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볼 베어링 터보차져를 적용시 디젤엔진 성능 특성에 관한 연구
엄명도(Myung Do Eom),김문석(Moon Suck Kim),백두성(Doo Sung Baik) 한국자동차공학회 2010 한국 자동차공학회논문집 Vol.18 No.4
Turbocharger in the application to a diesel engine was widely used in automobile industries for the improvement of engine performance. To comply with stringent emission standards, ball bearing turbocharger has been developed by applying new emission reduction technology. Up to date turbocharger has been proved as an essential part of diesel engines by demonstrating its improved engine performance, fuel efficiency and reduced emission as well. In this research, the performance of the ball bearing turbocharger was compared by the conventional journal bearing type turbocharger. The results shows that ball baring turbocharger was proved to be 10~13% higher fuel efficiency and 30% less average emission than journal bearing turbocharger.
박준홍 ( Jun Hong Park ),엄명도 ( Myung Do Eom ),김선문 ( Sun Moon Kim ),길지훈 ( Ji Hoon Kil ),강건우 ( Gun Woo Kang ) 한국액체미립화학회 2014 한국액체미립화학회 학술강연회 논문집 Vol.2014 No.-
As the improvement of emission reduction system, pollutant emissions from vehicles have been dramatically decreased in certification tests. After-treatment systems have been applied but it is known that the systems have quite different emission reduction efficiency as cold and hot engine conditions. To correlate emissions measured in certification test with those in real-driving conditions, it is required to assess the characteristics in cold and hot engine conditions. In this study, comparison and analysis have been conducted with the test results of cold and hot start phases in FTP-75, categorizing vehicles with fuel types as MPI gasoline, GDI gasoline, LPG and diesel. GDI gasoline vehicles have shown the highest difference of hydrocarbon emissions between hot and cold engine conditions, NOx emissions from diesel vehicles in hot start conditions are not significantly different in cold start conditions. CO2 emissions in cold start conditions are about 20% higher than those in hot start conditions.
연료분무 및 연소 2 : 운행차의 정밀검사 배출가스 NOx 에 관한 연구
김의중 ( Euijung Kim ),김형준 ( Hyung Jun Kim ),엄명도 ( Myung-do Eom ),이재윤 ( Jaeyoon Lee ),김지나 ( Jina Kim ),조강래 ( Kang Rae Cho ),이창식 ( Chank Sik Lee ),노현구 ( Hyun Gu Roh ),김정수 ( Jeong-soo Kim ) 한국액체미립화학회 2015 한국액체미립화학회 학술강연회 논문집 Vol.2015 No.-
This paper described a study on diagnostics exhaust gas NOx of In-use Vehicle. We used KD-147, PEMS for NOx testing equipments, we checked car’s exhaust gases in real time by these equipmants. Among the rest we analyzed NOx. As a result we assured that exhaust gas is decreased gradually but NOx is rapidly increased after 2005.
국내 휘발유 승용차의 CO<sub>2</sub> 배출 현황
유영숙,류정호,정성운,전민선,김대욱,엄명도,김종춘,Lyu, Young-Sook,Ryu, Jung-Ho,Jung, Sung-Woon,Jeon, Min-Seon,Kim, Dae-Wook,Eom, Myung-Do,Kim, Jong-Choon 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.2
As the concerns regarding global worming were increased, the pressure of greenhouse gas(GHG) emission reduction on mobile source was also increased. Carbon dioxides contribute over 90% of total GHG emission and the mobile source occupies about 20% of this $CO_2$ emission. Therefore automotive exhaust is suspected to be one of the major reasons of the rapid increase in greenhouse effect gases in ambient air. In this study, in order to investigate $CO_2$ emission characteristics from gasoline passenger cars(PC), which is the most dominant vehicle type in Korea, 106 vehicles were tested on the chassis dynamometer. $CO_2$ emissions and fuel efficiency were measured. The emission characteristics by displacement, gross vehicle weight, vehicle speed and CVS-75/vehicle speed mode were discussed. Test modes were vehicle speed modes and CVS-75 mode that have been used to develop emission factors and to regulate for light-duty vehicle in Korea. It was found that $CO_2$ emissions showed higher large displacement, heavy gross vehicle weight, low vehicle speed and CVS-75 mode than small displacement, light gross vehicle weight, high vehicle speed and vehicle speed mode, respectively. From these results, correlation between $CO_2$ emission and fuel efficiency was also determined. The results of this study will contribute to domestic greenhouse gas emissions calculation and making the national policy for climate change.