In this study, there are 5 major items: (1) study and analysis on tyre noise control regulation in Europe; (2) evaluate tyre noise contribution on acceleration noise of motor vehicle; (3) check the rule about tyre width in of choice of represent vehicle for noise type approval application; (4) survey the status of the tyre manufacturer in Taiwan; and, (5) evaluate the possibility to move tyre noise control in Taiwan. First, reviewing the studies in tyre noise, the tyre noise dominates in speed range from 50 km/h to 100 km/h. It is surely, control tyre noise helps to reduce traffic noise on highway. The second item, following CNS 5799 standard, test acceleration noise and coast by noise of sedan, pickup, heavy truck and bus. In this working item, the noise emitted from vehicle under low engine load cruise status is also tested. The results show that: (1) for tested bus, tyre noise is 4 ~ 5 % in acceleration noise; (2) for tested heavy duty truck, tyre noise is 7 ~ 11 %; and (3) for tested pickup, tyre noise is 18 ~ 21 %; (4) for 6 cars tested, tyre noise is 22 ~ 48 % in acceleration noise. Nevertheless, the noise of tyre is almost 80 ~ 100 % in cruise at 50 km/h condition. Third, following CNS 9480 to test tyre noise on dynamometer in laboratory, the test results of 109 different tyres show the positive relationships between noise and tyre width. With 11 different patterns of tyre with same nominal size, tyre noise are different in range from 4 to 5 dB(A). Surveying and studying show that the tyre noise control is helpful for reduceing the communication noise beside high way. Therefore, tyre noise control is necessary absolutely. Bureau of Standards, Metrology and Inspection, Ministry of Economic Affair, is suggested to govern the tyre noise control for most tyre sold out in after service market. Authority in Taiwan could perform the tyre noise test and the capacity of testing is also capable.

Tyre,Acceleration noise,Type approval