Revised mandate (with changes marked up) as approved by the GRB at its January 2014 session for the informal working group established to finalize revisions to UN Regulation No. 51 and UN Regulation No. 59 with a view towards their alignment with the latest European Union decision concerning noise emissions from vehicles having at least four wheels.

Text prepared by the GRB Expert Group on Regulation 51 and revised during the GRB-59 session consolidating the proposed 03 series of amendments to UN Regulation No 51 developed during the informal group’s fourth meeting in Brussels on July 4 plus additions from November 8. This version removes references to “acoustic vehicle alerting systems” (AVAS)

Revised mandate as approved by the GRB at its January 2014 session for the informal working group established to finalize revisions to UN Regulation No. 51 and UN Regulation No. 59 with a view towards their alignment with the latest European Union decision concerning noise emissions from vehicles having at least four wheels.

Overview of the NordTyre Project to investigate the noise performance of passenger car tyres on typical road surfaces in Norway, Sweden and Denmark and to clarify which combinations of road surfaces and tyres yield the lowest tyre/road noise levels.

Proposal (revised from its earlier version) to allow horn sound level testing with the engine running and lower the sound pressure level requirement for light-duty vehicles from 93 dB (A) to 90 dB (A).

Presentation in support of the proposal for additional vehicle categories and sound emission level requirements under UN R51. A “Flat Front Light N1 Vehicle” is defined as:

• GVM ≤ 2.5 ton
• PMR (power to mass ratio) of GVM ≤ 35kW/t
• Engine capacity ≤ 660cc
• d value<1,100mm

Proposal to allow horn sound level testing with the engine running and lower the sound pressure level requirement for light-duty vehicles from 93 dB (A) to 90 dB (A).

Report of the ad‐hoc working group organized in accordance with the recommendation of the 58th GRB session to consider testing and evaluation of the variant method using the dω/dt form proposed by Russia.

Testing and Evaluation of the variant method using the dω/dt form.

Overview of the NordTyre Project to investigate the noise performance of passenger car tyres on typical road surfaces in Norway, Sweden and Denmark and to clarify which combinations of road surfaces and tyres yield the lowest tyre/road noise levels.

Regulation 117, Annex 6 specifies several time duration values while Annex 6, Appendix 1 gives only one control accuracy value for time in its paragraph 4 (d): plus or minus 0.02 second. This means that this accuracy value applies to all the time durations specified in Regulation 117, Annex 6 and quoted above. This is not realistic for durations of more than one minute and not well fitted to the need of data acquisition for deceleration method. Therefore, Russia and ETRTO propose to introduce two accuracy sets of values in paragraphs 4 and 5 of Regulation 117, Annex 6, Appendix 1:

1. a control accuracy of +/- 0.2 % s and a corresponding instrumentation accuracy of +/- 0.1 % s for the time increments specified in Annex 6 paragraph 3.5.a for the data acquisition in the deceleration method, both in ∆ω/∆t or dω/dt form, and
2. a control accuracy of +/- 5% and an instrumentation accuracy of maximum +/-10 sec for the other time durations specified in Annex 6.

Text prepared by the GRB Expert Group on Regulation 51 consolidating the proposed 03 series of amendments to UN Regulation No 51 at their fourth meeting in Brussels on July 4 plus additions from November 8. This version removes references to “acoustic vehicle alerting systems” (AVAS)

Proposal by the WP.29 secretariat to consider amending the Consolidated Resolution to adhere with provisions of the UN Regulations concerning noise limits. Presently, the resolution (which provides a framework and general reference for UN Regulations) permits a 5 db(A) tolerance in measuring noise levels while the UN Regulations 51, 41 and 63 referred to in the resolution permit narrower margins of 1 db(A) or 3 db(A).

The Russian Federation has developed a “Deceleration Calculator” for use in the UN R117 procedures. Following work by an ad hoc group (including NAMI, UTAC, and ETRTO) formed to review and validate this tool, Russia has prepared this new proposal, modifying the version (document GRB/2013/10) submitted at the last GRB session. The changes primarily concern the explanation of the tool rather than the basic mathematical equations.