Methods, devices, and computer equipment for diagnosing faults in hydraulic retarder float valves

Abstract

This application relates to a method, apparatus, and computer device for fault diagnosis of a hydraulic retarder float valve. The method includes: acquiring the operating stage of the hydraulic retarder, wherein the hydraulic retarder includes a start-up stage, a working stage, and an exit stage; acquiring corresponding judgment parameters and reference thresholds based on the operating stage of the hydraulic retarder, wherein the judgment parameters for the start-up stage include the start-up stage detection duration and the start-up stage standard duration, the judgment parameters for the exit stage include the exit stage detection duration and the exit stage standard duration, and the judgment parameters for the working stage include the initial filling rate and the final filling rate inside the working chamber of the hydraulic retarder during the working stage; and determining fault information of the hydraulic retarder float valve based on the judgment parameters and reference thresholds. Through the above-described hydraulic retarder float valve fault diagnosis method, fault diagnosis of the hydraulic retarder float valve can be performed in real time.

Description

Technical Field

[0001] This application relates to the field of vehicle fault diagnosis technology, and in particular to a method, apparatus and computer equipment for diagnosing faults in a hydraulic retarder float valve. Background Technology

[0002] A hydraulic retarder utilizes the damping effect of fluid flow to generate a counter-dragging braking force opposite to the forward driving force, thereby slowing down the vehicle and providing auxiliary braking. A hydraulic retarder mainly consists of core components such as a stator, rotor, sensors, proportional valve, heat exchanger, float valve, and muffler. When the hydraulic retarder is activated, hydraulic fluid enters the working chamber formed by the stator and rotor. Gas within the working chamber is discharged to the atmosphere through the float valve. When the hydraulic retarder reaches the braking torque, the float in the float valve rises under the buoyancy of the hydraulic fluid and seals the top of the float valve. When the hydraulic retarder is deactivated, hydraulic fluid enters the oil sump below the float valve, and the float loses buoyancy and falls back down. The top of the float valve separates from the sealing structure, and air re-enters the working chamber.

[0003] Because float valves need to operate for extended periods, they are considered consumable parts. Failure of the float valve seal will affect the performance of the hydraulic retarder. Therefore, the current practice is to maintain the float valve through regular maintenance. However, due to the influence of the hydraulic retarder's operating conditions, the timing of float valve failure often varies, making it difficult to maintain the float valve in a timely manner using regular maintenance. Summary of the Invention

[0004] Therefore, it is necessary to provide a method, apparatus, computer equipment, computer-readable storage medium, and computer program product for diagnosing faults in hydraulic retarder float valves, which can be used to diagnose faults in hydraulic retarder float valves.

[0005] In a first aspect, this application provides a method for diagnosing faults in a hydraulic retarder float valve, the method comprising:

[0006] The operating stage of the hydraulic retarder is determined, wherein the hydraulic retarder includes a start-up stage, a working stage, and an exit stage;

[0007] According to the operating stage of the hydraulic retarder, the corresponding judgment parameters and reference thresholds are obtained. The judgment parameters corresponding to the start-up stage include the start-up stage detection duration and the start-up stage standard duration. The judgment parameters corresponding to the exit stage include the exit stage detection duration and the exit stage standard duration. The judgment parameters corresponding to the working stage include the initial filling rate and the end filling rate of the working chamber of the hydraulic retarder under the working stage.

[0008] The fault information of the hydraulic retarder float valve is determined based on the judgment parameters and reference thresholds.

[0009] In one embodiment, obtaining the operating stage of the hydraulic retarder includes:

[0010] Obtain the command information received by the hydraulic retarder and the oil pressure value of the hydraulic retarder;

[0011] The operating stage of the hydraulic retarder is determined based on the command information received by the hydraulic retarder and the hydraulic pressure value of the hydraulic retarder. The start-up stage is the stage from when the hydraulic retarder receives the braking request command to when the hydraulic retarder reaches the rated hydraulic pressure value of the current operating condition. The working stage is the stage from when the rated hydraulic pressure inside the working chamber of the hydraulic retarder is reached to when the brake release request command is received. The exit stage is the stage from when the hydraulic retarder receives the brake release request command to when the hydraulic pressure in the working chamber drops to zero.

[0012] In one embodiment, obtaining the corresponding judgment parameters based on the operating stage of the hydraulic retarder includes:

[0013] When the hydraulic retarder is in the start-up phase, the time from when the hydraulic retarder receives the braking request command to when the hydraulic retarder reaches the rated oil pressure value under the current operating condition is obtained, so as to obtain the start-up phase detection duration.

[0014] The standard duration of the start-up phase is obtained based on the external characteristics of the hydraulic retarder, bench calibration data, the current requested braking torque percentage of the hydraulic retarder, and the drive shaft speed.

[0015] In one embodiment, determining the fault information of the hydraulic retarder float valve based on the judgment parameters and reference threshold includes:

[0016] A first time deviation ratio is obtained based on the detection duration of the startup phase and the standard duration of the startup phase.

