Differential lock control method and device, vehicle and storage medium

Abstract

The invention provides a differential lock control method and device, a vehicle and a storage medium, the method is applied to the technical field of vehicles, and the method comprises the steps that when a locking request of a differential lock is detected, the current driving mode of a motor of an electric vehicle is detected; determining a target bridge currently driven by the motor according to the current driving mode; if the differential lock of the target bridge meets the preset locking condition, the differential lock is controlled to be locked. According to the method, when the locking request of the differential lock is detected, the conditions such as the vehicle speed, the wheel speed, the driving mode and the driving mode of the vehicle are comprehensively considered, and when the preset locking conditions are met, the differential lock is automatically controlled to be locked, so that the use requirements of the vehicle under different conditions are met, and the driving safety is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of vehicles, and more specifically, to a control method, device, vehicle and storage medium for a differential lock in the field of vehicle differential locks. Background Art

[0002] As a very important automobile component, the differential mainly regulates the rotation speed of the left and right wheels during driving, reduces the friction between the tires and the ground, and enables the wheels to turn smoothly. However, when the vehicle is stuck in sand, snow, mud, or one wheel is off the ground, due to the differential effect of the differential, the torque of the wheel on the high adhesion side will be used to accelerate the wheel on the low adhesion side, resulting in power consumption and the vehicle cannot get power to get out of trouble.

[0003] In the related art, whether the differential needs to be locked is determined only based on the signal status of the vehicle speed, wheel speed, etc., and by locking the differential, the differential gear is locked so that the left and right wheels are rigidly connected as a whole, and the torque and grip are transmitted to the non-slip wheels to help the vehicle get out of trouble. However, due to the different types of vehicles and corresponding drive modes, the locking can easily fail, causing damage to the differential gear and other conditions, affecting driving safety. Summary of the invention

[0004] The present application provides a control method, device, vehicle and storage medium for a differential lock. The method can, when detecting a locking request for a differential lock, comprehensively consider conditions such as the vehicle speed, wheel speed, driving mode and drive mode, and automatically control the locking of the differential lock when the preset locking conditions are met, so as to meet the usage requirements of the vehicle in different situations and ensure driving safety.

[0005] In a first aspect, a method for controlling a differential lock is provided, the method comprising: when a locking request for the differential lock is detected, detecting a current driving mode of a motor of an electric vehicle; determining a target axle currently driven by the motor according to the current driving mode; and if the differential lock of the target axle meets a preset locking condition, controlling the differential lock to lock.

[0006] Through the above technical scheme, the embodiment of the present application can detect the current driving mode of the motor of the electric vehicle when a locking request for the differential lock is detected, determine the target electric axle currently driven by the motor based on the current driving mode, and judge whether the differential lock of the target electric axle meets the preset locking conditions, that is, judge from conditions such as vehicle speed, wheel speed, driving mode and drive mode, and control the differential lock to lock when the preset locking conditions are met. Therefore, the present application automatically controls the locking or unlocking of the differential lock through different signal states such as vehicle speed, wheel speed, driving mode and drive mode to meet the use requirements of the vehicle in different situations and ensure driving safety.

[0007] In combination with the first aspect, in some possible implementations, the preset locking conditions include: the current vehicle speed of the electric vehicle is less than a first preset vehicle speed; the wheel speed difference corresponding to the target electric axle is less than a preset value; the current driving mode of the electric vehicle is a preset driving mode; and the current driving mode is a preset driving mode.

[0008] Through the above technical solution, the embodiment of the present application can control the differential lock to lock when it is detected that the current vehicle speed of the electric vehicle is less than the first preset vehicle speed, the wheel speed difference corresponding to the target electric axle is less than the preset value, the current driving mode of the electric vehicle is the preset driving mode and the current drive mode is the preset drive mode, and when all the above conditions are met, to ensure driving safety.

[0009] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, after controlling the differential lock to lock, it also includes: detecting the current vehicle speed of the electric vehicle; if the current vehicle speed is greater than a second preset vehicle speed and less than a third preset vehicle speed, generating an overspeed alarm prompt, wherein the second preset vehicle speed is greater than the first preset vehicle speed, and the third preset vehicle speed is greater than the second preset vehicle speed; if the current vehicle speed is greater than or equal to the third preset vehicle speed, controlling the differential lock to unlock.

