How Audi Quattro AWD Works

Here's a look inside Audi's Quattro AWD system and how it works!

The AWD system in Audi's differs from many other vehicles in that it dynamically reacts to changes in axle speed between front to rear. This is all done mechanically in the center differential located in the transfer case at the back of the transmission.

In this video, the transmission from a 2012 Audi Q5 is torn down to see how this system works. It consists of a limited slip center planetary differential. The key is it uses a clutch material between the ring gear and planet carrier which engages through the axial forces in the gears as they speed up. This clutch is only allowed to slip when wheel speed differences are relatively low, such as turning a corner; other than that, the Quattro system provides a 50/50 torque distribution from front to rear.

More advanced systems use a torsen type differential or a clutched based system to disengage an axle when not in use. FWD models use a haldex unit to send power to the rear wheels when required.

In contrast, here's how Subaru's AWD system works:
   • How Subaru AWD Works  

Here's how other RWD based AWD cars work:
   • How Does AWD Work?  

Here's how 4WD Jeeps work:
   • How Jeep 4WD Works  

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