Extensive tests of rolling resistance are planned for May 2014. The measurements will be performed at the MnRoad Facility (USA)

Tests of rolling resistance of conventional tyres and tyres designed for Electric Vehicles were perform at the MnRoad Facility in Minnesota, USA. The results will be evaluated during summer.

Tests of rolling resistance and noise emission of Electric and Hybrid cars will be performed in Sweden in August 2014.

During week No 42 research team from SINTEF performed road measurements  of tyre/road noise with CPX trailer on selected test sections in Norway and in week No 43 performed similar measurements in Poland. The measurements included experimental poroelastic road surface PERS laid near Cracow.

SINTEF has performed measurements of 11 passenger car tyres on 7 different road surfaces in Norway and on 7 surfaces in Poland. The road surfaces included normally used SMAs in both countries and some low noise test surfaces, like the experimental poroelastic road surface – PERS, in Krakow. This road surface was laid within the EU project PERSUADE (however, already removed due to technical problems with the surface).

The tyre range included one tyre specially designed for electric vehicles (Michelin Energy E-V) and one OE-tyre (Dunlop ENASAVE 2030) for the Mitsubishi i-MiEV (rear tyres).

The measurements were done by using the CPX trailer of the Norwegian Public Roads Administration. Tyre pressure and load of the trailer were according to the regulation ECE Reg.117.

The measurements were done at 50 and 80 km/h, if posted speed allowed.

The results show that the difference between the tyre with the highest noise level on the noisiest road surface (SMA16) and the quietest tyre a double layer porous surface was nearly 11 dB. If the PERS are included in the comparison, the difference is around 15 dB. Within the same surface the range in noise levels varies from 2.3 to 3.7 dB. The Dunlop ENASAVE was the quietest tyre on most of the road surfaces. This tyre has also the most narrow width, 175 mm.

The main results from the experiments will be presented at Euronoise 2015 in Maastricht May 31st to June 3rd.