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Hybrid whirring sound

1830 Views 2 Replies 2 Participants Last post by  Mrchips0401
Curious about Ford’s hybrids (Escape, Fusion,Explorer?) do they make a whisper whirring sound when fully engaged? I live in a community with lots of different hybrids and notice all of them have a slightly different whirring sound. And does the hybrid deploy 100% function when at consistent slower speeds (Under 35 mph) ?
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The electric motor itself makes a little bit of a whirr. Also as of 2020 NHTSA requires hybrid and electric vehicles to have an audible pedestrian warning below ~30mph.

Hybrid function (switching between ICE and electric) works at pretty much all speeds up to about 80mph. There's a lot of factors in play but throttle/horsepower demand and battery state of charge are the two primary ones.
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