UN R160 Supplement 2 (01 series) · UNECE Regulation No. 160 (ECE R160) — Uniform provisions concerning the approval of motor vehicles with regard to the Event Data Recorder.
UN R160 — Supplement 2 to the 01 series of amendments
Supplement 1 → 2
- What changed
- In Annex 4, Table 1, the “+/- 10%” accuracy of post-crash lateral and longitudinal acceleration now relates to the full range of the accelerometer.
- The format for lateral acceleration recorded in rollover is now at the option of the manufacturer.
- Why
- The accuracy tolerance could be applied in multiple ways, which can lead to different interpretations by type-approval authorities.
- In rollover events, lateral acceleration is not recorded with the sensors used for lateral air bag deployments, so the format requirements are not appropriate.
Q1What changed3 changes
Accuracy of post-crash lateral and longitudinal acceleration (Annex 4, Table 1)
In Annex 4, Table 1, a new footnote now applies to the accuracy “+/- 10%” of lateral acceleration (post-crash) and longitudinal acceleration (post-crash). It says: “+/- 10 per cent of the full range of the accelerometer used in the Electronic Control Unit (ECU) containing the EDR function”.
Format of lateral acceleration in rollover events (Annex 4, Table 1)
In Annex 4, Table 1, a new footnote applies to “Rollover” in the row for lateral acceleration (post-crash). It says: “Format for lateral acceleration recorded in rollover is at the option of the manufacturer”.
Q2Why it changed
- Proposed by
- Informal Working Group on Event Data Recorder / Data Storage System for Automated Driving
- Working party
- GRSG, 125th session (March 2023)
Reasons
There are multiple ways to apply the acceleration data accuracy tolerance. This can lead to different interpretations by type-approval authorities. The working group set the tolerance as “+/- 10 per cent of the full range of the accelerometer used in the ECU containing the EDR function”.
Sources (3)
“There are multiple ways in which the acceleration data accuracy tolerance can be applied.”
“This can potentially lead to different interpretations when applied by type-approval authorities.”
“To resolve this the IWG specified that the currently specified accuracy tolerance be specified as "+/- 10 per cent of the full range of the accelerometer used in the ECU containing the EDR function".”
In rollover events, lateral acceleration is not recorded with the sensors used for lateral air bag deployments. For this reason, the format requirements are not appropriate. A footnote makes it clear that the format for lateral acceleration in rollover events is at the option of the manufacturer.
Sources (2)
“Since lateral acceleration in rollover events are not recorded using the same sensors as used for lateral air bag deployments, the format requirements are not appropriate”
“a footnote was added to clarify that the format for lateral acceleration in rollover events is at the option of the manufacturer.”
Document trail
- 2023-01ProposalECE/TRANS/WP.29/GRSG/2023/15Proposal by the Informal Working Group on EDR/DSSAD
- —RevisedGRSG-125-04-Rev.1Amendments to ECE/TRANS/WP.29/GRSG/2023/15 by the expert from OICA
- —Working party adoptsECE/TRANS/WP.29/GRSG/104Session report, para. 30 and annex V
- 2023-08Sent to WP.29ECE/TRANS/WP.29/2023/102Text that GRSG sent to WP.29 and AC.1
- 2023-11WP.29 adoptsECE/TRANS/WP.29/1175Adopted at the 191st session (session report, para. 180)
- 2024-06-15In forceC.N.273.2024.TREATIES-XI.B.16.160UN depositary notification
Q3Who is affected
Vehicle manufacturer
- Meet the new accuracy footnote for post-crash lateral and longitudinal acceleration.
- Choose the format of lateral acceleration recorded in rollover events.
Component supplier
- No direct action for this role.
Technical service / Approval authority
- Check post-crash lateral and longitudinal acceleration against the new accuracy footnote.
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ⓘ This report gives advice only. It is not legal or type-approval advice.