| 摘要 |
PROBLEM TO BE SOLVED: To make the amount of combustion fuel appropriate immediately after alcohol concentration of fuel is changed, and to maintain an air fuel ratio at a desired value. SOLUTION: This fuel injection control device for an internal combustion engine in which alcohol and gasoline can be used independently or by mixture as fuel is provided with a vapor pressure detecting means (Step S20) for detecting vapor pressure (evap) of fuel and vapor pressure correcting means (Steps S40, S90, S130, S140) for correcting fuel injection amount based on the detected vapor pressure (evap). In particular, out of the total amount of injected fuel, the amount of fuel adhering to a port wall face etc. and carried over in subsequent cycles relates to vapor pressure of the fuel. Therefore, due to this vapor pressure correction, the amount of combustion fuel immediately after alcohol concentration of fuel is changed can be made appropriate. COPYRIGHT: (C)2006,JPO&NCIPI
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