IGNITION SYSTEM AND SPARK PLUG

Title:

IGNITION SYSTEM AND SPARK PLUG

Document Type and Number:

WIPO Patent Application WO/2012/032846

Kind Code:

A1

Abstract:

An ignition system comprises a spark plug (1), a power supply for discharge (32), and an AC power supply (33). The spark plug (1) further comprises: an insulator (2) having a shaft (4); an electrode (8) which is disposed within the shaft (4), and positioned such that the leading end thereof is closer to the leading end side than the leading end of the insulator (2); a main metal fitting (3) which is positioned on the exterior circumference of the insulator (2); and a grounding electrode (27) which is anchored to the leading end part of the main metal fitting (3), and which forms a plasma discharge gap (28) between said grounding electrode (27) and the leading end part of the electrode (8). The voltage from the power supply for discharge (32) and the AC power from the AC power supply (33) are supplied via the electrode (8) to the plasma discharge gap (28), and the AC power from the AC power supply (33) is injected into the plasma occurring in the plasma discharge gap (28) by the voltage from the power supply for discharge (32). Energy is thus efficiently injected into the plasma, allowing dramatic improvements in ignition without incurring increased manufacturing costs.

Inventors:

KATSURAYA KOHEI (JP)
NAKAYAMA KATSUTOSHI (JP)

Application Number:

PCT/JP2011/065771

Publication Date:

March 15, 2012

Filing Date:

July 11, 2011

Export Citation:

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Assignee:

NGK SPARK PLUG CO (JP)
KATSURAYA KOHEI (JP)
NAKAYAMA KATSUTOSHI (JP)

International Classes:

H01T13/50; F02P3/00; F02P3/01; H01T13/20

Foreign References:

JP2010101208A	2010-05-06
JP2005243435A	2005-09-08
JP2010529363A	2010-08-26
JP2006120649A	2006-05-11
JP2009008100A	2009-01-15
JP2009038026A	2009-02-19
JP2009037750A	2009-02-19

Other References: