Circuit and method for conditioning a wheel speed sensor signal
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United States of America Patent
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Apr 7, 1998
Grant Date -
N/A
app pub date -
Jun 21, 1995
filing date -
Jun 21, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In accordance with the teachings of the present invention, a wheel speed sensor signal conditioning circuit is provided for conditioning sensor output signals received from a variable reluctance wheel speed sensor. The conditioning circuit includes filtering circuitry and peak detecting circuitry that detects the positive and negative voltage peaks of a sensor output signal irrespective of the sensor output signal crossing a reference voltage level. When the sensor output signal exceeds a predetermined peak to peak voltage level, the peak detecting circuitry limits the amplitude of the output signal and forms a dynamic high pass filter. A comparator circuit is coupled to the peak detecting circuitry and outputs a first signal when the peak detecting circuitry detects a positive voltage peak and outputs a second signal when the peak detecting circuitry detects a negative voltage peak of the sensor output signal.
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