Signal conditioning circuit for magnetic sensing means

Details Signal conditioning circuit for magnetic sensing means Signal conditioning circuit for magnetic sensing means

1979-02-09

1981-03-24

Krawczewicz, Stanley T.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

Ignition timing

324 57N, 324173, 324208, 73119A, F02P 1700

Patent

active

042583241

ABSTRACT:
A signal conditioning circuit for the output of a magnetic position sensor is disclosed. The magnetic sensor generates a total output signal that increases as a function of the rotational velocity of the sensor with a spurious noise component that is a relatively constant percentage of the actual signal voltage over the speed range. In a preferred embodiment, the signal conditioning circuit discriminates between the noise component and the signal component by comparing the total signal to a variable threshold only after a positive going zero cross. The variable threshold is generated as a function of the peak amplitude of the total signal. In a second embodiment the signal conditioning circuit includes gain control means which varies the amplitude of the total output signal as a function of its peak to maintain the threshold above the noise component.

REFERENCES:
patent: 2973430 (1961-02-01), Pelino
patent: 3065412 (1962-11-01), Rosenthal
patent: 3289073 (1966-11-01), Loeffler
patent: 3801830 (1974-04-01), Boyer

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