Control method and device of disconnection mechanism and storage medium

Abstract

The invention provides a control method and device of a disconnection mechanism and a storage medium. The control method comprises the steps that the motor temperature corresponding to an auxiliary motor is detected through a motor control unit; when the disconnection mechanism is switched from the disconnection state to the connection state, whether the disconnection mechanism is successfully connected or not is detected through a disconnection mechanism control unit; when the motor temperature is lower than a first preset temperature threshold value and the disconnection mechanism is not successfully combined, the current state of the disconnection mechanism is obtained through a disconnection mechanism control unit; according to the current state, a target heating strategy and a target control unit are determined, and the auxiliary motor is heated through the target control unit according to the target heating strategy; and when the motor temperature is greater than a second preset temperature threshold value, controlling the target control unit to stop heating the auxiliary motor. Different heating measures can be taken according to different states of the disconnecting mechanism, so that the auxiliary motor recovers to the normal working temperature as soon as possible, and the reliability of a vehicle power system in a low-temperature environment is improved.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to a control method, device and storage medium of a disconnect mechanism. Background Art

[0002] At present, pure electric four-wheel drive vehicles usually use a power form that combines a front drive motor and a rear drive motor, in which the front drive motor is an auxiliary motor. In order to achieve the best economy, a disconnect mechanism control unit (Actuator Control Unit for Electrical Axle Actuator, ACU) is set between the front drive motor and the front axle to selectively connect or disconnect the power transmission between the front drive motor and the front axle through the ACU, control the front drive motor to perform auxiliary drive, or stop auxiliary drive, to meet the different driving needs of the vehicle, and to minimize the energy loss generated by the drive motor under high-speed rotation, thereby improving the economy of the whole vehicle. Among them, when the ACU controls the disconnect mechanism to switch from the disconnected state to the coupled state, the front drive motor needs to be adjusted to the same speed as the wheel-end reduction box before it can be coupled.

[0003] However, when the front drive motor is at an extremely low temperature, the low temperature will reduce the available torque of the motor, affect the speed regulation rate of the motor, cause the disconnect mechanism state switching to fail, and thus affect the power of the entire vehicle. Summary of the invention

[0004] The embodiments of the present application provide a control method, device and storage medium for a disconnect mechanism to solve the problem of how to perform fault recovery on a state switching failure of a disconnect mechanism caused by low temperature.

[0005] In a first aspect, an embodiment of the present application provides a control method for a disconnect mechanism, which is applied to a control system, wherein the control system includes a disconnect mechanism control unit, a motor control unit, and a vehicle control unit; the disconnect mechanism is arranged between the auxiliary motor and the front axle, and the method includes:

[0006] Detecting the motor temperature corresponding to the auxiliary motor by the motor control unit;

[0007] When the disconnection mechanism switches from the disconnected state to the engaged state, the disconnection mechanism control unit detects whether the disconnection mechanism is successfully engaged;

[0008] When the temperature of the motor is lower than a first preset temperature threshold and the disconnection mechanism is not successfully engaged, obtaining a current state of the disconnection mechanism through the disconnection mechanism control unit, wherein the current state includes a disconnection state and a partially engaged state;

[0009] According to the current state, a target heating strategy and a target control unit for executing the target heating strategy are determined, and the auxiliary motor is heated according to the target heating strategy by the target control unit; wherein the target control unit is one of the motor control unit and the vehicle control unit;

[0010] When the motor temperature is greater than a second preset temperature threshold, controlling the target control unit to stop heating the auxiliary motor;

[0011] Among them, when the disconnection mechanism is in the disconnection state, the auxiliary motor and the front axle are disengaged; when the disconnection mechanism is in the engagement state, the auxiliary motor and the front axle are engaged; when the disconnection mechanism is in the partial engagement state, the auxiliary motor and the front axle are partially engaged; the second preset temperature threshold is higher than the first preset temperature threshold.

[0012] In a second aspect, an embodiment of the present application further provides a control device for a disconnect mechanism, which is applied to a control system, wherein the control system includes a disconnect mechanism control unit, a motor control unit, and a vehicle control unit; the disconnect mechanism is arranged between the auxiliary motor and the front axle, and the device includes:

[0013] A first detection module, used for detecting a motor temperature corresponding to the auxiliary motor through the motor control unit;

[0014] A second detection module, used for detecting whether the disconnection mechanism is successfully engaged through the disconnection mechanism control unit when the disconnection mechanism is switched from the disconnection state to the engagement state;

[0015] A first acquisition module, configured to acquire a current state of the disconnection mechanism through the disconnection mechanism control unit when the temperature of the motor is lower than a first preset temperature threshold and the disconnection mechanism is not successfully engaged, wherein the current state includes a disconnection state and a partially engaged state;

[0016] A first processing module, configured to determine a target heating strategy and a target control unit for executing the target heating strategy according to the current state, and heat the auxiliary motor according to the target heating strategy through the target control unit; wherein the target control unit is one of the motor control unit and the vehicle control unit;

[0017] A second processing module, configured to control the target control unit to stop heating the auxiliary motor when the motor temperature is greater than a second preset temperature threshold;

[0018] Among them, when the disconnection mechanism is in the disconnection state, the auxiliary motor and the front axle are disengaged; when the disconnection mechanism is in the engagement state, the auxiliary motor and the front axle are engaged; when the disconnection mechanism is in the partial engagement state, the auxiliary motor and the front axle are partially engaged; the second preset temperature threshold is higher than the first preset temperature threshold.

[0019] In a third aspect, an embodiment of the present application further provides an electronic device, which includes a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the computer program implements the above-mentioned control method of the disconnection mechanism when executed by the processor.

[0020] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the control method of the disconnection mechanism described above is implemented.

