid from the oil sump into the working chamber and also requires a certain opening pressure. If the check valve malfunctions during operation, the hydraulic retarder's braking torque cannot be properly established, and oil leakage between the working chamber and the oil sump can occur.

[0003] In traditional technology, the hydraulic retarder body can only be disassembled to check whether the check valve is in a faulty state when a malfunction is suspected.

[0004] However, this method can easily lead to the mistaken belief that the check valve is malfunctioning. Furthermore, disassembling the hydraulic retarder to check whether the check valve is faulty is cumbersome and time-consuming. Summary of the Invention

[0005] Therefore, it is necessary to provide a fault diagnosis method, device, computer equipment, computer-readable storage medium, and computer program product that can identify whether a check valve is in a faulty state without disassembling the hydraulic retarder, in order to address the above-mentioned technical problems.

[0006] Firstly, this application provides a fault diagnosis method. The method is applied to a vehicle, the vehicle including a hydraulic retarder, a pressure sensor, and an instrument panel. The hydraulic retarder includes a one-way valve, a working chamber, and a return oil passage. The working chamber is connected to the one-way valve via the return oil passage. The pressure sensor is located between the working chamber and the one-way valve. The pressure sensor is used to detect the pressure value of the oil in the return oil passage. The instrument panel includes a fault display area. The method includes:

[0007] If the hydraulic retarder is currently in operation, obtain the current maximum pressure value, actual rise time, rated maximum pressure value, and theoretical rise time; the actual rise time is the time taken for the pressure value of the hydraulic retarder to reach the current maximum pressure value during the operation process; the theoretical rise time is the time taken for the pressure value of the hydraulic retarder to reach the rated maximum pressure value during the operation process.

[0008] Based on the current maximum pressure value, the actual rise time, the rated maximum pressure value, and the theoretical rise time, determine whether the check valve is in a fault state;

[0009] When the hydraulic retarder is in the process of exiting operation at the current moment, multiple first pressure values ​​are acquired. The multiple first pressure values ​​are the pressure values ​​acquired by the pressure sensor during the process of the hydraulic retarder exiting operation.

[0010] Based on multiple first pressure values, determine whether the one-way valve is in a faulty state;

[0011] If the check valve is in a faulty state, determine the fault condition of the check valve and display the fault condition of the check valve in the fault display area of ​​the instrument panel.

[0012] In one embodiment, if the hydraulic retarder is in operation at the current moment, the current maximum pressure value and the actual rise time are obtained;

[0013] Obtain the current speed of the first vehicle driveshaft and the percentage value of the first requested torque;

[0014] The rated maximum pressure value and the theoretical rise time are obtained based on the first vehicle driveshaft speed and the first requested torque percentage value.

[0015] In one embodiment, determining whether the check valve is in a fault state based on the current maximum pressure value, the actual rise time, the rated maximum pressure value, and the theoretical rise time includes:

[0016] If the first ratio of the current maximum pressure value to the rated maximum pressure value is greater than a first preset value, it is determined that the one-way valve is in a fault state.

[0017] If the second ratio of the actual rise time to the theoretical rise time is greater than a second preset value, the one-way valve is determined to be in a fault state.

[0018] In one embodiment, determining whether the one-way valve is in a fault state based on a plurality of first pressure values ​​includes:

[0019] Based on multiple first pressure values, determine whether there is an actual jump pressure value; the actual jump pressure value is the instantaneous jump pressure value that occurs when the pressure sensor exits operation during the process of the hydraulic retarder.

[0020] If the actual jump pressure value is not present, the check valve is determined to be in a faulty state.

[0021] Given the actual jump pressure value, the actual jump time is obtained; the actual jump time is the time taken from the pressure value at which the hydraulic retarder exits the working process to the actual jump pressure value.

[0022] Obtain the current percentage value of the second vehicle driveshaft speed and the second requested torque;

[0023] Based on the percentage value of the second vehicle drive shaft speed and the second requested torque, the theoretical jump time and the rated jump pressure value are obtained; the theoretical jump time is the time taken for the pressure value during the hydraulic retarder's exit from operation to reach the rated jump pressure value;

[0024] If the third ratio of the actual transition time to the theoretical transition time is greater than a third preset value, the one-way valve is determined to be in a fault state.

[0025] In one embodiment, the fault condition includes a fault type and a fault level; the fault type includes a jamming fault and a stuck fault; the fault level includes a first fault level and a second fault level; determining the fault condition of the check valve when the check valve is in a faulty state includes:

[0026] If the first ratio of the current maximum pressure value to the rated maximum pressure value is greater than a first preset value, the fault type of the one-way valve is determined to be the jamming fault, and the fault level is the second fault level.

[0027] If the second ratio of the actual rise time to the theoretical rise time is less than or equal to the fourth preset value, the fault type of the one-way valve is determined to be the jamming fault, and the fault level is the first fault level.

[0028] If the second ratio of the actual rise time to the theoretical rise time is greater than the fourth preset value, the fault type of the one-way valve is determined to be the jamming fault, and the fault level is the second fault level.

[0029] The fourth preset value is greater than the second preset value.

[0030] In one embodiment, determining the fault condition of the check valve when it is in a faulty state includes:

[0031] In the absence of the actual jump pressure value, the fault type of the check valve is determined to be a jamming fault, and the fault level is the second fault level.

[0032] If the third ratio of the actual jump duration to the theoretical jump duration is less than or equal to the fifth preset value, the fault type of the one-way valve is determined to be the jamming fault, and the fault level is the first fault level.

[0033] If the third ratio of the actual jump duration to the theoretical jump duration is greater than the fifth preset value, the fault type of the one-way valve is determined to be the jamming fault, and the fault level is the second fault level.

[0034] The fifth preset value is greater than the third preset value.

[0035] Secondly, this application also provides a fault diagnosis device. The device is applied to a vehicle, the vehicle including a hydraulic retarder, a pressure sensor, and an instrument panel. The hydraulic retarder includes a one-way valve, a working chamber, and a return oil passage. The working chamber is connected to the one-way valve through the return oil passage. The pressure sensor is located between the working chamber and the one-way valve. The pressure sensor is used to detect the pressure value of the oil in the return oil passage. The instrument panel includes a fault display area. The device includes:

[0036] The maximum pressure and duration acquisition module is used to acquire the current maximum pressure, actual rise time, rated maximum pressure, and theoretical rise time when the hydraulic retarder is not in operation at the current moment. The actual rise time is the time taken for the pressure value of the hydraulic retarder to reach the current maximum pressure value during the initiation of operation. The theoretical rise time is the time taken for the pressure value of the hydraulic retarder to reach the rated maximum pressure value during the initiation of operation.

