High voltage fault diagnosis method, device, vehicle and storage medium

Abstract

The present invention provides a method, device, vehicle, and storage medium for diagnosing a high-voltage drop fault, belonging to the field of smart vehicle technology. The method includes: when a high-voltage drop fault occurs in a vehicle, performing a communication self-test and a vehicle controller self-test on the vehicle; when the communication self-test is normal and the vehicle controller self-test is normal, diagnosing the high-voltage related components of the vehicle in sequence according to a preset priority order, and locating the vehicle component that has experienced the high-voltage drop fault; and providing fault feedback based on the fault type of the vehicle component. The present invention can effectively eliminate the influence of the vehicle communication system and controller on the high-voltage drop fault, and can accurately locate the vehicle component that has experienced the high-voltage drop fault, thereby improving the efficiency and accuracy of high-voltage drop fault diagnosis. At the same time, based on the fault type, fault feedback is provided to facilitate maintenance personnel to handle the high-voltage drop fault.

Description

Technical Field

[0001] The present invention relates to the field of smart vehicle technology, and in particular to a method, device, vehicle and storage medium for diagnosing a high-voltage drop fault. Background Art

[0002] With the rapid development of new energy vehicles, the degree of electrification of vehicle components is increasing. In addition to driving large motor systems, many components have achieved high voltage and electrification, such as high-voltage electric power steering, electric air compressors, high-voltage to low-voltage DC converters, and high-voltage electric air conditioners.

[0003] During the use of a vehicle, a high-voltage drop fault may occur, and the causes of the high-voltage drop fault are various. In the existing technology, the fault diagnosis method for the high-voltage drop fault is through manual detection. Based on manual diagnostic operations, fault detection is performed on the vehicle components corresponding to the diagnostic operation. This detection method is generally a large-scale detection and cannot be specific to each component. In addition, the vehicle communication line and controller will not be self-checked before diagnosis, and the impact of the vehicle communication line and controller on the high-voltage drop fault cannot be ruled out.

[0004] It can be seen that the existing technology has technical problems in that it cannot eliminate the influence of vehicle communication lines and controllers on high voltage drop faults when diagnosing high voltage drop faults, and cannot locate the specific faulty parts. Summary of the Invention

[0005] In view of this, it is necessary to provide a high-voltage drop fault diagnosis method, device, vehicle and storage medium to solve the technical problems in the existing technology that when diagnosing a high-voltage drop fault, the influence of the vehicle communication line and controller on the high-voltage drop fault cannot be eliminated, and the specific faulty parts cannot be located.

[0006] In order to solve the above technical problems, the present invention provides a method for diagnosing a high voltage drop fault, comprising:

[0007] When a high voltage failure occurs in the vehicle, the vehicle will be self-checked for communication and the vehicle controller;

[0008] When the communication self-test is normal and the vehicle controller self-test is normal, the vehicle high-voltage related components are diagnosed in sequence according to the preset priority order to locate the vehicle component with the high-voltage failure;

[0009] Based on the fault type of the vehicle component, fault feedback is given.

[0010] As a possible implementation manner of the present invention, in this implementation manner, the vehicle communication self-test and vehicle controller self-test include:

[0011] Obtaining system signals of each vehicle system received by the CAN bus, and judging whether the system signals of each system are complete based on a preset gateway protocol, so as to judge whether the vehicle communication is normal;

[0012] The version information of the vehicle control program and the fault code information of the vehicle are obtained, and whether the controller is faulty is detected based on the version information and the fault code information.

[0013] As a possible embodiment of the present invention, in this embodiment, fault diagnosis is performed on vehicle high-voltage related components in sequence according to a preset priority order to locate the vehicle component with a high-voltage fault, including:

[0014] Based on the preset priority order, the vehicle battery management system, vehicle motor controller, and other high-voltage related components are diagnosed in turn, and when the high-voltage related components of the previous priority are ensured to be normal, the high-voltage related components of the next priority are diagnosed.

[0015] As a possible implementation manner of the present invention, in this implementation manner, fault diagnosis of the vehicle battery management system includes:

[0016] Ensure that the battery management system is in a high-voltage interlock state and check whether each single cell of the vehicle battery is normal;

[0017] Check whether the vehicle battery bus voltage is normal and whether the contact status of the positive and negative contactors of the vehicle battery bus is normal.

