Fault protection method, device and system for reduction gearbox of electric vehicle

Abstract

The invention provides a fault protection device for a reduction gearbox of an electric automobile, and belongs to the field of automobiles, the fault protection device comprises a monitoring unit and a strategy unit, the monitoring unit is used for obtaining state data of a gear shifting motor, the reduction gearbox and an electric drive assembly controller and judging whether a fault occurs or not; the strategy unit outputs control strategies of the gear shifting motor and the reduction gearbox to the electric drive assembly controller according to fault information of the monitoring unit and fault types, according to different faults of the gear shifting motor and the reduction gearbox in the reduction gearbox and different protection actions on the reduction gearbox, power is not cut off blindly, speed limiting is not conducted blindly, and the influence on drivability is reduced.

Description

Technical Field

[0001] This invention relates to the field of automotive technology, and in particular to a fault protection method, device, and system for a gearbox in an electric vehicle. Background Technology

[0002] As the market share of new energy vehicles increases, customer attention is increasingly focused on vehicle reliability and economy. Due to the high degree of electronic control integration in pure electric vehicles, blind and excessive protection when the electric drive assembly fails can reduce vehicle drivability. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art, and proposes a fault protection method, device and system for electric vehicle gearboxes.

[0004] In a first aspect, the present invention provides a fault protection device for an electric vehicle gearbox, comprising:

[0005] The monitoring unit is used to acquire status data of the shift motor, gearbox, and electric drive assembly controller, and to determine whether a fault has occurred.

[0006] The strategy unit outputs control strategies for the shift motor and gearbox to the electric drive assembly controller based on the fault information from the monitoring unit and the fault type.

[0007] In some embodiments, when the monitoring unit detects an abnormal power supply to the shift motor, the strategy unit outputs a shift-prohibition strategy to the electric drive assembly controller, and the electric drive assembly controller controls the shift motor to prevent it from switching gears.

[0008] In some embodiments, when the monitoring unit detects an abnormality in the position sensor signal of the shift motor, the strategy unit outputs a strategy to prohibit shifting and a gearbox self-learning strategy to the electric drive assembly controller. The electric drive assembly controller controls the shift motor to prohibit shifting gears and requests the gearbox to self-learn and decelerate to a set low speed.

[0009] In some of these embodiments,

[0010] The monitoring unit detects a fault in the drive chip of the shift motor.

[0011] Furthermore, when the electric drive assembly controller is not in the exact gear, the strategy unit outputs a speed limiting strategy to the electric drive assembly controller, and the electric drive assembly controller requests the reduction gearbox to decelerate to the set low speed.

[0012] Furthermore, when the electric drive assembly controller is not in neutral, the strategy unit outputs a speed limiting strategy to the electric drive assembly controller, and the electric drive assembly controller requests the reduction gearbox to decelerate to the set medium speed.

[0013] Furthermore, when the electric drive assembly controller is in neutral, the strategy unit outputs a power cut-off strategy to the electric drive assembly controller, and the electric drive assembly controller controls the power cut-off of the gearbox.

[0014] In some of these embodiments,

[0015] The monitoring unit detected a failure in the shift motor to engage or disengage gears.

[0016] Furthermore, when the electric drive assembly controller is not in neutral, the strategy unit outputs a strategy to prohibit gear shifting and reduce gearbox deceleration to the electric drive assembly controller. The electric drive assembly controller controls the shift motor to prohibit gear shifting and requests the reducer to decelerate to a set low speed.

[0017] Furthermore, when the electric drive assembly controller is in neutral, the strategy unit outputs a strategy to prohibit gear shifting and cut off power to the electric drive assembly controller, and the electric drive assembly controller controls the shift motor to prohibit gear shifting and cuts off power to the gearbox.

[0018] In some embodiments, when the monitoring unit detects a jamming fault in the shift motor, the strategy unit outputs a strategy to prohibit shifting and reduce gearbox deceleration to the electric drive assembly controller. The electric drive assembly controller controls the shift motor to prohibit shifting gears and requests the reducer to decelerate to a set low speed.

[0019] In some embodiments, when the monitoring unit detects that the gearbox has failed to learn, the strategy unit outputs a power cut-off strategy to the electric drive assembly controller, and the electric drive assembly controller controls the power cut-off of the gearbox.

[0020] In some embodiments, the monitoring unit detects a gearbox disengagement fault.

