Anti-lock hydraulic braking systems for vehicles

Details Anti-lock hydraulic braking systems for vehicles Anti-lock hydraulic braking systems for vehicles

1993-02-04

1996-05-21

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

3031161, B60T 1368

Patent

active

055183069

ABSTRACT:
An anti-lock (ABS) hydraulic braking system for vehicles comprises a first normally open solenoid-controlled valve (4) disposed in a line between a master cylinder (3) and a brake (1), a second normally closed solenoid-controlled valve (8) disposed between the brake and expander chamber (7), and a normally-open solenoid-controlled by-pass valve (5) located between the master cylinder and the brake and by-passing the first solenoid-controlled valve (4). The by-pass valve (5) is movable between a normally open position to provide unrestricted communication between the master cylinder and the brake, and a closed position in response to an anti-lock signal accompanied by closure of the first solenoid-controlled valve (4) and opening of the second solenoid-controlled valve (8), the by-pass valve remaining closed in a given brake application cycle with the brake being re-applied at a rate determined by flow through the first solenoid-controlled valve (4) following closure of the second solenoid-controlled valve (8).

REFERENCES:
patent: 5096269 (1990-07-01), Pickenhahn

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