Directional speed sensing systems and methods
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United States of America Patent
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Apr 23, 2013
Grant Date -
Feb 3, 2011
app pub date -
Sep 17, 2009
filing date -
Jul 28, 2009
priority date (Note) -
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Abstract
A directional speed sensor comprises first and second Hall-effect modules. The first Hall-effect module outputs a first current pulse for a first predetermined period when a tooth of a toothed wheel that rotates with a shaft of the vehicle passes the first Hall-effect module in a first rotation direction and outputs the first current pulse for a second predetermined period when the tooth passes the first Hall-effect module in a second rotational direction. The second Hall-effect module is electrically connected in parallel with the first Hall-effect module, is angularly offset from the first Hall-effect module with respect to a center of the shaft, outputs a second current pulse for the first predetermined period when the tooth of the toothed wheel passes the second-Hall-effect module in the first direction, and outputs the second pulse for the second predetermined period when the tooth passes the second Hall-effect module in the second direction.
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