Patent ID: 7278947

Claim:
A motor vehicle, comprising: a powertrain operable to generate drive torque; a first driveline having a first shaft driving a pair of first wheels; a second driveline having a second shaft driving a pair of second wheels; a power transfer unit for transmitting drive torque from said powertrain to said first and second shafts, said power transfer unit including a differential, first and second planetary gearsets and first and second mode clutches, said differential having an input component driven by said powertrain and first and second output components, said first planetary gearset having a first gear element coupled for rotation with said first shaft, a second gear element driven by said first output component and a third gear element in constant mesh with said first and second gear elements, said second planetary gearset having a fourth gear element coupled for rotation with said second shaft, fifth gear element driven by said second output component and a sixth gear element in constant mesh with said fourth and fifth gear elements, said first mode clutch is operable for retarding rotation of said second gear element so as to increase the rotary speed of said first gear element, and said second mode clutch is operable for retarding rotation of said fifth gear element so as to increase the rotary speed of said fourth gear element; and a control system for controlling actuation of said first and second mode clutches.