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Pass-by Noise Generating System in Battery Electric Vehicle
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on September 25, 2020 by SAE International in United States
Event: International Conference on Advances in Design, Materials, Manufacturing and Surface Engineering for Mobility
Battery Electric Vehicles (BEVs) are getting acceptance all around the world. India is not far behind in terms of EV sales. BEVs run on electric motors and don't have Internal Combustion based engines that generate significant noise while running. The engine noise is one of the major reasons for noise pollution, but it is useful in alerting the pedestrians about the incoming vehicle and can function as a passive safety system. The lack of such noise can be a safety threat to pedestrians, cyclists, wildlife etc. Many countries around the world have mandated a pass-by noise generating system to alert pedestrians of the incoming vehicle. Certain regulations proposed in the developed countries mandate that BEVs emit noise of about 50 dB at very low speeds (less than 20kmph). This paper is an attempt to study various pass-by noise generating systems used worldwide in electric four-wheelers and the level of sound output they can create. Most of the systems use speakers located on the exterior of the cabin to mimic noise generated by IC engines. This paper describes a detailed comparison of the pseudo-sound generating devices, enlists pros & cons of each system and also suggests an ideal pass-by noise generation system considering Indian road conditions. In the future, this paper can be used as a reference for the development of pass-by noise generating system.