| 摘要 |
<P>PROBLEM TO BE SOLVED: To stably burn fuel in a combustion chamber if an average air-fuel ratio of mixture is rich when required load is small. <P>SOLUTION: Low temperature combustion and normal combustion can be selectively performed, and main injection Qm for injecting fuel for mainly driving an internal combustion engine, and auxiliary injection Qv for injecting fuel for promoting combustion of the fuel mainly injected by the main injection can be performed. When it is required to make an air-fuel ratio of exhaust gas emitted from the combustion chamber rich when a required load is smaller than a prescribed value, first combustion is performed at a lean air-fuel ratio at an injection pattern for performing only the main injection at faster timing than a normal injection timing. Then, auxiliary injection is performed at faster injection timing than the timing of the main injection, and first combustion is performed at a rich air-fuel combustion at an injection pattern for performing the main injection at faster timing than a normal injection timing. <P>COPYRIGHT: (C)2004,JPO |
