Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1990-12-05
1992-10-20
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303116R, B60T 832, B60T 844
Patent
active
051564491
ABSTRACT:
A hydraulic dual-circuit brake system with an anti-skid system (ABS) and traction control (ASR) for motor vehicles has a four-channel hydraulic unit with control valves and a return pump with two separate pumping elements for each brake circuit. To supply brake pressure in traction control operation, an additional unit is provided having a charging valve for connecting a self-aspirating pumping element of the return pump to the brake fluid tank and a reversing valve disposed in the connection between this pumping element and the master brake cylinder. For a rapid buildup of brake pressure in traction control, given wheel brake cylinders requiring a large brake fluid volume, a reservoir is provided connected to the brake pressure supply circuit by a reservoir connection valve via the reversing valve. Via a check valve between the reservoir and the reservoir connection unit, with a parallel-connected pressure limiting valve, the reservoir is switched off automatically whenever the pressure in the brake pressure supply circuit exceeds the instantaneous reservoir pressure.
REFERENCES:
patent: 4627671 (1986-12-01), Matsui et al.
patent: 4715663 (1987-12-01), Hattori et al.
patent: 4846532 (1989-07-01), Friedow et al.
patent: 4900102 (1990-02-01), Jonner
patent: 4921313 (1990-05-01), Arikawa
patent: 5040852 (1991-08-01), Takata
Graham Matthew C.
Greigg Edwin E.
Greigg Ronald E.
Poon Peter M.
Robert & Bosch GmbH
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