[0010] Through the above technical scheme, the embodiment of the present application can control the vehicle to perform corresponding operations according to the current speed range of the electric vehicle, realize functions such as automatic unlocking, overspeed alarm, and rejection of locking due to incorrect operation, and fully ensure driving safety.

[0011] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, after controlling the differential lock to be locked, it also includes: detecting a current driving mode of the electric vehicle; if the current driving mode is not a preset driving mode, controlling the differential lock to be unlocked.

[0012] Through the above technical solution, the embodiment of the present application can detect the current driving mode of the electric vehicle, and if the current driving mode is not a preset driving mode, the differential lock is controlled to be unlocked.

[0013] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, after controlling the differential lock to lock, it also includes: detecting whether the differential lock is faulty; if the differential lock is faulty, controlling the differential lock to unlock, and generating a fault alarm prompt for the differential lock.

[0014] Through the above technical solution, the embodiment of the present application can control the differential lock to unlock and generate a fault alarm prompt when a differential lock fault is detected, thereby avoiding the driving safety of the vehicle being affected by the differential lock fault.

[0015] In combination with the first aspect and the above implementations, in some possible implementations, after controlling the differential lock to be locked, the method further includes: detecting a manual unlocking signal of the differential lock; and controlling the differential lock to be unlocked according to the manual unlocking signal.

[0016] Through the above technical solution, the embodiment of the present application can control the differential lock to unlock when a manual unlocking signal of the differential lock is detected, so as to meet the demand for manual unlocking of the differential lock and ensure driving safety.

[0017] In combination with the first aspect and the above-mentioned implementations, in some possible implementations, detecting the current driving mode of the motor of the electric vehicle includes: acquiring a driving mode signal of the motor; and determining the current driving mode of the motor according to the driving mode signal.

[0018] Through the above technical solution, the embodiment of the present application can obtain the driving mode signal of the motor and determine the current driving mode of the motor according to the driving mode signal, so as to subsequently control the locking or unlocking of the differential lock according to the current driving mode of the motor in combination with other signals.

[0019] In a second aspect, a vehicle control device is provided, which includes: a differential lock control device, characterized in that the device includes: a detection module, used to detect the current driving mode of the motor of the electric vehicle when a locking request of the differential lock is detected; a processing module, used to determine the target electric axle currently driven by the motor according to the current driving mode; and a control module, used to control the differential lock to lock if the differential lock of the target electric axle meets a preset locking condition.

[0020] In a third aspect, a vehicle is provided, characterized in that the vehicle comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the program to implement the differential lock control method as described in the above embodiment.

[0021] In a fourth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed, the control method of the differential lock as described in the above embodiment is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a flow chart of a differential lock control method provided in an embodiment of the present application;

[0023] Figure 2 is a block diagram of a differential lock control device provided in an embodiment of the present application;

[0024] Figure 3 It is a schematic diagram of the structure of a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] The technical solution in the present application will be described clearly and in detail below in conjunction with the accompanying drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0026] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0027] Traditional internal combustion engine steam turbine motor vehicles are equipped with front and rear wheel locks, which only include the traditional drive axle internal differential lock control strategy, and there is no new energy motor vehicle electric drive internal differential lock control strategy.

[0028] At present, the electronic differential lock controller only makes judgments based on the signal status of vehicle speed, wheel speed, etc., but the configuration of new energy vehicles needs to consider motor and other signals. If the motor signal is not processed, it is easy to cause locking failure.

[0029] The prior art may cause the following technical problems:

[0030] (1) Failure to process the drive motor signal of new energy vehicles may easily cause locking failure;

[0031] (2) Installing the differential lock on the electric drive axle requires different signal input and control strategies. The existing signal definition and control strategy cannot meet the usage requirements and are prone to locking failure.

[0032] The differential lock of the embodiment of the present application is assembled to the electric drive axle, wherein the electric drive axle may include an electric drive front axle and an electric drive rear axle.

[0033] Figure 1 It is a schematic flow chart of a differential lock control method provided in an embodiment of the present application.

[0034] For example, Figure 1 As shown, the control method of the differential lock includes the following steps:

[0035] In step S101 , when a locking request of a differential lock is detected, a current driving mode of a motor of the electric vehicle is detected.

