Drafting Coordinator Report WLTP-23-05e Drafting Coordinator Report IWG # 23 Geneva, June 2018

WLTP GTR Amendment 4 of GTR 15 was used as the benchmark GTR since the January 2018 GRPE meeting. That version is: GRPE-76-26r1e GTR 15 was amended at a number of places since January. These amendments are included in informal document WLTP-23-06e for this meeting. The following slides show open points.

WLTP GTR: II. Text of the global technical regulation, 3. Definitions DC was requested at IWG #21 in Ispra to come up with a definition of a "coastdown run". Since the term coastdown is in itself also not defined, it was attempted to define the terms coastdown, coastdown run and split run.

WLTP GTR: II. Text of the global technical regulation, 3. Definitions 3.2.31. "Coastdown" means a method to determine a vehicle's road load by freewheeling that vehicle, i.e. disconnected of its propulsion systems, from its highest reference speed point to the lowest reference speed point. This is a general definition which covers the optimum case where a stretch of road of infinite length is available. Comments/conclusion: Open point. To be discussed in a telco in late August.

WLTP GTR: II. Text of the global technical regulation, 3. Definitions 3.2.32. "Coastdown run" means a single coastdown in one direction on a test track.   Comments/conclusion: Open point. To be discussed in a telco in late August.

WLTP GTR: II. Text of the global technical regulation, 3. Definitions 3.2.33. "Split run" means a segment of a coastdown where a single continuous coastdown is not possible or desirable. Comments/conclusion: Open point. To be discussed in a telco in late August.

WLTP GTR: ANNEX 4 Road Load Paragraphs 4.1.1.1.1. (permissible wind conditions when using stationary anemometry) and 4.1.1.1.2. (permissible wind conditions when using on-board anemometry) where wind speed peaks should be identified over 2 consecutive seconds. See the next two slides. This was proposed during the March 2018 New Issues TF meeting in Paris and the use of "continuous" in both cases has yet to be confirmed. Conclusion at IWG #22 (Ispra) and IWG #23 (Geneva): Open point. Still under discussion in Japan. To be tabled at IWG #24 in Tokyo.

WLTP GTR: ANNEX 4 Road Load Paragraphs 4.1.1.1.1. (permissible wind conditions when using stationary anemometry): Conclusion at IWG #22 (Ispra) and IWG #23 (Geneva): Open point. Still under discussion in Japan. To be tabled at IWG #24 in Tokyo..

WLTP GTR: ANNEX 4 Road Load Paragraph 4.1.1.1.2. (permissible wind conditions when using on-board anemometry): Conclusion at IWG #22 (Ispra) and IWG #23 (Geneva): Open point. Still under discussion in Japan. To be tabled at IWG #24 in Tokyo.

WLTP GTR: Annex 4 Road Load Paragraph 4.5.5.2.1. If K1 is in Newtons, then the equation has an inconsistency in itss units. Closed point. The proposed modifications to the equationss in paragraphs 4.5.4., 4.5.5.1. 4.5.5.2.1., and 4.5.5.2.3. of Annex 4 were accepted.

WLTP GTR: Annex 5 Test Equipment It was requested during the March 2018 New Issues TF meeting in Paris that paragraph 3.3.5.3. in Annex 5 (CFV-CVS temperature sensor accuracy) be modified to increase the response time from 0.1 seconds to 1.0 second or less. Conclusion at IWG #23 and GRPE #77(Geneva): Accepted as GRPE/2018/18. Closed point.

WLTP GTR: Annex 5 Test Equipment The response time a UFM-type CVS (see paragraph 3.3.6.4.3. of Annex 5) may, however, remain at 0.1 seconds. Reason from L. Hill (Horiba): "I would not change the specification for the UFM-CVS (leave at 0.1 secs) While the sensitivity to temperature change in a CFV-CVS is inversely proportional to the square root of the absolute temperature, for a UFM-CVS it is inversely proportional to absolute temperature - which means it it more sensitive to temperature changes. We use that 0.1 second transducer in our ultra-sonic exhaust flow meters for this reason." Conclusion at IWG #23 (Geneva): Closed point. The subject is not considered to be controversial.

WLTP GTR The GTR including its track changes is uploaded on a regular basis to the UNECE server under: https://wiki.unece.org/display/trans/Latest+GTR+15 2018 Calendar The 2018 calendar is available for your reference under: https://wiki.unece.org/display/trans/WLTP+2018+calendar Should you plan any WLTP-related event for 2018, please send me a mail with (a) what the event is (f2f meeting, web), (b) when it is to take place, (c) starting and finishing time. The calendar will be updated and uploaded as soon as possible.

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