| 摘要 |
Intake pressures PMi ÄmmHgÜ are detected at each crank angle position of 30 DEG Ä DEG CA (Crank Angle)Ü after an internal combustion engine 1 is started, and the intake pressures PMi are smoothed according to transition conditions thereof so as to be obtained as an atmospheric pressure. As this occurs, the plurality of intake pressures PMi are smoothed provided that a difference DELTA PM between the maximum PMMAX and minimum PMMIN of the plurality of intake pressures PMi is small enough to fall within a predetermined value. As an atmospheric pressure, when intake pressures PMi are stable, can be obtained by the plurality of samplings at the crank angle positions, the reliability of an atmospheric pressure detector for an internal combustion engine can be increased. <IMAGE>
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