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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.
최승환(Seunghwan Choi),최선모(Sunmo Choi),정동수(Dongsoo Jeong),장영준(Youngjune Chang),Yasuo Moriyoshi 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A new gasoline internal combustion engine was designed and built by improving the cranking mechanism. Numerical simulations were also performed to optimize the cranking mechanism to achieve both a high compression ratio operation without knocking and a high thermal efficiency operation. As a result, a special cranking mechanism was considered to make a rapid piston motion near TDC, leading to less heat loss and also a tolerance for knocking limit. To evaluate this new concept, a leaf-shaped gear system was employed in a test engine. As a result, indicated thermal efficiency with the gear system in compression ratio of 12 was improved by 12% compared to a conventional engine with compression ratio of 10. Moreover, the exhaust gas emissions of HC and NOx were much reduced
전자 제어 연료 분사 방식의 4행정 50㏄급 소형 이륜차 엔진 개발
이용규(Yonggyu Lee),정영수(Youngsoo Jeong),강인호(Inho Kang),문건필(Gunfeel Moon),최교남(Kyonam Choi),정동수(Dongsoo Jeong) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
In recent years, the applied engineering solutions in small engines have been extended down to 50 ㏄ displacement engines to satisfy the more stringent emission regulation and increasing customer demands. The existing small engines, such as air-cooled 2 stroke or 4 stroke engines with carburetor system, have to enhance their mixture preparation and also have to call for the implementation of enhanced engine technologies into small engine category, which is as well known for automotive applications. In this paper, water-cooled 4 stroke 50 ㏄ small engine with electronic control fuel injection system were developed to enhance fuel economy and to meet EURO Ⅲ emission regulations. The engine power of 4 stroke with EMS was equivalent to 2 storke engines while the maximum torque increased due to extended engine speed. In the CVS 40 mode test, more than 50% enhancement of fuel consumption rate compared to carburetor system was obtained with lower emission level due to accurate closed loop air fuel ratio control.
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.
TIRE-LII를 이용한 확산화염에서의 매연입자크기에 관한 연구
김규보(Gyubo Kim),이종호(Jongho Lee),정동수(Dongsoo Jeong),전충환(Chunghwan Jeon),장영준(Youngjune Chang) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
Recently there is taking a growing interest in particulate matter emission because of new emission regulations, health awareness and environmental problems. It requires to improve particulate measurement techniques as well as to reduce soot emissions from combustion systems. Therefore, in this study, we report the results of measurement of soot particle size using time-resolved laser induced incandescence (TIRE-LII) technique in laminar ethylene diffusion flame. As an optical method, laser induced incandescence is useful to get the information for spatial and temporal soot volume fraction and size. Especially, TIRE-LII is able to measure soot particle size that is decided to solve the decay rate ofa S(t1) and S(t2) at two detection times. In laminar ethylene diffusion burner, visual flame height is 4㎝ from burner tip and measurement points are height of 15, 20, 27.5, 30 ㎜ above burner tip along radial direction. As higher form burner tip, particle size was increased to HAB=20㎜, decreased from HAB=27.5㎜ to 30㎜. this results shown growth and extinction processes for soot particles formed by combustion.