Title:
PRE-CHAMBER SPARK PLUG
Document Type and Number:
WIPO Patent Application WO2006011950
Kind Code:
A9
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 preignition. The volume behind the electrodes provides a volume for burnt products from previous combustion cycles and leads to more reliable igntion.
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Inventors:
TOZZI LUIGI P (US)
SALTER DOUGLAS W (US)
SALTER DOUGLAS W (US)
Application Number:
PCT/US2005/020121
Publication Date:
April 05, 2007
Filing Date:
June 07, 2005
Export Citation:
Assignee:
WOODWARD GOVERNOR CO (US)
TOZZI LUIGI P (US)
SALTER DOUGLAS W (US)
TOZZI LUIGI P (US)
SALTER DOUGLAS W (US)
International Classes:
H01T13/54; F02B19/00
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