Anti-lock brake system with piezoelectric brake actuator
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United States of America Patent
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Apr 10, 2001
Grant Date -
N/A
app pub date -
Mar 19, 1999
filing date -
Apr 15, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An anti-lock braking system includes a moveable member to be braked and a friction brake for applying a braking force. A controller actuates the friction brake in accordance with braking force demands. Braking force demands are determined by the controller by electrical input signals received from a signal generator that is mechanically linked to the brake pedal, as well as by signals from a slip sensor. The slip sensor records values from wheel speed sensor and computes values that may indicate a slippage condition. Based on the recorded and computed values, the slip sensor and sends electric signals to the controller. The friction brake includes a prestressed piezoelectric element that is lightweight, less cumbersome, and highly controllable as compared with prior anti-lock braking devices, and is actuated via electrical signals rather than a mechanical system. A modification is disclosed in which an anti-lock system is placed on each wheel with independent slip sensors providing signals to controllers that control application of braking forces over each wheel as necessary.
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