| 摘要 |
PROBLEM TO BE SOLVED: To suppress increase in fuel pressure in the inside of a fuel pipe under a condition that an engine is stopped, by arranging in a fuel supply pass leading to a fuel injection valve, pressure lowering means by which fuel pressure in the fuel supply pass when fuel supply is stopped is reduced to less than injection set pressure that the fuel injection valve is opened. SOLUTION: During an engine is operated, a solenoid valve 10 is opened at a predetermined timing according to a required injection quantity so as to supply fuel L to a fuel pipe 15, and in association with this, a fuel injection valve 20 is opened at injection set pressure so as to eject fuel L. Next, when the engine becomes in a stopping condition, the solenoid valve 10 becomes in its closing condition so as to shut off a pass 7 and the fuel pipe 15, therefore the inside of the fuel pipe 15 is made to be in a tightly closed condition. At this time, when the pipe inner pressure of the fuel pipe 15 is increased and exceeds the valve opening pressure of a one directional valve 35, the one directional valve 35 placed in a branch pass 25 is opened so that the pipe inner pressure of the fuel pipe 15 is suppressed to less than the valve opening pressure of the one directional valve 35. Therefore, pipe inner pressure may not exceed the injection set pressure of the fuel injection valve 20, and fuel L is prevented from being led to flow out from the fuel injection valve 20. |