[0021] Furthermore, when the electric drive assembly controller is not in neutral, the strategy unit outputs a speed limiting strategy to the electric drive assembly controller, and the electric drive assembly controller requests the reduction gearbox to decelerate to a set low speed.

[0022] Furthermore, when the electric drive assembly controller is in neutral, the strategy unit outputs a power cut-off strategy to the electric drive assembly controller, and the electric drive assembly controller controls the power cut-off of the gearbox.

[0023] Secondly, the present invention also provides a fault protection method for an electric vehicle gearbox, applied to the aforementioned fault protection device, comprising the following steps:

[0024] Acquire status data of the shift motor, gearbox, and electric drive assembly controller;

[0025] Determine whether a fault has occurred based on the status data;

[0026] Based on the fault information, output the control strategy for the shift motor and gearbox;

[0027] The electric drive assembly controller controls the shift motor or gearbox according to the control strategy.

[0028] Thirdly, the present invention also provides a power system for an electric vehicle, including a drive motor, wheels, and the aforementioned fault protection device, wherein the drive motor drives the wheels through a reduction gearbox.

[0029] The present invention provides a fault protection device for an electric vehicle gearbox. The monitoring unit is used to acquire status data of the shift motor, gearbox, and electric drive assembly controller, and to determine whether a fault has occurred. The strategy unit outputs control strategies for the shift motor and gearbox to the electric drive assembly controller based on the fault information from the monitoring unit and the fault type. The present invention provides different protection actions for the gearbox according to different faults in the shift motor and gearbox, avoiding blindly cutting off power and limiting speed, thus reducing the impact on drivability. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the power system of the electric vehicle of the present invention, according to one embodiment;

[0031] Figure 2 This is a structural block diagram of the fault protection device for the electric vehicle gearbox of the present invention;

[0032] Figure 3 This is a schematic diagram illustrating the steps of an embodiment of the fault protection strategy for the electric vehicle gearbox of the present invention;

[0033] Figure 4 This is a schematic diagram of a structure of an embodiment of the fault protection method for the electric vehicle gearbox of the present invention;

[0034] Figure 5 This is a schematic diagram of the structure of an embodiment of the electronic device of the present invention. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solutions of the present invention, exemplary embodiments of the present invention are described below in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0036] Where there is no conflict, the various embodiments of the present invention and the features thereof may be combined with each other.

[0037] As used herein, the term “and / or” includes any and all combinations of one or more related enumerated entries.

[0038] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used herein, the singular forms “a” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that when the terms “comprising” and / or “made of” are used in this specification, the presence of the stated feature, integral, step, operation, element, and / or component is specified, but the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof is not excluded. Terms such as “connected” or “linked” are not limited to physical or mechanical connections but can include electrical connections, whether direct or indirect.

[0039] Unless otherwise specified, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having the meaning consistent with their meaning in the context of the relevant art and the invention, and will not be interpreted as having an idealized or overly formal meaning unless expressly so defined herein.

[0040] In the technical solution of this invention, the collection, storage, use, processing, transmission, provision, and disclosure of user personal information all comply with relevant laws and regulations and do not violate public order and good morals. The use of user data in this technical solution follows relevant national laws and regulations (e.g., the "Information Security Technology - Personal Information Security Specification"). For example: appropriate measures are taken for personal information access control; restrictions are imposed on the display of personal information; the purpose of using personal information does not exceed the scope of direct or reasonable association; and explicit identity targeting is eliminated when using personal information to avoid precisely locating a specific individual.

[0041] See Figure 1 as well as Figure 2 This invention provides a fault protection device for an electric vehicle gearbox: a monitoring unit and a strategy unit. The monitoring unit acquires status data of the shift motor, gearbox, and electric drive assembly controller, and determines whether a fault has occurred. The strategy unit outputs control strategies for the shift motor and gearbox to the electric drive assembly controller based on the fault information from the monitoring unit and the fault type. The specific implementation of each component is described in detail below.

[0042] MTCU (Electric Drive Unit Controller): As the core of the system, it is responsible for controlling the drive motor EM1 and the shift motor, monitoring the status of the entire system, and executing fault protection strategies.

[0043] Drive motor EM1: Provides power and transmits torque to the gearbox via the input shaft.

[0044] Gear shifting motor: Controlled by MTCU, it drives the synchronizer to move left and right to achieve gear switching (such as forward, neutral, reverse).

