Patent ID: 7543483
Filing Date: 2009-06-09
Classification: F02D,G01M

Abstract:
1. An engine misfire detection apparatus for detecting a misfire of a multi-cylinder internal combustion engine in a hybrid system where the internal combustion engine is equipped with an emission control device for emission control in an exhaust system, the engine misfire detection apparatus comprising: a rotational position detector that detects a rotational position of an output shaft of the internal combustion engine; a unit angle rotation time computation module that computes a unit angle rotation time, as a time required for rotation of every preset unit rotational angle of the output shaft of the internal combustion engine, from the detected rotational position; and an engine misfire identification module that, when the internal combustion engine is under warm-up acceleration control for accelerating warm-up of the emission control device, divides multiple engine misfire patterns into at least two preset groups based on the computed unit angle rotation time and identifies a current engine misfire among the multiple engine misfire patterns, when the internal combustion engine is not under the warm-up acceleration control, the engine misfire identification module dividing the multiple engine misfire patterns into plural groups different from the preset groups based on the computed unit angle rotation time and identifying the current engine misfire among the multiple engine misfire patterns.