Technical data

70
Additional shift stage
10
8
6
4
2
0
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Comparison of the EDL minimum control thresholds (transverse lock)
during straight-ahead driving
Speed difference of the wheels of one axle in km/h
Speed in km/h
Audi A6
allroad quattro with additional shift stage
The following applies:
If a high engine torque is available, the EDL
control intervenes at lower differential wheel
speeds, compared with a low engine torque.
Electronic differential lock EDL
One of the main aims of the adaptation of
electronic differential locks via brake
intervention (EDL) is to create a locking torque
with minimum wheel slip.
The wheel speeds were considered as the
primary control parameters when introducing
the EDL system.
In order to protect the engine from stalling
during braking, relatively high differential
wheel speeds were necessary.
EDL control takes place in this case according
to pre-set differential wheel speeds,
depending upon the vehicle speed.
Since the introduction of ESP, EDL control is
performed by creating a so-called torque
balance.
The braking effect is determined by taking
account of the available engine torque and
the drive torque which can be transmitted to
the individual wheels.
Explanation:
The minimum control threshold is the
differential wheel speed which initiates
EDL control.
It is dependant upon the torque
balance and the vehicle speed.
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