| 摘要 |
PROBLEM TO BE SOLVED: To control fuel spray shape by controlling flow of air near a nozzle tip of a fuel injection valve when fuel is injected into a cylinder. SOLUTION: The fuel injection valve 1 is provided with a hollow fuel injection nozzle man body 3, a roughly cylindrical outer needle valve (first needle valve) 4 arranged inside of the fuel injection nozzle main body 3, an inner needle valve (second needle valve) 2 arranged inside of the outer needle valve 4 and concentrically built in the outer needle valve 4, an outer needle valve solenoid 6 capable of moving the outer needle valve 4 in an axial direction of the fuel injection valve 1, and an inner needle valve solenoid 7 capable of moving the inner needle valve 2 in an axial direction of the fuel injection valve 1. Negative pressure in an air chamber 12 is retained by opening and closing the inner needle valve 2 in compression stroke and fuel spray is deformed by opening the inner needle valve 2 at fuel injection timing under a stratified combustion operation condition. COPYRIGHT: (C)2007,JPO&INPIT
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