UN R51 Supplement 5 (03 series) · UNECE Regulation No. 51 (ECE R51) — Uniform provisions concerning the approval of motor vehicles having at least four wheels with regard to their sound emissions.
UN R51 — Supplement 5 to the 03 series of amendments
Supplement 4 → 5
- What changed
- In Table 1 of the Appendix to Annex 3, note **** now says “Applicable to vehicles of categories M1, N1 and M2 ≤ 3,500 kg”. Before, it said “Applicable only to Pure Electric Vehicle (PEV)” as defined in the 07 series of amendments to UN Regulation No. 83. The measure “Partial load driving ****” now reads “Defined partial load driving ****”.
- In Annex 7, paragraph 5.2., gear α = 4 now applies “for manual transmission and for automatic transmission tested in locked position with 6 or more gears”. The α = 3 line now says “for manual transmission” instead of “for all manual transmission”.
- Until May 1, 2020, Supplement 4 does not apply to existing approvals originally granted before its date of entry into force (new paragraph 11.10.). Until May 1, 2020, Supplement 5 does not apply to existing approvals originally granted before its date of entry into force (new paragraph 11.11.).
- Why
- For Table 1, the proposal agreed by GRB was limited to pure electric vehicles only. IWG ASEP proposed to extend partial load driving to vehicles of category M1, N1 and M2 ≤ 3,500 kg.
- The Annex 7 change aligns the principle of testing between automatic and manual transmission having more than 5 gears.
- Because of Revision 3 of the 1958 Agreement in combination with the transitional provisions of Supplement 3, Supplements 4 and 5 also needed transitional provisions.
Q1What changed10 changes
Partial load driving and ASEP anchor point in Table 1 (Appendix to Annex 3)
The measure “Partial load driving ****” in Table 1 now reads “Defined partial load driving ****”. Note **** now says “Applicable to vehicles of categories M1, N1 and M2 ≤ 3,500 kg”, instead of “Applicable only to Pure Electric Vehicle (PEV)”. For these vehicles, for further calculation of Lurban in Annex 3, the sound level measured under partial load must replace that under wide open throttle. A new sentence says that the achieved acceleration under partial load during the test must be used to calculate kP instead of awot ref. Another new sentence says that, although it is tested in partial load, symbols xwot (for example Lwot, awot, …) must be used. For ASEP**, new formulas give the anchor point parameters Lanchor and nanchor, with awot,ref according to 3.1.2.1.2.4. but not higher than 2.0 m/s².
Flowchart in Figure 4c (Gear selection using locked gear PART 2)
Figure 4c is amended. It is the flowchart for vehicles tested according to paragraph 3.1.2.1. of Annex 3 to this Regulation, for gear selection using locked gear (PART 2).
Gear α for manual transmission (Annex 7, para. 5.2.)
In Annex 7, paragraph 5.2., gear α = 4 now applies “for manual transmission and for automatic transmission tested in locked position with 6 or more gears”. Before, the α = 4 line did not name manual transmission. The α = 3 line now says “for manual transmission” instead of “for all manual transmission”. The α = 4 line looks at the acceleration calculated from AA to BB + vehicle length in gear 4. If it exceeds 1.9 m/s², the first higher gear α > 4 with an acceleration lower than or equal to 1.9 m/s² must be chosen.
Transitional provisions for Supplements 4 and 5 (paras. 11.10. and 11.11.)
Until May 1, 2020, Supplement 4 does not apply to existing approvals originally granted before its date of entry into force (new paragraph 11.10.). Until May 1, 2020, Supplement 5 does not apply to existing approvals originally granted before its date of entry into force (new paragraph 11.11.).
Q2Why it changed
- Proposed by
- Informal Working Group on Additional Sound Emission Provisions (IWG ASEP)
- Working party
- GRB, 68th and 69th sessions (September 2018 and January 2019)
Reasons
For Table 1, the proposal agreed by GRB was limited to pure electric vehicles only. IWG ASEP proposed to extend partial load driving to vehicles of category M1, N1 and M2 ≤ 3,500 kg.
