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Analysis on the Power Spectrum of Electromagnetic Waves Radiating from the Distributorless Spark Ignition System  

Choe, Gwang-Je (Department of Electrical & Electronic Engineering, Halla University)
Jho, Shi-Gie (Department of Electrical & Electronic Engineering, Halla University)
Jeung, Weol-Rark (School of Mechanical and Automotive Engineering, Halla University)
Jang, Sung-Kuk (School of Mechanical and Automotive Engineering, Halla University)
Kang, Shin-Han (School of Mechanical and Automotive Engineering, Halla University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.16, no.1, 2008 , pp. 45-51 More about this Journal
Abstract
This paper presents theoretical and experimental analysis on the characteristics of the power spectrum of electormagnetic waves radiating from the spark plug and their cables of a distributorless ignition system. The theoretical study was conducted applying the microwave transmission line theory and the antenna theory. The experimental works were carried out to measure the standing wave ratio(SWR) and the radiation power spectrum of this system. As a result, it has been found that a spark plug and its cable is working as a monopole antenna radiating elelctromagnetic waves. Because of its similar structure to a monopole antenna, the envelope of radiation power spectrum distribution has a bell shape which can be obtained from a monopole antenna operating as a series resonant circuit. The frequency characteristics from the SWR measurements show a similar frequency characteristics of power spectrum of the system studied. Also, it has been found that the density of the power spectrum of the system fitting a long time used spark plug is higher than that of fitting a new spark plug.
Keywords
Distributorless spark ignition system; Microwave transmission line theory; Standing wave ratio:SWR; Radiation power spectrum; Monopole antenna;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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