Automobile anti-skid system and its control method

Abstract

The invention relates to the technical field of control over a driving and braking system of an all-wheel driving cross-country car, in particular to an antiskid system of a car and a control method of the antiskid system. When the speed is lower than a set value, if the slippage rate of a wheel at any side reaches the control threshold value of a driving antiskid control system, the driving antiskid control system and a limited slip differential operate simultaneously; and if the slippage rates of the wheels on the two sides are both smaller than the control threshold value of the driving antiskid control system, the limited slip differential operates while the driving antiskid control system does not operate. When the speed is higher than the set value, if the slippage rate of the wheel at any side reaches the control threshold value of the driving antiskid control system, the driving antiskid control system and the limited slip differential operate simultaneously; and if the slippage rates of the wheels on the two sides are both smaller than the control threshold value of the driving antiskid control system, the limited slip differential operates while the driving antiskid control system does not operate. Through the combined operation of the limited slip differential and the driving antiskid control system, the utilization rate of engine torque is increased, the driving power of the whole vehicle is utilized to the greatest extent, and the cross-country capacity of the whole vehicle is improved.

Description

technical field [0001] The invention relates to the technical field of driving and braking system control of an all-wheel drive off-road vehicle, in particular to a vehicle anti-skid system and a control method thereof. Background technique [0002] The ability to pass on off-road surfaces is one of the important indicators for examining the performance of off-road vehicles. Common off-road vehicles usually only use one of the limited-slip differential or drive anti-skid control system to control the anti-skid of the vehicle. Although it can play an anti-skid effect in some cases, it is impossible for vehicles to pass under some special working conditions (large twisted road surfaces). [0003] Vehicles that are only controlled by the drive anti-skid control system ASR are in constant torque limiting and braking conditions, which increases the energy consumption of the vehicle. And the ASR working alone will greatly increase the wear and tear of the brake system, increase t...

AI Technical Summary

Problems solved by technology

Although it can play an anti-skid effect in some cases, it is impossible for vehicles to pass under some special conditions (large twisted road surfaces)

[0003] Vehicles that are only controlled by the drive anti-skid control system ASR, the vehicle is in constant torque limiting and braking conditions, which increases the energy consumption of the vehicle

And ASR working alone will greatly increase the wear and tear of the braking system, increase the maintenance cost of the whole vehicle, and bring hidden dangers to safety at the same time

[0004] For vehicles that only use the limited slip differential (LSD) for control, LSD can only have anti-skid effects on roads with little difference in left and right adhesion coefficients (3:1). If the left and right adhesion differences are too large, the low adhesion wheels will still slip

[0005] Therefore, no matter whether the anti-slip control system ASR or the limited slip differential LSD is used to control the anti-slip of the vehicle, the effect is not ideal.

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