Fault detection method and system for hydraulic retarder in vehicle and vehicle

Abstract

The invention discloses a fault detection method and system for a hydraulic retarder in a vehicle and the vehicle. The vehicle comprises the hydraulic retarder and the transmission, and the hydraulic retarder and the transmission are used for providing braking force for the vehicle. The method comprises the steps that current liquid filling information and first rotating speed information of the hydraulic retarder are obtained; based on the current liquid filling information and the first rotating speed information, the current braking torque of the hydraulic retarder is determined; in response to the situation that the current braking torque is smaller than the braking torque threshold value, the hydraulic retarder is detected based on the current liquid filling information, and a first fault detection result is obtained; and in response to the first fault detection result that the hydraulic retarder is not in the internal fault state, the hydraulic retarder is detected based on the first rotating speed information and second rotating speed information of the transmission, and a second fault detection result is obtained. The technical problem that the fault determination accuracy of the hydraulic retarder in the vehicle is low is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular, to a method, a system, and a vehicle for detecting faults of a hydraulic retarder in a vehicle. Background Art

[0002] Currently, a hydraulic retarder can be used as an auxiliary braking system in situations where a vehicle needs to brake for a long time, such as when driving downhill or under heavy load. By using the flow resistance of a liquid (such as oil), the kinetic energy generated when the vehicle goes downhill, decelerates, or stops is absorbed, thereby achieving the effect of controlling the vehicle to decelerate. Ensuring the safe operation of the hydraulic retarder can reduce the burden on the vehicle's braking system, avoid brake overheating and failure, and improve driving safety. Therefore, in order to ensure the safe driving of the vehicle, it is necessary to accurately detect faults of the hydraulic retarder.

[0003] In the related art, fault detection of a hydraulic retarder in a vehicle usually adopts fault detection based on fuzzy theory. By converting data during vehicle driving (such as rotational speed data, temperature data, pressure data, driving behavior data, etc.) into fuzzy patterns. For example, assuming that the measurement range of the working temperature of the hydraulic retarder in the vehicle is from 0°C to 120°C, it can be divided into four fuzzy patterns: cold (0° - 30°C), moderate (30° - 60°C), hot (60° - 90°C), overheat (90°C - 120°C). By dividing the working temperature into fuzzy patterns, it is determined whether the hydraulic retarder has a fault. However, the above method has a strong dependence on experience during the detection process, and it is impossible to accurately locate the fault of the hydraulic retarder, nor can it accurately judge the cause of the fault of the hydraulic retarder. Therefore, there is still a technical problem of low accuracy in determining faults of the hydraulic retarder in a vehicle.

[0004] In view of the above technical problem of low accuracy in determining faults of the hydraulic retarder in a vehicle, no effective solution has been proposed yet. Summary of the Invention

[0005] Embodiments of the present invention provide a method, a system, and a vehicle for detecting faults of a hydraulic retarder in a vehicle, so as to at least solve the technical problem of low accuracy in determining faults of the hydraulic retarder in a vehicle.

[0006] According to one aspect of an embodiment of the present invention, a method for detecting a fault of a hydraulic retarder in a vehicle is provided. The vehicle includes a hydraulic retarder and a transmission, and the hydraulic retarder and the transmission are used to provide braking force for the vehicle. The method may include: obtaining current filling information and first rotational speed information of the hydraulic retarder, where the current filling information is used to represent the content of the liquid currently filled in the hydraulic retarder, and the first rotational speed information is used to represent the rotational speed of the transmission received by the hydraulic retarder; determining the current braking torque of the hydraulic retarder based on the current filling information and the first rotational speed information; in response to the current braking torque being less than a braking torque threshold, detecting the hydraulic retarder based on the current filling information to obtain a first fault detection result; in response to the first fault detection result indicating that the hydraulic retarder is not in an internal fault state, detecting the hydraulic retarder based on the first rotational speed information and second rotational speed information of the transmission to obtain a second fault detection result, where the second rotational speed information is used to represent the rotational speed output by the transmission to the hydraulic retarder, and the second fault detection result is used to indicate whether the hydraulic retarder is in an external fault state.

[0007] Optionally, in response to the current braking torque being less than the braking torque threshold, detecting the hydraulic retarder based on the current filling information to obtain a first fault detection result, including: in response to the current braking torque being less than the braking torque threshold, detecting the hydraulic retarder based on the current filling information and a filling information threshold of the hydraulic retarder to obtain a first fault detection result.

[0008] Optionally, in response to the current braking torque being less than the braking torque threshold, detecting the hydraulic retarder based on the current filling information and a filling information threshold of the hydraulic retarder to obtain a first fault detection result, including: in response to the current braking torque being less than the braking torque threshold and the current filling information being less than the filling information threshold, determining that the first fault detection result is that the hydraulic buffer is in an internal fault state; in response to the current braking torque being less than the braking torque threshold and the current filling information being greater than or equal to the filling information threshold, determining that the first fault detection result is that the hydraulic buffer is not in an internal fault state.

[0009] Optionally, in response to the first fault detection result indicating that the hydraulic retarder is not in an internal fault state, detecting the hydraulic retarder based on the first rotational speed information and second rotational speed information of the transmission to obtain a second fault detection result: in response to the first fault detection result indicating that the hydraulic retarder is not in an internal fault state and the speed ratio between the first rotational speed information and the second rotational speed information not satisfying a speed ratio threshold, determining that the second fault detection result is that the hydraulic retarder is in an external fault state; in response to the first fault detection result indicating that the hydraulic retarder is not in an internal fault state and the speed ratio between the first rotational speed information and the second rotational speed information satisfying the speed ratio threshold, determining that the second fault detection result is that the hydraulic retarder is not in an external fault state.

[0010] Optionally, the method further includes: in response to an external fault state being triggered by a synchronizer of a transmission in a fault state, acquiring current displacement information of the synchronizer; and determining a fault type of the synchronizer based on the current displacement information.

[0011] Optionally, the fault types include an engagement fault type, a gear disengagement fault type, and a brush ring fault type. Determining the fault type of the synchronizer based on the current displacement information includes: in response to the current displacement information being less than a displacement information threshold, determining that the fault type of the synchronizer is the engagement fault type or the gear disengagement fault type; and in response to the current displacement information being greater than the displacement information threshold, determining that the fault type of the synchronizer is the brush ring fault type.

[0012] Optionally, the vehicle further includes a graphical user interface, and the method further includes: in response to a first fault detection result indicating that the hydraulic retarder is in an internal fault state, displaying the first fault detection result on the graphical user interface; and in response to the first fault detection result indicating that the hydraulic retarder is not in an internal fault state and a second fault detection result indicating that the hydraulic retarder is in an external fault state, displaying the second fault detection result on the graphical user interface.

[0013] According to one aspect of an embodiment of the present invention, there is provided a fault detection system for a hydraulic retarder in a vehicle, including: a retarder speed sensor configured to acquire first speed information of the hydraulic retarder of the vehicle, where the first speed information is used to represent a rotational speed received by the hydraulic retarder from a transmission of the vehicle; a transmission speed sensor configured to acquire second speed information of the transmission, where the second speed information is used to represent a rotational speed output by the transmission to the hydraulic retarder; a retarder control module configured to acquire current filling information of the hydraulic retarder, where the current filling information is used to represent a content of a liquid currently filled in the hydraulic retarder; and determining a current braking torque of the hydraulic retarder based on the current filling information and the first speed information; in response to the current braking torque being less than a braking torque threshold, detecting the hydraulic retarder based on the current filling information to obtain a first fault detection result; and in response to the first fault detection result indicating that the hydraulic retarder is not in an internal fault state, detecting the hydraulic retarder based on the first speed information and the second speed information to obtain a second fault detection result, where the second fault detection result is used to represent whether the hydraulic retarder is in an external fault state.