Sources (3)
“The proposal agreed by GRB was limited to pure electric vehicles only”
“In this working document, IWG ASEP proposes extension to all vehicles.”
“to vehicles of category M1, N1 and M2 ≤ 3,500 kg, for the further calculation of Lurban in Annex 3”
The change aligns the flowchart with the amendment to paragraph 3.1.2.1.4.1 (c) in Supplement 3 to the 03 series of amendments.
Source
“1. The proposed change aligns the flowchart with the amendment to paragraph 3.1.2.1.4.1 (c) of Supplement 3 to the 03 series of amendments to UN Regulation No. 51.”
The Annex 7 change aligns the principle of testing between automatic and manual transmission having more than 5 gears. Progress of technology towards more fuel efficient and environmentally friendly vehicles leads to a higher number of gears, and the change compensates this. It avoids that a vehicle design offered as manual and automatic transmission is tested at very different conditions just because of the transmission design.
Sources (3)
“This proposal aligns the principle of testing between automatic and manual transmission having more than 5 gears.”
“This compensates the progress of technology towards more fuel efficient and environmentally friendly vehicles leading to higher number of gears.”
“It avoids that a vehicle design offered as manual and automatic transmission is tested at very different condition just because of the transmission design.”
Because of Revision 3 of the 1958 Agreement in combination with the transitional provisions of Supplement 3, Supplements 4 and 5 also needed transitional provisions. Supplement 4 and Supplement 5 each specify the same application date as Supplement 3.
Sources (3)
“Because of Revision 3 of the 1958 Agreement in combination with the transitional provisions of Supplement 3, it is necessary to also introduce transitional provisions in Supplement 4.”
“This Supplement 4 specifies the same application date as Supplement 3.”
“it is necessary to introduce also transitional provisions for Supplement 5. This Supplement 5 specifies the same application date as in Supplement 3.”
Document trail
- 2018-06ProposalECE/TRANS/WP.29/GRB/2018/10IWG ASEP proposal for Supplement 5
- —Working party adoptsECE/TRANS/WP.29/GRB/66GRB session report, para. 5
- 2018-11ProposalECE/TRANS/WP.29/GRB/2019/9IWG ASEP proposal for Corrigendum 1 to Supplement 4, with new paragraph 11.10.
- 2018-11ProposalECE/TRANS/WP.29/GRB/2019/11IWG ASEP amendment to the proposal for Supplement 5: new paragraph 11.11.
- —Working party adoptsECE/TRANS/WP.29/GRB/67GRB session report, para. 6
- 2019-01Sent to WP.29ECE/TRANS/WP.29/2019/4/Rev.1Revised text with the transitional provisions, submitted to WP.29 and AC.1
- 2019-03WP.29 adoptsECE/TRANS/WP.29/1145Adopted at the 177th session (session report, para. 146)
- 2019-10-15In forceC.N.529.2019.TREATIES-XI.B.16.51UN depositary notification
Q3Who is affected
Vehicle manufacturer
- For vehicles of categories M1, N1 and M2 ≤ 3,500 kg, consider “Defined partial load driving” in Table 1 as a measure.
- For manual transmission with 6 or more gears, be ready for the α = 4 rule of Annex 7.
Component supplier
- No direct action for this role.
Technical service / Approval authority
- When testing in partial load, use the achieved acceleration during the test to calculate kP instead of awot ref.
- For M1, N1 and M2 ≤ 3,500 kg, use the sound level measured under partial load for further Lurban calculation.
- For manual transmission with 6 or more gears, determine gear α by the α = 4 rule of Annex 7.
See every change side by side
RegVault customers compare every version of UN regulations, read the consolidated text and download the PDF.
ⓘ This report gives advice only. It is not legal or type-approval advice.