Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1992-12-18
1995-04-04
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303104, 303DIG4, B60T 858
Patent
active
054030757
ABSTRACT:
An antilock brake control apparatus is provided for adjusting the wheel cylinder pressure with actuators that include on/off-type valves. The antilock brake control apparatus includes wheel speed detectors for detecting the speed of each wheel, a wheel speed and estimated vehicle speed calculation device for calculating the wheel and vehicle behavior, and a locking symptoms detection device for detecting wheel locking symptoms and recovery from a wheel locking condition. A target pressure setting device for setting a target pressure, which is the estimated value of the wheel cylinder pressure during antilock brake control, based on a wheel cylinder pressure and a locking symptoms detection edge, is also provided. Further, a pressurization signal setting device for setting a pressurization signal used to drive the actuators based on the target pressure is provided. The antilock brake control apparatus reduces the effects of pressure pulsations caused by operation of the on/off valves and, thus, enables high precision wheel cylinder pressure control.
REFERENCES:
patent: 4585280 (1986-04-01), Leiber
patent: 4887784 (1989-11-01), Leppek
patent: 4900099 (1990-02-01), Braschel
patent: 5154494 (1992-10-01), Kost et al.
patent: 5207484 (1993-05-01), Bleckman et al.
Graham Matthew C.
Sumitomo Electric Industries Ltd.
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