| 摘要 |
PROBLEM TO BE SOLVED: To secure combustion stability by increasing/reducing a second fuel injection amount depending on an ignition timing even during retard combustion. SOLUTION: In this cylinder direct injection type spark ignition internal combustion engine, fuel injection is performed twice in one combustion cycle during retard combustion, and the second fuel injection is performed toward a cavity in the crown face of a piston at a timing a predetermined period ahead of an ignition timing for igniting stratified mixture formed around an ignition plug 14 in a combustion chamber 3 so that fuel injected with the second fuel injection reaches the ignition plug at the ignition timing. During the retard combustion, the injection rate of the second fuel injection to the first fuel injection is changed depending on a fuel injection timing for the second fuel injection and the ignition timing. This increases/reduces the second fuel injection amount depending on the retard of the ignition timing to further retard the ignition timing while securing the combustion stability, thus actualizing the temperature rise of exhaust gas and a reduction of HC with after-burn. COPYRIGHT: (C)2010,JPO&INPIT
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