Proposal for R138.02 Amendment Clarification

Proposal for amending the R138.02 regulation to clarify the maximum sound pressure level requirements for vehicles during reverse driving conditions. Stakeholders have agreed on a limit of 75dB(A) at the front plane for both standstill and driving motions, aiming to avoid misunderstandings during type approval processes.

• Proposal
• Amendment
• Sound Pressure
• Vehicle Regulations
• Clarification

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Uploaded on Mar 08, 2025 | 0 Views

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Presentation Transcript

1. Informal document GRBP-80-33 (80hGRBP, 17-20 September 2024, agenda item 5) Transmitted by the expert from Japan Presentation to support ECE/TRANS/WP.29/GRBP/2024/20 Clarification for UN-R 138.02 2024/9/17-20 JAPAN AUTOMOBILE STANDARDS INTERNATIONALIZATION CENTER 1

2. Proposal for R138.02 amendment <Original intent agreed by TF-QRTV> Through the discussion in TF-QRTV, the stakeholders had agreed the following definition for the maximum sound pressure level at the front plane in reverse condition. Comply with Table.2b Front plane Rear plane shall not exceed 75dB(A) R range standstill R range driving Mic Mic Fig. Reverse condition #10 TF-QRTV conclusion (Nov. 2023) TF-QRTV-10-07 Draft Report update Secretary https://wiki.unece.org/display/trans/TF-QRTV+%28UN-R138-02%29+-+10th+session+hybrid 2

3. Proposal for R138.02 amendment <Concern Description> Regarding when reversing (e.g., position R ) the maximum sound pressure requirement at the front plane of the vehicle, the current description is not coherent with TF-QRTV which has defined the limit value of 75dB(A) for both stand still and reverse driving. It may cause mis-understanding during type approval. Document: WP29-2024-066 Original intent shall not exceed 75dB(A) R range standstill R range driving 3

4. Proposal for R138.02 amendment <Proposal for R138.02 amendment> Table.2b Reverse Maximum Rear plane Front plane Standstill (0km/h) 69dB(A) 75dB(A) Driving (motion) 75dB(A) 75dB(A) 4