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State-of-the-art diesel passenger vehicles are increasing every year. However, NOx emissions from diesel vehicles are currently an important issue. The reason is that the certification test does not sufficiently reflect the actual driving conditions and various driving patterns. Therefore, the European Commission and the Ministry of Environment of Korea have introduced the real driving emissions-light duty vehicle(RDE-LDV) with PEMS and world-harmonized light-duty vehicle test cycle(WLTC), which includes higher loads and acceleration than the New European Driving Cycle(NEDC). In this study, the evaluation method for the application of the weighing factor under extended condition and characteristics of NOx emission in 3rd RDE package have been studied. The NOx emissions were highly measured because the lower ambient temperature results in a nonoperational EGR valve rate. Furthermore, the evaluation method according to the application of the weighing factor using interpolation seems reasonable.

A Study of Cold-start and Evaluation Method for Real Driving Emissions of Diesel Light-duty Vehicle