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

1979-01-05

1981-05-12

Beha, Jr., William H.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303110, B60T 808

Patent

active

042668336

ABSTRACT:
A method of preventing wheels of a vehicle from skidding in which a wheel-acceleration signal representative of the peripheral acceleration of a wheel is obtained by differentiating a wheel-shaped signal representative of a suitably detected peripheral speed of the wheel. The braking torque applied to the wheel during braking is controlled and held constant when the level of a wheel-acceleration signal is higher than that of a first reference wheel-acceleration signal and lower than that of a second reference wheel-acceleration signal, whereas it is increased when the level of the wheel-acceleration signal is higher than that of the second reference wheel-acceleration signal. A reference wheel-speed signal, representative of a predetermined reference wheel speed, and a reference wheel-deceleration signal are set for comparison with the wheel-speed signal and the wheel-acceleration signal, respectively, and the brake torque is held constant when the level of the wheel-acceleration signal is higher than that of the reference wheel-deceleration signal and lower than that of the second reference wheel-acceleration signal if the level of the wheel-speed signal is lower than that of the reference wheel-speed signal. The brake torque is further controlled to increase when the level of the wheel-acceleration signal is higher than that of the second reference wheel-acceleration signal.

REFERENCES:
patent: 3744851 (1973-07-01), Burckhardt et al.
patent: 3863993 (1975-02-01), Fleischer et al.
patent: 3874741 (1975-04-01), Schnaibel et al.

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