Tyre/road noise of passenger car tyres, including tyres for electric vehicles – road measurements
SINTEF ICT, Dept. of Acoustics
Tuesday 2 june, 2015, 16:20 - 16:40
0.2 Berlin (90)
In the last couple of years, electric vehicles (EV) have been more commonly used in urban traffic in some countries like Norway. Currently, there are more than 40 000 electric vehicles in Norway and about 15 % of all new vehicles sold are pure electric vehicles. Major economic and user incentives like no VAT, free use of taxi/bus lanes, free parking and charging of batteries are the main reasons for this popularity. EVs used to be rather simple and small city cars with limited driving range. Today, the most popular EVs are Nissan Leaf, Tesla Model S, VW eGolf, VW eUP!, BMW i3 and Mitsubishi i-MiEV. For some of these cars special tyres have been developed to increase the driving range, by a low rolling resistance (RR). This has been done by narrowing the width, increasing the tyre diameter and optimizing tyre tread, etc. These measures have a potential to also reduce the rolling noise. However, the measurement of RR and the noise level for type approval/labelling purposes are made in a laboratory (RR) and on an ISO track (noise). These conditions can be quite different from the conditions on the actual roads the vehicles are used on. In the Polish-Norwegian project LEO, the noise and RR from passenger car tyres, including tyres designed for EVs are investigated. The main objective is to find an optimized combination of tyre and road surface, to reduce CO2-emissions and reduce road traffic noise. This paper presents the results of CPX trailer measurements of tyres on a wide range of road surfaces in Poland and in Norway. The surfaces include normally used SMAs, double layer porous surface and an experimental poroelastic surface – PERS. Wide selection of tyres were tested including tyres of sizes significantly different from commonly found on conventional cars.
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