Large discharge-volume, silent discharge spark plug

Details Large discharge-volume, silent discharge spark plug Large discharge-volume, silent discharge spark plug

1993-03-31

1995-11-21

O'Shea, Sandra L.

Electric lamp and discharge devices

Spark plugs

Electrodes are pure figures of revolution about plug axis

313128, 313130, 313141, 313143, H01T 1320

Patent

active

054690137

ABSTRACT:
A large discharge-volume spark plug for providing self-limiting microdischarges. The apparatus includes a generally spark plug-shaped arrangement of a pair of electrodes, where either of the two coaxial electrodes is substantially shielded by a dielectric barrier from a direct discharge from the other electrode, the unshielded electrode and the dielectric barrier forming an annular volume in which self-terminating microdischarges occur when alternating high voltage is applied to the center electrode. The large area over which the discharges occur, and the large number of possible discharges within the period of an engine cycle, make the present silent discharge plasma spark plug suitable for use as an ignition source for engines. In the situation, where a single discharge is effective in causing ignition of the combustible gases, a conventional single-polarity, single-pulse, spark plug voltage supply may be used.

REFERENCES:
patent: 1905957 (1933-04-01), Anderson
patent: 2168206 (1939-08-01), Hastings
patent: 3890518 (1975-06-01), Tombs
patent: 4301782 (1981-11-01), Wainwright
patent: 4926088 (1990-05-01), Kler
Baldur Eliasson et al., "Nonequilibrium Volume Plasma Chemical Processing," IEEE Transactions on Plasma Science 19, No. 6, 1067-1077 (1991).
Manabu Higashi et al., "Soot Elimination and NO.sub.x and SO.sub.x Reduction in Diesel-Engine Exhaust by a Combination of Discharge Plasma and Oil Dynamics," IEEE Transactions on Plasma Science 20, NO. 1, 1-11 (1992).

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