Rotational position detection device using a reference mark and

Details Rotational position detection device using a reference mark and Rotational position detection device using a reference mark and

1978-06-06

1980-01-01

Corcoran, Robert J.

Electricity: measuring and testing

Magnetic

Displacement

123117D, G01B 700

Patent

active

041818849

ABSTRACT:
A rotational position detecting apparatus for use in spark ignition control systems for internal combustion engines. A plurality of angular informations are provided circularly on a rotatable disk except at the predetermined reference angular position of said rotatable disk. Two of the angular informations provided beside the reference angular position are spaced twice as wide as a predetermined angular interval between other two of the angular informations. A first and second signal generators spaced integer times as wide as the predetermined angular interval from each other are associated with the rotatable disk for generating respective a.c. output signals in response to the passing of each of said angular informations. The a.c. output signals of the first and second signal generators are applied to an electric circuit which subtracts one of the a.c. output signals from the other of the a.c. output signals and shapes the subtraction resultant signal into a pulse signal.

REFERENCES:
patent: 4024458 (1977-05-01), Templin

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