Audi A6 Saloon | A6 Avant | A6 hybrid | A6 ... - Audi South Africa
Audi A6 Saloon | A6 Avant | A6 hybrid | A6 ... - Audi South Africa
Audi A6 Saloon | A6 Avant | A6 hybrid | A6 ... - Audi South Africa
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54 quattro®/quattro® with sports differential<br />
Why only use two wheels<br />
when a car has four?<br />
The quattro® permanent all-wheel drive.<br />
quattro is a permanent all-wheel drive system.<br />
If the wheels on one axle of the vehicle lose grip<br />
on the road and threaten to spin, then the drive<br />
force is transferred to the other axle –<br />
automatically and permanently distributed<br />
through the centre differential. The basic<br />
distribution is 40 : 60 – 40 % of the drive force<br />
comes from to the front axle, 60 % to the rear.<br />
The benefit is better traction during acceleration<br />
and improved safety due to exceptional grip. So<br />
much for the technology. But what makes quattro<br />
unique is really the driving feel. “As if you’re stuck<br />
to the road,” some customers say. We put it like<br />
this: quattro gives you more feel for the road and<br />
thus increased safety.<br />
The optional quattro® with sports differential<br />
further reinforces this unmistakeable quattro<br />
feeling. Vehicles tend to understeer when steering<br />
or driving into corners. This is a normal physical<br />
process: a moving object opposes a change in<br />
direction. The elastic tyres and the suspension<br />
mounts tense up until the new direction has been<br />
adopted. When accelerating into a corner, the load<br />
on the front axle is reduced and it therefore<br />
transfers less lateral force to the tyres – the vehicle<br />
understeers. With the sports differential on the<br />
rear axle, this tendency is largely counteracted.<br />
This is because the quattro rear axle differential<br />
has been extended left and right by a clutch<br />
system with two gear levels. They ensure that the<br />
individual wheels on the rear axle receive different<br />
levels of torque. The clutches are activated by an<br />
electrohydraulic actuator. Depending, for example,<br />
on the steering angle, lateral acceleration, yaw<br />
angle and driving speed, the system calculates the<br />
right distribution of wheel torque for any driving<br />
situation. In this way the power is specifically<br />
channelled to the outer rear wheel when steering<br />
or accelerating into a corner. The effect: the vehicle<br />
is effectively pressed into the corner by the drive<br />
force and follows the angle of the front wheels.<br />
The variable left and right drive forces also help<br />
stabilise the steering and the usual steering<br />
corrections are hardly necessary.