(Acoustic Vehicle Alerting System) Speaker, Generates alert sound at low driving speed for new‑energy vehicles to warn pedestrians. Mandatory safety component by regulation.
The AVAS speaker is a mandatory safety‑related acoustic component for battery‑electric, hybrid and fuel‑cell vehicles. Unlike interior infotainment loudspeakers, it is installed in exterior vehicle zones and generates artificial driving noise at low speeds, compensating for low tire‑road noise of silent‑running EVs. Global regulatory frameworks impose strict constraints on sound pressure level, frequency spectrum and speed‑linked sound variation, which makes AVAS a typical vehicle‑grade safety actuator rather than ordinary consumer audio hardwareFORVIA HEL….
Top 10 Global Brands
Hella, Bosch, Continental, Marelli, Valeo, Denso, Panasonic, Amphenol, Sonion, Bose Automotive. These international tier‑one suppliers deliver split‑type and integrated AVAS modules for global OEMs, complying with ECE R138, FMVSS‑141 and other regional pedestrian‑alert regulations.
Top 10 Chinese Domestic Brands
Sheng Electronics (Shengdian), GoerTek, AAC Technologies, MEMSensing, Changzhou Yueda Acoustics, Guoguang Electric, Haon Acoustics, Kepo Tech, Suzhou Good‑Ark, Wanji Technology. Domestic manufacturers realize mass‑volume supply for Chinese new‑energy‑vehicle platforms, supporting multi‑region regulatory adaption for export‑oriented projects.
Structural Composition
AVAS speaker products fall into split‑type and integrated configurations. Split‑type assemblies contain acoustic speaker unit, sealed acoustic cavity, damping sound‑absorbing foam, waterproof housing and vehicle connectors. Integrated AVAS modules embed additional class‑D power amplifiers and DSP audio processing chips. Vehicle VCU transmits vehicle‑speed and gear‑position signals over CAN bus to drive the speaker, producing speed‑dependent warning sound complying with regulatory spectrum requirements.
Application
Generates alert sound at low driving speed for new energy vehicles to warn pedestrians. Mandatory safety component by regulation. Chinese market follows GB/T 37153‑2018 standard while European market applies ECE R138. Warning sound is triggered during forward and reverse travel below 20 km/h to offset safety risks caused by quiet EV operation. The acoustic output fades automatically once vehicle speed exceeds regulatory threshold.
Manufacturing Challenges
Frequency‑response curve must strictly match regulatory spectrum envelopes, and sound‑pressure level shall stay within legal boundaries. Acoustic‑parameter drift is restrained across full automotive temperature range from ‑40 ℃ to 85 ℃. Housing achieves IP67 or IP6K9K ingress‑protection rating. Cavity sealing eliminates acoustic leakage. Anti‑vibration and anti‑shock design avoids abnormal noise under road excitation. Amplifier‑speaker matching suppresses audio distortion. EMC anti‑interference guarantees stable CAN‑bus communication. Firmware sound‑effect version control supports multi‑country regulation switching.
Required Quality Documents
IATF16949 certification, APQP documents, DFMEA / PFMEA risk‑analysis report, production control plan, full‑set PPAP submission, acoustic‑performance test report, high‑low‑temperature acoustic‑drift test report, vibration‑shock endurance report, IP‑protection‑grade verification report, EMC validation report, regulatory certification documents for GB/T 37153 and ECE R138, IMDS material‑data sheet, RoHS and REACH compliance certificates.
Impact on Vehicle Performance
AVAS is a statutory safety‑relevant component. Speaker or amplifier failure leads to total loss of warning sound, triggering vehicle diagnostic trouble codes and non‑compliance against legal requirements. Deviated frequency response or sound‑pressure level brings potential recall risks. Cavity leakage causes sound distortion and insufficient output volume. AVAS malfunction will not directly damage powertrain driving capability, yet it determines whole‑vehicle regulatory compliance and pedestrian‑safety performance, serving as essential physical complement for ADAS pedestrian‑warning functions.