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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/>
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/>
Multivone모델을 이용한 분사율 변화에 따른 직접분사식 디젤엔진의 배기가스 특성 예측에 관한 연구
황재원(J.W.Hwang),박재근(J.H.Park),갈한주(H.J.Kal),김만호(M.H.Kim),Liu Sheghua(Liu Shemghua),채재우(J.O.Chae) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
A multizone phenomenological combustion model, in which the burn rate is governed by the rate of fuel vaporization and mixing, is developed to study the effects of fuel injection rate shapes on exhaust emissions of direct injection diesel engines. The extended Zel'dovich mechanism is used to estimate the NO formation. This model is calibrated with the experimental data. Comparison between the results calculated by the model and experimental results shows that the model has a good predictive capability for cylinder pressure, heat release rate and exhaust emissions. And this study was investigated according to injection rate shapes. The results predicted by the model show that fuel amount of premixed combustion affects NO formation and NO is reduced by 14% with soot 7% increased at 1900rpm 50% load condition.<br/>