| 摘要 |
A fuel injection system for an engine includes an improved construction and provides a method for releasing a needle valve which has adhered to a valve seat in a fuel injector. The fuel injector is a normally closed type and the valve is activated by a solenoid to part from the valve seat to inject fuel. A first power supply unit is provided to supply electric power to the solenoid under an ordinary operating condition of the engine. A second power supply unit is additionally provided to supply electric power greater than the power supplied by the first power supply unit. In one embodiment, the second power supply unit includes a booster to raise the voltage. A switchover mechanism, such as detachable couplers, are provided to switch over between the first power supply unit and the second power supply unit. In one embodiment of the method, the operator detaches the coupler of the first power supply unit from the coupler of the solenoid and joins the coupler of the solenoid to the coupler of the second power supply. Then the operator operates the second power supply unit to supply the greater power to the solenoid to break the adhesion.
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