Abstract
Since 2012, the Korean and EU governments have been running a tyre labelling system. All tyres sold in Korea have to carry a label that displays information of two performance criteria: rolling resistance and wet grip. The rolling resistance of the tyres determines their fuel efficiency grading, and the wet grip of the tyres determines their braking safety grading. The rolling resistance and wet grip measurements must be reproducible, so the same tests on the same tyres in different laboratories must produce the same results to ensure a fair comparison between tyres from different suppliers. In addition, a good reproducibility of testing results prevents market surveillance authorities from obtaining results different from those provided by suppliers when testing the same tyres. The laboratory alignment procedure for the rolling resistance measurements was developed and published as the EU Commission Regulation No. 1235 in 2011. However, the laboratory alignment procedure for the wet grip measurements has not yet been developed. Therefore, there are many differences in the wet grip test results among test laboratories throughout the world. The new procedure that is proposed for the wet grip measurement alignment for tyre testing laboratories can improve the reproducibility of the wet grip testing results, and five laboratory alignment tests were carried out between KATECH and five other test laboratories in the world to evaluate the results of the proposed procedure.
Highlights
As an effort to reduce exhaust gas emission of the transportation, the improvement of tyre energy efficiency is required
The proposed wet grip laboratory alignment procedure was verified through five laboratory alignment tests
The tyre labelling system has been enforced by European Parliament and EU Council since November, 2012 [3] as well as by European tyre label indicates the grade of three performance parameters such as rolling resistance, wet grip and outside rolling noise
Summary
As an effort to reduce exhaust gas emission of the transportation, the improvement of tyre energy efficiency is required. All tyres sold in Korea have to carry labels with information about two performance criteria (rolling resistance, wet grip). Average PBFC is increased by 2.4% with excellent wet grip will have shorter braking some tread wear as shown in Fig. 2 [6]. Measurement of rolling resistance and wet grip for these tyre labels must be reproducible; tests. N on the same tyres in different laboratories must produce the same results in order to ensure a fair comparison between tyres from different suppliers. There are a lot of differences of wet grip test results among the test laboratories in the world. A of test laboratories with regard to the measurement of tyre wet grip is proposed in order to improve the reproducibility of the wet grip testing results. R laboratory alignment procedure was verified through five laboratory alignment tests between KATECH and five test laboratories in the world
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