Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1990-12-17
1992-09-29
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
188181A, 188181C, 188358, 188349, 303 962, 303 92, 303113SS, 303113AP, 303115PP, 303116R, 303119R, 303117, 303DIG3, 303DIG4, B60T 834, B60T 848, B60T 1312, B60K 2816
Patent
active
051509512
ABSTRACT:
A hydraulic dual-circuit brake system for a road vehicle with front-axle/rear-axle brake circuit division has a tandem main cylinder as a brake device. The primary output pressure space of the cylinders is associated with the front-axle brake circuit, and the secondary output pressure space of the cylinders is associated with the rear-axle brake circuit. A pressure modulator adjusts the front-axle/rear-axle braking force distribution in the direction of an approach to the, in each case, ideal braking force distribution, as a braking-pressure actuator for the rear-axle brake circuit. The pressure modulator has a drive pressure space, by the charging of which with the output pressure of an auxiliary pressure source under solenoid valve control, a braking pressure which can be coupled into the rear-wheel brakes can be built up in an output pressure space of the pressure modulator. This output pressure space is also connected to the output pressure space of the brake device provided for the rear-axle brake circuit. During normal braking action, the output pressure space of the pressure modulator is blocked off against the output pressure space of the brake device, and the pressure build-up in the rear-axle brake circuit is exclusively effected by the pressure modulator which is driven in the direction of a servo control for which a set point P.sub.s correlated with the braking pressure in the front-axle circuit as ideal or almost ideal value is utilized as a reference variable.
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Klinkner Walter
Leiber Heinz
Steiner Manfred
Butler Douglas C.
Mercedes-Benz AG
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