[0018] As a possible implementation manner of the present invention, in this implementation manner, fault diagnosis of the vehicle motor controller includes:

[0019] Ensure that the motor controller is in a high-voltage interlock state, obtain a motor operation status signal, and determine whether the motor controller is normal based on the motor operation status signal.

[0020] As a possible implementation manner of the present invention, in this implementation manner, performing fault diagnosis on the other high-voltage related components includes:

[0021] Based on the vehicle air conditioning operating status information, the energy recovery system operating status information and the low-voltage wiring harness status information, it is determined whether the vehicle air conditioning is normal, whether the energy recovery system is normal and whether the low-voltage wiring harness is normal.

[0022] As a possible implementation manner of the present invention, in this implementation manner, providing fault feedback based on the fault type of the vehicle component includes:

[0023] Based on the fault type of the vehicle component and in combination with associated components of the vehicle component, fault feedback is determined.

[0024] On the other hand, the present invention also provides a high voltage drop fault diagnosis device, comprising:

[0025] The first self-test module is used to perform a communication self-test and a vehicle controller self-test on the vehicle when a high voltage failure occurs in the vehicle;

[0026] The second self-test module is used to diagnose the vehicle's high-voltage related components in sequence according to the preset priority order when the communication self-test and the vehicle controller self-test are normal, and locate the vehicle component with the high-voltage failure;

[0027] The feedback module is used to provide fault feedback based on the fault type of the vehicle component.

[0028] In another aspect, the present invention further provides a vehicle, comprising a memory and a processor, wherein:

[0029] The memory is used to store programs;

[0030] The processor is coupled to the memory and is configured to execute the program stored in the memory to implement the steps of the high voltage drop fault diagnosis method described in any of the above implementations.

[0031] On the other hand, the present invention also provides a computer-readable storage medium for storing computer-readable programs or instructions, which, when executed by a processor, can implement the steps of the high-voltage fault diagnosis method described in any of the above implementations.

[0032] The beneficial effects of the present invention are as follows: the high-voltage drop fault diagnosis method provided by the present invention, when a high-voltage drop fault occurs in a vehicle, first performs a self-check on the vehicle's communication system and controller, and when the communication system and controller are normal, based on the priority order of each high-voltage related component, performs fault diagnosis on each high-voltage related component in turn, which can effectively eliminate the influence of the vehicle communication system and controller on the high-voltage drop fault, and can accurately locate the vehicle component where the high-voltage drop fault occurs, thereby improving the efficiency and accuracy of high-voltage drop fault diagnosis, and at the same time, provides fault feedback based on the fault type, which is convenient for maintenance personnel to deal with the high-voltage drop fault. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 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.

[0034] Figure 1A schematic flow chart of a method for diagnosing a high voltage drop fault provided by an embodiment of the present invention;

[0035] Figure 2 A flowchart of a high voltage drop fault self-test method provided by an embodiment of the present invention;

[0036] Figure 3 A flowchart of a battery management system diagnostic method provided by an embodiment of the present invention;

[0037] Figure 4 A schematic structural diagram of a high voltage drop fault diagnosis device provided by an embodiment of the present invention;

[0038] Figure 5 A schematic structural diagram of a vehicle provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0039] 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.

[0040] The terms "first," "second," and so on, used in the embodiments of the present invention are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, technical features designated as "first" or "second" may explicitly or implicitly include at least one such feature.

[0041] 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.

[0042] The present invention provides a high voltage drop fault diagnosis method, device, vehicle and storage medium, which are described below respectively.

[0043] Figure 1 A flow chart of an embodiment of the high voltage drop fault diagnosis method provided by the present invention is shown as follows: Figure 1 As shown in the figure, the high voltage drop fault diagnosis method includes:

[0044] S101, when a high voltage failure occurs in the vehicle, the vehicle communication self-check and the vehicle controller self-check are performed;

[0045] S102, when the communication self-test is normal and the vehicle controller self-test is normal, fault diagnosis is performed on the vehicle high-voltage related components in sequence according to the preset priority order to locate the vehicle component with the high-voltage failure;

[0046] S103: providing fault feedback based on the fault type of the vehicle component.

