Hydraulic retarder fault judgment method, device and vehicle

Abstract

The present invention provides a hydraulic retarder fault judgment method, device and vehicle, belonging to the technical field of hydraulic retarders, the method comprising: when the hydraulic retarder stops working, judging whether the engine speed is less than the preset engine speed; when the engine speed is less than the preset engine speed, judging whether the difference between the hydraulic retarder oil temperature and the engine water temperature is greater than a first temperature difference value, and if so, determining that the hydraulic retarder has an exhaust fault; when the engine speed is greater than or equal to the preset engine speed, judging whether the difference between the hydraulic retarder oil temperature and the engine water temperature is greater than a second temperature difference value, and if so, determining that the hydraulic retarder has an exhaust fault; the first temperature difference value is greater than the second temperature difference value. The present invention can judge whether the hydraulic retarder has an exhaust fault by judging the difference between the hydraulic retarder oil temperature and the engine water temperature, thereby improving the safety of the hydraulic retarder.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic retarders, and in particular to a hydraulic retarder fault judgment method, device and vehicle. Background Art

[0002] A hydraulic retarder, also known as a hydraulic deceleration device, is a vehicle retarder that reduces the vehicle's speed through a hydraulic device. It is a very important auxiliary braking device, especially on steep slopes. Failure of the hydraulic retarder will pose a serious safety hazard to vehicle operation. Therefore, ensuring the safety of the hydraulic retarder is very important.

[0003] The existing method for ensuring the operational safety of hydraulic retarders is to establish a retarder temperature control strategy based on the retarder's own temperature sensor thresholds. Specifically, torque limiting begins when the water temperature exceeds 100°C or the oil temperature exceeds 120°C, completely disengages when the water temperature exceeds 115°C or the oil temperature exceeds 140°C, and enters torque limiting mode when either the water or oil temperature reaches the triggering condition. However, this approach only provides temperature control for the hydraulic retarder. However, during use, the retarder's exhaust port may be incompletely vented due to oil contamination (vaporized operating oil within the retarder assembly) or external obstructions (such as tarpaulins or other foreign objects). Even when the driver has disengaged the retarder, residual air pressure within the retarder still maintains low operating torque, resulting in increased vehicle fuel consumption. This indicates a hydraulic retarder exhaust failure. Existing temperature control strategies are unable to identify this fault.

[0004] Therefore, there is an urgent need to provide a hydraulic retarder fault judgment method, device and vehicle for accurately identifying the hydraulic retarder exhaust fault to ensure the safe use of the hydraulic retarder. Summary of the Invention

[0005] In view of this, it is necessary to provide a hydraulic retarder fault judgment method, device and vehicle to solve the technical problem in the prior art that the exhaust fault of the hydraulic retarder cannot be identified only by the temperature control strategy, resulting in safety risks during the use of the hydraulic retarder.

[0006] On the one hand, in order to solve the above technical problems, the present invention provides a hydraulic retarder fault diagnosis method, comprising:

[0007] When the hydraulic retarder stops working, it is determined whether the engine speed is less than the preset engine speed;

[0008] When the engine speed is less than a preset engine speed, determining whether a difference between the hydraulic retarder oil temperature and the engine water temperature is greater than a first temperature difference value, and if so, determining that an exhaust fault exists in the hydraulic retarder;

[0009] When the engine speed is greater than or equal to a preset engine speed, it is determined whether the difference between the hydraulic retarder oil temperature and the engine water temperature is greater than a second temperature difference value. If so, it is determined that the hydraulic retarder has an exhaust fault; and the first temperature difference value is greater than the second temperature difference value.

[0010] In one possible implementation, determining whether the engine speed is less than a preset engine speed includes:

[0011] Determine whether the hydraulic retarder's exit operation time is greater than a preset exit time;

[0012] When the hydraulic retarder's exit operation time is greater than the preset exit time, it is determined whether the engine speed is less than a preset engine speed.

