| 摘要 |
PROBLEM TO BE SOLVED: To achieve the rise in an exhaust gas temperature and the reduction of an HC exhaust gas amount at the time of a cold engine, making the substantial retardation of an angle of the ignition timing and combustion stability be compatible. SOLUTION: In the warm-up completion state exceeding 80°C in a cooling water temperature, a normal stratified charged combustion operation and a homogenized combustion operation are carried out. In the cold state not higher than 80°C, fuel is injected ranging over a top dead center so that an injection start timing ITS becomes before compression top dead center and an injection completion timing ITE becomes after the top dead center as a top dead center operation mode in order to promote the activation of a catalyst converter and reduce the exhaust amount. The ignition timing ADV becomes after the top dead center. At the compression top dead center, swirl and tumble are damped, a very small turbulence is activated, and a piston changes little in position, then stable combustion can be realized. When the fuel property is distinguished, and heavy gasoline is used, the ignition timing and fuel injection starting timing are corrected in an advanced angle to prevent the fuel stability from deterioration. COPYRIGHT: (C)2006,JPO&NCIPI |
