Hydraulic dual-circuit brake system

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

1991-12-14

1992-04-07

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

188181A, 303116SP, 303119R, 303116R, B60K 2816, B60T 844, B60T 848, B60T 1316

Patent

active

051022052

ABSTRACT:
A hydraulic dual-circuit brake system with anti-skid braking (ABS) and traction control (ASR) for motor vehicles having control valve assemblies, each control valve assigned to one wheel brake cylinder of a vehicle wheel for feeding a wheel-slip-dependent brake pressure, and includes one return pump with two separate pump elements for each brake circuit. For supplying brake pressure in traction control, a precharge pump and a valve unit are provided. In the traction control mode the precharge pump feeds brake fluid from a brake fluid tank into the pump element associated with the brake circuit of the driven wheels while the valve unit disconnects the pump element from the master brake cylinder and connects it to the brake fluid tank via a pressure limiting valve. A check valve prevents brake fluid from flowing into the ABS brake circuit during this process via the pressure limiting valve. The air bubbles created upon expansion of the brake fluid at the pressure limiting valve reach the brake fluid tank along with any excess brake fluid and thus are kept away from the master brake cylinder.

REFERENCES:
patent: 4861118 (1989-08-01), Burckhardt et al.
patent: 4900102 (1990-02-01), Jonner et al.
patent: 4940293 (1990-07-01), Burckhardt et al.

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