[0036] It can be understood that the embodiment of the present application can receive various signal requests or data from different components of the vehicle through the CAN (Controller Area Network) bus and forward them to the corresponding processor. When a locking request of the differential is detected, the current driving mode of the motor of the electric vehicle is detected, so as to subsequently determine the target axle currently driven by the motor according to the current driving mode.

[0037] It should be noted that the driving modes in the embodiments of the present application may include: pure electric four-wheel drive mode, pure electric front-wheel drive mode, pure electric rear-wheel drive mode, direct-drive four-wheel drive mode, direct-drive front-wheel drive mode or direct-drive rear-wheel drive mode. Specifically, the direct-drive mode refers to the engine directly driving the wheels. This mode is mainly used for the vehicle's medium and high-speed constant-speed driving, such as cruise control and other functions; the pure electric mode refers to the battery providing power to the drive motor, using the motor to directly drive the wheels. This mode is mainly used for the vehicle's starting, low-speed cruising, deceleration and other states.

[0038] The four-wheel drive mode of the vehicle requires the vehicle to always maintain a dynamic output mode, and in order to drive the four wheels, all the wheels are connected, and an intermediate differential is needed to adjust the speed difference between the front and rear wheels, which improves the stability of the vehicle on complex roads. It should be noted that the four-wheel drive mode is mainly divided into full-time four-wheel drive, part-time four-wheel drive and timely four-wheel drive. Among them, full-time four-wheel drive means that all wheels of the car move independently at any time, and can have good off-road and handling performance at any time, but cannot make adjustments to torque distribution according to road conditions; part-time four-wheel drive must be controlled by the driver to switch between two-wheel drive and four-wheel drive. The driver achieves the purpose of two-wheel drive or four-wheel drive by disconnecting or connecting the transfer case according to driving needs; timely four-wheel drive is a four-wheel drive system that only appears at the right time, and the computer chip detects the driving needs and controls the switching between two-wheel drive and four-wheel drive; because the front and rear axles of the four-wheel drive model are drive axles, each has a differential, but the transfer case of the part-time four-wheel drive system is only a connecting device and cannot play a role in eliminating the speed difference.

[0039] In the two-wheel drive mode of a vehicle, two wheels are responsible for driving, and the power is not as strong as that of a four-wheel drive vehicle. The two-wheel drive differential allows the left and right drive wheels to rotate at different speeds, and the stability control on complex roads is poor. The difference between front-wheel drive and rear-wheel drive is mainly the layout of the engine. Front-wheel drive vehicles mostly use transverse engines, while rear-wheel drive vehicles mostly use longitudinal engines. The front axle of a front-wheel drive vehicle is a shift drive axle, while the front axle of a rear-wheel drive vehicle is a steering axle and the rear axle is a drive axle. Front-wheel drive vehicles have poor handling and may suffer from understeer, while rear-wheel drive vehicles have good handling but are prone to oversteer on snow or slippery roads.

[0040] In an embodiment of the present application, detecting a current driving mode of a motor of an electric vehicle includes: acquiring a driving mode signal of the motor; and determining the current driving mode of the motor according to the driving mode signal.

[0041] It can be understood that the embodiment of the present application determines the current driving mode of the motor by acquiring the driving mode signal of the motor, so as to subsequently determine the target bridge currently driven by the motor according to the current driving mode.

[0042] It should be noted that the motor drive mode signal refers to the signal that controls the rotation of the drive motor. Its main function is to transmit the vehicle control unit's instructions in the form of a high-frequency PWM (Pulse width modulation) wave to the drive motor control module for processing, so as to achieve precise control of the drive motor.

[0043] In step S102 , the target bridge currently driven by the motor is determined according to the current driving mode.

[0044] Among them, the target electric axle can be an electric front axle and an electric rear axle, without specific limitation.

[0045] It can be understood that in the embodiment of the present application, due to the different current driving modes, the electric bridge currently driven by the motor is also different, and it needs to be determined according to the current driving mode to facilitate the subsequent judgment of whether the differential lock of the target electric bridge meets the locking conditions.

[0046] It should be noted that if the current driving mode is a pure electric front-wheel drive mode or a direct-drive front-wheel drive mode, the target electric axle currently driven by the motor can be the electric front axle; if the current driving mode is a pure electric rear-wheel drive mode or a direct-drive rear-wheel drive mode, the target electric axle currently driven by the motor can be the electric rear axle; if the current driving mode is a pure electric four-wheel drive mode or a direct-drive four-wheel drive mode, the target electric axle currently driven by the motor can be the electric front axle and the electric rear axle.

