How Active Sway Bars Let Big Heavy SUVs Corner as Flat as Sports Cars
It's like having a super stiff anti-sway bar when you want it, and eliminating it when you don't.
Active anti-roll bars help high-riding SUVs take corners with minimal body roll. But how do they work? Thanks to this detailed explainer video, you can find out.
When a car takes a turn, its center of gravity leans to the outside, compressing the outside suspension and decompressing the the inside. An anti-roll bar, which connects both sides of the suspension across one axle, restricts the amount of differentiation the suspension can have, and thus reduces body roll.
Unlike a normal sway bar, which can't be adjusted on the fly, an active sway bar uses a motor in the center of the bar to apply opposing torque on either end. This stiffens the anti-roll bar in real time, allowing the car to correct for roll mid-corner.
A current 48-volt system is used on Audi, Bentley and Lamborghini SUVs; Mercedes and Rolls Royce use similar systems in their luxury cars. Let Jason Fenske of Engineering Explained show you the ins and outs of how active roll bars work in his latest video below, using an Audi Q7 as an example.
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