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Background

Informal Document No . GRRF-67-35 (67th GRRF, 2-5 February 2010, agenda item 9(f)). Proposal for Alignment procedure using RRC value among Technical Services. Background.

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Background

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  1. Informal Document No. GRRF-67-35 (67th GRRF, 2-5 February 2010, agenda item 9(f)) Proposal for Alignment procedure using RRC value among Technical Services Background The EC proposal contains the provisions on technical services inter-laboratory comparison testing and machine alignment so as to minimize variances in the measurement results between technical services. While Japan supports this idea basically, ・The alignment procedures in the EC proposal seem to be lacking, ・Current test procedures specified in ISO28580 are not enough to keep the accuracy among each technical service test sites.

  2. Japan proposal Japan proposes to insert TSs Alignment procedure of RRC standard value as the following slides

  3. ①　Decide two Specific Alignment Tyres ( Para. 3) ：HigherRRC ：LowerRRC H L ②　Measurementof alignment tyres (using same batch tyre) at Technical Services (TSs) A B C TS: L H A B Adopting average value as ‘Standard Value’ C

  4. ③　Calibration Formula Transforming each site’s measurement value to calibrated value by using the correlation line which is calculated from the standard values. B A 10.5 10.5 Calibrated value 7 Calibrated value 7 Measurement value in each site Measurement value in each site 7 10.3 7.2 11.0 Measurement Value Tested Tyre A 10.5 C B 7 C Calibrated value 6.8 10.2 Measurement value in each site

  5. ③　Calibration Formula （Example of transformation measurement value to calibration value） Approximation line A 10.5 9.12 7 7 10.3 Calibration Formula: 9.00 Calibration value (Evaluation value) = (1.0606 ×Measurement value) – 0.4242 If the measurement value is 9.00, then the evaluation value is 9.12

  6. Conclusion By adopting the alignment procedures among Technical Services proposed by Japan, it will be possible equally to compare the compliance test results among different Type Approval Authorities.

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