| 摘要 |
PROBLEM TO BE SOLVED: To provide an optimization method of a fuel injection nozzle for an internal combustion engine having a nozzle body 1 and a needle valve 3 axially movable in a hole 2 of the nozzle body against a closing force, wherein the needle valve 3 is provided with a valve disc sealing surface 4 on an end face thereof nearer to a combustion engine and the valve disc sealing surface 4 moves in cooperation with a valve seat surface 6 of the nozzle body 1 so as to control a transverse area of a flow across at least one injection opening 5 opened to the combustion chamber of the internal combustion engine. SOLUTION: In the optimization method, any number of independent parameters is used for geometrically forming a fuel injection nozzle. A mathematical technique of the particle swarm optimization (PSO) is also used. An optimum reference obtained based on the above is reflected in a structural configuration of the fuel injection nozzle. COPYRIGHT: (C)2008,JPO&INPIT
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