[0014] Optionally, the system may further include: a graphical user interface for displaying the first fault detection result in response to the first fault detection result indicating that the hydraulic retarder is in an internal fault state; and displaying the second fault detection result in response to the first fault detection result indicating that the hydraulic retarder is not in an internal fault state and the second fault detection result indicating that the hydraulic retarder is in an external fault state; a synchronizer displacement sensor for obtaining the current displacement information of the synchronizer in response to the external fault state being triggered by the synchronizer of the transmission in a fault state, wherein the retarder control module is configured to determine that the fault type is a combination fault type or a gear shift out fault type in response to the current displacement information being less than the displacement information threshold; and determine that the fault type is a brush ring fault type in response to the current displacement information being greater than the displacement information threshold.

[0015] According to another aspect of the embodiments of the present invention, there is also provided a fault detection device for a hydraulic retarder in a vehicle. The device may include: an acquisition unit for acquiring the current liquid filling information and the first rotational speed information of the hydraulic retarder, wherein the current liquid filling information is used to represent the content of the liquid currently filled in the hydraulic retarder, and the first rotational speed information is used to represent the rotational speed of the transmission received by the hydraulic retarder; a determination unit for determining the current braking torque of the hydraulic retarder based on the current liquid filling information and the first rotational speed information; a first detection unit for detecting the hydraulic retarder based on the current liquid filling information in response to the current braking torque being less than the braking torque threshold to obtain a first fault detection result; and a second detection unit for detecting the hydraulic retarder based on the first rotational speed information and the second rotational speed information of the transmission in response to the first fault detection result indicating that the hydraulic retarder is not in an internal fault state to obtain a second fault detection result, wherein the second rotational speed information is used to represent the rotational speed output by the transmission to the hydraulic retarder, and the second fault detection result is used to represent whether the hydraulic retarder is in an external fault state.

[0016] According to another aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium. The computer-readable storage medium includes a stored program, wherein when the program runs, it controls the device where the computer-readable storage medium is located to execute the fault detection method for the hydraulic retarder in the vehicle according to the embodiments of the present invention.

[0017] According to another aspect of the embodiments of the present invention, there is also provided a processor. The processor is used to run a program, wherein when the program runs, it executes the fault detection method for the hydraulic retarder in the vehicle according to the embodiments of the present invention.

[0018] According to another aspect of the embodiments of the present invention, there is also provided a computer program product. The computer program product includes a computer program, and when the computer program is executed by a processor, it implements the fault detection method for the hydraulic retarder in the vehicle in the above embodiments of the present application.

[0019] In an embodiment of the present invention, if it is necessary to perform a fault determination on a hydraulic retarder in a vehicle, the current braking torque of the hydraulic retarder under current conditions can be determined by the current liquid filling information of the hydraulic retarder and the rotational speed of the transmission received by the hydraulic retarder (the first rotational speed information). If the current braking torque is lower than a preset braking torque threshold, it means that the braking performance of the hydraulic retarder has decreased and it cannot provide the expected braking effect corresponding to the braking torque threshold. Then, based on the current liquid filling information, the hydraulic retarder can be detected to determine whether the hydraulic retarder is in an internal fault state. If the hydraulic retarder is not in an internal fault state, it is possible to determine whether the hydraulic retarder is in an external fault state according to the first rotational speed information and the rotational speed output from the transmission to the hydraulic retarder (the second rotational speed information). Through the above steps, accurate positioning of the faults of the hydraulic retarder is achieved, so as to accurately determine the cause of the faults of the hydraulic retarder, and further achieve the technical effect of improving the accuracy of fault determination of the hydraulic retarder in the vehicle, and solve the technical problem of low accuracy of fault determination of the hydraulic retarder in the vehicle. Description of the Drawings

[0020] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0021] Figure 1 is a flowchart of a method for detecting faults of a hydraulic retarder in a vehicle according to an embodiment of the present invention;

[0022] Figure 2 is a schematic diagram of a system for detecting faults of a hydraulic retarder in a vehicle according to an embodiment of the present invention;

[0023] Figure 3 is a flowchart of a method for detecting faults of an input power-disconnected hydraulic retarder according to an embodiment of the present invention;

[0024] Figure 4 is a schematic diagram of an electrical schematic of a method for detecting faults of an input power-disconnected hydraulic retarder according to an embodiment of the present invention;

[0025] Figure 5 is a schematic diagram of a structure for detecting faults of an input power-disconnected hydraulic retarder according to an embodiment of the present invention;

[0026] Figure 6 is a schematic diagram of a device for detecting faults of a hydraulic retarder in a vehicle according to an embodiment of the present invention. Detailed Embodiments

[0027] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the scope of protection of the present invention.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0029] According to an embodiment of the present invention, an embodiment of a method for detecting faults in a hydraulic retarder in a vehicle is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that here.

[0030] Figure 1 is a flowchart of a method for detecting faults in a hydraulic retarder in a vehicle according to an embodiment of the present invention. The vehicle includes a hydraulic retarder and a transmission, and the hydraulic retarder and the transmission are used to provide braking force for the vehicle. As Figure 1 shown, the method may include the following steps:

[0031] Step S102, obtain the current liquid filling information and the first rotational speed information of the hydraulic retarder.

[0032] In the technical solution provided in step S102 of the present invention above, the vehicle may include a hydraulic retarder and a transmission, and the hydraulic retarder and the transmission may be used to provide braking force for the vehicle. The current liquid filling information may be used to represent the content of the liquid currently filled in the hydraulic retarder, and may be the current liquid filling rate, which can be represented by Q1. The first rotational speed information may be used to represent the rotational speed of the transmission received by the hydraulic retarder, and may be the input rotational speed of the hydraulic retarder, which can be represented by R1.

[0033] In this embodiment, when the hydraulic retarder is started, the power of the vehicle transmission system (such as the engine or transmission) can be guided to a liquid-filled chamber (working chamber) in a hydraulic retarder. The liquid circulates at a high speed in the working chamber, generating frictional force, and the frictional force is converted into heat energy, thereby consuming the kinetic energy of the vehicle and achieving the purpose of deceleration. The transmission is the core part of the vehicle transmission system and can adjust the torque and rotational speed output by the vehicle's engine to make the vehicle adapt to different driving conditions. In scenarios involving the provision of braking force, the transmission can increase the braking effect of the vehicle by switching to a low gear and utilizing the engine's counter-dragging effect.

[0034] Optionally, if the current liquid filling information is to be obtained, the content of the liquid currently filled in the working chamber of the hydraulic retarder can be collected through a sensor deployed inside the hydraulic retarder. If the first rotational speed information is to be obtained, it can be collected through a transmission rotational speed sensor.

[0035] It should be noted that the above methods for obtaining the current liquid filling information and the first rotational speed information are only for illustrative purposes and are not specifically limited here. As long as it is a method that can achieve obtaining the content of the liquid currently filled in the hydraulic retarder in the vehicle and the rotational speed of the transmission received by the hydraulic retarder, it is within the protection scope of the embodiments of the present invention.

[0036] In the embodiments of the present invention, by obtaining the current liquid filling information and the first rotational speed information of the hydraulic retarder, the operating state of the hydraulic retarder can be monitored in real time, providing a basis for determining the current braking torque of the subsequent hydraulic retarder.

[0037] Step S104, based on the current liquid filling information and the first rotational speed information, determine the current braking torque of the hydraulic retarder.

