Torque control method and system for automobile and its sand mode

Abstract

The invention discloses an automobile and a sand land mode torque control method and system thereof. The control method comprises the following steps that after the automobile enters a sand land mode,the current automobile speed, the steering angle of a steering wheel and the gradient of a current road where the automobile is located are obtained; the front and rear axle torque of the automobileis adjusted according to the current automobile speed, the steering angle of the steering wheel and the gradient of the current road. According to the control method, the automobile can be actively controlled according to the current running state of the automobile so that the front and rear axle torque can be reasonably distributed, the driving force can be fully exerted under extreme working conditions such as a desert, the slipping rate is reduced, and the off-road performance of the automobile is improved.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a torque control method of an automobile in a sandy terrain mode, a torque control system in an automobile sandy terrain mode and an automobile. Background technique [0002] In the related art, the sand mode of the vehicle is to limit the torque output of the whole vehicle by controlling the slip ratio. Specifically, the power is distributed to the front and rear wheels through the central differential lock and differential, and then the braking system participates in the distribution of power to the high-attached wheels, so as to achieve the purpose of getting out of trouble. [0003] Among them, the central differential of the four-wheel drive vehicle in sand mode is usually divided into two categories: [0004] One is the locking differential. Usually, the locking differential can be artificially selected to achieve the purpose of solid connection of the front and rear ...

AI Technical Summary

Problems solved by technology

Disadvantages: High-speed driving and paved road driving are not suitable for use

Disadvantages: high requirements on the braking system, difficult to match

[0006] However, the above-mentioned limited-slip differential and locking differential are single power sources that transmit power to the front and rear wheel ends through the drive shaft, central differential, and differential locks, that is, independent control of the front and rear axles cannot be achieved. There is a feature that the front and rear axles cannot be actively adjusted, and often can only be adjusted in a fixed ratio or passively adjusted in the case of slipping, which makes it difficult to get out of trouble in conditions with variable terrain and high resistance (such as in the desert).

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