[0047] In an embodiment of the present invention, a high-voltage drop fault refers to that the driving voltage of the high-voltage driving component of the vehicle cannot reach the minimum driving voltage value, that is, the high-voltage driving component cannot work normally, such as a power battery fault, a high-voltage circuit fault, etc. Performing communication self-test and vehicle controller self-test on the vehicle refers to performing fault diagnosis on the vehicle's CAN (Controller Area Network) bus communication status and the vehicle controller. Because CAN bus communication fault and vehicle controller fault are not high-voltage drop faults in the strict sense, but may cause the high-voltage driving component to fail to work normally, it is necessary to first eliminate the impact of CAN bus communication fault and vehicle controller fault on high-voltage drop fault diagnosis.

[0048] In an embodiment of the present invention, upon determining that CAN bus communication and the vehicle controller are both normal, fault diagnosis can be initiated for the vehicle's high-voltage-related components. These high-voltage-related components refer to onboard components requiring a high-voltage drive power supply, as well as the vehicle's high-voltage power supply components and high-voltage transmission lines. The high-voltage-related components have a preset priority order, which can be set based on, for example, the probability of a fault occurring and the severity of a fault, and is not limited by the present invention.

[0049] In this embodiment of the present invention, fault diagnosis of high-voltage-related components is performed sequentially based on a preset priority order, allowing precise location of the vehicle component experiencing a high-voltage failure. After locating the component experiencing a high-voltage failure, fault feedback is provided based on the fault type. This feedback may include the cause of the failure, the corresponding component to be inspected, and repair recommendations.

[0050] The high-voltage drop fault diagnosis method provided by the present invention first performs a self-check on the vehicle's communication system and controller when a high-voltage drop fault occurs. When the communication system and the controller are normal, the method performs a fault diagnosis on each high-voltage related component in turn based on the priority order of each high-voltage related component. This method can effectively eliminate the influence of the vehicle's communication system and controller on the high-voltage drop fault, and can accurately locate the vehicle component where the high-voltage drop fault occurs, thereby improving the efficiency and accuracy of high-voltage drop fault diagnosis. At the same time, based on the fault type, fault feedback is given to facilitate maintenance personnel to deal with the high-voltage drop fault.

[0051] As a possible embodiment of the present invention, in this embodiment, Figure 2 As shown, the vehicle performs communication self-test and vehicle controller self-test, including:

[0052] S201, obtaining system signals of each vehicle system received by the CAN bus, and determining whether the system signals of each system are complete based on a preset gateway protocol to determine whether the vehicle communication is normal;

[0053] S202 , obtaining version information of the vehicle control program and fault code information of the vehicle, and detecting whether the controller is faulty based on the version information and the fault code information.

[0054] In an embodiment of the present invention, when performing a self-test on the vehicle's CAN bus, system information from each vehicle system connected to the CAN bus can be checked. For example, if a vehicle has 10 systems, the CAN bus should be able to receive system signals from all 10 systems. However, if the CAN bus receives fewer than 10 system signals, it indicates that the CAN bus is not communicating properly and requires troubleshooting. Specifically, a preset gateway protocol can be used to confirm whether the CAN bus can read system signals from all systems.

[0055] In an embodiment of the present invention, when performing a self-test on a vehicle controller, the control program version information can be obtained first to ensure that the program version is the most recent since the vehicle was manufactured, thereby ensuring that the control program can operate normally. Furthermore, if the fault indicator light on the vehicle's instrument panel illuminates, indicating a fault in the vehicle controller and related systems, the vehicle controller's fault code can be obtained and the vehicle fault information can be determined based on the fault code.

[0056] The embodiment of the present invention can effectively eliminate the influence of the CAN bus and the vehicle controller on the high-voltage fault diagnosis by first performing a self-test on the vehicle CAN bus and the vehicle controller.