[0037] The first fault judgment module is used to determine whether the one-way valve is in a fault state based on the current maximum pressure value, the actual rise time, the rated maximum pressure value and the theoretical rise time.

[0038] The first pressure value acquisition module is used to acquire multiple first pressure values ​​when the hydraulic retarder is in the process of exiting operation at the current moment. The multiple first pressure values ​​are the pressure values ​​acquired by the pressure sensor during the process of the hydraulic retarder exiting operation.

[0039] The second fault determination module is used to determine whether the one-way valve is in a fault state based on multiple first pressure values.

[0040] The fault condition determination module is used to determine the fault condition of the check valve when the check valve is in a fault state, and to display the fault condition of the check valve in the fault display area of ​​the instrument panel.

[0041] Thirdly, this application also provides a computer device. The computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to perform the following steps:

[0042] If the hydraulic retarder is currently in operation, obtain the current maximum pressure value, actual rise time, rated maximum pressure value, and theoretical rise time; the actual rise time is the time taken for the pressure value of the hydraulic retarder to reach the current maximum pressure value during the operation process; the theoretical rise time is the time taken for the pressure value of the hydraulic retarder to reach the rated maximum pressure value during the operation process.

[0043] Based on the current maximum pressure value, the actual rise time, the rated maximum pressure value, and the theoretical rise time, determine whether the check valve is in a fault state;

[0044] When the hydraulic retarder is in the process of exiting operation at the current moment, multiple first pressure values ​​are acquired. The multiple first pressure values ​​are the pressure values ​​acquired by the pressure sensor during the process of the hydraulic retarder exiting operation.

[0045] Based on multiple first pressure values, determine whether the one-way valve is in a faulty state;

[0046] If the check valve is in a faulty state, determine the fault condition of the check valve and display the fault condition of the check valve in the fault display area of ​​the instrument panel.

[0047] Fourthly, this application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program thereon, which, when executed by a processor, performs the following steps:

[0048] If the hydraulic retarder is currently in operation, obtain the current maximum pressure value, actual rise time, rated maximum pressure value, and theoretical rise time; the actual rise time is the time taken for the pressure value of the hydraulic retarder to reach the current maximum pressure value during the operation process; the theoretical rise time is the time taken for the pressure value of the hydraulic retarder to reach the rated maximum pressure value during the operation process.

[0049] Based on the current maximum pressure value, the actual rise time, the rated maximum pressure value, and the theoretical rise time, determine whether the check valve is in a fault state;

[0050] When the hydraulic retarder is in the process of exiting operation at the current moment, multiple first pressure values ​​are acquired. The multiple first pressure values ​​are the pressure values ​​acquired by the pressure sensor during the process of the hydraulic retarder exiting operation.

[0051] Based on multiple first pressure values, determine whether the one-way valve is in a faulty state;

[0052] If the check valve is in a faulty state, determine the fault condition of the check valve and display the fault condition of the check valve in the fault display area of ​​the instrument panel.

[0053] Fifthly, this application also provides a computer program product. The computer program product includes a computer program that, when executed by a processor, performs the following steps:

[0054] If the hydraulic retarder is currently in operation, obtain the current maximum pressure value, actual rise time, rated maximum pressure value, and theoretical rise time; the actual rise time is the time taken for the pressure value of the hydraulic retarder to reach the current maximum pressure value during the operation process; the theoretical rise time is the time taken for the pressure value of the hydraulic retarder to reach the rated maximum pressure value during the operation process.

[0055] Based on the current maximum pressure value, the actual rise time, the rated maximum pressure value, and the theoretical rise time, determine whether the check valve is in a fault state;

[0056] When the hydraulic retarder is in the process of exiting operation at the current moment, multiple first pressure values ​​are acquired. The multiple first pressure values ​​are the pressure values ​​acquired by the pressure sensor during the process of the hydraulic retarder exiting operation.

[0057] Based on multiple first pressure values, determine whether the one-way valve is in a faulty state;

[0058] If the check valve is in a faulty state, determine the fault condition of the check valve and display the fault condition of the check valve in the fault display area of ​​the instrument panel.

[0059] The aforementioned fault diagnosis method, device, computer equipment, storage medium, and computer program product, when the hydraulic retarder is currently in the active operation phase, acquire the current maximum pressure value, actual rise time, rated maximum pressure value, and theoretical rise time; based on the current maximum pressure value, actual rise time, rated maximum pressure value, and theoretical rise time, determine whether the check valve is in a fault state; when the hydraulic retarder is currently in the deactivated operation phase, acquire multiple first pressure values, and based on the multiple first pressure values, determine whether the check valve is in a fault state; if the check valve is in a fault state, determine the fault condition of the check valve and reset the check valve. The fault information is displayed in the fault display area of ​​the instrument panel. Compared with the traditional technology, which requires disassembling the hydraulic retarder body to check for the faulty check valve when a fault is suspected, this method can identify the fault point of the check valve without disassembling the hydraulic retarder. This improves the safety of the hydraulic retarder during use, reduces the time for fault diagnosis and repair, and lowers maintenance costs. Furthermore, by displaying the fault information of the check valve in the fault display area of ​​the instrument panel, it can promptly remind the user to reduce the driving risks caused by the failure or performance degradation of the hydraulic retarder due to check valve failure, thereby improving driving safety. Attached Figure Description

[0060] Figure 1 This is a flowchart illustrating a fault diagnosis method in one embodiment;

[0061] Figure 2 A structural diagram showing the location of the pressure sensor in one embodiment;

[0062] Figure 3 This is a flowchart illustrating a fault state determination method in one embodiment;

[0063] Figure 4 This is a structural diagram of a fault diagnosis system in one embodiment;

[0064] Figure 5 This is a flowchart illustrating a fault determination method during the startup process in one embodiment.

[0065] Figure 6 This is a flowchart illustrating a fault determination method during the exit process in one embodiment.

[0066] Figure 7 This is a flowchart illustrating a fault diagnosis method during the startup process in one embodiment.

[0067] Figure 8 This is a flowchart illustrating a fault diagnosis method during the exit process in one embodiment.

