The evolution of Kepo AVAS integration in electric and hybrid vehicles has occurred in several areas：
Sound Design
- Internal Combustion Engine Simulation:Early AVAS systems primarily relied on simulating the sound of an internal combustion engine to alert pedestrians to the vehicle’s presence. While this approach was straightforward, it lacked personalization and distinctiveness.
- Customized Soundscapes:As technology advanced, more automakers began customizing unique AVAS soundscapes for their models to enhance brand identity.
- Sound Optimization:Engineers have extensively optimized sound parameters such as frequency, volume, and waveform to ensure AVAS sounds are clearly audible in various environments, maximizing the system’s effectiveness.
Speaker Placement
- Front-Mounted Speakers:Initial AVAS systems typically featured speakers mounted on the vehicle’s front to directly alert pedestrians ahead.
- Multi-Speaker Systems:To improve sound coverage and directionality, some high-end vehicles have adopted multi-speaker systems with speakers distributed throughout the vehicle.
- Active Noise Cancellation:To minimize AVAS sound intrusion into the cabin, some models employ active noise cancellation technology, using additional in-cabin speakers to generate sound waves that counteract the AVAS sound.
Integration with Other Vehicle Systems
- Speed Control:AVAS systems are usually linked to the vehicle’s speed sensor to automatically adjust sound volume and frequency based on vehicle speed.
- Driving Modes:Certain vehicles allow drivers to select different driving modes, and the AVAS system can adapt its sound characteristics accordingly.
Global Overview
While regulations vary by country, there’s a general trend towards implementing AVAS mandates.
Europe: The European Union has implemented regulations requiring AVAS for all new electric and hybrid vehicles under 20 km/h or when reversing.
United States: While there’s no federal mandate, several states have introduced their own AVAS regulations or are considering them.
Asia: Countries like Japan, China, and South Korea have adopted AVAS regulations, aligning with global safety standards.
Other Regions: Many other countries are following suit, implementing AVAS requirements to enhance road safety.
Kepo AVAS System：
Kepo’s Acoustic Vehicle Alerting System (AVAS) is a customizable sound system specifically designed for electric, hybrid, and fuel cell vehicles. It provides tailored acoustic solutions for various vehicle types, including passenger cars, commercial trucks, and public buses.
The AVAS system receives data about the vehicle’s speed and gear from the vehicle’s computer system via a CAN bus connection. This information is then processed by the system’s main control unit, which selects and adjusts pre-recorded sounds from its internal memory to create a realistic engine-like noise. This sound is emitted to alert pedestrians and other road users of the approaching electric vehicle.
Kepo Acoustic Vehicle Alerting System (AVAS) offers exceptional flexibility in sound frequency, lightweight design, Standard or extreme temperature and IPX tolerance (-40°C to 85°C, extending to -40°C to 90°C), and can achieve sound pressure levels of up to 87 dB, with IP67-IP69 ability based on customer prefer and budget.
Products
| Item | Specification |
| Impedance | 8Ω±15% |
| Sound Pressure Level | 81dB±3 dB(W/M ) |
| Resonance Frequency | 180Hz ±20% |
| Frequency Range | Fo ~5KHz |
| Input Power | Rated 3W / Max.5W |
| Distortion | 1.2 f0＜f≤500Hz时：≤5% |
| Buzz and Rattle | Should not be audible buzzes, rattles when the 4V sine wave signal swept at frequency range. |
| Polarity | When supplied plus D.C. voltage to (+) terminal, the cone diaphragm must move to forward. |
| Operating Temperature range | -40℃ +85℃ |
