| 摘要 |
PROBLEM TO BE SOLVED: To stably burn fuel in a combustion chamber when an internal combustion engine is operated at a rich air fuel ratio. SOLUTION: A fuel injection valve is arranged to directly inject fuel into the combustion chamber. An exhaust gas recirculating passage and an overlap period changing means for changing period of overlap during which an exhaust valve opening period Ex and a following intake valve opening period IN overlap are provided. When it is requested to discharge exhaust gas of rich air fuel ratio from the combustion chamber, air fuel ratio of exhaust gas is made rich by making average air fuel ratio of air fuel mixture in the combustion chamber rich with executing auxiliary fuel injection Qv before fuel injection Qm for driving, and exhaust gas is recirculated to the combustion chamber via the exhaust gas recirculating passage and an intake air passage by extending the overlap period. COPYRIGHT: (C)2004,JPO
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