To raise the exhaust gas temperature and to reduce an HC discharge quantity in a cold engine, by making a large ignition timing delay of the ignition timing compatible with combustion stability.
Ordinary stratified combustion operation and homogeneous combustion operation are performed in a warming-up completed state. For promoting activation of a catalytic converter and reducing the HC discharge quantity in a cold state, fuel injection is performed by straddling a top dead center so that the injection starting timing ITS becomes before a compression top dead center and the injection finish timing ITE becomes after the top dead center as a top dead center injection operation mode. The ignition timing ADV becomes after the top dead center. A swirl and a tumble are damped and very small turbulence is activated in the compression top dead center, and since a positional change in a piston is little, stable combustion can be realized. In the initial stage of starting, fuel pressure is insufficient, and since smoke and HC are deteriorated, a part of fuel is injected as early injection I2 in an intake stroke before main injection I1 straddling the top dead center as (b).
COPYRIGHT: (C)2006,JPO&NCIPI
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