[0045] Gearbox: Includes input shaft, synchronizer, output shaft, and differential. Power is transmitted from the input shaft to the output shaft via the synchronizer, and then distributed to the wheels via the differential.

[0046] Wheels: The final drive components that receive power from the differential.

[0047] As is understandable, when the system is working, the MTCU controls the drive motor and shift motor according to the driver's needs (such as accelerator pedal input, gear shift commands) to achieve power transmission and gear changes. In case of a fault, the MTCU will trigger the corresponding protection mode according to the fault type to ensure vehicle safety.

[0048] Under normal circumstances, the system operates as follows:

[0049] Step 1: System power-on initialization

[0050] After the MTCU is powered on, it performs a self-test and initialization, including checking the shift motor position sensor, drive motor status, and gearbox gear position. If no faults are found, the system enters standby mode.

[0051] Step 2: Gear selection and shifting

[0052] The MTCU receives shift commands from the driver (e.g., via the shift lever) and controls the rotation of the shift motor. The shift motor drives a synchronizer on the input shaft via a mechanical linkage or gears, engaging different gears to switch gears (e.g., 1st gear, 2nd gear, or neutral). A high-precision position sensor provides real-time feedback on the shift motor's position, ensuring the synchronizer is accurately positioned.

[0053] Step 3: Power Transmission

[0054] Once the gear shift is complete, the MTCU controls the drive motor EM1 to output torque. Power is transmitted to the differential via the input shaft, synchronizer, and output shaft. The differential distributes power to the left and right wheels, driving the vehicle.

[0055] Step 4: Continuous monitoring

[0056] The MTCU continuously monitors parameters such as the position of the shift motor, the status of the drive motor, and the power supply voltage to ensure stable system operation. If an anomaly is detected, it immediately enters fault handling mode.

[0057] Please refer to the room. Figure 3 The flowchart of the fault protection strategy provided by the present invention specifically includes the following steps:

[0058] 1. Power supply abnormality

[0059] Faulty component: Power supply to the shift motor (such as a 12V / 24V low-voltage power network).

[0060] Specifically, the MTCU detects that the power supply voltage of the shift motor is too low or unstable through its internal power monitoring circuit.

[0061] Specifically, when the monitoring unit detects an abnormal power supply to the shift motor, the strategy unit outputs a shift-prohibition strategy to the electric drive assembly controller, and the electric drive assembly controller controls the shift motor to prevent it from switching gears.

[0062] Understandably, the MTCU immediately stops sending any pulse commands to the shift motor driver chip. Since the shift motor loses its power source, it cannot operate, and the synchronizer is fixed in its current position, thus preventing gear shifting.

[0063] It should be noted that the vehicle will remain in the current gear or will fail to start (if the malfunction occurs before starting).

[0064] 2. High-precision position sensor malfunction

[0065] Specifically, the shift motor has a built-in position sensor (such as a rotary transformer or encoder).

[0066] When the monitoring unit detects an abnormality in the position sensor signal of the shift motor, the strategy unit outputs a strategy to prohibit shifting and a gearbox self-learning strategy to the electric drive assembly controller. The electric drive assembly controller controls the shift motor to prohibit shifting gears and requests the gearbox to self-learn and decelerate to a set low speed.

[0067] Understandably, if the sensor signal is lost or abnormal, the MTCU cannot know the real-time position of the shift motor and synchronizer, and the gear status becomes "unknown".

[0068] The specific protective actions are as follows:

[0069] Disallow shifting: MTCU locks the shifting command to prevent blind shifting when the position is unknown, which could cause damage to the synchronizer and gears.

[0070] Request for self-learning: The MTCU controls the shift motor to perform a predefined, small-range reciprocating motion, attempting to recalibrate key positions such as "neutral" through current changes or other auxiliary sensors (such as motor back EMF). However, this learning is likely to fail due to the failure of the main sensor.

[0071] Allowing for low-speed driving: To prevent the vehicle from breaking down immediately, the MTCU limits the output power and speed of the drive motor (EM1), allowing the vehicle to "crawl" to a safe location at a very low speed (e.g., 8 kph). This is based on a conservative strategy: even if the gear is not ideal, the low torque and low speed can avoid serious damage to the gearbox.

[0072] 3. Faulty component of the shift motor driver chip: the shift motor driver chip on the MTCU board.

