Evaluation of real driving emissions for Euro 6 light-duty diesel vehicles equipped with LNT and SCR on domestic sales in Korea

In general, recent certification procedure for regulatory emission limits is used to the standard test cycles in the laboratory under standardized operating conditions. But, it is proving that the real driving emissions (RDE) of vehicles highly exceed the standard emission limits. In order to tackle this problem, RDE regulation has been proposed with the Potable Emissions Measurement Systems (PEMS). In present study, the PEMS (Portable Emissions Measurement System) equipment, which consists of an exhaust gas flow meter, an exhaust gas sampling device, an exhaust gas analyzer, an OBD data acquisition device, GPS and ambient air sensors, and power supplying device, is installed on 17 test vehicles (Euro 6) sold in Korea currently. And two test driving routes (Route A and B) wider 3rd RDE package were developed to include Seoul into urban driving due to reflecting representative traffic and road conditions in Korea. In results, the average NO, emissions of most test vehicles approximately exceeded 6.6 times the emission limit on test routes. Additionally, the on-road NOx emissions of test vehicles by applying SCR during the same trip were not relatively different based on the ambient temperatures. With respect to most test vehicles, the CO2 emissions in the urban section are generally higher than those in the total trip.