| 摘要 |
An engine control apparatus receives a rotation signal composed of a train of pulses at every interval of a predetermined angle and having a reference position intermediate of the pulse train. A microcomputer in the apparatus executes a detection of the reference position by an interrupt at every effective edge of the rotation signal. Moreover, the microcomputer detects the crankshaft angle position on the basis of the detection result at the beginning of the start of the engine, and on the basis of the reference position signal after the engine start when it is determined that a signal processing circuit is normally operating, by making the reference position signal from the signal processing circuit effective.
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