| 摘要 |
In a device for carrying out stroke determination, with intake pressure as a parameter, to provide a stroke determination unit for a 4-cyclce engine capable of accurate stroke determination, Combined intake pressure Pb of intake ports of first to third cylinders is detected, and stroke determination is carried out by recognizing within a combined intake pressure waveform based on a detection value for the combined intake. pressure Pb, shapes of the combined intake pressure waveform for a specified phase period of a cranks shaft as "rising" or "upward peak" Pb patterns. The Pb pattern recognition is carried out by storing variation patterns of intake pressure values measured within the specified crankshaft phase period, and collating with a data map stored within an ECU. Also, the pattern recognition is carried out by collating with condition equations representing "rising" or "upward peak". With the latter, intake pressure variation due to contamination such as noise to the Pb sensor is made negligible, and noise toughness of the stroke determination unit is improved.
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