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채재우(J.O.Chae),이상만(S.M.Lee),박재근(J.K.Park),문승일(S.I.Moon),정영식(Y.S.Jeong),Alexander A. Martychenko(Alexander A. Martychenko) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
Misfire in a cylinder of an Internal Combustion Engine (ICE) causes such problems as high poisonous exhaust gases, catalytic converter overload, noise, vibration, etc The operation regimes where misfire is most likely to occure are idling, acceleration and deceleration. Our system of misfire diagnostics is based on using a spark-plug as a sensor for detecting misfire. Rather a high bias voltage applied between its electrodes generates a corona discharge. The current and voltage drop on this discharge depend on the pressure and temperature between spark-plug electrodes in cylinders. Development of misfire detection system is introduced in this paper. Such a simple sensor as a spark-plug can be widely used for misfire detection.
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/>
솔레노이드 밸브를 이용한 직접분사식 디젤기관의 분사율 제어 및 배기 저감에 관한 연구
채재우(J.O.Chae),이상만(S.M.Lee),황재원(J.W.Hwang),양이진(I.J.Yang),장석채(S.C.Chang),갈한주(H.J.Kal),정영식(Y.S.Jeong),A.A.Martychenko(A.A.Martychenko),Balin Andrei(Balin Andrei) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
A very fast solenoid valve has been developed to modulate the pressure of fuel pressure in the injection system of a D.I. Diesel engine. The working process of solenoid has been analyzed and calculated for each characteristic period. The modulated pressure by solenoid valve varies needle lifting process and therefore cause different injection rate. An investigation into the application of electronically controlled solenoid valve to reduce emissions of NOx and soot has been carried out in both conventional and newly designed solenoid valve actuated injection system. Conventional and electronically controlled comparisons of emission products were made under 1500 rpm engine speed, 3/4 load conditions. The outlook for the use of electronically controlled fuel injection technology is described in the light of the results obtained.<br/>
An Application Study of the System for Knocking-Effect Control on Real Car
J.O.Chae,A.A.Martychenko,S.W.Kim,S.C.Chung,G.M.Vasilev,A.V.Yurkevich 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The measurement of Ionization Current(IC) in the gasoline engine is one of perspective methods for knocking detector because combustion<br/> processes and moving of combustion products in the cylinder are<br/> accompanied as a rule by oscillation phenomena. The spark plug in gasoline engine can be used as knocking detector sensor. For this study, the system for the knocking-effect control of an engine was tested in the gasoline engine. The improvements of several major parameters for the driving car were found on the field-test. Also, more comfortably driving and more soft operation of the engine were noted subjectively.<br/>