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김동현(Donghyun Kim),한재욱(Jaeuk Han),임윤택(Yuntaek Lim),김은석(Eunsuk Kim),한현식(Hyun-sik Han) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
PM number regulations have been started from Euro-5b as well as aggressive environment regulation on vehicle emission. Therefore, It’s hard to meet both strict NOx emission and Particle Number in Euro-6 regulation. Moreover, exhaust gas temperature has been gradually decline to consider fuel efficiency engine in light duty diesel vehicle. Present DOC+DPF+SCR system will be difficult to comply with Euro-6 NOx emission on account of lower SCR inlet temperature. The temperature problems can potentially be solved by integrating the coated SCR into the DPF’s wall as one multifunctional catalysts. Basically, SCRoF has the role of Soot Filtering and NOx reduction as well as lower pressure drop. SCRoF has many advantages as follows .1.Low cost of total aftertreatment system with component reduction. 2.Improved cold start NOx reduction performance. This study focus on optimization of catalysts loading and process getting better NOx performance and Filtering rate. Vehicle test results satisfy the NOx emission and Particle Number regulation for Euro-6.
EURO-6 PN 규제 대응 GDI 엔진용 GPF 시스템 개발
김홍래(Hong-rae Kim),송진우(Jin-woo Song),한현식(Hyun-sik Han),윤기영(Ki-young Yoon),인치범(Chi-bum In) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Recently, the important issues of gasoline engine are fuel consumption and emission. So Gasoline Direct Injection (GDI) engines have been widely adopting for advantages in engine performance and fuel economy compared with MPI engine and it can be used effectively for downsizing while keeping the same or better engine performance. However, as a drawback the GDI engine raise the issue of Particulate Number (PN) emissions. In this study, new washcoat was designed specifically for GPF to achieve not only emissions (HC, CO, NOx) but also PN. GPF was replaced with the rear-brick TWC in Integrated Close-coupled Catalytic Converter (ICCC) with the same PGM amount and similar volume to suppress the increase of additional cost. Particle number of a GDI vehicle was measured by a CPC instrument during NEDC. As the result, GPF system showed better exhaust gases removal performance than TWC system and showed 85~90% PN filtration efficiency could meet the proposed Euro-6 PN regulation. However, GPF system increased significantly back pressure to reduce the advantages of GDI engine.
임승수(Seung-Soo Lim),김은석(Eun-Seok Kim),이태우(Tae-Woo Lee),한현식(Hyun-Sik Han) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
LNT has been considered as one of NOx reduction technologies for EURO6 regulations and is required to be optimized for the diesel passenger cars of which the exhaust gas temperature is expected to be lower than those of cars complying with the previous regulations. There are two major factors to be considered, increasing the NO conversion to NO2, which is likely to be stored on the storage site, at the temperature region as low as possible and trapping ability to the formed NO2 under the specific exhaust gas condition. And the desulfation characteristics is the another aspect of LNT to be addressed because of the fuel penalty resulting from the extra fuel consumption that is necessary to generate the fuel-rich high temperature environment. In this study, an optimization has been carried out to develop LNT catalyst for EURO-6 regulations in terms of PM-NSC interaction, NSC amount. Combining the optimization with the application of new NSC showed a significant improvement in the LNT performance such as NOx conversion, NOx storage capacity and desulfation characteristics.
DeNOx 활성 증진을 위한 HC-SCR 촉매 성분 최적화
김재우(Jae-woo Kim),이정배(Jeong-Bae Lee),김은석(Eun-Seok Kim),한현식(Hyun-sik Han) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
There are two catalytic DeNOx technologies which are being considered for the practical applications, urea-SCR and LNT. HC-SCR has been long investigated as the most convenient, but most challenging solution to debate NOx under oxidizing environment such as the exhaust gas from diesel engine. Recent observations in the exhaust gas from the state-of-art diesel engines have become a motivation to reconsider the HC-SCR technology as at least an auxiliary DeNOx solution. There are three types of HC-SCR catalysts, Cu/Zeolite, Ag/Alumina and Pt/Alumina that have drawn lots of attention according to their operating temperature window. Considering the temperature of diesel passenger car, the most plausible type seems precious metal-based catalysts that have a significant drawback of narrow temperature window. In this study, an optimization work has been carried out to expand the temperature window of precious metal ?based catalyst through combining the other components.