US 2015/0144710 A1 · FUEL INJECTOR

Abstract

The present invention relates to a fuel injector for use in delivering fuel to an internal combustion engine. The fuel injector includes a nozzle having a valve needle which is movable with respect to a valve needle seat. The valve needle travels through a range of movement between a closed position and an open position to control fuel delivery through at least one nozzle outlet. The valve needle cooperates with a needle sleeve or a control member which is located in a piston guide. The valve needle is movable relative to the needle sleeve or the control member. The needle sleeve or the control member is movable relative to the piston guide. The invention also relates to a method of operating a fuel injector; and a fuel injector control unit.

Claims16

Dependent claims

A fuel injector for use in delivering fuel to an internal combustion engine, the fuel injector comprising:

a nozzle having a valve needle which is movable with respect to a valve needle seat through a range of movement between a closed position and an open position to control fuel delivery through at least one nozzle outlet;
the valve needle cooperating with a needle sleeve which is located in a piston guide;
the valve needle is movable relative to the needle sleeve;
and the needle sleeve is movable relative to the piston guide;
wherein the fuel injector comprises a first control chamber for controlling the position of the valve needle relative to the needle sleeve;
and a second control chamber for controlling the position of the needle sleeve relative to the piston guide;
a first nozzle control valve being provided for controlling the pressure in the first control chamber;
and a second nozzle control valve being provided for controlling the pressure in the second control chamber.

5 more elements

Dependencies are inferred from the claim text.

Fuel injector

Life of this patent

Fuel injector

Life of this patent

Abstract

Claims16