ENTERPRISE AND INDUSTRY DIRECTORATE-GENERAL
Industrial Innovation and Mobility Industries
Automotive industry
Brussels, 01 August 2012
ENTR.F1/KS
Euro 6 evaporative emissions, audio/web conference of 30 July 2012: next steps
The JRC and Emisia were presenting an improved methodology for estimating the effects of 3 scenarios for future Euro 6 evaporative emission requirements/tests.
The model has been calibrated against the experimental data from the Swedish (and German) in-service programmes. In short, the following modifications have been introduced compared to the previous calculations:
-Carbon degradation has been adjusted. Different values have been introduced for small, medium and large cars. In general, small cars seem to be equipped with low quality carbon and hence a 1% degradation every 8000km (20% over vehicle lifetime) was introduced. The respective values for medium and large cars are 1% every 32000km (5% over vehicle lifetime). These values are worse than non-ethanol containing fuels, hence there is indeed additional degradation due to ethanol.
-It has been assumed that medium and large cars have a higher purge rate compared to small cars. This is confirmed by experimental data where purge volumes were measured over various driving cycles.
-Emissions due to leakage have been somewhat reduced (from ~0.3 grams to ~0.2 grams).
The presentation as well as an Excel sheet with the resulting evaporative emissions for 4 European countries (DE, FR, IT & SE) for the different scenarios are available on Circa. Stakeholders are requested to comment on the methodology used until 7 September 2012. Consolidated comments should be discussed in an audio/web conference of 13 September with a view to present results for all EU Member States at a face-to-face meeting of the Euro 6 evaporative emissions working group of 25 September (NB change of scheduled date).
JAMA also gave a presentation of their views and recommendations for the process, which is also available on Circa and can be commented. At the audio/web conference of 13 September JAMA intends to provide more information on the introduction of evaporative emission control technology, which is "ethanol fuel compatible".
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