• 한국인터넷방송통신학회논문지
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• 제13권2호
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• pp.121-125
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• 2013

무배전기식 불꽃 점화 시스템의 스파크 플러그 케이블에서 발생되는 전자파에 대한 분석이다. 무배전기식 불꽃 점화 시스템인 경우에는 점화코일이 고주파 발생원이고 스파크 플러그 케이블과 스파크 플러그는 전자파를 복사하는 안테나로 동작 할 수 있다. 스파크플러그 케이블과 스파크 플러그의 길이를 측정하여 ${\lambda}/4$ 수직 접지 안테나로 동작하는 안테나로 고려하여 HFSS를 이용하여 공진주파수를 계산하였다. 계산된 공진주파수와 엔진룸에서 복사되는 전자파의 전력 스펙트럼 분포를 측정한 결과를 분석하여 무배전기식 불꽂 점화 시스템이 특정한 주파수 대역에서 고주파 에너지를 복사한다는 것을 알 수 있다.

• 한국자동차공학회논문집
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• 제6권3호
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• pp.115-122
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• 1998

For digital engine control timings, such as ignition, are based on the crank shaft angle. Therefore, it is very important that the angle of the crank shaft can be detected with accuracy for optimal ignition timing. Sequential multi-point injection(MPI) systems that have independent injection events for each cylinder, are used to inject an accurate quantity of fuel, and to cope with varying engine status promptly. In this study the distributorless ignition timing. A crankshaft position sensor has been installed such that it generates a number of pulses per crankshaft revolution to permit accurate detection of the crank shaft angle. An event detecting algorithm has been developed, which detects the crank shaft pulses generated by the position sensor, and the software outputs the required control signals at given crank angle values. We clarified that the hardware method is the best way to increase the performance of the control system, because the event detecting duration T(1+2)max becomes zero.

• 한국자동차공학회논문집
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• 제16권1호
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• pp.45-51
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• 2008

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.