Troubleshooting methods and devices for vehicle front axle motor disconnection device

Abstract

This application discloses a method and apparatus for handling faults in a vehicle front axle motor disconnection device. The method includes: obtaining the fault type of the disconnection device, which is used to switch the vehicle's driving mode; processing the fault according to a first preset strategy when the fault type is a first type, the first type of fault being determined by receiving a fault signal sent by the disconnection device; and processing the fault according to a second preset strategy when the fault type is a second type, the second type of fault being identified by a main control unit. The first preset strategy is used to handle faults occurring during the execution of a target operation by the disconnection device, the target operation including at least two operations: engagement and disengagement. This application at least solves the technical problem of low efficiency in handling faults in the disconnection device of a four-wheel drive electric vehicle.

Description

Technical Field

[0001] This application relates to the field of vehicle fault handling, and more specifically, to a method and apparatus for handling faults in a vehicle front axle motor disconnection device. Background Technology

[0002] With the continuous development of electric vehicles, four-wheel drive electric vehicles have gradually appeared on the market. Four-wheel drive pure electric vehicles offer superior power performance, providing users with an ultimate driving experience. However, users have diverse actual usage scenarios; different scenarios require different driving modes, placing different demands on pure electric vehicles, such as two-wheel drive and four-wheel drive modes. Currently, a disconnect device is used to switch driving modes, but in actual use, if the disconnect device malfunctions, it cannot be detected and addressed in a timely manner. Summary of the Invention

[0003] This application provides a method and apparatus for handling faults in the front axle motor disconnection device of a vehicle, so as to at least solve the technical problem of low efficiency in handling faults in the disconnection device of a four-wheel drive electric vehicle.

[0004] According to one aspect of the embodiments of this application, a method for handling faults in a vehicle front axle motor disconnection device is provided, comprising: obtaining a fault type of the disconnection device, the disconnection device being used to switch the vehicle's driving mode; when the fault type is a first type of fault, processing according to a first preset strategy, the first type of fault being determined by receiving a fault signal sent by the disconnection device; when the fault type is a second type of fault, processing according to a second preset strategy, the second type of fault being identified by a main control unit, wherein the first preset strategy is used to handle faults that occur in the disconnection device during the execution of a target operation, the target operation including at least: a combination operation and a separation operation.

[0005] Optionally, if the fault type is a first type of fault, the fault is handled according to a first preset strategy, including: if the fault type is a combined operation fault in the first type of fault, the main control unit controls the torque loaded on the front axle motor to be reduced to zero at a preset frequency; the main control unit controls the torque value loaded on the front axle motor to vary according to a first preset period, so that the disconnecting device completes the separation action and is in the separated state; if the disconnecting device is in the separated state, the speed of the front axle motor is adjusted to a first preset speed, and then the front axle motor is turned off.

[0006] Optionally, after shutting down the front axle motor, the method further includes: not controlling the disconnect device to engage during a driving cycle in which a fault in the disconnect device is detected, wherein the driving cycle is used to characterize the time period from power-on start to power-off stop of the vehicle.

[0007] Optionally, if the fault type is a first type of fault, the fault is handled according to a first preset strategy, including: if the fault type is a separation operation fault in the first type of fault, the main control unit controls the front axle motor to load zero torque, so that the vehicle is in two-wheel drive mode, and continuously sends separation commands to the disconnection device to control the disconnection device to complete the separation operation.

[0008] Optionally, the step of handling the fault according to the second preset strategy when the fault type is the second type of fault includes: when the fault type is the gear disengagement fault in the second type of fault, controlling the torque of the front axle motor to be cleared to zero within a preset time period by the main control unit, and controlling the disconnecting device to complete the separation operation and be in the separated state; when the disconnecting device is in the separated state, controlling the disconnecting device to stop performing the engagement operation and adjusting the speed of the front axle motor to the first preset speed.

[0009] Optionally, the step of processing according to the second preset strategy when the fault type is the second type of fault includes: when the fault type is the top tooth fault in the second type of fault, the feedforward torque value loaded by the front axle motor is controlled by the main control unit to increase the target torque value according to the second preset cycle, and the target torque value is increased according to the preset frequency; after the top tooth fault of the disconnecting device is repaired, the target torque value is removed according to the preset frequency.

