Fuel injector actuator assemblies and associated methods of use and manufacture

• US 20110048381A1
• Filed: 07/21/2010
• Published: 03/03/2011
• Est. Priority Date: 01/07/2008
• Status: Active Grant

• Current Assignee: Advanced Green Innovations, LLC
• Original Assignee: McAlister Technologies, LLC
• Inventors: McAlister, Roy E.
• Granted Patent: US 8,074,625 B2
• Time in Patent Office: Days
• US Class Current: 123/472
• CPC Class Codes: F02B 2075/125 Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
• CPC Class Codes: F02M 21/0254 Electric actuators, e.g. solenoid or piezoelectric
• CPC Class Codes: F02M 21/0266 Hollow stem valves; Piston valves; Stems having a spherical tip
• CPC Class Codes: F02M 21/0269 Outwardly opening valves, e.g. poppet valves
• CPC Class Codes: F02M 21/0275 for in-cylinder direct injection, e.g. injector combined with spark plug
• CPC Class Codes: F02M 51/0671 the armature having an elongated valve body attached thereto
• CPC Class Codes: F02M 57/06 the devices being sparking plugs
• CPC Class Codes: H01M 8/04089 of gaseous reactants
• CPC Class Codes: H01M 8/04186 of liquid-charged or electrolyte-charged reactants
• CPC Class Codes: Y02E 60/50 Fuel cells
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y02T 10/30 Use of alternative fuels, e.g. biofuels

Abstract

The present disclosure is directed to integrated injector/igniters providing efficient injection, ignition, and complete combustion of various types of fuels. One example of such an injectors/igniter can include a body having a base portion opposite a nozzle portion. The base portion receives the fuel into the body and the nozzle portion can be positioned adjacent to the combustion chamber. The injector further includes a valve carried by the nozzle portion that is movable between a closed position and an open position to inject the fuel into the combustion chamber. An actuator is coupled the valve and extends longitudinally through the body towards the base portion, and a driver is carried by the body and is movable between a first position and a second position. In the first position the driver does not move the actuator and in the second position the driver moves the actuator to move the valve to the open position.

Claims

1. A fuel injector configured to inject fuel into a combustion chamber, the fuel injector comprising:

a body having a base portion opposite a nozzle portion, wherein the base portion is configured to receive the fuel into the body and the nozzle portion is configured to be positioned adjacent to the combustion chamber;

a valve carried by the nozzle portion, wherein the valve is movable between a closed position and an open position to inject the fuel into the combustion chamber;

an actuator coupled the valve and extending longitudinally through the body towards the base portion; and

a driver carried by the body and movable between a first position and a second position, wherein in the first position the driver is spaced apart from the actuator and in the second position the driver moves the actuator to move the valve to the open position.

2. The fuel injector of claim 1 wherein the actuator further comprises a stop, and wherein the driver contacts the stop when the driver moves the actuator.

3. The fuel injector of claim 1 wherein driver includes a cavity extending longitudinally therethrough, and wherein the actuator is movably positioned in the cavity.

4. The fuel injector of claim 3 wherein the fuel flows through the cavity in the driver as the fuel passes through the injector.

5. The fuel injector of claim 1, further comprising a biasing member carried by the base portion of the body, wherein the biasing member urges the driver towards the first position.

6. The fuel injector of claim 1 wherein when the driver is in the first position the driver contacts and at least partially retains the valve in the closed position.

7. The fuel injector of claim 1, further comprising a force generator operably coupled to a controller, wherein the force generator induces the movement of the driver between the first and second positions to achieve desired fuel distribution via the valve.

8. The fuel injector of claim 1 wherein the driver at least partially gains momentum prior to contacting the actuator to move the valve to the open position.

9. The fuel injector of claim 1 wherein the actuator extends through the body coaxially within the driver.

10. The fuel injector of claim 1 wherein the actuator includes one or more monitoring fibers extending therethrough and operably coupled to the valve, wherein the one or more monitoring fibers are configured to detect one or more combustion chamber properties and transmit the one or more combustion chamber properties to a controller.

11. The fuel injector of claim 1 wherein the driver moves away from the nozzle portion when the driver moves from the first position to the second position.

12. The fuel injector of claim 1, further comprising a biasing member carried by the base portion of the body, wherein the biasing member urges the driver towards the nozzle portion.

13. The fuel injector of claim 1, further comprising an attractive element carried by the nozzle portion, wherein the attractive element at least partially retains the driver in the first position.

14. The fuel injector of claim 1 wherein the driver moves towards the nozzle portion when the driver moves from the first position to the second position.

