Abstract
NOx emissions from diesel vehicles have been regarded as a main cause of high NO2 concentration in metropolitan area. Recent studies have shown that the on-road NOx 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 NOx 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 NOx 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 NOx emissions of diesel vehicles as applied emission technologies and can be a solution to remove discrepant NOx emissions between certification and Korean real-driving conditions. Among the NOx reduction technologies for EURO-6 diesel vehicles, selective catalytic reduction (SCR) system has shown the better performance than lean NOx trap (LNT) system to control on-road NOx emissions. Implementing RDE-LDV will require vehicle manufacturers to adopt the more effective NOx reduction technology in real driving conditions.
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