| 摘要 |
PROBLEM TO BE SOLVED: To accurately calculate cylinder filling air quantity while considering intake air cooling effect by evaporation latent heat of injected fuel, in a cylinder injection engine. SOLUTION: This control device calculates base intake air quantity according to engine rotation speed and intake air pressure or the like, and temperature correction coefficient according to intake air temperature and cooling water temperature. Moreover, intake air cooling effect correction coefficient is calculated according to fuel injection start timing in intake stroke. Since a cylinder injection engine has characteristics that cooling effect of intake air by evaporation latent heat of injected fuel gets larger and cylinder filling air quantity increases as fuel injection timing in intake stroke is retarded, establishment is done to make intake air cooling effect collection coefficient gets larger as fuel injection start timing in intake stroke is retarded. Cylinder filling air quantity corrected according to intake air cooling effect by evaporation latent heat of injected fuel by multiplying the base intake air quantity by the temperature correction coefficient and the intake air cooling effect correction coefficient. COPYRIGHT: (C)2007,JPO&INPIT
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