[0047] In step S103 , if the differential lock of the target axle meets the preset locking condition, the differential lock is controlled to be locked.

[0048] Among them, the preset locking conditions include: the current speed of the electric vehicle is less than the first preset speed; the wheel speed difference corresponding to the target axle is less than the preset value; the current driving mode of the electric vehicle is the preset driving mode; the current driving mode is the preset driving mode.

[0049] Among them, the first preset vehicle speed can be 5KPH, the preset value of the wheel speed difference can be 50RPM, the preset driving modes can include full-time four-wheel drive mode, snow driving mode, mud driving mode and sand driving mode, and the preset drive modes can include pure electric four-wheel drive mode and direct drive four-wheel drive mode. The above preset values ​​or modes can be specifically calibrated or adjusted according to actual conditions without specific limitations.

[0050] It can be understood that in the embodiment of the present application, only when the differential lock of the target electric axle satisfies the above four conditions at the same time, the differential lock is controlled to be locked, causing damage to the differential gear and other conditions to occur, so as to meet the use requirements of the vehicle in different situations and ensure driving safety.

[0051] Specifically, when the above locking conditions are met, the ECU (Electronic Control Unit, differential lock controller) will send the status value "0x1" for the instrument, differential lock switch, HCU (Hybrid Control Uni, vehicle controller), P4M (Positive Pulser Pulse Position Modulation, pulse transmission data encoding, i.e. motor signal) to perform logical judgment, and then further control the mechanical components of the electronically controlled differential lock to lock, where "0x1" indicates the locked state.

[0052] In an embodiment of the present application, after controlling the differential lock to lock, it also includes: detecting the current speed of the electric vehicle; if the current speed is greater than a second preset speed and less than a third preset speed, generating an overspeed alarm prompt, wherein the second preset speed is greater than the first preset speed, and the third preset speed is greater than the second preset speed; if the current speed is greater than or equal to the third preset speed, controlling the differential lock to unlock.

[0053] Among them, the second preset vehicle speed can be 30KPH, and the third preset vehicle speed can be 40KPH. They can be specifically calibrated according to actual conditions or after multiple driving experiments, and are not specifically limited.

[0054] It can be understood that in the embodiment of the present application, when the differential lock is in a locked state, if the current vehicle speed is within a set range, an overspeed alarm is generated. However, if the current vehicle speed exceeds the third preset speed, the differential lock is automatically controlled to be unlocked to avoid damage to the differential gear due to excessive vehicle speed.

[0055] It should be noted that in the embodiment of the present application, when the vehicle speed is greater than the third preset speed, the differential lock is automatically unlocked. However, when the vehicle speed drops back to the range of the second preset speed and the third preset speed after overspeeding unlocking, the differential lock will not be automatically locked again to prevent the differential lock from being damaged due to the vehicle speed frequently being at the critical value, thereby ensuring driving safety.

[0056] For example, in the differential lock state, when "30KPH<vehicle speed<40KPH", the ECU sends the status value "0x2" for the instrument, differential lock switch, HCU, and P4M to use for logical judgment. When the vehicle speed drops from "30KPH-40KPH" to below 28KPH (this parameter can be changed according to driving experience in the later calibration test), the status value sent by the ECU changes from "0x2=Over-speed Warning" to "0x1=Locked" for the instrument, differential lock switch, HCU, and P4M to use for logical judgment, where "0x2" is the overspeed alarm state.

[0057] In the embodiment of the present application, after controlling the differential lock to lock, it also includes: detecting the current driving mode of the electric vehicle; if the current driving mode is not a preset driving mode, controlling the differential lock to unlock.

[0058] It can be understood that in the embodiment of the present application, when it is detected that the current driving mode of the electric vehicle is not a preset driving mode, such as: standard driving mode, economic driving mode or sports driving mode, the differential lock is controlled to be unlocked. Since the differential lock of the present application is mainly used to cope with complex road surfaces such as snow, mud and sand, no specific limitation is made to ensure that the vehicle can successfully escape on complex road surfaces, avoid wheel slippage or tail swinging, and ensure driving safety.

