Variable reluctance sensor interface using a differential input

Details Variable reluctance sensor interface using a differential input Variable reluctance sensor interface using a differential input

1994-02-22

1995-12-19

O'Shea, Sandra L.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

327 4, G01P 348, H03K 508

Patent

active

054771420

ABSTRACT:
In accordance with the teachings of the present invention, an adaptive threshold circuit is provided which develops a series of square-wave voltage pulses from an alternating differential voltage that is produced in response to the rotation of a wheel. The adaptive threshold circuit includes an input circuit for providing an input voltage in response to the alternating differential voltage. A first voltage comparator compares the input voltage with an adaptive analog threshold voltage and produces an output in response thereto which causes a rising edge of the square-wave voltage pulse. A second voltage comparator compares a selected portion of the input voltage with the adaptive analog threshold voltage and produces an output in response thereto. The adaptive threshold circuit further includes a binary counter having a reset input for receiving the first voltage comparator output and an enable input for receiving the second voltage comparator output and provides a plurality of binary outputs. The second voltage comparator output thereby enables the counter so as to detect a peak input voltage. A digital-to-analog converter receives the binary outputs from the binary counter and generates the adaptive analog threshold voltage as a function of a selected percent of peak voltage.

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U.S. patent application Ser. No. 08/168,298, filed Dec. 17, 1993, by Hansen et al. (Pending U.S. appl.).
David K. Long, "An Adaptive Sense Amplifier For Engine Control Applications", Paper No. 770435, Society of Automotive Engineers International Automotive Engineering Congress and Exposition, Cobo Hall, Detroit, Michigan Feb. 28-Mar. 4, 1977.

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