[0017] The presence and severity of a fault in the float valve of the hydraulic retarder are determined based on the first time deviation ratio and the first preset reference threshold.

[0018] In one embodiment, obtaining the first time deviation ratio based on the startup phase detection duration and the startup phase standard duration includes:

[0019] Obtain the first difference between the detection duration of the startup phase and the standard duration of the startup phase;

[0020] The ratio of the first difference to the standard duration of the startup phase is determined as the first time deviation ratio.

[0021] In one embodiment, obtaining the corresponding judgment parameters based on the operating stage of the hydraulic retarder includes:

[0022] When the hydraulic retarder is in the working phase, the initial filling rate of the working chamber of the hydraulic retarder at the beginning of the working phase and the final filling rate of the working chamber of the hydraulic retarder at the end of the working phase are obtained.

[0023] In one embodiment, determining the fault information of the hydraulic retarder float valve based on the judgment parameters and reference threshold includes:

[0024] Obtain the difference between the final filling rate and the initial filling rate;

[0025] The presence and severity of a fault in the float valve of the hydraulic retarder are determined based on the difference in filling rate and the second preset reference threshold.

[0026] In one embodiment, obtaining the corresponding judgment parameters based on the operating stage of the hydraulic retarder further includes:

[0027] When the hydraulic retarder is in the exit phase, the time from when the hydraulic retarder receives the exit braking request command to when the oil pressure in the working chamber of the hydraulic retarder drops to zero is obtained, so as to obtain the exit phase detection duration.

[0028] The standard duration of the exit phase is obtained by combining the external characteristics of the hydraulic retarder and the bench calibration data with the current requested braking torque percentage of the hydraulic retarder and the drive shaft speed.

[0029] In one embodiment, generating fault information for the hydraulic retarder float valve based on the judgment parameters and reference threshold includes:

[0030] A second time deviation ratio is obtained based on the detection duration of the exit phase and the standard duration of the exit phase;

[0031] The presence and severity of a fault in the float valve of the hydraulic retarder are determined based on the second time deviation ratio and the third preset reference threshold.

[0032] In one embodiment, obtaining the second time deviation ratio based on the exit phase detection duration and the exit phase standard duration includes:

[0033] Obtain a second difference between the exit phase detection duration and the exit phase standard duration;

[0034] The ratio of the second difference to the standard duration of the exit phase is determined as the second time deviation ratio.

[0035] Secondly, this application also provides a fault diagnosis device for a hydraulic retarder float valve, the device comprising:

[0036] The first acquisition module is used to acquire the operating stage of the hydraulic retarder, wherein the hydraulic retarder includes a start-up stage, a working stage and an exit stage.

[0037] The second acquisition module acquires corresponding judgment parameters and reference thresholds based on the operating stage of the hydraulic retarder. The judgment parameters corresponding to the start-up stage include the start-up stage detection duration and the start-up stage standard duration. The judgment parameters corresponding to the exit stage include the exit stage detection duration and the exit stage standard duration. The judgment parameters corresponding to the working stage include the initial filling rate and the end filling rate of the working chamber of the hydraulic retarder under the working stage.

[0038] The determination module is used to determine the fault information of the hydraulic retarder float valve based on the judgment parameters and reference thresholds.

[0039] 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 implement the steps of the hydraulic retarder float valve fault diagnosis method as described in any of the preceding claims.

[0040] 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, implements the steps of the hydraulic retarder float valve fault diagnosis method as described in any of the preceding claims.

[0041] Fifthly, this application also provides a computer program product. The computer program product includes a computer program that, when executed by a processor, implements the steps of the hydraulic retarder float valve fault diagnosis method as described in any of the preceding claims.

[0042] The aforementioned method, apparatus, computer equipment, storage medium, and computer program product for diagnosing faults in hydraulic retarder float valves acquire the operating stage of the hydraulic retarder and obtain corresponding judgment parameters and reference thresholds based on that stage. This allows for the acquisition of corresponding judgment parameters and reference thresholds at each operating stage of the hydraulic retarder, and the determination of fault information for the hydraulic retarder float valve based on the judgment parameters and reference thresholds corresponding to the current operating stage, thus achieving fault diagnosis of the hydraulic retarder float valve. This method enables real-time fault diagnosis of the hydraulic retarder float valve, facilitating timely maintenance by users and improving driving safety. Attached Figure Description

[0043] Figure 1 This is a flowchart illustrating a fault diagnosis method for a hydraulic retarder float valve in one embodiment.

[0044] Figure 2 This is a flowchart illustrating a fault diagnosis method for a hydraulic retarder float valve in another embodiment.

[0045] Figure 3 This is a flowchart illustrating a fault diagnosis method for a hydraulic retarder float valve in another embodiment.

[0046] Figure 4 This is a flowchart illustrating a fault diagnosis method for a hydraulic retarder float valve in yet another embodiment.

[0047] Figure 5 This is a diagram illustrating the application environment of a fault diagnosis method for a hydraulic retarder float valve in one embodiment.

[0048] Figure 6 This is a schematic diagram of a fault diagnosis device for a hydraulic retarder float valve in one embodiment.

