Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1978-04-26
1980-01-15
Kunin, Stephen G.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
188181A, 303 20, 303 97, 303114, B60T 802
Patent
active
041835883
ABSTRACT:
A skid control system and method for use in conjunction with a vacuum-boosted hydraulic brake system of the type presently used in automotive passenger vehicles. The velocity of each monitored vehicle wheel is sensed and a signal indicative of wheel deceleration is derived. A skid control valve is connected to the vacuum booster of the brake system to vent the booster vacuum chamber to the atmosphere when an excessive wheel deceleration is detected at any one of the monitored wheels and thereby relieve brake pressure at all of the monitored wheels. When the wheel begins to speed back up to vehicle speed, the skid control valve is pulsed by a control signal having a predetermined frequency and having a duty cycle which increases a function of time over a predermined control period. In this manner, the brake pressure at the monitored wheels is gradually increased as a function of time until the brake pressure desired by the vehicle operator is again achieved.
REFERENCES:
patent: 3558197 (1971-01-01), Lueck et al.
patent: 3637264 (1972-01-01), Leiber et al.
patent: 3653725 (1972-04-01), Hayes et al.
patent: 3794389 (1974-02-01), Davis et al.
patent: 3880474 (1975-04-01), Scharlack
patent: 4060285 (1977-11-01), Jones
Kunin Stephen G.
Motor Wheel Corporation
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