http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
[가솔린엔진부문] 냉시동시 미연 배기가스 점화 기술이 촉매 온도 상승 및 분포에 미치는 영향
조용석(Yongseok Cho),엄인용(Inyong Ohm),김인탁(Intak Kim),김충식(Choongsik Kim),최진욱(Jinwook Choi),천준영(Junyoung Chun) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To make close-coupled catalytic converter (CCC) reach light-off temperature within a few seconds after cold-start, UEGI technology was developed to warm up the CCC. The unburned exhaust mixture is ignited by four glow plugs installed upstream of the catalyst. To verify the temperature rise effect by UEGI technology, CCC temperature distribution was measured with thermocouples. The results con finned that UEGI system makes easier for CCC to reach light-off temperature and shortens light-off time. The results also showed that UEGI system doesn't affect CCC temperature distribution so much, but the shape of exhaust manifold strongly affects the temperature distribution.
[가솔린엔진부문] UEGI 기술을 이용한 촉매온도제어에 관한 연구
조용석(Yongseok Cho),이윤석(Yunseok Lee),김충식(Choongsik Kim),최진욱(Jinwook Choi),천준영(Junyoung Chun) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Reduction of catalyst light-off time in the cold start period is crucial to reduce the HC and CO emissions and to meet the ULEV emission regulation. In this study, a new approach to solve this problem has been studied experimentally. The UEGI (Unburned Exhaust Gas Ignition) technology developed in this study ignites the unburned fuel-air mixture at the exhaust manifold to warmup a CCC (Close-coupled Catalytic Converter) during cold start. The experimental results showed that the UEGI technology can effectively shorten the catalyst light-off time and reduce the HC and CO emissions.
조용석(YongSeok Cho),엄인용(InYong Ohm),이윤석(YoonSeok Lee),김득상(DukSang Kim),김충식(ChoongSik Kim),천준영(JunYoung Chun),최진욱(JinWook Choi) 한국자동차공학회 2001 한국 자동차공학회논문집 Vol.9 No.2
In order to satisfy the ULEV emissions regulation, fast light-off of a catalyst is essential for reduction of HC and CO emissions during the cold start. Cranking Exhaust Gas Ignition (CEGI) method developed in this study showed that the catalyst reaches the light-off temperature in a few seconds. The CEGI stops the ignition signal for a few seconds during the cranking period, so the unburned fuel-air mixture bypasses the combustion chamber and flows through the exhaust manifold. When the unburned mixture reaches two glow plugs installed upstream of the catalyst, it burns and releases the thermal energy to heat up the catalyst. In the FTP-75 vehicle tests, the CEGI showed that the exhaust emissions reduced by 47.7% for THC and by 88.6% for CO in the cold-transient phase of the test.
[가솔린엔진부문] 냉시동시 미연 배기가스 점화 기술을 이용한 배기저감
조용석(Yongseok Cho),김충식(Choongsik Kim),최진욱(Jinwook Choi),천준영(Junyoung Chun),김인탁(Intak Kim) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To alleviate the problems of air pollution caused by vehicles, many researchers are trying to develop new emission reduction technologies. In this study, UEGI technology was developed to help three way catalyst's fast light-off. A HC adsorber was applied to UEGI system to improve emission reduction perfo그ance of the system. Experimental results showed that closed-coupled catalyst's light-off time and HC and CO emissions are significantly more reduced by UEGI technology with the HC adsorber. There were 50.8% reduction of THC and 94.4% reduction of CO by the UEGI system, and 78.1% of THC and 96.6% of CO were reduced by the UEGI system with the HC adsorber
분사방식에 따른 단실린더 수소기관 성능 및 배출가스 특성에 관한 연구
조인억(Ineok Cho),박경균(Kyounggyun Park),이성욱(Seangwock Lee),조용석(Yongseok Cho),오상기(Sangki Oh),백두성(Doosung Baik),엄명도(Myoungdo Eom) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
As an alternative energy in future hydrogen has been attracted since it might be a long-term solution to the limited global fossil energy. In particular, in automobile industries the technology of hydrogen fueled engine can bridge hybrid or fuel cell vehicles, and hydrogen fuel gives merits in wide ranges of combustion, improved thermal efficiency, close to zero harmful emissions except NOx and improved compression ratio by a higher octane number of hydrogen fuel itself. Despite many researches have conducted actively on the technique of directly injected hydrogen fuel rather than a pre-mixed type in order to reduce emissions and improve a power and response of combustion control, so far there are few comparison study on the performance and emission characteristics among direct injection and pre-mixed hydrogen engines and gasoline engines. This research aims to provide fundamentals of performance and emission characteristics between direct injection and pre-mixed type hydrogen engines comparing with gasoline engines, and may contribute in the development of a hydrogen engine in future.
C.V.C 내 수소-LPG 혼소 비율에 따른 연소 및 배출가스 특성에 관한 실험적 연구
김기종(Kijong Kim),조용석(Yongseok Cho),이성욱(Seangwock Lee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Finding an alternative fuel and reducing environmental pollution are the main goals for future internal combustion engines. The purpose of this study is to obtain low-emission and high-efficiency by hydrogen enriched LPG fuel in constant volume chamber. An experimental study was carried out to obtain fundamental data for the combustion and emission characteristics of pre-mixed hydrogen and LPG in a constant volume chamber (CVC) with various fractions of hydrogen-LPG blends. To maintain equal heating value of fuel blend, the amount of LPG was decreased as hydrogen was gradually added. Exhaust emissions were measured using a HORIBA exhaust gas analyzer for various fractions of hydrogen-LPG blends. The results showed that the rapid combustion duration was shortened, and the rate of heat release elevated as the hydrogen fraction in the fuel blend was increased. Moreover, the maximum mean gas temperature and the maximum rate of pressure rise also increased. These phenomena were attributed to the burning velocity which increased exponentially with the increased hydrogen fraction in the H₂-LPG fuel blend. Exhaust HC and CO₂ concentrations decreased, while NO<SUB>X</SUB> emission increased with an increase in the hydrogen fraction in the fuel blend. Our results could facilitate the application of hydrogen and LPG as a fuel in the current fossil hydrocarbon-based economy and the strict emission regulations in internal combustion engines.