[0038] In the technical solution provided in step S104 of the present invention above, the current braking torque is the torque value actually generated by the hydraulic retarder for decelerating or controlling the vehicle speed under the current driving conditions of the vehicle and can be represented by T1.

[0039] In this embodiment, after obtaining the current liquid filling information and the first rotational speed information of the hydraulic retarder, the current braking torque of the hydraulic retarder can be determined based on the current liquid filling information and the first rotational speed information. The current braking torque of the hydraulic retarder is a direct manifestation of the braking effect of the hydraulic retarder. The magnitude of the current braking torque is affected by multiple factors. For example, the current liquid filling rate Q1 and the input rotational speed R1 of the hydraulic retarder. The current liquid filling rate can be used to indicate the degree of filling of the working chamber in the hydraulic retarder (such as oil). When the filling amount of the liquid in the working chamber is sufficient, it means that the hydraulic retarder can provide greater resistance, thereby generating a higher braking torque and providing a stronger braking effect. When the liquid in the working chamber is insufficient, the hydraulic transmission efficiency decreases, the braking torque will decrease, the braking effect becomes weaker, and it may even cause the hydraulic retarder to malfunction. The input rotational speed of the hydraulic retarder can be used to represent the rotational speed of the input shaft of the hydraulic retarder, which can be consistent with the rotational speed of the output shaft of the engine or transmission.

[0040] Optionally, by pre-calibrating and establishing a relationship query table including various combinations of liquid filling rates and rotational speeds, the actual braking effect of the hydraulic retarder under specific conditions can be determined quickly and accurately. That is, the current braking torque T1 of the current hydraulic retarder can be obtained by querying the pre-calibrated and established relationship query table of the current liquid filling rate Q1 and the input rotational speed R1 of the hydraulic retarder.

[0041] Step S106: In response to the current braking torque being less than the braking torque threshold, the hydraulic retarder is detected based on the current liquid filling information to obtain a first fault detection result.

[0042] In the technical solution of step S106 of the present invention above, the braking torque threshold can be the rated braking torque value of the hydraulic retarder, which can be represented by T0 (that is, the braking torque to maintain the normal operation of the hydraulic retarder). The first fault detection result can be used to determine whether the hydraulic retarder is in an internal fault state.

[0043] In this embodiment, after determining the current braking torque of the hydraulic retarder based on the current liquid filling information and the first rotational speed information, when the current braking torque is less than the braking torque threshold, the hydraulic retarder is detected based on the current liquid filling information to obtain a first fault detection result. The above braking torque threshold T0 is set based on safety and performance standards. If the current braking torque is lower than this braking torque threshold, it can be explained that the hydraulic retarder cannot provide sufficient braking force to the hydraulic retarder, thereby affecting the driving safety and braking performance of the vehicle.

[0044] Optionally, the setting of the braking torque threshold T0 can be dynamically adjusted according to different operating stages, maintenance status, or driving modes of the vehicle, or can be determined through detailed bench calibration tests or simulation calculations. It should be noted that the determination process of the above braking torque threshold T0 is only for illustrative purposes and is not specifically limited here. As long as it is a braking torque threshold that can be used to maintain the normal operation of the hydraulic retarder, it is within the protection scope of the embodiments of the present invention.

[0045] Optionally, if the current braking torque is less than the braking torque threshold, that is, T1 < T0, it can indicate that under the current filling rate Q1 of the hydraulic retarder and the input speed R1 of the hydraulic retarder, the actual braking torque (current braking torque) generated is lower than the rated braking torque value T0 of the hydraulic retarder that should be achieved by design or calibration. Then, it can be determined that the performance of the hydraulic retarder has declined or there is a fault in the hydraulic retarder. In this case, further fault detection of the hydraulic retarder can be performed based on the current filling information Q1 to determine the first fault detection result, that is, to judge whether the hydraulic retarder is in an internal fault state.

[0046] Step S108, in response to the first fault detection result that the hydraulic retarder is not in an internal fault state, detect the hydraulic retarder based on the first speed information and the second speed information of the transmission to obtain the second fault detection result.

[0047] In the technical solution provided in step S108 of the present invention above, the second speed information can be used to represent the rotational speed output by the transmission to the hydraulic retarder, which can be the transmission output speed and can be represented by R2. The second speed information can directly reflect the power flow condition from the engine to the hydraulic retarder through the transmission. The second fault detection result can be used to represent whether the hydraulic retarder is in an external fault state.

[0048] In this embodiment, if the first fault detection result is that the hydraulic retarder is not in an internal fault state, that is, the internal body of the hydraulic retarder has no fault, then the hydraulic retarder can be detected based on the first speed information and the second speed information of the transmission to judge whether the synchronizer is faulty and obtain the second fault detection result. In an input power-disconnect type hydraulic retarder, the synchronizer can control the connection and disconnection between the input shaft of the hydraulic retarder and the output shaft of the transmission to ensure that the input shaft of the hydraulic retarder and the output shaft of the transmission can be connected or disconnected at an appropriate speed ratio when needed.

[0049] Optionally, the second speed information can be obtained by installing a speed sensor on the output shaft of the transmission. The above speed sensor can monitor the rotational speed of the output shaft in real time and convert the rotational speed into an electrical signal and send it to the vehicle's electronic control system, such as the hydraulic retarder control unit. The above acquisition method of the second speed information is only for illustrative purposes and is not specifically limited here.

[0050] Optionally, according to the design of the hydraulic retarder, there is a theoretical speed ratio between the input shaft of the hydraulic retarder and the output shaft of the transmission, that is, when the hydraulic retarder is working normally, there should be a certain speed relationship between the input speed R1 of the hydraulic retarder and the output speed R2 of the transmission. Thus, based on R1 and R2, the hydraulic retarder can be detected to determine whether the hydraulic retarder is in an external fault state.

[0051] In the embodiment of the present invention, when it is confirmed that there is no fault in the internal body of the hydraulic retarder, it can be determined whether the reduction in the braking effect of the hydraulic retarder is caused by external factors (such as synchronizer failure). Through the above hierarchical fault detection steps, not only the accuracy and pertinence of the fault detection of the hydraulic retarder are improved, but also the faults existing in the hydraulic retarder can be quickly located, providing a basis for subsequent maintenance or adjustment of the hydraulic retarder in the vehicle.

[0052] In the above steps S102 to S108 of this application, if it is necessary to determine the fault of the hydraulic retarder in the vehicle, the current braking torque of the hydraulic retarder under the current conditions can be determined by the current filling information of the hydraulic retarder and the rotational speed of the transmission received by the hydraulic retarder (the first rotational speed information). If the current braking torque is lower than the preset braking torque threshold, it means that the braking performance of the hydraulic retarder has decreased and cannot provide the expected braking effect corresponding to the braking torque threshold. Then, based on the current filling information, the hydraulic retarder can be detected to determine whether the hydraulic retarder is in an internal fault state. If the hydraulic retarder is not in an internal fault state, it is possible to judge whether the hydraulic retarder is in an external fault state according to the first rotational speed information and the rotational speed output by the transmission to the hydraulic retarder (the second rotational speed information). Through the above steps, accurate positioning of the faults of the hydraulic retarder is achieved, so as to accurately judge the causes of the faults of the hydraulic retarder, and further achieve the technical effect of improving the accuracy of fault determination of the hydraulic retarder in the vehicle, and solve the technical problem of low accuracy of fault determination of the hydraulic retarder in the vehicle.

[0053] The above method of this embodiment will be further introduced below.

