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스파크플러그를 이용한 실린더내의 실화강도 측정에 관한 연구
황재원(J.W.Hwang),박재근(J.K.Park),고용수(Y.S.Ko),조민석(M.S.Jo),A.A.Martychenko(A.A.Martychenko),채재우(J.O.Chae) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
Engine misfires (total or partial) cause a negative effect on exhaust emissions such like HC, CO and NOx. Moreover, it causes damage the three-way-catalyst(TWC) system permanently. So, it make shorten the life time of TWC. These are basic reasons why Environmental Protection Agency(EPA) and the California Air Resources Board (CARB) mandated the detection of engine misfires in their OBD-II (On-Board Diagnostics II) regulations. For the last several years, automobile manufacturers and their suppliers have been working on various solutions for the misfire detection challenge. Many have implemented a solution called Crankshaft Velocity Flluctuation(CVF). which utilizes the crank sensor input to calculate the variation of the crankshaft rotational speed. But this approach limited due to the fact that there could be problem during certain engine condition such like deceleration or high speed condition. This study introduced the new method of misfire detection using breakdown voltage(BDV) between electrodes. This misfire detection system also predict the engine pressure, temperature indirectly using paschen's law<br/>
스파크플러그를 이용한 실린더내의 이상폭발검출에 관한 연구
채재우(J.O.Chae),박재근(J.K.Park),고용수(Y.S.Ko),조민석(M.S.Cho),황재원(J.W.Whang) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
Detonation or knocking-effect. a kind of abnormal combustion, is a highly undesirable effect in the internal combustion engine. A spark plug is frequently used in detonation detection systems. The system created by the authors of the present paper is based on the effect of modulation of the breakdown voltage of the spark gap. The voltage drop between spark plug electrodes, when an electrical breakdown is initiated, depends on the local gas density. Detonation produces rapid changes in gas pressure (and. consequently, its density). A signal obtained from a spark plug carries information about the character of combustion. Possible algorithms of signal processing are discussed in the present paper.<br/>