| 摘要 |
PURPOSE:To improve startability especially at the time of high-temperature by changing over a positive pressure port of a fuel pressure control valve for controlling a pressure regulator in a fuel passage to be connected to a pressure source using exhaust pressure of an engine or a fuel tank. CONSTITUTION:A pressure regulator 7 is interposed in a fuel passage 6 of a fuel injection valve 2 provided on a branch portion 4 of an intake manifold 3, and a pressure chamber 9 of the pressure regulator is communicated with an intake manifold 3 by a passage 10 through a fuel pressure control valve 11. In this case, the fuel pressure control valve 11 has a positive pressure port 11a connected and communicated with an upper chamber of a surge tank 15 by a branch passage 12, which is connected to an exhaust pipe 14 and kept at a constant pressure by a pressure regulating valve 16. A passage 12b connected to a fuel tank 13 branches off from the branch passage 12, and a selector valve 21 switched by operation of a detection switch 20 for discriminating engine starting, idling and running operation from one another is provided in the branch portion. |