[0054] As an optional embodiment, in response to the current braking torque being less than the braking torque threshold, the hydraulic retarder is detected based on the current filling information to obtain a first fault detection result, including: in response to the current braking torque being less than the braking torque threshold, the hydraulic retarder is detected based on the current filling information and the filling information threshold of the hydraulic retarder to obtain a first fault detection result.

[0055] In this embodiment, when the current braking torque is less than the braking torque threshold, and based on the current liquid filling information, the hydraulic retarder is detected to obtain the first fault detection result. During this process, in the case where the current braking torque is less than the braking torque threshold, the fault detection and judgment mode of the hydraulic retarder can be enabled. Based on the current liquid filling information and the liquid filling information threshold of the hydraulic retarder, the hydraulic retarder is detected to obtain the first fault detection result, that is, it is judged whether the hydraulic retarder is in an internal fault state. The liquid filling information threshold can be the rated liquid filling rate, which can be represented by Q0.

[0056] Optionally, when it is detected that the current braking torque T1 is lower than the preset braking torque threshold T0, it means that the performance of the hydraulic retarder has deteriorated, such as abnormalities in the internal structure or function, then the fault detection and judgment mode of the hydraulic retarder will be triggered. In this fault detection and judgment mode, the current liquid filling rate Q1 is compared and analyzed with the rated liquid filling rate Q0, and the first fault detection result can be obtained, that is, it can be judged whether there is a fault inside the hydraulic retarder.

[0057] Optionally, the liquid filling information threshold can be set according to the expected braking capacity, working range, and efficiency of the hydraulic retarder when designing the hydraulic retarder, or it can be calibrated through a bench. The setting of the above liquid filling information threshold is only for illustrative purposes and is not specifically limited here.

[0058] As an alternative embodiment, in response to the current braking torque being less than the braking torque threshold, and based on the current liquid filling information and the liquid filling information threshold of the hydraulic retarder, detecting the hydraulic retarder to obtain the first fault detection result includes: in response to the current braking torque being less than the braking torque threshold and the current liquid filling information being less than the liquid filling information threshold, determining that the first fault detection result is that the hydraulic buffer is in an internal fault state; in response to the current braking torque being less than the braking torque threshold and the current liquid filling information being greater than or equal to the liquid filling information threshold, determining that the first fault detection result is that the hydraulic buffer is not in an internal fault state.

[0059] In this embodiment, when the current braking torque is less than the braking torque threshold, and based on the current liquid filling information and the liquid filling information threshold of the hydraulic retarder, the hydraulic retarder is detected to obtain the first fault detection result. If the current braking torque is less than the braking torque threshold and the current liquid filling information is less than the liquid filling information threshold, then it can be determined that the first fault detection result is that the hydraulic buffer is in an internal fault state; if the current braking torque is less than the braking torque threshold and the current liquid filling information is greater than or equal to the liquid filling information threshold, then it is determined that the first fault detection result is that the hydraulic buffer is not in an internal fault state.

[0060] Optionally, if the current liquid filling information (current liquid filling rate Q1) is lower than the liquid filling information threshold (rated liquid filling rate Q0), it indicates that there is a malfunction in the liquid filling mechanism or the oil circulation system inside the hydrodynamic retarder, resulting in insufficient oil filling. At this time, the first fault detection result can be determined as the hydrodynamic retarder being in an internal fault state. For example, there is a fault in the internal body of the hydrodynamic retarder. If, while the current braking torque T1 is still lower than the braking torque threshold T0, the current liquid filling information (current liquid filling rate Q1) exceeds the liquid filling information threshold (rated liquid filling rate Q0), it means that there may be no fault in the internal structure and oil circulation system of the hydrodynamic retarder itself. At this time, the first fault detection result can be determined as the hydrodynamic retarder not being in an internal fault state.

[0061] As an optional embodiment, in response to the first fault detection result indicating that the hydrodynamic retarder is not in an internal fault state, the hydrodynamic retarder is detected based on the first rotational speed information and the second rotational speed information of the transmission, and a second fault detection result is obtained: in response to the first fault detection result indicating that the hydrodynamic retarder is not in an internal fault state, and the speed ratio between the first rotational speed information and the second rotational speed information does not meet the speed ratio threshold, it is determined that the second fault detection result is that the hydrodynamic retarder is in an external fault state; in response to the first fault detection result indicating that the hydrodynamic retarder is not in an internal fault state, and the speed ratio between the first rotational speed information and the second rotational speed information meets the speed ratio threshold, it is determined that the second fault detection result is that the hydrodynamic retarder is not in an external fault state.

[0062] In this embodiment, in the process of obtaining the second fault detection result by detecting the hydrodynamic retarder based on the first rotational speed information and the second rotational speed information of the transmission when the first fault detection result indicates that the hydrodynamic retarder is not in an internal fault state, if the first fault detection result indicates that the hydrodynamic retarder is not in an internal fault state, and the speed ratio between the first rotational speed information and the second rotational speed information does not meet the speed ratio threshold, then it can be determined that the second fault detection result is that the hydrodynamic retarder is in an external fault state; if the first fault detection result indicates that the hydrodynamic retarder is not in an internal fault state, and the speed ratio between the first rotational speed information and the second rotational speed information meets the speed ratio threshold, then it can be determined that the second fault detection result is that the hydrodynamic retarder is not in an external fault state.

[0063] Optionally, when the hydrodynamic retarder is not in an internal fault state, by comparing whether the speed ratio between the first rotational speed information (hydrodynamic retarder input speed R1) and the second rotational speed information (transmission output speed R2) meets a preset speed ratio threshold, the external fault state of the hydrodynamic retarder can be further detected. The speed ratio threshold can be preset according to the design of the hydrodynamic retarder, the working characteristics of the vehicle's overall transmission system and the synchronizer, and can be used to determine whether the power transmission between the hydrodynamic retarder and the transmission is normal.

[0064] Optionally, when the hydraulic retarder is not in an internal fault state, if the speed ratio between the first speed information R1 and the second speed information R2 does not meet the speed ratio threshold, it means that there is a fault in the connection between the hydraulic retarder and the transmission. For example, problems such as the synchronizer not being properly engaged, gear shifting out, or wear. At this time, the second fault detection result will be determined that the hydraulic retarder is in an external fault state.

[0065] Optionally, when the hydraulic retarder is not in an internal fault state, if the speed ratio between the first speed information R1 and the second speed information R2 meets the preset speed ratio threshold, it indicates that the power transmission between the hydraulic retarder and the transmission is normal. In this case, the second fault detection result can be determined that the hydraulic retarder is not in an external fault state.

[0066] As an alternative embodiment, the method further includes: in response to the external fault state being triggered by the synchronizer of the transmission in a fault state, obtaining the current displacement information of the synchronizer; based on the current displacement information, determining the fault type of the synchronizer.

[0067] In this embodiment, if the external fault state of the hydraulic retarder is triggered by the synchronizer of the transmission being in a fault state, the current displacement information of the synchronizer can be obtained; based on the current displacement information, the fault type of the synchronizer can be determined. The current displacement information of the synchronizer can be the current displacement value of the synchronizer, which can be represented by X0.

[0068] Optionally, the current displacement value X0 of the synchronizer can be obtained by a synchronizer displacement sensor. X0 reflects the actual position of the synchronizer in the current working state, and can be used to determine whether the synchronizer is properly engaged, the degree of engagement, and whether there are problems such as excessive wear or jamming. The above-mentioned method for obtaining the current displacement value of the synchronizer is only an example, and no specific limitation is made here. As long as it can be used to obtain the current displacement information of the synchronizer and determine the fault type of the synchronizer, it is within the protection scope of the embodiments of the present invention.