[0013] In one possible implementation, determining whether a difference between a hydraulic retarder oil temperature and an engine water temperature is greater than a first temperature difference, and if so, determining that an exhaust fault exists in the hydraulic retarder, includes:

[0014] When the difference between the hydraulic retarder oil temperature and the engine water temperature is greater than the first temperature difference, determining whether a duration for which the difference between the hydraulic retarder oil temperature and the engine water temperature is greater than the first temperature difference is greater than a preset duration, and if so, determining that the hydraulic retarder has an exhaust fault;

[0015] Determining whether a difference between the hydraulic retarder oil temperature and the engine water temperature is greater than a second temperature difference value, and if so, determining that an exhaust fault exists in the hydraulic retarder, including:

[0016] When the difference between the hydraulic retarder oil temperature and the engine water temperature is greater than the second temperature difference, it is determined whether a duration during which the difference between the hydraulic retarder oil temperature and the engine water temperature is greater than the second temperature difference is greater than a preset duration; if so, it is determined that an exhaust fault exists in the hydraulic retarder.

[0017] In a possible implementation, the method further includes:

[0018] When it is determined that the hydraulic retarder has an exhaust failure, pressurizing the hydraulic retarder until the pressure of the hydraulic retarder reaches a preset pressure.

[0019] In a possible implementation, the method further includes:

[0020] When the hydraulic retarder is in an operating state, determining whether the engine speed is less than an engine speed threshold;

[0021] When the engine speed is less than an engine speed threshold, obtaining a hydraulic retarder water temperature and a difference between the hydraulic retarder water temperature and the engine water temperature;

[0022] It is determined whether the hydraulic retarder water temperature is greater than a preset retarder water temperature and whether the difference between the hydraulic retarder water temperature and the engine water temperature is greater than a preset temperature difference; if so, it is determined that the hydraulic retarder has a high risk of water backflow.

[0023] In one possible implementation, determining whether the hydraulic retarder water temperature is greater than a preset retarder water temperature and whether the difference between the hydraulic retarder water temperature and the engine water temperature is greater than a preset temperature difference; and if so, determining that the hydraulic retarder has a high risk of water backflow includes:

[0024] Determining whether the hydraulic retarder water temperature is greater than a preset retarder water temperature and whether a difference between the hydraulic retarder water temperature and the engine water temperature is greater than a preset temperature difference;

[0025] If so, it is determined that the current state is the first state, and it is determined whether the duration of the first state is greater than a duration threshold. If so, it is determined that the hydraulic retarder has a high risk of backflow.

[0026] In a possible implementation, the method further includes:

[0027] The displacement of the engine is acquired, and the engine speed threshold, the preset temperature difference, and the duration threshold are determined based on the displacement.

[0028] In a possible implementation, the method further includes:

[0029] When there is a high risk of water backflow in the hydraulic retarder, the water flow rate of the cooling system is increased.

[0030] On the other hand, the present invention also provides a hydraulic retarder fault judgment device, comprising:

[0031] The engine speed judgment unit is used to judge whether the engine speed is less than the preset engine speed when the hydraulic retarder stops working;

[0032] a first exhaust fault determining unit, configured to determine, when the engine speed is less than a preset engine speed, whether a difference between the hydraulic retarder oil temperature and the engine water temperature is greater than a first temperature difference value, and if so, determine that an exhaust fault exists in the hydraulic retarder;

[0033] The second exhaust fault determination unit is used to determine whether the difference between the hydraulic retarder oil temperature and the engine water temperature is greater than a second temperature difference value when the engine speed is greater than or equal to a preset engine speed. If so, it is determined that the hydraulic retarder has an exhaust fault; the first temperature difference value is greater than the second temperature difference value.

[0034] In another aspect, the present invention further provides a vehicle, comprising a memory and a processor, wherein:

[0035] The memory is used to store programs;

[0036] The processor is coupled to the memory and is configured to execute the program stored in the memory to implement the steps of the hydraulic retarder fault judgment method described in any one of the possible implementations above.

