X Series E70 X5 3.0Sd (M57T2) OFFRD
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Automatic transmission
The GA6HPTU automatic transmission has been revised in the following respects:
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Torque moment converter with torsion damper
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Adjusted electronic transmission control (EGS)
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More responsive hydraulics thanks to new pressure regulator
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Electric switching via gear selector switch (GMWS)
The EGS control unit is located in the automatic transmission. The electronic immobiliser (EWS) is integrated in
the EGS control unit. This increases the degree of theft protection.
The gear selector switch (GWS) is a separate control unit.
The gear selector switch (GWS) acts to select a drive level of the automatic transmission with Steptronic mode
and sport program. The transmission selector switch is located at the front of the centre console of the vehicle
and is a separate control unit. With the gear selector switch, instead of being actuated mechanically, the
transmission is now actuated electronically.
The gear selector switch (GWS) consists of the control electronics and the selector lever.
The sensors for recording the selector lever position and for inhibiting inadvertent gearshifts are integrated in the
control electronics.
The E71 is available with rocker switches.
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xDrive
xDrive is an all-wheel drive system that links Dynamic Stability Control (DSC) system to an electronically
controlled multi-plate clutch in the transfer case.
The electronically controlled multi-plate clutch smoothly distributes the drive torque as required to the front axle.
The rear axle is always powered.
All of the input torque is applied to the rear axle when the multi-plate clutch is separated.
xDrive constantly communicates with the DSC. The drive-dynamic input information is computed in the DSC
control unit.
Important items of information are:
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Gas pedal position
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Engine torque
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Drive-dynamic state
The DSC calculates the necessary locking torque. The locking torque is communicated to xDrive. This allows
xDrive to determine whether the vehicle is able to follow the driver's commands.
If the wheels exhibit a tendency to spin or there is a risk of over- or understeering, xDrive cuts in with a corrective
effect.
xDrive adjusts the drive torque between the two axles in response to requirements.
Only if xDrive cannot maintain the vehicle's course on its own will DSC also intervene. Engine output is reduced
and individual wheels are specifically braked.
The drive torque is delivered to the axle that has better traction when road conditions change, due for example
to snow, ice or a loose road surface.
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Transverse torque distribution (only E71)
The rear axle transverse torque distribution is fitted as standard and is offered by Marketing under the name
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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