| 摘要 |
PROBLEM TO BE SOLVED: To maintain stability as a total of an air-fuel ratio feedback control system at high precision by correcting an amount equivalent to a phase delay of a feedback control amount to an optimum value not by layout. SOLUTION: A difference in capacity of an exhaust pipe classified by a cylinder is reflected in correction of an amount equivalent to a phase delay of a feedback control amount. Concretely, a gain correction value for correction of an amount equivalent to the phase delay is corrected by using a correction factorεclassified by cylinder of a gain correction value, and is adjusted to a value equivalent to an exhaust pipe capacity classified by a cylinder. Thereby, the correction factorεclassified by cylinder of a gain correction value is set to a high value regarding a cylinder being high in exhaust capacity or a low value regarding a cylinder being low in exhaust pipe capacity, based on exhaust pipe capacity.
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