Fault processing method and system of electric vehicle driving system

Abstract

The invention discloses a fault processing method and system for an electric vehicle driving system, and belongs to the field of vehicle fault processing. Comprising the steps of detecting a current fault of the electric drive system; the motor controller classifies the current faults according to preset fault levels, the fault levels comprise at least seven levels, and corresponding fault processing operation is executed according to the corresponding fault levels; the fault level is also synchronized to a vehicle controller, and the vehicle controller executes corresponding fault processing operation according to the corresponding fault level, including driving a vehicle instrument fault indication module to perform fault prompt according to the corresponding fault level. According to the invention, 7-level classification and level-to-level management is carried out according to the influence degree of the typical fault of the driving system on the whole vehicle, and an accurate differentiation processing mechanism is formulated, so that the influence of the fault of the driving system on the functions and driving safety of the whole vehicle is reduced to the maximum extent.

Description

Technical Field

[0001] The present invention belongs to the field of vehicle fault processing, and in particular relates to a fault processing method and system for an electric vehicle drive system. Background Art

[0002] When an electric vehicle drive system fails, existing technologies generally use a method of directly cutting off the power output and the high voltage of the entire vehicle. However, directly cutting off the power output regardless of the fault status during vehicle driving can easily cause safety accidents.

[0003] The prior art also has a certain level of management for electric drive system faults. For example, the patent publication number CN116729125A, published on September 12, 2023, and titled "Method, Device, Electronic Equipment, and Vehicle for Handling Electric Drive System Faults" discloses a method, device, electronic equipment, and vehicle for handling electric drive system faults. The present invention relates to the field of smart cars, wherein the method includes: obtaining fault information of the electric drive system, wherein the fault information is used to characterize the information of the fault occurring in the electric drive system; determining the fault level of the electric drive system based on the fault information; performing component-level fault handling on the electric drive system based on the fault level to obtain a target handling result; and performing vehicle-level fault handling on the vehicle based on the target handling result.

[0004] However, on the one hand, the existing fault classification and handling methods are not detailed enough, and the impact of electric drive system failures on the vehicle's functions and driving safety is still significant. On the other hand, the existing fault classification management cannot provide comprehensive prompt information to the driver while handling the fault.

[0005] To this end, the present invention proposes a fault processing method and system for an electric vehicle drive system. Summary of the Invention

[0006] The present invention aims to overcome the shortcomings of the existing technology and proposes a fault handling method and system for electric vehicle drive systems to achieve the following objectives: to conduct seven-level classification and grading management based on the degree of impact of typical drive system faults on the entire vehicle, and to formulate a precise differentiated handling mechanism to minimize the impact of drive system faults on the entire vehicle function and driving safety.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is: a fault handling method for an electric vehicle drive system, the method comprising:

[0008] Detect current faults in the electric drive system;

[0009] The motor controller classifies the current fault according to a preset fault level, which includes at least seven levels, and performs corresponding fault handling operations according to the corresponding fault level;

[0010] The fault level is also synchronized to the vehicle controller, and the vehicle controller executes corresponding fault handling operations according to the corresponding fault level, including driving the vehicle instrument fault indication module to provide a fault prompt according to the corresponding fault level; the vehicle instrument fault indication module includes a maintenance indicator light, a power limit indicator light, an electric drive system fault light, a Ready indicator light, a high-voltage cut-off indicator light, a hazard warning flasher, and a text prompt display screen.

[0011] Preferably, the first-level fault includes the electric drive system losing communication with the BMS and losing communication with the TBOX;

[0012] Level 2 faults apply only to oil-cooled motors and include oil cooling system faults;

[0013] Level 3 faults include phase overcurrent warning; DC bus undervoltage, overvoltage, overtemperature warning; motor overspeed warning; temperature sensor sampling warning; torque monitoring warning; motor stall warning;

[0014] Level 4 faults include high voltage loop interlock faults and cover protection faults;

[0015] Level 5 faults only occur during the power-on self-test process and are not triggered during vehicle driving. This includes electric drive system initialization self-test faults.

