Too much body roll is never a good thing. To tighten things
up further, Audi has introduced a system featuring two electronic sway bars to
nearly eliminate body roll.
And who would be better to give us a walkthrough on how the
system actually works than Jason Fenske of Engineering Explained. In the
video, Jason breaks down how the electronic sway bars work to stop body roll
and keep the Audi
SQ7 SUV flat through a corner.
Audi's system isn't new or groundbreaking, but the fact the
brand has paired it with a 48-volt system for
more power and control is certainly interesting.
When a car takes a corner, let's say a left, the body will
roll into the corner and the suspension will compress down into the driver's
side. Audi's system uses an electric motor to provide up to 900 pound-feet of
torque to counter the motion.
The torque allows the electronic sway bar to twist and push
the wheel away from the body as the body tries to compress down. Meanwhile, the
system will compress the opposite side as it begins to separate in an opposite
reaction.
The entire action happens as the system reads the driver's
steering input and vehicle speed to provide the appropriate amount of torque.
But, that's not all the system can do. Audi's electronic
sway bars can also help control understeer and oversteer in real time. Sway
bars help determine under and oversteer and stiffer units will cause more or
less. With the electronic units, Audi's system can help distribute the load
between tires for a more neutral cornering experience.
We should note that absolutely zero body roll feels completely
unnatural. In fact, Bentley's body control system was so effective in
eliminating body roll in the Bentayga, a close relative of the Q7, that
engineers had to dial it back.
source: https://www.motorauthority.com/news/1116235_heres-how-audi-is-eliminating-body-roll
by Sean Szymkowski
http://www.boscheuropean.com
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