[0010] Optionally, the gear disengagement fault is determined by the following method: if the difference between the speed of the front axle motor and the target speed is greater than a second preset speed, the disconnection device is determined to be in a gear disengagement fault, wherein the target speed is obtained by converting the wheel speed connected to the front axle motor into the motor speed.

[0011] According to another aspect of the embodiments of this application, a fault handling device for a vehicle front axle motor disconnection device is also provided, comprising: an acquisition module, configured to acquire the fault type of the disconnection device, the disconnection device being used to switch the driving mode of the vehicle; a first determination module, configured to process the fault according to a first preset strategy when the fault type is a first type of fault, the first type of fault being determined by receiving a fault signal sent by the disconnection device; and a second determination module, configured to process the fault according to a second preset strategy when the fault type is a second type of fault, the second type of fault being identified by a main control unit, wherein the first preset strategy is used to handle faults that occur in the disconnection device during the execution of a target operation, the target operation including at least: a combination operation and a separation operation.

[0012] According to another aspect of the embodiments of this application, a vehicle is also provided, including: a main control unit, the main control unit being used to execute the above-described vehicle front axle motor disconnection device fault handling method.

[0013] According to another aspect of the embodiments of this application, a non-volatile storage medium is also provided, the non-volatile storage medium including a stored program, wherein, when the program is executed, the device where the non-volatile storage medium is located is controlled to perform the above-described vehicle front axle motor disconnection device fault handling method.

[0014] In this embodiment, the fault type of the disconnection device is obtained. The disconnection device is used to switch the driving mode of the vehicle. When the fault type is a first type of fault, it is processed according to a first preset strategy. The first type of fault is determined by receiving a fault signal sent by the disconnection device. When the fault type is a second type of fault, it is processed according to a second preset strategy. The second type of fault is identified by the main control unit. The first preset strategy is used to handle faults that occur when the disconnection device performs a target operation. The target operation includes at least: combining operation and separation operation. The fault type of the disconnection device is obtained through different detection methods. Then, different fault handling strategies are determined according to different fault types to handle the faults. This achieves the purpose of accurately detecting fault types and quickly adapting to different fault type handling strategies, thereby improving the technical effect of fault handling efficiency and solving the technical problem of low fault handling efficiency of the disconnection device in four-wheel drive electric vehicles. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0016] Figure 1 This is a hardware structure block diagram of a computer terminal (or mobile device) for a fault handling method of a vehicle front axle motor disconnection device according to an embodiment of this application.

[0017] Figure 2 This is a flowchart illustrating a fault handling method for a vehicle front axle motor disconnection device according to this application.

[0018] Figure 3 This is a schematic diagram of an optional four-wheel drive electric vehicle according to an embodiment of this application;

[0019] Figure 4 This is a schematic flowchart of an optional first type of fault handling method according to an embodiment of this application;

[0020] Figure 5This is a schematic flowchart of an optional gear slippage fault handling method according to an embodiment of this application;

[0021] Figure 6 This is a schematic diagram of an optional vehicle front axle motor disconnection device fault handling device according to an embodiment of this application. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present application.

[0023] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0024] According to an embodiment of this application, an embodiment of a method for handling faults in a vehicle front axle motor disconnection device is also provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0025] The methods and embodiments provided in this application can be executed on mobile terminals, computer terminals, or similar computing devices. Figure 1 A hardware block diagram of a computer terminal (or mobile device) for implementing a fault handling method for a vehicle front axle motor disconnection device is shown. Figure 1As shown, the computer terminal 10 (or mobile device 10) may include one or more processors 102 (shown as 102a, 102b, ..., 102n in the figure) 102 (processor 102 may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.), a memory 104 for storing data, and a transmission module 106 for communication functions. In addition, it may also include: a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of the I / O interface), a network interface, a power supply, and / or a camera. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the aforementioned electronic device. For example, computer terminal 10 may also include... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0026] It should be noted that the aforementioned one or more processors 102 and / or other data processing circuits are generally referred to herein as "data processing circuits". These data processing circuits may be embodied, in whole or in part, in software, hardware, firmware, or any other combination thereof. Furthermore, the data processing circuits may be a single, independent processing module, or may be integrated, in whole or in part, into any other element within the computer terminal 10 (or mobile device). As involved in the embodiments of this application, the data processing circuits serve as a processor control mechanism (e.g., selection of a variable resistor termination path connected to an interface).

