What is AVAS?

Acoustic Vehicle Alerting System (AVAS): Combating Invisible Hazards on the Roads

With the advancement of technology in today's era, the automotive industry is undergoing significant changes and transformations. The increase in the number of electric and hybrid vehicles, known as eco-friendly vehicles, has brought along with it some new safety concerns. Particularly, the silent operation feature of these vehicles can pose a danger to pedestrians and other drivers. This is where a technology comes into play, called the Emergency Vehicle Alert System (AVAS), playing a crucial role.

 

AVAS is essentially designed to alert pedestrians and other drivers about the presence of electric or hybrid vehicles, which operate silently at low speeds. This system produces external sounds or warning signals that vary depending on the vehicle's speed, informing the surrounding individuals about the presence of the vehicle. Especially in urban traffic, where parked vehicles suddenly move or move slowly, the AVAS system is of critical importance in attracting the attention of pedestrians and preventing accidents.

 

The AVAS system typically operates by emitting sound signals through speakers located in the front of the vehicle. These sounds can be low-level engine noises that vary depending on the vehicle's speed or artificially generated warning tones. Additionally, some AVAS systems may use optical signals to indicate the approach of pedestrians or other vehicles.

 

The AVAS system is designed not only with pedestrians in mind but also with visually or hearing impaired individuals. It proves to be particularly useful in urban and suburban traffic, parking areas, and places where complex maneuvers are performed.

 

In conclusion, the Emergency Vehicle Alert System (AVAS) plays a vital role in reducing potential hazards arising from the silent operation of electric and hybrid vehicles. By enhancing not only the safety of drivers but also pedestrians and other road users, this system represents one of the revolutionary steps in the modern automotive industry towards safety.

How Are AVAS Sounds Created?

Creating sounds for electric vehicles (EVs) involves the collaboration of sound designers and automotive manufacturers. These professionals work within the guidelines set by the automaker and regulations to craft distinctive auditory experiences that align with the brand's identity.

 

The sound of an EV is not just about masking its silence but also about defining the brand's character. Some car manufacturers opt for natural and serene sounds akin to wind or water, while others prefer robust and cinematic tones. Some may even seek to replicate the signature growl of their traditional gas-powered vehicles.

 

Crafting the perfect soundscape for an EV involves intricate considerations. Designers must evaluate how different sounds interact during various driving scenarios. They ponder whether these sounds complement or obscure each other, and whether they should be harmonious or discordant. Moreover, designers must be mindful of the associations people have with certain sounds. For instance, a spaceship-like sound used by Jaguar for their Acoustic Vehicle Alerting System (AVAS) had to be redesigned after causing people to gaze skyward upon hearing it.

 

To address these challenges, sound designers leverage advanced tools like Ansys Sound, which enables them to anticipate, test, optimize, and validate the active sound design for EVs. Starting from a basic set of sounds, designers can manipulate properties such as volume, pitch, and tone to craft new auditory experiences. They also analyze how sound characteristics change based on driving parameters like speed, RPM, and acceleration. By simulating these sounds in real-time through the vehicle's audio system or driving simulators, designers can refine their creations to ensure optimal performance in real-world driving conditions.