[0016] Level 6 faults include phase overcurrent fault; DC bus undervoltage and overtemperature fault; motor overspeed fault; torque monitoring fault; voltage and power supply abnormality;

[0017] The seven-level faults include DC bus overvoltage fault, IGBT module fault, phase current sensor fault, motor position sensor fault, communication failure with the motor controller, and loss of communication with the vehicle controller.

[0018] Preferably, the fault handling operation of the motor controller for each level of fault includes:

[0019] For both level 1 and level 2 faults, the motor controller maintains the current state and records the DTC and the fault time data;

[0020] In case of level 3 fault, the motor controller controls the motor to limit power output, and records DTC and fault time data;

[0021] In the case of a level 4 fault, the motor controller controls the motor power output according to the current vehicle speed and records the DTC and the fault time data.

[0022] In case of level 5 fault, the motor controller prohibits the motor from outputting and records the DTC and the fault time data.

[0023] In case of level 6 fault, the motor controller controls the motor to limit power output within 5 seconds, prohibits output after 5 seconds, and records DTC and fault time data;

[0024] In case of level 7 fault, the motor controller immediately disables the motor output, records the DTC, and records the data at the time of the fault.

[0025] Preferably, in the event of a level four fault, the motor controller controls the power output of the motor according to the current vehicle speed, including: if the current vehicle speed is greater than a preset vehicle speed threshold, the motor controller controls the motor to limit power output until the vehicle speed drops to the preset vehicle speed threshold; if the current vehicle speed is less than or equal to the preset vehicle speed threshold, the motor controller controls the motor to prohibit output.

[0026] Preferably, the fault handling operation of the vehicle controller for each level of fault includes:

[0027] Level 1 fault, the vehicle controller records DTC;

[0028] In case of a secondary fault, the vehicle controller lights up the maintenance indicator light and prompts "Electric drive system maintenance" through the text prompt display;

[0029] In case of level 3 fault, the vehicle controller lights up the power limit indicator light and displays a message "Electric drive system power limit" on the text display.

[0030] For level 4 faults, the vehicle controller controls the vehicle instrument fault indication module to give a prompt based on the current vehicle speed;

[0031] In the case of a level 5 fault, the vehicle controller lights up the electric drive system fault indicator, turns off the Ready indicator, prohibits the vehicle from being powered on, and displays a text prompt indicating "electric drive system fault";

[0032] In case of a level 6 fault, the vehicle controller lights up the electric drive system fault indicator, the hazard warning lights, and a text prompt screen displays "Electric drive system fault, power cut off in 5 seconds." A timer starts, and the Ready indicator turns off after 5 seconds.

[0033] In the case of a level 7 fault, the vehicle controller immediately turns on the electric drive system fault light, turns on the hazard warning lights, turns off the Ready indicator light, and displays an "electric drive system fault" on the text prompt display.

[0034] Preferably, for a level 4 fault, the vehicle controller controls the vehicle instrument fault indication module to give a prompt according to the current vehicle speed, including:

[0035] If the current vehicle speed is greater than the preset vehicle speed threshold, the vehicle controller lights up the electric drive system fault lamp, and prompts "electric drive system fault" through the text prompt display screen until the vehicle speed decreases to the preset vehicle speed threshold; if the current vehicle speed is less than or equal to the preset vehicle speed threshold, the vehicle controller lights up the electric drive system fault lamp, turns off the Ready indicator light, simultaneously, cuts off the high voltage of the vehicle, lights up the high voltage cut-off indicator light, and prompts "electric drive system fault" through the text prompt display screen.

[0036] Preferably, the vehicle speed threshold is set to 3km / h.

