Honda Motor Co., Ltd.

Bumpei Nakayama

Jun Iida

Naoyuki Tanaka

Hayato Watanabe

Satoshi Kozuka

Nobukazu Asano

A misfire determination device, for an internal combustion engine, according to the present invention detects a combustion state parameter of the internal combustion engine, retrieves an extreme value of the combustion state parameter in an extreme value retrieval section from a start timing of a combustion stroke to a predetermined crank angle (step 5), upon retrieval of the extreme value, sets a predetermined crank angle section subsequent to a crank angle corresponding to the extreme value as a misfire determination parameter calculation section (step 6, expression 5), calculates a misfire determination parameter based on the combustion state parameter that has been detected in the misfire determination parameter calculation section (step 6), and determines a misfire based on the misfire determination parameter (steps 7 to 9).

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Tokyo, Japan

Bumpei Nakayama