Brake pressure control apparatus for an all wheel drive vehicle

Details Brake pressure control apparatus for an all wheel drive vehicle Brake pressure control apparatus for an all wheel drive vehicle

1992-02-27

1993-02-23

Oberleitner, Robert J.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303DIG4, 3031162, B60T 1314

Patent

active

051884372

ABSTRACT:
When ASR is running, the driver can brake at any time and does not encounter a stiff brake pedal. The ABS is equipped with an aspirating return pump which serves as a pressure producer in the ASR case with the aid of two auxiliary valves, i.e. a changeover valve and a loading valve. The brake pressure on the wheel on a selected axle that first shows a tendency to slip is modulated by way of the auxiliary valves, while the brake pressure on all other wheels is modulated by the ABS valves. In this manner brake pressure can always reach at least one wheel brake. If the ABS responds, the ASR is shut off.

REFERENCES:
patent: 4796959 (1989-01-01), Seibert et al.
patent: 4861116 (1989-08-01), Bernhardt et al.
patent: 4900102 (1990-02-01), Jonner et al.
patent: 4900105 (1990-02-01), Burgdorf et al.
patent: 4971400 (1990-11-01), Jonner

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