[0027] The memory 104 can be used to store software programs and modules of application software, such as the program instructions / data storage device corresponding to the vehicle front axle motor disconnection device fault handling method in this embodiment of the application. The processor 102 executes various functional applications and data processing by running the software programs and modules stored in the memory 104, thereby realizing the aforementioned vehicle front axle motor disconnection device fault handling method. The memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the computer terminal 10 via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0028] The transmission module 106 is used to receive or send data via a network. Specific examples of the network described above may include a wireless network provided by the communication provider of the computer terminal 10. In one example, the transmission module 106 includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission module 106 may be a Radio Frequency (RF) module, used for wireless communication with the Internet.

[0029] The display can be, for example, a touchscreen liquid crystal display (LCD) that allows the user to interact with the user interface of the computer terminal 10 (or mobile device).

[0030] According to an embodiment of this application, an embodiment of a method for handling faults in a vehicle front axle motor disconnection device is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0031] Figure 2 This is a flowchart of a vehicle front axle motor disconnection device fault handling method according to an embodiment of this application, such as... Figure 2 As shown, the method includes the following steps:

[0032] Step S202: Obtain the fault type of the disconnect device, which is used to switch the vehicle's driving mode;

[0033] Step S204: If the fault type is a first type of fault, the first preset strategy is followed. The first type of fault is determined by receiving a fault signal sent by the disconnection device.

[0034] Step S206: In the case of a second type of fault, the fault is handled according to the second preset strategy. The second type of fault is identified by the main control unit. The first preset strategy is used to handle faults that occur in the disconnection device during the execution of the target operation. The target operation includes at least: a combination operation and a separation operation.

[0035] Figure 3 A schematic diagram of the drive structure of a four-wheel drive electric vehicle is shown, such as... Figure 3As shown, the drive motor closer to the front axle can be the front axle motor. One optional disconnect device is a dog clutch-type disconnect device. After the disconnect device completes its engagement operation, it is in the engaged state, and the vehicle is driven by both drive motors, which is a four-wheel drive mode. After the disconnect device completes its disengagement operation, it is in the disengaged state, and the vehicle is driven by the drive motor closer to the rear axle, which is a two-wheel drive mode. It can be understood that when the vehicle's torque demand is low, the dog clutch between the front motor reducer assembly and the front axle disengages. The vehicle control unit calculates the required torque and sends it to the rear motor via the CAN bus. The rear motor then provides the drive torque to reduce energy consumption; in this case, the vehicle is in two-wheel drive mode. When the vehicle's torque demand is high, the dog clutch engages, and the vehicle is driven by both the front and rear motors, which is a four-wheel drive mode.

[0036] It should be noted that the faults of the disconnecting device are mainly divided into assembly mechanical faults (when the main control unit issues a disconnecting or engaging command, the disconnecting device receives the command and performs a separation or engaging operation. During the operation, if the position of the disconnecting device's canine tooth cannot reach the target position for separation or engagement within a specified time, an assembly mechanical fault will be reported), assembly sensor faults, and faults identified by the main control unit (faults identified by the main control unit include at least: faults that the disconnecting device does not report mechanical / sensor faults but are identified by the main control unit in actual working conditions by judging abnormal states).

[0037] Through the above steps, it is possible to obtain the fault type of the disconnection device, which is used to switch the driving mode of the vehicle; when the fault type is a first type of fault, it is processed according to a first preset strategy, which is determined by receiving a fault signal sent by the disconnection device; when the fault type is a second type of fault, it is processed according to a second preset strategy, which is identified by the main control unit. The first preset strategy is used to handle faults that occur when the disconnection device performs a target operation, which includes at least: combining operation and separation operation. The fault type of the disconnection device is obtained through different detection methods, and different fault handling strategies are determined according to different fault types to handle the fault. This achieves the purpose of accurately detecting fault types and quickly adapting to different fault type handling strategies, thereby improving the technical effect of fault handling efficiency and solving the technical problem of low fault handling efficiency of the disconnection device in four-wheel drive electric vehicles.