[0057] As a possible embodiment of the present invention, in this embodiment, fault diagnosis is performed on vehicle high-voltage related components in sequence according to a preset priority order to locate the vehicle component with a high-voltage fault, including:

[0058] Based on the preset priority order, the vehicle battery management system, vehicle motor controller, and other high-voltage related components are diagnosed in turn, and when the high-voltage related components of the previous priority are ensured to be normal, the high-voltage related components of the next priority are diagnosed.

[0059] In an embodiment of the present invention, based on a preset priority order, the vehicle battery management system has the highest priority, followed by the vehicle motor controller, and then other high-voltage related components. Among them, it is necessary to ensure that the high-voltage related components of the previous priority are normal, and then detect the high-voltage related components of the next priority. Because when the high-voltage related components of the previous priority fail, it may cause the normal high-voltage related components of the next priority to also report a failure. Therefore, it is necessary to perform fault diagnosis on the high-voltage related components according to the preset priority order in order to accurately locate the fault. Based on this, it is necessary to first detect the vehicle battery management system. If the vehicle battery management system is normal, then detect the vehicle motor controller. If the vehicle motor controller is normal, finally detect other high-voltage related components.

[0060] The embodiment of the present invention detects high-voltage related components strictly according to a preset priority order, and can accurately locate faulty components.

[0061] As a possible embodiment of the present invention, in this embodiment, Figure 3 As shown, the vehicle battery management system is diagnosed for faults, including:

[0062] S301, ensuring that the battery management system is in a high-voltage interlock state and detecting whether each single cell of the vehicle battery is normal;

[0063] S302, detecting whether the vehicle-mounted battery bus voltage is normal, and detecting whether the contact status of the vehicle-mounted battery bus positive and negative contactors is normal.

[0064] In an embodiment of the present invention, when diagnosing a high-voltage failure in the battery management system of a vehicle, it is necessary to first ensure that the battery management system of the vehicle is in a high-voltage interlock state. Specifically, the high-voltage interlock state value of the battery management system can be obtained. When the high-voltage interlock state value of the battery management system is 0, it indicates that the battery management system is in an interlock state. When the high-voltage interlock state value of the battery management system is 1, it indicates that the battery management system has entered a high-voltage interlock state. The battery management system needs to be adjusted to a high-voltage interlock state before the battery management system is tested. In addition, if the high-voltage interlock state value of the battery management system is 2, it indicates that an error has occurred in the high-voltage interlock program and the high-voltage interlock fault needs to be eliminated first. After the high-voltage interlock fault is eliminated, if the high-voltage failure of the vehicle is restored, there is no need to perform a high-voltage failure test on the vehicle. If the high-voltage failure of the vehicle still exists, the high-voltage failure test continues to be performed on the vehicle.

[0065] In the embodiment of the present invention, for the fault diagnosis of the battery management system, the voltage value and temperature value of each single battery can be obtained, and the voltage value and temperature value can be compared with the preset voltage threshold and temperature threshold to determine whether each single battery is faulty. ,like Greater than the maximum value of the standard voltage , or less than the minimum value of the standard voltage , it means that there is a problem with the single battery and it is necessary to check whether the single battery has leakage, short circuit and other faults; if there is leakage, the surrounding multiple harnesses may be corroded, the voltage value is zero, there is a short circuit, the temperature rises, the harness is melted or adhered. ,like If the problem is not within the normal range, it means that there is a problem with the single battery. It is necessary to check the battery operating temperature environment or check whether the battery is short-circuited. If the battery temperature is too high, combined with the coolant temperature, it can be determined whether there is an internal battery short circuit or a coolant system problem.

[0066] In an embodiment of the present invention, when performing fault diagnosis on the battery management system, the busbar of the battery management system can also be tested, specifically, whether the contactor signal is normal; whether the high-voltage signal and the low-voltage signal are normal; if the high voltage is too low, combined with the battery voltage, if the battery voltage is normal and the busbar high-voltage signal is low, then the busbar is detected for damage; if the low-voltage signal is too high, then the busbar is detected for short circuit and burning; if the battery voltage is also too low, then the battery is detected for fault.

[0067] The embodiment of the present invention can determine whether the vehicle high voltage failure is caused by the battery system by performing fault diagnosis on the battery management system. It can be accurate to a single battery, and the judgment of the fault location is more precise.

