| 摘要 |
When alcohol mixing fuel is supplied to an internal combustion engine, an intake air flow rate is detected and a basic amplitude amount alpha of an upstream target air-fuel ratio abyfr corresponding to this detected intake air flow rate is calculated. Next, alcohol concentration in the fuel (in more detail, ethanol concentration Cetha) and a cooling water temperature (or an intake air temperature) are detected, hydrogen concentration Ch in a mixing exhaust gas is calculated based on the detected ethanol concentration Cetha and the detected cooling water temperature (or the detected intake air temperature) amplitude gain beta corresponding to the calculated hydrogen concentration is calculated and finally, an amplitude amount (alpha×beta) of the upstream target air-fuel ratio is calculated.
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