[0037] The beneficial effects of the present invention are as follows: the hydraulic retarder fault judgment method provided by the present invention, when the hydraulic retarder stops working, utilizes the characteristic that when there is an exhaust fault in the hydraulic retarder, the hydraulic retarder exhaust is incomplete, there is still a small working torque, which causes the hydraulic retarder oil temperature to rise. By judging the difference between the hydraulic retarder oil temperature and the engine water temperature, it is possible to judge whether the hydraulic retarder has an exhaust fault, and then judge the hydraulic retarder fault, which makes up for the blind spot of the existing technology that cannot judge the hydraulic retarder fault, and improves the safety of the hydraulic retarder.

[0038] Furthermore, the present invention sets different judgment conditions according to different engine speeds, thereby improving the refinement and accuracy of exhaust fault judgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 A schematic flow chart of an embodiment of a method for determining a hydraulic retarder fault provided by the present invention;

[0041] Figure 2 For the present invention Figure 1 A flow chart of an embodiment of determining whether the engine speed is less than a preset engine speed in step S101;

[0042] Figure 3 A schematic diagram of a flow chart of an embodiment of the present invention for determining whether there is a high risk of redemption;

[0043] Figure 4 for Figure 3 A schematic flow chart of an embodiment of step S103;

[0044] Figure 5 A schematic structural diagram of an embodiment of a hydraulic retarder fault judgment device provided by the present invention;

[0045] Figure 6 This is a schematic structural diagram of an embodiment of a vehicle provided by the present invention. DETAILED DESCRIPTION

[0046] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0047] It should be understood that the schematic drawings are not drawn to scale. The flowcharts used in the present invention illustrate operations implemented according to some embodiments of the present invention. It should be understood that the operations of the flowcharts can be implemented out of sequence, and steps that have no logical contextual relationship can be reversed in order or implemented simultaneously. In addition, those skilled in the art, guided by the content of the present invention, can add one or more other operations to the flowcharts or remove one or more operations from the flowcharts. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and / or processor systems and / or microcontroller systems.

[0048] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0049] The present invention provides a hydraulic retarder fault diagnosis method, device and vehicle, which are described below respectively.

[0050] The embodiment of the present invention provides a method for determining a hydraulic retarder fault, such as Figure 1 As shown in the figure, the hydraulic retarder fault diagnosis method includes:

[0051] S101, when the hydraulic retarder stops working, determining whether the engine speed is less than a preset engine speed;

[0052] S102: When the engine speed is less than a preset engine speed, determining whether a difference between the hydraulic retarder oil temperature and the engine water temperature is greater than a first temperature difference; if so, determining that an exhaust fault exists in the hydraulic retarder;

[0053] S103. When the engine speed is greater than or equal to the preset engine speed, determine whether the difference between the hydraulic retarder oil temperature and the engine water temperature is greater than a second temperature difference value. If so, determine that the hydraulic retarder has an exhaust fault; the first temperature difference value is greater than the second temperature difference value.

[0054] It should be noted that the hydraulic retarder exiting operation in step S101 refers to the situation where the hydraulic retarder water temperature or the hydraulic retarder oil temperature is higher than a set value.

[0055] In some embodiments of the present invention, the preset engine speed is 1450 rpm to 1550 rpm, the first temperature difference is 13° C. to 17° C., and the second temperature difference is 8° C. to 12° C.

[0056] Preferably, the preset engine speed is 1500 rpm, the first temperature difference is 15°C, and the second temperature difference is 10°C.

[0057] It should be understood that the preset engine speed, the first temperature difference value and the second temperature difference value can be adjusted according to the actual application scenario and are not limited to the above specific values, which will not be described in detail here.

[0058] Compared with the prior art, the hydraulic retarder fault diagnosis method provided by the embodiment of the present invention, when the hydraulic retarder stops working, utilizes the characteristic that when there is an exhaust fault in the hydraulic retarder, the hydraulic retarder exhaust is incomplete, there is still a small working torque, and the hydraulic retarder oil temperature increases. By judging the difference between the hydraulic retarder oil temperature and the engine water temperature, it is possible to determine whether the hydraulic retarder has an exhaust fault, and further determine the hydraulic retarder fault. This makes up for the blind spot of the prior art in being unable to judge the hydraulic retarder fault, and improves the safety of the hydraulic retarder.

