Patent ID: 7712356
Filing Date: 2010-05-11
Classification: B60K,B60L,B60W,G01M,Y02T

Abstract:
1. An internal-combustion-engine misfire determination system for determining an occurrence of a misfire in a multi-cylinder internal combustion engine, of which an output shaft is connected, through a torsion element, to a downstream shaft downstream of the torsion element, the misfire determination system comprising: an output shaft rotational speed detection section that detects an output shaft rotational speed that is the rotational speed of the output shaft; a downstream shaft rotational speed detection section that detects a downstream shaft rotational speed that is the rotational speed of the downstream shaft; a rigidity estimation section that estimates a rigidity of the torsion element based on the output shaft rotational speed and the downstream shaft rotational speed; and a misfire determination section that determines the occurrence of the misfire in the internal combustion engine based on the detected output shaft rotational speed and the estimated rigidity of the torsion element.