[0049] Figure 7 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0050] 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.

[0051] As described in the background section, a hydraulic retarder utilizes the damping effect of fluid flow to generate a counter-dragging braking force opposite to the positive driving force, thereby slowing down the vehicle and providing auxiliary braking. A hydraulic retarder mainly consists of core components such as a stator, rotor, sensor, proportional valve, heat exchanger, float valve, and muffler. When the hydraulic retarder is activated, hydraulic fluid enters the working chamber formed by the stator and rotor. Gas within the working chamber is discharged to the atmosphere through the float valve. When the hydraulic retarder reaches the braking torque, the float in the float valve rises under the buoyancy of the hydraulic fluid and seals the top of the float valve. When the hydraulic retarder is deactivated, hydraulic fluid enters the oil sump below the float valve, and the float loses buoyancy and falls back down. The top of the float valve separates from the sealing structure, and air re-enters the working chamber.

[0052] Because float valves need to operate for extended periods, they are considered consumable parts. Failure of the float valve seal will affect the performance of the hydraulic retarder. Therefore, the current practice is to maintain the float valve through regular maintenance. However, due to the influence of the hydraulic retarder's operating conditions, the timing of float valve failure often varies, making it difficult to maintain the float valve in a timely manner using regular maintenance.

[0053] Based on the above problems, in one embodiment, such as Figure 1 As shown, a fault diagnosis method for a hydraulic retarder float valve is provided. Taking the application of this fault diagnosis method for a vehicle as an example, the method includes the following steps S101, S102 and S103.

[0054] S101: Obtain the operating stage of the hydraulic retarder, which includes the start-up stage, working stage and exit stage.

[0055] The operation of a hydraulic retarder can be divided into three stages: startup, working, and exit. The startup stage is the stage from startup to the rated oil pressure value under the current working condition. The working stage is the stage of continuous operation where the braking torque of the hydraulic retarder is stable. The exit stage is the stage where the oil pressure in the working chamber drops to zero.

[0056] It is understandable that the hydraulic retarder operates differently during the startup, operation, and shutdown phases. Therefore, it is necessary to determine the current operating phase of the hydraulic retarder in order to perform fault diagnosis accordingly.

[0057] S102: Obtain the corresponding judgment parameters and reference thresholds according to the operating stage of the hydraulic retarder. The judgment parameters corresponding to the start-up stage include the start-up stage detection duration and the start-up stage standard duration. The judgment parameters corresponding to the exit stage include the exit stage detection duration and the exit stage standard duration. The judgment parameters corresponding to the working stage include the initial filling rate and the final filling rate inside the working chamber of the hydraulic retarder during the working stage.

[0058] It is understandable that the start-up and exit phases involve continuous changes in oil pressure within the working chamber. Therefore, the duration of these phases effectively reflects the operating status of the hydraulic retarder. However, during the operating phase, the braking torque is stable, and the operating time is uncertain. In this case, the parameter that effectively reflects the operating status of the hydraulic retarder is the filling rate within the working chamber. Therefore, the judgment parameters for the start-up phase include the start-up detection duration and the standard start-up duration; the judgment parameters for the exit phase include the exit detection duration and the standard exit duration; and the judgment parameters for the operating phase include the initial filling rate and the final filling rate within the working chamber of the hydraulic retarder during the operating phase.

[0059] S103: Determine the fault information of the hydraulic retarder float valve based on the judgment parameters and reference thresholds.

[0060] Based on the current operating conditions, the reference threshold for the current operating stage of the hydraulic retarder can be determined. Based on the judgment parameters and the reference threshold, the fault information of the hydraulic retarder float valve can be determined, thereby realizing the fault diagnosis of the hydraulic retarder float valve.

[0061] The aforementioned method for diagnosing faults in the hydraulic retarder float valve obtains the operating stage of the hydraulic retarder and corresponding judgment parameters and reference thresholds based on that stage. This allows for the acquisition of these parameters and thresholds at each operating stage, and the determination of fault information for the float valve based on the current stage's parameters and thresholds. This method enables real-time fault diagnosis of the hydraulic retarder float valve, facilitating timely maintenance and improving driving safety.

[0062] In one embodiment, obtaining the operating stage of the hydraulic retarder includes: obtaining command information received by the hydraulic retarder and the oil pressure value of the hydraulic retarder; and determining the operating stage of the hydraulic retarder based on the command information received by the hydraulic retarder and the oil pressure value of the hydraulic retarder.

[0063] The start-up phase is from the moment the hydraulic retarder receives the braking request command until the hydraulic retarder reaches the rated oil pressure value under the current operating conditions. The working phase is from the moment the rated oil pressure inside the working chamber of the hydraulic retarder reaches the moment the brake release request command is received. The exit phase is from the moment the hydraulic retarder receives the brake release request command until the oil pressure inside the working chamber drops to zero.

