Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1975-11-20
1977-07-26
Kunin, Stephen G.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 97, 303105, B60T 810
Patent
active
040378829
ABSTRACT:
An anti-lock brake control circuit compares the deceleration of a braked wheel with a deceleration reference and integrates the difference when wheel deceleration exceeds the reference deceleration. A resulting velocity error signal is compared with a velocity error reference and a release signal is generated while the velocity error signal exceeds the velocity error reference. Adaptive control is provided by a first order lag circuit having wheel velocity as its input and which supplies a variable portion of the deceleration reference having a slope approximately equal to the slope of the vehicle velocity profile during braking on low coefficient surfaces and having a slope less than the slope of the vehicle velocity profile during braking on high coefficient surfaces. An initial cycle and pulse circuit sets the velocity error reference to a high level for both the first cycle of anti-lock brake operation and for a time period after each brake application during anti-lock brake operation.
REFERENCES:
patent: 3523712 (1970-08-01), Leiber
patent: 3578819 (1971-05-01), Atkins
patent: 3604761 (1971-09-01), Okamoto et al.
patent: 3640588 (1972-02-01), Carp et al.
patent: 3709567 (1973-01-01), Van Ostrom et al.
patent: 3756662 (1973-09-01), Kuwana
patent: 3758166 (1973-09-01), Kuwana et al.
patent: 3870376 (1975-03-01), Riordan
patent: 3889128 (1975-06-01), Luhdorff
patent: 3922022 (1975-11-01), Ochiai
Conkey Howard N.
General Motors Corporation
Kunin Stephen G.
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