UN R129 Supplement 8 (03 series) · UNECE Regulation No. 129 (ECE R129) — Uniform provisions concerning the approval of Enhanced Child Restraint Systems used on board of motor vehicles (ECRS).
UN R129 — Supplement 8 to the 03 series of amendments
Supplement 7 → 8
- What changed
- Annex 15 now has a conditioning procedure (paragraph 1., Figure 1) for adjusters mounted directly on Enhanced Child Restraint Systems.
- Before the dynamic test, an adjuster mounted on a strap must now undergo 5,000 ± 5 cycles as specified in paragraph 7.2.6.2. Before, the Technical Service defined this test in consultation with the manufacturer.
- The calibration value of the ruler of the Annex 25 measurement device is now 79.7 cm instead of 78.7 cm.
- Why
- The changes to paragraph 6.7.2.7. and Annex 15 correct editing mistakes from proposals adopted at the sixty-first session of GRSP.
- Virtual verification of the Annex 25 calibration value showed a 10 mm error.
- Paragraph 6.1.3.6. was amended to remove an inconsistency between the method in the main body of the text and the Annex 25 measurement device.
Q1What changed50 changes
Sitting height check for booster cushions (para. 6.1.3.6.)
Item (b) no longer says that a horizontal plane is defined at a vertical distance of 770 mm from the Cr axis. Item (f) no longer says that the measured distance between the two points M and N represents the sitting height of a child. In the rounding example, a measured sitting height of 70.1 cm now gives a resulting stature of 136.05 cm instead of 135.65 cm. The smallest stature allowed in the example is now 137 cm instead of 136 cm. The captions of Figure 1, Figure 2 and Table 3 now start their main words with capital letters.
Calibration value of the ruler of the measurement device (Annex 25)
For calibration, with the device structure in contact with the supporting surface (Detail A), the scale must now show 79.7 cm (Detail B). Before, the calibration value was 78.7 cm. The annex now takes the nominal sitting height of the dummy, 78.7 cm, as a reference. It translates this value to the 80 mm distance from the test bench backrest where the sitting height of the child is measured. It also takes into account the different angles in between the backrest, the horizontal plane and the head position.
Notes on chest deflection and the thoracic spine in Table 4 (para. 6.6.4.3.1.)
The row “Chest deflection” now has the new footnote *****. This footnote says that for the Q10 dummy, the upper and lower chest deflection must be measured and the chest displacement X must be used. A value of 55 in the resultant chest acceleration row now has the new footnote ******. This footnote says “Thoracic Spine at location T4 according to ISO/TS 13499:2019”. Footnotes **, *** and **** and the entry “A head Cum 3 ms” have small wording changes, for example “three years” instead of “3 years”.
Test of adjusters before the dynamic test (para. 6.7.2.7.)
Before the dynamic test of paragraph 7.1.3., an adjuster mounted on a strap must now undergo 5,000 ± 5 cycles as specified in paragraph 7.2.6.2. Before, this test applied the principles of the test in paragraph 7.2.3., and the Technical Service defined it in consultation with the manufacturer. For an adjuster mounted directly on the child restraint, the paragraph now says “Enhanced Child Restraint System” instead of “Child Restraint System”.
Two conditioning procedures for adjusters (Annex 15)
The title of Annex 15 is now “Description of Conditioning for Adjusters”, without the words “connected to a strap”. New paragraph 1. and Figure 1 give the conditioning for adjusters mounted directly on Enhanced Child Restraint Systems, with a method and a cycle procedure. This cycle is repeated as specified in paragraph 6.7.2.7. Paragraph 2. and Figure 2 give the conditioning for adjusters connected to a strap (not directly mounted on Enhanced Child Restraint Systems). In paragraph 2.1.2., the reference position of the strap is now the one described in paragraph 7.2.6.2. instead of paragraph 7.2.6.
Test report information for a Type Approval Extension (para. 8.1. and Annex 27)
Paragraph 8.1. now says that for a new Type Approval all information must be provided. For a Type Approval Extension, the applicant may limit this information to cover the changes to the ECRS. Annex 27 now says that its list applies to the test reports that are included for a new Type Approval Application. For Type Approval Extensions, Annex 27 says that only the information related to the changes to the ECRS must be provided.
Paper and digital forms of the information for use (para. 14.1.)
Option (b) of paragraph 14.1. now gives a paper form fulfilling requirements 14.2. and 14.4., together with a digital form fulfilling requirements 14.3. Before, option (b) was a digital form fulfilling requirements 14.2., 14.3. and 14.4. Option (a), a paper form fulfilling requirements 14.2. and 14.3., now ends with a semicolon before the word “or”.
Q2Why it changed
- Proposed by
- Expert from the European Association of Automotive Suppliers (CLEPA); expert from the Netherlands
- Working party
- GRSP, 71st session (May 2022)
Reasons
The changes to paragraph 6.7.2.7. and Annex 15 correct editing mistakes from proposals adopted at the sixty-first session of GRSP. The changes to paragraph 6.7.2.7. were agreed at that session and implemented in the 01 series of amendments. But they were erroneously omitted from the 02 series (and subsequently from the 03 series). The amendment to Annex 15 reinstates a figure and procedure for testing adjusters mounted directly on the ECRS. They were mistakenly overwritten by a figure and procedure for testing adjusters connected to a strap, instead of added to.
