With no engine sound, the electric Jaguar I-Pace required a new way to warn blind, visually impaired and other vulnerable road users it is approaching at low speed.

Jaguar has designed a unique Audible Vehicle Alert System (AVAS) for its first EV that meets and exceeds all forthcoming global legislation. Jaguar’s engineers have developed a sound that can be heard at speeds up to 20kph and exceeds the 56dB(A) minimum required by forthcoming European legislation — the strictest in the world — for all new EVs from July 2019.

The I-Pace’s sound was tested by members of Guide Dogs for the Blind, the UK’s leading charity for people affected by sight loss, as part of the testing undertaken by Jaguar. It also marks the start of an on-going relationship between the two organisations.

Iain Suffield, Jaguar NVH Technical Specialist, said: “The absence of traditional engine noise from electric vehicles creates a problem for vulnerable pedestrians, such as the blind or visually impaired. This is especially true at low speeds in town centres and car parks. We developed the Audible Vehicle Alert System for the I-Pace to ensure the safety of all road users.”

Jaguar’s engineers worked for four years to develop a soundtrack that is audible yet discreet and cannot be heard from inside the vehicle. Engineers tested sounds in a number of environments, including an anechoic chamber (specialist echo-free room) and various urban scenarios, before settling on the final sound which is emitted from a speaker located behind the front grille and can be heard in every direction and cannot be disengaged. The alert increases in pitch and volume in line with the speed of the vehicle and, when in reverse, is accompanied by an additional tone that indicates the change in direction. AVAS is not required at higher speeds as there is sufficient wind and tyre noise for pedestrians to hear the zero-emissions vehicle approaching.

 

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