배출허용기준 대응기술을 고려한 국내 소형 경유 운행차의 대기오염물질 관리 방안

• Published in: 한국대기환경학회지 Vol. 30; no. 4; pp. 327 - 338
• Main Authors: 이태우(Taewoo Lee), 박하나(Hana Park), 박준홍(Junhong Park), 전상진(Sangzin Jeon), 김정수(Jeongsoo Kim), 최광호(Kwangho Choi)
• Format: Journal Article
• Language: Korean
• Published: 한국대기환경학회 2014
• Subjects: In-use vehicles; Light-duty diesel vehicles; Inspection and Maintenance (I/M) Program; Diesel Particulate Filter (DPF); Soot; NOx; NO_x
• ISSN: 1598-7132; 2383-5346

The objective of this study is to enhance the effectiveness of Korean Inspection and Maintenance (I/M) program. Three main tasks are: to measure pollutant emissions of in-use light-duty diesel vehicles (LDVs); to evaluate the validity of existing smoke control scheme for low-smoke-emitting vehicles, which have diesel particulate filters, DPF, to meet stringent Euro-5 emission limits; and to assess the necessity and the benefit of $NO_x$ inspection, which is not involved in current I/M program. We measured second-by-second smoke, particulate and gaseous emissions of 27 LDVs using opacity smoke meter, photo-acoustic soot sensor, and portable emissions measurement system, respectively, under the Korean I/M test driving cycle, KD-147. We find that the DPF plays a key role in controlling soot, which can be considered as black carbon contained in particulate matter. Thus, from an I/M perspective, we believe smoke inspection strategies for Euro-5 diesel vehicles should be more focused on the capability of detecting DPF malfunctions or failures, in order to keep DPF properly functional. Fleet averaged distance-specific $NO_x$ emissions are consistently higher than corresponding emission limits, and the values are similar among pre-Euro-3, Euro-3, and Euro-4 vehicle fleets. These findings indicate that the $NO_x$ inspection should be incorporated into current I/M program in order to manage urban $NO_x$ emissions. This research allows the Korean I/M program keep pace with developments in vehicle technologies, as well as the increased emphasis on $NO_x$ with respect to air quality and human health.