| 摘要 |
PROBLEM TO BE SOLVED: To avoid generation of misfire due to a decrease of an intake air amount, in the case of inhibiting a fuel cut at deceleration time in order to prevent deterioration of a catalyst caused by a high temperature lean atmosphere. SOLUTION: In an operating condition executing a fuel cut, an intake air amount is set to a relatively small amount, without consideration relating to a combustion limit. Consequently, when the fuel cut is inhibited, fuel is injected in a state where an intake air amount per one stroke is lower than the combustion limit, as a result, misfire is generated. Therefore, in order to prevent catalytic deterioration, the fuel cut is inhibited at deceleration time, in the case of executing fuel injection, for instance, an idle speed control valve 36 is controlled, by ensuring an intake air amount of minimum limit necessary for combustion, generation of misfire is surely prevented. |
