| 摘要 |
<P>PROBLEM TO BE SOLVED: To appropriately and accurately determine a misfire of 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 degrees 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 degrees 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 degrees 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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