Double-acting two-stage hydraulic control device
AssigneeInternational Engine Intellectual Property Company, LLC
InventorNing Lei
Life of this patent
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Abstract
A hydraulic control device which may be used in a number of applications, including with a fuel injector, includes a control valve having a first and a second independently shiftable valve member, the control member being configurable to define a plurality of actuating fluid flow paths for controlling hydraulic flow therethrough. A fuel injector includes the aforementioned control valve. A method of hydraulic control includes a number of steps, including independently controlling the shifting of two valves in a control valve assembly to selectively control the flow of actuating fluid to an actuator.
Claims21
A method of controlling injection strategy of an injection event of a hydraulically actuated intensified fuel injector, comprising:
- fluidly coupling a source of actuating fluid to a control valve assembly;
- providing a drain for draining spent actuating fluid from the control valve assembly;
- fluidly coupling the control valve assembly to an injector intensifier chamber;
- effecting the desired injection strategy by independently controlling the shifting of two valves in the control valve assembly to selectively control a flow of actuating fluid to the intensifier chamber through at least one parallel flow path to a common terminus and to drain spent actuating fluid from the intensifier chamber.
A method of controlling the fuel injection from a hydraulically actuated intensified fuel injector comprising:
- i. fluidly coupling a control valve assembly to a source of actuating fluid;
- ii. selectively alternatively configuring the control valve assembly with two valves with two valves to;
- 1. a vent disposition to vent the actuating fluid;
- 2. a pilot disposition to convey a first certain volume of working fluid through a first of two parallel flow paths to effect a pilot fuel injection event;
- and
- 3. a main injection disposition to convey a second certain volume through at least the second of the two parallel flow paths of working fluid to effect a main fuel injection event, the two parallel flow paths having a common terminus.
Dependencies are inferred from the claim text.