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Document Title WLTP Annex 4 and 7, Delta Cd*Af: Alternative Cd*Af determination methods
Reference Number WLTP-08-21
Date
5 Nov 2014
Source(s) BMW
Rulemaking Area(s) GTR No. 15 WLTP
Meeting(s)
Downloads
UNECE server .pptx format
Excerpts from session reports related to this document
WLTP | Session 8 | 18-20 Nov 2014

#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.