[0021] The embodiments of the present application include at least the following technical effects:

[0022] The technical solution of the embodiment of the present application is to obtain the current state of the disconnection mechanism when the motor temperature corresponding to the auxiliary motor is lower than the first preset temperature threshold and the disconnection mechanism fails to switch from the disconnected state to the engaged state, and determine the target heating strategy and the target control unit according to the current state, and heat the auxiliary motor according to the target heating strategy through the target control unit, and at the same time, detect the motor temperature during the heating process, and stop heating the auxiliary motor when the motor temperature is greater than the second preset temperature threshold. Effective heating measures can be taken for different disconnection mechanism states to restore the auxiliary motor to normal operating temperature as soon as possible, ensure that the disconnection mechanism can be smoothly switched to the engaged state later, ensure the normal operation of the four-wheel drive system, and improve the reliability of the vehicle power system in low temperature environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0024] Figure 1 It is one of the flow charts of the control method of the disconnection mechanism provided in the embodiment of the present application;

[0025] Figure 2 This is the second flow chart of the control method of the disconnection mechanism provided in the embodiment of the present application;

[0026] Figure 3 is a schematic structural diagram of a control device for a disconnect mechanism provided in an embodiment of the present application;

[0027] Figure 4 A block diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0030] In the various embodiments of the present application, it should be understood that the size of the serial numbers of the following processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0031] At present, pure electric four-wheel drive vehicles usually use a power form that combines a front drive motor and a rear drive motor, in which the front drive motor is an auxiliary motor. A disconnect mechanism and a disconnect mechanism control unit (Actuator Control Unit for Electrical Axle Actuator, ACU) are set between the front drive motor and the front axle. When it is necessary to accelerate quickly to overtake or drive on a steep slope, the disconnect mechanism is controlled by the ACU to combine the front drive motor with the front axle, so that the vehicle can obtain a stronger power output. Correspondingly, when the vehicle is driving at low speeds or other working conditions that do not require the auxiliary motor to work, the disconnect mechanism is controlled by the ACU to mechanically disconnect the front drive motor from the front axle to avoid energy consumption and improve the economy of the whole vehicle.

[0032] In the related art, the disconnection mechanism includes two gears, N gear and 1 gear. Among them, N gear corresponds to the disconnected state, at this time, the power transmission path between the auxiliary motor and the wheel-end reduction gearbox is cut off, that is, the auxiliary motor is disconnected from the front axle, and the auxiliary motor is in a free state and does not provide power to the vehicle's drive system. 1 gear corresponds to the engaged state, at this time, the auxiliary motor is connected to the wheel-end reduction gearbox, that is, the auxiliary motor is engaged with the front axle, and the power of the auxiliary motor can be effectively transmitted to the wheels, thereby participating in the vehicle's driving process and providing additional power support.

[0033] When the disconnect mechanism switches from N gear to 1 gear, the auxiliary motor needs to be adjusted to the same speed as the wheel-end reduction gearbox before it can be engaged. If the motor speed is inconsistent with the wheel-end reduction gearbox speed, a huge impact will be generated at the moment of engagement, resulting in collision between gears, which may damage gears, clutches and other components in severe cases. By adjusting the speed to make the two speeds the same, it can ensure that the power can be transmitted smoothly during the engagement process, reduce damage to the vehicle's transmission system, and also improve driving comfort.

[0034] However, in the extremely low temperatures in the north in winter, the viscosity of the lubricant increases due to the low temperature, and the thermal expansion and contraction of metal parts will also change the fit clearance between the parts, and the mechanical friction coefficient of the motor will decrease. Because the torque output of the motor depends on the friction between the mechanical parts to transmit power, when the friction decreases, the effective torque output capacity of the motor will also decrease. At the same time, the resistance of the motor winding will also decrease due to the decrease in temperature. When the voltage remains unchanged, the decrease in resistance will lead to an increase in current. Since there is a certain relationship between the speed of the motor and the electromagnetic torque and power, when the power remains unchanged and the torque decreases due to factors such as the reduction in the friction coefficient, the motor speed will inevitably be affected. Then, when the output power of the motor remains unchanged, the speed of the motor will decrease. This decrease in speed will directly affect the speed regulation time, because more time is required to adjust the motor speed to the same speed as the wheel-end reduction box.

[0035] Based on the above analysis, when the front drive motor is in an extremely low temperature condition, the low temperature will reduce the available torque of the motor, affect the speed regulation rate of the motor, cause the disconnect mechanism state switching to fail, and thus affect the power of the entire vehicle.

[0036] Based on this, in order to solve the problem of how to recover from the failure of the state switching of the disconnect mechanism due to low temperature, the present application provides a control strategy for the disconnect mechanism, which can take effective heating measures for different disconnect mechanism states, so that the auxiliary motor can restore the normal operating temperature as soon as possible, ensure that the disconnect mechanism can subsequently switch smoothly to the engaged state, ensure the normal operation of the four-wheel drive system, and improve the reliability of the vehicle power system in low temperature environments.

[0037] like Figure 1 As shown, an embodiment of the present application provides a control method for a disconnect mechanism, wherein the disconnect mechanism is arranged between an auxiliary motor and a front axle, and the method comprises:

[0038] Step 101: Detect the motor temperature corresponding to the auxiliary motor through a motor control unit.

[0039] The control method of the disconnect mechanism provided in the embodiment of the present application is applied to a control system, which includes a disconnect mechanism control unit, a motor control unit and a vehicle control unit.

[0040] Specifically, the motor temperature of the auxiliary motor is continuously monitored by the motor control unit. When it is detected that the motor temperature is lower than a first preset temperature threshold (eg, -25°C), it indicates that the motor is in a low temperature environment and its mechanical and electrical properties may be affected.

[0041] Step 102: When the disconnection mechanism switches from the disconnected state to the engaged state, the disconnection mechanism control unit detects whether the disconnection mechanism is successfully engaged.

[0042] Specifically, the vehicle control unit will determine whether the auxiliary motor is needed to provide power according to the vehicle driving information, road condition information, etc. Among them, when the auxiliary motor is needed to provide power, a connection instruction will be sent to the disconnection mechanism control unit, so that the disconnection mechanism control unit controls the disconnection mechanism to switch from the disconnected state to the connected state based on the connection instruction. Similarly, when the auxiliary motor is not needed to provide power, a disconnection instruction will be sent to the disconnection mechanism control unit, so that the disconnection mechanism control unit controls the disconnection mechanism to switch from the connected state to the disconnected state based on the disconnection instruction.

