Circuit and method for conditioning a wheel speed sensor signal

Details Circuit and method for conditioning a wheel speed sensor signal Circuit and method for conditioning a wheel speed sensor signal

1995-06-21

1998-04-07

Snow, Walter E.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324173, 32420712, G01P 348, G01P 354, G01B 700, G01R 33025

Patent

active

057368520

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.

REFERENCES:
patent: 3769534 (1973-10-01), Wroblewski et al.
patent: 3793545 (1974-02-01), Leiber et al.
patent: 3939373 (1976-02-01), Roberts
patent: 4293814 (1981-10-01), Boyer
patent: 4761609 (1988-08-01), Dorman et al.
patent: 4894613 (1990-01-01), Tsugawa
patent: 4953670 (1990-09-01), Chemelewski

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