http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
김준우(Joonwoo Kim),전준홍(Junhong Jeon),김은석(Eunseok Kim),나승철(Seungchul Na),한현식(Hyun-Sik Han) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
A demand of diesel engine continuously increase because has benefits that is higher efficiency and lower CO₂ emission than gasoline engine. The diesel oxidation catalyst (DOC) is a widely used device to reduce harmful species of exhaust gas with less engine back pressure. DOCs promote chemical oxidation of carbon monoxide and hydrocarbon, also oxidize sulfur dioxide which is present in diesel exhaust from the combustion of sulfur containing fuel. The DOC might be not free from S compound in emerging countries using high sulfur contents. So those are to improve of S tolerance for durability due to deactivate by sulfur. The prepared DOC using various design factors is evaluated to oxidation performance at model gas reactor (MGR) and vehicle. Among of them, catalyst which is controlled wash-coat loading amount has a good S tolerance and CO removal activity.
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.