| 摘要 |
PROBLEM TO BE SOLVED: To further surely and accurately determine a continuous misfire of two cylinders in an internal combustion engine with a plurality of cylinders capable of outputting motive power to a driving shaft via a torsional element. SOLUTION: Whether or not to be the continuous misfire of the two cylinders is determined (S110 to S130), by calculating a determining difference J360 as a 360-degree difference of a duration difference D39, by calculating the duration difference D39 as a difference before 90 degrees and before 30 degrees more than the top dead center of a compression stroke in a 30-degree duration T30 required for rotating a crankshaft by 30 degrees. When determining as the continuous misfire of the two cylinders, a misfire cylinder is specified (S140 to S190), by subtracting a second phaseθ2, by adding a first phaseθ1 determined on the basis of an engine speed Ne of an engine and a gear stage of a transmission to a crank angle CA of a reference position of a post-filter rotating speed FN30 provided by applying a band-pass filter to a 30-degree rotating speed FN30 being a rotating speed with every 30 degrees of the crankshaft. COPYRIGHT: (C)2008,JPO&INPIT
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