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| Document Title | Proposal to amend document GRPE/2012/6/Rev.1 | ||||||||
| Reference Number | GFV-22-02 | ||||||||
| Date |
15 Oct 2012
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| Summary | Documents GRPE-63-05/Rev.1 and GRPE/2012/6/Rev.1 propose to redefine the class of bi-fuel vehicles to permit the simultaneous use of gas and petrol in gas mode in UN Regulation No. 83. CLEPA proposes an alternative method to the weighing procedure of the fuel consumption test procedure. | ||||||||
| Source(s) | CLEPA | ||||||||
| Rulemaking Area(s) | UN R83 Motor Vehicle Emissions | ||||||||
| Meeting(s) | |||||||||
| Downloads | |||||||||
| UNECE server | .pdf format | ||||||||
| Excerpts from session reports related to this document | |||||||||
| GFV | Session 22 | 2 Oct 2012 |
16. Mr. Rijnders informed the group that the changes to Regulation 83 and Regulation 115 were approved by the GRPE. The Technical Committee for Motor Vehicles (TCMV) in Brussels will vote on this regulation next week to mandate the Commission to vote positively in WP.29 in November 2012. 17. The new proposal tabled by CLEPA (GFV-22-02) represents an updated version of the document GFV-20-03 that was presented by Harry Scheule (Continental/CLEPA) and discussed at the last GFV in Bologna, 14-15 May 2012. Winfried Langer (CLEPA/Bosch) introduced the new document: since the weighing-of-gas-tank procedure, which the current amendments are based on, may, from CLEPA’s viewpoint, raise practical and safety problems during development and type approval. An alternative method is proposed for the identification of gas fuel mass as calculated by the ECU, making use of the injection time and flow rate through the fuel injectors, 18. Ms. Leifheit (ACEA/VW) said that she has not had a chance to check this alternative approach with her colleagues. She would have preferred to see the document earlier, therefore, they cannot make any comments but it looks very promising. 19. Mr. Del Alamo (NGVAE) also indicates that the document looks very good but that some more time is needed to review the proposal. 20. Mr. Piccolo (AEGPL) agrees that, even if based on proprietary data, the use of ECU outputs is undoubtedly more ‘elegant’ than the weighing procedure, and, if accepted by the authorities, it would be a valuable alternative to gas tank weighing, that could still be the method in the event of a dispute. 21. Mr. Dekker sees some potential problems regarding 2% accuracy measuring CO2. The 2% error in CO2 can mean a 10% error in petrol consumption in percentage. The proposed validation procedure of ECU data needs further investigation and, furthermore, a detailed legal text about this process must be included in the regulation. The advantage of the weighing method is that it can be checked. So, additional work has to be done to get a consistent proposal. 22. As regards the errors, Mr. Langer points out that 2% error in the petrol mass would imply a 2% error in the CO2 by calculation. 23. Mr. Rijnders understands that the work of the OEM can be accurate, but from the regulator’s view as a type approval procedure they have to be able to check. 24. Mr. Rijnders indicates that we must wait for OICA/ACEA’s response. He suggests that by December the GFV members should make comments in a written paper so the issue can be discussed again in January 2013. He asks CLEPA to prepare in detail, in the next two-three weeks, two informal documents (both R. 83 and R. 115) for the GRPE January 2013 session, possibly taking into account the comments expressed today. These informal documents will be sent to the GFV members before the end of October for consideration. Deadline for comments from GFV members must be provided by the end of November/early December Thereafter CLEPA will try to revise their proposals in accordance with the collected comments. If needed, a possible telephone conference can be arranged in December among GFV members in advance of the January 2013 GFV. Otherwise, the final drafts will be dealt with directly in the January 2013 GFV. |
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