Hydraulic dual-circuit brake system

Details Hydraulic dual-circuit brake system Hydraulic dual-circuit brake system

1992-01-13

1993-05-18

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

3031161, 3031191, 180197, B60T 832, B60T 844, B60T 848, B60K 2816

Patent

active

052114546

ABSTRACT:
A hydraulic dual-circuit brake system, with an anti-skid system (ABS) and traction control (ASR) for motor vehicles having a four-channel hydraulic unit with control valves, a return pump with two separate pump elements for each brake circuit, and two low-pressure reservoirs connected to the inlets of the pump elements. For supplying brake pressure in the traction control mode, at least one brake fluid reservoir is provided, which communicates with a pump element assigned to a brake circuit having at least one driven wheel, and a reversing valve is disposed in each connecting line between the master brake cylinder and the outlet of such a pump element. For the sake of problem-free initiation of braking during the traction control mode without the danger of unstable driving conditions, the brake fluid reservoir is embodied as an active, controllable reservoir, and the reversing valve is embodied such that in its reversed position a check valve having a blocking direction toward the master brake cylinder is operative.

REFERENCES:
patent: 4826258 (1989-05-01), Ocvirk et al.
patent: 4846532 (1989-07-01), Friedow et al.
patent: 4861118 (1989-08-01), Burckhardt et al.
patent: 5026127 (1991-06-01), Arikawa
patent: 5123716 (1992-06-01), Willmann

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