| 摘要 |
PURPOSE: To certainly avoid improper fuel injection by making a pump working room in negative pressure by connecting a venturi pump to work as an injection pump to the discharge side of a discharge pump and connecting its suction side to the pump working room. CONSTITUTION: A fuel injection nozzle raises pressure of fuel supplied by a discharge pump 20 to the inside of a pump working room 17 by reciprocating motion of a plunger 12 and supplies it to an injection nozzle 14. Fuel injection timing is controlled by controlling connection between a conduit part 22 and a passage 25 for filling the working room 17 by a control valve 24. In this case, a connecting passage 33 and a return conduit 31 controlled by the plunger 12 only at a bottom dead point UT of the plunger 12 are connected to each other through a venturi pump 28 working as an injection pump. Thereafter, the upstream side of this pump 28 is connected to a conduit 21 through a conduit 26, the downstream side to the return conduit 31 and the suction side to the pump working room 17 through the connecting passage 33. |