[0043] In the embodiment of the present application, when the disconnection mechanism fails to switch from the disconnected state to the engaged state, the disconnection mechanism control unit detects whether the disconnection mechanism is successfully engaged.

[0044] Step 103: when the motor temperature is lower than the first preset temperature threshold and the disconnection mechanism is not successfully engaged, obtaining the current state of the disconnection mechanism through the disconnection mechanism control unit;

[0045] Wherein, the current state includes a disconnected state and a partially connected state;

[0046] When the disconnect mechanism is in the disconnect state, the auxiliary motor is disconnected from the front axle; when the disconnect mechanism is in the engaged state, the auxiliary motor is engaged with the front axle; when the disconnect mechanism is in the partially engaged state, the auxiliary motor is partially engaged with the front axle;

[0047] Specifically, when the motor temperature is lower than the first preset temperature threshold and the disconnection mechanism is not successfully engaged, it indicates that the failure of the disconnection mechanism switching may be caused by insufficient motor output torque due to low temperature, poor lubrication causing mechanical parts to be blocked from moving, or other factors related to low temperature. At this time, the current state of the disconnection mechanism is obtained through the disconnection mechanism control unit, where the current state includes a disconnection state and a partially engaged state, so as to facilitate the subsequent selection of an appropriate heating strategy based on the current state.

[0048] For example, the current state of the disconnect mechanism can be determined by a position sensor or other detection device installed on the disconnect mechanism. If the sensor detects that the connecting parts of the disconnect mechanism are completely separated, it corresponds to the disconnect state; if it detects that the connecting parts are in contact to a certain extent but not completely connected, it corresponds to the partially connected state.

[0049] Step 104: determining a target heating strategy and a target control unit for executing the target heating strategy according to the current state, and heating the auxiliary motor according to the target heating strategy through the target control unit;

[0050] Wherein, the target control unit is one of the motor control unit and the vehicle control unit.

[0051] After obtaining the current state of the disconnect mechanism, the target heating strategy and the target control unit for executing the target heating strategy are determined according to the current state, and the target control unit is one of the motor control unit and the vehicle control unit. Among them, when it is determined that the disconnect mechanism is in the disconnect state, that is, the disconnect mechanism returns to the N gear, at this time, the auxiliary motor is not connected to the front axle, and the rotation of the drive motor will not affect the driving of the vehicle, so the strategy of self-heating of the auxiliary motor can be adopted. When the disconnect mechanism is in a partially engaged state, that is, the disconnect mechanism is in a position between the N gear and the 1st gear, the auxiliary motor is partially connected to the front axle, and the rotation of the drive motor will affect the driving of the vehicle. At this time, the residual heat of the battery and other motors (such as the rear axle motor) can be used through the vehicle's thermal management system to heat the auxiliary motor.

[0052] Step 105 : When the motor temperature is greater than a second preset temperature threshold, the target control unit is controlled to stop heating the auxiliary motor.

[0053] Wherein, the second preset temperature threshold is higher than the first preset temperature threshold.

[0054] Specifically, during the process of the target control unit executing the target heating strategy, the motor temperature is continuously detected by the motor control unit. When the motor temperature is greater than the second preset temperature threshold (e.g., 0°C), its mechanical and electrical properties are basically restored to normal, and the requirement of the disconnection mechanism switching to the engaged state can be met. Continuing heating not only wastes energy, but may also cause overheating damage to the motor. At this time, the target control unit is controlled to stop heating the auxiliary motor.

[0055] In the embodiment of the present application, when the motor temperature corresponding to the auxiliary motor is lower than the first preset temperature threshold and the disconnection mechanism fails to switch from the disconnected state to the engaged state, the current state of the disconnection mechanism is obtained, and according to the current state, the target heating strategy and the target control unit are determined, and the auxiliary motor is heated according to the target heating strategy by the target control unit, and at the same time, the motor temperature is detected during the heating process, and the auxiliary motor is stopped from being heated when the motor temperature is greater than the second preset temperature threshold. Effective heating measures can be taken for different disconnection mechanism states to restore the auxiliary motor to the normal operating temperature as soon as possible, ensure that the disconnection mechanism can be smoothly switched to the engaged state later, ensure the normal operation of the four-wheel drive system, and improve the reliability of the vehicle power system in low temperature environments.

[0056] In an optional embodiment of the present application, determining a target heating strategy and a target control unit for executing the target heating strategy according to the current state includes:

[0057] When the current state is the disconnected state, determining the first heating strategy as the target heating strategy, and determining the motor control unit as the target control unit;

[0058] When the current state is the partially combined state, the second heating strategy is determined as the target heating strategy, and the vehicle control unit is determined as the target control unit.

[0059] In the specific implementation process, when it is determined that the disconnect mechanism is in the disconnected state, the first heating strategy is determined as the target heating strategy, and the motor control unit is determined as the target control unit. The first heating strategy is to allow the auxiliary motor to generate heat itself to increase the temperature. Because in the disconnected state, there is no mechanical connection between the auxiliary motor and the front axle, starting the auxiliary motor to rotate at this time will not directly interfere with the driving of the vehicle.

[0060] When the disconnect mechanism is in a partially engaged state, there is a partial connection between the auxiliary motor and the front axle, and the second heating strategy is determined as the target heating strategy, and the vehicle control unit is determined as the target control unit. The second heating strategy is to use the heat generated by other vehicle components to heat the auxiliary motor. Because if the auxiliary motor is started to rotate on its own at this time, it may cause damage to the disconnect mechanism or the front axle due to the uncertainty of the connection.

