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소형 2행정 엔진에서의 개선된 디지털 콘덴서 점화 방식 적용에 관한 연구
갈한주(H.J.Kal),Ke Zeng(Ke Zeng),박재근(J.K.Park),황재원(J.W.Hwang),채재우(J.O.Chae),정영식(Y.S.Jeong) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
A Digital CDI(Capacitor Discharge Ignition) device is developed in this paper. This CDI. which has a micro-controller as its kernel. can have more flexible spark timing with engine speed than the conventional CDI used in most motorcycle engines owing to its programmable characteristics.<br/> The principle of this digital CDI and the design of hardware and software are presented in this pater. Engine test with this CDI is carried out to optimize engine performance. Also comparison between conventional CDI and digital CDI is carried out.<br/> The results shows that this digital CDI can provide a better spark timing than the conventional CDI. Tests of part load(30% throttling position) and full load(100% throttling position) show that the engine power is increased around 10-20% and fuel consumption is decreased around 10-20% simultaneously.<br/> As this dinital CDI has simple structure, low cost and very little modification are required. It is a promising substitute for the widely used conventional CDI.<br/>
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/>
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.
[가솔린엔진부문] 밸브오버랩기간과 양정변화가 엔진특성에 미치는 영향
황재원(J.W. Hwang),김만호(M.H.Kim),김웅혁(U.H.Kim),박재근(J.K.Park),채재우(J.O.Chae) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1
In this study, a zero-dimensional two zone model is developed to investigate the effects of valve overlap period and valve lift on combustion and gas exchange process in SI engine. The simulation results show that the predicted data has good agreement with experimental ones. The useful information of combustion and gas exchange process such like residual gas fraction, cylinder pressure, mass flow rate and volumetric efficiency can be obtained and the effects of engine variables on combustion processes and performances can be evaluated.
[가솔린엔진] 밸브개폐시기가변에 따른 엔진 특성의 예측에 관한 연구
황재원(J.W. Hwang),김만호(M.H. Kim),박재근(J.K. Park),Wu deyu,Liu Shenghua,채재우(J.O. Chae) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, a zero-dimensional two zone model is developed to investigate the effects of variable valve timing on combustion process in SI engine. The simulation results show that the predicted data has good agreement with experimental ones. The useful information of combustion process such like residual gas fraction, cylinder pressure, cylinder temperature and NO concentration can be obtained and the effects of engine variables on combustion processes and performances can be evaluated
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/>
[가솔린엔진] 가솔린기관에서 스파크플러그를 이용한 노킹 및 실화의 동시검출시스템의 개발에 관한 연구
조민석(M.S. Jo),박재근(J.K. Park),손창업(C.E. Son),황재원(J.W. Hwang),채재우(J.O. Chae) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Knocking and mislire. kinds of abnormal combustion. are highly undesirable effect on the internal combustion engine. So. it is important to detect these abnormal combustion and control the ignition timing etc. to avoid these mal-effect factors in real engine system. In this study. the system which detect the knocking and misfire using by spark plug is presented. This system is based on the effect of modulation of the breakdown voltage(BDV) of the spark gap. The voltage drop between spark plug electrodes. when an electrical breakdown is initiated. depends on the temperature and pressure in combustion chamber. So. we can detect knock and misfire that produce changes in gas temperature and pressure (consequently, its density) by BDV signal change which carries information about the character of combustion.