초록 ▼

A fuel injector assembly for an internal combustion engine including an injector body in fluid communication with a source of fuel and a nozzle assembly through which fuel is dispersed from the fuel injector assembly during an injection event. A high pressure fuel delivery system provides high press

A fuel injector assembly for an internal combustion engine including an injector body in fluid communication with a source of fuel and a nozzle assembly through which fuel is dispersed from the fuel injector assembly during an injection event. A high pressure fuel delivery system provides high pressure fuel to the nozzle assembly. The injector body defines a low pressure fuel spill gallery in which unused fuel is collected from the high pressure fuel delivery system. The high pressure fuel delivery system includes a cylindrical bore, a plunger supported for reciprocation within the cylindrical bore, a pump chamber defined by the plunger and the cylindrical bore, and a high pressure fuel passage extending through the injector body from the pump chamber to the nozzle assembly for dispersing fuel at high pressure from the injector assembly. A solenoid operated check valve is located between the pump chamber and the nozzle assembly and between the low pressure fuel spill gallery and the high pressure fuel passage. The check valve is operable to control the pressure in the fuel delivery system by alternatingly reducing the pressure in the fuel system or increasing the pressure in the fuel delivery system by opening and closing same.

대표청구항 ▼

[I claim:] [1.]an injector body in fluid communication with a source of fuel;a nozzle assembly through which fuel is dispersed from said fuel injector assembly during an injection event;a high pressure fuel delivery system providing high pressure fuel to said nozzle assembly;said injector body defin

[I claim:] [1.]an injector body in fluid communication with a source of fuel;a nozzle assembly through which fuel is dispersed from said fuel injector assembly during an injection event;a high pressure fuel delivery system providing high pressure fuel to said nozzle assembly;said injector body defining a low pressure fuel spill gallery in which unused fuel is collected from said high pressure fuel delivery system;said high pressure fuel delivery system including a cylindrical bore, a plunger supported for reciprocation within said cylindrical bore, a pump chamber defined by said plunger and said cylindrical bore, and a high pressure fuel passage extending through said injector body from said pump chamber to said nozzle assembly for dispersing fuel at high pressure from said injector assembly;a solenoid operated check valve disposed between said pump chamber and said nozzle assembly and between said low pressure fuel spill gallery and said high pressure fuel passage, said check valve being operable to control the pressure in said fuel delivery system by being movable between an open position wherein fluid communication is established between said high pressure fuel passage and said low pressure spill gallery thereby reducing the pressure in said fuel delivery system, to a closed position interrupting fluid communication between said high pressure fuel passage and said low pressure spill gallery thereby increasing the pressure in said fuel delivery system and facilitating the delivery of fuel at high pressure from said pump chamber to said nozzle assembly.