[0064] Understandably, based on the limitations of each operating phase, if the hydraulic retarder receives a braking request command and the hydraulic retarder has not reached the rated oil pressure value for the current operating condition, it can be determined that the hydraulic retarder is in the startup phase. If the rated oil pressure is reached inside the working chamber of the hydraulic retarder and no braking withdrawal request command is received, it can be determined that the hydraulic retarder is in the working phase. If a braking withdrawal request command is received and the oil pressure inside the working chamber has not dropped to zero, it can be determined that the hydraulic retarder is in the withdrawal phase.

[0065] In one embodiment, the corresponding judgment parameters are obtained according to the operating stage of the hydraulic retarder, including obtaining the time from when the hydraulic retarder receives the braking request command to when the hydraulic retarder reaches the rated hydraulic pressure value under the current operating condition, in the case that the hydraulic retarder is in the start-up stage, to obtain the start-up stage detection duration; and obtaining the standard duration of the start-up stage based on the external characteristics of the hydraulic retarder, bench calibration data, and the current requested braking torque percentage and drive shaft speed of the hydraulic retarder.

[0066] The standard duration of the start-up phase under different operating conditions can be stored in advance. Based on the external characteristics of the hydraulic retarder, bench calibration data, and the current requested braking torque percentage of the hydraulic retarder and the transmission shaft speed, the current operating condition can be determined, and then the corresponding standard duration of the start-up phase can be obtained based on the current operating condition.

[0067] In the application, the timing starts from the moment the braking request command is received. When the hydraulic retarder is in the start-up phase, the timing continues until the hydraulic retarder reaches the rated oil pressure value under the current operating condition. The time from when the hydraulic retarder receives the braking request command to when the hydraulic retarder reaches the rated oil pressure value under the current operating condition is obtained, which is the start-up phase detection duration.

[0068] In one embodiment, determining the fault information of the hydraulic retarder float valve based on judgment parameters and reference thresholds includes obtaining a first time deviation ratio based on the detection duration of the start-up phase and the standard duration of the start-up phase; and determining whether the float valve of the hydraulic retarder has a fault and the fault level based on the first time deviation ratio and a first preset reference threshold.

[0069] Specifically, a first time deviation ratio is obtained by comparing the detection duration during the startup phase with the standard duration of the startup phase. The relationship between this first time deviation ratio and a first preset reference threshold is used to determine if the float valve is faulty. If the first time deviation ratio is greater than the first preset reference threshold, the float valve is considered faulty. If the float valve is faulty, the fault level can be determined based on the ratio of the first time deviation ratio to the first preset reference threshold.

[0070] For example, when the first time deviation ratio k1 is between 1 and 1.2 times the first preset reference threshold, the output float valve fault level is the first fault level; if the time deviation ratio k1 is greater than 1.2 times the first preset reference threshold, the output is a second fault level that is more serious than the first fault level; if the time deviation ratio k1 is less than or equal to the first preset reference threshold, the hydraulic retarder float valve is considered to be fault-free.

[0071] In one embodiment, obtaining a first time deviation ratio based on the startup phase detection duration and the startup phase standard duration includes: obtaining a first difference between the startup phase detection duration and the startup phase standard duration; and determining the ratio of the first difference to the startup phase standard duration as the first time deviation ratio.

[0072] Let T1 represent the detection duration of the startup phase, and T2 represent the standard duration of the startup phase. The first difference ΔT1 = T1 - T2. The first time deviation ratio is obtained by calculating the first difference ΔT1 and the standard duration of the startup phase T2, specifically as the first time deviation ratio k1 = ΔT / T2 * 100%. If the first time deviation ratio k1 is greater than the first preset reference threshold, it is determined that the float valve is faulty under the current operating condition, and the fault level of the float valve is determined based on the difference between the first time deviation ratio k1 and the first preset reference threshold.

[0073] In application, fault level ranges can be preset, and the fault level is determined based on the fault level range in which the difference between the time deviation ratio k1 and the first preset reference threshold lies. For example, two fault level ranges can be preset, and the fault level is determined based on the fault level range in which the difference between the first time deviation ratio k1 and the first preset reference threshold lies. A fault level of one indicates that the hydraulic retarder needs maintenance, and a fault level of two indicates that the hydraulic retarder needs replacement.

[0074] In this application, fault information can be transmitted to the vehicle's instrument cluster control unit (ICS) via the vehicle's CAN bus. The ICS then controls the corresponding instrument cluster indicator lights to display the fault and its severity level. Different fault levels correspond to different indicator light displays. For example, different colored lights can be used to indicate the fault.

[0075] In one embodiment, the corresponding judgment parameters are obtained according to the operating stage of the hydraulic retarder, including: when the hydraulic retarder is in the working stage, obtaining the initial filling rate inside the working chamber of the hydraulic retarder at the beginning of the working stage and the final filling rate inside the working chamber of the hydraulic retarder at the end of the working stage.

[0076] In application, the filling rate inside the working chamber of the hydraulic retarder can be monitored in real time. The filling rates q1 and q2 at the initial moment when the braking torque stabilizes and at the end of the hydraulic retarder's working phase can be obtained. The fluctuation deviation of the filling rate at the initial and end moments of the hydraulic retarder's working phase, Δq = q2 - q1, can be calculated. It can be understood that under normal conditions, the filling rate at the end of the working phase should be less than the filling rate at the initial moment, and the fluctuation deviation should be small. Therefore, if the filling rate deviation Δq is less than the corresponding set reference threshold, a fault in the float valve can be determined.

