MISFIRE DETECTION METHOD OF INTERNAL COMBUSTION ENGINE AND MISFIRE DETECTION DEVICE OF INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To surely detect a misfire during traveling.SOLUTION: In an electronic control unit 20, when a vehicle is in a prescribed traveling state, and not in gear stage setting at which misfire detection is prohibited (S102, S104), a rotation variation signal is detected on the basis of the rotation number of an engine 1 (S106), the setting of a gear stage and a comparison of magnitudes of misfire determination thresholds (S108) which are defined according to the engine rotation number or the like are performed (S110), and when it is determined that a level of the rotation variation signal is lower than the misfire determination threshold, the generation of a misfire is determined (S112), and the display or the like of an alarm lamp is performed (S116).