[0038] It should also be noted that the main control unit is an important component of the automotive electronic control system, and its function is to control and manage all subsystems and functions of the entire vehicle.

[0039] Steps S202 to S206 are described in detail below through examples.

[0040] In some embodiments of this application, when the fault type is a first type of fault, the process is handled according to a first preset strategy, including: when the fault type is a coupling operation fault in the first type of fault, the main control unit controls the torque loaded on the front axle motor to be reduced to zero at a preset frequency; the main control unit controls the torque value loaded on the front axle motor to vary according to a first preset period, so that the disconnecting device completes the separation action and is in a separated state; when the disconnecting device is in the separated state, the speed of the front axle motor is adjusted to a first preset speed, and then the front axle motor is turned off. Wherein, after the front axle motor is turned off, the disconnecting device is no longer controlled to perform coupling operation within the driving cycle in which the disconnecting device fault is detected, wherein the driving cycle is used to characterize the time period from vehicle power-on start to power-off stop.

[0041] Specifically, if the fault cannot be reconnected, the main control unit can control the disconnection device to initiate the separation process, such as... Figure 4 As shown, it includes:

[0042] Step 1: The front axle motor drive torque is reset to zero at a preset frequency;

[0043] Step 2: The main control unit issues a disconnect command to control the disconnect device to perform the separation operation, and the torque value loaded on the front axle motor changes according to the first preset periodic torque (periodic small torque) T. 辅助脱开 (T 辅助脱开 For periodic oscillating torques, such as 1 Nm, 2 Nm, and 3 Nm, to assist the disconnection device in separation operations;

[0044] Step 3: When the disconnection device is in the disconnected state, the front axle motor adjusts the motor speed to the first preset speed, and then the front axle motor is turned off.

[0045] Step 4: During the driving cycle in which the disconnect device malfunctions as described in this discovery, no further engagement requests will be attempted (no more engagement commands will be sent). In the next driving cycle, if the malfunction is resolved, engagement requests will be attempted again.

[0046] It should be noted that the first preset speed can be set according to the actual scenario, for example, the minimum speed at which the back electromotive force generated after the power is turned off will not damage the high-voltage circuit and the battery.

[0047] In some embodiments of this application, when the fault type is a separation operation fault in the first type of fault, the main control unit controls the front axle motor to load zero torque, so that the vehicle is in two-wheel drive mode, and continuously sends separation commands to the disconnection device to control the disconnection device to complete the separation operation.

[0048] It should be noted that the disconnect command is used to instruct the disconnect device to complete the disconnection operation. After the disconnection operation is completed, the vehicle is in two-wheel drive mode.

[0049] After completing steps 1, 2, and 3 of the separation process, as follows: Figure 4 As shown, if the disconnecting device fails to confirm whether the separation operation has been completed within the specified time, the main control unit determines that the separation operation has failed and directly switches from the separation mode to the two-wheel drive mode. In the two-wheel drive mode, the torque of the front axle motor is kept at zero and the motor is not shut off. The main control unit continues to send disconnecting commands to the disconnecting device (the disconnecting device attempts to continue responding to the disconnecting command of the main control unit to determine whether the fault can be eliminated).

[0050] Within the current driving cycle (the driving cycle in which the fault was detected), no further engagement operation will be attempted (the disconnect device must continue to respond to the main control unit's disconnect command to determine if the fault can be eliminated). In the next driving cycle, if the fault is eliminated and the disconnect device is in a disengaged state, engagement operation will be attempted again.

[0051] It should be noted that if a mechanical fault is detected in the assembly indicating an abnormality in the contact position of the disconnect device or in the torque transmission capability, the four-wheel drive mode can be deactivated to prevent the abnormal contact position and torque transmission from causing the motor speed to exceed the second preset speed and to prevent damage to the contact.