[0077] In one embodiment, determining the fault information of the hydraulic retarder float valve based on judgment parameters and reference thresholds includes: obtaining the difference between the final filling rate and the initial filling rate; and determining whether the hydraulic retarder float valve has a fault and the fault level based on the filling rate difference and a second preset reference threshold.

[0078] The difference between the final filling rate and the initial filling rate is the filling rate fluctuation deviation Δq in the aforementioned embodiment. If the filling rate difference Δq is less than the second preset reference threshold, it can be determined that the float valve is faulty. In addition, the fault level can be determined based on the preset fault level range in which the filling rate difference falls.

[0079] It should be noted that both Δq and the second preset reference threshold are negative values.

[0080] For example, if the filling rate deviation Δq is greater than 1.2 times the second preset reference threshold when the float valve is faulty, a first fault level is output; if the filling rate deviation Δq is less than 1.2 times the second preset reference threshold, a second fault level that is more serious than the first fault level is output.

[0081] In one embodiment, obtaining the corresponding judgment parameters based on the operating stage of the hydraulic retarder further includes: when the hydraulic retarder is in the exit stage, obtaining the time from when the hydraulic retarder receives the exit braking request command to when the oil pressure in the hydraulic retarder working chamber drops to zero, so as to obtain the exit stage detection duration; and obtaining the standard duration of the exit stage based on the external characteristics of the hydraulic retarder and the bench calibration data, combined with the current requested braking torque percentage of the hydraulic retarder and the drive shaft speed.

[0082] The standard duration of the exit phase under different operating conditions can be stored in advance. Based on the external characteristics of the hydraulic retarder, bench calibration data, and the current requested braking torque percentage of the hydraulic retarder and the transmission shaft speed, the current operating condition can be determined, and then the corresponding standard duration of the exit phase can be obtained based on the current operating condition.

[0083] In the application, timing begins from the moment the brake release request command is received. When the hydraulic retarder is in the exit phase, the timing continues until the oil pressure in the hydraulic retarder's working chamber drops to zero. The time from when the hydraulic retarder receives the brake release request command to when the oil pressure in the hydraulic retarder's working chamber drops to zero is obtained, which is the exit phase detection duration.

[0084] In one embodiment, generating fault information for the hydraulic retarder float valve based on judgment parameters and a reference threshold includes: obtaining a second time deviation ratio based on the exit phase detection duration and the exit phase standard duration; and determining whether the hydraulic retarder float valve has a fault and the fault level based on the second time deviation ratio and a third preset reference threshold.

[0085] Specifically, a second time deviation ratio is obtained based on the detection duration of the exit phase and the standard duration of the exit phase. The relationship between this second time deviation ratio and a second preset reference threshold is used to determine whether the float valve is faulty. If the second time deviation ratio is greater than the second preset reference threshold, the float valve is considered faulty. If the float valve is faulty, the fault level can be determined based on the ratio of a first time deviation ratio to a first preset reference threshold.

[0086] For example, when the second time deviation ratio k2 is between 1 and 1.2 times the second preset reference threshold, the output float valve fault level is the first fault level; if the time deviation ratio k2 is greater than 1.2 times the second preset reference threshold, the output is the second fault level, which is more serious than the first fault level; if the time deviation ratio k2 is less than or equal to the second preset reference threshold, the hydraulic retarder float valve is considered to be fault-free.

[0087] In one embodiment, obtaining a second time deviation ratio based on the exit phase detection duration and the exit phase standard duration includes: obtaining a second difference between the exit phase detection duration and the exit phase standard duration; and determining the ratio of the second difference to the exit phase standard duration as the second time deviation ratio.

[0088] Let T3 represent the detection duration of the exit phase, and T4 represent the standard duration of the exit phase. The second difference ΔT2 = T4 - T3. The second time deviation ratio is obtained by calculating the second difference ΔT2 and the standard duration of the exit phase T4, specifically: second time deviation ratio k2 = ΔT2 / T4 * 100%. If the second time deviation ratio k2 is greater than the second preset reference threshold, it is determined that the float valve is faulty under the current operating condition, and the fault level of the float valve is determined based on the difference between the second time deviation ratio k2 and the second preset reference threshold.

[0089] In application, fault level ranges can be preset, and the fault level is determined based on the fault level range in which the difference between the second time deviation ratio k2 and the second preset reference threshold lies. For example, two fault level ranges can be preset, and the fault level is determined based on the fault level range in which the difference between the time deviation ratio k2 and the second preset reference threshold lies. A fault level of one indicates that the hydraulic retarder needs maintenance, and a fault level of two indicates that the hydraulic retarder needs replacement.

[0090] Based on the above embodiments, in one embodiment, this application provides a method for diagnosing faults in a hydraulic retarder float valve, such as... Figure 2 As shown, the fault diagnosis method for the float valve of the hydraulic retarder includes the following steps S201-S205.

