Emergency brake system using a load-responsive apportioning valve
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United States of America Patent
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-
Apr 1, 2003
Grant Date -
N/A
app pub date -
Jan 9, 1998
filing date -
Jun 2, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rear axle braking system for a vehicle has a primary electronic braking circuit supplied with a source of primary braking pressure and a mechanical back-up braking circuit supplied with a source of back-up braking pressure. The braking actuator receives braking pressure and thereby brakes a wheel on a vehicle axle. During braking, a changeover valve is normally actuated to apply the primary braking pressure to the braking actuator. In the event of an electronic system failure, the changeover valve is not applied and instead the source of back-up braking pressure is supplied to the actuator. A regulating valve is located in the back-up braking circuit between the source and the changeover valve and is operable as a function of axle loading and back-up brake pressure to control the supply of back-up braking pressure to the changeover valve. The application of additional braking pressure to a wheel can be limited if the loading on the axle is likely to result in vehicle instability when braking.
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