[0037] Preferably, the first, third, fourth and sixth level faults automatically stop and reset the corresponding fault handling operation after the corresponding fault is removed; the second, fifth and seventh level faults need to manually stop the corresponding fault handling operation and reset after the corresponding fault is removed.

[0038] The application also proposes a fault handling system of an electric vehicle driving system, which uses the above-mentioned fault handling method of an electric vehicle driving system, and the system comprises a fault detection module, a motor controller, a vehicle controller, and a vehicle instrument fault indication module connected in sequence; wherein,

[0039] The fault detection module is used for detecting faults and sending to the motor controller;

[0040] The motor controller is used for classifying the current fault according to the preset fault level, the fault level at least includes seven levels, and performing the corresponding fault handling operation according to the corresponding fault level; the fault level is also sent to the vehicle controller;

[0041] The vehicle controller is used for performing the corresponding fault handling operation according to the corresponding fault level, including driving the vehicle instrument fault indication module to perform fault prompt according to the corresponding fault level;

[0042] The vehicle instrument fault indication module comprises a maintenance indicator light, a power limit indicator light, an electric drive system fault lamp, a Ready indicator light, a high voltage cut-off indicator light, a danger alarm flash light, and a text prompt display screen, which are all connected with the vehicle controller.

[0043] Preferably, the fault detection module adopts an on-board automatic diagnostic system OBD.

[0044] The technical effect of the application is:

[0045] The application realizes accurate differentiation of different severity faults by dividing the faults into seven levels and clearly defining the typical scenarios of each level of fault. At the same time, a precise differentiated handling mechanism is formulated to ensure that each type of fault can match the corresponding handling strategy, thereby maximizing the reduction of the impact of driving system faults on the vehicle function and driving safety.

[0046] The vehicle instrument fault indication module of the present invention integrates 7 types of indicator lights and a text prompt display screen, realizing the "visualization + text" dual transmission of fault information, providing comprehensive prompt information to the driver and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A flow chart of a fault handling method for an electric vehicle drive system provided by an embodiment of the present invention;

[0048] Figure 2 A structural block diagram of a fault handling system for an electric vehicle drive system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0049] The following is a further detailed description of the specific implementation of the present invention through the description of the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and to facilitate its implementation. It should be noted that the terms "first" and "second" described in this application are only used to facilitate the description of the technical solution to distinguish components. The corresponding component configurations may be the same or different, and are not intended to limit this application. In order to make the technical solution of the present invention clearer, the present invention is explained through the following embodiments.

[0050] This embodiment provides a method for troubleshooting an electric vehicle drive system. Figure 1 As shown, the method includes:

[0051] Detect current faults in the electric drive system;

[0052] The motor controller classifies the current fault according to a preset fault level, which includes at least seven levels, and performs corresponding fault handling operations according to the corresponding fault level;

[0053] The fault level is also synchronized to the vehicle controller, and the vehicle controller executes corresponding fault handling operations according to the corresponding fault level, including driving the vehicle instrument fault indication module to provide a fault prompt according to the corresponding fault level; the vehicle instrument fault indication module includes a maintenance indicator light, a power limit indicator light, an electric drive system fault light, a Ready indicator light, a high-voltage cut-off indicator light, a hazard warning flasher, and a text prompt display screen, all of which are connected to the vehicle controller.

[0054] The maintenance indicator, power limit indicator, electric drive system fault light, ready indicator, high-voltage cutoff indicator, hazard warning flashers, and text prompt display all support manual control, including user input commands through a human-machine interface (HMI). The HMI can directly use the text prompt display or a large onboard central control screen connected to the vehicle controller.

