| 摘要 |
PROBLEM TO BE SOLVED: To enable a device to control air-fuel ratio in each cylinder, under an air-fuel ratio sensor in a quantity smaller than that of cylinders. SOLUTION: A fuel injection pulse width Ti' is inputted to fuel injection valves INJ#1504 to INJ#n506, and fuel is supplied to an engine 507. This time air-fuel ratio is detected by an A/F sensor 508, to obtain a control amountαin an A/F feedback control means 510, and a fuel injection pulse width T is multiplied by this amountαto obtain a fuel injection pulse width Ti, so as to form an air-fuel ratio feedback loop. A cylinder classified correction amount calculating means 509, cylinder classified correction amount memory means 511 in addition, cylinder classified correction amounts 502, 503, are provided and in all the rest of n-1 number of fuel injection valves except the first fuel injection valve, a fuel injection pulse width supplied to these fuel injection valves is respectively corrected by a cylinder classified correction coefficient. These correction coefficients are calculated in a cylinder classified correction amount calculating means 509, to be stored in the cylinder classified correction amount memory means 511 as a learning value.
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