[0061] The above implementation scheme of the present application adopts different heating strategies according to the different current states of the disconnect mechanism, which can achieve more accurate heating operation, effectively protect the auxiliary motor, disconnect mechanism, front axle and other vehicle components, reduce the wear, deformation, damage and other problems of components caused by improper heating or operation, thereby reducing the maintenance cost and failure rate of the vehicle, extending the service life of the vehicle, and improving the reliability and durability of the vehicle. In addition, this method of selecting appropriate heating strategies according to different states helps to optimize the energy management of the vehicle, improve the energy utilization efficiency of the vehicle, and for pure electric or hybrid vehicles, it can extend the vehicle's cruising range.

[0062] In an optional embodiment of the present application, when the target heating strategy is the first heating strategy, heating the auxiliary motor according to the target heating strategy by the target control unit includes:

[0063] sending a first heating request to the motor control unit through the disconnect mechanism control unit;

[0064] The motor control unit controls the auxiliary motor to operate at a preset torque based on the first heating request.

[0065] In the specific implementation process, when it is determined that the target heating strategy is the first heating strategy, the first heating request is sent to the motor control unit through the disconnection mechanism control unit. The first heating request contains key parameter information about the operation of the auxiliary motor, such as the specific value of the preset torque, the operation direction, the operation time and other related settings. As a component that directly controls the operation of the auxiliary motor, the motor control unit controls the operation state of the auxiliary motor according to the first heating request after receiving the first heating request.

[0066] The preset torque here is a suitable torque value verified by experiments, for example, set to 15Nm.

[0067] By sending the first heating request to the motor control unit, a small torque (such as 15Nm) can be applied to the auxiliary motor to make it rotate slowly. During the rotation process, the winding inside the motor will generate heat through the current, which will gradually be transferred to other parts of the motor and the surrounding lubricating grease, thereby increasing their temperature. At the same time, since the disconnection mechanism is in the disconnected state, this self-heating method will not directly interfere with the front axle and the driving of the vehicle.

[0068] The above implementation scheme of the present application realizes precise control of the auxiliary motor heating process by sending a first heating request containing a preset torque to the motor control unit. The motor control unit can accurately drive the motor to operate according to the set torque value, ensuring that the rate at which the motor generates heat is relatively stable, avoiding problems such as insufficient heating or overheating caused by unstable or inappropriate torque, and effectively improving the heating efficiency. It improves the timeliness of the vehicle's four-wheel drive system returning to normal operation.

[0069] In an optional embodiment of the present application, when the target heating strategy is the second heating strategy, heating the auxiliary motor according to the target heating strategy by the target control unit includes:

[0070] Sending a second heating request to the vehicle control unit through the disconnect mechanism control unit;

[0071] The vehicle control unit adjusts the pipeline flow corresponding to the auxiliary motor in the thermal management system based on the second heating request.

[0072] In the specific implementation process, when the target heating strategy is determined to be the second heating strategy, the second heating request is sent to the vehicle control unit through the disconnection mechanism control unit. The second heating request contains key information for the auxiliary motor heating requirements, such as the flow rate that needs to be adjusted and other parameter settings. After receiving the second heating request, the vehicle control unit will adjust the pipeline flow corresponding to the auxiliary motor in the thermal management system based on the second heating request.

[0073] It should be noted that the vehicle's thermal management system is responsible for the overall management of heat distribution and regulation of various parts of the vehicle, including temperature control of key components such as batteries and motors. In the thermal management system, the coolant circulates through pipes between various components that require temperature regulation to transfer heat. A coolant circulation pipeline is arranged on the auxiliary motor. When the vehicle control unit receives the second heating request, it will change the coolant flow through the corresponding pipeline of the auxiliary motor by controlling the relevant valve opening and the duty cycle of the water pump.

[0074] Specifically, after receiving the second heating request, the vehicle control unit will increase the duty cycle of the water pump and adjust the opening of the corresponding valve, such as increasing the duty cycle of the water pump from the original 40% to 60%, so that more heat-carrying coolant can flow through the auxiliary motor, allowing the auxiliary motor to absorb more heat from the coolant to increase its own temperature.

[0075] The above implementation scheme of the present application realizes heating by adjusting the pipeline flow corresponding to the auxiliary motor in the thermal management system by the vehicle control unit, making full use of the waste heat generated by other components of the vehicle (such as batteries, rear axle motors, etc.) during operation, avoiding energy waste, improving the overall energy utilization efficiency of the vehicle, and extending the cruising range.

[0076] In an optional embodiment of the present application, the method further includes:

[0077] When the motor temperature corresponding to the auxiliary motor is lower than the first preset temperature threshold, the disconnection mechanism control unit adjusts the combined diagnosis duration corresponding to the disconnection mechanism from the first duration to the second duration, wherein the second duration is greater than the first duration;

[0078] Wherein, when the disconnect mechanism control unit receives the engagement instruction and fails to detect that the disconnect mechanism completes engagement within the engagement diagnosis time, it is determined that the disconnect mechanism fails to engage successfully.

[0079] In the specific implementation process, when it is detected that the motor temperature is lower than the first preset temperature threshold, the low temperature may reduce the torque output of the motor, slow down the movement speed of mechanical parts, and deteriorate the lubrication performance, etc., resulting in a delay in the engagement action of the disconnect mechanism. In order to more accurately judge the engagement state of the disconnect mechanism, the system will automatically adjust the engagement diagnosis time corresponding to the disconnect mechanism from the first time to the second time. The first time and the second time here are parameters pre-set in the vehicle control system. The first time is usually applicable to the diagnosis and judgment of the engagement action of the disconnect mechanism under normal temperature conditions, while the second time is a longer diagnostic time specifically set for low temperature environments. For example, the first time is set to 4.5 seconds and the second time is set to 6 seconds.

[0080] When the disconnect mechanism control unit receives the engagement instruction, it starts timing and monitors the engagement process of the disconnect mechanism. Under normal temperature, the diagnosis is performed according to the first duration. If the disconnect mechanism fails to complete the switch from the disconnected state to the engaged state within this time, it is determined to be a failed engagement. Under low temperature conditions, the diagnosis is performed according to the second duration. At low temperatures, the motor needs a longer time to reach the appropriate speed and torque to drive the disconnect mechanism to complete the engagement, or because the viscosity of the lubricant increases, the friction resistance between the mechanical parts increases, slowing down the engagement process. Only when the engagement is still not completed after the second duration, it is determined that the disconnect mechanism has failed to switch from the disconnected state to the engaged state, and then the subsequent heating treatment operation is triggered.

