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

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.

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.

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.

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

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.

Questions from the EV subgroup concerning handling of rechargeable electrical energy storage systems (REESS) under the proposed Low Temperature Test Procedure.

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

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.

Documentation of the work of the EVE informal group on the development of an amendment to GTR No. 15 to establish a procedure for determining the powertrain performance of electrified vehicles.

Proposal for amendments to document WP.29/GRPE/2017/9 prepared by the WLTP informal group for submission to the GRPE June 2017 session.

Status of the various programs for the further development of the light vehicle emissions GTR.

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.

Discussion document considering approaches for the transposition of GTR No. 15 into a type-approval regulation appropriate for EU application.

This proposal is also available in versions with tracked changes: portable document format (.pdf) and Microsoft word format (.docx).

Adopted technical report on the development of draft Amendment 2 to global technical regulation No. 15 on Worldwide harmonized Light vehicles Test Procedures (WLTP).

Observation by Russia that the proposals to allow Contracting Parties to refuse to accept type approvals granted under UN R83 and/or R101 based upon application of GTR 15 (WLTP) runs counter to the provisions of Revision 3 to the 1958 Agreement.

WLTP informal working group refinements to the amendment proposal.

Complete version of GTR No. 15 including the proposed Amendment 2 (GRPE/2017/7) and latest refinements by the WLTP informal group (GRPE-74-02). Amendment 2 corresponds to phase 2a development of the GTR, including the following modification to the text:

1. If an alternative value is applied for a parameter, such as a higher n_min_drive or an ASM, this parameter value has to be the same within an interpolation family (Paragraph 5.6.1.).
2. The mass in running order used for the calculation of the power to mass ratio is replaced by mass in running order minus 75 kg (paragraph 1. of Annex 1).
3. Idle engine speed n_idle is removed from the power curve measurement requirement (paragraph 2. of Annex 2).
4. The additional safety margin (ASM) value may be decided by manufacturer rather than the prescribed exponential curve (paragraph 3.4. of Annex 4).
5. The number of decimal place of road load coefficients is defined (paragraph 2.4. of Annex 4).
6. Additional restrictions are set to the application of the split run method for coastdown testing (paragraph 4.3.1.3.4. of Annex 4).
7. Specific data rejection criteria are added (paragraph 4.3.1.4.3. of Annex 4).
8. The “delta method” for road load determination is added (paragraph 6.8. of Annex 4 and other paragraphs. See section 4.4.25.for more detail).
9. The roller radius correction factor is modified(paragraph 6.6.3. of Annex 4).
10. The allowable combination of the test vehicle selection and family requirements are further clarified (paragraph 4.2.1.3. of Annex 4 and other paragraphs of Annex 4).
11. Provisions for an additional cooling fan are included(paragraph 1.1.5. and 1.1.6. of Annex 5).
12. The correction of measurement/recording frequency requirements are specified (over several annexes).
13. Calculation of the n/v ratio is defined (paragraph 8. of Annex 7).
14. The stepwise procedure for calculating the final test results of OVC-HEVs is added (paragraph 4.6. of Annex 8).

European Commission report on the effort to transpose the GTR on light vehicle emissions into UN type approval regulations, including handling of current UN Regulations on emissions (notably, UN R83 and UN R101) and process for implementing the WLTP requirements.

The subject documents would permit Contracting Parties applying UN R83 and/or UN R101 and which have transposed GTR No. 15 (WLTP) into their local legislation to refuse to accept type approvals granted under the UN R83 and/or UN R101 as a compliance alternative to their national/regional legislation (i.e., aligned with GTR No. 15). OICA proposes to clarify the intent by deleting allusions to the measure as a form of derogation, to replace the phrase “may no longer accept” with “may refuse”, and to introduce a sunset clause to noting that the measure is intended as a stop-gap until such time as GTR No. 15 has been transposed into the corpus of UN Regulations.

Abstract from JSAE chassis dynamometer testing working group with particular regard to 4WD chassis dynamometer.

Report of the WLTP Transposition Task Force

Summary of the results of the Annex 4 Interest Group work under phase 2a of the development of GTR No. 15.

The purpose of the low temperature test is to check the level of specific pollutant emissions of vehicles in conditions that may easily be encountered during the winter season.

European Commission, Japan, and other stakeholder comments.

Official technical report detailing the rationale and decision-making behind the development of Amendment 2 (Development Phase 2a) of GTR No. 15.