Four-wheel drive control method

Abstract

The invention relates to a four-wheel drive control method which comprises the following steps: adjusting a vehicle front and rear axle distribution coefficient when the energy consumption is lowest based on a vehicle driving state and an accelerator change condition; determining a P2 motor target gear, the system efficiency between the P2 motor and a gearbox and the system efficiency of a P4 motor assembly based on the vehicle front and rear axle distribution coefficient when the energy consumption is lowest; based on the vehicle driving state, the system efficiency between the P2 motor and the gearbox and the system efficiency of the P4 motor assembly, the rotating speed of the P4 motor and the rotating speed of the P2 motor at the target gear are determined; and the working mode of the P2 motor is determined based on the rotating speed of the P2 motor at the target gear and the vehicle accelerator change condition. On the basis of selection of the gear of the gearbox and the mode of the P2 motor, the effect similar to a disengagement device can be achieved while the hardware cost is not increased, and the optimal economical efficiency is considered while the requirement for power is met.

Claims

1. A four-wheel drive control method, wherein the four-wheel drive includes a P2 motor and a P4 motor, characterized in that: The method includes: Obtain the vehicle's driving status and throttle changes, and adjust the vehicle's front and rear axle distribution coefficient based on the lowest energy consumption; Based on the front and rear axle distribution coefficients of the vehicle, determining the target gear of the P2 motor, the system efficiency between the P2 motor and the gearbox, and the system efficiency of the P4 motor assembly; Determining the P4 motor speed and the P2 motor speed at the target gear position based on the vehicle driving state, the system efficiency between the P2 motor and the gearbox, and the system efficiency of the P4 motor assembly; The operating mode of the P2 motor is determined based on the speed of the P2 motor placed in the target gear and the change in the vehicle throttle.

2. A four-wheel drive control method as claimed in claim 1, characterized in that: In the vehicle front and rear axle distribution coefficient based on the lowest energy consumption, if the front axle coefficient is 0, the target gear position of the P2 motor is set to N gear, and the vehicle is driven by the P4 motor.

3. A four-wheel drive control method as claimed in claim 2, characterized in that: The rotation speed of the P2 motor is obtained, and it is determined whether the rotation speed of the P2 motor is greater than a first threshold value. In response to the rotation speed of the P2 motor being less than the first threshold value, the working mode of the P2 motor is set to a ready state mode.

4. A four-wheel drive control method as claimed in claim 3, characterized in that: Obtain changes in vehicle speed and vehicle throttle, and determine whether the vehicle speed is greater than a second threshold and whether the change in the vehicle throttle exceeds a third threshold; In response to the vehicle speed being greater than the second threshold value, and the vehicle throttle change being greater than the third threshold value, the P2 motor operation mode is adjusted from the preparation state mode to the speed control mode, and the P2 motor speed is adjusted according to the target gear of the P2 motor until the speed difference between the P2 motor speed and the target shaft speed is less than the fourth threshold value, and the P2 motor operation mode is adjusted from the speed control mode to the torque control mode, and the P2 motor is shifted; In response to the vehicle speed being lower than the second threshold and / or the change in the vehicle throttle being lower than the third threshold, the current state of the vehicle is maintained.

5. A four-wheel drive control method as claimed in claim 3, characterized in that: In response to the rotation speed of the P2 motor being greater than a first threshold, adjusting the working mode of the P2 motor from a ready state mode to a torque control mode; The changes in vehicle speed and vehicle throttle are obtained, and in response to the vehicle speed being greater than a second threshold and the change in vehicle throttle exceeding a third threshold, the P2 motor is shifted according to the target gear of the P2 motor, and torque compensation is performed on the P2 motor at the same time.

6. A four-wheel drive control method as claimed in claim 1, characterized in that: In the vehicle front and rear axle distribution coefficient based on the lowest energy consumption, if the front axle coefficient is not 0, the P2 motor working mode is set to the torque control mode, and the P2 motor cooperates with the P4 motor to drive the vehicle.

7. A four-wheel drive control device, the four-wheel drive includes a P2 motor and a P4 motor, characterized in that: The device includes: Vehicle front and rear axle distribution coefficient determination module: Based on the real-time vehicle driving status and throttle changes, the vehicle front and rear axle distribution coefficient is adjusted in real time when the energy consumption is the lowest; Motor gear and efficiency determination module: Based on the front and rear axle distribution coefficient of the vehicle when the energy consumption is the lowest, it determines the target gear of the P2 motor, the system efficiency between the P2 motor and the gearbox, and the system efficiency of the P4 motor assembly; A motor speed determination module: determines the P4 motor speed and the P2 motor speed at the target gear position based on the real-time vehicle driving state, the system efficiency between the P2 motor and the gearbox, and the system efficiency of the P4 motor assembly; The motor working mode determination module determines the P2 motor working mode based on the P2 motor speed at the target gear and the vehicle throttle change.

8. A vehicle, characterized in that: Comprising the control device as claimed in claim 7.

9. A computer device comprising: at least one processor; as well as a memory communicatively connected to the at least one processor; wherein, The memory stores computer instructions that can be executed by the at least one processor, and the computer instructions are executed by the at least one processor to enable the at least one processor to perform the method according to any one of claims 1 to 6.

10. A computer-readable storage medium having computer instructions stored thereon, characterized in that: The computer instructions are used to enable a computer to execute the method according to any one of claims 1 to 6.

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