| 摘要 |
PROBLEM TO BE SOLVED: To provide the air-fuel control device for an internal combustion engine which can improve the emission at the air-fuel ratio shift time. SOLUTION: When an air-fuel ratio learning value reaches upper/lower limits (S202), the air-fuel ratio feedback correction value (S203) at this time is measured for a certain time (S205) and by enlarging (S207, S208) the upper/lower limits of the air-fuel ration learning value by its shift amount (S206), the emission at the air-fuel ration shift time can be improved, in the air-fuel ratio control device of an internal combustion engine.
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