One of the challenges in the development of hybrid and electric vehicles is the interior and exterior noise refinement: for interior noise, the absence of masking by the internal combustion engine during EV operation may be critical due to the appearance of noises that the customer is not used to hear (e-compressor, cooling pumps, electro-hydraulic actuators etc.). On the other hand, the absence of ICE noise may be an opportunity for designing artificial sounds that could be seen as an added value for improving customer’s driving experience, perhaps whilst also providing some additional masking of unwanted noise.
For the above reasons, brand requirements and a deep understanding of customers’ expectations, may be the most relevant key factors for interior noise development. In addition to this, the new homologation standards for exterior noise leave some design space for a “brand customization” of AVAS.
Although these sounds are not directly connected with the mechanics of the powertrain, nevertheless their link to vehicle’s CAN bus parameters (speed, “gas pedal” position etc.) is crucial for a satisfying driving experience.
In this work, an approach has been developed for designing artificial interior noise and AVAS sound for a sporty version of the 500e, where both interior and exterior sounds have been prototyped in an NVH Simulator, allowing nearly all sound prototyping and test work to be accomplished quickly, easily, and efficiently.
The entire process, from the on-track assessment of a “sporty sound” key features, passing through the virtual sound’s assessment inside a listening room, to the final delivery of the demo vehicle for jury testing and type approval measurements, is here described.
This approach has then been extended to include the use of panel transducers (PT) to deliver the AVAS sound. PT have the advantage that they are much smaller to package and can even deliver lower frequencies than the small loudspeakers typically used for standalone AVAS sounders. A method for using PT to deliver AVAS is also presented.
A Method for Designing and Delivering Interior and Exterior Noise of an Electric Vehicle
Proceedings
2020-01-24
17 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Deutsch
VEHICLE INTERIOR/EXTERIOR ARTICLE AND PRODUCTION METHOD OF VEHICLE INTERIOR/EXTERIOR ARTICLE
Europäisches Patentamt | 2022
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