[0052] It should also be noted that the disconnection device has not confirmed whether the separation operation has been completed, including the following three situations: 1. When the position sensor is not faulty, it is determined that the disconnection device has not reached the position specified for the separation operation; 2. Signal communication failure; 3. Position sensor failure.

[0053] It is understandable that sensor failures and solenoid valve control failures can both be classified as Category I failures.

[0054] In some embodiments of this application, the step of processing according to a second preset strategy when the fault type is a second type of fault includes: when the fault type is a gear disengagement fault in the second type of fault, controlling the torque of the front axle motor to be zero within a preset time period through the main control unit, and controlling the disconnecting device to complete the separation operation and be in the separated state; when the disconnecting device is in the separated state, controlling the disconnecting device to stop performing the engagement operation and adjusting the speed of the front axle motor to a first preset speed.

[0055] Specifically, when the vehicle is traveling on a bumpy road, the disconnect device may experience a disengagement fault (the front and rear parts of the disconnect device's engagement part separate), causing the front axle motor to rotate too fast. If the disconnect device attempts to re-engage, the front and rear parts of the engagement part will collide and be damaged. In this case, the main control unit needs to identify in four-wheel drive mode that the difference between the front axle motor's rotation speed and the target rotation speed is greater than a second preset rotation speed to determine that the disconnect device is experiencing a disengagement fault. The target rotation speed is obtained by converting the rotation speed of the wheel connected to the front axle motor into the motor's rotation speed.

[0056] In one alternative approach, the disconnector being in a disengagement fault can be determined by the following method:

[0057] The front axle motor speed n when the drive torque is applied 电机转速 With wheel speed n 轮速 The difference between the target speed and the motor speed (converted to the motor side) is greater than the second preset speed.

[0058] It should be noted that in four-wheel drive mode, the front axle motor self-locks via a disconnect device, and its speed is approximately equal to that of the wheels.

[0059] Specifically, |n 电机转速 -n 轮速 *r 主减速比 The second preset speed is considered to be a failure to engage gears (gear disengagement failure).

[0060] Understandably, r 主减速比 The final drive ratio is the ratio of the front axle motor speed to the wheel speed. It can be determined by the ratio of the number of teeth on the front axle motor gear to the number of teeth on the wheel gear. Alternatively, it can be determined by the ratio of the diameter of the front axle motor gear to the diameter of the wheel gear.

[0061] Handling measures for detecting a disconnection device in a disengaged state, such as... Figure 5 As shown, it includes:

[0062] Step 1: First, the front axle motor drive torque is immediately and quickly reset to zero. At the same time, the main control unit issues a disconnect command to prevent the disconnect device from performing the engagement operation again, thus preventing tooth breakage (collision between the front and rear parts of the engagement).

[0063] In one alternative approach, considering the communication delay between the main control unit and the disconnection device, the disconnection device can proactively identify the fault and prevent the connection operation from being performed in advance.

[0064] Step 2: After the disconnection device is in the disengagement state, the front motor speed adjustment will adjust the motor speed to the first preset speed, and then the front axle motor will be turned off, and no re-engagement request will be attempted during this driving cycle.

[0065] Step 3: The main control unit accumulates the number of identified gear disengagement faults. When the accumulated number is greater than or equal to the first preset number (e.g., 3 times), it is considered that there is an unidentified mechanical / sensor fault in the disconnection device and it is processed as an unrecoverable fault.

[0066] In some embodiments of this application, the step of processing according to a second preset strategy when the fault type is a second type of fault includes: when the fault type is a top tooth fault in the second type of fault, the feedforward torque value loaded by the front axle motor controlled by the main control unit is increased by a target torque value according to a second preset cycle, and the target torque value is increased according to the preset frequency; after the top tooth fault of the disconnecting device is repaired, the target torque value is removed according to the preset frequency.

[0067] Specifically, when the disconnect device responds to the engagement command from the main control unit, a tooth-pinch phenomenon (tooth-pinch failure) occurs, which increases the time required to complete the engagement operation. In actual application scenarios, tooth-pinch failure will cause the time to switch from two-wheel drive mode to four-wheel drive mode to be longer.

