| 摘要 |
PURPOSE:To smoothly shift torque characteristics as combustion is changed by providing a mixed combustion zone at a switching point between stratified combustion and uniform combustion in an engine where fuel injection for stratified combustion is controlled at the time of low and intermediate loading, and fuel injection for uniform combustion is controlled at the time of high loading. CONSTITUTION:Three sections are provided, they are a fuel injection timing determination section 54 which inputs both engine revolution Ne by an engine revolution computing section 51, and the quantity of fuel injection Gf by a fuel injection pulse duration computing section 53, an ignition timing determination section 55 and a combustion mode judging section 56. In the combustion mode judging section 56, a switching point between stratified combustion and uniform combustion is set in advance by the map of Ne - Gf, and a mixed combustion zone of both of them is set at a switching point Po where a torque curve TL for stratified combustion at low speed and intermediate loading and a torque curve TH for uniform combustion at high loading are over- lapped. In mixed combustion, fuel is injected 2 times, that is, at the early and later stages of compression stroke, and furthermore, the quantity of fuel injection by an injector 10 is controlled to be great at the early stage as loading is increased, and is also controlled to be less at the later stage.
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