[0068] Figure 9 This is a flowchart illustrating a fault diagnosis method in another embodiment;

[0069] Figure 10 This is a structural block diagram of a fault diagnosis device in one embodiment;

[0070] Figure 11 This is an internal structural diagram of a computer device in one embodiment;

[0071] Explanation of reference numerals in the attached figures:

[0072] 1: Check valve; 2: Working chamber; 3: Return oil passage; 4: Pressure sensor; 5: Oil sump; 6: Rotor shaft; 7: Oil inlet channel of hydraulic retarder; 8: Gas pressure sensor; 9: Proportional control valve. Detailed Implementation

[0073] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0074] In one embodiment, such as Figure 1 As shown, a fault diagnosis method is provided, applied to a vehicle. The vehicle includes a hydraulic retarder, a pressure sensor, and an instrument panel. The hydraulic retarder includes a one-way valve, a working chamber, and a return oil passage. The working chamber is connected to the one-way valve through the return oil passage. The pressure sensor is located between the working chamber and the one-way valve. The pressure sensor is used to detect the oil pressure value in the return oil passage. The instrument panel includes a fault display area. The method includes the following steps:

[0075] Step 102: If the hydraulic retarder is in the active working process at the current moment, obtain the current maximum pressure value, actual rise time, rated maximum pressure value, and theoretical rise time; the actual rise time is the time taken for the pressure value of the hydraulic retarder in the active working process to reach the current maximum pressure value; the theoretical rise time is the time taken for the pressure value of the hydraulic retarder in the active working process to reach the rated maximum pressure value.

[0076] The vehicle may include a hydraulic retarder, a pressure sensor, and an instrument panel. The hydraulic retarder may include a check valve, a working chamber, and a return oil passage. The working chamber is connected to the check valve via the return oil passage. The pressure sensor is located on the return oil passage between the working chamber and the check valve; the pressure sensor is used to detect the pressure value of the oil in the return oil passage. Specifically, refer to... Figure 2The diagram shows the structure of the pressure sensor, including: a check valve 1, a working chamber 2, a return oil channel 3, a pressure sensor 4, an oil sump 5, a rotor shaft 6, a hydraulic retarder inlet channel 7, a gas pressure sensor 8, and a proportional control valve 9.

[0077] The current maximum pressure value can be detected by the pressure sensor during the initial operation. The rated maximum pressure value can be a preset value, which can be obtained based on the current vehicle operating conditions.

[0078] The actual rise time is the time it takes for the pressure value during the hydraulic retarder's activation process to reach the current maximum pressure value. The theoretical rise time is the time it takes for the pressure value during the hydraulic retarder's activation process to reach the rated maximum pressure value.

[0079] In practice, a timer can be present in the vehicle, and a hydraulic retarder control unit is correspondingly present in the hydraulic retarder control unit. The timer is used to record the actual time taken from when the hydraulic retarder control unit receives a braking request until the pressure value of the hydraulic retarder's return oil passage reaches the current maximum pressure value.

[0080] For example, the current operating status of the hydraulic retarder is detected; if the hydraulic retarder is in the active operating process at the current moment, the current maximum pressure value, actual rise time, rated maximum pressure value, and theoretical rise time are obtained.

[0081] Step 104: Determine whether the check valve is in a fault state based on the current maximum pressure value, the actual rise time, the rated maximum pressure value, and the theoretical rise time.

[0082] For example, if the hydraulic retarder is in operation at the current moment, the check valve is determined to be in a fault state based on the current maximum pressure value, the actual rise time, the rated maximum pressure value, and the theoretical rise time.

[0083] Step 106: When the hydraulic retarder is in the process of exiting operation at the current moment, acquire multiple first pressure values. The multiple first pressure values ​​are the pressure values ​​acquired by the pressure sensor during the process of the hydraulic retarder exiting operation.

[0084] The pressure sensor can be used to measure multiple first pressure values ​​during the disengagement process of the hydraulic retarder. For example, multiple first pressure values ​​can be recorded according to a preset sampling time. Specifically, the preset sampling time can be set according to actual conditions, and this invention does not limit it.

[0085] Step 108: Determine whether the one-way valve is in a fault state based on multiple first pressure values.

[0086] For example, if the hydraulic retarder is currently out of operation, multiple first pressure values ​​are acquired to determine whether the check valve is in a fault state based on the multiple first pressure values.

[0087] Step 110: If the check valve is in a faulty state, determine the fault condition of the check valve and display the fault condition of the check valve in the fault display area of ​​the instrument panel.

[0088] The malfunctions of the check valve can include a variety of conditions. The instrument panel can include a fault display area to show the user the malfunction status of the check valve.

[0089] For example, when the check valve is in a faulty state, the fault condition of the check valve is determined and displayed in the fault display area of ​​the instrument panel.

[0090] In the above fault diagnosis method, when the hydraulic retarder is currently in operation, the current maximum pressure value, actual rise time, rated maximum pressure value, and theoretical rise time are acquired; based on the current maximum pressure value, actual rise time, rated maximum pressure value, and theoretical rise time, it is determined whether the check valve is in a fault state; when the hydraulic retarder is currently out of operation, multiple first pressure values ​​are acquired, and based on the multiple first pressure values, it is determined whether the check valve is in a fault state; if the check valve is in a fault state, the fault condition of the check valve is determined, and the fault condition of the check valve is displayed on the instrument. Compared to traditional methods that require disassembling the hydraulic retarder to check for a suspected check valve malfunction, this method identifies check valve faults without disassembling the hydraulic retarder. This improves the safety of the hydraulic retarder during use, reduces troubleshooting and repair time, lowers maintenance costs, and displays the check valve malfunction in the instrument panel's fault display area, promptly alerting users to mitigate driving risks caused by check valve failure or performance degradation of the hydraulic retarder, thus enhancing driving safety.

[0091] In one embodiment, step 102 includes:

[0092] Step 1022: If the hydraulic retarder is in operation at the current moment, obtain the current maximum pressure value and the actual rise time.

[0093] The current maximum pressure value is the maximum pressure value detected by the pressure sensor during the start-up process of the hydraulic retarder. The actual rise time can be the time it takes for the pressure value during the start-up process of the hydraulic retarder to reach the current maximum pressure value.

[0094] Step 1024: Obtain the current speed of the first vehicle driveshaft and the percentage value of the first requested torque.

[0095] Step 1026: Obtain the rated maximum pressure value and theoretical rise time based on the rotational speed of the first vehicle driveshaft and the percentage value of the first requested torque.

[0096] For example, the current speed of the first vehicle driveshaft and the percentage value of the first requested torque can be obtained to determine the current operating condition of the vehicle. Then, using a pre-defined first mapping table, the corresponding rated maximum pressure value and theoretical rise time can be obtained. The first mapping table can store multiple sets of correspondences between the first vehicle driveshaft speed and the percentage value of the first requested torque and the rated maximum pressure value and theoretical rise time.

