High power discharge fuel ignitor
View Patent ↗A spark-ignited, internal combustion engine ignition device to increase electrical transfer efficiency of the ignition by peaking the electrical power of the spark during the streamer phase of spark creation and improving combustion quality, incorporating an electrode design and materials to reduce electrode erosion due to high power discharge, an insulator provided with capacitive plates to peak the electrical current of the spark discharge, and concomitant methods.
1. A high power discharge ignition device for an internal combustion engine, comprising:
an insulator having an upper end and a lower end and defining a cavity therein, said insulator including an outside diameter and an inside diameter and comprising an alumina material;
a first conductor bonded to at least a portion of said inside diameter of said insulator body;
a second conductor bonded to at least a portion of said outside diameter of said insulator body, said first conductor, said second conductor, and said insulator forming a capacitor wherein at least one of said first conductor or said second conductor comprises a conductive ink;
a tip assembly disposed in said cavity of said insulator, said tip assembly comprising a positive electrode tip;
a resistor member disposed in said cavity and connected to said tip assembly, said resistor member comprising a resistor frit material;
an electrical connector coupled to said resistor member; and
a shell attached to said second conductor, said shell including a negative electrode having a tip formed thereon and spaced apart from said positive electrode tip.
2. The device of claim 1 wherein said resistor member comprises a resistor and spring assembly.
3. The device of claim 1 wherein said resistor frit material comprises a carbon and glass compound material.
4. The device of claim 1 further comprising a second frit material disposed in said cavity and connected to said tip assembly and said resistor frit material.
5. The device of claim 4 wherein said second frit material comprises a copper alloy, said copper alloy sealing said lower end of said insulator.
6. The device of claim 4 wherein said resistor frit material is coupled to said second frit material by a gas seal insert member.
7. The device of claim 1 wherein said first conductor comprises a silver ink.
8. The device of claim 1 wherein said second conductor comprises a precious metal alloy.
9. The device of claim 1 wherein said second conductor comprises a coating of silver conductive ink, said coating having a predetermined thickness.
10. The device of claim 1 wherein said alumina material comprises from about 80 percent to about 99 percent pure alumina.
11. The device of claim 1 wherein said positive and negative electrode tips comprise a sintered rhenium and molybdenum material.
12. The device of claim 11 wherein said material is formed from about at least 50 percent rhenium and at most about 50 percent molybdenum.
13. The device of claim 11 wherein said material is formed from about 75 percent rhenium and about 25 percent molybdenum.
14. The device of claim 1 wherein said capacitor has a predetermined capacitance in the range from about 30 to about 100 pf.
15. The device of claim 1 wherein said tip assembly is attached to said first conductor by a silver paste, said silver paste sealing said lower end of said insulator.
16. The device of claim 1 wherein said tip assembly is connected to said first conductor, said positive electrode tip extending from said insulator, said tip assembly sealing said lower end of said insulator.
17. The device of claim 1 wherein said electrical connector seals said upper end of said insulator.