| 摘要 |
PURPOSE:To make it possible to carry out fuel injection with the use of a conventional mechanical fuel injection system consisting of a fuel cam and an fuel injection pump in the case of the difficulty is encountered in carrying out fuel injection with the use of an electronic fuel injection system. CONSTITUTION:In a fuel injection device in which fuel injection pressure for a Diesel engine is obtained by a fuel pressure accumulated at a constant pressure in a high pressure accumulator 20, the operating part is separated into two sections, an automatic fuel injection part 38 for injecting fuel into a combuston chamber of the engine and a fuel injection control part 27 for controlling fuel injection. Further, the fuel injection control part 27 estabilishes fuel injection in such a way that a first needle 31 opens a fuel passage 37 due to the switchover of control hydraulic oil passages in one directional control valve 20 and a second needle 35 closes a fuel passage 36 branched off from the fuel passage 37 and communicated with a fuel tank 17. The fuel injection is completed by closing the first needle 31 and by opening the second needle 35. |