[0073] Specifically, the monitoring unit detects a fault in the drive chip of the shift motor, and when the electric drive assembly controller is not in a specific gear, the strategy unit outputs a speed limiting strategy to the electric drive assembly controller, which requests the gearbox to decelerate to a set low speed; when the electric drive assembly controller is not in neutral, the strategy unit outputs a speed limiting strategy to the electric drive assembly controller, which requests the gearbox to decelerate to a set medium speed; and when the electric drive assembly controller is in neutral, the strategy unit outputs a power cut-off strategy to the electric drive assembly controller, which controls the power cut-off of the gearbox.

[0074] Specifically, when the driver chip fails, the MTCU cannot control the shift motor, and its position is unknown.

[0075] Protection action: MTCU prohibits gear shifting (command cannot be executed).

[0076] Tiered protection: The MTCU protects the gearbox and vehicle based on the last known and reliable gear position stored before the fault occurred.

[0077] Condition a) Not in gear: The MTCU determines that the synchronizer is not fully engaged. Forcing power transmission at this time will cause gear grinding. The MTCU strongly limits the speed and torque of EM1, keeping the vehicle speed below 8 kph, barely allowing it to move.

[0078] Condition b) Non-neutral: The MTCU determines that the synchronizer has been engaged in a driving gear (such as 1st gear). At this time, the powertrain is connected, but to avoid uncertain risks, the MTCU limits the power output of EM1 so that the vehicle speed does not exceed 30kph, and the vehicle can travel at low to medium speeds.

[0079] Condition c) Neutral: The MTCU determines that the synchronizer is in neutral. The output shaft is disconnected from the input shaft, and power cannot be transmitted. The MTCU directly cuts off the torque output request to EM1, and the vehicle cannot move.

[0080] 4. Failure to shift gears

[0081] The monitoring unit detects a failure in shifting the gear motor to engage or disengage gears. When the electric drive assembly controller is not in neutral, the strategy unit outputs a strategy to prohibit gear shifting and a reduction gearbox deceleration strategy to the electric drive assembly controller. The electric drive assembly controller then controls the shifting motor to prohibit gear shifting and requests the reduction gearbox to decelerate to a set low speed. When the electric drive assembly controller is in neutral, the strategy unit outputs a strategy to prohibit gear shifting and a power cut-off strategy to the electric drive assembly controller. The electric drive assembly controller then controls the shifting motor to prohibit gear shifting and cuts off power to the reduction gearbox.

[0082] For example: faulty components: shift motor, synchronizer, or related mechanical transmission mechanism (such as shift fork).

[0083] Specifically, during the gear shifting process, the MTCU commands the shifting motor to move, but the high-precision position sensor feedback shows that the synchronizer has failed to reach the target position (for example, due to synchronizer gear ring locking or mechanical jamming).

[0084] Protection action: MTCU prohibits gear shifting and commands the gear shifting motor to stop and remain in this position.

[0085] Tiered protection: At this point, the MTCU knows for certain that the system is "not in the exact gear".

[0086] Operating condition a) Not in gear: This is the most common situation. The MTCU limits the EM1 output to achieve low-speed (8kph) crawling.

[0087] Operating condition b) Neutral: If the failure occurs when attempting to engage neutral, the MTCU cuts off power to EM1.

[0088] 5. Gear shift motor jamming fault

[0089] Faulty component: The shift motor itself or its mechanical transmission parts are physically jammed.

[0090] When the monitoring unit detects a jamming fault in the shift motor, the strategy unit outputs a strategy to prohibit shifting and reduce gearbox deceleration to the electric drive assembly controller. The electric drive assembly controller controls the shift motor to prohibit shifting gears and requests the reducer to decelerate to a set low speed.

[0091] Specifically, after the MTCU detects that the command has been issued, the shift motor current increases sharply (attempting to overcome resistance) but the position remains unchanged (as indicated by feedback from the position sensor).

[0092] Protection action: The MTCU immediately stops driving the shift motor to prevent it from burning out and prohibits subsequent shifting.

[0093] Since jamming usually occurs during gear shifting, the MTCU status is "out of gear". Therefore, the MTCU uniformly requests to limit the vehicle speed to a low speed (8kph) to allow the vehicle to move a short distance.

[0094] 6. Gearbox self-learning failed.

[0095] The root cause of the fault is that the system cannot establish a correspondence between the position of the shift motor and the gear position of the synchronizer / gearbox.

