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Proposal for Supplement 5 to the 02 series of amendments to Regulation No. 117
Document GRB/2013/10
24 June 2013

Text prepared by the Russian Federation to elaborate on the concept of tyre deceleration (dω/dt) in the test technology.

Submitted by Russia
Status: Superseded
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Previous Documents, Discussions, and Outcomes
7. (b) | Regulation No. 117

24. Recalling the purpose of ECE/TRANS/WP.29/2013/66, the Chair of GRRF stressed that WP.29 was expecting GRRF to conclude its deliberation about the wet grip limit values. The GRRF experts introduced their positions (GRRF-76-05, GRRF-76-07, GRRF-76-08, GRRF-76-11, GRRF-76-12, GRRF-76-26, GRRF-76-27, GRRF-76-28). The expert from the EC reported on the concerns expressed by the Directorate-General for Mobility and Transport of the European Commission (DG Move). GRRF confirmed the limit values proposed in para. 6.2.2. for Tyres of C2 category and agreed to amend the proposed limit values in para. 6.2.3. for Tyres of C3 category in ECE/TRANS/WP.29/2013/66. GRRF requested the secretariat to submit this amendment as reproduced in WP.29-162-05 to WP.29 and AC.1 for consideration at their March 2014 session.

24bis. The expert from the Russian Federation presented GRB-59-02 proposing a tyre rolling resistance test results evaluation using a mathematical algorithm, to be added as an alternative to the existing one in the text of the Regulation. He also presented the results of a validation study of the proposed algorithm for tyres of the C1 category performed in France, in cooperation with the Russian Federation (GRB-59-07 and GRB-59-08). GRRF noted that this proposal may be submitted by GRB to WP.29 as a supplement to UN Regulation No. 117. GRRF recommended further steps for a better understanding of the proposed method’s sensitivity, suggesting: (i) extending the validation study for tyres of categories C2 and C3 and (ii) verifying the application of the proposed alternative in the conditions of the conformity of production. The GRRF Chair invited the experts to provide their comments on the proposal to the GRB secretariat with a copy to the expert from the Russian Federation.

6. | Regulation No. 117 (Tyre rolling noise and wet grip adhesion)

15. The expert from the Russian Federation made a presentation (GRB-58-12) to introduce a revised proposal (ECE/TRANS/WP.29/GRB/2013/10) that would introduce a “Deceleration Calculator” software for the deceleration test method in the test procedure for measuring rolling resistance. The expert from France informed GRB that the proposed calculator had been verified for a first cycle of tests by the Technical Union for the Automobile, Motorcycle and Cycle Industries (UTAC). However, he added that the method should be still thoroughly analysed. The expert from ETRTO expressed some doubts on the variability of the method by temperature change and stated that further work was needed to demonstrate equivalence. The expert from the Russian Federation recalled that full cooperation was offered by the Russian experts as well as data sharing and asked GRB to take into consideration the positive experience developed by the industrial sector of his country in this field. The expert from France proposed to host a meeting of experts (date to be defined) in UTAC to further the exchange of views and finalize the proposal. The Chair of GRB suggested that other laboratories would start similar activities to evaluate the proposed method and devise possible alternative calculators to provide wider choice to future users. Finally, GRB endorsed the ad hoc meeting with the experts of ETRTO and the Russian Federation which was proposed by the expert from France to test the proposed “Deceleration Calculator”. It was also noted that once that the calculator was accepted by GRB as a valid alternative to the current one, it could be hosted on the WP.29 website, as an example, with an anonymous reference.

6. | Regulation No. 117 (Tyre rolling noise and wet grip adhesion)

18. The expert from the Russian Federation introduced ECE/TRANS/WP.29/GRB/2013/3, amended by GRB-57-01, proposing the use of a “Deceleration Calculator” software for the deceleration test method in the test procedure for measuring rolling resistance. He informed GRB about the variant of data processing in the rolling resistance deceleration test method basing on the dω/dt formula. He underlined that this variant was used as an alternative to the existing data processing stipulated in UN Regulation No. 117, not affecting the existing test methods, and that it fully matches ISO 28580 and the procedures of Annex 6 of UN Regulation No. 117. The “Deceleration calculator” is a mathematical tool providing high accuracy [σ < 0.001%; R2 > 0.999] of development in the experimental data. The concept dω/dt was incorporated into standard GOST R 52102.1 He also introduced GRB-57-25 to provide a background history on the development of legislation on rolling resistance and made a practical demonstration of the proposed “Calculator”.

19. GRB recommended that experts start using the proposed calculator and to provide comments at its September 2013 session. The expert from the Russian Federation was recommended to provide, in the meantime, further background information on the algorithms of the calculator and on both proposals (ECE/TRANS/WP.29/GRB/2013/3 and GRB-57-01), as well as demonstration at the next session of GRRF for an exchange of views.

7. (d) | Proposal for amendments to Regulations Nos. 28, 51, 59 and 117
Related and Previous Documents
Relates to UN R117 |