Spark ignition and fuel injector system for an internal combustion engine

• US 20080006238A1
• Filed: 07/03/2007
• Published: 01/10/2008
• Est. Priority Date: 07/05/2006
• Status: Active Grant

• Current Assignee: Advanced Propulsion Technologies, Inc.
• Original Assignee: Advanced Propulsion Technologies, Inc.
• Inventors: Ebbeson, Bengt Ebbe Oskar, Hofbauer, Peter
• Granted Patent: US 7,650,873 B2
• Time in Patent Office: Days
• US Class Current: 123/298
• CPC Class Codes: F02M 57/06 the devices being sparking plugs

Abstract

An improved spark ignition system for an internal combustion engine that includes a pair of electrodes disposed to extend from opposite sides and into a combustion chamber to form a spark gap between them that is central to the combustion chamber. Each electrode is integral with a conductive fuel delivery tube that contains a capillary passage and fuel outlet ports adjacent the electrode. The heat from combustion conducted into the electrodes and fuel delivery tubes is used to vaporize the fuel within the capillary passages before it exits the outlet ports as an atomized fog into the combustion chamber adjacent the spark gap. The vaporization of the fuel flowing in the capillary passages absorbs energy from the electrodes and thus performs a cooling effect on the electrodes. The spacing of the electrodes from opposite sides of the cylinder also allows a design that can utilize and increased spark gap to produce a larger spark across the gap.

Claims

1. A system for producing a spark in a combustion chamber in the cylinder of an internal combustion engine comprising:

a pair of electrodes extending into the combustion chamber portion of a cylinder;

said electrodes having tips opposing each other across a spark gap of a predetermined distance;

said electrodes each being supported by and integral with a fuel delivery tube of electrically conductive material and having a capillary tubular passage to allow the flow of fuel therethrough;

said electrodes being located at the ends of said tubes and said tubes having a plurality of ports in communication with said capillaries and adjacent said electrodes for allowing the injection of fuel into said combustion chamber adjacent said spark gap.

2. The system of claim 1, wherein said electrodes extend into the combustion chamber portion of a cylinder from opposite sides of said cylinder.

3. A system as in claim 2, wherein said electrodes extend into the combustion chamber portion of a cylinder from opposite sides of said cylinder and are coaxial with each other.

4. A system as I claim 1, wherein said electrodes each extend into the combustion chamber portion of a cylinder along a radial towards the center of said chamber at an angle to each other.

5. A system as in claim 1, wherein said electrodes and said fuel delivery tubes are electrically isolated from the common ground potential of said engine.

6. A system as in claim 1, wherein said electrodes are cooled by the flow of fuel through said capillaries and said ports.

7. A system as in claim 1, wherein said electrically conductive fuel delivery tube is formed of a material from the group including nickel and stainless steel.

8. A system as in claim 1, further including a source of pressurized fuel, a controlled injector metering valve, and a check valve associated with each capillary tube, wherein each said check valve is located between said metering valve and said associated capillary tube to prevent combustion pressures created in said combustion chamber from adversely affecting said metering valve.

9. A fuel injector tube and spark electrode combination including a threaded connector housing for connecting said combination to a correspondingly threaded port on the cylinder of an internal combustion engine;

an electrically conductive capillary tube extending from said housing, a single electrode tip carried at the end of said capillary tube;

an electrical connector on said housing being electrically connected to said capillary tube and said electrode tip;

a fuel line connection on said housing being in communication with said capillary tube to allow fuel provided from a pressurized source to flow into said capillary tube;

said capillary tube containing at least one opening adjacent said electrode tip to allow said fuel to exit said capillary tube.

10. The combination of claim 9, wherein said capillary tube contains a plurality of openings immediately adjacent to said electrode tip.

11. The combination of claim 9, wherein said capillary tube, said electrode tip, said electrical connector, and said fuel line connection are electrically isolated from said connector housing.

12. The combination of claim 9, wherein a plurality of said combinations are employed in an internal combustion engine to provide an air gap between opposing electrode tips and applying an electrical potential to each electrical connector at a predetermined time in the cycle of said engine sufficient to generate an arc across said gap.

13. The combination of claim 12, wherein a pair of said combinations is employed in the cylinders of an opposing piston opposing cylinder internal combustion engine and each electrode is positioned to define said gap near the center of the cylinder in a defined combustion chamber.

14. The combination of claim 13, wherein the fuel exiting said capillary tube openings adjacent said electrode tips is atomized and produces an air/fuel cloud mixture that surrounds said gap.

15. The combination of claim 14, wherein said electrical potential is isolated from ground that is in common with the cylinders of said engine.

16. The combination of claim 13, wherein said electrodes extend into the combustion chamber portion of a cylinder from opposite sides of said cylinder.

17. The combination of claim 13, wherein said electrodes extend into the combustion chamber portion of a cylinder from opposite sides of said cylinder and are coaxial with each other.

18. The combination of claim 13, wherein said electrodes each extend into the combustion chamber portion of a cylinder along a radial towards the center of said chamber at an angle to each other.

19. The combination of claim 13, wherein said electrodes are cooled by the flow of fuel through said capillaries and said ports.

20. The combination of claim 13, further including a source of pressurized fuel, a controlled injector metering valve, and a check valve associated with each capillary tube, wherein each said check valve is located between said metering valve and said associated capillary tube to prevent combustion pressures created in said combustion chamber from adversely affecting said metering valve.