[0096] When the monitoring unit detects that the gearbox has failed to learn, the strategy unit outputs a power cut-off strategy to the electric drive assembly controller, and the electric drive assembly controller controls the power cut-off of the gearbox.

[0097] Specifically, when the vehicle starts or recovers from a fault, the MTCU executes a self-learning process: controlling the shift motor to move and finding the synchronizer's limit position and neutral point. If the expected result is not achieved due to mechanical resistance, abnormal sensor readings, or other reasons, it is considered a failure.

[0098] Protective Action: This is one of the most serious malfunctions because the MTCU is completely "blind" to the internal state of the gearbox. Any power output could cause severe impacts to the synchronizer and gears. Therefore, the MTCU takes the most conservative approach: immediately and completely cutting off power to the gearbox, i.e., prohibiting EM1 from outputting any torque. The vehicle cannot move.

[0099] 7. Gearbox disengagement failure

[0100] Faulty component: Inside the gearbox, usually the synchronizer locking mechanism is worn or malfunctioning, causing it to unexpectedly disengage from the gear position while driving.

[0101] The monitoring unit detected a gearbox disengagement fault.

[0102] Furthermore, when the electric drive assembly controller is not in neutral, the strategy unit outputs a speed limiting strategy to the electric drive assembly controller, and the electric drive assembly controller requests the reduction gearbox to decelerate to a set low speed.

[0103] Furthermore, when the electric drive assembly controller is in neutral, the strategy unit outputs a power cut-off strategy to the electric drive assembly controller, and the electric drive assembly controller controls the power cut-off of the gearbox.

[0104] Specifically, the MTCU detects that the synchronizer has disengaged by the mismatch between the output shaft speed sensor and the input shaft (EM1) speed, or by the unexpected change in the shift motor position sensor.

[0105] Graded protection: The MTCU provides protection based on the actual position of the synchronizer after the gear is disengaged.

[0106] Operating condition a) Not in gear: The synchronizer remains between two gears. The protection strategy is the same as before, limiting low-speed creep.

[0107] Operating condition b) Neutral: The synchronizer has just slipped into the neutral position. The protection strategy is to cut off the power to EM1.

[0108] It is understood that this embodiment integrates the control of the drive motor and shift motor through the MTCU to achieve efficient power transmission and gear shifting. In case of a fault, the MTCU adopts a graded protection strategy based on the fault type, such as prohibiting gear shifting, limiting speed, or cutting off power, to ensure vehicle safety and system reliability. All protection logic is based on real-time sensor data and predefined operating conditions, thereby minimizing the impact of faults on vehicle operation. This design is suitable for electric drive systems of electric vehicles or hybrid vehicles, improving system robustness and user experience.

[0109] The present invention provides a fault protection device for an electric vehicle gearbox. The monitoring unit is used to acquire status data of the shift motor, gearbox, and electric drive assembly controller, and to determine whether a fault has occurred. The strategy unit outputs control strategies for the shift motor and gearbox to the electric drive assembly controller based on the fault information from the monitoring unit and the fault type. The present invention provides different protection actions for the gearbox according to different faults in the shift motor and gearbox, avoiding blindly cutting off power and limiting speed, thus reducing the impact on drivability.

[0110] Please see Figure 4 The present invention also provides a fault protection method for an electric vehicle gearbox. Applied to the fault protection device for the electric vehicle gearbox provided in the above embodiments, it specifically includes:

[0111] S1. Obtain status data of the shift motor, gearbox, and electric drive assembly controller.

[0112] MTCU (Electric Drive Unit Controller): As the core of the system, it is responsible for controlling the drive motor EM1 and the shift motor, monitoring the status of the entire system, and executing fault protection strategies.

[0113] Drive motor EM1: Provides power and transmits torque to the gearbox via the input shaft.

[0114] Gear shifting motor: Controlled by MTCU, it drives the synchronizer to move left and right to achieve gear switching (such as forward, neutral, reverse).

[0115] Gearbox: Includes input shaft, synchronizer, output shaft, and differential. Power is transmitted from the input shaft to the output shaft via the synchronizer, and then distributed to the wheels via the differential.

[0116] Wheels: The final drive components that receive power from the differential.

[0117] As is understandable, when the system is working, the MTCU controls the drive motor and shift motor according to the driver's needs (such as accelerator pedal input, gear shift commands) to achieve power transmission and gear changes. In case of a fault, the MTCU will trigger the corresponding protection mode according to the fault type to ensure vehicle safety.