[0055] Specifically, the typical faults corresponding to the seven-level faults in this embodiment are as follows:

[0056] Level 1 faults include the electric drive system losing communication with the BMS and the TBOX;

[0057] Level 2 faults apply only to oil-cooled motors and include oil cooling system faults;

[0058] Level 3 faults include phase overcurrent warning; DC bus undervoltage, overvoltage, overtemperature warning; motor overspeed warning; temperature sensor sampling warning; torque monitoring warning; motor stall warning;

[0059] Level 4 faults include high voltage loop interlock faults and cover protection faults;

[0060] Level 5 faults only occur during the power-on self-test process and are not triggered during vehicle driving. This includes electric drive system initialization self-test faults.

[0061] Level 6 faults include phase overcurrent fault; DC bus undervoltage and overtemperature fault; motor overspeed fault; torque monitoring fault; voltage and power supply abnormality;

[0062] The seven-level faults include DC bus overvoltage fault, IGBT module fault, phase current sensor fault, motor position sensor fault, communication failure with the motor controller, and loss of communication with the vehicle controller.

[0063] Among them, the difference between a level 3 fault and a level 6 fault lies in the degree of the fault. In specific implementation, they can be distinguished by a two-level threshold (the first-level threshold is less than the second-level threshold). For example, if the phase current overcurrent value is greater than the first-level threshold, it is judged as a warning, corresponding to a level 3 fault; on this basis, if the phase current overcurrent value is also greater than the second-level threshold, it is judged as a fault, corresponding to a level 6 fault.

[0064] It should be noted that the detection of the above-mentioned fault levels belongs to the existing technology of those skilled in the art and will not be described in detail in this invention. Optionally, the number of fault level categories can also be flexibly adjusted by those skilled in the art according to specific implementation conditions. This embodiment is only a preferred embodiment.

[0065] Furthermore, based on the seven fault levels of this embodiment, this embodiment provides targeted differentiated handling measures to minimize the impact of drive system faults on vehicle functionality and driving safety. These measures primarily include: Level 1 faults execute a DTC (Disturbance Code) recording mode; Level 2 faults execute a maintenance prompt mode; Level 3 faults execute a power output limit mode; Level 4 faults execute a speed-linked power output mode; Level 5 faults execute a power-on prohibition mode; Level 6 faults execute a delayed power output prohibition mode; and Level 7 faults execute an immediate power output prohibition mode. Different modes perform different actions, illuminate different indicator lights and text prompts, and correspond to different fault recovery mechanisms, which are executed by the motor controller and vehicle controller, respectively.

[0066] In this embodiment, the fault handling operation of the motor controller for each level of fault includes:

[0067] For both level 1 and level 2 faults, the motor controller maintains the current state and records the DTC and the fault time data;

[0068] In case of level 3 fault, the motor controller controls the motor to limit power output, and records DTC and fault time data;

[0069] In the case of a level 4 fault, the motor controller controls the motor power output according to the current vehicle speed and records the DTC and the fault time data.

[0070] In case of level 5 fault, the motor controller prohibits the motor from outputting and records the DTC and the fault time data.

[0071] In case of level 6 fault, the motor controller controls the motor to limit power output within 5 seconds, prohibits output after 5 seconds, and records DTC and fault time data;

[0072] In case of level 7 fault, the motor controller immediately disables the motor output, records the DTC, and records the data at the time of the fault.

[0073] Among them, for level 4 faults, the vehicle is still in a controllable state when this type of fault occurs. The power-limited operation allows the vehicle to decelerate to a safe speed under control, avoiding the risk of rear-end collision or loss of control caused by sudden stops. If the output is prohibited at a safe speed, the risk source is directly cut off to ensure the safety of personnel contact. Therefore, during a level 4 fault, the motor controller controls the power output of the motor according to the current vehicle speed, including: if the current vehicle speed is greater than the preset vehicle speed threshold, the motor controller controls the motor to limit the power output until the vehicle speed drops to the preset vehicle speed threshold; if the current vehicle speed is less than or equal to the preset vehicle speed threshold, the motor controller controls the motor to prohibit output. The vehicle speed threshold of this embodiment is set to 3km / h, and can be flexibly selected according to actual conditions during specific implementation.