[0091] S201: Obtain the operating stage of the hydraulic retarder;

[0092] S202: When the hydraulic retarder is in the start-up phase, obtain the time from when the hydraulic retarder receives the braking request command to when the hydraulic retarder reaches the rated oil pressure value under the current operating conditions, so as to obtain the start-up phase detection duration.

[0093] S203: Based on the external characteristics of the hydraulic retarder, bench calibration data, and the current requested braking torque percentage of the hydraulic retarder and the drive shaft speed, obtain the standard duration of the start-up phase;

[0094] S204: Obtain the first time deviation ratio based on the detection duration of the startup phase and the standard duration of the startup phase;

[0095] S205: Determine whether the float valve of the hydraulic retarder is faulty and the fault level based on the first time deviation ratio and the first preset reference threshold.

[0096] Based on the above embodiments, in another embodiment, this application provides a method for diagnosing faults in a hydraulic retarder float valve, such as... Figure 3 As shown, the fault diagnosis method for the float valve of the hydraulic retarder includes:

[0097] S301: When the hydraulic retarder is in the working phase, obtain the initial filling rate of the hydraulic retarder working chamber at the beginning of the working phase and the final filling rate of the hydraulic retarder working chamber at the end of the working phase.

[0098] S302: Obtain the difference between the final filling rate and the initial filling rate;

[0099] S303: Determine whether the float valve of the hydraulic retarder is faulty and the fault level based on the difference in filling rate and the second preset reference threshold.

[0100] Based on the above embodiments, in yet another embodiment, this application provides a method for diagnosing faults in a hydraulic retarder float valve, such as... Figure 4 As shown, the fault diagnosis method for the float valve of the hydraulic retarder includes:

[0101] S401: When the hydraulic retarder is in the exit phase, obtain the time from when the hydraulic retarder receives the exit braking request command to when the oil pressure in the hydraulic retarder working chamber drops to zero, so as to obtain the exit phase detection duration.

[0102] S402: Based on the external characteristics of the hydraulic retarder and the bench calibration data, combined with the current requested braking torque percentage of the hydraulic retarder and the drive shaft speed, obtain the standard duration of the exit phase;

[0103] S403: Obtain the second time deviation ratio based on the exit phase detection duration and the standard exit phase duration;

[0104] S404: Determine whether the float valve of the hydraulic retarder is faulty and the fault level based on the second time deviation ratio and the third preset reference threshold.

[0105] It should be understood that although the steps in the flowcharts of the above embodiments 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 above embodiments 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.

[0106] In applications, such as Figure 5As shown, the above-described fault diagnosis method for the hydraulic retarder float valve can be applied to the hydraulic buffer control unit. The hydraulic buffer control unit is connected to the oil pressure sensor, filling rate acquisition calculator, timer, and speed sensor within the hydraulic buffer to obtain the parameters collected by each sensor and the recording time of the timer. Based on the acquired data, the steps of the fault diagnosis method for the hydraulic retarder float valve in the above embodiment are implemented. The hydraulic buffer control unit is also connected to the CAN bus, which can transmit fault information to the vehicle's instrument control unit. The vehicle's instrument control unit controls the corresponding instrument indicator lights to indicate the fault and fault level based on the received fault information. Different fault levels correspond to different instrument indicator light indication methods. For example, different colored lights can be used to indicate fault information.

[0107] Based on the same inventive concept, this application also provides a hydraulic retarder float valve fault diagnosis device for implementing the above-mentioned hydraulic retarder float valve fault diagnosis method. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations of one or more hydraulic retarder float valve fault diagnosis device embodiments provided below can be found in the limitations of the hydraulic retarder float valve fault diagnosis method described above, and will not be repeated here.

[0108] This application also provides a fault diagnosis device for a hydraulic retarder float valve, such as... Figure 6 As shown, the hydraulic retarder float valve fault diagnosis device 600 includes: a first acquisition module 601, a second acquisition module 602, and a determination module 603, wherein:

[0109] The first acquisition module 601 is used to acquire the operating stage of the hydraulic retarder, wherein the hydraulic retarder includes a start-up stage, a working stage and an exit stage.

[0110] The second acquisition module 602 is used to acquire corresponding judgment parameters and reference thresholds according to the operating stage of the hydraulic retarder. The judgment parameters corresponding to the start-up stage include the start-up stage detection duration and the start-up stage standard duration. The judgment parameters corresponding to the exit stage include the exit stage detection duration and the exit stage standard duration. The judgment parameters corresponding to the working stage include the initial filling rate and the end filling rate inside the working chamber of the hydraulic retarder during the working stage.

[0111] The determination module 603 is used to determine the fault information of the hydraulic retarder float valve based on the judgment parameters and reference thresholds.

