Vehicle anti-lock breaking control

摘要

A vehicle anti-lock brake control system includes wheel speed sensors which input speed signals to a microprocessor via an interface circuit. The microprocessor is programmed to calculate the deceleration of each wheel, compare this with a threshold and output a signal to a brake release device (A,B,C) for as long as the deceleration exceeds the threshold. The threshold level is calculated by the microprocessor as a function of the time elapsed since the threshold deceleration is exceeded. Initially the threshold is relatively low, but rises with time elapsed. After a predetermined time interval the threshold falls to a new relatively low level which depends on the slip of the wheel. If the slip of the wheel remains higher than a set level following re-application of the brake, a low "fast re-trigger" threshold level is established so as to release the brakes again rapidly if excessive deceleration is again detected.