| 摘要 |
PURPOSE:To certainly prevent the secondary injection by installing a piston which controls the end of injection and can be closed alternately in each cycle into the upper part of a fuel valve and controlling said piston according to the operation state, in a plurality of fuel valves installed onto one cylinder. CONSTITUTION:In a fuel pump body 01, a plunger 03 is raised and lowered by the revolution of a cam synchronized with the crankshaft of an engine, and fuel is pressurized and supplied into the fuel valve body 101 through an injection pipe 201. In said fuel injection pipe body 101, a needle valve 107 is opened when the fuel pressure acting onto the pressure receiving part of the needle valve 107 exceeds the valve closing pressure by a spring 111, and fuel is jetted-out from an injection hole 108. In this case, a piston 115 fitted into a piston guide 114 is installed at the top edge of a piston pushing rod 116 formed integrally with the needle valve 107, and pressurized oil is introduced onto the edge surface through a hydraulic pipe 301 and two solenoid valves 303 and 304, etc., and said solenoid valves 303 and 304 are opening/closing- controlled by a microcomputer.
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