Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Analysis on the Power Spectrum of Electromagnetic Waves Radiating from the Distributorless Spark Ignition System

무배전기식 불꽃 점화 시스템에서 복사되는 전자파의 전력 스펙트럼 분석

  • 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)
  • 최광제 (한라대학교 전기전자공학과) ;
  • 조시기 (한라대학교 전기전자공학과) ;
  • 정원락 (한라대학교 기계자동차공학부) ;
  • 장성국 (한라대학교 기계자동차공학부) ;
  • 강신한 (한라대학교 기계자동차공학부)
  • Published : 2008.02.01
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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.

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References

  1. G. J. Choe, S. G. Jho, W. L. Jeung, S. K Jang and S. H. Kang, "Analysis of Electro-magnetic Wave Radiating from an Ignition Plug and High-voltage Cable inside an Engine Room," Transactions of KSAE, Vol.12, No.1, pp.201- 215, 2004
  2. G. J. Choe, "An Experimental Study on Relation Ship of the Engine rpm and the Strength of Electro-magnetic Waves in the Engine Room," Transactions of KSAE, Vol.14, No.3, pp.112- 118, 2006
  3. T. Denton, Automobile Electrical and Electronic Systems, Arnold, London, pp.110-129, 1997
  4. S. Y. Liao, Microwave Circuit Analysis and Amplifier Design, Prentice-Hall, Englewood Cliffs, New Jersey, pp.8-52, 1987
  5. C. H. Durney and C. C. Johnson, Introduction to Modern Electromagnetics, McGraw-Hill Book Co. Inc., Seoul, pp.316-351, 1986
  6. R. W. P. King, The Theory of Linear Antennas, Harvard University Press, Cambridge, Massachusetts, pp.24-69, 1956
  7. E. C. Jordan and K. G. Balmain, Electromagnetic Waves and Radiation Systems, Prentice Hall, Englewood Cliffs, New Jersey, pp.345-396, 1968
  8. T. L. Floyd, Electric Circuit Fundamentals, Prentice Hall, Englewood Cliffs, New Jersey, pp.574-620, 1995
  9. M. J. Lee, M. Hall, O. A. Ezekoye, R. Matthews and S. S. Chung, "A Study on Behaviour and Characteristics of Spark Discharge in Spark Ignition System," Transactions of KSAE, Vol.14, No.1, pp.100-108, 2006
  10. M. E. Van Valkenburg, Network Analysis, Prentice Hall, Englewood Cliffs, New Jersey, pp.452-483, 1974
  11. S. A. Balanis, Antenna Theory, John Wiley & Sons, New York, pp.133-194, 1997