Fuel injector
AssigneeDelphi International Operations Luxembourg S.A.R.L.
InventorNathan Peter Keeler
Life of this patent
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Abstract
The present invention relates to a fuel injector for use in a fuel system of an internal combustion engine. The fuel injector has a supply passage for high pressure fuel and an injection nozzle. The injection nozzle includes a valve needle which can engage with a valve needle seating to control fuel delivery from the fuel injector. A first control valve is provided for controlling fuel pressure within a control chamber to control the valve needle. The fuel injector also includes a second control valve for controlling fuel pressure within a low pressure drain. The invention also relates to a control valve for controlling fuel pressure within a low pressure drain.
Claims11
A fuel injector for use in a fuel system for an internal combustion engine, the fuel injector comprising:
- a supply passage for high pressure fuel,
- an injection nozzle including a valve needle which is engageable with a valve needle seating to control fuel delivery from the injector,
- a first control valve for controlling fuel pressure within a control chamber to control the valve needle, and
- a second control valve for controlling fuel pressure within a low pressure drain, the second control valve being a one-way valve;
- wherein the first control valve selectively permits fuel flow from the control chamber through the second control valve and also selectively prevents fuel flow from the control chamber through the second control valve.
Dependencies are inferred from the claim text.