| 摘要 |
During start-up of an in-cylinder fuel injection spark ignition engine ( 1 ), an engine controller ( 21 ) calculates a start-up fuel injection pulse width TIST on the basis of a cooling water temperature Tw, an engine rotation speed Ne, and a fuel supply pressure Pf to a fuel injector ( 8 ) (S 1 ). When the fuel supply pressure Pf exceeds a required fuel pressure, the engine controller ( 21 ) executes stratified combustion by means of compression stroke fuel injection. By setting the required fuel pressure precisely in accordance with a start-up condition defined by the start-up fuel injection pulse width TIST and the engine rotation speed Ne, the opportunities for stratified combustion during start-up increase, and the amount of hydrocarbon discharge decreases.
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