Method and apparatus for detecting misfire of engine

摘要

A method and an apparatus for detecting engine misfire has advantages of precisely detecting misfire occurrence when misfire continuously occurs at three or more engine cylinders and detecting an engine cylinder where the misfire occurs. The method may include calculating an angular acceleration factor value on the basis of an engine speed, calculating a variation value of an angular acceleration factor on the basis of the angular acceleration factor value, calculating a threshold point of misfire starting and a threshold point of misfire ending, comparing the variation value of the angular acceleration factor with the threshold point of misfire starting, comparing the variation value of the angular acceleration factor with the threshold point of misfire ending, and detecting a cylinder of the engine where the misfire occurs by the comparison results.

主权项

1. A method of detecting misfire of an engine for a vehicle, comprising:
calculating an angular acceleration factor value on the basis of an engine speed; calculating a variation value of an angular acceleration factor on the basis of the angular acceleration factor value; calculating a threshold point of misfire starting and a threshold point of misfire ending; comparing the variation value of the angular acceleration factor with the threshold point of misfire starting; comparing the variation value of the angular acceleration factor with the threshold point of misfire ending; and detecting a cylinder of the engine where the misfire occurs by the comparison results of the variation value of the angular acceleration factor with the threshold point of misfire starting and the threshold point of misfire ending.