Fuel injector with dual control valve
AssigneeInternational Engine Intellectual Property Company, LLC
InventorNing Lei
Life of this patent
Estimating the term…
Abstract
A hydraulically actuated, intensified fuel injector includes a controller achieving a desired injection control strategy by selectively independently porting actuating fluid to and venting actuating fluid from an intensifier piston to control the compressive stroke of the intensifier piston and selectively independently porting actuating fluid to and venting actuating fluid from a needle valve to control the opening and closing of the needle valve during the injection event. A method of control is further included.
Claims60
A unit fuel injector, the injector internally preparing fuel during an injection event at a pressure sufficient for injection into an internal combustion engine by means of an intensifier piston, comprising;
- a selectively actuatable controller being in fluid communication with a source of pressurized actuating fluid and being in fluid communication with a substantially ambient actuating fluid reservoir, the controller having a first valve for selectively independently porting actuating fluid to and venting actuating fluid from the intensifier piston and a second valve for selectively independently porting actuating fluid to and venting actuating fluid from a needle valve during the injection event for controlling opening and closing of the needle valve.
A method of injection control for a fuel injector, comprising;
- fluidly coupling a selectively actuatable controller with a source of pressurized actuating fluid and with a substantially ambient actuating fluid reservoir;
- and
- controlling opening and closing of the needle valve by;
- a. selectively independently porting actuating fluid to and venting actuating fluid from an intensifier piston by means of a first valve;
- and
- b. selectively independently porting actuating fluid to and venting actuating fluid from a needle valve during an injection event by means of a second valve.
A hydraulically actuated, intensified fuel injector, comprising:
- a controller achieving a desired injection control strategy by selectively independently porting actuating fluid to and venting actuating fluid from an intensifier piston to control the compressive stroke of the intensifier piston and selectively independently porting actuating fluid to and venting actuating fluid from a needle valve to control the opening and closing of the needle valve during the injection event.
Dependencies are inferred from the claim text.