System to sense a marker on a rotating body

Details System to sense a marker on a rotating body System to sense a marker on a rotating body

1976-07-06

1977-08-02

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

F02P 1700

Patent

active

040399311

ABSTRACT:
To accurately determine the position of a marker on a rotating disk, for example coupled to the crankshaft of an automotive engine to determine the angular position thereof, an inductive transducer picks up the field generated by a permanent magnet located on the disk and, to compensate for amplitude variations in the output due to speed changes of the disk, and eliminate the effects of spurious side lobes generated by reversely positioned magnets, the amplitude of the output signal is normalized in an amplifier which includes a non-linear input circuit. The non-linear input circuit, preferably, is a diode-resistor network, in which the diode is forwardly poled, and a controlled current is supplied to the diode, the control being effected by the output of the amplifier in a feedback circuit, so that the output obtained from the amplifier will be uniform regardless of change in speed of the rotating body, and hence change in amplitude of the voltage induced in the inductive pick-up.

REFERENCES:
patent: 2785215 (1957-03-01), Yetter
patent: 3030813 (1962-04-01), Crawford et al.
patent: 3292092 (1966-12-01), Germann
patent: 3650149 (1972-03-01), Howes
patent: 3727124 (1973-04-01), Kahen

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