[0097] The first correspondence table can be pre-stored in the storage unit corresponding to the vehicle. Specifically, the first correspondence table can be a table constructed based on empirical values.

[0098] In practice, a vehicle may contain a gear shift lever and a speed sensor, and a hydraulic retarder control unit may be provided. The gear shift lever can be used to obtain the first requested torque percentage value when the hydraulic retarder is in operation; the speed sensor can be used to obtain the first vehicle driveshaft speed when the hydraulic retarder is in operation.

[0099] In the above embodiment, the rated maximum pressure value and theoretical rise time are obtained based on the rotational speed of the first vehicle drive shaft and the percentage value of the first requested torque. This speeds up the acquisition of the rated maximum pressure value and the theoretical rise pressure value by reading the table, thereby improving the fault diagnosis efficiency of the one-way valve.

[0100] In one embodiment, step 104 includes:

[0101] Step 1042: If the first ratio of the current maximum pressure value to the rated maximum pressure value is greater than a first preset value, the check valve is determined to be in a fault state.

[0102] Step 1044: If the second ratio of the actual rise time to the theoretical rise time is greater than a second preset value, the one-way valve is determined to be in a fault state.

[0103] For example, if the hydraulic retarder is currently in operation and the first ratio of the current maximum pressure value to the rated maximum pressure value is greater than a first preset value, the check valve is determined to be in a fault state. If the hydraulic retarder is currently in operation and the first ratio of the current maximum pressure value to the rated maximum pressure value is not greater than the first preset value, the check valve is determined not to be in a fault state.

[0104] If the second ratio of the actual rise time to the theoretical rise time is greater than the second preset value, the check valve is determined to be in a fault state; if the second ratio of the actual rise time to the theoretical rise time is not greater than the second preset value, the check valve is determined to be not in a fault state.

[0105] Specifically, the magnitudes of the first preset value and the second preset value can be set based on empirical values, and this invention does not limit them here.

[0106] In the above embodiments, when it is identified that the hydraulic retarder is in the open working process at the current moment, the check valve is determined to be in a fault state by the first ratio of the current maximum pressure value to the rated maximum pressure value and the second ratio of the actual rise time to the theoretical rise time, thereby realizing a more comprehensive fault diagnosis of the check valve.

[0107] In one embodiment, reference Figure 3 A flowchart illustrating a method for obtaining theoretical jump time and rated jump pressure value is shown. Step 108 includes:

[0108] Step 302: Based on multiple first pressure values, determine whether there is an actual jump pressure value; the actual jump pressure value is the pressure value that the pressure sensor experiences during the instantaneous jump pressure value when the hydraulic retarder exits operation.

[0109] Among these, the multiple first pressure values ​​can be the pressure values ​​acquired by the pressure sensor during the process of the hydraulic retarder disengaging. Specifically, multiple first pressure values ​​can be recorded according to a preset sampling time.

[0110] The actual jump pressure value is the instantaneous pressure value that occurs when the pressure sensor jumps during the process of the hydraulic retarder disengaging. Specifically, the actual jump pressure value is the instantaneous rise in oil pressure that occurs when the hydraulic retarder disengages and the oil pressure decreases due to the closure of the fluid passage.

[0111] Step 304: If the actual jump pressure value does not exist, determine that the one-way valve is in a fault state.

[0112] Step 306: If the actual jump pressure value exists, obtain the actual jump time; the actual jump time is the time taken from the pressure value at which the hydraulic retarder exits the working process to the actual jump pressure value.

[0113] Step 308: Obtain the current speed of the second vehicle driveshaft and the percentage value of the second requested torque.

[0114] Step 310: Based on the second vehicle drive shaft speed and the second requested torque percentage value, obtain the theoretical jump time and the rated jump pressure value; the theoretical jump time is the time taken for the hydraulic retarder to reach the rated jump pressure value from the pressure value during the process of exiting operation.

[0115] In practice, a vehicle may contain a timer, a gear shift lever, and a speed sensor. A hydraulic retarder control unit is also present. The timer records the actual time taken from when the hydraulic retarder control unit receives a brake disengagement request until the pressure in the retarder's return oil passage reaches the actual jump pressure value. The speed sensor can be used to obtain the vehicle's driveshaft speed when the hydraulic retarder is not in the disengagement process; the gear shift lever can be used to obtain the second requested torque percentage value when the hydraulic retarder is not in the disengagement process.

[0116] Step 312: If the third ratio of the actual transition time to the theoretical transition time is greater than a third preset value, the check valve is determined to be in a fault state.

[0117] For example, if no actual jump pressure value exists, the check valve is determined to be in a faulty state. If an actual jump pressure value exists, the actual jump duration and the theoretical jump duration are obtained. If a third ratio of the actual jump duration to the theoretical jump duration is greater than a third preset value, the check valve is determined to be in a faulty state. If the third ratio of the actual jump duration to the theoretical jump duration is not greater than the third preset value, the check valve is determined not to be in a faulty state.

[0118] In the above embodiments, when an actual jump pressure value exists, the theoretical jump time and rated jump pressure value are obtained based on the percentage value of the second vehicle drive shaft speed and the second requested torque. By reading the table, the speed of obtaining the theoretical jump time and rated jump pressure value is accelerated, thereby improving the fault diagnosis efficiency of the one-way valve.

[0119] To better understand the fault diagnosis process, an example is provided for reference. Figure 4The diagram shows a structural diagram of a fault diagnosis system, including: a pressure sensor 402, a gear lever 404, a timer 406, a speed sensor 408, a hydraulic retarder control unit 410, a vehicle control unit 412, and a fault display area 414 on the instrument panel.

[0120] Pressure sensor 402 is used to detect the pressure value of the oil in the return oil channel. Specifically, it is used to detect the current maximum pressure value during the start-up process of the hydraulic retarder and multiple first pressure values ​​during the shutdown process.

[0121] The gear lever 404 is used to detect the first requested torque percentage value during the hydraulic retarder's activation process and the second requested torque percentage value during the hydraulic retarder's deactivation process.

[0122] Timer 406 is used to detect the actual rise time and the actual jump time.

[0123] The speed sensor 408 is used to acquire the vehicle's speed, including the speed of the first vehicle driveshaft and the speed of the second vehicle driveshaft.

[0124] The hydraulic retarder control unit 410 is used to control the hydraulic retarder.

[0125] The vehicle control unit 412 is used to receive fault information of the one-way valve from the CAN bus.

[0126] The fault display area 414 on the instrument panel is used to receive fault information of the one-way valve from the vehicle control unit 412.