[0069] As an alternative embodiment, the fault types include an engagement fault type, a gear shifting out fault type, and a brush ring fault type. Based on the current displacement information, determining the fault type of the synchronizer includes: in response to the current displacement information being less than the displacement information threshold, determining the fault type of the synchronizer as the engagement fault type or the gear shifting out fault type; in response to the current displacement information being greater than the displacement information threshold, determining the fault type of the synchronizer as the brush ring fault type.

[0070] In this embodiment, the fault types may include a combination fault type, a gear shift-out fault type, and a brush ring fault type. In the process of determining the fault type of the synchronizer based on the current displacement information, when the current displacement information is less than the displacement information threshold, the fault type of the synchronizer may be determined as the combination fault type or the gear shift-out fault type; when the current displacement information is greater than the displacement information threshold, the fault type of the synchronizer may be determined as the brush ring fault type. The displacement information threshold may be the synchronizer engagement position value X1, which is the theoretical position value when the synchronizer is correctly engaged, and can be set based on the design of the synchronizer and the input power demand of the hydraulic retarder. For illustrative purposes only, no specific limitation is made here.

[0071] Optionally, the combination fault type means that the synchronizer fails to correctly engage with the input shaft of the hydraulic retarder. The gear shift-out fault type means that the connection between the synchronizer and the input shaft of the hydraulic retarder is interrupted during operation. Both the above combination fault type and the gear shift-out fault type will result in insufficient input power of the hydraulic retarder, thus affecting the braking torque of the hydraulic retarder. The brush ring fault type can reduce the engagement efficiency of the synchronizer and also affect the braking performance of the hydraulic retarder.

[0072] Optionally, if the current displacement value X0 of the synchronizer is less than the displacement information threshold X1, it may indicate that the synchronizer may not reach the proper engagement position due to jamming, damage, or incorrect control signals, or the synchronizer is not fully engaged. In this case, the fault type of the synchronizer may be determined as the combination fault type or the gear shift-out fault type. If the current displacement value X0 of the synchronizer is greater than the displacement information threshold X1, it means that the synchronizer is over-displaced during engagement, resulting in increased wear of the contact surface between the synchronizer and the input shaft of the hydraulic retarder, forming a "brush ring", then the fault type of the synchronizer may be determined as the brush ring fault type.

[0073] As an optional embodiment, the vehicle further includes a graphical user interface, and the method further includes: in response to the first fault detection result indicating that the hydraulic retarder is in an internal fault state, displaying the first fault detection result on the graphical user interface; in response to the first fault detection result indicating that the hydraulic retarder is not in an internal fault state and the second fault detection result indicating that the hydraulic retarder is in an external fault state, displaying the second fault detection result on the graphical user interface.

[0074] In this embodiment, the vehicle may further include a graphical user interface. For example, the vehicle instrument panel can serve as an interaction interface between the vehicle and the driver and visually display the fault detection results. If the first fault detection result is that the hydraulic retarder is in an internal fault state, the first fault detection result may be displayed on the graphical user interface; if the first fault detection result is that the hydraulic retarder is not in an internal fault state and the second fault detection result is that the hydraulic retarder is in an external fault state, the second fault detection result may be displayed on the graphical user interface.

[0075] Optionally, when the first fault detection result determines that the hydraulic retarder is in an internal fault state, that is, the current braking torque is less than the braking torque threshold, and the current filling information (current filling rate Q1) is lower than the filling information threshold (rated filling rate Q0), the first fault detection result can be sent to the graphical user interface, and the graphical user interface can display corresponding internal fault prompts, such as text descriptions, fault codes, warning icons, etc., so that the driver can quickly identify and take actions.

[0076] Optionally, if the first fault detection result indicates that the hydraulic retarder is not in an internal fault state, and the second fault detection result further confirms that the hydraulic retarder is in an external fault state, such as a synchronizer fault, the second fault detection result can be sent to the graphical user interface. In this case, the graphical user interface can display external fault prompts, such as specific descriptions of the fault type and fault codes, to help the driver clarify the source of the fault.

[0077] Optionally, after a fault occurs in the hydraulic retarder, regardless of whether it is in an internal fault state or an external fault state, the hydraulic retarder control unit can send the fault information to the vehicle controller or instrument controller through the Controller Area Network (CAN) bus and prompt through the instrument (vehicle instrument), and different faults correspond to different fault codes.

[0078] In the embodiment of the present invention, if it is necessary to judge the fault of the hydraulic retarder in the vehicle, the current braking torque of the hydraulic retarder under the current conditions can be determined through the current filling information of the hydraulic retarder and the rotational speed of the transmission received by the hydraulic retarder (the first rotational speed information). If the current braking torque is lower than the preset braking torque threshold, it means that the braking performance of the hydraulic retarder has decreased and cannot provide the expected braking effect corresponding to the braking torque threshold. Then, based on the current filling information, the hydraulic retarder can be detected to determine whether the hydraulic retarder is in an internal fault state. If the hydraulic retarder is not in an internal fault state, it is possible to judge whether the hydraulic retarder is in an external fault state according to the first rotational speed information and the rotational speed output from the transmission to the hydraulic retarder (the second rotational speed information). Through the above steps, accurate positioning of the fault of the hydraulic retarder is achieved, so as to accurately judge the cause of the fault of the hydraulic retarder, and further achieve the technical effect of improving the accuracy of fault determination of the hydraulic retarder in the vehicle, and solve the technical problem of low accuracy of fault determination of the hydraulic retarder in the vehicle.

[0079] Figure 2 is a schematic diagram of a fault detection system for a hydraulic retarder in a vehicle according to an embodiment of the present invention, as Figure 2As shown, the fault detection system 200 of the hydraulic retarder in the vehicle includes: a retarder speed sensor 202, a transmission speed sensor 204, and a retarder control module 206.

[0080] The retarder speed sensor 202 is configured to obtain first speed information of the hydraulic retarder of the vehicle, where the first speed information is used to represent the rotational speed received by the hydraulic retarder from the transmission of the vehicle.

[0081] The transmission speed sensor 204 is configured to obtain second speed information of the transmission, where the second speed information is used to represent the rotational speed output by the transmission to the hydraulic retarder.

[0082] The retarder control module 206 is configured to obtain current liquid filling information of the hydraulic retarder, where the current liquid filling information is used to represent the content of the liquid currently filled in the hydraulic retarder; and based on the current liquid filling information and the first speed information, determine the current braking torque of the hydraulic retarder; in response to the current braking torque being less than the braking torque threshold, perform detection on the hydraulic retarder based on the current liquid filling information to obtain a first fault detection result; in response to the first fault detection result indicating that the hydraulic retarder is not in an internal fault state, perform detection on the hydraulic retarder based on the first speed information and the second speed information to obtain a second fault detection result, where the second fault detection result is used to represent whether the hydraulic retarder is in an external fault state.

[0083] In this embodiment, the retarder speed sensor can be used to obtain the rotational speed of the input shaft of the hydraulic retarder (first speed information R1). R1 reflects the power level directly received by the hydraulic retarder and is one of the key indicators for evaluating the working state of the hydraulic retarder. The transmission speed sensor can be used to measure the rotational speed of the output shaft of the transmission (second speed information R2). Since the hydraulic retarder is usually connected after the transmission, R2 is directly related to the driving conditions of the hydraulic retarder and is crucial for judging the external connection state of the hydraulic retarder. The retarder control module can also be referred to as the control unit, which can collect information from the sensors inside the hydraulic retarder to obtain the current liquid filling state of the hydraulic retarder (current liquid filling information Q1), and Q1 is a basic indicator of the working performance of the hydraulic retarder. Combining the first speed information R1 and the current liquid filling information Q1, the control unit can apply a pre-calibrated and established query table of the relationship between the current liquid filling rate Q1 and the input speed R1 of the hydraulic retarder to calculate the current braking torque T1 of the hydraulic retarder under the current conditions, and T1 is the core parameter for evaluating the working efficiency of the hydraulic retarder.

