Fuel injector with controlled high pressure fuel passage
AssigneeInternational Engine Intellectual Property Company, LLC
InventorNing Lei
Life of this patent
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Abstract
A unit fuel injector, the injector internally preparing fuel during an injection event at a pressure sufficient for injection by means of an intensifier driven by a pressurized non-fuel actuating fluid selectively ported to the intensifier, includes a selectively actuatable controller interposed in a fuel passage, the fuel passage effecting fluid communication between an intensifier fuel chamber and a needle valve, the controller being shiftable between an open and a closed disposition for selectively opening and closing the fuel passage during the injection event A control apparatus and a method of injection timing control are further included.
Claims55
A unit fuel injector, the injector internally preparing fuel during an injection event at a pressure sufficient for injection by means of an intensifier driven by a pressurized non-fuel actuating fluid selectively ported to the intensifier, comprising;
- a selectively actuatable controller interposed in a fuel passage, the fuel passage effecting fluid communication between an intensifier fuel chamber and a needle valve, the controller being shiftable between an open and a closed disposition for selectively opening and closing the fuel passage during the injection event.
A control apparatus for a unit fuel injector, the injector internally preparing fuel during an injection event at a pressure sufficient for injection by means of an intensifier driven by a pressurized non-fuel actuating fluid selectively ported to the intensifier, comprising;
- a selectively actuatable injection timing controller interposed in a fuel passage, the fuel passage effecting fluid communication between an intensifier fuel chamber and a needle valve, the controller being shiftable between an open and a closed disposition for selectively opening and closing the fuel passage during the injection event.
A method of injection timing control for a unit fuel injector, the injector internally preparing fuel during an injection event at a pressure sufficient for injection by means of an intensifier driven by a pressurized non-fuel actuating fluid selectively ported to the intensifier, comprising;
- interposing a selectively actuatable injection timing controller in a fuel passage, the fuel passage effecting fluid communication between an intensifier fuel chamber and a needle valve;
- and
- shifting the controller being between an open and a closed disposition for selectively opening and closing the fuel passage during the injection event.
A timing control mechanism for use with a fuel injector having an intensifier plunger and an intensifier chamber fluidly coupled to a needle valve chamber by a high pressure fuel passage, comprising:
- a timing control valve in fluid communication with the high pressure fuel passage and being shiftable between a blocked disposition in which fuel flow in the high pressure fuel passage is substantially blocked and an unblocked disposition in which fuel flow in the high pressure fuel passage is substantially unrestricted.
A fuel injector comprising:
- an intensifier plunger and an intensifier chamber fluidly coupled to a needle valve chamber by a high pressure fuel passage, comprising:
- a timing control valve in fluid communication with the high pressure fuel passage and being shiftable between a blocked disposition in which fuel flow in the high pressure fuel passage is substantially blocked and an unblocked disposition in which fuel flow in the high pressure fuel passage is substantially unrestricted.
The fuel injector of claim 56 being hydraulically actuated and electronically controlled.
Dependencies are inferred from the claim text.