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An Experimental Study on the Characteristics of Electromagnetic Radiation From Automotive Ignition System
Published June 28, 1996 by Society of Automotive Engineers of Korea in South Korea
Event: KSAE Spring Conference
The ignition system of any sparked-ignited internal combustion engine-powered device is well recognized as a major sources of radiated electromagnetic interference (EMI). Measurements of the electromagnetic noise radiated by automotive ignition systems were made at 150 kHz 1 GHz. With the widespread use of various electrical appliances in daily life, there has been an increase in unnecessary radiated electromagnetic waves influencing many spheres of social life. In addition to the radiation of unnecessary electromagnetic waves by electrical machinery, considerable noise arises from ignition systems of internal combustion engine. Automotive ignition noise is due to fast rise-time (impulsive) currents that flow in the vehicle''s wiring. The three major sources of impulses are the breakdown in the distributor of the gap between the rotor and the posts, the breakdown of the spark plug gap, and the closure of the breaker points. Each of these sources can be treated individually to suppress the ignition noise.