[0084] Optionally, when the current braking torque T1 is lower than a preset braking torque threshold T0, the control unit can initiate internal fault detection. By comparing the current liquid filling information Q1 with the liquid filling information threshold Q0, it can be determined whether there is a fault inside the hydraulic retarder. If the current liquid filling information Q1 is less than the liquid filling information threshold Q0, the first fault detection result is an internal fault state. If the first fault detection result shows that the hydraulic retarder is not in an internal fault state, the control unit then compares the speed ratio between the first speed information R1 and the second speed information with the speed ratio threshold to determine whether the hydraulic retarder is in an external fault state. For example, the synchronizer state between the transmission and the hydraulic retarder is abnormal.

[0085] In the embodiment of the present invention, through the combined action of the retarder speed sensor 202, the transmission speed sensor 204, and the retarder control module 206, the working state of the hydraulic retarder can be dynamically monitored, internal faults and external faults of the hydraulic retarder can be quickly identified and distinguished, and immediate fault information can be provided to the driver, thereby achieving the technical effect of improving the accuracy of fault determination of the hydraulic retarder in the vehicle and solving the technical problem of low accuracy of fault determination of the hydraulic retarder in the vehicle.

[0086] As an optional embodiment, the system may further include: a graphical user interface for displaying the first fault detection result in response to the first fault detection result indicating that the hydraulic retarder is in an internal fault state; displaying the second fault detection result in response to the first fault detection result indicating that the hydraulic retarder is not in an internal fault state and the second fault detection result indicating that the hydraulic retarder is in an external fault state; a synchronizer displacement sensor for obtaining the current displacement information of the synchronizer in response to the external fault state being triggered by the synchronizer of the faulty transmission, wherein the retarder control module is configured to determine the fault type as a combination fault type or a gear shift out fault type in response to the current displacement information being less than the displacement information threshold; and determining the fault type as a brush ring fault type in response to the current displacement information being greater than the displacement information threshold.

[0087] In this embodiment, the system may further include a graphical user interface, such as the vehicle instrument panel. When the retarder control module determines that the hydraulic retarder is in an internal fault state through the first fault detection, the graphical user interface can display this result, informing the driver that there may be damage or abnormality inside the hydraulic retarder, suggesting immediate safety measures be taken, and contacting the maintenance service. If the retarder control module discovers that the hydraulic retarder is in an external fault state during the second fault detection, the graphical user interface can also display this result, prompting the driver to check the external connections, especially the state of the synchronizer, to ensure normal power transmission between the hydraulic retarder and the transmission.

[0088] Optionally, the second fault detection result indicates that the synchronizer is in a fault state, and the sensor can measure and report the current displacement value X0 of the synchronizer. The current displacement value X0 of the synchronizer is the basis for detecting fault types such as engagement fault type, gear shift out fault type, or brush ring fault type. The retarder control module can determine the specific fault type of the hydraulic retarder by comparing the current displacement value X0 of the synchronizer with the displacement information threshold X1.

[0089] Optionally, if the current displacement value X0 of the synchronizer is less than the displacement information threshold X1, it means that the synchronizer fails to correctly engage with the input shaft of the hydraulic retarder, or a gear shift out occurs during operation, that is, the input power is interrupted or lost. The retarder control module can send the corresponding fault type to the graphical user interface for display to alert the driver to pay attention to the engagement state of the synchronizer.

[0090] Optionally, if the current displacement value X0 of the synchronizer is greater than the displacement information threshold X1, it means that the synchronizer is over-displaced, resulting in increased surface friction with the input shaft of the hydraulic retarder, forming a "brush ring" phenomenon, which affects the efficiency and reliability of power transmission. The retarder control module can also report this fault state to the graphical user interface for the driver to handle.

[0091] In the embodiment of the present invention, by integrating the graphical user interface and the synchronizer displacement sensor, the visualization and intelligentization of the fault detection of the vehicle's hydraulic retarder can be realized, improving the overall driving safety and vehicle maintenance efficiency, providing more intuitive and accurate vehicle status feedback for drivers and maintenance personnel, thereby ensuring the high-performance operation of the vehicle.

[0092] The technical solutions of the embodiments of the present invention will be illustrated below in conjunction with preferred embodiments.

[0093] Currently, the related detection methods for hydraulic retarders do not consider the characteristic curves of hydraulic retarders, the liquid pressure in the working chamber, etc., and only judge the synchronizer fault by detecting the synchronizer displacement, resulting in a low accuracy rate. For the internal body faults of hydraulic retarders, due to the complex structure and difficult disassembly and assembly, the detection of hydraulic retarders is inconvenient. Therefore, there is still a technical problem of low accuracy in determining the faults of hydraulic retarders in vehicles.

[0094] An embodiment of the present invention provides a fault detection method for an input power-disconnectable hydraulic retarder. By obtaining the current filling rate Q1 of the hydraulic retarder and the input speed R1 of the hydraulic retarder, the current braking torque T1 of the hydraulic retarder can be determined. If T1 < T0 (rated braking torque), it indicates that the hydraulic retarder is operating abnormally. At this time, the internal fault of the hydraulic retarder can be judged by the current filling information and the filling information threshold. If it is not an internal fault of the hydraulic retarder, the external fault (synchronizer fault) of the hydraulic retarder can be further judged by the output speed R2 of the transmission and the input speed R1 of the hydraulic retarder. Through the above parametric fault detection, not only the detection is accurate, but also the problem can be quickly located inside the retarder or in the synchronizer, thus achieving the technical effect of improving the accuracy of fault determination of the hydraulic retarder in the vehicle and solving the technical problem of low accuracy of fault determination of the hydraulic retarder in the vehicle.

[0095] The embodiments of the present invention will be further introduced below.

[0096] In the embodiments of the present invention, Figure 3 is a flowchart of a fault detection method for an input power-disconnectable hydraulic retarder according to an embodiment of the present invention, as Figure 3 shown. The method may include the following steps:

[0097] Step S301, collect the input shaft speed of the hydraulic retarder and the output shaft speed of the transmission.

[0098] In this embodiment, the first speed information (input speed R1 of the hydraulic retarder) and the second speed information (output speed R2 of the transmission) of the hydraulic retarder can be obtained.

[0099] Step S302, obtain the actual braking torque, rated braking torque, rated filling rate, and actual filling rate of the hydraulic retarder.

[0100] In this embodiment, the actual braking torque (current braking torque T1), rated braking torque (T0), rated filling rate (Q0), and actual filling rate (current filling rate Q1) of the hydraulic retarder can be obtained.

[0101] Step S303, determine whether the actual braking torque of the hydraulic retarder decreases.

[0102] In this embodiment, if the actual braking torque of the hydraulic retarder decreases, step S304 is executed.

[0103] Step S304, turn on the fault detection and judgment mode of the hydraulic retarder.

[0104] In this embodiment, if the actual braking torque of the hydraulic retarder decreases, that is, the current braking torque T1 is less than the rated braking torque T0, the hydraulic retarder fault detection and judgment mode is enabled.

[0105] Step S305: Whether there is a fault in the internal body of the hydraulic retarder.

[0106] In this embodiment, after enabling the hydraulic retarder fault detection and judgment mode, it can be determined whether there is a fault in the internal body of the hydraulic retarder. If there is a fault in the internal body of the hydraulic retarder, step S306 is executed; otherwise, step S307 is executed.

