| 摘要 |
PROBLEM TO BE SOLVED: To suppress deterioration of controllability of an A/F (air-fuel ratio) even though an inert gas occupied amount is increased by introduction of external EGR gas into an intake passage, in fuel injection amount control for controlling a fuel injection amount by taking into consideration a wall surface adhesion quantity of fuel injected from a fuel injection valve to the intake passage. SOLUTION: When the inert gas occupied amount is increased by introduction of external EGR gas and gas concentration in an evaporation section is changed, by taking into consideration that a fuel evaporation speed is changed, the fuel injection amount is corrected (steps ST6-ST8) by reflecting the EGR gas concentration when calculating at least one (an adhesion rate) of the adhesion rate (the adhesion rate of fuel to a wall surface) and a residual rate (the residual rate of liquid film fuel stuck on the wall surface) which are used for calculating the fuel injection amount. By thusly reflecting the EGR gas concentration in correction of the fuel injection amount, an influence of evaporation characteristic caused by a change in gas concentration by introduction of EGR gas is reduced, and the A/F is controlled with high accuracy. COPYRIGHT: (C)2007,JPO&INPIT
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