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EC spotlight on real world emissions

EC spotlight on real world emissions

The European Commission has published its Joint Research Centre assessment of the impact that the new WLTP test cycle will have on European car fleet CO2 emissions. Some really interesting summary findings of what the shift from NEDC will mean for 'real-world emissions'.
  • The fleet-wide, sales weighted average ratio between WLTP and NEDC officially reported CO2 emissions for conventional passenger cars for year 2015 fleet composition was estimated to be 1.21.
  • The WLTP/NEDC ratio decreases as the NEDC CO2 value increases. This ratio becomes around 1 at values of approximately 250 gCO2/km in NEDC.
  • A slightly higher ratio between WLTP and NEDC is observed for gasoline vehicles as compared to diesel ones, while there is a decreasing trend in the ratio with increasing mass, capacity, or power of the vehicle.
  • Results for Light-Commercial Vehicles are expected to follow the same trend as passenger cars. However the WLTP to NEDC ratios resulting from the calculations seem overall higher than those derived for passenger cars (especially for diesel vehicles, which however represent the vast majority of the fleet of light-commercial vehicles)
  • Battery electric vehicles, fuel cell vehicles and hybrid vehicles show slightly higher WLTP/NEDC ratios than ICEVs and for BEVs and FCVs the dependency of the ratio from the size of the vehicle is less pronounced and opposite in sign, with bigger vehicles experiencing slightly higher ratios).
  • Different considerations hold for plug-in hybrid vehicles instead. Due to the difference in the two procedures (NEDC & WLTP) for calculating the final CO2 emissions, after several analyses it resulted that the WLTP to NEDC ratio will quickly decrease as the size of the vehicle batteries will increase. Given the uncertainty in the market evolution, in the present report it was considered appropriate to assume that in the coming years the WLTP CO2 emissions for plug-in hybrid vehicles will be very close to the NEDC ones.
 http://publications.jrc.ec.europa.eu/repository/bitstream/JRC107662/kjna28724enn.pdf