Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1989-12-26
1991-05-14
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
180197, 303 10, 303 92, 303110, 303116, 303119, 303DIG3, B60T 834, B60T 848, B60T 844
Patent
active
050150430
ABSTRACT:
A drive-slip braking control device (ASR) for a road vehicle equipped with an anti-lock system (ABS) and having a hydraulic dual-circuit brake system, in which, on the brake circuit (II) of the driven vehicle wheels, the ABS works on the return-flow principle and the ASR on the principle of decelerating a vehicle wheel tending to spin by subjecting its wheel brake to pressure from an auxiliary-pressure source. A return pump of the ABS (assigned to the brake circuit of the driven vehicle wheels) is utilized as an auxiliary-pressure source for the drive-slip control mode. The brake unit can be shut off from the main brake line of the brake circuit of the driven vehicle wheels by an ASR control valve. The brake fluid supply flow path leading from the brake-fluid reservoir of the brake system to the inlet side of the return pump of the brake circuit of the driven wheel is one of the compensating flow paths of the brake unit. An inflow control valve is connected between the inlet side of the return pump and the delivery outlet of the brake unit for feeding brake fluid to the return pump in the ASR mode. The inflow control valve can be changed over from its shutoff position assigned to the braking mode into a throughflow position assigned to the drive-slip control mode. A leak detector mechanism is also included.
REFERENCES:
patent: 4804236 (1989-02-01), Burgdorf et al.
patent: 4861118 (1989-08-01), Burckhardt et al.
patent: 4940293 (1990-07-01), Burckhardt et al.
Butler Douglas C.
Daimler-Benz AG
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