[0112] In one embodiment, the first acquisition module 601 is further configured to acquire the command information received by the hydraulic retarder and the oil pressure value of the hydraulic retarder; determine the operating stage of the hydraulic retarder based on the command information received by the hydraulic retarder and the oil pressure value of the hydraulic retarder, wherein the start-up stage is the stage from the hydraulic retarder receiving the braking request command to the hydraulic retarder reaching the rated oil pressure value of the current operating condition, the working stage is the stage from the hydraulic retarder reaching the rated oil pressure inside the working chamber to receiving the exit braking request command, and the exit stage is the stage from the hydraulic retarder receiving the exit braking request command to the oil pressure in the working chamber dropping to zero.

[0113] In one embodiment, the second acquisition module 602 is further configured to acquire the time from when the hydraulic retarder receives a braking request command to when the hydraulic retarder reaches the rated hydraulic pressure value under the current operating condition, in the case that the hydraulic retarder is in the start-up phase, so as to acquire the start-up phase detection duration; and acquire the standard start-up phase duration based on the external characteristics of the hydraulic retarder, bench calibration data, and the percentage of the current requested braking torque of the hydraulic retarder and the drive shaft speed.

[0114] In one embodiment, the determining module 603 is further configured to obtain a first time deviation ratio based on the detection duration of the start-up phase and the standard duration of the start-up phase; and to determine whether the float valve of the hydraulic retarder is faulty and the fault level based on the first time deviation ratio and a first preset reference threshold.

[0115] In one embodiment, the determining module 603 is further configured to obtain a first difference between the detection duration of the startup phase and the standard duration of the startup phase; and to determine the ratio of the first difference to the standard duration of the startup phase as a first time deviation ratio.

[0116] In one embodiment, the second acquisition module 602 is further configured to acquire, when the hydraulic retarder is in the working phase, the initial filling rate inside the working chamber of the hydraulic retarder at the beginning of the working phase and the final filling rate inside the working chamber of the hydraulic retarder at the end of the working phase.

[0117] In one embodiment, the determining module 603 is further configured to obtain the difference between the final filling rate and the initial filling rate; and to determine whether the float valve of the hydraulic retarder is faulty and the fault level based on the difference in filling rate and a second preset reference threshold.

[0118] In one embodiment, the second acquisition module 602 is further configured to acquire the time from when the hydraulic retarder receives the brake withdrawal request command to when the hydraulic retarder's working chamber pressure drops to zero, in the case that the hydraulic retarder is in the withdrawal phase, so as to acquire the withdrawal phase detection duration; and to acquire the standard withdrawal phase duration based on the hydraulic retarder's external characteristics and bench calibration data, combined with the percentage of the hydraulic retarder's current requested braking torque and the drive shaft speed.

[0119] In one embodiment, the determining module 603 is further configured to obtain a second time deviation ratio based on the exit phase detection duration and the exit phase standard duration; and to determine whether the float valve of the hydraulic retarder is faulty and the fault level based on the second time deviation ratio and a third preset reference threshold.

[0120] In one embodiment, the determining module 603 is further configured to obtain a second difference between the exit phase detection duration and the exit phase standard duration; and to determine the ratio of the second difference to the exit phase standard duration as a second time deviation ratio.

[0121] Each module in the aforementioned hydraulic retarder float valve fault diagnosis device 600 can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0122] In one embodiment, this application also provides a computer device. The computer device includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steps of the hydraulic retarder float valve fault diagnosis method as described in the above embodiment.

[0123] The computer device can be a terminal, and its internal structure diagram can be as follows: Figure 7As shown, the computer device includes a processor, memory, input / output interface, communication interface, display unit, and input device. The processor, memory, and input / output interface 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 interface. 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 in the non-volatile storage media. The input / output interface is 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 executed by the processor, the computer program implements a fault diagnosis method for a hydraulic retarder float valve. The display unit is used to form a visually visible image and can be a display screen, projection device, or 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.

[0124] Those skilled in the art will understand that Figure 7 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.

[0125] In one embodiment, 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, implements the steps of the hydraulic retarder float valve fault diagnosis method as described in the above embodiment.

[0126] In one embodiment, this application also provides a computer program product. The computer program product includes a computer program that, when executed by a processor, implements the steps of the hydraulic retarder float valve fault diagnosis method as described in the above embodiment.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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 method for diagnosing faults in a hydraulic retarder float valve, characterized in that, The method includes: The operating stage of the hydraulic retarder is determined, wherein the hydraulic retarder includes a start-up stage, a working stage, and an exit stage; According to the operating stage of the hydraulic retarder, the corresponding judgment parameters and reference thresholds are obtained. The judgment parameters corresponding to the start-up stage include the start-up stage detection duration and the start-up stage standard duration. The judgment parameters corresponding to the exit stage include the exit stage detection duration and the exit stage standard duration. The judgment parameters corresponding to the working stage include the initial filling rate and the end filling rate of the working chamber of the hydraulic retarder under the working stage. The fault information of the hydraulic retarder float valve is determined based on the judgment parameters and reference thresholds.

