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엔진 공회전과 시동 시 연비 및 배기가스 특성 비교연구
최교남(Kyonam Choi),조규백(Gyubaek Cho),정동수(Dongsoo Jeong) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
Only about 15% of total input fuel in engine could be contributed to the vehicle driving directly and others were<br/> consumed as loss such as heat, friction, and about 17% could be consumed in unnecessary idling.<br/> As stopping engine idling on stop or parking can save fuel consumption and emission reduction, advanced<br/> countries conduct anti-idling campaign and make idling regulation.<br/> In this paper, we have performed the experimental analysis about the effects of fuel consumption and emission<br/> reduction in case of engine idling and restarting conditions.
유로 5 디젤 버스와 CNG 버스의 연비 및 배출가스 측정 비교
김용래(Yongrae Kim),최교남(Kyonam Choi),정동수(Dongsoo Jeong) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
CNG buses have been spread instead of diesel buses in Korea due to the clean exhaust gas emission especially in terms of PM. But recently diesel engine technology has been improved dramatically and the emission regulation is also more stringent over the past ten years. Therefore the PM emission is almost near-zero level from diesel engines. In this study experimental validation was performed to confirm these backgrounds. Chassis dynamometer test is not the official test method yet in Korea but this test is more realistic to show the real-road condition. Both of the two buses have engines satisfied with Euro-5 emission regulation. From the two mode tests(Busan city mode and JE05 mode), each bus shows its advantage in terms of emission categories respectively but fuel economy of diesel bus is more efficient than that of CNG bus.
자동차용 LPG 펌프의 연료조건에 따른 성능특성에 관한 연구
박철웅(Cheolwoong Park),김창업(Changup Kim),최교남(Kyonam Choi) 대한기계학회 2008 大韓機械學會論文集B Vol.32 No.4
The need for more fuel-efficient and lower-emission vehicles has driven the technical development of alternative fuels such as Liquefied Petroleum Gas(LPG) which is able to meet the limits of better emission levels without many modifications to current engine design. LPG has a high vapor pressure and lower viscosity and surface tension than diesel and gasoline fuels. These different fuel characteristics make it difficult to apply it for the conventional gasoline or diesel fuel pump directly. In this study, experiments are performed to get performance and efficiency of the fuel pump at different condition as temperature, rotating speeds, composition of fuel. The characteristics of fuel pump is affected by cavitation due to the variation of temperature and composition.
자동차용 LPG 외장형 펌프의 연료 온도 및 조성에 따른 특성연구
남덕우(Deokwoo Nma),김창업(Changup Kim),최교남(Kyonam Choi),박철웅(Cheolwoong Park),임종한(Jonghan Lim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Recently, the regulation of exhausted gas becomes tightened from the friendly-environmental motor industry. LPG is alternative fuels of the government policy, and the LPG engines of good performance stand out. However, there are problems of dependance on the advanced technology from foreign countries and the maintenance of the LPG pump. For that reason, we are in the middle of developing an external pump which prominently stands out in price competitiveness and maintenance. In this study, the experiments used external fuel pump are carried out in order to get characteristic of the fuel pump at different fuel temperature and fuel compositon.
소형 가솔린 엔진의 VVT적용을 위한 엔진 성능 기초 연구
이승진(Seungjin Lee),류정인(Jeongin Ryu),최교남(Kyonam Choi),이용규(Yonggyu Lee),정동수(Dongsoo Jeong) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Due to wider operation engine speed range, from 3000 to 12,000 rpm, in small gasoline engine, EFI(Electronic fuel injection) with ECU and VVT (Variable Valve Timing) systems are necessary in order to increase engine performance. In Korea, both system are already adopted in automotive engines but are not in the engine for motorcycle. In this study, to check the applicability of VVT, various cams with different valve timings are tested in small single cylinder gasoline engines with EFI system. In oder to optimize valve timing with engine speed, intake valve opening timing is changed by every 5 CA deg with commercial cam. Compared to conventional valve timing in 4 valve SOHC single cylinder engine, 12% increase of engine power was obtained at low engine speed with 15° advanced IVO(intake valve opening) and 7% increase at high engine speed with 5° retarded IVO.