Patent ID: 9416760
Filing Date: 2016-08-16
CPC Classification: F02D,F02M,Y02T

Claim Text:
1. A fuel injector comprising: an injector body defining a fuel inlet, a drain outlet and a nozzle outlet, and having disposed therein a nozzle chamber, a needle control chamber and a valve chamber, and the injector body including a first stack component with a flat seat and a second stack component with a conical seat, the first stack component defines an F orifice, an A orifice, and a Z orifice; the needle control chamber being fluidly connected to the drain outlet through a drain passage that includes the conical seat; the needle control chamber being directly fluidly connected to the nozzle chamber through the Z orifice; the needle control chamber being fluidly connected to the valve chamber through the A orifice; the nozzle chamber being fluidly connected to the valve chamber by a pressure passage that includes the F orifice and opens through the flat seat; a needle control valve that includes a control valve member trapped to move between contact with the conical seat and contact with the flat seat, a spring positioned to bias the control valve member toward the conical seat; an electrical actuator operably coupled to the needle control valve, and having an energized configuration at which the control valve member is pushed away from the conical seat toward the flat seat, and a de-energized configuration; and a direct control needle valve disposed in the injector body and having an opening hydraulic surface positioned in the nozzle chamber and a closing hydraulic surface positioned in the needle control chamber, and being movable between a closed position and an open position at which the nozzle outlet is fluidly connected to the nozzle chamber.