2. The method for diagnosing faults in a hydraulic retarder float valve according to claim 1, characterized in that, The process of determining the operating stage of the hydraulic retarder includes: Obtain the command information received by the hydraulic retarder and the oil pressure value of the hydraulic retarder; The operating stage of the hydraulic retarder is determined based on the command information received by the hydraulic retarder and the hydraulic pressure value of the hydraulic retarder. The start-up stage is from the time the hydraulic retarder receives the braking request command to the time the hydraulic retarder reaches the rated hydraulic pressure value under the current operating condition. The working stage is from the time the rated hydraulic pressure inside the working chamber of the hydraulic retarder is reached to the time the brake withdrawal request command is received. The withdrawal stage is from the time the hydraulic retarder receives the brake withdrawal request command to the time the hydraulic pressure in the working chamber drops to zero.

3. The method for diagnosing faults in a hydraulic retarder float valve according to claim 2, characterized in that, The step of obtaining the corresponding judgment parameters based on the operating stage of the hydraulic retarder includes: When the hydraulic retarder is in the start-up phase, the time from when the hydraulic retarder receives the braking request command to when the hydraulic retarder reaches the rated oil pressure value under the current operating condition is obtained, so as to obtain the start-up phase detection duration. The standard duration of the start-up phase is obtained based on the external characteristics of the hydraulic retarder, bench calibration data, the current requested braking torque percentage of the hydraulic retarder, and the drive shaft speed.

4. The method for diagnosing faults in a hydraulic retarder float valve according to claim 3, characterized in that, The step of determining the fault information of the hydraulic retarder float valve based on the judgment parameters and reference thresholds includes: A first time deviation ratio is obtained based on the detection duration of the startup phase and the standard duration of the startup phase. The presence and severity of a fault in the float valve of the hydraulic retarder are determined based on the first time deviation ratio and the first preset reference threshold.

5. The method for diagnosing faults in a hydraulic retarder float valve according to claim 4, characterized in that, The step of obtaining the first time deviation ratio based on the detection duration of the startup phase and the standard duration of the startup phase includes: Obtain the first difference between the detection duration of the startup phase and the standard duration of the startup phase; The ratio of the first difference to the standard duration of the startup phase is determined as the first time deviation ratio.

6. The method for diagnosing faults in a hydraulic retarder float valve according to claim 2, characterized in that, The step of obtaining the corresponding judgment parameters based on the operating stage of the hydraulic retarder includes: When the hydraulic retarder is in the working phase, the initial filling rate of the hydraulic retarder working chamber at the beginning of the working phase and the final filling rate of the hydraulic retarder working chamber at the end of the working phase are obtained.

7. The method for diagnosing faults in a hydraulic retarder float valve according to claim 6, characterized in that, The step of determining the fault information of the hydraulic retarder float valve based on the judgment parameters and reference thresholds includes: Obtain the difference between the final filling rate and the initial filling rate; The presence and severity of a fault in the float valve of the hydraulic retarder are determined based on the difference in filling rate and the second preset reference threshold.

8. The method for diagnosing faults in a hydraulic retarder float valve according to claim 2, characterized in that, The step of obtaining the corresponding judgment parameters based on the operating stage of the hydraulic retarder also includes: When the hydraulic retarder is in the exit phase, the time from when the hydraulic retarder receives the exit braking request command to when the oil pressure in the hydraulic retarder working chamber drops to zero is obtained to obtain the exit phase detection duration. The standard duration of the exit phase is obtained by combining the external characteristics of the hydraulic retarder and the bench calibration data with the current requested braking torque percentage of the hydraulic retarder and the drive shaft speed.

9. The method for diagnosing faults in a hydraulic retarder float valve according to claim 8, characterized in that, The step of generating fault information for the hydraulic retarder float valve based on the judgment parameters and reference thresholds includes: A second time deviation ratio is obtained based on the detection duration of the exit phase and the standard duration of the exit phase; The presence and severity of a fault in the float valve of the hydraulic retarder are determined based on the second time deviation ratio and the third preset reference threshold.

10. The method for diagnosing faults in a hydraulic retarder float valve according to claim 9, characterized in that, The step of obtaining the second time deviation ratio based on the exit phase detection duration and the exit phase standard duration includes: Obtain a second difference between the exit phase detection duration and the exit phase standard duration; The ratio of the second difference to the standard duration of the exit phase is determined as the second time deviation ratio.

11. A fault diagnosis device for a hydraulic retarder float valve, characterized in that, The device includes: The first acquisition module is used to acquire the operating stage of the hydraulic retarder, wherein the hydraulic retarder includes a start-up stage, a working stage and an exit stage. The second acquisition module is used to acquire corresponding judgment parameters and reference thresholds according to the operating stage of the hydraulic retarder. The judgment parameters corresponding to the start-up stage include the start-up stage detection duration and the start-up stage standard duration. The judgment parameters corresponding to the exit stage include the exit stage detection duration and the exit stage standard duration. The judgment parameters corresponding to the working stage include the initial filling rate and the end filling rate of the working chamber of the hydraulic retarder under the working stage. The determination module is used to determine the fault information of the hydraulic retarder float valve based on the judgment parameters and reference thresholds.

12. 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 method according to any one of claims 1 to 10.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 10.

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