Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1995-06-07
1996-06-25
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031152, B60T 840
Patent
active
055293883
ABSTRACT:
The present invention relates to an antilock brake system having an electrically controlled hydrostatic motor and pump system. The inventive ABS improves stability and maneuverability during braking by reducing or eliminating vibration and noise problems due to conventional on/off solenoid valve control. In accordance with exemplary embodiments, a two position solenoid is actuated (i.e., energized) in response to initiation of an ABS control mode. Once activated, the solenoid remains energized for the duration of the ABS control mode. Because the solenoid remains continuously activated during the ABS control mode, the vibration and noise associated with repeatedly activating and deactivating a solenoid is reduced or eliminated. To effect pressure increases and decreases in a braking channel during the ABS control mode, a reversible (i.e., bi-directional) pump is provided in each braking channel. To further enhance the smoothness of the braking, the reversible pump is controlled with an analog command signal that is, for example, proportional to a difference between wheel deceleration/acceleration detected for the channel and a vehicle's deceleration/acceleration.
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Imra America Inc.
Oberleitner Robert J.
Poon Peter M.
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