Electric vehicles prescribed noise

10 June 2019

System AVAS obliged electric vehicles in Europe to give the noise level of 56 decibels at speeds up to 20 km/h

The first of July will be in the European Union the start date for new rules requiring manufacturers of electric vehicles and hybrids to provide acoustic alerting system AVAS (Acoustic Vehicle Alert System). As electric cars move at low speeds virtually silently, they will have up to a speed of 20 km/h to denote the presence on the road artificial noise levels of 56 dB to prevent pedestrians and cyclists. However, this continuous sound to change the tone during acceleration and deceleration. The American company Harman International Industries since 2009 working on the implementation of AVAS and now hopes to begin to reap the benefits of its wide application.

By the way, the volume level is 56 dB corresponds, for example, small but quite Kishimoto conversation or the sound of household appliances. However, it is not yet clear about hybrids or supposed to make noise all the time or only when driving on pure electric.
Accordingly, the system is called Harman HALOsonic. Moreover, the proposed two subsystems: eESS (external Electronic Sound Synthesis) and iESS (internal Electronic Sound Synthesis). The first of these transmits the noise to the outside, the second cabin.
In the video, you can evaluate the work HALOsonic on dorestaylingovyh the electro hatchback costs Tesla Model S
Many automakers have already developed individual "soundtracks" for their electric vehicles, for example, for the individuality of the brand or the sporty character of the model.
So, the Nissan brand has introduced in 2017 on the concept of IMx the sound is called Canto ("I sing"), quite different from the usual sound of the engine.
The Harman HALOsonic gives an idea of the work AVAS. The front and aft of the machine built according to one speaker, and the control modules are installed in the cabin or under the hood. One sensor monitors the gas pedal, the other measures the speed. The front suspension also provided a pair of accelerometers. The driver receives (optional) audio feedback through the speakers.

PS it was Interesting to hear "the diesel voice" of the Tesla. Perhaps not necessarily as a warning signal to put it is the noise of the engine – if only he was visible pedestrians and cyclists, but the conditions were not good people beyond the immediate roads. Again, the question is whether it is necessary to generate noise continuously, or only when close to pedestrians – probably until it is necessary to continuously, and with the development of systems to detect pedestrians and always.