| 摘要 |
PROBLEM TO BE SOLVED: To make the injection pressure of fuel by an injector high in a fuel injection device without adding an inexpensive device or a member. SOLUTION: An ECU of the fuel injection device performs a temporary valve closing operation for displacing a needle in the opening direction of an injection hole after displacing it temporarily in the closing direction in one injection stroke from when the needle opens the injection hole from a fully closed state until the needle closes the injection hole. Pressure waves generated accompanying opening of the injection hole can be used by the temporary valve closing operation mainly comprising operation of an existing needle. Thereby, in the fuel injection device, the injection pressure of fuel by the injector can be made high without adding an expensive device or a member by only alternating a control flow. COPYRIGHT: (C)2008,JPO&INPIT
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