Progress report (WLTP-08-17-rev1e) was given on RLD issues (#10 – 21), incl. outcome of validation exercises, by TF Coordinator R. Cuelenaere

#11: onboard anemometry / wind conditions
No progress due to outstanding validation program. Program indicated by US/EPA, but no concrete information available, no assessment in TF possible. Conclusion of WLTP IWG: Wind condition criteria will stay unchanged in current gtr.

TNO will assess the need of improved specifications for the on-board measurement technology and report at IWG meeting#9. Decision to keep onboard anemometry in the gtr or not will be based on assessment from TNO and on further input from automotive industry, especially Ford.

#13-15: Torque meter method
Torque meter test results and initial gtr proposals will be presented by Ford in IWG meeting 9.

Starting note on tyre selection:
Presentation by K. Steininger (WLTP-08-18e). Proposal of EU-COM was discussed in the TF for Annex 4 without conclusion. Comprehensive information from ETRTO / tyre manufacturers regarding the distribution of rolling resistance values of aftermarket tyres within classes is still missing. Contracting Parties were not in a position to decide to add the issue to the open issue list of WLTP IWG or to reject it (means unchanged gtr provisions). Conclusion of WLTP IWG: RLD TF should not continue the discussions until the necessary data is available.

Independent from the EU COM proposal NL proposed that the gtr should reference to the ISO standard instead of R117 for determination of rolling resistance. NL (A. Rijnders) will provide a proposal for pre-discussion in the RLD TF and possible adoption at IWG meeting #9.

#1b_2: Concept for Road Load Family
WLTP-08-19e and an initial draft (WLTP-08-20e) were presented by Chr. Lueginger (OICA). Family concept was intensely discussed and in principle supported by WLTP IWG. Further development seems to be necessary. Approval will depend on results of validation (measurements are foreseen latest until mid 2015). Progress reports will be given continuously, adoption will be prepared for IWG meeting #12.

B. Coleman suggested renaming of “CO2-family” should be considered with reflection to pure EV. The term “CO2 family” is already blocked by some regional legislation, it should therefore be renamed. “Combined approach family” (or a similar term) would be more appropriate. Input is requested for IWG meeting #9.

#10: Use of Wind tunnel data for combined approach:
Alternative delta CD*A determination (WLTP-08-21e) was outlined by BMW. It was agreed by WLTP IWG that there is a justified need for an alternative determination method and the proposal should be further evaluated. Nevertheless WLTP IWG raised strong concerns regarding the current lack of specifications of simulation tools to ensure equivalency of the alternative determination method. Some basic parameters should be established. Constraints in regard to energy difference should also be considered. Concept will be rediscussed at IWG meeting #9.

#18: Use of wind tunnel + moving belt/dyno as alternative RLD method:
Status report by BMW (WLTP-08-22e) was presented. TF RLD prediscussed the proposal and supports the concept in principle. Work continues. Equipment and measurement method of moving belt dyno (WLTP-08-24e) were presented by Folko Rohde (VW) as basic principle.

India requested more detailed background information on the development of this new method in a form of a technical report. A more detailed progress report, incl. this background information, is expected by BMW in meeting #10, with a preview in meeting #9. It is also expected that the information will be given in the formal technical report which will be provided together with the GRPE working document for amendment of gtr No. 15. Initiative of Technical Gtr Sponsors (JPN, EC) is necessary.

UTAC presented comparison results (WLTP-08-23e) between coast down and windtunnel(WT)/chassdynamometer(CD) method. WT+CD offer a better repeatability & reproducibility than the track method. More data is expected from VW.

Initial gtr draft text of this new method was outlined (WLTP-08-25e) for wind tunnel and moving belt regarding procedure and equipment. Repeatability criteria have to be developed based on validation measurement results. Draft will be discussed further in detail in the task force and presented for confirmation in IWG meeting #10.

#17: Default road load parameters:
Explanation of hybrid approach (incl. extension of scope) was given by NL (WLTP-08-26e). Approach is necessary especially for multi-stage vehicles (MSV) and can be used as an option to full measurement or application of default road load values. WLTP IWG welcomed the initial proposal and requested to develop it further in the RLD TF. JPN had concerns to extend the scope of application to other vehicles than MSV, e.g. N1.. Based on the statements from other Contracting Parties, e.g. Germany / NL, it was agreed by WLTP IWG that the RLD TF should further investigate the possibility of scope extension. India requested that default road load values shall be based on real data. WLTP IWG asks RLD TF for clarification of validation needs and further steps for reporting in IWG meeting #9.

ACEA welcomed the NL proposal and gave a feedback (WLTP-08-27e). Additional coast down data and comparison to the adjusted default values are expected to be delivered by ACEA to RLD TF. The separate proposal to adapt the factor of “F0” in the current gtr formula should be further discussed in the RLD TF. ACEA also offered to provide a document which describes the EU concept of MSV as background information for other Contracting Parties. WLTP IWG agreed to postpone final discussion on default parameters to IWG meeting #10.

#12, #21 Definition of Reference speed points:
WLTP-08-28e was adopted by WLTP IWG. TF was thanked for the constructive way of working on an agreement. Draft will be given to the Drafting Coordinator.

#19: Proposal for alternative warm up procedure:
WLTP-08-29-rev1e was presented by T. Fujiwara. WLTP IWG agreed on the content and calls it adopted. T. Fujiwara & RLD TF should check whether the proposed wording needs editorial improvements. Final gtr wording will be provided by T. Fujiwara to the Drafting Coordinator before IWG meeting #9.