[0081] For example, when the vehicle is driving in a cold area, it needs to switch from two-wheel drive mode to four-wheel drive mode due to changes in road conditions. At this time, the temperature of the auxiliary motor is lower than -25°C due to the low temperature environment. The disconnect mechanism starts to act after receiving the connection command and performs diagnosis according to the adjusted second time length (6 seconds). If the connection is successful within 6 seconds, the vehicle's four-wheel drive power system works normally; if it fails for more than 6 seconds, the vehicle is judged as a connection failure, and then it may use residual heat or let the auxiliary motor heat itself to restore its performance according to the set strategy, so as to try to connect again.

[0082] The above implementation scheme of the present application prolongs the bonding diagnosis time in a low temperature environment, which can fully consider the impact of low temperature on the bonding process of the motor and the disconnection mechanism, and avoid misjudging bonding failure due to too short diagnosis time.

[0083] In an optional embodiment of the present application, the method further includes:

[0084] When the motor temperature corresponding to the auxiliary motor is lower than the first preset temperature threshold, the motor control unit adjusts the combined torque diagnosis duration corresponding to the auxiliary motor from the third duration to the fourth duration, wherein the fourth duration is greater than the third duration.

[0085] In the specific implementation process, when it is detected that the motor temperature is lower than the first preset temperature threshold, the auxiliary motor combined torque diagnosis time is adjusted by the motor control unit. Under normal operating temperature conditions, the combined torque diagnosis time is set to the third time. When in a low temperature environment, the performance of the motor will change significantly, such as changes in the mechanical friction coefficient and changes in the winding resistance affecting the current and torque output, so it is necessary to extend the combined torque diagnosis time to the fourth time. Extending the diagnosis time can give the motor more time to overcome the adverse effects of these low temperatures, and can more comprehensively and accurately evaluate the match between the motor's torque output capacity under low temperature conditions and the disconnection mechanism's combination requirements.

[0086] In the above implementation scheme of the present application, the low temperature environment has a greater impact on the motor torque output characteristics. By extending the torque diagnosis time, it can effectively avoid the temporary fluctuation of the motor torque caused by low temperature and misjudging it as a fault. At the same time, it will not miss the real fault, thereby improving the accuracy of torque diagnosis, improving the vehicle's power performance and handling stability during low-temperature driving, and enhancing driving safety.

[0087] In an optional embodiment of the present application, before the auxiliary motor is heated by the target control unit according to the target heating strategy, the method further includes:

[0088] When the disconnect mechanism control unit receives the engagement instruction, the actual speed regulating torque and the target speed regulating torque corresponding to the auxiliary motor are obtained through the motor control unit;

[0089] Determining a torque difference according to the actual speed regulating torque and the target speed regulating torque by the motor control unit;

[0090] When the duration of the torque difference being greater than or equal to the preset torque difference is greater than or equal to the combined torque diagnosis duration, determining that the auxiliary motor has a fault;

[0091] When the torque difference is less than the preset torque difference, or the duration of the torque difference being greater than or equal to the preset torque difference is less than the combined torque diagnosis duration, determining that the auxiliary motor has no fault;

[0092] The auxiliary motor is heated by the target control unit according to the target heating strategy, including:

[0093] When there is no fault in the auxiliary motor, the auxiliary motor is heated by the target control unit according to the target heating strategy.

[0094] In the specific implementation process, when the disconnect mechanism control unit receives the engagement instruction, the actual speed regulating torque and target speed regulating torque corresponding to the auxiliary motor are obtained through the motor control unit. The target speed regulating torque is a theoretical torque value pre-set according to the current driving conditions, power requirements and ideal conditions for the disconnect mechanism to engage. It represents the torque that the auxiliary motor should output in order to smoothly switch the disconnect mechanism from the disconnected state to the engaged state. The actual speed regulating torque is the torque value of the actual output of the motor measured in real time.

[0095] The motor control unit calculates the torque difference between the actual speed regulating torque and the target speed regulating torque obtained, that is, torque difference = |actual speed regulating torque - target speed regulating torque|. This torque difference is then compared with the preset torque difference, and the duration of the torque difference being greater than the preset torque difference is monitored. The preset torque difference is a threshold value determined through tests and vehicle performance analysis, for example, set to 40Nm.

[0096] If the torque difference is greater than or equal to the preset torque difference and lasts for a duration greater than or equal to the combined torque diagnosis duration, it indicates that the motor may have a mechanical fault (such as abnormal friction resistance caused by bearing wear, short circuit in the motor's internal winding affecting torque output, etc.) or an electrical fault (such as controller failure leading to inaccurate torque control, etc.). In this case, the auxiliary motor is determined to be faulty and the corresponding fault alarm mechanism is triggered to inform the driver that there is a problem with the vehicle's power system. At the same time, some emergency measures may be taken, such as limiting the vehicle's power output and maintaining basic driving only in two-wheel drive mode to avoid more serious damage or safety accidents caused by the continued operation of the faulty motor.

[0097] On the contrary, if the torque difference is less than the preset torque difference, or although the torque difference is greater than or equal to the preset torque difference but the duration is less than the combined torque diagnosis time, it is determined that there is no fault in the auxiliary motor. At this time, the auxiliary motor can be heated according to the target heating strategy to solve the problem of insufficient torque or difficulty in engagement caused by environmental factors such as low temperature.

[0098] The above implementation scheme of the present application can accurately determine whether the auxiliary motor has a fault by comparing the actual speed regulation torque and the target speed regulation torque and monitoring the duration of the torque difference. After determining that the auxiliary motor does not have a fault, heating is performed according to the target heating strategy to ensure the effectiveness and pertinence of the heating strategy. If the motor is directly heated without being detected when there is a fault, it will not only fail to solve the fundamental problem, but may also waste energy and delay the fault repair time. The heating strategy is only started when the motor is not faulty but needs to be heated due to environmental factors. This can make the heating process more effective in improving the motor performance and help the disconnection mechanism to combine smoothly, thereby ensuring the normal switching and operation of the vehicle's four-wheel drive power system, improving the vehicle's power performance and handling in low temperature environments, and providing the driver with a more stable and reliable driving experience.

