| 摘要 |
PROBLEM TO BE SOLVED: To eliminate deviation of intake air quantity due to influence of dispersion between individuals of internal combustion engines and blow back caused by intake air pulsation, or the like. SOLUTION: When a deviation between demanded intake air quantity and intake air quantity GA detected by a hot-wire type air flow meter 21 is generated by receiving influence of dispersion between individuals of internal combustion engines 1 and blow back due to intake air pulsation, or the like, and air fuel ratio F/B (feedback) control is performed based on voltage VOX1 from an oxygen sensor 25 of exhaust gas from the internal combustion engine 1, a Max (upper limit) guard value of intake air quantity GA is reduced if air fuel ratio deviation quantity based on air fuel ratio F/B correction quantity become larger than a predetermined value and the deviation is in a rich side, and the Max guard value of intake air quantity GA is increased if the deviation is in a lean side, Consequently, generation of deviation of intake air quantity GA is eliminated and accuracy of air fuel ratio control is improved. COPYRIGHT: (C)2006,JPO&NCIPI
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