Patent ID: 8855888
Filing Date: 2014-10-07
Classification: F02D,G01M

Abstract:
1. An engine misfire identification device for identifying an engine misfire for a multiple-cylinder internal combustion engine in which an output shaft is connected to a rear portion via a torsion element, said engine misfire identification device comprising: a rotation position detection unit that is configured to detect a rotation position of the output shaft of said internal combustion engine, a unit rotation-angle rotation speed computation unit that is configured to compute a unit rotation-angle rotation speed, which is a rotation speed for each prescribed unit rotation angle of the output shaft of said internal combustion engine, based on said detected rotation position, and an engine misfire identification unit that is configured to make an identification as to whether or not any one of cylinders of the internal combustion engine undergoes an engine misfire by using a first technique for said computed unit rotation-angle rotation speed, when a drive point of said internal combustion engine does not belong to a resonance region of a rear portion including said torsion element, and is configured to make an identification as to whether or not any one of cylinders of the internal combustion engine undergoes an engine misfire by using a second technique, which is different from said first technique, for said computed unit rotation-angle rotation speed, when the drive point of said internal combustion engine belongs to said resonance region, wherein