Fuel Injectors with Intensified Fuel Storage and Methods of Operating an Engine Therewith
AssigneeSturman Digital Systems, LLC
InventorOded Eddie Sturman
Life of this patent
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Abstract
Fuel injectors with intensified fuel storage and methods of operating an engine therewith. At least one storage cavity is provided in the intensifier type fuel injector, with a check valve between the intensifier and the needle chamber and storage cavity preventing loss of injection pressure while the intensifier plunger cylinder is refilling with fuel. This provides very efficient injector operation, particularly at low engine loads, by eliminating the wasted energy of compressing, venting and recompressing fuel for injection. Various injector designs and methods of operating the same in an engine are disclosed.
Claims17
An intensifier type fuel injector comprising:
- a needle chamber;
- a needle in the needle chamber having a first position blocking fuel injection and a second position allowing fuel injection;
- an intensifier having an intensifier piston and at least one intensifier plunger for intensifying a fuel pressure responsive to an intensifier actuation fluid pressure;
- first valving coupled to control intensifier actuation fluid over the intensifier piston;
- second valving responsive to a needle actuation fluid to controllably;
- maintain the needle in the first position against an intensified fuel pressure in the needle chamber, or
- allow the needle to move toward the second position responsive to intensified fuel pressure in the needle chamber;
- at least one intensified fuel storage chamber coupled through a port to the needle chamber;
- and,
- a check valve coupled to allow fuel flow from the intensifier plunger to the needle chamber and the at least one storage chamber, and to block fuel flow in the opposite direction.
Dependencies are inferred from the claim text.