Sources (3)
“The amendments to paragraph 6.7.2.7. and to Annex 15 correct editing mistakes that were introduced by proposals adopted at the sixty-first session of the Working Party on Passive Safety (GRSP)”
“The amendment to paragraph 6.7.2.7. introduces changes agreed at the above-mentioned session of GRSP that were implemented in the 01 series of amendments but erroneously omitted from the 02 series (and subsequently to the 03 series).”
“reinstates a figure and procedure for testing adjusters mounted directly on the Enhanced Child Restraint System (ECRS), which was mistakenly overwritten, instead of added to, by a figure and procedure for testing adjusters connected to a strap”
The proposal for paragraph 8.1. was made to clarify that the whole report is not needed for type approval extensions. Paragraph 14.1.(b) was reviewed so that technical services interpret it correctly.
Sources (2)
“The amendment to paragraph 8.1 clarifies that for type approval extensions, only the changes to the ECRS shall be provided, therefore the whole report in that case is not needed.”
“paragraph 14.1.(b) was reviewed to ensure the correct interpretation by technical services.”
The Q10 dummy is the only dummy with a 2D chest deflection sensor. To obtain the monitoring data in the correct format, it was required to clarify what measure is needed. The Q10 dummy includes the possibility for two spot measurements of the thoracic spine accelerations. To clarify the correct measurement, reference is made to T4, which ISO/TS 13499:2019 defines.
Sources (2)
“The Q10 dummy is the only dummy with a 2D chest deflection sensor. To obtain the monitoring data in the correct format it is required to clarify what measure is needed.”
“The Q10 dummy includes the possibility for two spot measurements of the thoracic spine accelerations. To clarify the correct measurement, reference is made to T4 which is defined by ISO/TS 13499:2019”
There was an inconsistency between the method described in the main body of the text and the measurement device described in Annex 25. Paragraph 6.1.3.6. was amended to remove this conflict. The calculation in paragraph 6.1.3.6.(g) was incorrect. It came from a linear regression using all of the table values, instead of linear interpolation between the two nearest values in Table 3.
Sources (2)
“there is an inconsistency between the method described in the main body of the existing text and the measurement device described in Annex 25. Paragraph 6.1.3.6. has therefore been amended to remove this conflict.”
“The calculation in paragraph 6.1.3.6. (g) was incorrect since it came from a linear regression using all of the table values instead of using linear interpolation between the two nearest values in table 3”
Virtual verification of the Annex 25 calibration value showed a 10 mm error. The error occurred because the 5th percentile female anthropomorphic test device and the Q dummies have different distances to the test bench backrest. It was therefore proposed to increase the Annex 25 calibration value by 10 mm.
Sources (3)
“Virtual verification of the calibration value stated in Annex 25 has shown a 10 mm error.”
“This error occurred because there are different distances to the test bench backrest between the 5th percentile female anthropomorphic test device and the Q dummies.”
“It is therefore proposed to increase the Annex 25 calibration value by 10 mm.”
Document trail
- 2022-02ProposalECE/TRANS/WP.29/GRSP/2022/7Proposal by the expert from the European Association of Automotive Suppliers
- 2022-02ProposalECE/TRANS/WP.29/GRSP/2022/8Proposal by the expert from the Netherlands on the chest deflection of the Q10 dummy
- 2022-02ProposalECE/TRANS/WP.29/GRSP/2022/9Proposal by the expert from the Netherlands on the minimum sitting height for booster cushions
- —Working party adoptsECE/TRANS/WP.29/GRSP/71Session report, paras. 25 and 26, with Annex III
- 2022-08Sent to WP.29ECE/TRANS/WP.29/2022/128Text that GRSP sent to WP.29 and AC.1
- 2022-11WP.29 adoptsECE/TRANS/WP.29/1168Adopted at the 188th session (session report, para. 138)
- 2023-06-05In forceC.N.177.2023.TREATIES-XI.B.16.129UN depositary notification
Q3Who is affected
Vehicle manufacturer
- No direct action for this role.
Component supplier
- Check the minimum stature of your booster cushions with the ruler calibration value of 79.7 cm (Annex 25).
- Under option (b) for user information, give a paper form for 14.2. and 14.4. and a digital form for 14.3.
- Be ready for the 5,000 ± 5 cycle test of paragraph 7.2.6.2. for adjusters mounted on a strap.
Technical service / Approval authority
- Calibrate the Annex 25 ruler to 79.7 cm (Detail B), with the device structure on the supporting surface (Detail A).
- For an adjuster mounted on a strap, use the 5,000 ± 5 cycle test of paragraph 7.2.6.2. before the dynamic test.
- Use paragraph 1. of Annex 15 (Figure 1) to condition adjusters mounted directly on Enhanced Child Restraint Systems.
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ⓘ This report gives advice only. It is not legal or type-approval advice.
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