Electric Vehicle Sound technology
Sound for increased safety
The silence of electric vehicles is highly appreciated by most drivers, passengers and people outside the vehicle. But in some situations a warning sound is required in order to increase safety for people in front of the vehicle. SoundRacer EV Sound is designed to help EV manufacturers meet the legislation’s for pedestrian warning sound, AVAS.
Sound for enhanced driving experience
Many drivers actually appreciate the exciting sound of a powerful combustion engine when driving. An entertaining electronic engine sound system can then make the electric vehicle more attractive to buy and drive. The sound can be switched on and off at will and the volume can be adjusted to an appropriate level for every situation. SoundRacer EVS delivers an outstanding User Experience, UX, and is a perfect Experience Design, XD, tool for electric vehicle developers.
SoundRacer AB is a leading manufacturer of electronic engine sound devices. With 180 000 units sold and 8 years of development we are a competent supplier of sound technology for improved driving experience and safety in ICE as well as electric vehicles.
In USA, the Pedestrian Safety Enhancement Act that the National Highway Traffic Safety Administration (NHTSA) proposed on July 7, 2011 is ”the first major step towards regulations that will protect unsuspecting pedestrians and the visually-impaired from accidents involving hybrid and electric vehicles.” “The alert sound must not require activation by the driver or the pedestrian, and must allow pedestrians to reasonably detect an EV or HV in critical operating scenariossuch as, but not limited to, constant speed, accelerating, or decelerating. Sound specifications would include criteria for sounds to be detectable and recognizable as the sound of a motor vehicle in operation. “ More info on US legislation below. US regulation
European Parliament legislative resolution of 6 February 2013 on the proposal for a regulation of the European Parliament and of the Council on the sound level of motor vehicles: ”Manufacturers shall install AVAS in vehicles. The sound to be generated by the AVAS shall be a continuous sound that provides information to pedestrians and vulnerable road users of a vehicle in operation. The sound shall be easily indicative of vehicle behaviour and should sound similar to the sound of a vehicle of the same category equipped with an internal combustion engine, and operating under the same conditions, and the requirements of Annex IX shall be fulfilled.” ” The sound to be generated by the AVAS must be easily indicative of vehicle behaviour and direction of travel , for example, through the automatic variation of sound level or characteristics in synchronization with vehicle speed.” More info on EU legislation below. EU regulation
Japan: “In January 2010 the Ministry of Land, Infrastructure, Transport and Tourism in Japan issued guidelines for hybrid and other near-silent vehicles. It is found that warning sounds with similar characteristics as engine sounds are the best countermeasures against these risks“
See also United Nations Regulation No. 138 below.UN regulation
The main idea with the warning sound is that a person at risk should immediately perceive the situation and be able to take the right action in order to avoid a dangerous situation. A realistic engine sound will have that effect while a synthetic sound need to be analyzed first, causing a delay that can be fatal.
The SoundRacer technology is developed to give a realistic sound impression indicating if the vehicle is idling, accelerating, decelerating or cruising. The different sound characters and sound volume is determined from information about the actual speed of the vehicle and rate of speed change.
The sound will give people in the surrounding the best possible chance to determine the behavior of an approaching electric vehicle.
As a result, the sounds will also be less likely to be disturbing compared to adding new types of synthetic sounds into the traffic environment.
We have solid experience in this field and look forward to develop sound solutions together with electric vehicle manufacturers.
SoundRacer technology is used in electric karts for improved driver entertainment. Electric carts can have several benefits compared to ICE karts, one of them is environment.
We have also delivered sound modules to home build electric sports cars, ICE cars converted to electric, electric motorcycles, electric scooters and electric children carts.
We receive many emails that shows that the silence of electric vehicles is not always appreciated
The sound system can be installed in even the smallest electric vehicles, see this YouTube video with the demo car we made for the CeBIT 2013 trade fair in Hannover, Germany.
Gizmag wrote ”SoundRacer puts some big sounds in a small package” and New Atlas wrote ”Soundracer gadget makes a Tesla sound like a Shelby V8 (or whatever else you like)”
The SoundRacer EV sound system is tested by the RISE cerified test institute in Sweden and found to produce sound pressure levels above the minimum levels in the regulations. Test protocol pdf with our comments kan be found here.
COMMISSION DELEGATED REGULATION (EU) 2017/1576
of 26 June 2017
amending Regulation (EU) No 540/2014 of the European Parliament and of the Council as regards
the Acoustic Vehicle Alerting System requirements for vehicle EU-type approval
Here are some texts from the document, full document is available in several languages here
(2) Following the adoption, at the 168th session of the World Forum for Harmonization of Vehicle Regulations of the United Nations Economic Commission for Europe (UNECE), which took place on 8 — 11 March 2016, of UN Regulation 138 on the approval of quiet road transport vehicles, Annex VIII to Regulation (EU) No 540/2014 should be reviewed in order to improve the accuracy of the AVAS requirements on type and volume of emitted sound, the sound generation method, the pause switch and stationary sound.
II.2. Operation conditions
(a) Sound generation method The AVAS shall automatically generate a sound in the minimum range of vehicle speed from start up to approximately 20 km/h and during reversing.
II.3. Sound type and volume
(a) The sound to be generated by the AVAS shall be a continuous sound that provides information to the pedestrians and other road users of a vehicle in operation. The sound should be easily indicative of vehicle behaviour and should sound similar to the sound of a vehicle of the same category equipped with an internal combustion engine.
(b) The sound to be generated by the AVAS shall be easily indicative of vehicle behaviour, for example, through the automatic variation of sound level or characteristics in synchronisation with vehicle speed.
III.3. Sound type and volume
(b) The vehicle manufacturer may provide for the possibility for the driver to select from among different sounds, which shall comply with the requirements laid down in paragraph 6.2.5 of UNECE Regulation No 138.
More info on US regulation can be found here
United Nations Regulation No. 138. Uniform provisions concerning the approval of Quiet Road Transport Vehicles with regard to their reduced audibility link to pdf