Mr Zardini/EC JRC provided an update on the Euro 5 Study

• After a Pre-Study (so-called Phase 0, completed) which was an input for the “real” Euro 5 Effect Study and after Phase 1 (Public Survey and Market statistics, completed) of the Euro 5 Effect Study, now the Effect Study is in its Phase 2 (Experimental work), the core of the Effect Study.
• The contractor who is carrying out Phase 2 is TNO+LAT+EMISIA, mainly hosted at JRC.
• Phase 0 and Phase 1 were instead carried out by JRC alone.
• Phase 0 report to be available next month, slide 5.
• Document EPPR-14-18 is part of phase 1 of the study; was not discussed in detail during the meeting as it is European oriented, but some hints/advice can be found useful for extra-EU Parties.
• PN:
  • Same methodology as the one used for passenger cars, as starting point. Not decided if this method will be used for L-cat, but taken as initial as reference. At the moment there is no discussion or plan to introduce any PN measurement for L-cat type approval. It’s an exploratory investigation.
  • JRC expected L-cat to be dirtier than passenger cars due to their simple after treatment technology and absence of particle filters but had not expected this to make such a difference: For mopeds, PN level is 3-20 times the PN limit set for passenger cars; for motorcycles, it is 2-4 times higher.
• The group exchanged comments.
• IMMA thanked JRC for the update on the study and asked for some clarification on the selection of vehicles used in the tests, and noted the importance to compare recent motorcycle models (Euro 4) when comparing the performance with the latest cars (Euro 6). Mr Zardini replied that their tests were with Euro 2 mopeds, and mainly with Euro 3 motorcycles as there were relatively few Euro 4 vehicles made available today.
• Mr Narusawa-san/Japan asked to clarify whether it was correct to say that 2-strokes was main reason for this high levels for mopeds.
• JRC clarified that not, all of them display high levels of PN. The quality of 2-strokers’ PN is anyway different than the one of 4-strokers (soft organic material condensed on the particles), which may lead to more artefacts (re-condensation).
• JRC reminded that 2-strokers emit high level of PN, because of the presence of the oil in fuel and because of the easy re-condensation of material inside the measurement system after the heating treatment. A lot of particles below 23 nm and also below 10 nm had been noted. Probably JRC will need some modification for the different categories which are going to be tested.
• Chair asked whether PN should be kept on the agenda of the group. Since there was no comment, the issue was left on the agenda for next meeting.