| 摘要 |
<P>PROBLEM TO BE SOLVED: To more appropriately and more accurately determine misfire of an internal combustion engine. <P>SOLUTION: Rotational fluctuation Nxd which is given as a variation in rotation speed N of a crankshaft at each crank angle of 120° CA corresponding to ignition timing in each cylinder of a six-cylinder engine, a rotational fluctuation difference Nxdflx which is given as difference to a rotational fluctuation Nxd at a crank angle of 360° CA before the rotational fluctuation Nxd, and a total rotational fluctuation Nxdint which is given as a sum of the rotational fluctuation Nxd and the previous rotational fluctuation Nxd at the crank angle of 360° CA before the rotational fluctuation Nxd are calculated (S100-S140). 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 are executed (S150-S170) to determine the misfire of the engine. <P>COPYRIGHT: (C)2010,JPO&INPIT |
