Hydraulic dual-circuit brake system with dual pressure sensors a

Details Hydraulic dual-circuit brake system with dual pressure sensors a Hydraulic dual-circuit brake system with dual pressure sensors a

1992-09-18

1993-06-08

Graham, Matthew C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303 11, 303DIG2, 303DIG4, 3031162, B60T 832, B60K 2816

Patent

active

052172848

ABSTRACT:
A hydraulic dual-circuit brake system with front/rear brake circuit distribution, an anti-skid system (ABS) and traction control (ASR) for motor vehicles including a four-channel hydraulic unit with control valves and with one return pump and a separate pump element for each brake circuit. An apparatus to supply brake pressure to the rear axle brake circuit in traction control has a reversing valve, which in traction control disconnects the rear-axle brake circuit from the master brake cylinder, and a pump feed apparatus, which upon activation feeds brake fluid into the pump element of the rear axle brake circuit. For ideal brake force distribution between the front and rear axles, an electric control system upon brake pedal actuation, switches the reversing valve over to its closing position, turns on the return pump, and activates the pump feed apparatus, at least until such time as the brake pressure generated in the rear axle brake circuit by the pump element is equivalent to a set-point value predetermined as a function of the brake pressure in the front axle brake circuit.

REFERENCES:
patent: 3836206 (1974-09-01), Leiber
patent: 4807944 (1989-02-01), Weise
patent: 4824183 (1989-04-01), Uchida et al.
patent: 4846532 (1989-07-01), Friedow et al.
patent: 4900105 (1990-02-01), Burgdorf et al.
patent: 4950028 (1990-08-01), Harrison
patent: 5033800 (1991-07-01), Willmann

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