[0118] S2. Determine whether a fault has occurred based on the status data.

[0119] For example, if the MTCU detects that the power supply voltage of the shift motor is too low or unstable through its internal power monitoring circuit, it indicates a power supply abnormality fault.

[0120] If the sensor signal is lost or abnormal, and the MTCU cannot know the real-time position of the shift motor and synchronizer, then the high-precision position sensor is faulty.

[0121] If the driver chip of the shift motor fails and the MTCU cannot control the shift motor, then the shift motor driver chip is faulty.

[0122] During gear shifting, the MTCU commands the shifting motor to operate, but the high-precision position sensor feedback indicates that the synchronizer has failed to reach the target position, which is a gear shifting failure fault.

[0123] If the MTCU detects that after the command is issued, the shift motor current increases sharply (attempting to overcome resistance) but the position does not change (as indicated by the position sensor), then the shift motor is stuck.

[0124] If the system cannot establish the correspondence between the position of the shift motor and the gear position of the synchronizer / gearbox, it is a gearbox self-learning failure fault.

[0125] S3. Output the control strategy for the shift motor and gearbox based on the fault information.

[0126] Specifically, when the monitoring unit detects an abnormal power supply to the shift motor, the strategy unit outputs a shift-prohibition strategy to the electric drive assembly controller, and the electric drive assembly controller controls the shift motor to prevent it from switching gears.

[0127] When the monitoring unit detects an abnormality in the position sensor signal of the shift motor, the strategy unit outputs a strategy to prohibit shifting and a gearbox self-learning strategy to the electric drive assembly controller. The electric drive assembly controller controls the shift motor to prohibit shifting gears and requests the gearbox to self-learn and decelerate to a set low speed.

[0128] When the monitoring unit detects a fault in the drive chip of the shift motor, and when the electric drive assembly controller is not in the correct gear, the strategy unit outputs a speed limiting strategy to the electric drive assembly controller, which requests the gearbox to decelerate to a set low speed. When the electric drive assembly controller is not in neutral, the strategy unit outputs a speed limiting strategy to the electric drive assembly controller, which requests the gearbox to decelerate to a set medium speed. When the electric drive assembly controller is in neutral, the strategy unit outputs a power cut-off strategy to the electric drive assembly controller, which controls the power cut-off of the gearbox.

[0129] When the monitoring unit detects a failure to engage or disengage gears in the shift motor, and the electric drive assembly controller is not in neutral, the strategy unit outputs a strategy to prohibit shifting and a reduction gearbox deceleration strategy to the electric drive assembly controller. The electric drive assembly controller then controls the shift motor to prohibit shifting gears and requests the reduction gearbox to decelerate to a set low speed. Conversely, when the electric drive assembly controller is in neutral, the strategy unit outputs a strategy to prohibit shifting gears and a power cut-off strategy to the electric drive assembly controller. The electric drive assembly controller then controls the shift motor to prohibit shifting gears and cuts off power to the reduction gearbox.

[0130] When the monitoring unit detects a jamming fault in the shift motor, the strategy unit outputs a strategy to prohibit shifting and reduce gearbox deceleration to the electric drive assembly controller. The electric drive assembly controller controls the shift motor to prohibit shifting gears and requests the reducer to decelerate to a set low speed.

[0131] When the monitoring unit detects that the gearbox has failed to learn, the strategy unit outputs a power cut-off strategy to the electric drive assembly controller, and the electric drive assembly controller controls the power cut-off of the gearbox.

[0132] S4. The electric drive assembly controller controls the shift motor or gearbox to operate according to the control strategy.

[0133] When a fault occurs, the shift motor usually needs to be prohibited from shifting gears, while the gearbox cuts off power or controls the gearbox to decelerate to the set speed (set to low speed or set to medium speed).

[0134] It is understood that this embodiment integrates the control of the drive motor and shift motor through the MTCU to achieve efficient power transmission and gear shifting. In case of a fault, the MTCU adopts a graded protection strategy based on the fault type, such as prohibiting gear shifting, limiting speed, or cutting off power, to ensure vehicle safety and system reliability. All protection logic is based on real-time sensor data and predefined operating conditions, thereby minimizing the impact of faults on vehicle operation. This design is suitable for electric drive systems of electric vehicles or hybrid vehicles, improving system robustness and user experience.

