Patent ID: 6059204
Filing Date: 2000-05-09
Classification: F02D,F02M

Abstract:
An accumulator fuel injection system for a multi-cylinder internal combustion engine including solenoid-controlled fuel injection valves, each having a casing including a spring loaded nozzle needle with a reduced diameter seat end for closing said injection valve, a control piston movably disposed in said casing in spatially separated relationship from said nozzle needle and having a valve structure integrally formed at one end thereof with a throttle pin axially extending from said one end of said control piston, a fuel inlet cavity formed in said housing at said one end of said control piston so as to receive said throttle pin, a fuel inlet passage leading to said inlet cavity for supplying fuel under pressure to said inlet cavity, a fuel supply passage extending through said valve structure to an annular space surrounding the seat end of said nozzle needle for supplying fuel under pressure to the annular space when said control piston is unseated to open said fuel inlet passage for admitting fuel under pressure to said fuel supply passage to lift said nozzle needle and discharge fuel from said fuel injection valve, said control piston having, at said control piston end opposite said valve structure, a control space in communication with said high pressure fuel supply passage and including a throttle to limit high pressure fuel supply to said control space, a relief passage with a solenoid controlled valve for releasing fuel from said control space for lifting said control piston to open said fuel inlet passage, said throttle pin having a portion extending into said fuel inlet cavity for limiting fuel passage through said valve structure during initial lifting of said control piston, but permitting unrestricted flow of fuel after a predetermined lift movement of said control piston.