Resolving NVH of hybrid vehicles: focussing on improved Noise, Vibration & Harshness

Knowledge Hub
Automotive Performance Engineering

Powered by

Resolving NVH of hybrid vehicles: focussing on improved Noise, Vibration & Harshness


A significant amount of advancements are taking place to address NVH performance, noise reduction and adhering to noise level standards

The area of vehicle NVH and acoustics are witnessing significant advancements. And among alternate fuel technologies hybrid vehicles are considered a good option. From the vehicle (NVH) perspective, hybrid vehicles are widely known to carry a disturbing vibration noise. These hybrid vehicles restart their engines without any driver casual action like shifting gears. Further, an engine restart happens entirely on the car’s terms, rather than on those of the driver and there is an element of surprise that can render an experience even more unpleasant than it would be. It may be pertinent to mention that there is a significant amount of development work happening globally, especially in Japan where original equipment manufacturers (OEMs) specialising in hybrid and electrified powertrains are looking at newer ways to address noise, vibration and harshness (NVH) issues that go hand-in-hand with the restart technology. The automotive validation and verification provess is also witnessing significant advancements.

Slowly but surely, the Western world is becoming familiar with cars going into sleep mode when idling − for example, while stopped at a traffic light. Engine start-stop systems (also called idling stop) have been quite common for a solid decade now, and their presence probably will keep growing. The first systems date back to the early 1980s, with the release of the Volkswagen Polo Formel E. in 1983 (in Europe only). Interestingly, disturbing vibrations at engine restart are the reason that start-stop systems didn’t quite catch on back then, and are still an impeding factor for widespread adoption today.

View This Asset