[0135] Based on the same inventive concept, see [link to inventive concept] Figure 1 The present invention also provides a power system for an electric vehicle, including a drive motor, wheels, and the aforementioned fault protection device, wherein the drive motor drives the wheels through a reduction gearbox. In this embodiment, the aforementioned fault protection device is applied to the power system of an electric vehicle, thereby enabling the MTCU to adopt a graded protection strategy according to the fault type in the event of a fault, such as prohibiting gear shifting, limiting speed, or cutting off power, to ensure vehicle safety and system reliability.

[0136] Based on the same inventive concept, embodiments of the present invention also provide an electronic device. Figure 5 This is a structural block diagram of an electronic device provided in an embodiment of the present invention. Figure 5 As shown, an embodiment of the present invention provides an electronic device including: one or more processors 101, a memory 102, and one or more I / O interfaces 103. The memory 102 stores one or more programs, which, when executed by the one or more processors, cause the one or more processors to implement a fault protection method for any of the electric vehicle gearboxes described in the above embodiments; the one or more I / O interfaces 103 are connected between the processor and the memory, configured to enable information interaction between the processor and the memory.

[0137] The processor 101 is a device with data processing capabilities, including but not limited to a central processing unit (CPU); the memory 102 is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), and flash memory (FLASH); the I / O interface (read / write interface) 103 is connected between the processor 101 and the memory 102, and can realize information interaction between the processor 101 and the memory 102, including but not limited to a data bus (Bus).

[0138] In some embodiments, the processor 101, memory 102, and I / O interface 103 are interconnected via bus 104, and thus connected to other components of the computing device.

[0139] In some embodiments, the one or more processors 101 include a field-programmable gate array.

[0140] This invention also provides a computer-readable medium. The computer-readable medium stores a computer program, which, when executed by a processor, implements the steps in any of the fault protection methods for electric vehicle gearboxes described in the above embodiments. The computer-readable storage medium may be volatile or non-volatile.

[0141] This invention also provides a computer program product, including computer-readable code, or a non-volatile computer-readable storage medium carrying computer-readable code. When the computer-readable code is run in the processor of an electronic device, the processor in the electronic device executes the above-described fault protection method for the electric vehicle gearbox.

[0142] Those skilled in the art will understand that all or some of the steps, systems, and apparatuses disclosed above, and their functional modules / units, can be implemented as software, firmware, hardware, or suitable combinations thereof. In hardware implementations, the division between functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed collaboratively by several physical components. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit (ASIC). Such software can be distributed on a computer-readable storage medium, which may include computer storage media (or non-transitory media) and communication media (or transient media).

[0143] As is known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable program instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), static random access memory (SRAM), flash memory or other memory technologies, portable compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, it is known to those skilled in the art that communication media typically contain computer-readable program instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0144] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0145] The computer program instructions used to perform the operations of this invention may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing state information from the computer-readable program instructions. This electronic circuitry can execute the computer-readable program instructions to implement various aspects of the invention.

[0146] The computer program product described herein can be implemented specifically through hardware, software, or a combination thereof. In one alternative embodiment, the computer program product is specifically embodied in a computer storage medium; in another alternative embodiment, the computer program product is specifically embodied in a software product, such as a software development kit (SDK), etc.

[0147] Various aspects of the present invention are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-readable program instructions.

[0148] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that, when executed by the processor of the computer or other programmable data processing apparatus, they create means for implementing the functions / actions specified in one or more blocks of the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium that causes a computer, programmable data processing apparatus, and / or other device to operate in a particular manner; thus, the computer-readable medium storing the instructions comprises an article of manufacture that includes instructions for implementing aspects of the functions / actions specified in one or more blocks of the flowchart and / or block diagram.

[0149] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to perform the functions / actions specified in one or more boxes of a flowchart and / or block diagram.

[0150] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of an instruction, which contains one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0151] Example embodiments have been disclosed herein, and while specific terminology has been used, it is for illustrative purposes only and should be construed as such, and is not intended to be limiting. In some instances, it will be apparent to those skilled in the art that features, characteristics, and / or elements described in conjunction with particular embodiments may be used alone, or in combination with features, characteristics, and / or elements described in conjunction with other embodiments, unless otherwise expressly indicated. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the scope of the invention as set forth in the appended claims.

