Abstract
Korea and EU governments are running the tyrelabelling system from 2012.All tyres sold in Korea have to carry a label displaying information about two performancecriteriasuch as rolling resistance and wet grip.The rolling resistance of tyres determines their fuel efficiency gradingand the wet grip of tyres determines their braking safety grading. Measurement of rolling resistance and wet gripmust be reproducible; tests on the same tyres in different laboratories must produce the same results in order to ensure a fair comparison between tyres from different suppliers. In addition, a good reproducibility of testing results prevents market surveillance authorities from obtaining different results from those of the suppliers when testing the same tyres. The laboratory alignment procedure of rolling resistance was developed and published as an EU Commission Regulation No. 1235 in 2011. But the laboratory alignment procedure of wet grip has not developed yet. So there are a lot of differences of wet grip test results among the test laboratories in the world. The proposed new procedure for the alignment of test laboratories with regard to the measurement of tyre wet gripcanimprove the reproducibility of the wet grip testing results. The proposed wet grip laboratory alignment procedure wasverified through five laboratory alignment tests between KATECH and five test laboratoriesin the world.
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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