Adaptive loading circuit for a differential input magnetic wheel speed sensor
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United States of America Patent
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-
Sep 12, 1995
Grant Date -
N/A
app pub date -
Feb 22, 1994
filing date -
Feb 22, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An adaptive loading circuit is provided for adaptively attenuating an alternating differential voltage that is produced by a magnetic sensor in response to the rotation of a wheel while maintaining noise immunity. The circuit includes an input for receiving an input differential voltage from the magnetic sensor via first and second input lines. A resistive divider network is included which has a resistive load serially connected to each of the first and second input lines and a plurality of adaptively selectable parallel resistive loads connected between the first and second input lines. Combinations of the parallel resistive loads are adaptively selected when the input differential voltage exceeds predetermined voltage thresholds so as to divide the input differential voltage into a selected portion thereof as an output differential voltage. In addition, the parallel resistive loads may be selectively switched out when the input differential voltage drops below a low voltage threshold. The output differential voltage is then processed so as to achieve rotational speed information about the wheel.
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