[0099] In an optional embodiment of the present application, heating the auxiliary motor according to the target heating strategy by the target control unit includes:

[0100] Obtaining the remaining power of the power battery through the target control unit;

[0101] When the remaining power is greater than a preset power, heating the auxiliary motor according to the target heating strategy through the target control unit;

[0102] When the remaining power is less than the preset power, the target control unit is controlled to stop heating the auxiliary motor.

[0103] Specifically, the target control unit will monitor the remaining power of the power battery in real time. Before heating the auxiliary motor according to the target heating strategy, the current remaining power of the power battery is obtained and compared with the preset power. The preset power is a threshold determined by comprehensively considering vehicle performance, endurance requirements, and heating strategy energy consumption. For example, the preset power may be set to 30% of the total power.

[0104] When the remaining power is greater than the preset power, it indicates that the vehicle's current power reserve is relatively sufficient and has enough energy to support the heating operation of the auxiliary motor. At this time, the target control unit heats the auxiliary motor according to the target heating strategy to achieve heating of the auxiliary motor to solve the problem of the auxiliary motor and the disconnection mechanism being combined due to low temperature or other reasons.

[0105] When the remaining power is less than the preset power, it indicates that the vehicle's power is relatively tight. Continuing the heating operation at this time may seriously affect the vehicle's range, or even cause the vehicle to be unable to drive normally due to depletion of power. The control target control unit stops heating the auxiliary motor.

[0106] The above implementation scheme of the present application obtains the remaining power of the power battery, decides whether to heat the auxiliary motor according to the power situation, and stops heating when the power is insufficient. This can effectively avoid excessive consumption of electricity due to heating the auxiliary motor, thereby ensuring the vehicle's cruising range.

[0107] The overall implementation process of the embodiment of the present application is introduced below. Figure 2 As shown, the specific steps include:

[0108] When the motor control unit (MCU) detects that the motor temperature is less than -25°C, it adjusts the auxiliary motor's torque diagnosis time to 300ms and the disconnect mechanism's diagnosis time to 6s. When the disconnect mechanism control unit (Actuator Control Unit for Electrical Axle Actuator, ACU) receives the engagement command, it controls the disconnect mechanism to engage. When the disconnect mechanism fails to switch from the disconnected state to the engaged state, it obtains the current position of the disconnect mechanism and records the fault code. At the same time, the MCU determines whether the auxiliary motor has a fault and sends the motor diagnosis result to the ACU. The ACU sends a heating request when it determines that the motor has no fault.

[0109] Among them, when the ACU is in the N gear in the disconnect structure, it sends a heating request to the MCU, and the battery management system (BMS) sends the remaining power to the MCU. When the remaining power is greater than 40% and the motor is not faulty, the MCU applies 15Nm torque to rotate by itself to heat the motor, and stops heating when the motor temperature reaches 0°C or the remaining power is less than 30%. The ACU clears the fault code when the motor temperature reaches 0°C. When the ACU is in the middle position of the disconnect structure, it sends a heating request to the vehicle control unit (VCU). At the same time, the BMS sends the remaining power to the VCU. When the remaining power is greater than 40% and the motor is not faulty, the VCU controls the duty cycle of the water pump in the thermal management system to heat the motor, and stops heating when the motor temperature reaches 0°C or the remaining power is less than 30%. Similarly, the ACU clears the fault code when the motor temperature reaches 0°C.

[0110] like Figure 3 As shown, an embodiment of the present invention further provides a control device for a disconnect mechanism, which is applied to a control system, wherein the control system includes a disconnect mechanism control unit, a motor control unit, and a vehicle control unit; the disconnect mechanism is arranged between the auxiliary motor and the front axle, and the device includes:

[0111] A first detection module 301, configured to detect a motor temperature corresponding to the auxiliary motor through the motor control unit;

[0112] A second detection module 302, configured to detect whether the disconnection mechanism is successfully engaged through the disconnection mechanism control unit when the disconnection mechanism is switched from a disconnected state to an engaged state;

[0113] A first acquisition module 303, configured to acquire a current state of the disconnection mechanism through the disconnection mechanism control unit when the temperature of the motor is lower than a first preset temperature threshold and the disconnection mechanism is not successfully engaged, wherein the current state includes a disconnection state and a partially engaged state;

[0114] A first processing module 304 is used to determine a target heating strategy and a target control unit for executing the target heating strategy according to the current state, and heat the auxiliary motor according to the target heating strategy through the target control unit; wherein the target control unit is one of the motor control unit and the vehicle control unit;

[0115] A second processing module 305 is used to control the target control unit to stop heating the auxiliary motor when the motor temperature is greater than a second preset temperature threshold;

[0116] Among them, when the disconnection mechanism is in the disconnection state, the auxiliary motor and the front axle are disengaged; when the disconnection mechanism is in the engagement state, the auxiliary motor and the front axle are engaged; when the disconnection mechanism is in the partial engagement state, the auxiliary motor and the front axle are partially engaged; the second preset temperature threshold is higher than the first preset temperature threshold.

[0117] Optionally, the first processing module includes:

[0118] A first determination submodule, configured to determine, when the current state is the disconnected state, a first heating strategy as a target heating strategy, and determine the motor control unit as the target control unit;

[0119] The second determination submodule is used to determine the second heating strategy as the target heating strategy and determine the vehicle control unit as the target control unit when the current state is the partially combined state.

[0120] Optionally, when the target heating strategy is the first heating strategy, the first processing module further includes:

[0121] A first sending submodule, configured to send a first heating request to the motor control unit through the disconnect mechanism control unit;

[0122] The first control submodule is configured to control the auxiliary motor to operate at a preset torque based on the first heating request by the motor control unit.

