Four-Wheel Drive Systems
E215177
1
2
3
4
5
Transfer case (power transfer unit)
1
Hydraulically actuated clutches
2
TWINSTER® rear drive unit
3
AWD electronic control unit
4
3-piece drive shaft
5
AWD (all-wheel drive) with Dynamic
Torque Vectoring
The Focus RS is offers a new level of handling
capability and driver enjoyment with Dynamic Torque
Vectoring, which combines outstanding traction and
grip with exciting agility and cornering speed.
Dynamic torque vectoring use all four wheels to power
the vehicle and independently control the torque to each
wheel.
The system also has the ability to over speed the outside
rear wheel while cornering, this increases traction and
handling performance giving the vehicle handling
capabilities that are superior to conventional two-wheel
drive and four-wheel drive vehicles. The system is active
all the time and requires no input from the driver.
The system comprises of two elements:
•
Torque vectoring control - Automatically applies
brake torque on the inner wheel in a curve to increase
traction and decrease understeer
•
Cornering understeer control - Automatically
controls the traction response of the vehicle under
braking and acceleration on high and low friction
surfaces
Unlike electronic stability control, enhanced torque
vectoring control does not slow the vehicle. The system
limits excessive wheel slip giving greater cornering
agility.
NOTE: The system does not disable enhanced torque
vectoring control if the stability control system or
traction control system are switched off.
The AWD system uses two electro-hydraulically
controlled clutch packs on each side of the rear drive
unit to apply torque to the rear wheels.
(G1821787)
Service Training
52
Lesson 3 – Powertrain
Four-Wheel Drive Systems
