초록 ▼

An injector for a common rail fuel injection system employs a solenoid operated valve configuration which functions to control the amount of filling by regulating the start of filling and the end of filling between the injection events. In some embodiments, a three-way solenoid valve is employed. Th

An injector for a common rail fuel injection system employs a solenoid operated valve configuration which functions to control the amount of filling by regulating the start of filling and the end of filling between the injection events. In some embodiments, a three-way solenoid valve is employed. The start of injection is controlled by a control piston. An intensifier piston is employed to increase the injection pressure. A pilot piston assembly may also be employed to regulate the shape of the injection.

대표청구항 ▼

[ What is claimed is:] [1.] A fuel injector for a common rail injection system comprising:an injector body having axially spaced inlet and injection portions, said injection portion defining an injection orifice, a nozzle chamber and an interior valve seat, said inlet portion comprising a rail inlet

[ What is claimed is:] [1.] A fuel injector for a common rail injection system comprising:an injector body having axially spaced inlet and injection portions, said injection portion defining an injection orifice, a nozzle chamber and an interior valve seat, said inlet portion comprising a rail inlet for receiving pressurized fuel supplied to said injector;an injector valve mounted in said body and engageable with said seat to prevent fuel communication through said injection orifice and during an injection event axially displaceable from said seat for injecting pressurized fuel through said orifice;a control unit comprising a control chamber and a control piston axially displaceable in said control chamber;a pump unit comprising a pump chamber and a pump piston axially displaceable in said pump chamber;a nozzle conduit connecting said pump chamber and said nozzle chamber;a control valve assembly comprising a control valve to provide selective fuel communication between said rail inlet and said control and pump chambers for controlling the supply of pressurized fuel in said pump chamber and said control chamber, said pump piston being displaced for the injection of pressurized fuel by opening said control valve to vent pressure from said control chamber,so that fuel is controllably supplied to said pump chamber between injection events and the fuel in said control chamber is selectively controlled to start an injection whereby said injector valve is displaced by pressurized fuel in said nozzle chamber to inject pressurized fuel through said injection orifice.