Claims

1. A fault protection device for an electric vehicle gearbox, characterized in that, It includes: The monitoring unit is used to acquire status data of the shift motor, gearbox, and electric drive assembly controller, and to determine whether a fault has occurred. The strategy unit outputs control strategies for the shift motor and gearbox to the electric drive assembly controller based on the fault information from the monitoring unit and the fault type.

2. The fault protection device for the electric vehicle gearbox according to claim 1, characterized in that, When the monitoring unit detects an abnormal power supply to the shift motor, the strategy unit outputs a shift-prohibition strategy to the electric drive assembly controller, and the electric drive assembly controller controls the shift motor to prevent it from switching gears.

3. The fault protection device for the electric vehicle gearbox according to claim 1, characterized in that, When the monitoring unit detects an abnormality in the position sensor signal of the shift motor, the strategy unit outputs a strategy to prohibit shifting and a gearbox self-learning strategy to the electric drive assembly controller. The electric drive assembly controller controls the shift motor to prohibit shifting gears and requests the gearbox to self-learn and decelerate to a set low speed.

4. The fault protection device for the electric vehicle gearbox according to claim 1, characterized in that, The monitoring unit detects a fault in the drive chip of the shift motor. Furthermore, when the electric drive assembly controller is not in the exact gear, the strategy unit outputs a speed limiting strategy to the electric drive assembly controller, and the electric drive assembly controller requests the reduction gearbox to decelerate to the set low speed. Furthermore, when the electric drive assembly controller is not in neutral, the strategy unit outputs a speed limiting strategy to the electric drive assembly controller, and the electric drive assembly controller requests the reduction gearbox to decelerate to the set medium speed. Furthermore, when the electric drive assembly controller is in neutral, the strategy unit outputs a power cut-off strategy to the electric drive assembly controller, and the electric drive assembly controller controls the power cut-off of the gearbox.

5. The fault protection device for the electric vehicle gearbox according to claim 1, characterized in that, The monitoring unit detected a failure in the shift motor to engage or disengage gears. Furthermore, when the electric drive assembly controller is not in neutral, the strategy unit outputs a strategy to prohibit gear shifting and reduce gearbox deceleration to the electric drive assembly controller. The electric drive assembly controller controls the shift motor to prohibit gear shifting and requests the reducer to decelerate to a set low speed. Furthermore, when the electric drive assembly controller is in neutral, the strategy unit outputs a strategy to prohibit gear shifting and cut off power to the electric drive assembly controller, and the electric drive assembly controller controls the shift motor to prohibit gear shifting and cuts off power to the gearbox.

6. The fault protection device for the electric vehicle gearbox according to claim 1, characterized in that, When the monitoring unit detects a jamming fault in the shift motor, the strategy unit outputs a strategy to prohibit shifting and reduce gearbox deceleration to the electric drive assembly controller. The electric drive assembly controller controls the shift motor to prohibit shifting gears and requests the reduction gearbox to decelerate to a set low speed.

7. The fault protection device for the electric vehicle gearbox according to claim 1, characterized in that, When the monitoring unit detects that the gearbox has failed to learn, the strategy unit outputs a power cut-off strategy to the electric drive assembly controller, and the electric drive assembly controller controls the power cut-off of the gearbox.

8. The fault protection device for the electric vehicle gearbox according to claim 1, characterized in that, The monitoring unit detected a gearbox disengagement fault. Furthermore, when the electric drive assembly controller is not in neutral, the strategy unit outputs a speed limiting strategy to the electric drive assembly controller, and the electric drive assembly controller requests the reduction gearbox to decelerate to a set low speed. Furthermore, when the electric drive assembly controller is in neutral, the strategy unit outputs a power cut-off strategy to the electric drive assembly controller, and the electric drive assembly controller controls the power cut-off of the gearbox.

9. A fault protection method for an electric vehicle gearbox, characterized in that, The fault protection device according to any one of claims 1-8 comprises the following steps: Acquire status data of the shift motor, gearbox, and electric drive assembly controller; Determine whether a fault has occurred based on the status data; Based on the fault information, output the control strategy for the shift motor and gearbox; The electric drive assembly controller controls the shift motor or gearbox according to the control strategy.

10. A power system for an electric vehicle, comprising a drive motor and wheels, characterized in that, It also includes a fault protection device as described in any one of claims 1-8, wherein the drive motor drives the wheels through a reduction gearbox.

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