[0059] Furthermore, the embodiment of the present invention sets different judgment conditions for different engine speeds, thereby improving the refinement and accuracy of exhaust fault judgment.

[0060] When the hydraulic retarder just stops working, the oil temperature of the hydraulic retarder will be at a higher temperature due to the previous auxiliary braking. In order to avoid this situation from adversely affecting the judgment of the exhaust fault, in some embodiments of the present invention, such as Figure 2 As shown, the determination of whether the engine speed is less than the preset engine speed in step S101 includes:

[0061] S201, determining whether the hydraulic retarder's exit operation time is greater than a preset exit time;

[0062] S202: When the hydraulic retarder's exit operation time is greater than a preset exit time, determine whether the engine speed is less than a preset engine speed.

[0063] In the embodiment of the present invention, when the hydraulic retarder has been out of operation for longer than a preset time, the engine speed is judged to perform the following exhaust fault judgment, thereby avoiding the influence of the oil temperature when the hydraulic retarder has just been out of operation on the exhaust fault, and further improving the accuracy of the exhaust fault judgment.

[0064] In some embodiments of the present invention, the preset exit duration is 25-35 seconds.

[0065] Preferably, the preset exit time is 30S.

[0066] In actual use of the hydraulic retarder, the hydraulic retarder oil temperature may occasionally increase sharply due to special operating conditions. To avoid this situation from adversely affecting the determination of the exhaust fault, in some embodiments of the present invention, determining in step S102 whether the difference between the hydraulic retarder oil temperature and the engine water temperature is greater than a first temperature difference value, and if so, determining that the hydraulic retarder has an exhaust fault, includes:

[0067] When the difference between the hydraulic retarder oil temperature and the engine water temperature is greater than a first temperature difference, it is determined whether a duration during which the difference between the hydraulic retarder oil temperature and the engine water temperature is greater than the first temperature difference is greater than a preset duration. If so, it is determined that an exhaust fault exists in the hydraulic retarder.

[0068] In step S103, determining whether the difference between the hydraulic retarder oil temperature and the engine water temperature is greater than a second temperature difference value, and if so, determining that the hydraulic retarder has an exhaust fault, includes:

[0069] When the difference between the hydraulic retarder oil temperature and the engine water temperature is greater than the second temperature difference, it is determined whether the duration for which the difference between the hydraulic retarder oil temperature and the engine water temperature is greater than the second temperature difference is greater than a preset duration. If so, it is determined that an exhaust fault exists in the hydraulic retarder.

[0070] The embodiment of the present invention determines that the hydraulic retarder has an exhaust fault only when the difference between the hydraulic retarder oil temperature and the engine water temperature is greater than a first temperature difference value or the duration of the second temperature difference is greater than a preset duration, thereby ensuring the accuracy and reliability of the exhaust fault judgment result.

[0071] In some embodiments of the present invention, the preset duration is 55S-65S.

[0072] Preferably, the preset duration is 60S.

[0073] When an exhaust failure occurs in the hydraulic retarder, in order to ensure the normal use of the hydraulic retarder, in some embodiments of the present invention, the hydraulic retarder fault judgment method further includes:

[0074] When it is determined that the hydraulic retarder has an exhaust fault, pressure is added to the hydraulic retarder until the pressure of the hydraulic retarder reaches a preset pressure.

[0075] The embodiment of the present invention pressurizes the hydraulic retarder to completely expel the gas that has not been expelled from the hydraulic retarder, thereby avoiding the problem of working torque of the hydraulic retarder caused by residual gas pressure, and solving the exhaust failure.