[0059] It should be noted that the function of the differential lock is to improve the car's ability to pass on complex roads such as snow, mud and sand. That is, when one of the car's drive axles is idling, the differential can be quickly locked to make the two drive axles rigidly connected; in this way, most of the torque or even all of the torque can be transmitted to the non-slip drive axle, making full use of its adhesion to generate sufficient traction so that the car can continue to drive. Therefore, this application only needs to control the differential lock to be locked in the preset driving mode to enable the vehicle to escape from difficulties on complex roads.

[0060] In the embodiment of the present application, after controlling the differential lock to lock, it also includes: detecting whether the differential lock is faulty; if the differential lock is faulty, controlling the differential lock to unlock, and generating a differential lock fault alarm prompt.

[0061] It can be understood that when the embodiment of the present application detects a differential lock failure, that is, detects that the differential cross shaft is broken, the vehicle makes an abnormal noise, or when the vehicle starts, accelerates or decelerates, obvious backward movement and impact can be felt, turning is difficult, etc., it is judged based on the actual situation without specific limitation, then the differential lock is controlled to be unlocked, and a differential lock fault alarm is generated to remind the driver to check or repair in time to ensure subsequent driving safety.

[0062] In the embodiment of the present application, after controlling the differential lock to lock, the method further includes: detecting a manual unlocking signal of the differential lock; and controlling the differential lock to unlock according to the manual unlocking signal.

[0063] It can be understood that the embodiment of the present application can not only control the locking or unlocking of the differential lock according to the relevant signal, but also manually control the unlocking of the differential lock to meet the control requirements in different situations and ensure driving safety.

[0064] Specifically, when the differential lock is locked, use the differential lock switch to manually unlock it; the ECU will send the status value "0x0" for the instrument, differential lock switch, HCU, and P4M to perform logical judgment to achieve unlocking, where "0x0" is the unlocked state.

[0065] In summary, when the locking request of the differential lock is detected, the embodiment of the present application comprehensively considers the vehicle speed, wheel speed, driving mode and drive mode and other conditions, and automatically controls the locking of the differential lock when the preset locking conditions are met to meet the vehicle's usage requirements in different situations and ensure driving safety.

[0066] The specific control strategy will be described in detail below based on specific embodiments. The locking conditions are determined by comprehensively considering the differential lock situation, working environment, vehicle speed and wheel speed, working principle of the mechanical components of the differential lock, and assembly position. The details are as follows:

[0067] In embodiment 1, when a locking request of the differential lock is detected, it is detected that the motor driving mode is one of the pure electric four-wheel drive mode or the direct drive four-wheel drive mode, then the target electric axles currently driven by the motor are the electric drive front axle and the electric drive rear axle;

[0068] It is detected that the current vehicle speed is less than 5KPH, the wheel speed difference corresponding to the target electric axle is less than 50RPM, the driving mode is one of the full-time four-wheel drive mode, snow driving mode, mud driving mode or sand driving mode, and the motor drive mode is one of the pure electric four-wheel drive mode or direct drive four-wheel drive mode. The above conditions all meet the locking conditions, so the differential lock controller will send the status value "0x1" for the instrument, differential lock switch, HCU, and P4M to use for logical judgment, and then further control the differential lock of the electric drive rear axle to lock, where "0x1" is the locking state, as shown in Table 1 below.

[0069] Table 1 Definition of status signal values ​​sent by ECU

[0070]

[0071] Specifically, in the above Table 1, "0x0" is the unlocked state, "0x1" is the locked state, "0x2" is the speeding alarm state, "0x3" is the terrain mode selection error state, that is, the non-preset driving mode state, "0x4" is the locked refusal state, "0X5-0XD" is the reserved state, "0XE" is the differential lock failure state, and "0XF" is the invalid state, which can be understood as the reserved state and can be set according to the actual situation.

[0072] Embodiment 2: When it is detected that the current vehicle speed is greater than 5KPH or the wheel speed difference corresponding to the target electric axle is greater than 50RPM, or the driving mode is one of the standard driving mode, economic driving mode or sports driving mode, and the motor drive mode is one of the pure electric front drive mode, pure electric rear drive mode, direct drive rear drive mode or direct drive front drive mode, one or more of the above conditions do not meet the locking conditions, so the differential lock controller will send the status value "0x4" for the instrument, differential lock switch, HCU, P4M to perform logical judgment, and further control the differential lock of the electric drive rear axle to refuse to lock, where "0x4" is the lock refusal state.

