Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1993-03-17
1994-09-27
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031143, B60T 844, B60T 1358
Patent
active
053502256
ABSTRACT:
In a brake-pressure control device for a road vehicle, having an antilock braking system whose braking device comprises a vacuum brake power assist unit which has a vacuum chamber connected to the intake stub of the vehicle engine and a working chamber which can be subjected to a higher pressure via a control element operable by the brake pedal, a position sensor is provided which detects the position of the brake pedal and generates output signals. An electronic control unit processes these signals and generates drive signals for a brake-pressure control device making it possible to couple into the wheel brakes a higher brake pressure than would otherwise correspond to the instantaneous pedal position. Such driving of the brake-pressure control device is triggered when the speed .PHI. at which the brake pedal is operated overshoots a prescribed threshold value .PHI..sub.s. The brake power assist unit is provided with a solenoid valve arrangement which can be moved from a basic position in which pressure compensation can be performed between the vacuum chamber and the working chamber of the brake power assist unit, whereas the working chamber thereof can be connected only via the control element to the outside atmosphere, into a functional position in which the working chamber is subjected to the ambient pressure but is blocked off from the vacuum chamber.
REFERENCES:
patent: 4057301 (1977-11-01), Foster
patent: 4768841 (1988-09-01), Watanabe
patent: 5031970 (1991-07-01), Vogel
patent: 5158343 (1992-10-01), Reichelt et al.
Nell Joachim
Steiner Manfred
Mercedes-Benz AG
Muratori Alfred
Oberleitner Robert J.
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