UN R16 Supplement 4 (08 series) · UNECE Regulation No. 16 (ECE R16) — Uniform Provisions Concerning the Approval of: Safety-Belts and Restraint Systems, for Occupants of Power-Driven Vehicles.
UN R16 — Supplement 4 to the 08 series of amendments
Supplement 3 → 4
- What changed
- Figures 2 and 3 of Annex 17, Appendix 5 (booster seat envelopes ISO/B2 and ISO/B3) get new drawings.
- Each of these two figures gets a new key item: "Dashed lines mark the area where an anti-rotation device, or similar is allowed to protrude".
- Figures 9 and 10 of Annex 17, Appendix 2 get new drawings of the i-Size support leg installation assessment volume.
- Why
- The proposal from Spain says that the booster seat envelope change would allow a support leg to protrude from the booster seat Child Restraint Fixtures.
- The expert from CLEPA said that a higher support leg volume would improve the compatibility between the support leg volume and the ISO envelopes.
Q1What changed9 changes
Booster seat envelopes ISO/B2 and ISO/B3 (Annex 17, Appendix 5, Figures 2 and 3)
Figures 2 and 3 of Annex 17, Appendix 5 give the envelope dimensions for booster seats ISO/B2 and ISO/B3. This supplement replaces the drawings of both figures. The key of each figure gets a new item 2: "Dashed lines mark the area where an anti-rotation device, or similar is allowed to protrude". The existing key text on line E is now numbered as item 1, and its words do not change.
i-Size support leg installation assessment volume (Annex 17, Appendix 2, Figures 9 and 10)
Figures 9 and 10 of Annex 17, Appendix 2 show the i-Size support leg installation assessment volume in side view and 3D view. This supplement replaces the drawings of both figures. Figure 10 now also states "(all dimensions in millimetres)".
Q2Why it changed
- Proposed by
- Expert from Spain (booster seat envelopes) and expert from the European Association of Automotive Suppliers (CLEPA) (support leg volume)
- Working party
- GRSP, 72nd session (December 2022)
Reasons
The proposal from Spain is about non-integral ECRS of category i-Size with a support leg that cannot be hidden. These ECRS are part of a multigroup, from 76 cm to 100 cm integral. The proposal says that it must be possible to approve such an ECRS with the support leg installed, as a specific vehicle booster seat. The change to the booster seat envelopes would allow a support leg to protrude from the booster seat Child Restraint Fixtures.
Sources (3)
“For non-integral ECRS which are part of a multigroup, from 76 cm to 100 cm integral, with support leg, category i-Size, and where the support leg cannot be hidden”
“it shall be possible to approve ECRS with the support leg installed as a specific vehicle booster seat.”
“This modification to the booster seat envelopes would allow a support leg to protrude from the booster seat Child Restraint Fixtures”
At GRSP, the expert from CLEPA gave more evidence from impact tests and simulations to justify the proposal from Spain.
Source
“The expert from CLEPA provided more evidence from impact tests and simulations to justify the proposal”
For the ISO/F2X envelope, UN Regulation No. 16 shows a 200 mm high area where a support leg or similar may protrude. The CLEPA proposal raises the top surface of the support leg volume to match this support leg opening, to give more space for support legs. CLEPA said that this would improve the compatibility between the support leg volume and the ISO envelopes. This would be particularly useful for large rearward facing CRS designs with support legs.
Sources (3)
“The dashed line 2) represents the area where a support leg or similar may protrude. For the ISO/F2X envelope, this is indicated with a height of 200 mm.”
“the top surface of the support leg volume has been raised upwards to match the support leg opening in the ISO/F2X envelope to facilitate more space for support legs.”
“Increasing the height of the support leg volume would improve the compatibility between the support leg volume and the ISO envelopes. This would be particularly useful for large rearward facing CRS designs with support legs.”
CLEPA said that better compatibility between the CRF envelopes and the support leg will allow improved load paths and so less material. This gives the potential to reduce CRS weight and to improve handling for consumers. A larger volume would also help designs that contain electronics for user misuse warnings.
Sources (3)
“Improving the compatibility between the CRF envelopes and the support leg will have environmental benefits as it will allow improved load paths which will lead to a reduction in materials.”
“there is the potential to reduce CRS weight, improving handling for consumers.”
“Enlarging this volume would also benefit those designs containing electronics for user misuse warnings.”
CLEPA said that the additional support leg volume already overlaps with the ISO/R2 volume. So little or no extra space is required, depending on the ISOFIX position.
Source
“The additional support leg volume already overlaps with the ISO/R2 volume and therefore little or no extra space is required (depending on ISOFIX position).”
Document trail
- 2021-09ProposalECE/TRANS/WP.29/GRSP/2021/20Proposal prepared by the expert from Spain for the booster seat envelopes
- 2021-09ProposalECE/TRANS/WP.29/GRSP/2021/25Proposal by the expert from CLEPA for the support leg volume
- —Working party adoptsECE/TRANS/WP.29/GRSP/72Session report, paras. 11 and 13: the Spain proposal adopted as amended by Annex III, the CLEPA proposal not amended
- 2023-03Sent to WP.29ECE/TRANS/WP.29/2023/46Text that GRSP sent to WP.29 and AC.1
- 2023-06WP.29 adoptsECE/TRANS/WP.29/1173Adopted at the 190th session (session report, para. 165)
- 2024-01-05In forceC.N.5.2024.TREATIES-XI.B.16.16UN depositary notification
Q3Who is affected
Vehicle manufacturer
- Compare your i-Size seating positions with the new drawings of the support leg installation assessment volume in Annex 17.
Component supplier
- Compare your booster seat designs with the new ISO/B2 and ISO/B3 envelope drawings in Annex 17.
- Compare any anti-rotation device, or similar, on your booster seat with the dashed-line area in the ISO/B2 and ISO/B3 drawings.
- Compare your i-Size support leg designs with the new drawings of the support leg installation assessment volume.
Technical service / Approval authority
- Use the new ISO/B2 and ISO/B3 envelope drawings when you assess the external dimensions of booster seats.
- Use the new support leg installation assessment volume drawings to assess i-Size seating positions for support leg compatibility.
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ⓘ This report gives advice only. It is not legal or type-approval advice.
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