Patent ID: 7055494

Claim:
A fuel injection system of an engine, comprising: a fuel supply pump for pressure-feeding fuel; a common rail that accumulates the fuel pressure-fed from the pump at a high pressure; a plurality of injectors mounted to cylinders of the engine, the injectors of the respective cylinders being connected to the common rail and injecting the accumulated fuel, if an actuator is energized; injection controlling means for outputting a normal injection command signal for performing a normal injection, which is performed to obtain engine torque; and injector driving means for performing energization of the actuator responsive to the command signal outputted by the injection controlling means, wherein the injection controlling means outputs a post-injection command signal for performing a post-injection for supplying unburned gas into exhaust gas of the engine after the normal injection when the injection controlling means performs post-injection operation, the injection controlling means intermittently implements a post-injection suspending pattern for suspending the output of the post-injection command signal in a period for performing the post-injection operation, after outputting the normal injection command signal, and the injection controlling means implements the post-injection suspending pattern in a period during which a pressure-feeding period of the fuel supply pump for pressure-feeding the fuel and an injection period of the normal injection do not overlap.