This proposal concerns primarily amendments to Annex 7 of UN Regulation No. 51. The proposed changes are based on the 03 series of amendment to UN Regulation No. 51 up to Supplement 10.

Informal consolidated text for better reading.

Technical Background Information to Supplement 11 to UN R51.03

An improvement intended to increase vehicle robustness in Annex 3 creates more difficulties in RD-ASEP assessment. Small variations in Annex 3 parameters may result in unexpected substantial exceedances in Annex 7. Minimal changes in the calculated tyre share at the anchor point may cause vehicles to fail Annex 7. The regulation should ensure realistic test effort and workload for compliance verification, as current requirements may require up to 180 combinations per type across test tracks, temperatures, driving modes, and tyres.

Document presents comparison of UN R51.03 ASEP, UN R51.04 RD-ASEP, and an updated ASEP alternative concept. It outlines improvements including explicit testing of all conditions to reduce test detection schemes, expanded vehicle speed range to 1-100 km/h, random test point evaluation, and extension to part load conditions. Main open topics include tyre model stability, technology and model temperature correction, application and uncertainties, and criteria and judgement safeguards. Document identifies quick wins through clarification that all modes must be tested and suggests main improvements can be realized through an updated, simple ASEP with part load testing capabilities.

Proposal to replace the current logarithmic function with a segmented function that linearizes the curve in the unstable area near the clipping boundary. The new formulation uses a tangent line to the logarithmic curve below the tangency point and clips to a minimum value of 10 dB. Two parameters define the tangency and clipping conditions: clipping value of 10 dB and slope of 5 dB per unit. The detailed formulation provides the mathematical definitions of the logarithmic function, the linearized segment, helper variables, and constraints including tangency and asymptote conditions.

OICA and Euromot response to the informal group on REC request to submit a proposal on NOx control measures based on the Euro VI and Nonroad Stage IV NOx control provisions.

MS Word download: Working draft of the proposal that would be submitted to incorporate provisions for Rechargeable Energy Storage Systems into UN Regulation 100. This version based upon document GRSP-50-06.

Diagram and tables for use in Annex 8C of the proposed amendment to introduce provisions for Rechargeable Energy Storage Systems (REESS) into UN Regulation 100.

Draft text for Annex 4B (“Isolation Resistance Measurement Method for Component-based Tests of REESS”) of the proposed amendment to add provisions for Rechargeable Energy Storage Systems to UN Regulation 100.

Draft provisions concerning protections against overcurrent, overcharge, and overdischarge.