[0127] In one embodiment, the fault condition includes a fault type and a fault level; the fault type includes a jamming fault and a stuck fault; the fault level includes a first fault level and a second fault level; Reference Figure 5 The diagram illustrates a fault determination method during startup. Step 210 includes:

[0128] Step 502: If the first ratio of the current maximum pressure value to the rated maximum pressure value is greater than the first preset value, determine that the fault type of the one-way valve is the jamming fault, and the fault level is the second fault level.

[0129] Step 504: If the second ratio of the actual rise time to the theoretical rise time is less than or equal to the fourth preset value, determine that the fault type of the one-way valve is the jamming fault, and the fault level is the first fault level.

[0130] Step 506: If the second ratio of the actual rise time to the theoretical rise time is greater than the fourth preset value, determine that the fault type of the one-way valve is the jamming fault, and the fault level is the second fault level; wherein, the fourth preset value is greater than the second preset value.

[0131] The fault conditions include fault type and fault severity. Fault types include jamming faults and stuck faults. Fault severity includes first fault severity and second fault severity. The fourth preset value is greater than the second preset value. The severity of a stuck fault is greater than that of a jamming fault. The severity of the second fault severity is greater than that of the first fault severity.

[0132] For example, the first preset value, the second preset value, and the fourth preset value are empirical values.

[0133] In the above embodiments, the first preset value, the second preset value, and the fourth preset value are empirical values. The fault type and fault level of the one-way valve are judged based on the first preset value, the second preset value, and the fourth preset value, and the corresponding fault type and fault level are displayed in the fault display area of ​​the instrument panel. This enables timely reminders to users, thereby reducing the driving risks caused by the failure or performance degradation of the hydraulic retarder due to the one-way valve failure and improving driving safety.

[0134] In one embodiment, reference Figure 6 The flowchart illustrates the fault determination method during the exit process. Step 210 includes:

[0135] Step 602: If the actual jump pressure value does not exist, determine that the fault type of the one-way valve is a jamming fault, and the fault level is the second fault level.

[0136] Step 604: If the third ratio of the actual jump duration to the theoretical jump duration is less than or equal to the fifth preset value, the fault type of the one-way valve is determined to be the jamming fault, and the fault level is the first fault level.

[0137] Step 606: If the third ratio of the actual jump duration to the theoretical jump duration is greater than the fifth preset value, determine that the fault type of the one-way valve is the jamming fault, and the fault level is the second fault level; wherein, the fifth preset value is greater than the third preset value.

[0138] Among them, the third and fifth preset values ​​are both empirical values.

[0139] In the above embodiments, the third preset value and the fifth preset value are empirical values. The fault type and fault level of the one-way valve are judged based on the third preset value and the fifth preset value, and the corresponding fault type and fault level are displayed in the fault display area of ​​the instrument panel. This enables timely reminders to users, thereby reducing the driving risks caused by the failure or performance degradation of the hydraulic retarder due to the one-way valve failure and improving driving safety.

[0140] To better understand the fault diagnosis process, an example will be provided. (Refer to...) Figure 7 The diagram illustrates a fault diagnosis method during the startup process.

[0141] Step 702: If the hydraulic retarder is in operation at the current moment, obtain the current maximum pressure value and the actual lifting time.

[0142] Step 704: Obtain the rated maximum pressure value.

[0143] Step 706: If the first ratio of the current maximum pressure value to the rated maximum pressure value is greater than the first preset value, determine that the fault type of the check valve is a jamming fault and the fault level is the second fault level.

[0144] Step 708: Obtain the theoretical ascent time.

[0145] Step 710: If the second ratio of the actual rise time to the theoretical rise time is greater than the second preset value, and the second ratio of the actual rise time to the theoretical rise time is less than or equal to the fourth preset value, the fault type of the one-way valve is determined to be a jamming fault, and the fault level is the first fault level.

[0146] Step 712: If the second ratio of the actual rise time to the theoretical rise time is greater than the second preset value, and the second ratio of the actual rise time to the theoretical rise time is greater than the fourth preset value, the fault type of the check valve is determined to be a jamming fault, and the fault level is the second fault level.

[0147] To better understand the fault diagnosis process, an example will be provided. (Refer to...) Figure 8 The diagram illustrates a fault diagnosis method during the exit process.

[0148] Step 802: If the hydraulic retarder is currently out of operation, acquire multiple first pressure values.

[0149] Step 804: Determine whether there is an actual jump pressure value based on multiple first pressure values.

[0150] Step 806: If there is no actual jump pressure value, determine that the check valve is in a fault state.

[0151] Step 808: In the absence of an actual jump pressure value, determine the fault type of the check valve as a jammed fault, and the fault level as the second fault level.

[0152] Step 810: Obtain the theoretical jump time and rated jump pressure value.

[0153] Step 812: If the third ratio of the actual jump time to the theoretical jump time is greater than the third preset value and the third ratio is less than or equal to the fifth preset value, the fault type of the one-way valve is determined to be a jamming fault, and the fault level is the first fault level.

[0154] Step 814: If the third ratio of the actual jump time to the theoretical jump time is greater than the third preset value and the third ratio is greater than the fifth preset value, the fault type of the one-way valve is determined to be a jamming fault, and the fault level is the second fault level.

[0155] To better understand the fault diagnosis process, an example will be provided. (Refer to...) Figure 9 The diagram illustrates a flowchart of another fault diagnosis method.

[0156] Step 902: If the hydraulic retarder is in operation at the current moment, obtain the current maximum pressure value and the actual lifting time; obtain the current first vehicle drive shaft speed and the first requested torque percentage value to obtain the rated maximum pressure value and the theoretical lifting time.

[0157] Step 904: If the first ratio of the current maximum pressure value to the rated maximum pressure value is greater than the first preset value, determine that the fault type of the one-way valve is a jamming fault and the fault level is the second fault level.

[0158] Step 906: If the second ratio of the actual rise time to the theoretical rise time is greater than the second preset value, the check valve is determined to be in a fault state.

[0159] Step 908: If the second ratio of the actual rise time to the theoretical rise time is less than or equal to the fourth preset value, the fault type of the check valve is determined to be a jamming fault, and the fault level is the first fault level; if the second ratio of the actual rise time to the theoretical rise time is greater than the fourth preset value, the fault type of the check valve is determined to be a jamming fault, and the fault level is the second fault level.

[0160] The fourth preset value is greater than the second preset value.

[0161] Step 910: If the hydraulic retarder is currently out of operation, acquire multiple first pressure values.