[0068] As a possible implementation of the present invention, in this implementation, fault diagnosis of a vehicle motor controller includes:

[0069] Ensure that the motor controller is in the high-voltage interlock state, obtain the motor operation status signal, and determine whether the motor controller is normal based on the motor operation status signal.

[0070] In an embodiment of the present invention, when the vehicle's battery management system is normal, it is necessary to perform fault diagnosis on the vehicle's motor controller. Similarly, it is necessary to ensure that the motor controller is in a high-voltage interlock state. The adjustment of the high-voltage interlock state is the same as that in the previous embodiment and will not be repeated here.

[0071] In an embodiment of the present invention, when diagnosing a motor controller fault, it is necessary to combine the power-on enable signal, the main / auxiliary drive contactor signal, the motor voltage signal, the DC / AC inverter direct / alternating voltage signal, the motor fan enable signal, the speed signal, and the like to determine whether the motor controller is faulty. Specifically, for the enable signal, 1 can be set to indicate successful enable signal transmission, 0 to indicate failure to transmit the enable signal, and 2 to indicate an error state. When the enable signal is 2, it is necessary to combine the vehicle controller and the CAN bus to determine whether the fault occurs in the transmission of the motor enable signal. For the main / auxiliary drive relay signal, 1 can be set to indicate a closed state, 0 to indicate a closed state, and 2 to indicate an error state. When the enable signal is 2, it is necessary to combine the vehicle controller and the CAN bus to determine whether the fault occurs in the transmission of the main / auxiliary drive relay signal. When troubleshooting the above two signals, the above two signals will actively attempt to transmit a closed signal to test whether the closed signal can be transmitted normally. If not, it is necessary to re-check whether the vehicle communication and the vehicle controller are normal. Detecting DC / AC inverter and motor voltage signals requires combining the battery voltage to determine the voltage values ​​on the inverter's DC and AC sides, as well as the input motor voltage. If the battery voltage is normal and the inverter's high-voltage signal is low, the system checks for inverter faults. If the low-voltage signal is too high, it can indicate a short circuit. If the battery voltage is also too low, the system checks for battery faults. For motor fan signal detection, the system can set the value to 1 for successful enable signal transmission, 0 for failure, and 2 for an error. If the value is 2, the system needs to determine whether the fault lies in the motor fan enable signal transmission, based on the vehicle controller and CAN bus status. For speed signal detection, the system checks whether the signal value is below normal, potentially causing excessive motor temperature and impacting normal operation.

[0072] The embodiment of the present invention can eliminate a motor controller fault or accurately locate a faulty component of the motor controller by detecting various signals of the motor controller.

[0073] As a possible implementation of the present invention, in this implementation, fault diagnosis of other high-voltage related components includes:

[0074] Based on the vehicle air conditioning operating status information, the energy recovery system operating status information and the low-voltage wiring harness status information, it is determined whether the vehicle air conditioning is normal, whether the energy recovery system is normal and whether the low-voltage wiring harness is normal.

[0075] In an embodiment of the present invention, other high-voltage related components include but are not limited to a vehicle-mounted air-conditioning system, an energy recovery system, a low-voltage wiring harness, etc. Specifically, for the vehicle-mounted air-conditioning system, it is necessary to detect the DC / AC inverter direct / alternating side voltage signal, power-on enable signal, contactor status signal, and air-conditioning compressor signal. The specific detection principle is similar to that of the aforementioned embodiment and will not be repeated here. For the energy recovery system, the detection of DC / AC inverter and motor voltage signals requires combining the battery voltage to judge the voltage values ​​of the DC and AC sides of the inverter, and to judge the voltage value of the input motor. If the battery voltage is normal and the inverter high-voltage signal is low, detect whether the inverter is faulty, the low-voltage signal is too high, or there is a short circuit; if the battery voltage is also too low, detect whether the battery is faulty; for the detection of low-voltage wiring harnesses, compare the normal range of the low-voltage wiring harness voltage value signal. When the signal value is detected to be too low, detect whether the wiring harness is damaged or the interface is loose; when the signal value is detected to be too high, detect whether the wiring harness is short-circuited or the wiring harness is sticking. If the voltage of several parallel wiring harnesses is too high and the voltage values ​​are basically the same, it can be determined that the wiring harness is sticking, resulting in excessive resistance, and the wiring harness with abnormal values ​​is located and sent to the instrument.

