Device and method of detecting rotation angle

Details Device and method of detecting rotation angle Device and method of detecting rotation angle

2006-05-09

2006-05-09

Bennett, G. Bradley (Department: 2859)

Geometrical instruments

Miscellaneous

Light direction

C033S600000

Reexamination Certificate

active

07040025

ABSTRACT:
A rotation-angle detecting device contains two rotators having the same number of teeth, which engage with a gear fixed to a rotation-detecting axle as a detected object. The detecting device further includes a controller. Receiving a rotation-angle signal from the rotators, the controller amplifies the signal, performs calculations, and stores the results. The controller converts each rotation-angle signal from each rotator into each periodic waveform output having the same crest value, and stores an initial phase difference value at initial setting. In driving operations, monitoring an evaluation value calculated with reference to the initial phase difference value, the controller determines that abnormalities occurred, if the evaluation value exceeds a predetermined abnormality-evaluation threshold.

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