Technical Report on the development of a World-wide Worldwide harmonised Light duty driving Test Procedure (wltp)
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- 3.4.1Drafting GTR
3.4WLTP phase 1bAt the time that phase 1a was concluded, the main development on the test cycle and the test procedure had finished. This resulted in the first version of the GTR, which was published as official working document ECE/TRANS/WP.29/GRPE/2013/13 and a series of amendments published as informal document GRPE-67-04-Rev.1. Even though the main body of the GTR was now in place, still quite a number of open issues were yet to be resolved. Especially on the area of electrified vehicles a considerable effort was needed to finish the work on closing the open issues.
The former subdivision into subgroups DHC and DTP was abandoned, and only a few working groups. All activities in WLTP would from now on be managed by the WLTP-IG leading team. WLTP-IG leading team
The meetings of WLTP-IG were held in conjunction with the GRPE meetings that take place in Geneva every January and June. They were supplemented by meetings every fall and autumn to a total of 4 meetings per year. The first meeting was on 14 January of 2014 in Geneva, the last one is on 11-12 January 2016 in Geneva. Over that period, a total of 9 WLTP-IG meetings took place. For the subgroups and taskforces the same basic terms of reference as outlined in paragraph 3.3 were also applicable to the working groups in phase 1b. The scope of activity was dedicated to the issues covered by the tasks of the different subgroups and is further detailed in the next paragraphs. A separate activity is formed by the Round Robin tests, which were conducted during the course of phase 1b by OICA. The taskforces that were formed to deal with the open issues are listed and described in paragraph 3.4.5. All of the open issues addressed in phase 1b regarding the test cycle, gear shifting, downscaling etc. are reported separately. At the time that this report was published the update of the DHC report2 for phase 1b was not available. The main driving cycle related issues that were discussed and agreed during phase 1b are the following:
3.4.1Drafting GTR
The European Commission had offered to WLTP leading team to fund an expert as being the Drafting Coordinator (DC) for the GTR. The main objective of the DC would be to coordinate all drafting activities into a logically structured and technically, legislatively and grammatically robust technical regulation. To accomplish this objective, text, tables and figures resulting from decisions reached by various technical task forces and the IG were incorporated by the DC into the GTR. Technical gaps and inconsistencies were identified and either corrected or the responsible person(s) made aware of these. The DC participated in those task force, subgroup and IG meetings necessary for the processing of his task. Furthermore, the experts were occasionally contacted directly for any necessary clarifications. To support all participants, the GTR was uploaded on a regular basis to the UN ECE server in ‘tracked changes’ and clean versions. The ultimate goal was to have a complete and homogeneous technical regulation. In addition to the above, a Drafting Subgroup was founded in January 2015 to be led by the Drafting Coordinator in order to support him in developing the GTR. To achieve this, five drafting sessions were held in 2015 in the form of face-to-face meetings (Brussels in March, Stockholm in April, Brussels once again in June, and Tokyo in October) and an audio/web in September. In all of these sessions, the Drafting Coordinator prepared a collection of PowerPoint slides summarizing all open points and expert proposals which required clarification. In most cases, the open points and expert proposals were clarified during these meetings or were passed on to the IG for its consideration. The final GTR version at the end of phase 1b was uploaded to the UN-ECE website as formal document ECE/TRANS/WP.29/GRPE/2016/3, and is referred to as GTR no.15.9
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