Patent ID: 7111614

Claim:
A fuel injector comprising: an injector body with a fuel supply passage, a fuel drain passage, a nozzle passage, an admission control chamber and a needle control chamber; a control valve attached to said injector body and including a control valve member operably coupled to an electrical actuator, and being movable between a first position and a second position; an admission valve member positioned in said injector body and being movable between a first position in which said fuel supply passage is open to said nozzle passage, and a second position in which said fuel supply passage is closed to said nozzle passage, and including a control surface exposed to fluid pressure in said admission control chamber; a needle valve including a member with a closing hydraulic surface exposed to fluid pressure in said needle control chamber, and an opening hydraulic surface exposed to fluid pressure in said nozzle passage; and a pressure control passage extending between said control valve and said needle control chamber.