Anti-lock hydraulic braking systems for vehicles
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United States of America Patent
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May 21, 1996
Grant Date -
N/A
app pub date -
Feb 4, 1993
filing date -
Feb 6, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
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).
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