[0162] Among them, multiple first pressure values ​​are the pressure values ​​obtained by the pressure sensor during the process of the hydraulic retarder disengaging from operation.

[0163] Step 912: Determine whether there is an actual jump pressure value based on multiple first pressure values.

[0164] The actual jump pressure value is the instantaneous jump pressure value that occurs when the pressure sensor exits operation during the process of the hydraulic retarder.

[0165] Step 914: In the absence of an actual jump pressure value, determine the fault type of the check valve as a stuck fault, and the fault level as the second fault level.

[0166] Step 916: If an actual jump pressure value exists, obtain the actual jump duration; obtain the percentage value of the second vehicle drive shaft speed and the second requested torque at the current moment; obtain the theoretical jump duration and the rated jump pressure value; if the third ratio of the actual jump duration to the theoretical jump duration is greater than the third preset value, determine that the one-way valve is in a fault state.

[0167] Step 918: If the third ratio of the actual jump time to the theoretical jump time is less than or equal to the fifth preset value, the fault type of the check valve is determined to be a jamming fault, and the fault level is the first fault level.

[0168] Step 920: If the third ratio of the actual jump time to the theoretical jump time is greater than the fifth preset value, the fault type of the check valve is determined to be a jamming fault, and the fault level is the second fault level.

[0169] In this embodiment, when the hydraulic retarder is currently in operation, the current maximum pressure value, actual rise time, rated maximum pressure value, and theoretical rise time are acquired. Based on these values, it is determined whether the check valve is in a faulty state. When the hydraulic retarder is currently out of operation, multiple first pressure values ​​are acquired, and based on these values, it is determined whether the check valve is in a faulty state. If the check valve is in a faulty state, the fault condition is determined, and the fault condition is displayed on the instrument panel. Compared to traditional techniques that require disassembling the hydraulic retarder body to check for a suspected check valve malfunction, this method identifies check valve faults without disassembling the hydraulic retarder. This improves the safety of the hydraulic retarder during use, reduces troubleshooting and repair time, lowers maintenance costs, and displays the check valve malfunction in the instrument panel's fault display area, promptly alerting users to reduce driving risks caused by check valve failure leading to hydraulic retarder malfunction or performance degradation, thus enhancing driving safety.

[0170] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0171] Based on the same inventive concept, this application also provides a fault diagnosis device for implementing the fault diagnosis method described above. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations in one or more fault diagnosis device embodiments provided below can be found in the limitations of the fault diagnosis method described above, and will not be repeated here.

[0172] In one embodiment, such as Figure 10As shown, a fault diagnosis device is provided, which is applied to a vehicle. The vehicle includes a hydraulic retarder, a pressure sensor, and an instrument panel. The hydraulic retarder includes a one-way valve, a working chamber, and a return oil passage. The working chamber is connected to the one-way valve through the return oil passage. The pressure sensor is located between the working chamber and the one-way valve. The pressure sensor is used to detect the pressure value of the oil in the return oil passage. The instrument panel includes a fault display area. The device includes: a maximum pressure value and duration acquisition module 1002, a first fault judgment module 1004, a first pressure value acquisition module 1006, a second fault judgment module 1008, and a fault condition determination module 1010, wherein:

[0173] The maximum pressure value and duration acquisition module 1002 is used to acquire the current maximum pressure value, actual rise time, rated maximum pressure value, and theoretical rise time when the hydraulic retarder is in the active working process at the current moment; the actual rise time is the time taken for the pressure value of the hydraulic retarder in the active working process to reach the current maximum pressure value; the theoretical rise time is the time taken for the pressure value of the hydraulic retarder in the active working process to reach the rated maximum pressure value.

[0174] The first fault judgment module 1004 is used to determine whether the one-way valve is in a fault state based on the current maximum pressure value, the actual rise time, the rated maximum pressure value, and the theoretical rise time.

[0175] The first pressure value acquisition module 1006 is used to acquire multiple first pressure values ​​when the hydraulic retarder is in the process of exiting operation at the current moment. The multiple first pressure values ​​are the pressure values ​​acquired by the pressure sensor during the process of the hydraulic retarder exiting operation.

[0176] The second fault determination module 1008 is used to determine whether the one-way valve is in a fault state based on multiple first pressure values.

[0177] The fault condition determination module 1010 is used to determine the fault condition of the check valve when the check valve is in a fault state, and to display the fault condition of the check valve in the fault display area of ​​the instrument panel.

[0178] In some embodiments, the maximum pressure value and duration acquisition module 1002 includes:

[0179] The actual maximum pressure value and duration acquisition unit is used to acquire the current maximum pressure value and the actual rise time when the hydraulic retarder is in the active working process at the current moment.

[0180] The first speed and torque acquisition unit is used to acquire the current speed of the first vehicle driveshaft and the percentage value of the first requested torque.

[0181] The theoretical maximum pressure value and duration acquisition unit is used to acquire the rated maximum pressure value and the theoretical rise time based on the rotational speed of the first vehicle drive shaft and the first requested torque percentage value.

[0182] In some embodiments, the first fault determination module 1004 includes:

[0183] The first fault determination unit is used to determine that the one-way valve is in a fault state when the first ratio of the current maximum pressure value to the rated maximum pressure value is greater than a first preset value.

[0184] The second fault determination unit is used to determine that the one-way valve is in a fault state when the second ratio of the actual rise time to the theoretical rise time is greater than a second preset value.

[0185] In some embodiments, the second fault determination module 1008 includes:

[0186] The actual jump pressure value determination unit is used to determine whether there is an actual jump pressure value based on multiple first pressure values; the actual jump pressure value is the pressure value that the pressure sensor experiences during the instantaneous jump in pressure value when the hydraulic retarder exits operation.

[0187] The third fault determination unit is used to determine that the one-way valve is in a fault state when the actual jump pressure value does not exist.

[0188] The actual jump time acquisition unit is used to acquire the actual jump time when the actual jump pressure value exists; the actual jump time is the time taken from the pressure value at which the hydraulic retarder exits the working process to the actual jump pressure value.

[0189] The second speed and torque acquisition unit is used to acquire the percentage value of the second vehicle drive shaft speed and the second requested torque at the current moment;

[0190] The theoretical jump pressure value and duration acquisition unit is used to acquire the theoretical jump duration and rated jump pressure value based on the percentage value of the second vehicle drive shaft speed and the second requested torque; the theoretical jump duration is the time taken for the pressure value during the hydraulic retarder's exit from operation to reach the rated jump pressure value;

[0191] The fourth fault determination unit is used to determine that the one-way valve is in a fault state when the third ratio of the actual jump duration to the theoretical jump duration is greater than a third preset value.

