Spark plug for internal combustion engine

Details Spark plug for internal combustion engine Spark plug for internal combustion engine

2005-02-22

2005-02-22

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S143000

Reexamination Certificate

active

06858974

ABSTRACT:
A spark plug for internal combustion engine, which produces a spark discharge that ignites air-fuel mixture in the combustion chamber and causes combustion such that an ionic current flow during combustion can be utilized for detecting misfire of the engine. The spark plug the core connected to an ignition coil, a center electrode made of at least one of iridium and an iridium alloy and connected to the core through a seat, and a ground electrode separated from the center electrode with a gap. A sum of surface areas of the seat and the center electrode is not less than a prescribed value, specifically, is not less than 11.0 mm2, and more specifically, is not less than 11.47 mm2. Even when the diameter of the center electrode is reduced in the interest of improving ignition performance, improved ignition performance and improved ionic current detection accuracy can be achieved simultaneously.

REFERENCES:
patent: 5929556 (1999-07-01), Matsubara et al.
patent: 05-099956 (1993-04-01), None
patent: 2000-34969 (2000-02-01), None

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