12. Families: Parent engine should be compliant with emissions limits and not more relaxed than the most stringent requirements. It sometimes is difficult to find a Euro VI-compliant engine that is performing within the emission limits and conversions must take this into account.

13. Mr. Dekker reminded the group that we are discussing ‘system’ type approval and not necessarily approval of an ‘engine’ type. Mr. Renaudin (Volvo) indicated that this needs to be discussed in more detail. Durability testing could give local authorities confidence that these engines are compliant with the regulations.

14. Mr. Rijnders emphasized the need to set stringent levels for retrofit systems but not so difficult that it is impossible to fulfill. This is the balance that will have to be found and durability might be one of the ways to deal with these requirements.

15. Approval: Retrofit systems versus retrofit engines will be discussed.

16. An Open Issues List was created at GFV 29 (see GFV-29-09) to help the group work through some of the most challenging issues. This document is updated by GFV 30-04.

34. Mr. Rijnders showed the latest version of the Open Issues List (OIL). (See new document (GFV 30-04, based on GFV 29-09). Issues dealt with include: 1) We take on Euro IV and V but Euro VI will be pending; dual-fuel Type B will be addressed with no
distinction between system types 1,2, and 3;

35. Mr. Renaudin felt that maybe Type 3 engines should not be included in the regulation. Mr. Dekker felt that with engine type approval having Type 3 as fine for diesel operation fulfilling diesel requirements in the engine family requirements. At this moment customers want to convert from diesel for economic reasons and not so much for environmental reasons, therefore, governments may not want to support such conversions.

36. Mr. Rijnders suggested the solution is to remove Type 3 dual-fuel from the regulation. The group has no objections to this. The OIL will be changed to reflect the new decision.

37. Other issues from the OIL chart: 1) Compliance with emissions limits and retrofit system approval have been agreed. 2) Approval of a retrofit engine and retrofit vehicle is pending for further discussion. 3) In-Service Conformity is an open issue. Conformity of Production (COP) will be a new item added to the chart. Reliability and responsibility of converted vehicle: will be added to the chart for further discussion. OBD: an issue for further discussion.

38. Mr. Rijnders asked the group to consider the Open Issues List carefully and inform him of any additions, changes or preferences in the OIL. Mr. Renaudin suggested that NOx control should be added as an issue for discussion (Euro V). He added that this will be a ‘living document’ that will gain importance in upcoming meetings to deal with these difficult issues that need further discussion.