Radio frequency interference suppression apparatus

Details Radio frequency interference suppression apparatus Radio frequency interference suppression apparatus

1974-03-26

1976-06-29

Myhre, Charles J.

Internal-combustion engines

Igniters

Incandescent

123148A, 123169PH, 313134, 338 66, 339143S, H04B 1502, H01R 1346, F02P 1100

Patent

active

039658791

ABSTRACT:
An ignition wiring system having the leads formed as a wire coil about a magnetizable core defines a distributed constant resistive-inductive series impedance. A metal shield is located over the spark plug proper and electrically connected to the engine ground. A flexible shield extension in the form of a coil extends over the lead from beneath the shield. The shield and shield extension introduce distributed capacitance between the special lead and engine ground. The combination of the shield and shield extension with the special lead forms a distributed constant RLC filter which produces RFI suppression. The shield and shield extension confine the electromagnetic radiation emanating from that portion of the lead where the radiation is strongest, thereby enhancing the suppression. The rapid discharge by the spark plug of the stored energy contained in the distributed capacitance increases the spark intensity and promotes more complete combustion.

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patent: 3683309 (1972-08-01), Hirose
patent: 3813643 (1974-05-01), Hartz

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