Agreed proposal of the Dual-Axis Dynamometer Taskforce submitted for approval by the WLTP informal group during its 21st (January 2018) session and inclusion in the draft Amendment 4 to GTR 15.

Materials supporting the extension of the work on Phase 2 items in the development of the light vehicle emissions GTR.

The light vehicle emissions GTR (WLTP) is being transposed into a UN Regulation. Given its complexity, the preferred approach is to draft a UN Regulation that would allow national/regional application with different stringency levels. The task force preparing the UN Regulation version of the GTR seeks IWVTA informal group input to understand issues that may impact the application of the light vehicle emissions regulation to whole vehicle type approvals.

Proposal of amendments to the light vehicle emissions GTR (WLTP) pursuant to the “phase 2” mandate of the WLTP informal group. This proposal is also available in a marked-up version with changes tracked in word and pdf formats.

Report on the development of Amendment 4 to GTR 15. Amendment 4 is part of the second phase development of the GTR mandated to:

1. Introduce definitions of response time, delay time and rise time harmonized with those in GTR Nos. 4 and 11
2. Introduce improvements to the gear shifting procedures
3. Ensure consistency in the use of the terms accuracy, precision, resolution, tolerance, repeatability and deviation
4. Address bi-fuel and bi-fuel gas vehicles in accordance with UN R83
5. Clearly define the appropriate positioning of payload mass (25 kg plus the mass of vehicle load)
6. Correct terminology such as “classes of rolling resistance coefficients”
7. Correct minor spelling and/or punctuation mistakes, and restructuring some paragraphs
8. orrect some equations and to make them all consistent with Word’s use of mathematical symbols
9. Exclude all Rechargeable Electric Energy Storage Systems (REESSs) that do not contribute to vehicle propulsion from monitoring
10. etter define the purity of certain gases such as nitrogen and synthetic air
11. Define more specifically the difference in mass of CO2 during charge sustaining between the test with the highest and lowest positive and negative electric energy charge

Presentation in favor of better defining the coastdown wind speed validation requirements of the current GTR:

• The cross wind requirements do not specify whether it should be applied to an average or peak measurement
• The procedure for calculating an average wind value is not adequately defined
• For on-board anemometry, the peak wind measurement is not specified with any filtering (only single point measurement) which may result in unnecessary test voids.

Appendix to the New Issues task force status report with draft text on the treatment of movable aerodynamic body parts under WLTP test procedures.

Consolidated text of the regulation, including Amendment 3, as developed by the Informal Working Group (IWG) on Worldwide harmonized Light vehicles Test Procedure (WLTP) under “Phase 2” of its mandate.

Proposal for next steps.

Proposal of an amendment to GTR 15 to:

1. clarify phase, cycle and vehicle class terminology to enable interpolation between different levels of downscaling, cycle classes and speed caps (resulting in modifications to WLTC cycle phases and time/speed tables),
2. improve the gear shifting procedures, including changes to gear selection and shift point determination for vehicles equipped with manual transmissions,
3. define the possible and permissible combinations of test vehicle selection and family requirements,
4. define the calculation of the average test mass during road load determination,
5. define single and double roller dynamometers, and
6. make editorial improvements.

Report on the development of Amendment 3 to GTR 15 on light vehicle emissions. The amendment aims to:

1. clarify phase, cycle and vehicle class terminology to enable interpolation between different levels of downscaling, cycle classes and speed caps (resulting in modifications to WLTC cycle phases and time/speed tables),
2. improve the gear shifting procedures, including changes to gear selection and shift point determination for vehicles equipped with manual transmissions,
3. define the possible and permissible combinations of test vehicle selection and family requirements,
4. define the calculation of the average test mass during road load determination,
5. define single and double roller dynamometers, and
6. make editorial improvements.

Presentation on the development of a testing cycle for fuel consumption/emission, including a national/regional CLTC (light-duty) and CHTC (heavy-duty), including new energy vehicles.

Updated proposal from the WLTP informal group incorporating GRPE/2017/9 and GRPE-75-22. Marked up versions of this revised document are available in pdf format and in docx format.

Proposal from the WLTP informal group for amendments to the formal proposal for Amendment 3 to GTR No. 15.