ISO Technical Updates for Vehicle Safety Regulations
Explore the latest technical updates by ISO and SAE focusing on reducing measurement uncertainty and enhancing reported results for pedestrian safety in vehicle regulations. Key areas include revised noise criteria, new metrics for tonal loudness, and alignment between FMVSS and R138 regulations.
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Presentation Transcript
Informal document GRB-75-03 75th GRBP, 8-11 February 2022, Submitted by the expert of ISO Agenda item 3 ISO 16254 Technical Measurement Development Doug Moore ISO TC43/SC1/WG42
Summary The Society of Automotive Engineers (SAE) Cooperative Research Program (CRP) final report on FMVSS 141 measurement uncertainty has been published. There are common testing elements between FMVSS 141 (US) and R138 (UN) regulations. ISO TC43/SC1/WG42 has reviewed the report of the SAE CRP and the SAE CRP recommendations for ISO 16254. WG42 has prepared a Committee Draft (CD) document incorporating the CRP recommendations for 16254. The CD ballot will conclude in spring 2022. ISO 16254 is the technical basis for R138. The ISO development timing will support GRBP s full review of regulation 138
Technical Updates The areas under study by ISO and SAE have been communicated in GRBP-69-26 and GRBP-70-09. Updates are targeted in two areas: 1. Measurement uncertainty reduction 2. Improving the relevance of reported results to pedestrian safety
Measurement uncertainty reduction Revised background noise criteria for testing. Additional microphone locations. Revised processing of overall and 1/3 octave sound pressure levels.
Improving the relevance of reported results to pedestrian safety Reduction in measurement uncertainty improves the confidence that a vehicle has the intended sound levels required for pedestrian safety as experienced by the pedestrian. The new metric of Tonal Loudness improves confidence the frequencies used for Frequency Shift are audible to a pedestrian.
SAE CRP documents SAE CRP overview summary https://sd.iso.org/documents/ui/#!/browse/iso/iso-tc-43/iso-tc-43- sc-1/iso-tc-43-sc-1-wg- 42/library/5/7412941_LL/SAE%20CRP%20Draft%20Final%20Report% 20-%20July%202021 SAE CRP final report https://sd.iso.org/documents/open/7d07891c- f5c7-413f-9f88-501919fe8345
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