[0192] In some embodiments, the fault condition includes a fault type and a fault level; the fault type includes a jamming fault and a stuck fault; the fault level includes a first fault level and a second fault level; the fault condition determination module 1010 includes:

[0193] The first fault condition determination unit is used to determine that the fault type of the one-way valve is the jamming fault and the fault level is the second fault level when the first ratio of the current maximum pressure value to the rated maximum pressure value is greater than the first preset value.

[0194] The second fault condition determination unit is used to determine that the fault type of the one-way valve is the jamming fault and the fault level is the first fault level when the second ratio of the actual rise time to the theoretical rise time is less than or equal to a fourth preset value.

[0195] The third fault condition determination unit is used to determine that the fault type of the one-way valve is the jamming fault and the fault level is the second fault level when the second ratio of the actual rise time to the theoretical rise time is greater than the fourth preset value.

[0196] The fourth preset value is greater than the second preset value.

[0197] In some embodiments, the fault condition determination module 1010 includes:

[0198] The fourth fault condition determination unit is used to determine that the fault type of the one-way valve is a jamming fault and the fault level is the second fault level when the actual jump pressure value does not exist.

[0199] The fifth fault condition determination unit is used to determine the fault type of the one-way valve as the jamming fault and the fault level as the first fault level when the third ratio of the actual jump time to the theoretical jump time is less than or equal to the fifth preset value.

[0200] The sixth fault condition determination unit is used to determine that the fault type of the one-way valve is the jamming fault and the fault level is the second fault level when the third ratio of the actual jump time to the theoretical jump time is greater than the fifth preset value.

[0201] The fifth preset value is greater than the third preset value.

[0202] Each module in the aforementioned fault diagnosis device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of the computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0203] In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 11 As shown, the computer device includes a processor, memory, input / output interfaces, a communication interface, a display unit, and an input device. The processor, memory, and input / output interfaces are connected via a system bus, and the communication interface, display unit, and input device are also connected to the system bus via the input / output interfaces. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The input / output interfaces are used for exchanging information between the processor and external devices. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, NFC (Near Field Communication), or other technologies. When the computer program is executed by the processor, it implements a fault diagnosis method. The display unit is used to form a visually visible image and can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be an LCD screen or an e-ink screen. The input device of the computer device can be a touch layer covering the display screen, or buttons, trackballs, or touchpads set on the casing of the computer device, or external keyboards, touchpads, or mice, etc.

[0204] Those skilled in the art will understand that Figure 11 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0205] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0206] If the hydraulic retarder is currently in operation, obtain the current maximum pressure value, actual rise time, rated maximum pressure value, and theoretical rise time; the actual rise time is the time taken for the pressure value of the hydraulic retarder to reach the current maximum pressure value during the operation process; the theoretical rise time is the time taken for the pressure value of the hydraulic retarder to reach the rated maximum pressure value during the operation process.

[0207] Based on the current maximum pressure value, the actual rise time, the rated maximum pressure value, and the theoretical rise time, determine whether the check valve is in a fault state;

[0208] When the hydraulic retarder is in the process of exiting operation at the current moment, multiple first pressure values ​​are acquired. The multiple first pressure values ​​are the pressure values ​​acquired by the pressure sensor during the process of the hydraulic retarder exiting operation.

[0209] Based on multiple first pressure values, determine whether the one-way valve is in a faulty state;

[0210] If the check valve is in a faulty state, determine the fault condition of the check valve and display the fault condition of the check valve in the fault display area of ​​the instrument panel.

[0211] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0212] If the hydraulic retarder is currently in operation, obtain the current maximum pressure value, actual rise time, rated maximum pressure value, and theoretical rise time; the actual rise time is the time taken for the pressure value of the hydraulic retarder to reach the current maximum pressure value during the operation process; the theoretical rise time is the time taken for the pressure value of the hydraulic retarder to reach the rated maximum pressure value during the operation process.

[0213] Based on the current maximum pressure value, the actual rise time, the rated maximum pressure value, and the theoretical rise time, determine whether the check valve is in a fault state;

[0214] When the hydraulic retarder is in the process of exiting operation at the current moment, multiple first pressure values ​​are acquired. The multiple first pressure values ​​are the pressure values ​​acquired by the pressure sensor during the process of the hydraulic retarder exiting operation.

[0215] Based on multiple first pressure values, determine whether the one-way valve is in a faulty state;

[0216] If the check valve is in a faulty state, determine the fault condition of the check valve and display the fault condition of the check valve in the fault display area of ​​the instrument panel.

[0217] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0218] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data shall comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0219] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0220] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0221] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A fault diagnosis method, characterized in that, The method is applied to a vehicle, the vehicle including a hydraulic retarder, a pressure sensor, and an instrument panel. The hydraulic retarder includes a one-way valve, a working chamber, and a return oil passage. The working chamber is connected to the one-way valve through the return oil passage. The pressure sensor is located between the working chamber and the one-way valve. The pressure sensor is used to detect the pressure value of the oil in the return oil passage. The instrument panel includes a fault display area. The method includes: If the hydraulic retarder is currently in operation, obtain the current maximum pressure value, actual rise time, rated maximum pressure value, and theoretical rise time; the actual rise time is the time taken for the pressure value of the hydraulic retarder to reach the current maximum pressure value during the operation process; the theoretical rise time is the time taken for the pressure value of the hydraulic retarder to reach the rated maximum pressure value during the operation process. Based on the current maximum pressure value, the actual rise time, the rated maximum pressure value, and the theoretical rise time, determine whether the check valve is in a fault state; When the hydraulic retarder is in the process of exiting operation at the current moment, multiple first pressure values ​​are acquired. The multiple first pressure values ​​are the pressure values ​​acquired by the pressure sensor during the process of the hydraulic retarder exiting operation. Based on multiple first pressure values, determine whether the one-way valve is in a faulty state; If the check valve is in a faulty state, determine the fault condition of the check valve and display the fault condition of the check valve in the fault display area of ​​the instrument panel; When the hydraulic retarder is in operation at the current moment, the following information is obtained: the current maximum pressure value, the actual rise time, the rated maximum pressure value, and the theoretical rise time. If the hydraulic retarder is currently in operation, obtain the current maximum pressure value and the actual rise time. Obtain the current speed of the first vehicle driveshaft and the percentage value of the first requested torque; The rated maximum pressure value and the theoretical rise time are obtained based on the first vehicle drive shaft speed and the first requested torque percentage value; The step of determining whether the check valve is in a fault state based on the current maximum pressure value, the actual rise time, the rated maximum pressure value, and the theoretical rise time includes: If the first ratio of the current maximum pressure value to the rated maximum pressure value is greater than a first preset value, it is determined that the one-way valve is in a fault state. If the second ratio of the actual rise time to the theoretical rise time is greater than a second preset value, the one-way valve is determined to be in a fault state. The step of determining whether the one-way valve is in a fault state based on multiple first pressure values ​​includes: Based on multiple first pressure values, determine whether there is an actual jump pressure value; the actual jump pressure value is the instantaneous jump pressure value that occurs when the pressure sensor exits operation during the process of the hydraulic retarder. If the actual jump pressure value is not present, the check valve is determined to be in a faulty state. Given the actual jump pressure value, the actual jump time is obtained; the actual jump time is the time taken from the pressure value at which the hydraulic retarder exits the working process to the actual jump pressure value. Obtain the current percentage value of the second vehicle driveshaft speed and the second requested torque; Based on the percentage value of the second vehicle drive shaft speed and the second requested torque, the theoretical jump time and the rated jump pressure value are obtained; the theoretical jump time is the time taken for the pressure value during the hydraulic retarder's exit from operation to reach the rated jump pressure value; If the third ratio of the actual transition time to the theoretical transition time is greater than a third preset value, the one-way valve is determined to be in a fault state.