[0076] It should be understood that: in order for maintenance personnel to be informed of the hydraulic retarder failure as soon as possible, when it is determined that the hydraulic retarder has an exhaust failure, this fault message must be reported and saved through the T-box, so that maintenance personnel can analyze the fault period data through the vehicle network system and provide a basis for subsequent maintenance.

[0077] In a specific embodiment of the present invention, the process of determining whether the hydraulic retarder has an exhaust fault is as follows:

[0078] When the engine speed is lower than 1500rpm and the retarder oil temperature is continuously higher than the engine water temperature by more than 15℃ within the next minute, it is determined that the retarder has an exhaust fault;

[0079] When the engine speed is higher than 1500rpm and the retarder oil temperature continues to be more than 10℃ higher than the engine water temperature within 1 minute, it is determined that the retarder has an exhaust fault.

[0080] During the actual use of the hydraulic buffer, when the engine water flow is small, the water temperature of the hydraulic retarder rises rapidly after the hydraulic retarder is activated. At this time, the water flow is small and the heat dissipation of the hydraulic retarder is slow. If the water temperature rises too high, the cooling water will vaporize, and the pressure of the cooling system will increase, causing water backflow in the auxiliary water tank. When water backflow occurs in the auxiliary water tank, the hydraulic retarder cannot work normally.

[0081] In order to identify the above faults, in some embodiments of the present invention, Figure 3 As shown, the hydraulic retarder fault judgment method also includes:

[0082] S301: When the hydraulic retarder is in operation, determining whether the engine speed is less than an engine speed threshold;

[0083] S302: When the engine speed is less than the engine speed threshold, obtaining the hydraulic retarder water temperature and the difference between the hydraulic retarder water temperature and the engine water temperature;

[0084] S303: Determine whether the hydraulic retarder water temperature is greater than the preset retarder water temperature and whether the difference between the hydraulic retarder water temperature and the engine water temperature is greater than the preset temperature difference; if so, determine that the hydraulic retarder has a high risk of water backflow.

[0085] The embodiment of the present invention utilizes the characteristic that when water backflow occurs, the water temperature of the hydraulic retarder is too high or even vaporization occurs. By comparing the difference between the water temperature of the hydraulic retarder and the water temperature of the engine, it is possible to determine whether there is a high risk of water backflow, thereby further ensuring the safety of the hydraulic retarder.

[0086] Similarly, in order to avoid misjudging the situation as a high risk of backflow when the water temperature of the hydraulic retarder rises in a short period of time due to special working conditions, in some embodiments of the present invention, for example Figure 4 As shown, step S103 includes:

[0087] S401, determining whether the hydraulic retarder water temperature is greater than a preset retarder water temperature and whether the difference between the hydraulic retarder water temperature and the engine water temperature is greater than a preset temperature difference;

[0088] S402: If yes, determine that the current state is the first state, and judge whether the duration of the first state is greater than the duration threshold; if yes, determine that the hydraulic retarder has a high risk of water backflow.

[0089] The embodiment of the present invention improves the accuracy and reliability of the judgment of the high risk of water backflow by judging the duration of the first state when the current state of the hydraulic retarder is the first state that meets the high risk of water backflow.

[0090] It should be noted that the engine speed threshold, preset temperature difference, and duration threshold may vary depending on the engine displacement, and these thresholds are crucial for determining a high risk of backflow. Therefore, in some embodiments of the present invention, the hydraulic retarder fault diagnosis method further includes:

[0091] The displacement of the engine is obtained, and an engine speed threshold, a preset temperature difference, and a duration threshold are determined based on the displacement.

[0092] In a specific embodiment of the present invention, the engine displacement is divided into two types: one is 11L or more, and the other is 11L or less. When the displacement is 11L or more, the engine speed threshold is 1450rpm-1550rpm, the preset temperature difference is 18°C-23°C, and the duration threshold is 28s-32s. When the displacement is less than 11L, the engine speed threshold is 1650rpm-1750rpm, the preset temperature difference is 13°C-17°C, and the duration threshold is 13s-17s.

