Patent ID: 7865293

Claim:
A fuel injection control device for a fuel supply system that injects fuel to an inside of a cylinder as a part of a target engine for performing fuel combustion, to an intake passage of the engine or to an exhaust passage of the engine with a predetermined injector, the fuel injection control device comprising: a fuel pressure sensing means for sequentially sensing fuel pressure fluctuating with the injection of the injector; a diagram detecting means for detecting a diagram as a profile indicating a transition of an injection rate at a present time based on a transition of the fuel pressure sequentially sensed by the fuel pressure sensing means, the injection rate being equivalent to a fuel quantity injected from the injector per unit time; and an injection varying means for varying an injection command to the injector or an injection condition of the injector by comparing the diagram that is the profile indicating the transition of the injection rate and that is detected by the diagram detecting means and a predetermined basic diagram such that the diagram as the actual profile indicating the transition of the injection rate becomes the same kind as the basic diagram and such that an area of the detected diagram approximates to an area of the basic diagram, wherein the basic diagram is one of a triangle, a trapezoid and a rectangle or a diagram made by combining multiple pieces of at least one kind of the triangle, the trapezoid and the rectangle.