| 摘要 |
PROBLEM TO BE SOLVED: To provide a misfire detecting device of an internal combustion engine which can accurately determine the misfire of each cylinder by relatively easy computing, and which has high general versatility. SOLUTION: A deviation between a standard rotation speed OMGR ((k-1)NTDC) and a rotation speed parameter (OMGR(i)) is calculated as a relative rotation speed OMGREF(i) (S12, S13). The standard rotation speed OMGR is detected near a compression top dead center of each cylinder, and the rotation speed parameter (OMGR(i)) is detected on a predetermined crank angle. Then an inertial force rotation speed OMGI(k) is calculated which indicates the speed component caused by the inertial force of the reciprocating motion part or the like of the internal combustion engine (S14). The relative rotation speed OMGREF(i) is modified by this, and the modified relative rotation speed OMGREFM(i) is calculated (S15). By the summation of the modified relative rotation speed OMGREFM(i), a determination parameter MFJUD(k) is calculated (S16), and misfire determination is made based on the judgement parameter MFJUD (S17). COPYRIGHT: (C)2007,JPO&INPIT
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