[0093] Preferably, when the displacement is 11L or more, the engine speed threshold is 1500rpm, the preset temperature difference is 20°C, and the duration threshold is 30s. When the displacement is less than 11L, the engine speed threshold is 1700rpm, the preset temperature difference is 15°C, and the duration threshold is 15s.

[0094] In a specific embodiment of the present invention, the process for determining whether a hydraulic retarder has a high risk of backflow is as follows:

[0095] For engines larger than 11L, with the retarder engaged, the engine speed is below 1500rpm, the retarder water temperature is above 100°C and at least 20°C higher than the engine water temperature, and this condition persists for more than 30 seconds, the cooling system is considered to have a high risk of backflow.

[0096] For engines under 11L, with the retarder engaged and the engine speed below 1700rpm, and the retarder water temperature exceeding 100°C and at least 15°C higher than the engine water temperature for more than 15 seconds, the risk of water backflow in the cooling system is considered high.

[0097] When the hydraulic retarder has a high risk of backflow, in order to ensure the normal use of the hydraulic retarder in the future, in some embodiments of the present invention, the hydraulic retarder fault diagnosis method further includes:

[0098] When there is a high risk of water backflow in the hydraulic retarder, increase the water flow in the cooling system.

[0099] The embodiment of the present invention prevents the cooling water from being vaporized at the retarder end by increasing the water flow rate of the cooling system, thereby preventing the cooling water from flowing back, and ensuring the safety of the hydraulic retarder.

[0100] It should be noted that: in order for maintenance personnel to be informed of the hydraulic retarder failure as soon as possible, when it is determined that the hydraulic retarder has a high risk of water backflow, this fault message must be reported and saved through the T-box, so that maintenance personnel can analyze the fault period data through the vehicle network system and provide a basis for subsequent maintenance.

[0101] In summary, the embodiments of the present invention achieve accurate judgment of exhaust failure and high risk of water backflow, thereby improving the safety and reliability of the hydraulic retarder during use.

[0102] In order to better implement the hydraulic retarder fault judgment method in the embodiment of the present invention, based on the hydraulic retarder fault judgment method, the embodiment of the present invention also provides a hydraulic retarder fault judgment device, such as Figure 5 As shown, the hydraulic retarder fault judgment device 500 includes:

[0103] The engine speed determination unit 501 is used to determine whether the engine speed is less than a preset engine speed when the hydraulic retarder stops working;

[0104] A first exhaust fault determining unit 502 is configured to determine whether a difference between the hydraulic retarder oil temperature and the engine water temperature is greater than a first temperature difference value when the engine speed is less than a preset engine speed, and if so, determine that an exhaust fault exists in the hydraulic retarder;

[0105] The second exhaust fault determination unit 503 is used to determine whether the difference between the hydraulic retarder oil temperature and the engine water temperature is greater than a second temperature difference value when the engine speed is greater than or equal to the preset engine speed. If so, it is determined that there is an exhaust fault in the hydraulic retarder; the first temperature difference value is greater than the second temperature difference value.

[0106] It should be noted that the hydraulic retarder fault judgment device 500 provided in the above embodiment can implement the technical solution described in the above embodiment of the hydraulic retarder fault judgment method. The specific implementation principles or specific implementation details of the above modules or units can be found in the corresponding contents in the above embodiment of the hydraulic retarder fault judgment method, and will not be described one by one here.

[0107] like Figure 6 As shown, the present invention also provides a vehicle 600. The vehicle 600 includes a processor 601, a memory 602 and a display 603. Figure 6 Only some of the components of vehicle 600 are shown, but it should be understood that implementation of all of the shown components is not a requirement, and greater or fewer components may alternatively be implemented.

[0108] In some embodiments, the processor 601 may be a central processing unit (CPU), a microprocessor, or other data processing chip, configured to execute program codes or process data stored in the memory 602 , such as the hydraulic retarder fault determination method of the present invention.

