Patent ID: 6946830
Filing Date: 2005-09-20
Classification: F02D

Abstract:
1. A rotation-angular-position detecting apparatus for detecting an angular position of a rotation of a first rotor provided with a plurality of first detection members at equal intervals in a rotational direction of said first rotor for each of said intervals, said apparatus comprising: a first pickup provided at a position in close proximity to a rotational locus of said plurality of first detection members provided on said first rotor and used for generating a first detection signal when sensing the proximity of any one of said first detection members; a second rotor rotating in a rotation interlocked with said first rotor at a predetermined speed ratio with respect to said first rotor and having a plurality of second detection members provided at unequal intervals in a rotational direction of said second rotor; a second pickup provided at a position in close proximity to a rotational locus of said plurality of second detection members provided on said second rotor and used for generating a second detection signal when sensing the proximity of any one of said second detection members; a detection means for detecting the generation of said second detection signal for each generation of said first detection signal; and a rotation-angular-position determining means whereby a plurality of specific rotation angular positions of said first rotor are each determined in accordance with a plurality of results of detection of generation of said second detection signal output by said detection means so far including a result of detection of generation of said second detection signal output by said detection means this time, and the number of times said first detection signal is generated after any one of said specific rotation angular positions has been determined is counted to determine a rotation angular position of said first rotor other than said specific rotation angular positions.