Vehicle hydraulic braking systems of the brake-by-wire type
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United States of America Patent
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-
Jun 13, 2000
Grant Date -
N/A
app pub date -
Oct 16, 1998
filing date -
Apr 17, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A vehicle hydraulic braking system of the brake-by-wire type is disclosed in which proportional solenoid-operated valves (12, 13) are adapted to control the pressure in wheel brake actuators of the brakes (8, 9) on a single axle of a vehicle, and a balance valve (20) is provided to enable individual hydraulic brake circuits to be hydraulically connected so that the pressure applied to each brake is guaranteed to be substantially the same, a first one (13) of the proportional valves (12, 13) is adapted to be isolated so that the hydraulic circuit is fed by a second, single, proportional valve (12). Applying both brakes under the control of a single proportional valve ensures that any fluid leakages are balanced since substantially equal brake-applying pressures are generated. An alternative vehicle hydraulic braking system of the brake-by-wire type is also disclosed in which a control module (3) is provided which is adapted to select between at least a first control mode (104) in which more than one of the proportional valves (12, 13) is adapted to be controlled in parallel and a second control mode (103) in which only one of the proportional valves (12, 13) is operated to control the pressure in the wheel brake actuators.
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