UN R83 Supplement 16 (06 series) · UNECE Regulation No. 83 (ECE R83) — Uniform provisions concerning the approval of vehicles with regard to the emission of pollutants according to engine fuel requirements.
UN R83 — Supplement 16 to the 06 series of amendments
Supplement 15 → 16
- What changed
- In Annex 4a, Appendix 7b, the formula for the effect of different tyre tread depth now subtracts TTD instead of multiplying by it.
- For the weighted mean in paragraph 2.1.(b) of Annex 4a, Appendix 7b, the text now refers to Annex 7 to UN GTR No. 15.
- Why
- When the methodology was copied from EU regulation, a “.” was wrongly introduced instead of a “-” in the formula.
- The reference to Annex 4 instead of Annex 7 of UN GTR No. 15 was wrong.
Q1What changed5 changes
Effect of different tyre tread depth (Annex 4a, Appendix 7b, para. 2.2.4.(a)(iv))
The formula for the effect of different tyre tread depth is now F0n = F0n³ − TTD. Before, the formula was F0n = F0n³ · TTD, so it multiplied by TTD. The sentence that refers to point 2.2.2. for the factors TTD now ends with a full stop.
Weighted mean RRC and UN GTR No. 15 (Annex 4a, Appendix 7b, para. 2.1.)
Item (b) of paragraph 2.1. gives a weighted mean if the tyres on the front and rear axles belong to different energy efficiency classes. This weighted mean now uses the equation in paragraph 3.2.3.2.2.2.3. of Annex 7 to UN GTR No. 15. Before, the text referred to that paragraph of UN GTR No. 15 Annex 4. The end punctuation of items (a), (b) and (c) also changes.
Q2Why it changed
- Proposed by
- Expert from the International Organization of Motor Vehicle Manufacturers
- Working party
- GRPE, 82nd session (January 2021)
Reasons
The formulas that calculate NEDC road load values from those determined under UN GTR No. 15 (WLTP) had one error. When the methodology was copied from EU regulation, a “.” was wrongly introduced instead of a “-” in the formula. The EU Joint Research Center, which is at the origin of the methodology, reviewed this correction.
Sources (3)
“This document aims at amending one error found in the formulas used for the calculation of a NEDC road load values from those determined according to UN GTR No. 15 (WLTP)”
“When copying the methodology from EU regulation, a ‘.’ was wrongly introduced instead of a ‘-‘ in the formula.”
“This correction has been review by EU Joint Research Center which is at the origin of the methodology.”
In Annex 4a, Appendix 7b, paragraph 2.1.(b), the reference to Annex 4 instead of Annex 7 of UN GTR No. 15 was wrong.
Source
“Correction of wrong reference to Annex 4 instead of Annex 7 of UN GTR No.15; in Annex 4a, Appendix 7b, paragraph 2.1.(b).”
Document trail
- 2020-11ProposalECE/TRANS/WP.29/GRPE/2021/3Proposal for the 06 and 07 series on Annex 4a, Appendix 7b
- —Working party adoptsECE/TRANS/WP.29/GRPE/82Session report, paras. 9 and 10
- 2021-04Sent to WP.29ECE/TRANS/WP.29/2021/69Text that GRPE sent to WP.29 and AC.1
- 2021-06WP.29 adoptsECE/TRANS/WP.29/1159Adopted at the 184th session (session report, para. 127)
- 2022-01-07In forceC.N.13.2022.TREATIES-XI.B.16.83UN depositary notification
Q3Who is affected
Vehicle manufacturer
- Update your F0n calculation for different tyre tread depth: the formula now subtracts TTD instead of multiplying by it.
- For the weighted mean RRC (Annex 4a), use paragraph 3.2.3.2.2.2.3. of Annex 7 to UN GTR No. 15.
Component supplier
- Update any road load calculation tool you supply: the tyre tread depth formula of Annex 4a now subtracts TTD.
Technical service / Approval authority
- Check F0n calculations for different tyre tread depth: the formula now subtracts TTD instead of multiplying by it.
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ⓘ This report gives advice only. It is not legal or type-approval advice.
More UN R83 change reports
- 09 series — Supplement 1
- 09 series — Base text
- 08 series — Supplement 4
- 08 series — Supplement 3
- 08 series — Supplement 2
- 08 series — Supplement 1
- 08 series — Base text
- 07 series — Supplement 18
- 07 series — Supplement 17
- 07 series — Supplement 16
- 07 series — Supplement 15
- 07 series — Supplement 14
- 07 series — Supplement 13
- 07 series — Supplement 12
- 07 series — Supplement 11
- 07 series — Supplement 9
- 07 series — Supplement 8
- 07 series — Supplement 7
- 06 series — Supplement 21
- 06 series — Supplement 20
- 06 series — Supplement 19
- 06 series — Supplement 18
- 06 series — Supplement 17
- 06 series — Supplement 15
- 06 series — Supplement 14
- 06 series — Supplement 13
- 06 series — Supplement 12
- 06 series — Supplement 11