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엄명도(M.D.Eom),한영출(Y.C.Han),김종춘(J.C.Kim),김경배(K.B.Kim) 한국자동차공학회 1996 한국자동차공학회 학술강연초록집 Vol.1996 No.10
CNG dual fuel engine for heavy duty diesel engine developed by AFS International in Canada has been equipped to a Korean bus engine and tested to compare the engine performance and the emission characteristics with the existing diesel fueled engine. The results are summarized as follows. Diesel only engine has the fuel injection timing of BTDC 17˚. The injection timing of CNG conversion engine is retarded to BTDC14° for reduction of NOx. The injection timing of BTDC 10° shows unstable engine performance and after burning at above 2000rpm, which concludes BTDC 14° as a optimum retarded timing. Performance optimization has been carried out to have engine power equivalent to or better than the diesel only engine. Smoke is decreased by 85% by Korean smoke 3 mode test. By 6 mode test CO is. increased by 313% and THC is increased by 1407%. NOx is decreased by 27%. D-13 mode of 1996 Korean regulation shows the similar result as 6 mode test. Even though THC is increased very much, it's not too serious problem since CO and HC emission of diesel engine is very little compared to gasoline engine and more than 75% of THC is CH₄.
류정호(J.H.YOU),정일록(I.R. CHUNG),엄명도(M.D.EOM),김종춘(J.C.KIM),신영조(Y.J.SHIN),임철수(C.S.LIM),이호영(H.Y.LEE) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
The effects of sulfur content of diesel fuel on oxidation catalyst were investigated using from 0.2 weight % to 0.05 weight % sulfur content fuel on engine dynamometer and the characteristics of the emission reduction were tested using the prepared catalyst at various operating conditions such as T-6 mode with and without Pt/V and Pt catalysts in the exhaust system.<br/> In addition. the prepared catalytic converter was installed to a heavy-duty diesel engine and light-duty diesel vehicle. Then the emission reduction performance of Pt/V and Pt catalyst was also compared with each regulation test mode such as D-13 CVS-75 mode<br/> The emission reduction performance of Pt catalyst with respect to CO, HC, SOF and aldehyde was found to be a little bit higher than that of Pt/V catalyst, but Pt catalyst showed the innate disadvantage of causing the increase of PM due to the sulfate formation via high SO₂ conversion at high exhaust temperature especially above 500℃ in heavy-duty diesel engine.<br/> In the D-13 mode, PM reduction efficiency of Pt catalyst equipped heavy-duty diesel engine is lower than that of Pt/V catalyst caused by increasing sulfate in the high exhaust temperature but in the CVS-75 mode. Pt catalyst equipped light-duty vehicle showed higher PM reduction efficiency than that of Pt/V catalyst.<br/>
김종춘(J.C. Kim),엄명도(M.D Eom),박용희(Y.H Park),이종태(J.T Lee),이상문(S.M Lee),신용호(Y.H. Shin) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
At this study. the research showed the compared analysis results for the limited regulation of emission gas CO. HC. Nox. Also. it classified by combustion system. displacement. odometer and before-after of maintenance among 47 vehicles of 50250cc 5 fleets which made in Korea. 55 vehicles of 400-1800cc 7 fleets which imported. It is 102 vehicles of 12 fleets in total. Regarding some vehicles below 50cc. We compared the difference of emission gas and visible colors according to various engine oils.<br/> The test methods of emission gas are as follows.<br/> The vehicles of below 50cc is tested by ECE-47 mode. And the others is tests by ECE-40 mode.<br/>
LPG자동차의 연료성분에 따른 오염물질 배출특성에 관한 연구
김종춘(J.C Kim),엄명도(M.D Eom),박용희(Y.H Park),이종태(J.T Lee) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
A Study of Exhaust Emission Characteristics Depending On Fuel Contents of LPG Vehicles. <br/> Diesel engine vehicles emitting the particulate matters (PM) and Nitrogen Oxides (NOx) into the air take 29% of the whole car population in Korea, which is higher than that of the advanced countries.<br/> Therefore, the government is encouraging to use LPG fueled vehicles in place of diesel fueled vehicles, and the number of LPG vehicles is increasing.<br/> The LPG having less carbons in molecular structure compared with gasoline is evaluated as clean fuel as it creates less hydrocarbon (HC) and carbon dioxide (CO2), and less PM and NOx.<br/> However, the current fuel supply system of an LPG engine supplying the fuel into an engine is of a mixer type by which fuel is supplied in a gas state, and the air-fuel ratio is not controlled as precise as the liquid injection type used in a gasoline engine, and it results in more emissions as the engine ages due to varying air-fuel ratio.<br/> Therefore, it is inevitable to develop a technology enabling a liquid injection of LPG to achieve low emission of LPG vehicles. LPG is a mixture of butane and propane which have different number of carbon and hydrogen, and it causes difficulty in starting a cold engine in winter affecting emissions as well.<br/> Therefore, by changing the contents butane and propane of LPG and by measuring and analyzing the emission in different driving modes, the study is focused on finding a fuel suitable for an LPLi system to be developed in the future.<br/> As a result, it was learned that the emission is dependent on the fuel content, i.e. higher rate of propane causes less emission in general.