[0076] The embodiment of the present invention expands the scope of high-voltage fault diagnosis by detecting other high-voltage related components, and can accurately locate the faulty component.

[0077] As a possible embodiment of the present invention, in this embodiment, fault feedback is provided based on the fault type of the vehicle component, including:

[0078] Based on the fault type of the vehicle component and in combination with the associated components of the vehicle component, the fault feedback is determined.

[0079] In an embodiment of the present invention, for example, if the vehicle has battery leakage, wiring harness melting, adhesion, etc., feedback suggestions will be given based on the signal values ​​of surrounding devices after positioning is completed. For example, when the battery is leaking, the wiring harness around the battery may be corroded, the voltage value may be zero, there may be a short circuit, and the temperature may rise. Feedback may be "Please check whether there is leakage in a certain battery" or similar suggestions.

[0080] The high-voltage drop fault diagnosis method provided by the present invention first performs a self-check on the vehicle's communication system and controller when a high-voltage drop fault occurs. When the communication system and the controller are normal, the method performs a fault diagnosis on each high-voltage related component in turn based on the priority order of each high-voltage related component. This method can effectively eliminate the influence of the vehicle's communication system and controller on the high-voltage drop fault, and can accurately locate the vehicle component where the high-voltage drop fault occurs, thereby improving the efficiency and accuracy of high-voltage drop fault diagnosis. At the same time, based on the fault type, fault feedback is given to facilitate maintenance personnel to deal with the high-voltage drop fault.

[0081] In order to better implement the high voltage failure diagnosis method in the embodiment of the present invention, based on the high voltage failure diagnosis method, correspondingly, Figure 4 As shown, an embodiment of the present invention further provides a high voltage drop fault diagnosis device, and the high voltage drop fault diagnosis device 400 includes:

[0082] The first self-test module 401 is used to perform a communication self-test and a vehicle controller self-test on the vehicle when a high voltage failure occurs in the vehicle;

[0083] The second self-test module 402 is used to diagnose the vehicle high-voltage related components in sequence according to the preset priority order when the communication self-test and the vehicle controller self-test are normal, and locate the vehicle component with the high-voltage failure;

[0084] The feedback module 403 is used to provide fault feedback based on the fault type of the vehicle component.

[0085] The high voltage drop fault diagnosis device 400 provided in the above embodiment can implement the technical solution described in the above embodiment of the high voltage drop fault diagnosis method. The specific implementation principles of the above modules or units can refer to the corresponding contents in the above embodiment of the high voltage drop fault diagnosis method, which will not be repeated here.

[0086] like Figure 5 As shown, the present invention also provides a vehicle 500. The vehicle 500 includes a processor 501, a memory 502 and a display 503. Figure 5 Only some of the components of vehicle 500 are shown, but it should be understood that implementing all of the shown components is not a requirement, and greater or fewer components may alternatively be implemented.

[0087] In some embodiments, the processor 501 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 502 , such as the high voltage drop fault diagnosis method of the present invention.

[0088] In some embodiments, processor 501 may be a single server or a server group. The server group may be centralized or distributed. In some embodiments, processor 501 may be local or remote. In some embodiments, processor 501 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.

[0089] In some embodiments, the memory 502 may be an internal storage unit of the vehicle 500, such as a hard drive or memory of the vehicle 500. In other embodiments, the memory 502 may be an external storage device of the vehicle 500, such as a plug-in hard drive, a smart media card (SMC), a secure digital (SD) card, a flash card, etc., equipped in the vehicle 500.

[0090] Furthermore, the memory 502 may include both an internal storage unit of the vehicle 500 and an external storage device. The memory 502 is used to store application software installed in the vehicle 500 and various data.

[0091] In some embodiments, display 503 can be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, or an OLED (Organic Light-Emitting Diode) touchscreen. Display 503 is used to display information about vehicle 500 and to present a visual user interface. Components 501-503 of vehicle 500 communicate with each other via a system bus.

