Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1992-07-17
1993-09-07
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
188181A, 303108, 303109, 303110, 3031192, 303900, 36442602, B60T 866, B60T 870
Patent
active
052422160
ABSTRACT:
The antilock brake control apparatus has a locking symptom detector for detecting a wheel locking symptom and a removal of wheel locking symptom. A microcomputer is provided for producing a depressurization signal in response to the detection of the wheel locking symptom until the removal of the wheel locking symptom, and for calculating, after a locking symptom is detected, a pressure difference between the current wheel cylinder pressure and the wheel cylinder pressure when a locking symptom is first detected to obtain a maximum pressure difference at a time when the removal of the wheel locking symptom is detected. The microcomputer further produces a slow pressurization signal in response to the removal of the wheel locking symptom and during an asynchronous state, in which a difference between the wheel speed and the estimated vehicle speed is more than a predetermined range, and a rapid pressurization signal in response to the establishment of the synchronous state, in which the difference is within the predetermined range, and until the wheel cylinder pressure is increased to gain a predetermined percentage of the maximum pressure difference.
REFERENCES:
patent: 3787094 (1974-01-01), Harned et al.
patent: 4585280 (1986-04-01), Leiber
patent: 4693522 (1987-09-01), Wupper et al.
patent: 4973108 (1990-11-01), Maki et al.
patent: 5033799 (1991-07-01), Braschel
patent: 5076538 (1991-12-01), Mohr et al.
patent: 5116109 (1992-05-01), Kuwama et al.
Patent Abstracts on Japan, vol. 10, No. 253, (M-152) (2309), Aug. 29, 1986.
Fujioka Hideaki
Miyawaki Yoichi
Butler Douglas C.
Sumitomo Electric Industries Ltd.
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