| 摘要 |
An apparatus for controlling operation of a four-cycle internal combustion engine including an odd number of cylinders comprises a reference position signal generator 1A driven by the crank shaft whose output includes a number of constant-interval pulses generated periodically at a predetermined constant time interval during a single rotation of the crank shaft, such number being equal to N times the number of cylinders, a cylinder identification signal generator 2A driven by the cam shaft interlocked to and at half the speed of the crank shaft, whose output includes a number of different-interval pulses corresponding to the number of cylinders, a synthesized reference position signal generator 33 for generating a signal T2 by dividing the frequency of the reference position signal by 1/2N, a cylinder discriminator 34, 31A for generating a cylinder discrimination signal F, and a timing control unit 32. The synthesized reference position signal is generated with high accuracy because the reference position signal is generated by a detector mounted directly on the crank shaft and thus protected against errors due to driving power transmission.
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