Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1991-11-01
1993-04-27
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031161, 3031191, B60T 832, B60K 2816
Patent
active
052056236
ABSTRACT:
A hydraulic brake system having an anti-lock system (ABS) and traction control (ASR) for motor vehicles including a hydraulic unit with at least one control valve and a return pump having at least one pump element that is embodied as self-aspirating pump element and that is operative in a brake circuit, which contains at least one drive wheel. A valve assembly serves to furnish brake pressure in ASR and each valve assembly comprises a respective charging valve embodied as a 2/2-way magnet valve and an electromagnetic reversing valve. In order that a low hydraulic power requirement can be attained in traction control, only the valve assembly is triggered, and is triggered such that for pressure buildup the electromagnetic reversing valve blocks fluid flow and the charging valve is opened, while for pressure holding both valves block fluid flow, and for pressure reduction the charging valve blocks fluid flow and the electromagnetic reversing valve is opened.
REFERENCES:
patent: 4861118 (1989-08-01), Burckhardt et al.
patent: 4900102 (1990-02-01), Johner et al.
patent: 5015043 (1991-05-01), Rasch
Holzmann Roland
Willmann Karl-Heinz
Butler Douglas C.
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
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