| UN R51: RD-ASEP issues list |
| Reference Number: RDASEP-13-02/Rev.1 |
| Meeting Sessions: 13th RDASEP session (10-12 Jun) |
| Document date: 05 Jun 26 |
| Relevant to: UN Regulation No. 51 | Vehicle Noise Emissions |
| Click here to view the full document file |
| UN R51: Working draft proposal for a 04 series of amendments |
| Reference Number: RDASEP-13-03 |
| Meeting Sessions: 13th RDASEP session (10-12 Jun) |
| Document date: 05 Jun 26 |
| Relevant to: UN Regulation No. 51 | Vehicle Noise Emissions |
| Click here to view the full document file |
| RD-ASEP informal group draft status report to GRBP |
| Reference Number: RDASEP-13-04 |
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The IWG RD-ASEP informal group is developing a mandatory procedure for UN R51 after the monitoring phase. The Analysis Task Force determined vehicle databases and expectation model are suitable for RD-ASEP use. The Editing Task Force created a consolidated R51.04 draft incorporating R51.03 Supplements up to Supplement 11, with revised manipulation and defeat device provisions and mandatory random testing for approval. R51.04 RD-ASEP expands vehicle speed range to 0-100 km/hr, adds vehicle performance criteria, requires testing for approval, and permits random test points and any acceleration position, compared to R51.03 ASEP. |
| Meeting Sessions: 13th RDASEP session (10-12 Jun) |
| Document date: 05 Jun 26 |
| Relevant to: UN Regulation No. 51 | Vehicle Noise Emissions |
| Click here to view the full document file |
| Proposal for the RD-ASEP issues list |
| Reference Number: RDASEP-13-05 |
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In vehicles with automatic transmissions, upshifts during testing cause SEM expected values to be exceeded. The proposal addresses three cases: vehicles with non-locked gear ratios, vehicles with locked gear ratios, and vehicles with only one gear ratio. For Case 1, such data does not meet conditions in R51-03 Annex 9 “4.5.2. Non-locked transmissions” and require no SEM correction. For Case 2, the proposal adds text to Annex 9 (7), Appendix 1, paragraphs 3.4. and 3.5., permitting substitution of maximum engine speed nMAX(AA-BB)TEST for nBBTEST when the maximum engine speed between AA’ and BB’ exceeds the engine speed at BB’. |
| Submitted by: JASIC |
| Meeting Sessions: 13th RDASEP session (10-12 Jun) |
| Document date: 09 Jun 26 |
| Relevant to: UN Regulation No. 51 | Vehicle Noise Emissions |
| Click here to view the full document file |
| Proposals for RD-ASEP issues list (Nos. 13 and 17) |
| Reference Number: RDASEP-13-06 |
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Current RD-ASEP derives the regulatory level based on the certified value without accounting for margin against regulatory values of the certified value. RD-ASEP additionally regulates partial acceleration, unlike current ASEP which only stipulates full-throttle acceleration. It is proposed that RD-ASEP should take into account a margin against the regulatory values of the certification values, similar to current ASEP, to prevent quiet vehicles such as BEVs from being unfairly deemed NG. |
| Submitted by: JASIC |
| Meeting Sessions: 13th RDASEP session (10-12 Jun) |
| Document date: 09 Jun 26 |
| Relevant to: UN Regulation No. 51 | Vehicle Noise Emissions |
| Click here to view the full document file |
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