류정호(J H Ryu),엄명도(M D Eom),임철수(C S Lim),김예은(Y E kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Diesel engines which emit a lot of PM and NOx have been known as a main ai polluter. Especially, diesel particulate matters(DPM) including black smoke arc hazardous ai<br/> pollutants to human health and environment. The emission characteristics according to particle size as well as aftertreatment equipments were analyzed. In order to accurate measurement of diesel particle size and number concentration, the effects of major parameters were researched. Performance test of catalytic DPF(diesel particulate filter) and particle Size distribution by driving conditions were carried out. Test result for stabilization time and sampling tube temperature revealed that validity conditions arc over 10 minutes and 100˚C respectively. I<br/> the case of CDPF, more than 80% of PM and 99% of particle number were removed.<br/>
添加劑-스로틀링 再生에 의한 디젤 粒子狀物質 濾過裝置 性能評價에 관한 硏究
조강래(K.R.Cho),엄명도(M.D.Eom),유최호(J.H.You) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1994 No.11_1
This research has been proceeded from 1991 to 1993 to develop locally suitable trap system to fit Korean vehicle and characteristics by using fuel additive and throttling regeneration method. For this object diesel particulate trap with fuel additive and throttling technology was locally produced for which lab. test were carried out. For laboratory test the engine performance, gas emission, reduction rate of particulate, and regeneration performance including throttling and bypass rate were analyzed. And actual road performance and durability for locally produced sample are tested in vehicle road test On the results of lab. and on-road test no significant engine performance and fuel consumption has been varied and the smoke is reduced by maximum 92% after particulate trap system applied. Also fuel additive concentration of 150ppm is confirmed to be proper concentration for higher durability of trap system.<br/>
류정호(J.H.You),엄명도(M.D.Eom),김태승(T.S.Kim),임철수(C.S.Lim),정일록(I.R.Chung) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Diesel engines which emit a lot of PM and NOx have been known as a main air polluter. In order to reduce the exhaust emission from diesel engines, it is necessary to prepare a comprehensive management plan for emissions from diesel vehicles. Development strategies for low emission diesel vehicles was studied and emission reduction characteristics for s ∞ t, PM and HAP were evaluated. In addition, the emission characteristics according to particle size as well as aftertreatment equipments were an 허 yzed. Performance tests have been carried out for 9 diesel aftertreatment equipments. which are supplied domestically /intemationally an ψ or are under development. In the case of DPF, more than 89% of soot and 70% of PM were removed and plasma system was shown to remove 61% of soot and 36% of PM. In the case of diesel oxidation catalysts, removal efficiency for CO and THC was over 50%, but about 10% for PM
최낙정(N.J.Choi),로스리(Rosli),엄명도(M.D.Eom),이창식(C.S.Lee) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1
This study investigates the characteristics of transient response in a turbocharged diesel engine by using the computer simulation with experiments.<br/> Experimental study on the engine system is carried out to examine the validity of numerical analysis, and the predicted results are compared with experimental data at various conditions.<br/> Further, experiment for improving the low speed torque and acceleration performance is also performed by means of injecting air in the inlet manifold.<br/> The effects of air injection on the response performance are investigated at various conditions such as injection pressure, injection period, accelerating rate and engine speed.<br/>
운행중인 승용차의 공연비 변화에 따른 배출가스 특성에 관한 실험적 연구
김종춘(J. C. Kim),한영출(Y. C. Han),엄명도(M. D. Eom),강호인(H. I. Kang) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
In gasoline engine, it is well known that the combustion mechanism is spark-ignition by mixing the air and fuel. The change of excess air ratio causes to the change of combustion conditions, the exhaust emissions are changing as a result. In this study the characteristics of exhaust emissions for in-use passenger cars (gasoline and LPG) were investigated by changing the execss air ratio. The excess air ratio and exhaust emissions were measured at idling state(emission measurement method for in-use vehicles in Korea) as well as fast idling state (measures at 2500rpm, used in U.S.A) and common exhaust emissions such as CO. CO₂ HC and O₂ were analyzed.<br/>