| 摘要 |
PROBLEM TO BE SOLVED: To substantialize early activation of a catalyst and HC reduction due to after-burning by drastic delay of ignition timing, and to improve combustion stability. SOLUTION: At cold start of an internal combustion engine requiring early temperature rise of a catalytic convertor, ignition timing is set to be after a compression top dead center, and super retard combustion for injecting fuel before the ignition timing and after the compression top center is performed. Since turbulence inside a cylinder is improved due to high-pressure fuel injection immediately before the ignition timing and flame spread is promoted, stable combustion can be realized. The internal combustion engine is equipped with a compression ratio variable mechanism which controls the compression ratio high at the time of super retard combustion. By the high compression ratio, penetration of injection is made short, injection becomes compact, and combustion stability is further improved. COPYRIGHT: (C)2007,JPO&INPIT
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