Vehicle anti-lock breaking control

Details Vehicle anti-lock breaking control Vehicle anti-lock breaking control

1983-04-27

1985-07-16

Shoop, William M.

Boots, shoes, and leggings

303 93, 303 97, 303 99, B60T 808

Patent

active

045300593

ABSTRACT:
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.

REFERENCES:
patent: 3889128 (1975-06-01), Luhdorff
patent: 4193642 (1980-03-01), Miller

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