[0068] The handling measures for tooth malfunction are as follows: When a tooth malfunction is detected, based on the front axle motor speed control, the feedforward torque value is periodically increased by an offset ΔT (target torque value, gradually increased to the target torque value according to a preset frequency) while the tooth is in the tooth malfunction state. When it is detected that the disconnecting device is not in the tooth malfunction state, the target torque value is removed.

[0069] It should be noted that the target torque value is the minimum torque required to overcome the top tooth. It needs to be calibrated based on the actual wheel speed or vehicle speed. Gradually increasing the target torque value at a preset frequency is to ensure a smooth transition of the superimposed target torque value.

[0070] After the above processing, the tooth-ejecting time is greatly shortened, ensuring that the time from receiving the engagement command to the completion of engagement by the disconnecting device is within the target time t. 结合 The target duration for the internal combination is calculated by subtracting the allowable duration for the front axle motor to adjust its speed from the specified duration for switching from two-wheel drive mode to four-wheel drive mode. For example, 0.15 seconds.

[0071] Understandably, the specified duration and the allowable duration for adjusting the rotation speed can be set according to the actual scenario.

[0072] In one optional approach, the main control unit identifies a tooth-collision phenomenon and determines that the engagement operation takes longer than a second preset time after the tooth-collision operation is detected. If the number of tooth-collision failures exceeds a second preset number, for example, 20 times, the main control unit considers that there is an unknown mechanical fault in the disconnection device. This fault affects the driving experience but does not affect the normal engagement and disengagement requirements. In this case, the main control unit stores the corresponding fault code and issues a fault alert.

[0073] The vehicle front axle motor disconnection device fault handling provided in this application embodiment is also applied to a vehicle front axle motor disconnection device fault handling device provided in this application embodiment, such as... Figure 6 As shown, it includes: an acquisition module 60, used to acquire the fault type of the disconnection device, the disconnection device being used to switch the driving mode of the vehicle; a first determination module 62, used to process according to a first preset strategy when the fault type is a first type of fault, the first type of fault being determined by receiving a fault signal sent by the disconnection device; and a second determination module 64, used to process according to a second preset strategy when the fault type is a second type of fault, the second type of fault being identified by the main control unit, wherein the first preset strategy is used to handle faults that occur in the disconnection device during the execution of a target operation, the target operation including at least: a combination operation and a separation operation.

[0074] The first determining module 62 includes: a first processing submodule and a second processing submodule. The first processing submodule is used to, in the case of a combined operation fault in the first type of fault, control the torque loaded on the front axle motor to be reduced to zero at a preset frequency by the main control unit; control the torque value loaded on the front axle motor to vary according to a first preset period by the main control unit so that the disconnecting device completes the separation action and is in the separation state; and when the disconnecting device is in the separation state, adjust the speed of the front axle motor to a first preset speed and then turn off the front axle motor.

[0075] The first processing submodule includes: a control unit, which is configured to stop controlling the disconnect device to perform engagement operations during a driving cycle in which a fault of the disconnect device is detected, wherein the driving cycle is used to characterize the time period from when the vehicle is powered on to when it is powered off.

[0076] The second processing submodule is used to control the front axle motor to load zero torque through the main control unit when the fault type is a separation operation fault in the first type of fault, so that the vehicle is in two-wheel drive mode, and continuously send separation commands to the disconnection device to control the disconnection device to complete the separation operation.

[0077] The second determining module 64 includes a third processing submodule and a fourth processing submodule; it is used to control the torque of the front axle motor to be zero within a preset time period through the main control unit when the fault type is a disengagement fault in the second type of fault, and to control the disconnecting device to complete the separation operation and be in the separated state; when the disconnecting device is in the separated state, it controls the disconnecting device to stop performing the engagement operation and adjusts the speed of the front axle motor to a first preset speed.

