1 Series E81 130i (N52K) 3-door
Note: On vehicles without active steering.
Option 216 "Servotronic" is not available without Active Steering.
Note: On BMW 3-Series not with trailer coupling.
Active Steering is not available in conjunction with option 3AC "Trailer coupling with folding ball head".
New for the BMW 3-Series was:
-
Yaw moment compensation as additional function
-
Output stages for the Servotronic valve and the ECO valve are integrated into the Active Steering control unit
-
Only 1 DSC sensor (redundant)
New for the BMW 5 and 6-Series from 09/2005 was:
-
Active Steering control unit taken from BMW 3-Series
-
This allows the Servotronic valve and the ECO valve to be directly actuated by the Active Steering control unit
-
Only 1 DSC sensor as on BMW 3-Series
Note: On BMW 5 and 6-Series vehicles without Active Steering from 09/2005.
With option 216 "Servotronic", the body gateway module (KGM) actuates the Servotronic valve.
A conventional steering system inevitably constitutes a compromise:
on the one hand, the steering cannot be too direct as otherwise it would be overly sensitive when the vehicle is
travelling at high speed. On the other hand it is practical to have much more direct steering for manoeuvring at low
speeds and for parking. The new Active Front Steering system is the ideal trade-off. The directness of the steering of
a vehicle fitted with AFS varies with speed.
This results in three major benefits:
-
enhanced agility
-
enhanced comfort
-
enhanced safety
Enhanced agility
Up to about midway through the speed range (about 100 km/h), the directness of the steering means that the
driver perceives the vehicle as more agile and easier to handle. A driver who has to avoid an unexpected
obstacle, say, has much better control, plus significantly enhanced steering precision and less work at the
steering wheel. There is no loss in feedback from the road surface right through the steering wheel.
Enhanced comfort
Current BMW models need more than three full turns of the steering wheel in order for the wheels to describe
the arc from full lock in one direction to full lock in the other.
When the vehicle is travelling at low speed, Active Steering reduces this to less than two full turns of the steering
wheel from lock to lock.
The advantage: The driver's task is easier when turning corners in city traffic or when manoeuvring into parking
slots where space is at a premium. On twisty roads such as mountain passes, moreover, the reduced steering
angle means that the driver's hands remain in the ideal position on the wheel. There is no longer any need for
the driver to feed the wheel through his or her hands, or to cross hands in a tight bend. The multifunction buttons
on the steering wheel and the paddles for the sequential manual transmission (SMG) are always perfectly
positioned relative to the driver's hands, regardless of the driving situation.
Enhanced safety
A completely different set of conditions applies when the vehicle is travelling at high speed:
With the assistance of indirect steering there is increased stability when travelling straight ahead at high speeds
(such as on motorways) compared with conventional steering. At the same time, the yaw-rate control is in the
SBT Active Steering E60, E61, E63, E64, E70, E81, E87, E90, E91, E92, E93
BMW AG - TIS
22.01.2013 13:21
Issue status (12/2007) Valid only until next DVD is issued
Copyright
Page - 2 -
