| 摘要 |
PROBLEM TO BE SOLVED: To control an air-fuel ratio by detecting variation among fuel injection valves and by controlling a fuel injection quantity from each fuel injection valve. SOLUTION: An air-fuel ratio control device controls fuel injection quantities from a plurality of fuel injection valves which respectively inject fuel into a plurality of cylinders of an internal combustion engine. The air-fuel ratio control device comprises a fuel injection quantity determination means for determining a fuel injection quantity to be injected into the cylinder at every fuel injection valve so that the air-fuel ratio of the internal combustion engine approaches a target air-fuel ratio, and a fuel injection time determination means for determining fuel injection time for injecting fuel at every fuel injection valve according to the fuel quantity. The air-fuel ratio control device further comprises an actual fuel injection quantity calculation means for calculating an actual fuel injection quantity actually injected during the fuel injection time at every fuel injection valve and a variation judgment means for judging the variation among fuel injection valves based on the actual fuel injection quantity. COPYRIGHT: (C)2007,JPO&INPIT
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