[0074] Level 5 faults only occur during the power-on self-test process when the vehicle itself is in a stationary state. At this time, in order to prevent safety problems caused by accidental starting of the vehicle, the motor power output is directly prohibited.

[0075] When a Level 6 fault occurs, directly disabling output will result in power interruption and the risk of high-speed stall. Therefore, fault handling first involves a short period of power output limitation to reduce vehicle speed to a certain extent, and then disabling motor power output to minimize the impact of the drive system fault on vehicle functionality and driving safety. When a Level 7 fault occurs, the vehicle is at risk of loss of control at any time. For example, IGBT module breakdown or bus capacitor overvoltage may cause a short circuit explosion. In this case, motor power output must be immediately disabled to protect user safety.

[0076] When a fault occurs, the motor controller processes the motor power according to the fault level. This embodiment also requires a simultaneous driver alert, providing information about the fault handling process. This facilitates timely fault resolution and improves the user experience. In this embodiment, the driver alert is achieved by the vehicle controller driving the vehicle instrumentation fault indication module. The vehicle controller also controls the vehicle's high-voltage power to assist in fault handling.

[0077] Specifically, corresponding to each level of fault handling operation of the motor controller, the fault handling operation of the vehicle controller of this embodiment for each level of fault includes:

[0078] Level 1 fault, the vehicle controller records DTC;

[0079] In case of a secondary fault, the vehicle controller lights up the maintenance indicator light and prompts "Electric drive system maintenance" through the text prompt display;

[0080] In case of level 3 fault, the vehicle controller lights up the power limit indicator light and displays a message "Electric drive system power limit" on the text display.

[0081] In the case of a level 4 fault, the vehicle controller controls the vehicle instrument fault indication module to give a prompt based on the current vehicle speed; if the current vehicle speed is greater than the preset speed threshold, the vehicle controller lights up the electric drive system fault light and displays an "electric drive system fault" prompt on the text prompt display until the vehicle speed drops to the preset speed threshold; if the current vehicle speed is less than or equal to the preset speed threshold, the vehicle controller lights up the electric drive system fault light and turns off the Ready indicator light. At the same time, the vehicle high voltage is cut off, the high voltage cut-off indicator light is lit, and the text prompt display shows "electric drive system fault".

[0082] In the case of a level 5 fault, the vehicle controller lights up the electric drive system fault indicator, turns off the Ready indicator, prohibits the vehicle from being powered on, and displays a text prompt indicating "electric drive system fault";

[0083] In case of a level 6 fault, the vehicle controller lights up the electric drive system fault indicator, the hazard warning lights, and a text prompt screen displays "Electric drive system fault, power cut off in 5 seconds." A timer starts, and the Ready indicator turns off after 5 seconds.

[0084] In the case of a Level 7 fault, the vehicle controller immediately illuminates the electric drive system fault indicator, turns on the hazard warning lights, turns off the Ready indicator, and displays a text message indicating "Electric Drive System Fault." The specific vehicle instrument panel fault indicator lights are shown in Table 1.

[0085]

[0086] Table 1

[0087] After the fault is resolved, the vehicle must be reset. In this embodiment, for Level 1, 3, 4, and 6 faults, the corresponding fault handling operations are automatically stopped and reset after the corresponding fault is resolved, reducing the user's operational burden. However, for Level 2, 5, and 7 faults, the corresponding fault handling operations must be manually stopped and reset after the corresponding fault is resolved. For a Level 2 fault, the user can manually reset the fault light and text prompt display after completing maintenance. For a Level 5 fault, the user can manually reset the fault light and text prompt display after the initial self-test fault is cleared by manually re-powering the vehicle. For a Level 7 fault, manual reset is required to ensure the fault is completely cleared and subsequent driving safety is guaranteed.

