| 摘要 |
PROBLEM TO BE SOLVED: To provide an air-fuel ratio control device for internal combustion engine capable of sensing the air-fuel ratio for each cylinder accurately and controlling without increasing the cost. SOLUTION: The mean LAFSAV of the air-fuel ratio is calculated on the basis of the LAFS output of a linear A/F sensor 22, followed by calculation of the deviation LAFSD of the momentary value of the LAFS output from the mean LAFSAV, and the deviational cumulated mean LAFSDA in the cumulative ranges R1, R3, R4, R2 set as the exhausting period of each cylinder is determined to serve for determining the deviation of the air-fuel ratio of each cylinder from the mean air-fuel ratio value of all cylinders, and the maximum deviation cylinder air-fuel ratio correction factor kcyl is updated for the cylinder whose deviational cumulated mean LAFSDA is maximum and the fuel injection amount is corrected.
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