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SiC 필터를 사용하는 3L급 승용 디젤엔진용 DPF에서 배압을 이용한 매연포집량 예측에 대한 연구
최현하(Hyunha Choi),김홍석(Hongsuk Kim),안석종(Seokjong An),조규백(Gyubaek Cho),이진욱(Jinwook Lee),정용일(Youngil Jeong) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
It is important to know the accurate soot mass in a DPF to control when to start regeneration. The soot mass in a filter can be estimated by pressure drop of the filter and exhaust gas flow rates. In this study, a soot index is defined as a pressure drop of DPF devided by a pressure drop of DOC. This study suggests an effective signal processing method for the soot index and shows good correlation between the soot index and soot loading amount in the filter at both steady and transient engine operating conditions. This study uses a 3L diesel engine for passenger car.
DOC 장착시 전기히터/촉매 복합 재생방식 매연여과장치의 성능향상에 관한 연구
최현하(Hyunha Choi),김홍석(Hongsuk Kim),정용일(Youngil Jeong),임인혁(In-hyuk Im),황재원(Jae-Won Hwang) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
H-CDPF system regenerates the ceramic monolith filter both actively by an electrical heater and passively by a CDPF. The aim of this study is to compare the performance of the DOC coupled H-CDPF system with the DOC uncoupled H-CDPF system. In this study, the H-CDPF system was installed on the midium duty diesel engine of which already meets EURO-2 standards. The BPT of the DOC coupled H-CDPF system was about 40℃ lower than that of DOC uncoupled H-CDPF system. The DOC coupled H-CDPF system enhanced the active regeneration by the electrical heater at an idle engine condition. Also in the durability test which simulated actual city driving conditions, the DOC coupled H-CDPF system showed better regeneration characteristics.
촉매연소기를 이용한 소형 경유 운행차용 매연여과장치의 강제 재생 특성
김홍석(Hongsuk Kim),최현하(Hyunha Choi),조규백(Gyubaek Cho),정용일(Youngil Jeong),조성호(Sung-ho Cho),박종수(Jong-soo Park) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Light duty diesel vehicles are considered as one of major sources of particulate emissions in many cities, and the start of the retrofit program for the vehicles is expected in near future in Korea. One of the problems of the retrofit of the light duty diesel vehicles is that the exhaust gas temperature is too low to apply passive regeneration type DPF systems. This study introduces a new DPF regeneration technology using a catalytic combustor. This study shows the principle and characteristics of DPF regeneration by the catalytic combustor and suggests it's proper control method for better regeneration.
금속 폼 필터의 촉매 코팅에 따른 PM 저감 성능에 관한 연구
안석종(Seokjong An),조규백(Gyubaek Cho),최현하(Hyunha Choi),정용일(Youngil Jeong),이의성(Euisung Lee),오권오(Kwonoh Oh),한승한(Seunghan Han),김경재(Kyungjae Kim),박승룡(Seunglyong Park) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The air in cities has been heavily polluted by vehicle emissions. Above all, exhaust gases of diesel engines is the principal cause of these air pollutions. DOC is used to reduce harmful emissions, such as HC, CO and PM. But PM reduction rate of DOC is not enough. DPF is necessary to reduce PM and satisfy regulations. Metal foam is the one of promising materials in process on researches. Metal foam filter is available to use with catalytic coating. In case of catalytic metal foam, it reduce efficiency of PM reduction. In this study, we research the cause why efficiency of PM reduction is been worse and find out the most suitable condition.
Urea-SCR 후처리장치의 NO<SUB>x</SUB> 저감에 대한 해석적 연구
윤병규(Byoungkyu Yun),김종민(Chongmin Kim),김종훈(Jong Hun Kim),김만영(Man Young Kim),최현하(Hyunha Choi),조규백(Gyubaek Cho),김홍석(Hongsuk Kim),정용일(Youngil Jeong) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
During the past few years emission regulations have become more stringent as a result of increased environmental issue and energy saving. To meet stringent emission regulations, an diesel exhaust gas after-treatment system was developed such as DOC, DPF, and SCR. Various reduction devices of NOx in exhaust gas existed, such as LNT (Lean NOx Trap), HC-SCR and Urea-SCR. Especially, it is well known that the Urea-SCR system for diesel engine after-treatment is very effective device for reduction of NOx in exhaust gas among others. However, the Urea-SCR has disadvantage of low NOx reduction efficiency, especially in low temperature exhaust gas condition. Furthermore, this device have many issues associated with the Ammonia slip phenomenon, layout optimization for NOx reduction, etc. This study presents an optimized property of Urea-SCR system for NOx reduction by changing such various parameters as space velocity and length of the DOC with the numerical experiments.