[0123] Optionally, when the target heating strategy is the second heating strategy, the first processing module further includes:

[0124] A second sending submodule, used for sending a second heating request to the vehicle control unit through the disconnection mechanism control unit;

[0125] The second control submodule is used for the vehicle control unit to adjust the pipeline flow corresponding to the auxiliary motor in the thermal management system based on the second heating request.

[0126] Optionally, the device further comprises:

[0127] a first adjustment module, configured to adjust the combined diagnosis duration corresponding to the disconnection mechanism from a first duration to a second duration through the disconnection mechanism control unit when the motor temperature corresponding to the auxiliary motor is lower than the first preset temperature threshold, wherein the second duration is greater than the first duration;

[0128] Wherein, when the disconnect mechanism control unit receives the engagement instruction and fails to detect that the disconnect mechanism completes engagement within the engagement diagnosis time, it is determined that the disconnect mechanism fails to engage successfully.

[0129] Optionally, the device further comprises:

[0130] The second adjustment module is used to adjust the combined torque diagnosis time corresponding to the auxiliary motor from the third time to the fourth time through the motor control unit when the motor temperature corresponding to the auxiliary motor is lower than the first preset temperature threshold, wherein the fourth time is greater than the third time.

[0131] Optionally, before the auxiliary motor is heated by the target control unit according to the target heating strategy, the device further includes:

[0132] A second acquisition module, configured to acquire, through the motor control unit, an actual speed regulating torque and a target speed regulating torque corresponding to the auxiliary motor when the disconnect mechanism control unit receives a connection instruction;

[0133] A first determining module, configured to determine a torque difference according to the actual speed regulating torque and the target speed regulating torque through the motor control unit;

[0134] A second determination module is used to determine that the auxiliary motor has a fault when the duration of the torque difference being greater than or equal to the preset torque difference is greater than or equal to the combined torque diagnosis duration;

[0135] A third determination module, configured to determine that the auxiliary motor does not have a fault when the torque difference is less than the preset torque difference or the duration for which the torque difference is greater than or equal to the preset torque difference is less than the combined torque diagnosis duration;

[0136] The first processing module is further configured to:

[0137] When there is no fault in the auxiliary motor, the auxiliary motor is heated by the target control unit according to the target heating strategy.

[0138] Optionally, the first processing module further includes:

[0139] An acquisition submodule, used for acquiring the remaining power of the power battery through the target control unit;

[0140] A first processing submodule, configured to heat the auxiliary motor according to the target heating strategy through the target control unit when the remaining power is greater than a preset power;

[0141] The second processing submodule is used to control the target control unit to stop heating the auxiliary motor when the remaining power is less than the preset power.

[0142] The control device of the disconnect mechanism provided in the present application obtains the current state of the disconnect mechanism when the motor temperature corresponding to the auxiliary motor is lower than the first preset temperature threshold and the disconnect mechanism fails to switch from the disconnect state to the engaged state, and determines the target heating strategy and the target control unit according to the current state, and heats the auxiliary motor according to the target heating strategy through the target control unit, and at the same time, detects the motor temperature during the heating process, and stops heating the auxiliary motor when the motor temperature is greater than the second preset temperature threshold. Effective heating measures can be taken for different disconnect mechanism states to restore the auxiliary motor to normal operating temperature as soon as possible, ensure that the disconnect mechanism can be smoothly switched to the engaged state later, ensure the normal operation of the four-wheel drive system, and improve the reliability of the vehicle power system in low temperature environments.

[0143] As for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0144] An embodiment of the present application also provides an electronic device, including: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, the various processes of the control method embodiment of the above-mentioned disconnection mechanism are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be described here.

[0145] For example, Figure 4 FIG. 1 shows a schematic diagram of the physical structure of an electronic device. Figure 4As shown, the electronic device may include: a processor (processor) 410, a communication interface (Communications Interface) 420, a memory (memory) 430 and a communication bus 440, wherein the processor 410, the communication interface 420, and the memory 430 communicate with each other through the communication bus 440. The processor 410 can call the logic instructions in the memory 430, and the processor 410 is used to perform the following steps: detecting the motor temperature corresponding to the auxiliary motor through the motor control unit; when the disconnection mechanism switches from the disconnection state to the combination state, detecting whether the disconnection mechanism is successfully combined through the disconnection mechanism control unit; when the motor temperature is lower than the first preset temperature threshold and the disconnection mechanism is not successfully combined, obtaining the current state of the disconnection mechanism through the disconnection mechanism control unit, wherein the current state includes a disconnection state and a partial combination state; according to the current state, determining a target heating strategy and a target control unit for executing the target heating strategy, and heating the auxiliary motor according to the target heating strategy through the target control unit; wherein the target control unit is one of the motor control unit and the vehicle control unit; when the motor temperature is greater than a second preset temperature threshold, controlling the target control unit to stop heating the auxiliary motor; wherein, when the disconnection mechanism is in the disconnection state, the auxiliary motor is disengaged from the front axle; when the disconnection mechanism is in the combination state, the auxiliary motor is combined with the front axle; when the disconnection mechanism is in the partial combination state, the auxiliary motor is partially combined with the front axle; the second preset temperature threshold is higher than the first preset temperature threshold. The processor 410 may also execute other solutions in the embodiments of the present application, which will not be further elaborated here.

[0146] In addition, the logic instructions in the above-mentioned memory 430 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application.

[0147] The embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, each process of the control method embodiment of the disconnection mechanism described above is implemented, and the same technical effect can be achieved. To avoid repetition, it is not repeated here. The computer-readable storage medium is, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0148] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0149] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0150] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

[0151] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in the present application can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0152] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0153] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0154] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0155] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0156] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard drives, ROM, RAM, magnetic disks, or optical disks.