[0107] Step S306: The instrument prompts an internal fault of the hydraulic retarder.

[0108] In this embodiment, if there is a fault in the internal body of the hydraulic retarder, the instrument (vehicle instrument) can be used to prompt an internal fault of the hydraulic retarder.

[0109] Step S307: Compare the input shaft speed of the hydraulic retarder with the output shaft speed of the transmission. If the speeds of the two do not meet the speed ratio, it is determined that there is a fault in the synchronizer.

[0110] In this embodiment, if there is no fault in the internal body of the hydraulic retarder, the input speed R1 of the hydraulic retarder is compared with the output speed R2 of the transmission. If the speeds of the two do not meet the speed ratio (speed ratio threshold), it can be determined that there is an external fault in the hydraulic retarder, such as a fault in the synchronizer.

[0111] Step S308: Obtain the current displacement value X0 of the synchronizer and set the synchronizer engagement position value X1.

[0112] In this embodiment, the current displacement value X0 of the synchronizer and the synchronizer engagement position value X1 can be obtained to further determine the fault type of the synchronizer.

[0113] Step S309: Determine the size relationship between X0 and X1.

[0114] In this embodiment, the size relationship between the current displacement value X0 of the synchronizer and the synchronizer engagement position value X1 can be determined. If the current displacement value X0 of the synchronizer is less than the synchronizer engagement position value X1, step S310 is executed. If the current displacement value X0 of the synchronizer is greater than the synchronizer engagement position value X1, step S311 is executed.

[0115] Step S310: Determine that the synchronizer fails to engage properly or is out of gear.

[0116] In this embodiment, if X0 < X1, the fault type of the synchronizer is that the synchronizer fails to engage properly (engagement fault type) or is out of gear (out-of-gear fault type).

[0117] Step S311: Determine whether the synchronizer is worn and a "brush ring" fault occurs.

[0118] In this embodiment, if X0 > X1, the fault type of the synchronizer is that the synchronizer is worn and a "brush ring" fault occurs (brush ring fault type).

[0119] In an embodiment of the present invention, if it is necessary to determine the fault of the hydraulic retarder in a vehicle, the current braking torque of the hydraulic retarder under the current conditions can be determined by the current liquid filling information of the hydraulic retarder and the rotational speed of the transmission received by the hydraulic retarder (the first rotational speed information). If the current braking torque is lower than the preset braking torque threshold, it means that the braking performance of the hydraulic retarder has decreased and the expected braking effect corresponding to the braking torque threshold cannot be provided. Then, based on the current liquid filling information, the hydraulic retarder can be detected to determine whether the hydraulic retarder is in an internal fault state. If the hydraulic retarder is not in an internal fault state, it is possible to determine whether the hydraulic retarder is in an external fault state according to the first rotational speed information and the rotational speed output from the transmission to the hydraulic retarder (the second rotational speed information). Through the above steps, accurate positioning of the fault of the hydraulic retarder is achieved, so as to accurately judge the cause of the fault of the hydraulic retarder, and further achieve the technical effect of improving the accuracy of fault determination of the hydraulic retarder in the vehicle, and solve the technical problem of low accuracy of fault determination of the hydraulic retarder in the vehicle.

[0120] Figure 4 It is a schematic diagram of the electrical principle diagram of a method for detecting faults of an input power-disconnected hydraulic retarder according to an embodiment of the present invention, as Figure 4 shown, including: a control unit 401, a transmission speed sensor 402, a retarder speed sensor 403, a synchronizer shift sensor 404, a hydraulic retarder 405, a vehicle instrument 406, and a CAN bus 407.

[0121] The control unit 401 can be used to receive, process, and analyze data from each sensor, execute a fault detection algorithm, and send fault information to the vehicle instrument 406 or other control units.

[0122] The transmission speed sensor 402 can be installed near the output shaft of the transmission to monitor the output speed R2 of the transmission in real time.

[0123] The retarder speed sensor 403 can be installed on the input shaft of the hydraulic retarder to obtain the input speed R1 of the hydraulic retarder.

[0124] The synchronizer shift sensor 404 can be used to monitor the current displacement value X0 of the synchronizer to determine whether the synchronizer is correctly engaged with the input shaft and whether there is excessive wear or abnormal displacement, so as to identify whether the synchronizer is in a clutch failure type, a gear shifting failure type or a brush ring failure type.

[0125] The hydraulic retarder 405 is the core component of the entire braking system and can absorb the kinetic energy of the vehicle through hydrodynamic force to achieve a deceleration or braking effect.

[0126] The vehicle instrument panel 406 can serve as an interface between the driver and the vehicle electronic system, be used to receive the fault information sent by the control unit, and provide clear fault prompts and suggestions to the driver in the form of graphics, text or sound.

[0127] The CAN bus 407 can be used to transmit data between the control unit 401 and the vehicle instrument panel 406, the control unit 401, the transmission speed sensor 402, the retarder speed sensor 403, the synchronizer shift sensor 404, the hydraulic retarder 405, and the vehicle instrument panel 406. Through the CAN bus, the control unit 401 can quickly and reliably share the fault information to achieve system-level coordination and response.

[0128] Figure 5 It is a schematic diagram of a fault detection structure of an input power-disconnect type hydraulic retarder according to an embodiment of the present invention, as Figure 5 shown. In the figure, 1 represents the retarder speed sensor for obtaining the rotational speed of the input shaft of the retarder, and 2 represents the transmission speed sensor for obtaining the rotational speed of the output shaft of the transmission.

[0129] According to an embodiment of the present invention, a fault detection device for a hydraulic retarder in a vehicle is also provided. It should be noted that the fault detection device for the hydraulic retarder in the vehicle can be used to execute the fault detection method for the hydraulic retarder in the vehicle in the above embodiment.

[0130] Figure 6 It is a schematic diagram of a fault detection device for a hydraulic retarder in a vehicle according to an embodiment of the present invention. As Figure 6 shown, the fault detection device 600 for the hydraulic retarder in the vehicle may include: an acquisition unit 602, a determination unit 604, a first detection unit 606, and a second detection unit 608.

[0131] The acquisition unit 602 is configured to acquire the current liquid filling information and the first rotational speed information of the hydraulic retarder, where the current liquid filling information is used to represent the content of the liquid currently filled in the hydraulic retarder, and the first rotational speed information is used to represent the rotational speed of the transmission received by the hydraulic retarder.

[0132] A determination unit 604, configured to determine a current braking torque of the hydraulic retarder based on current liquid filling information and first rotational speed information.

[0133] A first detection unit 606, configured to, in response to the current braking torque being less than a braking torque threshold, detect the hydraulic retarder based on the current liquid filling information to obtain a first fault detection result.

[0134] A second detection unit 608, configured to, in response to the first fault detection result indicating that the hydraulic retarder is not in an internal fault state, detect the hydraulic retarder based on the first rotational speed information and second rotational speed information of the transmission, to obtain a second fault detection result, where the second rotational speed information is used to represent a rotational speed output by the transmission to the hydraulic retarder, and the second fault detection result is used to indicate whether the hydraulic retarder is in an external fault state.

