Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1991-05-20
1992-10-20
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303116SP, 303119R, 303DIG5, 303DIG6, B60T 832, B60T 844, B60T 848, B60K 2816
Patent
active
051564483
ABSTRACT:
A hydraulic brake system with an anti-skid system (ABS) and traction control (ASR) for motor vehicles having a hydraulic unit with at least one control valve and a return pump with at least one pump element embodied as self-aspirating, which element is operative in the brake circuit containing the at least one driven wheel. To furnish brake pressure during traction control, a valve assembly is provided. For the sake of simplicity in the embodiment of this valve unit, it has not only a charge valve disposed in an intake line between the pump element and the brake fluid tank but also a reversing valve, incorporated between the master brake cylinder and the control valve and having three hydraulic control inlets and a restoring spring, of which one control inlet communicate with the outlet of the pump element, and the two control inlets counteracting this control element communicate with the valve inlet and outlet, respectively. A check valve having a parallel throttle provides for an adequate pressure difference for reversal of the reversing valve upon a buildup of pressure at the outlet of the pump element.
REFERENCES:
patent: 4818039 (1989-04-01), Bertling et al.
patent: 4861116 (1989-08-01), Bernhardt et al.
patent: 4900102 (1990-02-01), Jonner et al.
patent: 4921313 (1990-05-01), Arikawa
patent: 4940293 (1990-07-01), Burckhardt et al.
patent: 5026127 (1991-06-01), Arikawa
Butler Douglas C.
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
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