| 摘要 |
PURPOSE:To reduce the mechanical noise by adjusting a pulse width of a driving pulse for controlling the operation of a fuel pumping solenoid valve and starting main injection before ending of pilot injection. CONSTITUTION:When an engine is in an operational condition where pilot injection should be executed, a control circuit 5 reads an output signal from a nozzle lift sensor and determines whether or not the output signal has fallen twice in one injection stroke. If NO, stop control of a solenoid valve 20 is increased by a predetermined value, and if YES, the stop control is decreased by a predetermined value. In an actual operation of the solenoid valve 20, a pilot injection time and a main injection time are continuously established under a separate condition. Accordingly, an injection nozzle 10 is seated only once in one injection stroke to thereby reduce a seating noise. Accordingly, a mechanical noise may be reduced as maintaining the effectiveness of the pilot injection.
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