Electric lamp or space discharge component or device manufacturi – Process – Spark plug or spark gap making
Reexamination Certificate
2011-04-12
2011-04-12
Santiago, Mariceli (Department: 2879)
Electric lamp or space discharge component or device manufacturi
Process
Spark plug or spark gap making
C313S143000, C123S1690EL
Reexamination Certificate
active
07922551
ABSTRACT:
A method and apparatus to maximize spark plug life in pre-chamber spark plugs operating with ultra-lean mixtures and/or elevated engine BMEP is presented. Electrode erosion is reduced by spreading discharge energy over a wider surface area, maintaining fuel concentration in the spark gap, controlling gas static pressure during discharge, and maintaining safe electrode temperature. Energy is spread via a swirling effect created by periphery holes in an end cap, resulting in a lower specific energy discharge at the electrodes. Divergently configured electrodes reduce the spark voltage at high operating pressures and the energy required for ignition. The flow field generated at the electrodes prevents electrical shorts due to water condensation and avoids misfire. The center electrode insulation provides an effective heat transfer path to prevent electrode overheating and pre-ignition. The volume behind the electrodes provides a volume for burnt products from previous combustion cycles and leads to more reliable ignition.
REFERENCES:
patent: 1538750 (1925-05-01), Scognamillo
patent: 2047575 (1936-07-01), Burtnett
patent: 2208030 (1940-07-01), Holmes
patent: 2843780 (1958-07-01), Harper, Jr.
patent: 4490122 (1984-12-01), Tromeur
patent: 4795937 (1989-01-01), Wagner et al.
patent: 4901688 (1990-02-01), Kashiwara et al.
patent: 4963784 (1990-10-01), Niessner
patent: 5014656 (1991-05-01), Leptich et al.
patent: 5554908 (1996-09-01), Kuhnert et al.
patent: 5555862 (1996-09-01), Tozzi
patent: 5619959 (1997-04-01), Tozzi
patent: 5947076 (1999-09-01), Srinivasan et al.
patent: 6013973 (2000-01-01), Sato
patent: 6064144 (2000-05-01), Knoll et al.
patent: 6198209 (2001-03-01), Baldwin et al.
patent: 6460506 (2002-10-01), Nevinger
patent: 7628130 (2009-12-01), Johng
patent: 2002/0180326 (2002-12-01), Francesconi et al.
patent: 2005/0211217 (2005-09-01), Boley et al.
patent: 2007/0236122 (2007-10-01), Borror
patent: 2825995 (2006-10-01), None
U.S. Appl. No. 10/806,525, filed Sep. 29, 2005, Boley et al.
Maria-Emmanuella McCoole, M.Sc.E.E. et al.; Solutions for Improving Spark Plug Life in High Efficiency, High Power Density, Natural Gas Engines; Proceedings of ICES2006; ASME Internal Combustion Engine Division 2006 Spring Technical Conference; May 8-10, 2006, Aachen, Germany; ICES2006-1417; pp. 1-8.
Dr. Luigi Tozzi et al.; Advanced Combustion System Solutions for Increasing Thermal Efficiency in Natural Gas Engines While Meeting Future Demand for Low NOx Emissions; Proceedings of JRCICE2007; 2007 ASME/IEEE Joint Rail Conference & Internal Combustion Engine Spring Technical Conference; Mar. 13-16, 2006, Pueblo, Colorado USA; JRCICE2007-40026; pp. 1-7.
Jessica Adair et al.; Knock Characterization Using Ionization Detection; GMRC Gas Machinery Conference; Oklahoma City, Oklahoma; Oct. 2006; pp. 1-23.
Reinhart Boerner Van Deuren P.C.
Santiago Mariceli
Woodward, Inc.
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