[0109] In some embodiments of the present invention, processor 601 may be a single server or a server group. The server group may be centralized or distributed. In some embodiments, processor 601 may be local or remote. In some embodiments, processor 601 may be implemented on a cloud platform. In one embodiment, the cloud platform may include a private cloud, a public cloud, a hybrid cloud, a community cloud, a distributed cloud, an internal cloud, multiple clouds, or any combination thereof.

[0110] In some embodiments, the memory 602 may be an internal storage unit of the vehicle 600 , such as a hard drive or memory of the vehicle 600 .

[0111] Furthermore, the memory 602 may include both an internal storage unit of the vehicle 600 and an external storage device. The memory 602 is used to store application software installed in the vehicle 600 and various data.

[0112] In some embodiments, display 603 can be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, or an OLED (Organic Light-Emitting Diode) touchscreen. Display 603 is used to display information about vehicle 600 and to present a visual user interface. Components 601-603 of vehicle 600 communicate with each other via a system bus.

[0113] In some embodiments of the present invention, when the processor 601 executes the hydraulic retarder fault determination program in the memory 602, the following steps may be implemented:

[0114] When the hydraulic retarder stops working, it is determined whether the engine speed is less than the preset engine speed;

[0115] When the engine speed is less than the preset engine speed, determining whether the difference between the hydraulic retarder oil temperature and the engine water temperature is greater than a first temperature difference value, and if so, determining that the hydraulic retarder has an exhaust fault;

[0116] If the engine speed is greater than or equal to the preset engine speed, it is determined whether the difference between the hydraulic retarder oil temperature and the engine water temperature is greater than a second temperature difference value. If so, it is determined that there is an exhaust fault in the hydraulic retarder; the first temperature difference value is greater than the second temperature difference value.

[0117] It should be understood that, when the processor 601 executes the hydraulic retarder fault judgment program in the memory 602 , in addition to the above functions, it can also implement other functions. For details, please refer to the description of the corresponding method embodiment above.

[0118] Accordingly, an embodiment of the present invention further provides a computer-readable storage medium, which is used to store computer-readable programs or instructions. When the program or instructions are executed by a processor, the steps or functions of the hydraulic retarder fault judgment method provided in the above-mentioned method embodiments can be implemented.

[0119] Those skilled in the art will appreciate that all or part of the process flow of the above-described method embodiment can be implemented by instructing related hardware (such as a processor, controller, etc.) through a computer program, and the computer program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a magnetic disk, an optical disk, a read-only memory, or a random access memory.

[0120] The above is a detailed introduction to a hydraulic retarder fault diagnosis method, device and vehicle provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the ideas of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A method for determining a hydraulic retarder fault, characterized in that: include: When the hydraulic retarder stops working, it is determined whether the engine speed is less than the preset engine speed; When the engine speed is less than a preset engine speed, determining whether a difference between the hydraulic retarder oil temperature and the engine water temperature is greater than a first temperature difference value, and if so, determining that an exhaust fault exists in the hydraulic retarder; When the engine speed is greater than or equal to a preset engine speed, determining whether a difference between the hydraulic retarder oil temperature and the engine water temperature is greater than a second temperature difference value, and if so, determining that an exhaust fault exists in the hydraulic retarder; The first temperature difference is greater than the second temperature difference; The method further comprises: When the hydraulic retarder is in an operating state, determining whether the engine speed is less than an engine speed threshold; When the engine speed is less than an engine speed threshold, obtaining a hydraulic retarder water temperature and a difference between the hydraulic retarder water temperature and the engine water temperature; It is determined whether the hydraulic retarder water temperature is greater than a preset retarder water temperature and whether the difference between the hydraulic retarder water temperature and the engine water temperature is greater than a preset temperature difference; if so, it is determined that the hydraulic retarder has a high risk of water backflow.

2. The hydraulic retarder fault diagnosis method according to claim 1, characterized in that: The determining whether the engine speed is less than a preset engine speed includes: Determine whether the hydraulic retarder's exit operation time is greater than a preset exit time; When the hydraulic retarder's exit operation time is greater than the preset exit time, it is determined whether the engine speed is less than a preset engine speed.

