Basic Function Of Automatically Controlled All-Wheel Drive - GF28.00-P-9900A

Model all (CAR) 

Overview 

This document contains information on:

• General 
• Function 

General 

In comparison to front or rear wheel drive, all-wheel drive forwards the drive force to all wheels, which in turn increases the traction and leads to improved off-road capability.

During all-wheel drive, the drive force is passed on to all wheels in contrast to with front or rear wheel drive.

Function 

Automatically controlled all-wheel drive on vehicles with transversely mounted engine and dual-clutch transmission 

The power take-off distributes the torque to the rear axle and is integrated into the dual-clutch transmission. The torque is output to the rear axle variably depending on the driving situation and the wheel slip of the front wheels. The power take-off compensates differences in rpm between the front and rear wheels which occur in all-wheel mode while cornering.

Depending on the following situations, torque is distributed to the rear axle:

• Dynamic cornering
• Wide open throttle acceleration
• Extremely varying road surfaces

Automatically controlled all-wheel drive on vehicles with longitudinally mounted engine and automatic transmission 

In the case of vehicles with longitudinally mounted engine and transmission, the torque distribution is predefined by the transfer case. Active-selective brake application takes over the function of the differential lock and vehicle dynamics control. The automatically controlled all-wheel drive is a permanent all-wheel drive with fixed force distribution.

	Additional basic functions
	Basic function of all-wheel drive with dual-clutch transmission	Model 177	GF28.00-P-1000A
	Basic function of all-wheel drive with automatic transmission	Model 167	GF28.00-P-1001A