Honda Motor Co., Ltd.

Nobukazu Asano

Jun Iida

Hayato Watanabe

Satoshi Kozuka

Naoyuki Tanaka

Bumpei Nakayama

A control apparatus, for an internal combustion engine, detects a rotational speed parameter (time parameter) that represents a rotational speed of the internal combustion engine including a plurality of cylinders, detects a single misfire that is a misfire for every ignition for each of the plurality of cylinders, based on the rotational speed parameter that has been detected in each combustion stroke of the plurality of cylinders (stepstoand), counts, as a misfire counter value, the number of times that the single misfire has been detected for each of the plurality of cylinders (stepsand), determines whether the misfire is occurring in the cylinder, based on the misfire counter value (stepsto), and corrects an ignition timing of the cylinder that has been determined that the misfire is occurring to an advance angle side (steps, and).

Control apparatus for internal combustion engine

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

Nobukazu Asano