3. The hydraulic retarder fault diagnosis method according to claim 1, characterized in that: Determining whether a difference between the hydraulic retarder oil temperature and the engine water temperature is greater than a first temperature difference value, and if so, determining that the hydraulic retarder has an exhaust fault, including: When the difference between the hydraulic retarder oil temperature and the engine water temperature is greater than the first temperature difference, determining whether a duration for which the difference between the hydraulic retarder oil temperature and the engine water temperature is greater than the first temperature difference is greater than a preset duration, and if so, determining that the hydraulic retarder has an exhaust fault; Determining whether a difference between the hydraulic retarder oil temperature and the engine water temperature is greater than a second temperature difference value, and if so, determining that an exhaust fault exists in the hydraulic retarder, including: When the difference between the hydraulic retarder oil temperature and the engine water temperature is greater than the second temperature difference, it is determined whether a duration during which the difference between the hydraulic retarder oil temperature and the engine water temperature is greater than the second temperature difference is greater than a preset duration; if so, it is determined that an exhaust fault exists in the hydraulic retarder.

4. The hydraulic retarder fault diagnosis method according to claim 1, characterized in that: The method further comprises: When it is determined that the hydraulic retarder has an exhaust failure, pressurizing the hydraulic retarder until the pressure of the hydraulic retarder reaches a preset pressure.

5. The hydraulic retarder fault diagnosis method according to claim 1, characterized in that: Determining whether the hydraulic retarder water temperature is greater than a preset retarder water temperature and whether the difference between the hydraulic retarder water temperature and the engine water temperature is greater than a preset temperature difference; If yes, it is determined that the hydraulic retarder has a high risk of backflow, including: Determining whether the hydraulic retarder water temperature is greater than a preset retarder water temperature and whether a difference between the hydraulic retarder water temperature and the engine water temperature is greater than a preset temperature difference; If so, it is determined that the current state is the first state, and it is determined whether the duration of the first state is greater than a duration threshold. If so, it is determined that the hydraulic retarder has a high risk of backflow.

6. The hydraulic retarder fault diagnosis method according to claim 5, characterized in that: The method further comprises: The displacement of the engine is acquired, and the engine speed threshold, the preset temperature difference, and the duration threshold are determined based on the displacement.

7. The hydraulic retarder fault diagnosis method according to claim 1, characterized in that: The method further comprises: When there is a high risk of water backflow in the hydraulic retarder, the water flow rate of the cooling system is increased.

8. A hydraulic retarder fault judgment device, characterized in that: include: The engine speed judgment unit is used to judge whether the engine speed is less than the preset engine speed when the hydraulic retarder stops working; a first exhaust fault determining unit, configured to determine, when the engine speed is less than a preset engine speed, whether a difference between the hydraulic retarder oil temperature and the engine water temperature is greater than a first temperature difference value, and if so, determine that an exhaust fault exists in the hydraulic retarder; a second exhaust fault determining unit, configured to determine, when the engine speed is greater than or equal to a preset engine speed, whether a difference between the hydraulic retarder oil temperature and the engine water temperature is greater than a second temperature difference value, and if so, determine that an exhaust fault exists in the hydraulic retarder; the first temperature difference value is greater than the second temperature difference value; The device is also used for: When the hydraulic retarder is in an operating state, determining whether the engine speed is less than an engine speed threshold; When the engine speed is less than an engine speed threshold, obtaining a hydraulic retarder water temperature and a difference between the hydraulic retarder water temperature and the engine water temperature; Determining whether the hydraulic retarder water temperature is greater than a preset retarder water temperature and whether a difference between the hydraulic retarder water temperature and the engine water temperature is greater than a preset temperature difference; If so, it is determined that the hydraulic retarder has a high risk of backflow.

9. A vehicle, characterized in that: comprising a memory and a processor, wherein, The memory is used to store programs; The processor is coupled to the memory and is used to execute the program stored in the memory to implement the steps of the hydraulic retarder fault judgment method according to any one of claims 1 to 7.

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