| 摘要 |
A stroke judgment device includes a gear having a portion with no teeth, a pulse generator, an intake pipe internal pressure detecting device and an ECU. The ECU controls an injector(s) and the ignition timing of a spark plug(s). The ECU mainly includes a phase detecting device for detecting the phase of the crankshaft, a first stroke judging device for judging stroke based on detected phase and intake pipe internal pressure, a rotational cycle detection device for detecting rotational cycle of the crankshaft, a comparison device for comparing two rotation cycles of specified phase, a second stroke judging device for judging stroke based on results of comparison, and selection device for selecting one of the first stroke judging device or the second stroke judging device.
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