A Comparison of Tailpipe Gaseous Emissions for RDE and WLTC Using SI and Hybrid Passenger Cars

Paper #:
  • 2017-01-2391

  • 2017-10-08
Real world driving emissions have become an ever increasing problem in urban areas, particularly in some mega cities. In this paper, eight in-use spark ignition gasoline-fueled and hybrid passenger cars were tested for real driving emissions (RDE). The vehicles tested include both European and Japanese makes, spanning from EURO 5 to EURO 6 emission compliance. During the RDE testing, the vehicles’ emissions were logged alongside their driving and operational parameters, such as exhaust flow rate and temperature, using the vehicles’ OBD systems. The RDE cycles are comprised of 33% urban, 33% rural and 34% motorway driving, of total duration approximately 1.5 hours. The RDE testing was performed in Beijing, China, using the Horiba OBS-ONE Gas and Horiba OBS-ONE PN equipment for six of the RDE tests, and the AVL M.O.V.E equipment for two of the RDE tests. In addition, standard WLTC (World Harmonized Light-duty vehicle Test Cycle) tests were performed on the same set of vehicles, allowing a comparison of emissions between RDE and WLTC results. Preliminary analyses indicate that emissions from the RDE cycles fluctuated both negatively and positively against the WLTC results. The percentage difference between average CO2 masses per kilometer for the two test cycles varied between -35% and 10%, while that for CO varied between -91% and 79% and that for NOx, between -237% and 47%.
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