X Series E83 X3 3.0d (M57TU) OFFRD
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Transmission oil temperature (calculated in the VTG control unit)
The VTG control unit supplies the following information to the DSC control unit:
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The locking torque currently set
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All calculated data
The locking torque is limited whenever needed in order to reduce the frictional work.
> E53, E83 [more ...]
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DSC: Dynamic Stability Control
With xDrive, DSC includes the following functions:
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All-wheel control
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Automatic Differential Brake (ADB-X)
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Hill Descent Control (HDC)
All-wheel control
Dynamic Stability Control (DSC) specifies the nominal value for xDrive all-wheel control. The nominal value
depends on the vehicle's tendency to oversteer or understeer and wheel slip. The nominal value is
transmitted to the VTG control unit.
Automatic differential brake
The automatic differential brake (ADB-X) simulates the function of conventional limited-slip differentials by
selectively applying brakes on individual wheels (known from the E53 and the E46 All-wheel drive).
Whenever a wheel displays a tendency to spin the ADB-X automatically brakes it down to a preset slip. This
effect of this is to increase the drive torque on those wheels that have a higher friction coefficient on a
lining.
Hill Descent Control
Hill Decent Control (HDC) is a cruise control on four-wheel drive cars for driving downhill (known from the
E53 and the E46 All-wheel drive).
HDC can be activated and deactivated with a separate button.
When the HDC button is pressed, HDC automatically reduces road speed. The brakes are applied on all
four wheels to reduce road speed to just above walking pace. HDC holds this speed constant (all DSC
functions remain active).
The car's road speed can be freely varied within fixed values by pressing down on the accelerator pedal,
brake pedal or the buttons for the cruise-control system.
The following control units and switches are incorporated in xDrive functions:
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DME or DDE: Digital engine electronics or digital diesel electronics
The DME or DDE modifies the engine response as required by the DSC control unit (such as power reduction to
prevent the driven wheels from spinning).
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Instrument cluster display
System states are displayed as follows:
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DSC/xDrive telltale and warning lights light up:
DSC/xDrive not activated
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DSC/xDrive telltale and warning lights light up and acoustic signal:
DSC defective, ABS not affected, VTG control unit OK
or
SBT xDrive E53, E70, E83
BMW AG - TIS
16.02.2013 00:48
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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