Safety Hazards Due to Silence
Electric vehicles gained popularity for their eco-friendliness and energy efficiency, but their silent operation posed a significant safety concern. Pedestrians and other road users found it challenging to detect the approach of electric vehicles due to their lack of noise, leading to numerous traffic accidents. To address this issue, the Acoustic Vehicle Alert System (AVAS) was developed. AVAS systems emit sounds at low speeds, simulating the engine noise of traditional internal combustion engine vehicles or other audible alerts, to alert pedestrians and other road users to the presence of an approaching vehicle, thereby enhancing road safety.
To reduce the risk of accidents associated with the silent operation of electric vehicles, many countries mandated the installation and use of AVAS systems.
Global Regulations
From July 1, 2019, European Union Request all new energy vehicles must be equipped with AVAS systems.
Similarly, in North America, under FMVSS No. 141 standards, hybrid and electric vehicles manufactured since 2020 are also mandated to have pedestrian warning systems. In China, according to GB/T 37153 standards, new energy vehicles must install Acoustic Vehicle Alert Systems (AVAS) to emit sounds at low speeds to enhance pedestrian safety.
These regulations mandate the installation and use of AVAS systems to reduce the risk of accidents associated with the silent operation of electric vehicles, thus improving road safety.
- EU: UN R138.01
- US: FMVSS No. 141
- China: GB/T 37153
AVAS System From Kepo
Kepo’s Acoustic Vehicle Alerting System (AVAS) is a tailored acoustic warning system designed for electric vehicles (EVs), hybrid electric vehicles (HEVs), and fuel cell electric vehicles (FCEVs), including passenger cars, commercial vehicles, and public transportation, offering customized acoustic solutions for each vehicle type.
The AVAS system accepts vehicle speed and gear position signals through its CAN communication Module from the vehicle gateway. These signals will be processed by the MCU (Microcontroller Unit) which retrieves pre-stored sound data from the FLASH memory and dynamically adjusts pitch and volume to generate a lifelike engine sound, alerting pedestrians and other road users to the presence of the approaching EV.
Sound Melody Design
Kepo sound design process begins with the utilization of specialized sound design software, allowing us to edit fundamental sound source files. The versatility of our sound design enables us to create a wide range of sound profiles, whether it be the emulation of traditional internal combustion engine sounds or the development of unique, brand-specific audio identities.
Kepo employs advanced simulation software to generate calibrated data, which is subsequently utilized by the AVAS control system to drive the speakers integrated within the AVAS system. This meticulous calibration process ensures that the generated sounds align perfectly with the vehicle’s operational parameters and safety requirements.
Products
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.
Our products represent a perfect blend of cutting-edge engineering and regulatory compliance, ensuring an enhanced and safer driving environment for EVs and hybrid.
| 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℃ |
Case Highlights
Certified
·UN R138.01
·FMVSS 141
·GB/T 37153
·EMC Tested
Compact & Lightweight
·Sound Actuator
·Compact Housing
·220g Lightweight
Performance
·Low Distortion
·>90% Efficiency
·IP67 & IP6K9K
Functions
·For EV, HEV, FCEV
·CAN BUS Connection
·UDS, OTA Available
·Personalized Customization
Cost Optimization
·Modular Design
·Sound Effect/Melody Design
·Embeded Software Solution