15. The fuel injector of claim 1 wherein the actuator includes a stop, and wherein the fuel injector further comprises:

an actuator tensioner configured to contact the stop; and

a biasing member urging the actuator tensioner away from the nozzle portion to provide tension in the actuator and at least partially retain the valve in the closed position, wherein the driver contacts the actuator tensioner when the driver moves from the first position to the second position to at least partially relieve the tension in the actuator to move the valve to the open position.

16. The fuel injector of claim 15 wherein the driver is spaced apart from the actuator tensioner when the driver is in the first position.

17. A fuel injector configured to inject fuel into a combustion chamber, the fuel injector comprising:

a body having a base portion opposite a nozzle portion, wherein the base portion is configured to receive the fuel into the body and the nozzle portion is configured to be positioned adjacent to the combustion chamber;

a valve at the nozzle portion, wherein the valve is movable between a closed position and an open position;

an actuator having a first end coupled to the valve and a second end portion opposite the first end portion, wherein the second end portion has a stop;

a driver positioned in the body and movable between first and second positions, wherein in the first position the driver is spaced apart from the stop and in the second position the driver contacts the stop to move the actuator axially away from the nozzle portion to move the valve to the open position.

18. The fuel injector of claim 17, further comprising a biasing member carried by the base portion of the body, wherein the biasing member urges the driver towards the nozzle portion and at least partially retains the driver in the first position.

19. The fuel injector of claim 17 wherein the driver includes a first end portion opposite a second end portion, wherein the first end portion contacts the valve when the driver is in the first position to at least partially retain the valve in the closed position, and wherein the second end portion contacts the stop of the actuator to move the valve to the open position.

20. The fuel injector of claim 19 wherein the second end portion of the driver has a generally conical or frustoconical shape.

21. The fuel injector of claim 17 wherein the driver includes an actuator opening extending longitudinally through a central portion of the driver, wherein the actuator extends through the actuator opening, and wherein the driver is independently movable from the actuator.

22. The fuel injector of claim 21 wherein the driver further includes a fuel passageway spaced radially apart form the actuator opening and extending longitudinally through the driver, wherein the fuel passageway is configured to allow fuel to flow through the driver.

23. The fuel injector of claim 17 further comprising a magnet carried by the nozzle portion, wherein the magnet attracts the driver towards the nozzle portion to at least partially retain the driver in second position.

24. The fuel injector of claim 17 further comprising a force generator carried by the body, wherein the force generator is configured to create an electromagnetic force or piezoelectric force to move the driver.

25. The fuel injector of claim 17 wherein the driver moves a first distance before contacting the stop when moving away from the first position, and wherein the driver moves a second distance that is greater than the first distance when moving away from the first position to move the valve to the open position.

26. The fuel injector of claim 25 wherein the first distance is at least approximately 10-40% of the second distance.

27. A fuel injector configured to inject fuel into a combustion chamber, the fuel injector comprising:

a first insulator body having a first end portion opposite a second end portion and a first fuel passageway extending from the first end portion to the second end portion;

a second insulator body having an opening extending longitudinally therethrough, wherein the second end portion of the first insulator body is positioned in the opening of the second insulator body;

a conductor positioned between the second insulator body and the second end portion of the first insulator body, wherein the conductor is configured to be coupled to an energy source;

a conductive nozzle injection tip coupled to the conductor, wherein the nozzle injection tip includes a second fuel passageway fluidly coupled to the first fluid passageway, and wherein the nozzle injection tip is carried by the second end portion of the first insulator body and extends through a portion of the second insulator body;

a valve carried by the first end portion of the first insulator body, wherein the valve is movable between a closed position and an open position relative to the first fuel passageway; and

a driver movably positioned in the first end portion of the first insulator body, wherein the driver is configured to move the valve between the open and closed positions.

28. The fuel injector of claim 27 wherein the second end portion of the first of first insulator has a generally conical or frustoconical shape.

29. The fuel injector of claim 27 wherein the conductor is spirally wound around the second end portion of the first insulator body.

30. The fuel injector of claim 27 wherein the opening in the second insulator body has a first opening portion extending away from a second opening portion, the first opening portion having a generally conical or frustoconical shape narrowly tapering towards the nozzle injection tip, and the second opening portion having a generally conical or frustoconical shape narrowly tapering in an opposite direction from the first opening portion.

31. The fuel injector of claim 27, further comprising a conductive band coupled to an exterior interface between the first insulator body and the second insulator body, wherein the conductive band is coupled to the conductor and configured to be coupled to an ignition energy source.

