To materialize temperature rise of exhaust gas and reduction of HC emission quantity by compatibly establishing great delay of ignition timing and stability of combustion.
Normal stratified combustion operation and homogeneous combustion operation are performed under a warming up completion condition. An operation mode is set to a top dead center injection operation mode for promotion of activation of a catalytic converter under a cold engine condition. In here, injection start timing ITS is before compression top dead center, and injection end timing ITE is after top dead center, and fuel injection is performed over compression top dead center. Ignition timing ADV is in timing after compression top dead center which is later than the injection start timing ITS. Since large flow collapses and field gets stable at compression top dead center and minute turbulence due to energy of spray itself is created, stability of combustion is improved. Consequently, ignition timing can be greatly delayed. Fuel pressure is controlled to higher as engine speed gets higher, turbulence due to spray energy is activated more as it goes to high speed zone and combustion is quickened.
ISHII HITOSHI
NAKAJIMA AKIRA
Hiromichi Kobayashi
Tomioka Kiyoshi
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