WLTP-08-11
WLTP use of the gearbox: required data (Open issue item 6)
Source(s)
Date
4 Nov 2014
Status
Subject
Meeting(s)

Open issue 6 “Use of the gearbox, required data” concerns the following:

  • modification of the definition of nmin_drive to make it more appropriate for modern engines and to make manipulations more difficult.
  • Addition of nmax to section 2 and amendment of required data because the current definition is not appropriate for low powered vehicles.
  • Replacement of Pnormwot(nnorm i, j) in Section 2 (i) by Pwot(n i, j) because there is no need for the normalisation.
Downloads
UNECE server
Related documents
Excerpts from session reports
WLTP | Session 8 | 18-20 Nov 2014

#6: Annex 2, section 2, use of the gearbox, required data (WLTP-08-11e, WLTP-08-12e)
A modified description for nmin_drive and a modified definition for nmax were developed by the task force and presented for adoption. The 2 proposals were adopted by WLTP IWG.

For the amendment of definition of nmin_drive, the perspective was given to have a proposal ready for adoption for IWG meeting #10.

For the calculation of gear use if separate groups of transmission ratios are available, the proposal to base the gear use determination on the group normally used for on-road operation was adopted by WLTP IWG. The wording needs to be improved regarding “range” (B. Coleman, Drafting Coordinator).

Definition of exception of crawler gears in current gtr was discussed in TF without conclusion. Timeframe was extended to IWG meeting #10.

New and Upcoming
System Pages
Regulations
Working Groups
GlobalAutoRegs
© 2026 GlobalAutoRegs