Patent ID: 9545920
Date: 2017-01-17
CPC Classifications: B60K,B60W,F02B,F02D,G01M,G07C,Y02T,Y10S

Claim:
1. A misfire determination device for an internal combustion engine of a hybrid automobile, the internal combustion engine including a plurality of cylinders that output a motive power for running, the hybrid automobile including an electric motor mechanically connected to an output shaft of the internal combustion engine, the misfire determination device comprising at least one electronic control unit programmed to a) calculate a rotational fluctuation of the internal combustion engine in the unit of a time length, b) calculate a rotational fluctuation of the electric motor in the unit of a time length, and c) determine that a misfire may be occurring in at least one of the cylinders of the internal combustion engine when (i) the rotational fluctuation of the internal combustion engine has exceeded a first threshold and (ii) the rotational fluctuation of the electric motor that is calculated at a time preceding a time when the rotational fluctuation of the internal combustion engine that has exceeded the first threshold is calculated by a predetermined crank angle is smaller than a second threshold.