[0157] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A method for controlling a disconnect mechanism, characterized in that: Applied to a control system, the control system comprising a disconnect mechanism control unit, a motor control unit and a vehicle control unit; The disconnect mechanism is arranged between the auxiliary motor and the front axle, and the method comprises: Detecting the motor temperature corresponding to the auxiliary motor by the motor control unit; When the disconnection mechanism switches from the disconnection state to the engagement state, the disconnection mechanism control unit detects whether the disconnection mechanism is successfully engaged; When the temperature of the motor is lower than a first preset temperature threshold and the disconnection mechanism is not successfully engaged, obtaining a current state of the disconnection mechanism through the disconnection mechanism control unit, wherein the current state includes a disconnection state and a partially engaged state; According to the current state, a target heating strategy and a target control unit for executing the target heating strategy are determined, and the auxiliary motor is heated according to the target heating strategy by the target control unit; wherein the target control unit is one of the motor control unit and the vehicle control unit; When the motor temperature is greater than a second preset temperature threshold, controlling the target control unit to stop heating the auxiliary motor; Among them, when the disconnection mechanism is in the disconnection state, the auxiliary motor and the front axle are disengaged; when the disconnection mechanism is in the engagement state, the auxiliary motor and the front axle are engaged; when the disconnection mechanism is in the partial engagement state, the auxiliary motor and the front axle are partially engaged; the second preset temperature threshold is higher than the first preset temperature threshold.

2. The control method of the disconnection mechanism according to claim 1, characterized in that: Determining a target heating strategy and a target control unit for executing the target heating strategy according to the current state includes: When the current state is the disconnected state, determining the first heating strategy as the target heating strategy, and determining the motor control unit as the target control unit; When the current state is the partially combined state, the second heating strategy is determined as the target heating strategy, and the vehicle control unit is determined as the target control unit.

3. The control method of the disconnection mechanism according to claim 2, characterized in that: When the target heating strategy is the first heating strategy, heating the auxiliary motor according to the target heating strategy by the target control unit includes: sending a first heating request to the motor control unit through the disconnect mechanism control unit; The motor control unit controls the auxiliary motor to operate at a preset torque based on the first heating request.

4. The control method of the disconnection mechanism according to claim 2, characterized in that: When the target heating strategy is the second heating strategy, heating the auxiliary motor according to the target heating strategy by the target control unit includes: Sending a second heating request to the vehicle control unit through the disconnect mechanism control unit; The vehicle control unit adjusts the pipeline flow corresponding to the auxiliary motor in the thermal management system based on the second heating request.

5. The control method of the disconnect mechanism according to claim 1, characterized in that: The method further comprises: When the motor temperature corresponding to the auxiliary motor is lower than the first preset temperature threshold, the disconnection mechanism control unit adjusts the combined diagnosis duration corresponding to the disconnection mechanism from the first duration to the second duration, wherein the second duration is greater than the first duration; Wherein, when the disconnect mechanism control unit receives the engagement instruction and fails to detect that the disconnect mechanism completes engagement within the engagement diagnosis time, it is determined that the disconnect mechanism fails to engage successfully.

6. The control method of the disconnect mechanism according to claim 1, characterized in that: The method further comprises: When the motor temperature corresponding to the auxiliary motor is lower than the first preset temperature threshold, the motor control unit adjusts the combined torque diagnosis duration corresponding to the auxiliary motor from the third duration to the fourth duration, wherein the fourth duration is greater than the third duration.

7. The control method of the disconnection mechanism according to claim 1, characterized in that: Before heating the auxiliary motor according to the target heating strategy by the target control unit, the method further includes: When the disconnect mechanism control unit receives the engagement instruction, the actual speed regulating torque and the target speed regulating torque corresponding to the auxiliary motor are obtained through the motor control unit; Determining a torque difference according to the actual speed regulating torque and the target speed regulating torque by the motor control unit; When the duration of the torque difference being greater than or equal to the preset torque difference is greater than or equal to the combined torque diagnosis duration, determining that the auxiliary motor has a fault; When the torque difference is less than the preset torque difference, or the duration of the torque difference being greater than or equal to the preset torque difference is less than the combined torque diagnosis duration, determining that the auxiliary motor has no fault; The auxiliary motor is heated by the target control unit according to the target heating strategy, including: When there is no fault in the auxiliary motor, the auxiliary motor is heated by the target control unit according to the target heating strategy.

8. The control method of the disconnect mechanism according to claim 1, characterized in that: The auxiliary motor is heated by the target control unit according to the target heating strategy, including: Obtaining the remaining power of the power battery through the target control unit; When the remaining power is greater than a preset power, heating the auxiliary motor according to the target heating strategy through the target control unit; When the remaining power is less than the preset power, the target control unit is controlled to stop heating the auxiliary motor.

9. A control device for a disconnect mechanism, characterized in that: Applied to a control system, the control system comprising a disconnect mechanism control unit, a motor control unit and a vehicle control unit; The disconnect mechanism is arranged between the auxiliary motor and the front axle, and the device comprises: A first detection module, used for detecting a motor temperature corresponding to the auxiliary motor through the motor control unit; A second detection module, used for detecting whether the disconnection mechanism is successfully engaged through the disconnection mechanism control unit when the disconnection mechanism is switched from the disconnection state to the engagement state; A first acquisition module, configured to acquire a current state of the disconnection mechanism through the disconnection mechanism control unit when the temperature of the motor is lower than a first preset temperature threshold and the disconnection mechanism is not successfully engaged, wherein the current state includes a disconnection state and a partially engaged state; A first processing module, configured to determine a target heating strategy and a target control unit for executing the target heating strategy according to the current state, and heat the auxiliary motor according to the target heating strategy through the target control unit; wherein the target control unit is one of the motor control unit and the vehicle control unit; A second processing module, configured to control the target control unit to stop heating the auxiliary motor when the motor temperature is greater than a second preset temperature threshold; Among them, when the disconnection mechanism is in the disconnection state, the auxiliary motor and the front axle are disengaged; when the disconnection mechanism is in the engagement state, the auxiliary motor and the front axle are engaged; when the disconnection mechanism is in the partial engagement state, the auxiliary motor and the front axle are partially engaged; the second preset temperature threshold is higher than the first preset temperature threshold.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the control method of the disconnect mechanism according to any one of claims 1 to 8 is implemented.

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