| 摘要 |
<P>PROBLEM TO BE SOLVED: To appropriately and accurately determine a misfire in an internal combustion engine. Ž<P>SOLUTION: A rotational fluctuation Nxd is given as a variation in rotation speed N of a crankshaft at every 120° crank angle CA, corresponding to an ignition timing in each cylinder of a six-cylinder engine. A difference between the rotation fluctuation Nxd and a previous rotational fluctuation Nxd at a crank angle of 360° before the specific crank angle is calculated as a rotational fluctuation difference Nxdflux, and the specific rotational fluctuation Nxd at the specific crank angle and the previous rotational fluctuation Nxd at the crank angle of 360° before the specific crank angle are summed up to give a total rotational fluctuation Nxdint (S100-S140). There are performed a single misfire determination process which is a single misfire determination logic determining a single misfire pattern by using the calculated rotational fluctuation Nxd, the rotational fluctuation difference Nxdflx and the total rotational fluctuation Nxdint, a consecutive misfire determination process which is a consecutive misfire determination logic determining a consecutive misfire pattern, and an intermittent misfire determination process which is an intermittent misfire determination logic determining an intermittent misfire pattern (S150-S170), thereby determining the engine misfire. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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