X Series E70 X5 3.0Sd (M57T2) OFFRD
characteristics of the vehicle.
As soon as the front wheels push unduly outward, the rear wheel on the inside of the curve will be specifically
braked by the DSC.
The resulting loss in forward drive is compensated for by an increase in engine power. Thus even on slippery
roads, curves can be taken more precisely.
Whether and to what extent intervention of this kind is required, is determined with the data on yaw rate, steering
angle and engine power.
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Active front steering
For the 3rd generation of Active Steering the following features are new:
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Yawing moment compensation has been fully integrated as a function in the Active Steering control unit
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Cumulative steering angle sensor withdrawn
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Digital motor position sensor
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Commissioning exclusively via service function in BMW diagnosis system
On the X5, Active Steering is available for the first time on an all-wheel drive vehicle.
The variable steering transmission ratio offer the optimum gear ratio for every speed. With speeds of up to
approx. 100 km/h, a very direct and agile vehicle performance is realised in conjunction with a small steering
angle.
It is hardly necessary for the driver to span the steering wheel with his hands. This means that the controls on
the steering wheel are easier and safer to control. Thus for parking you can steer from the left stop to the right
stop with only two turns of the steering wheel.
At high speeds, steering becomes increasingly indirect, thus improving the straight-running stability and the
general driving comfort.
The road speed dependent Servotronic adjusts the force required to turn the steering wheel to a reasonable
degree, while the Active Steering influences the steering angle requirement. Thus Active Steering and
Servotronic have different effects and perfectly complement each other. For this reason Active Steering is only
offered in combination with the Servotronic.
Drive stability functions:
The possibilities of Active Steering are also exploited to stabilise the vehicle in oversteering situations.
The Active Steering can countersteer more rapidly and precisely that the average driver and stabilises the car
largely automatically. Another function increases vehicle stability during braking manoeuvres on non-uniform
road surfaces (
µ
split braking). The differences in frictional coefficients result in vehicle reactions and the driver
has to compensate for these with conventional systems by countersteering.
Active Steering takes over this function and stabilises the vehicle automatically. On one hand, it is easier to stay
in control in this kind of situation and, on the other, the braking distance is reduced. This produces a tangible
increase in safety compared with an identical vehicle without Active Steering.
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Adaptive Drive
With the optional extra Adaptive Drive the following are functionally combined:
Active Roll Stabilisation Dynamic Drive (ARS = Dynamic Drive) and variable Impact Damping Adjustment (VDM
= Vertical Dynamic Management).
The integration of both systems maximises safety, comfort and responsiveness and is not available with any
other SAV.
SBT Electrical systems E70, E71
BMW AG - TIS
06.02.2013 01:03
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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