[0135] In an embodiment of the present invention, a current liquid filling information and first rotational speed information of the hydraulic retarder are obtained by an obtaining unit 602, where the current liquid filling information is used to represent a content of liquid currently filled in the hydraulic retarder, and the first rotational speed information is used to represent a rotational speed of the transmission received by the hydraulic retarder; a current braking torque of the hydraulic retarder is determined by a determination unit 604 based on the current liquid filling information and the first rotational speed information; the hydraulic retarder is detected by a first detection unit 606 in response to the current braking torque being less than the braking torque threshold, based on the current liquid filling information, to obtain a first fault detection result; the hydraulic retarder is detected by a second detection unit 608 in response to the first fault detection result indicating that the hydraulic retarder is not in an internal fault state, based on the first rotational speed information and the second rotational speed information of the transmission, to obtain a second fault detection result, where the second rotational speed information is used to represent a rotational speed output by the transmission to the hydraulic retarder, and the second fault detection result is used to indicate whether the hydraulic retarder is in an external fault state, thereby achieving the technical effect of improving the accuracy of fault determination of the hydraulic retarder in a vehicle, and solving the technical problem of low accuracy of fault determination of the hydraulic retarder in a vehicle.

[0136] According to an embodiment of the present invention, there is also provided a computer-readable storage medium, where the storage medium includes a stored program, and the program executes the method for fault detection of a hydraulic retarder in a vehicle in the above embodiment.

[0137] According to an embodiment of the present invention, there is also provided a processor, where the processor is used to run a program, and when the program runs, it executes the method for fault detection of a hydraulic retarder in a vehicle in the above embodiment.

[0138] Embodiments of the present application also provide a computer program product. Optionally, in this embodiment, the computer program product may include a computer program, which when executed by a processor, implements the method for detecting faults of a hydraulic retarder in a vehicle according to the embodiments of the present application.

[0139] In the above embodiments of the present invention, the descriptions of the respective embodiments have their own focuses. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0140] In several embodiments provided by the present application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are merely illustrative. For example, the division of the units can be a logical function division. When implemented currently, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of the units or modules can be in electrical or other forms.

[0141] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple units. Some or all of the units can be selected according to current needs to achieve the purpose of the solution of this embodiment.

[0142] In addition, in each embodiment of the present invention, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0143] When the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes: various media such as USB flash drives, read-only memories (ROM for short), random access memories (RAM for short), external hard drives, magnetic disks, or optical discs that can store program codes.

[0144] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A fault detection method for a hydraulic retarder in a vehicle, characterized in that, The vehicle includes a hydraulic retarder and a transmission, and the hydraulic retarder and the transmission are used to provide braking force for the vehicle. The method includes: Obtaining current filling information and first rotational speed information of the hydraulic retarder, where the current filling information is used to represent the content of the liquid currently filled in the hydraulic retarder, and the first rotational speed information is used to represent the rotational speed of the transmission received by the hydraulic retarder; Determining the current braking torque of the hydraulic retarder based on the current filling information and the first rotational speed information; In response to the current braking torque being less than a braking torque threshold, detecting the hydraulic retarder based on the current filling information to obtain a first fault detection result; In response to the first fault detection result indicating that the hydraulic retarder is not in an internal fault state, detecting the hydraulic retarder based on the first rotational speed information and second rotational speed information of the transmission to obtain a second fault detection result, where the second rotational speed information is used to represent the rotational speed output by the transmission to the hydraulic retarder, and the second fault detection result is used to indicate whether the hydraulic retarder is in an external fault state.

2. The method according to claim 1, wherein In response to the current braking torque being less than the braking torque threshold, detecting the hydraulic retarder based on the current filling information to obtain a first fault detection result, including: In response to the current braking torque being less than the braking torque threshold, detecting the hydraulic retarder based on the current filling information and a filling information threshold of the hydraulic retarder to obtain the first fault detection result.

3. The method according to claim 2, wherein In response to the current braking torque being less than the braking torque threshold, detecting the hydraulic retarder based on the current filling information and a filling information threshold of the hydraulic retarder to obtain the first fault detection result, including: In response to the current braking torque being less than the braking torque threshold and the current filling information being less than the filling information threshold, determining that the first fault detection result is that the hydraulic buffer is in the internal fault state; In response to the current braking torque being less than the braking torque threshold and the current filling information being greater than or equal to the filling information threshold, determining that the first fault detection result is that the hydraulic buffer is not in the internal fault state.

4. The method according to claim 1, wherein In response to the first fault detection result indicating that the hydraulic retarder is not in an internal fault state, detecting the hydraulic retarder based on the first rotational speed information and second rotational speed information of the transmission to obtain a second fault detection result: In response to the first fault detection result indicating that the hydraulic retarder is not in the internal fault state and the speed ratio between the first rotational speed information and the second rotational speed information not meeting a speed ratio threshold, determining that the second fault detection result is that the hydraulic retarder is in the external fault state; In response to the first fault detection result indicating that the hydraulic retarder is not in the internal fault state and the speed ratio between the first speed information and the second speed information satisfies the speed ratio threshold, determine that the second fault detection result is that the hydraulic retarder is not in the external fault state.

5. The method according to claim 1, wherein The method further includes: In response to the external fault state being triggered by the synchronizer of the transmission in the fault state, obtain the current displacement information of the synchronizer; Based on the current displacement information, determine the fault type of the synchronizer.

6. The method according to claim 5, characterized in that, The fault types include a combination fault type, a gear disengagement fault type, and a brush ring fault type. Based on the current displacement information, determining the fault type of the synchronizer includes: In response to the current displacement information being less than the displacement information threshold, determine that the fault type of the synchronizer is the combination fault type or the gear disengagement fault type; In response to the current displacement information being greater than the displacement information threshold, determine that the fault type of the synchronizer is the brush ring fault type.

7. The method according to any one of claims 1 to 6, characterized in that, The vehicle further includes a graphical user interface, and the method further includes: In response to the first fault detection result indicating that the hydraulic retarder is in the internal fault state, display the first fault detection result on the graphical user interface; In response to the first fault detection result indicating that the hydraulic retarder is not in the internal fault state and the second fault detection result indicating that the hydraulic retarder is in the external fault state, display the second fault detection result on the graphical user interface.

8. A fault detection system for a hydrodynamic retarder in a vehicle, characterized in that, including: A retarder speed sensor for obtaining first speed information of the hydraulic retarder of the vehicle, where the first speed information is used to represent the rotational speed received by the hydraulic retarder from the transmission of the vehicle; A transmission speed sensor for obtaining second speed information of the transmission, where the second speed information is used to represent the rotational speed output by the transmission to the hydraulic retarder; A retarder control module for obtaining the current liquid filling information of the hydraulic retarder, where the current liquid filling information is used to represent the content of the liquid currently filled in the hydraulic retarder; and based on the current liquid filling information and the first speed information, determine the current braking torque of the hydraulic retarder; in response to the current braking torque being less than the braking torque threshold, based on the current liquid filling information, detect the hydraulic retarder to obtain a first fault detection result; in response to the first fault detection result indicating that the hydraulic retarder is not in the internal fault state, based on the first speed information and the second speed information, detect the hydraulic retarder to obtain a second fault detection result, where the second fault detection result is used to represent whether the hydraulic retarder is in the external fault state.

9. The system according to claim 8, wherein The system further includes: A graphical user interface, which is configured to display the first fault detection result in response to the first fault detection result indicating that the hydraulic retarder is in the internal fault state; and display the second fault detection result in response to the first fault detection result indicating that the hydraulic retarder is not in the internal fault state and the second fault detection result indicating that the hydraulic retarder is in the external fault state. A synchronizer displacement sensor, which is configured to obtain the current displacement information of the synchronizer in response to the external fault state being triggered by the synchronizer of the transmission in a fault state. Wherein, the retarder control module is configured to determine that the fault type of the synchronizer is a combination fault type or a gear shift-out fault type in response to the current displacement information being less than the displacement information threshold; and determine that the fault type is a brush ring fault type in response to the current displacement information being greater than the displacement information threshold.

10. A vehicle, characterized in that, For performing the method according to any one of claims 1 to 7.

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