[0092] In one embodiment, when the processor 501 executes the high voltage drop fault diagnosis program in the memory 502, the following steps may be implemented:

[0093] When a high voltage failure occurs in the vehicle, the vehicle will be self-checked for communication and the vehicle controller;

[0094] When the communication self-test is normal and the vehicle controller self-test is normal, the vehicle high-voltage related components are diagnosed in sequence according to the preset priority order to locate the vehicle component with the high-voltage failure;

[0095] Provide fault feedback based on the fault type of vehicle components.

[0096] It should be understood that, when the processor 501 executes the high voltage drop fault diagnosis program in the memory 502 , 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.

[0097] Accordingly, an embodiment of the present invention also 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, it can implement the steps or functions of the high-voltage fault diagnosis method provided in the above-mentioned method embodiments.

[0098] 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.

[0099] The above is a detailed introduction to the high-voltage fault diagnosis method, device, vehicle and storage medium provided by the present invention. Specific examples are used in this article 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 technical personnel in this field, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for diagnosing a high voltage drop fault, characterized in that: include: When a high voltage failure occurs in the vehicle, the vehicle will be self-checked for communication and the vehicle controller; When the communication self-test is normal and the vehicle controller self-test is normal, the vehicle high-voltage related components are diagnosed in sequence according to the preset priority order to locate the vehicle component with the high-voltage failure; Providing fault feedback based on the fault type of the vehicle component; Among them, according to the preset priority order, the vehicle high-voltage related components are diagnosed in turn to locate the vehicle component with high-voltage failure, including: Based on the preset priority order, the vehicle battery management system, vehicle motor controller, and other high-voltage related components are diagnosed in sequence. When the high-voltage related components of the previous priority are guaranteed to be normal, the high-voltage related components of the next priority are diagnosed. Performing fault diagnosis on the vehicle battery management system includes: Ensure that the battery management system is in a high-voltage interlock state and check whether each single cell of the vehicle battery is normal; Check whether the vehicle battery bus voltage is normal and whether the contact status of the positive and negative contactors of the vehicle battery bus is normal; Performing fault diagnosis on the vehicle motor controller includes: ensuring that the motor controller is in a high-voltage interlock state, obtaining a motor operation status signal, and determining whether the motor controller is normal based on the motor operation status signal; Performing fault diagnosis on the other high-voltage related components includes: Based on the vehicle air conditioning operating status information, the energy recovery system operating status information and the low-voltage wiring harness status information, it is determined whether the vehicle air conditioning is normal, whether the energy recovery system is normal and whether the low-voltage wiring harness is normal.

2. The high voltage drop fault diagnosis method according to claim 1, characterized in that: The vehicle communication self-test and vehicle controller self-test include: Obtaining system signals of each vehicle system received by the CAN bus, and judging whether the system signals of each system are complete based on a preset gateway protocol, so as to judge whether the vehicle communication is normal; The version information of the vehicle control program and the fault code information of the vehicle are obtained, and whether the controller is faulty is detected based on the version information and the fault code information.

3. The high voltage drop fault diagnosis method according to claim 1, characterized in that: Providing fault feedback based on the fault type of the vehicle component includes: Based on the fault type of the vehicle component and in combination with associated components of the vehicle component, fault feedback is determined.

4. A high voltage fault diagnosis device, applicable to the fault diagnosis method according to any one of claims 1 to 3, characterized in that: include: The first self-test module is used to perform a communication self-test and a vehicle controller self-test on the vehicle when a high voltage failure occurs in the vehicle; The second self-test module is used to diagnose the vehicle's high-voltage related components in sequence according to the preset priority order when the communication self-test and the vehicle controller self-test are normal, and locate the vehicle component with the high-voltage failure; The feedback module is used to provide fault feedback based on the fault type of the vehicle component.

5. 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 configured to execute the program stored in the memory to implement the steps of the high voltage drop fault diagnosis method according to any one of claims 1 to 3.

6. A computer-readable storage medium, characterized in that Used to store computer-readable programs or instructions, which, when executed by a processor, can implement the steps of the high-voltage failure diagnosis method described in any one of claims 1 to 3.

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