Documents (Latest posted on 4 Mar 2021)
Related Meetings : Working Party on Passive Safety | Session 51
Documentation Discussion/Report

5. The expert from the United Kingdom, Chair of the informal working group on UN GTR No. 7 Phase 2, informed GRSP about the ongoing activities of the group:

(a) The informal working group had made good progress on development of a proposal to redefine the height of the head restraints in terms of its “effective” rather than absolute height and to deliver a new procedure for its measurement. It was noted that the actual value to be ascribed as a height requirement was sensitive and that it may be more efficient to discuss this during GRSP proper sessions rather than during the meetings of the informal working group.

(b) The informal group had noted that there are differences in some dimensions of the various three-dimensional H point machines (3-D “H”) in the market and that some manufacturers use tighter tolerances for their machines than those defined in the Society of American Engineers (SAE) standard. The informal working group is considering whether new tolerances for the 3-D H machine should be specified and, if so, whether this should be specific to UN GTR No. 7 (and UN Regulation No. 17) or for all UN Regulations and UN GTRs where the machine is used. The expert from SAE was invited as members of the informal working group and it was hoped that proposals for a transparent and open definition of the machine could be agreed.

(c) Regarding the dynamic test to assess the risk of whiplash injury, it was confirmed that the group is working for an agreement to define only the Biofidelic Rear Impact Dummy (BioRID II) within the UN GTR (replacing the current reference to the Hybrid III dummy). The development of injury criteria was of critical importance to the delivery of this outcome but unfortunately research in this area has not proceeded as scheduled.

6. The Chair of the informal working group reminded GRSP that the European Enhanced Vehicle Safety Committee (EEVC) recommended BioRID II as a unique choice for a kinematic assessment and that GRSP had received a proposal from the experts of Japan and the EC to adopt this approach into UN Regulation No. 17. He added that an initial assessment of the data from the recent EC study suggested that the reproducibility question for BioRID was not an issue when used for kinematics. He indicated that the drafting of UN GTR currently provides for BioRID to be introduced as an option to Hybrid III and this possibility, using the kinematic approach, remained. Finally, he announced that the next meeting of the informal working group was scheduled on 18-19 of June 2012 in Munich, Germany.

7. The expert from Germany, Chair of the BioRID Technical Evaluation Group (TEG), introduced the status report (GRSP-51-22) of the group. He underlined that the dummy response was sensitive to the change of parts and that certification tests and better control of material properties might be needed.

8. The expert from the Netherlands introduced GRSP-51-23 detailing the main conclusion of the informal working group on UN GTR No. 7 Phase 2 concerning the height of head restraint issue. Moreover, through GRSP-51-24 he underlined the actual need for increasing head restraint height. The expert from OICA stated that the discussion should focus first on the definition of the measurement method and then on the height thresholds. Referring to the first phase of the UN GTR, the expert from OICA reminded GRSP that EEVC conclusion at that time was for introducing a limited increase of the height and of a backset of 40 mm to maximize cost benefits. GRSP agreed to resume discussion at its December 2012 session on possible proposals on draft UN GTR No. 7 phase 2 submitted by the informal working group. It was also recommended that similar proposals would also be simultaneously made in the same time to UN Regulation No. 17 to keep the texts of the two Regulations aligned.

9. GRSP noted the decision of WP.29, at its March 2012 session (ECE/TRANS/WP.29/1095 para. 93) to develop a Special Resolution No. 2 (S.R.2) for a protocol to manage drawings, calibration and maintenance associated with test tools. As a follow up of this discussion the Chair of the informal working group on UN GTR No. 7 Phase 2 introduced GRSP-51-37 as a concrete proposal based on the inclusion of BioRID II dummy as a start. The proposal received in principle the endorsement of GRSP and experts were invited to send further comments in due time to the Chair of the informal working group on UN GTR No. 7, to allow him to prepare an updated proposal for the June 2012 session of WP.29 for consideration.