摘要:
PROBLEM TO BE SOLVED: To provide a fuel injection device for an internal combustion engine and a method of controlling fuel injection by a simple structure at low cost. SOLUTION: This fuel injection device for the internal combustion engine comprises an injection nozzle 5 and an electric injector 1 having a needle 7 opening and closing the nozzle 5 by an electric actuator 8. The movement of the needle 7 is controlled by a rod 14 pressed by the pressure of a fuel in a control chamber 15 in which the needle 7 is normally maintained at the position for closing the nozzle 5. The control chamber has an inlet 18 with a diameter D 4 and an outlet passage 24 having a diameter D 5 and controlled by a control valve 16. The method for fuel injection comprises the step of selecting the ratio D 5 /D 4 of the diameters to determine the rate of the displacement of the needle 7 and the step of transmitting a first electric command C 1 and a second electric command C 2 adjacent to each other to the device 8 to move the needle 7 in the profile P operated continuously with time. COPYRIGHT: (C)2007,JPO&INPIT