Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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Estimation of Real-Driving NOx Emission Characteristics from Light-Duty Diesel Vehicles with PEMS

PEMS를 이용한 소형 경유차의 실주행 NOx 배출특성 평가

  • Park, Yeon Jae (Environmental Transportation Division, Ministry of Environment) ;
  • Kwon, Sang Il (Transportation Pollution Research Center, National Institute of Environmental Research) ;
  • Park, Jun Hong (Transportation Pollution Research Center, National Institute of Environmental Research) ;
  • Lee, Jai Young (Department of Environmental Engineering, University of Seoul)
  • 박연재 (환경부 교통환경과) ;
  • 권상일 (국립환경과학원 교통환경연구소) ;
  • 박준홍 (국립환경과학원 교통환경연구소) ;
  • 이재영 (서울시립대학교 환경공학과)
  • Received : 2015.07.22
  • Accepted : 2015.10.05
  • Published : 2015.12.31
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Abstract

$NO_x$ emissions from diesel vehicles have been regarded as a main cause of high $NO_2$ concentration in metropolitan area. Recent studies have shown that the on-road $NO_x$ emissions of diesel vehicles are quite higher than the emission limits specified with the pre-defined test method for emission certification. To reduce air pollutants effectively, the discrepancy of emissions in certification and real-driving conditions should be tackled. In this study, the real-driving emissions have been estimated with portable emission measurement system (PEMS). The results of this study have shown that the on-road $NO_x$ emissions from diesel vehicles have been decreased as the introduction of stricter emission regulation, EURO-6, but additional reduction should be still required and robust technologies should be applied to control $NO_x$ in real-driving conditions. RDE-LDV (Real Driving Emission - Light Duty Vehicles) test method being developed in the European Union can represent excessive on-road $NO_x$ emissions of diesel vehicles as applied emission technologies and can be a solution to remove discrepant $NO_x$ emissions between certification and Korean real-driving conditions. Among the $NO_x$ reduction technologies for EURO-6 diesel vehicles, selective catalytic reduction (SCR) system has shown the better performance than lean $NO_x$ trap (LNT) system to control on-road $NO_x$ emissions. Implementing RDE-LDV will require vehicle manufacturers to adopt the more effective $NO_x$ reduction technology in real driving conditions.

Keywords

References

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