Method of preventing skid of wheels of a vehicle

Details Method of preventing skid of wheels of a vehicle Method of preventing skid of wheels of a vehicle

1980-10-16

1984-05-01

Truhe, J. V.

Boots, shoes, and leggings

303105, 303106, B60T 808

Patent

active

044465220

ABSTRACT:
A method of preventing wheels of a vehicle from skidding, including the steps of detecting the peripheral speed of a wheel and picking it up as a wheel-speed signal, detecting the vehicle speed and setting a reference wheel-speed signal based on the detected vehicle speed, deriving a wheel-acceleration signal from said wheel-speed signal, and setting a reference wheel-deceleration signal for comparison with said wheel-acceleration signal. During braking operation, the brake torque applied to the wheel is controlled such that it is maintained constant to prevent the further increase thereof when the level of the wheel-accleration signal decreases below the level of said wheel-deceleration signal under the condition that the level of said wheel-speed signal is higher than that of said reference wheel-speed signal. On the other hand, if the level of said wheel-speed signal is lower than that of said reference wheel-speed signal, the brake torque is reduced when the level of said wheel-acceleration signal decreases below the level of said reference wheel-deceleration signal. Preferably, in order to make much finer and more accurate control over the brake torque, various reference signals are set for comparison with said vehicle-speed signal, said wheel speed signal and said wheel-acceleration signal, and logical judgements are made on the respective signals. In addition, peripheral speeds of a plurality of wheels are preferably detected and the greatest peripheral speed thereof is used for estimation of said vehicle speed.

REFERENCES:
patent: 4129342 (1978-12-01), Sato et al.
patent: 4266833 (1981-05-01), Sato et al.

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