[0073] Example 3, in the differential lock state, when "30KPH<vehicle speed<40KPH", the differential lock ECU sends a status value "0x2" for the instrument, differential lock switch, HCU, and P4M to use for logical judgment, and an overspeed alarm is issued at this time; but when the vehicle speed drops from "30-40KPH" to below 28KPH (this parameter can be changed according to driving experience in the later calibration test), the status value sent by the ECU changes from "0x2=Over-speed Warning" to "0x1=Locked" for the instrument, differential lock switch, HCU, and P4M to use for logical judgment.

[0074] Embodiment 4: When the vehicle speed is greater than 40KPH, the differential lock is automatically unlocked.

[0075] After overspeed unlocking, when the vehicle speed drops below 40KPH again, the differential lock will not automatically lock again to prevent the vehicle speed from frequently reaching the critical value and causing damage to the differential lock, ensuring driving safety. After meeting this condition, the differential lock ECU will send the status value "0x0" for the instrument, differential lock switch, HCU, and P4M to use for logical judgment to achieve unlocking, where "0x0" is the unlocking state.

[0076] Embodiment 5: When the differential lock is locked, the differential lock switch is used to manually unlock the differential lock.

[0077] The differential lock ECU will send the status value "0x0" for the instrument, differential lock switch, HCU, and P4M to use for logical judgment to achieve unlocking.

[0078] Example 6: When the differential lock is locked or the speeding alarm is on, the vehicle driving mode is switched to one of the standard driving mode, economic driving mode or sports driving mode. The ECD will send a status value of "0x0" for the instrument, differential lock switch, HCU, and P4M to perform logical judgment to achieve unlocking.

[0079] Example 7: When the system hardware / software fails, the differential lock ECU will send a fault alarm signal. Output: The differential lock system sends "0xE" through the status value for the instrument, differential lock switch, HCU, P4M and ESP (Electronic Stability Program) to use for logical judgment.

[0080] In summary, the differential lock controller receives the vehicle speed, wheel speed, HCU signal, button status and fault status through the CAN bus to control the locking and unlocking of the differential lock; when the CAN communication is normal and the vehicle speed, wheel speed difference, HCU signal, button status meet the requirements and the product self-test has no faults, the differential lock is allowed to lock; the differential lock ECU sends a status signal to control the action of the differential lock mechanical parts or provide status feedback, assisting the driver to complete the electronic differential lock control, achieve rigid connection between the left and right half-axles, and control the vehicle out of trouble.

[0081] Figure 2 is a block diagram of a differential lock control device provided in an embodiment of the present application;

[0082] like Figure 2 As shown, the control device 10 of the differential lock includes: a detection module 100 , a processing module and a control module 300 .

[0083] Among them, the detection module 100 is used to detect the current driving mode of the motor of the electric vehicle when a locking request of the differential lock is detected; the processing module 200 is used to determine the target axle currently driven by the motor according to the current driving mode; the control module 300 is used to control the differential lock to lock if the differential lock of the target axle meets the preset locking conditions.

[0084] Among them, the preset locking conditions include: the current speed of the electric vehicle is less than the first preset speed; the wheel speed difference corresponding to the target axle is less than the preset value; the current driving mode of the electric vehicle is the preset driving mode; the current driving mode is the preset driving mode.

[0085] In the embodiment of the present application, the detection mode 100 is further used to: obtain a driving mode signal of the motor; and determine the current driving mode of the motor according to the driving mode signal.

[0086] In an embodiment of the present application, the control module 300 is further used to: detect the current speed of the electric vehicle; if the current speed is greater than a second preset speed and less than a third preset speed, generate an overspeed alarm prompt, wherein the second preset speed is greater than the first preset speed, and the third preset speed is greater than the second preset speed; if the current speed is greater than or equal to the third preset speed, control the differential lock to unlock.

[0087] In the embodiment of the present application, the control module 300 is further used to: detect the current driving mode of the electric vehicle; if the current driving mode is not a preset driving mode, control the differential lock to unlock.

[0088] In the embodiment of the present application, the control module 300 is further used to: detect whether the differential lock is faulty; if the differential lock is faulty, control the differential lock to be unlocked, and generate a differential lock fault alarm prompt.

