| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection control device for an internal combustion engine capablle of suppressing the adherence of fuel to the inner wall surface of a cylinder to suppress the dilution of oil. SOLUTION: The fuel injection control device for an internal combustion engine comprises: a fuel injection valve 10 directly injecting the fuel in a cylinder 2 of the internal combustion engine 1; and a solenoid valve 18 adjusting the pressure of fuel injected from the fuel injection valve 10. The fuel injection control device calculates a fuel injection amount Q injected from the fuel injection valve 10 for each cycle according to the operational state of the internal combustion engine. In the fuel injection control device, when the calculated fuel injection amount Q in which a valve open period of the fuel injection valve 10 reaches a predetermined minimum valve open period Tmin is smaller than a minimum fuel injection amount Qmin, the operation of a solenoid valve 18 is controlled to decrease the pressure of fuel so as to execute split injection at which the fuel of the fuel injection amount is injected from the fuel injection valve 10 in the cylinder 2 a plurality of times, and the operation of the fuel injection valve 10 is controlled so as to execute the split injection at which the valve open period of the fuel injection valve 10 in each time reaches the minimum valve open time Tmin or longer. COPYRIGHT: (C)2009,JPO&INPIT
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