[0088] This embodiment also proposes a fault handling system for an electric vehicle drive system, using the above-mentioned fault handling method for an electric vehicle drive system, such as Figure 2 As shown, the system includes a fault detection module, a motor controller, a vehicle controller, and a vehicle instrument fault indication module connected in sequence; wherein,

[0089] The fault detection module is used to detect faults and send them to the motor controller; specifically, the vehicle automatic diagnostic system OBD can be used to detect the status of the electric drive system in real time. When a fault occurs, the system generates a standardized diagnostic trouble code DTC;

[0090] The motor controller is used to classify the current fault according to a preset fault level, which includes at least seven levels, and perform corresponding fault handling operations according to the corresponding fault level; the fault level is also sent to the vehicle controller;

[0091] The vehicle controller is used to perform corresponding fault handling operations according to the corresponding fault level, including driving the vehicle instrument fault indication module to provide fault prompts according to the corresponding fault level;

[0092] The vehicle instrument fault indication module includes a maintenance indicator light, a power limit indicator light, an electric drive system fault light, a ready indicator light, a high-voltage cut-off indicator light, a hazard warning flasher, and a text prompt display screen, all of which are connected to the vehicle controller.

[0093] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described method. Any non-substantial improvements made using the method concepts and technical solutions of the present invention, or any direct application of the above-described concepts and technical solutions to other situations without modification, fall within the scope of protection of the present invention.

Claims

1. A method for troubleshooting an electric vehicle drive system, characterized in that: The method comprises: Detect current faults in the electric drive system; The motor controller classifies the current fault according to a preset fault level, which includes at least seven levels, and performs corresponding fault handling operations according to the corresponding fault level; The fault level is also synchronized to the vehicle controller, and the vehicle controller executes corresponding fault handling operations according to the corresponding fault level, including driving the vehicle instrument fault indication module to provide a fault prompt according to the corresponding fault level; the vehicle instrument fault indication module includes a maintenance indicator light, a power limit indicator light, an electric drive system fault light, a Ready indicator light, a high-voltage cut-off indicator light, a hazard warning flasher, and a text prompt display screen.

2. The fault handling method of an electric vehicle drive system according to claim 1, characterized in that: Level 1 faults include the electric drive system losing communication with the BMS and the TBOX; Level 2 faults apply only to oil-cooled motors and include oil cooling system faults; Level 3 faults include phase overcurrent warning; DC bus undervoltage, overvoltage, overtemperature warning; motor overspeed warning; temperature sensor sampling warning; torque monitoring warning; motor stall warning; Level 4 faults include high voltage loop interlock faults and cover protection faults; Level 5 faults only occur during the power-on self-test process and are not triggered during vehicle driving. This includes electric drive system initialization self-test faults. Level 6 faults include phase overcurrent fault; DC bus undervoltage and overtemperature fault; motor overspeed fault; torque monitoring fault; voltage and power supply abnormality; The seven-level faults include DC bus overvoltage fault, IGBT module fault, phase current sensor fault, motor position sensor fault, communication failure with the motor controller, and loss of communication with the vehicle controller.

3. The fault handling method of an electric vehicle drive system according to claim 2, characterized in that: The motor controller's fault handling operations for each level of fault include: For both level 1 and level 2 faults, the motor controller maintains the current state and records the DTC and the fault time data; In case of level 3 fault, the motor controller controls the motor to limit power output, and records DTC and fault time data; In the case of a level 4 fault, the motor controller controls the motor power output according to the current vehicle speed and records the DTC and the fault time data. In case of level 5 fault, the motor controller prohibits the motor from outputting and records the DTC and the fault time data. In case of level 6 fault, the motor controller controls the motor to limit power output within 5 seconds, prohibits output after 5 seconds, and records DTC and fault time data; In case of level 7 fault, the motor controller immediately disables the motor output, records the DTC, and records the data at the time of the fault.

