Hydraulic dual-circuit brake system

Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal

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Details

303 93, B60T 840

Patent

active

050610171

ABSTRACT:
An 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 electromagnetic 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 hydraulic unit is provided, which portions of connect the fluid tank to the return pump and switch the alternating connection of the outlet of the return pump to the master brake cylinder or to the brake fluid tank. For a rapid reduction of brake pressure in the wheel brake cylinders of the driven wheels at the onset of braking during traction control operation, the switch portion has at least one 3/3-way magnetic valve with a pressure limiting valve disposed in a valve bypass. This 3/3-way magnetic valve connects the outlet of the pumping element associated to one driven wheel to the master cylinder in a first position, and in a third position it connects it directly to the brake fluid tank. In a second position, all the working connections are blocked, so that a brake supply pressure can be built up.

REFERENCES:
patent: 4509802 (1985-04-01), Solleder et al.
patent: 4726630 (1988-02-01), Krohn et al.
patent: 4793662 (1988-12-01), Arikawa
patent: 4865397 (1989-09-01), Inoue et al.
patent: 4900102 (1990-02-01), Jonner et al.

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