Patent ID: 8051838

Claim:
A fuel injection control device that is applied to a fuel supply system having a pump section driven by an internal combustion engine for pumping fuel in a fuel tank, an accumulator for storing the fuel pumped by the pump section and an injector for performing injection supply of the fuel in the accumulator directly into a cylinder of the internal combustion engine and that controls fuel injection quantity of the injector, the fuel injection control device comprising: an injection period setting means for setting an injection period of the fuel of the injector based on the fuel injection quantity of each time and pressure of the fuel in the accumulator; an overlap determining means for determining whether the fuel injection period set by the injection period setting means overlaps with a fuel inflow period, in which the high-pressure fuel flows into the accumulator with the fuel pumping by the pump section; and an injection period changing means for changing the fuel injection period set by the injection period setting means to an advance side or a delay side to eliminate or reduce the overlap when the overlap determination means determines that the fuel injection period overlaps with the fuel inflow period.