2. The method according to claim 1, characterized in that, The fault conditions include fault type and fault level; the fault type includes jamming fault and stuck fault; the fault level includes first fault level and second fault level; determining the fault condition of the check valve when it is in a faulty state includes: If the first ratio of the current maximum pressure value to the rated maximum pressure value is greater than a first preset value, the fault type of the one-way valve is determined to be the jamming fault, and the fault level is the second fault level. If the second ratio of the actual rise time to the theoretical rise time is less than or equal to the fourth preset value, the fault type of the one-way valve is determined to be the jamming fault, and the fault level is the first fault level. If the second ratio of the actual rise time to the theoretical rise time is greater than the fourth preset value, the fault type of the one-way valve is determined to be the jamming fault, and the fault level is the second fault level. The fourth preset value is greater than the second preset value.

3. The method according to claim 2, characterized in that, Determining the fault condition of the check valve when it is in a faulty state includes: In the absence of the actual jump pressure value, the fault type of the check valve is determined to be a jamming fault, and the fault level is the second fault level. If the third ratio of the actual jump duration to the theoretical jump duration is less than or equal to the fifth preset value, the fault type of the one-way valve is determined to be the jamming fault, and the fault level is the first fault level. If the third ratio of the actual jump duration to the theoretical jump duration is greater than the fifth preset value, the fault type of the one-way valve is determined to be the jamming fault, and the fault level is the second fault level. The fifth preset value is greater than the third preset value.

4. A fault diagnosis device, characterized in that, The device is applied to a vehicle, which includes a hydraulic retarder, a pressure sensor, and an instrument panel. The hydraulic retarder includes a one-way valve, a working chamber, and a return oil passage. The working chamber is connected to the one-way valve through the return oil passage. The pressure sensor is located between the working chamber and the one-way valve. The pressure sensor is used to detect the pressure value of the oil in the return oil passage. The instrument panel includes a fault display area. The device includes: The maximum pressure and duration acquisition module is used to acquire the current maximum pressure, actual rise time, rated maximum pressure, and theoretical rise time when the hydraulic retarder is not in operation at the current moment. The actual rise time is the time taken for the pressure value of the hydraulic retarder to reach the current maximum pressure value during the initiation of operation. The theoretical rise time is the time taken for the pressure value of the hydraulic retarder to reach the rated maximum pressure value during the initiation of operation. The first fault judgment module is used to determine whether the one-way valve is in a fault state based on the current maximum pressure value, the actual rise time, the rated maximum pressure value and the theoretical rise time. The first pressure value acquisition module is used to acquire multiple first pressure values ​​when the hydraulic retarder is in the process of exiting operation at the current moment. The multiple first pressure values ​​are the pressure values ​​acquired by the pressure sensor during the process of the hydraulic retarder exiting operation. The second fault determination module is used to determine whether the one-way valve is in a fault state based on multiple first pressure values. The fault condition determination module is used to determine the fault condition of the check valve when the check valve is in a fault state, and to display the fault condition of the check valve in the fault display area of ​​the instrument panel. The module for acquiring the maximum pressure value and duration includes: The actual maximum pressure value and duration acquisition unit is used to acquire the current maximum pressure value and the actual rise time when the hydraulic retarder is in the active working process at the current moment. The first speed and torque acquisition unit is used to acquire the current speed of the first vehicle driveshaft and the percentage value of the first requested torque. The theoretical maximum pressure value and duration acquisition unit is used to acquire the rated maximum pressure value and the theoretical rise time based on the first vehicle drive shaft speed and the first requested torque percentage value; The first fault diagnosis module includes: The first fault determination unit is used to determine that the one-way valve is in a fault state when the first ratio of the current maximum pressure value to the rated maximum pressure value is greater than a first preset value. The second fault determination unit is used to determine that the one-way valve is in a fault state when the second ratio of the actual rising time to the theoretical rising time is greater than a second preset value. The second fault diagnosis module includes: The actual jump pressure value determination unit is used to determine whether there is an actual jump pressure value based on multiple first pressure values; the actual jump pressure value is the pressure value that the pressure sensor experiences during the instantaneous jump in pressure value when the hydraulic retarder exits operation. The third fault determination unit is used to determine that the one-way valve is in a fault state when the actual jump pressure value does not exist. The actual jump time acquisition unit is used to acquire the actual jump time when the actual jump pressure value exists; the actual jump time is the time taken from the pressure value at which the hydraulic retarder exits the working process to the actual jump pressure value. The second speed and torque acquisition unit is used to acquire the percentage value of the second vehicle drive shaft speed and the second requested torque at the current moment; The theoretical jump pressure value and duration acquisition unit is used to acquire the theoretical jump duration and rated jump pressure value based on the percentage value of the second vehicle drive shaft speed and the second requested torque; the theoretical jump duration is the time taken for the pressure value during the hydraulic retarder's exit from operation to reach the rated jump pressure value; The fourth fault determination unit is used to determine that the one-way valve is in a fault state when the third ratio of the actual jump duration to the theoretical jump duration is greater than a third preset value.

5. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the fault diagnosis method according to any one of claims 1 to 3.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the fault diagnosis method according to any one of claims 1 to 3.

7. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the fault diagnosis method according to any one of claims 1 to 3.

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