Braking system for a vehicle with drive-slip control (ASR) and a

Details Braking system for a vehicle with drive-slip control (ASR) and a Braking system for a vehicle with drive-slip control (ASR) and a

1989-12-26

1991-10-08

Graham, Matthew C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303 93, 303113, 303116, B60T 834

Patent

active

050548611

ABSTRACT:
In a drive-slip control device on a road vehicle equipped with an anti-lock system and having a hydraulic dual-circuit brake system, in which at least on the brake circuit 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. For the drive-slip control mode, a return pump of the ABS (assigned to the brake circuit of the driven vehicle wheels) is utilized as an auxiliary-pressure source. By means of an ASR control valve, the affected brake unit can be shut off from the main brake line of the brake circuit of the driven vehicle wheels. The return pump is connected to the return line of the brake circuit of the driven vehicle wheels. By means of an accumulator isolating valve the return line can be shut off from a buffer accumulator provided for receiving brake fluid bled from the wheel brake and from the inlet of the return pump during normal braking. In a braking operation subjected to the anti-lock control the return line can be connected to the buffer accumulator. An isolating valve is connected to that portion of the low-pressure supply path of the return pump extending from the outlet non-return valve during braking and wherein the low-pressure supply path of the return pump is shut off from the wheel brake during a pressure build-up phase of the drive-slip control.

REFERENCES:
patent: 4861118 (1989-08-01), Burckhardt et al.
patent: 4904029 (1990-02-01), Leiber

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