32. The fuel injector of claim 27, further comprising:

a biasing member positioned in the first end portion of the first insulator body adjacent to the driver, wherein the biasing member is configured to urge the driver towards the second end portion of the first insulator body to at least partially retain the valve in the closed position; and

a force generator positioned in the first end portion of the first insulator body, wherein the force generator is configured to induce the movement of the driver to move the valve between the open and closed positions.

33. The fuel injector of claim 27, further comprising an elastically deformable seal covering at least a portion of the nozzle injection tip, wherein the deformable seal is configured to at least partially elastically deform to allow the fuel to exit the nozzle injection tip in response to a predetermined fuel pressure gradient in the injector.

34. The fuel injector of claim 27 wherein the nozzle injection tip further comprises a plurality of fuel delivery passageways fluidly coupled to the second fluid passageway, wherein individual fuel delivery passages extend away from the second fluid passageway at an inclined angle with reference to a longitudinal axis of the nozzle tip portion.

35. The fuel injector of claim 34, further comprising a deformable seal at least partially covering the plurality of fuel delivery passageways.

36. The fuel injector of claim 27 further comprising a metallic combustion chamber seal coupled to the second insulator body and configured to threadably engage an engine component, wherein the combustion chamber seal carries one or more ignition features that are configured to generate ignition events with the nozzle tip portion.

37. A fuel injector configured to inject fuel into a combustion chamber, the fuel injector comprising:

a body having a base portion opposite a nozzle portion;

a valve carried by the nozzle portion and movable between open and closed positions;

an actuator having a first end portion operably coupled to the valve and a second end portion opposite the first end portion, wherein the actuator includes an actuator stop at the second end portion;

a driver movably carried by the base portion and positioned between the actuator stop and the valve, wherein the driver is formed from an at least partially magnetic material;

an electromagnetic pole element carried by the base portion and positioned between the driver and the valve; and

a biasing member extending between the driver and the pole element, wherein the biasing member urges the driver away from the pole element to contact the actuator stop and tension the actuator to at least partially retain the valve in the closed position, and wherein the driver moves towards the pole element and at least partially compresses the biasing member to at least partially relieve tension in the actuator to allow the valve to move to the open position.

38. The fuel injector of claim 37 wherein the biasing member is a first biasing member and wherein the fuel injector further includes a second biasing member positioned between the driver and the pole element, and wherein the driver at least partially compresses the second biasing member when the driver moves towards pole element.

39. The fuel injector of claim 38 wherein the first biasing member is a coiled compression spring and wherein the second biasing member is a disk spring.

40. The fuel injector of claim 38 wherein the second biasing member is made from a non-magnetic material.

41. The fuel injector of claim 37, further comprising a fuel passageway extending longitudinally through the body, wherein the fuel passageway extends longitudinally through the driver and the pole element.

42. The fuel injector of claim 37 wherein the valve moves outwardly away from the nozzle portion when the valve moves to the open position.

43. A fuel injector configured to inject fuel into a combustion chamber, the fuel injector comprising:

a body having a base portion opposite a nozzle portion;

a valve carried by the nozzle portion and movable between open and closed positions;

an actuator extending through the body, wherein the actuator is coupled to the valve and includes an actuator stop spaced apart from the valve;

an actuator tensioner having a first side configured to contact the actuator stop and a second side opposite the first side;

a biasing member positioned between the valve and the actuator tensioner, wherein the biasing member contacts the second side of the actuator tensioner and urges the actuator tensioner towards the base portion to tension the actuator and at least partially retain the valve in the closed position;

a driver carried by the base portion adjacent to the first side of the actuator tensioner, wherein the driver is movable between a first position and a second position, and wherein in the first position the driver is spaced apart from the actuator tensioner and in the second position the driver contacts the second side of the actuator tensioner to relieve tension in the actuator and allow the valve to move to the open position.

44. The fuel injector of claim 43 wherein the driver gains momentum prior to contacting the second side of the actuator tensioner as the driver moves from the first position to the second position.

45. The fuel injector of claim 43, further comprising a magnet carried by the base portion, wherein the magnet attracts the driver and at least partially retains the driver in the first position.

46. The fuel injector of claim 43 wherein the actuator tensioner includes a central actuator opening and one or more fuel openings spaced radially outwardly from the actuator opening, wherein the actuator extends through the actuator opening, and wherein the fuel openings are configured to allow the fuel to flow through the actuator tensioner.

47. The fuel injector of claim 43, further comprising a force generator carried by the base portion, wherein the force generator induces the movement of the driver between the first and second positions.