[0089] In the embodiment of the present application, the control module 300 is further used to: detect a manual unlocking signal of the differential lock; and control the differential lock to unlock according to the manual unlocking signal.

[0090] In summary, when the locking request of the differential lock is detected, the embodiment of the present application comprehensively considers the vehicle speed, wheel speed, driving mode and drive mode and other conditions, and automatically controls the locking of the differential lock when the preset locking conditions are met to meet the vehicle's usage requirements in different situations and ensure driving safety.

[0091] Figure 3 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application. The vehicle may include:

[0092] A memory 301 , a processor 302 , and a computer program stored in the memory 301 and executable on the processor 302 .

[0093] When the processor 302 executes the program, the control method of the differential lock provided in the above embodiment is implemented.

[0094] Furthermore, the vehicle also includes:

[0095] The communication interface 303 is used for communication between the memory 301 and the processor 302 .

[0096] The memory 301 is used to store computer programs that can be run on the processor 302 .

[0097] The memory 301 may include a high-speed RAM (Random Access Memory) memory, and may also include a non-volatile memory, such as at least one disk memory.

[0098] If the memory 301, the processor 302 and the communication interface 303 are implemented independently, the communication interface 303, the memory 301 and the processor 302 can be connected to each other through a bus and communicate with each other. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 3 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0099] Optionally, in a specific implementation, if the memory 301, the processor 302 and the communication interface 303 are integrated on a chip, the memory 301, the processor 302 and the communication interface 303 can communicate with each other through an internal interface.

[0100] The processor 302 may be a CPU (Central Processing Unit), or an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present application.

[0101] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon, which implements the above differential lock control method when the program is executed by a processor.

[0102] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0103] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0104] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for controlling a differential lock, characterized in that: The method comprises: When a locking request of the differential lock is detected, detecting a current driving mode of a motor of the electric vehicle; Determine a target bridge currently driven by the motor according to the current driving mode; If the differential lock of the target axle meets a preset locking condition, the differential lock is controlled to be locked.

2. The method according to claim 1, characterized in that The preset locking conditions include: The current speed of the electric vehicle is less than a first preset speed; The wheel speed difference corresponding to the target axle is less than a preset value; The current driving mode of the electric vehicle is a preset driving mode; The current driving mode is a preset driving mode.

3. The method according to claim 2, characterized in that After controlling the differential lock to lock, the method further includes: Detecting the current speed of the electric vehicle; If the current vehicle speed is greater than a second preset vehicle speed and less than a third preset vehicle speed, an overspeed alarm is generated, wherein the second preset vehicle speed is greater than the first preset vehicle speed, and the third preset vehicle speed is greater than the second preset vehicle speed; If the current vehicle speed is greater than or equal to the third preset vehicle speed, the differential lock is controlled to be unlocked.

4. The method according to claim 1 or 2, characterized in that: After controlling the differential lock to lock, the method further includes: detecting a current driving mode of the electric vehicle; If the current driving mode is not the preset driving mode, the differential lock is controlled to be unlocked.

5. The method according to claim 1 or 2, characterized in that: After controlling the differential lock to lock, the method further includes: Detecting whether the differential lock is faulty; If the differential lock fails, the differential lock is controlled to be unlocked, and a fault alarm prompt of the differential lock is generated.

6. The method according to claim 1, characterized in that After controlling the differential lock to lock, the method further includes: detecting a manual unlocking signal of the differential lock; The differential lock is controlled to be unlocked according to the manual unlocking signal.

7. The method according to claim 1, characterized in that The detecting the current driving mode of the motor of the electric vehicle comprises: Acquiring a driving mode signal of the motor; A current driving mode of the motor is determined according to the driving mode signal.

8. A control device for a differential lock, characterized in that: The device comprises: a detection module, configured to detect a current driving mode of a motor of the electric vehicle when a locking request of a differential lock is detected; A processing module, configured to determine a target bridge currently driven by the motor according to the current driving mode; The control module is used for controlling the differential lock to lock if the differential lock of the target axle meets a preset locking condition.

9. A vehicle, characterized in that: The vehicle comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the differential lock control method according to any one of claims 1 to 7.

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, the method according to any one of claims 1 to 7 is implemented.

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