[0078] The third processing submodule includes: when the fault type is a top tooth fault in the second type of fault, the main control unit controls the feedforward torque value loaded by the front axle motor to increase the target torque value according to a second preset cycle, and the target torque value increases according to the preset frequency; after the top tooth fault of the disconnecting device is repaired, the target torque value is removed according to the preset frequency.

[0079] The fourth processing submodule is used to determine that the disconnection device is in a disengagement fault when the difference between the speed of the front axle motor and the target speed is greater than the second preset speed, wherein the target speed is obtained by converting the wheel speed connected to the front axle motor into the motor speed.

[0080] According to another aspect of the embodiments of this application, a vehicle is also provided, including: a main control unit, the main control unit being used to execute the above-described vehicle front axle motor disconnection device fault handling method.

[0081] According to another aspect of the embodiments of this application, a non-volatile storage medium is also provided, including a stored program, wherein, when the program runs, the device where the non-volatile storage medium is located executes the above-described vehicle front axle motor disconnection device fault handling method. The program includes: obtaining the fault type of the disconnection device, the disconnection device being used to switch the vehicle's driving mode; when the fault type is a first type of fault, processing according to a first preset strategy, the first type of fault being determined by receiving a fault signal sent by the disconnection device; when the fault type is a second type of fault, processing according to a second preset strategy, the second type of fault being identified by a main control unit, wherein the first preset strategy is used to handle faults that occur when the disconnection device performs a target operation, the target operation including at least: a combination operation and a separation operation.

[0082] By obtaining the fault type of the disconnection device through different detection methods, and then determining different fault handling strategies according to different fault types, the faults are handled. This achieves the goal of accurately detecting fault types and quickly adapting to different fault type handling strategies, thereby improving the technical effect of fault handling efficiency and solving the technical problem of low fault handling efficiency of the disconnection device in four-wheel drive electric vehicles.

[0083] According to another aspect of the embodiments of this application, a computer device is also provided, including a memory, a processor, and a vehicle front axle motor disconnection device fault handling method program stored in the memory and executable on the processor. When the processor executes the program, it implements the above-described vehicle front axle motor disconnection device fault handling method.

[0084] The aforementioned computer device is used to store and execute programs for the following functions: obtaining the fault type of the disconnecting device, which is used to switch the driving mode of the vehicle; in the case that the fault type is a first type of fault, processing according to a first preset strategy, wherein the first type of fault is determined by receiving a fault signal sent by the disconnecting device; in the case that the fault type is a second type of fault, processing according to a second preset strategy, wherein the second type of fault is identified by the main control unit, wherein the first preset strategy is used to handle faults that occur in the disconnecting device during the execution of a target operation, wherein the target operation includes at least: a joining operation and a disengagement operation.

[0085] By obtaining the fault type of the disconnection device through different detection methods, and then determining different fault handling strategies according to different fault types, the faults are handled. This achieves the goal of accurately detecting fault types and quickly adapting to different fault type handling strategies, thereby improving the technical effect of fault handling efficiency and solving the technical problem of low fault handling efficiency of the disconnection device in four-wheel drive electric vehicles.

[0086] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0087] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0088] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between units or modules may be electrical or other forms.

[0089] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0090] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0091] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard drive, magnetic disk, or optical disk.

[0092] The above are merely preferred embodiments of this application. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A vehicle front axle motor disconnect device failure handling method characterized by, The method comprises: acquiring a fault type of a disconnecting device used to switch a driving mode of a vehicle; in a case where the fault type is a first type of fault, processing according to a first preset strategy, the first type of fault being determined by receiving a fault signal sent by the disconnecting device; in a case where the fault type is a second type of fault, processing according to a second preset strategy, the second type of fault being identified by a master control unit, wherein the first preset strategy is used to process a fault occurring in a target operation of the disconnecting device, and the target operation at least includes a combination operation and a separation operation; in a case where the fault type is the first type of fault, processing according to the first preset strategy, comprising: in a case where the fault type is a combination operation fault in the first type of fault, controlling, by the master control unit, a torque loaded by a front axle motor to decrease to zero according to a preset frequency; controlling, by the master control unit, a torque value of the front axle motor to change according to a torque of a first preset period, so that the disconnecting device completes a separation action and is in a separation state; adjusting, in a case where the disconnecting device is in the separation state, a rotating speed of the front axle motor to a first preset rotating speed, and then shutting down the front axle motor; the processing according to the second preset strategy in a case where the fault type is the second type of fault, comprising: in a case where the fault type is a top tooth fault in the second type of fault, controlling, by the master control unit, a feedforward torque value loaded by the front axle motor to increase a target torque value according to a second preset period, the target torque value increasing according to a preset frequency; after the top tooth fault of the disconnecting device is repaired, removing the target torque value according to the preset frequency.