4. The method for troubleshooting an electric vehicle drive system according to claim 3, wherein: In the event of a level 4 fault, the motor controller controls the motor's power output according to the current vehicle speed, including: if the current vehicle speed is greater than the preset speed threshold, the motor controller controls the motor to limit power output until the vehicle speed drops to the preset speed threshold; if the current vehicle speed is less than or equal to the preset speed threshold, the motor controller controls the motor to prohibit output.

5. The method for troubleshooting an electric vehicle drive system according to claim 4, characterized in that: The vehicle controller's fault handling operations for each level of fault include: Level 1 fault, the vehicle controller records DTC; In case of a secondary fault, the vehicle controller lights up the maintenance indicator light and prompts "Electric drive system maintenance" on the text display screen; In case of a level 3 fault, the vehicle controller lights up the power limit indicator light and displays a text prompt indicating "Electric drive system power limit"; For level 4 faults, the vehicle controller controls the vehicle instrument fault indication module to give a prompt based on the current vehicle speed; In the case of a level 5 fault, the vehicle controller lights up the electric drive system fault indicator, turns off the Ready indicator, prohibits the vehicle from being powered on, and displays a text prompt indicating "electric drive system fault"; In case of a level 6 fault, the vehicle controller lights up the electric drive system fault indicator, the hazard warning lights, and a text prompt screen displays "Electric drive system fault, power cut off in 5 seconds." A timer starts, and the Ready indicator turns off after 5 seconds. In the event of a level 7 fault, the vehicle controller immediately turns on the electric drive system fault light, turns on the hazard warning lights, turns off the Ready indicator light, and displays an "electric drive system fault" text prompt on the display screen.

6. The method for troubleshooting an electric vehicle drive system according to claim 5, characterized in that: For level 4 faults, the vehicle controller controls the vehicle instrument fault indication module based on the current vehicle speed to provide prompts including: If the current vehicle speed is greater than the preset speed threshold, the vehicle controller will light up the electric drive system fault light and prompt "electric drive system fault" on the text prompt display until the vehicle speed drops to the preset speed threshold; if the current vehicle speed is less than or equal to the preset speed threshold, the vehicle controller will light up the electric drive system fault light and turn off the Ready indicator light. At the same time, it will cut off the high voltage of the vehicle, light up the high voltage cut-off indicator light, and prompt "electric drive system fault" on the text prompt display.

7. A fault handling method for an electric vehicle drive system according to any one of claims 4 to 6, characterized in that: The vehicle speed threshold is set to 3 km / h.

8. A fault handling method for an electric vehicle drive system according to any one of claims 2 to 6, characterized in that: For the level 1, 3, 4, and 6 faults, the corresponding fault handling operations are automatically stopped and reset after the corresponding faults are resolved; for the level 2, 5, and 7 faults, the corresponding fault handling operations need to be manually stopped and reset after the corresponding faults are resolved.

9. A fault handling system for an electric vehicle drive system, using the fault handling method for an electric vehicle drive system according to any one of claims 1 to 8, characterized in that: The system includes a fault detection module, a motor controller, a vehicle controller, and a vehicle instrument fault indication module connected in sequence; wherein, The fault detection module is used to detect faults and send them to the motor controller; The motor controller is used to classify the current fault according to a preset fault level, which includes at least seven levels, and perform corresponding fault handling operations according to the corresponding fault level; the fault level is also sent to the vehicle controller; The vehicle controller is used to perform corresponding fault handling operations according to the corresponding fault level, including driving the vehicle instrument fault indication module to provide fault prompts according to the corresponding fault level; The vehicle instrument fault indication module includes a maintenance indicator light, a power limit indicator light, an electric drive system fault light, a ready indicator light, a high-voltage cut-off indicator light, a hazard warning flasher, and a text prompt display screen, all of which are connected to the vehicle controller.

10. The fault handling system for an electric vehicle drive system according to claim 9, characterized in that: The fault detection module adopts the vehicle automatic diagnosis system OBD.

Images