Within the framework of the United Nations ECE a new measurement method has been developed for the type approval of road vehicles with respect to their exterior noise emission. For passenger cars the operating conditions of the new test are changed significantly compared to the existing test. Also the ranking of noise sources has changed from predominantly propulsion noise to a significant amount of tyre/road noise. With this change a more effective reduction will be possible of the equivalent traffic noise as emitted during cruising on main streets. Currently another new test method for passenger cars, called ASEP (Additional Sound Emission Provisions), is under development. This second new method covers a broader range of operating conditions, including worst case acceleration events. This method is designed to safeguard the achievements of the past in the area of single events and propulsion noise reduction. The combination of the two new test methods will enable more effective noise reduction of road vehicles. With the current place holders for limit values the two new method may face a serious stringency issue. Vehicles may be allowed to become more noisy. To overcome this, the Netherlands has drafted an alternative ASEP method, which is also more design neutral.
Additional Sound Emission Provisions in the new European type approval method for exterior noise of road vehicles
2009
7 Seiten, 3 Bilder, 7 Quellen
Conference paper
English
Improvement of the type approval noise limitation for motor vehicles
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