2. The method of claim 1, wherein, after the front axle motor is shut down, the method further comprises: not controlling the disconnecting device to perform the combination operation within a driving cycle in which the disconnecting device is found to be faulty, wherein the driving cycle is used to represent a period from power-on starting to power-off stopping of the vehicle.

3. The method of claim 1, wherein, in a case where the fault type is the first type of fault, processing according to the first preset strategy, comprising: in a case where the fault type is a separation operation fault in the first type of fault, controlling, by the master control unit, the front axle motor to load zero torque, so that the vehicle is in a two-wheel drive mode, and continuously sending a separation instruction to the disconnecting device to control the disconnecting device to complete the separation operation.

4. The method of claim 1, wherein, the processing according to the second preset strategy in a case where the fault type is the second type of fault, comprising: in a case where the fault type is a drop-off fault in the second type of fault, controlling, by the master control unit, a torque of the front axle motor to be zero within a preset time length, and controlling the disconnecting device to complete a separation operation and be in a separation state; in a case where the disconnecting device is in the separation state, controlling the disconnecting device to stop performing the combination operation and adjusting a rotating speed of the front axle motor to a first preset rotating speed.

5. The method of claim 4, wherein, the drop-off fault is determined by the following method, comprising: In a case where a difference between the rotation speed of the front axle motor and a target rotation speed is greater than a second preset rotation speed, it is determined that the disconnect device is in a disengagement failure, wherein the target rotation speed is obtained by converting a wheel rotation speed connected with the front axle motor into a motor rotation speed.

6. A vehicle front axle motor disconnect device failure handling device characterized by, The method comprises the following steps: An acquisition module is configured to acquire a fault type of a disconnect device, the disconnect device being configured to switch a driving mode of a vehicle. A first determination module is configured to, in a case where the fault type is a first type of fault, process according to a first preset strategy, the first type of fault being determined by receiving a fault signal sent by the disconnect device. A second determination module is configured to, in a case where the fault type is a second type of fault, process according to a second preset strategy, the second type of fault being identified by a master control unit, wherein the first preset strategy is configured to process a fault occurring in a process of performing a target operation by the disconnect device, and the target operation at least includes a combination operation and a separation operation. In the case where the fault type is the first type of fault, processing according to the first preset strategy comprises the following steps: In a case where the fault type is a combination operation fault in the first type of fault, a torque loaded by a front axle motor is controlled by the master control unit to decrease to zero according to a preset frequency. A torque loaded by the front axle motor is controlled by the master control unit to change according to a torque with a first preset period, so that the disconnect device completes a separation action and is in a separation state. In the case where the disconnect device is in the separation state, a rotation speed of the front axle motor is adjusted to a first preset rotation speed, and then the front axle motor is shut down. In the case where the fault type is the second type of fault, processing according to the second preset strategy comprises the following steps: In a case where the fault type is a tooth fault in the second type of fault, a feedforward torque value loaded by the front axle motor is controlled by the master control unit to increase a target torque value according to a second preset period, and the target torque value is increased according to a preset frequency. After the tooth fault of the disconnect device is repaired, the target torque value is removed according to the preset frequency.

7. A vehicle characterized by comprising: The method comprises the following steps: A master control unit is configured to execute the vehicle front axle motor disconnect device fault processing method according to any one of claims 1 to 5.

8. A non-volatile storage medium, comprising: The non-volatile storage medium comprises a stored program, wherein when the program is running, the device in which the non-volatile storage medium is located is controlled to execute the vehicle front axle motor disconnect device fault processing method according to any one of claims 1 to 5.

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