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http://dx.doi.org/10.5572/KOSAE.2015.31.6.562

Estimation of Real-Driving NOx Emission Characteristics from Light-Duty Diesel Vehicles with PEMS  

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)
Publication Information
Journal of Korean Society for Atmospheric Environment / v.31, no.6, 2015 , pp. 562-572 More about this Journal
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
Real-driving emission; $NO_x$; Diesel vehicle; PEMS (Portable Emission Measurement System); RDE-LDV (Real Driving Emission-Light Duty Vehicles);
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Times Cited By KSCI : 3  (Citation Analysis)
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