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Driving
Electronic torque management
(XDS)*
When taking a curve, the driveshaft differen-
tial mechanism allows the out
er wheel to turn
at a higher speed than the inner wheel. In this
way, the wheel that is turning faster (outer
wheel) receives less drive torque than the in-
ner wheel. This may mean that in certain sit-
uations the torque delivered to the inner
wheel is too high, causing the wheels to spin.
On the other hand, the outer wheel is receiv-
ing a lower drive torque than it could transmit.
This causes an overall loss of lateral grip on
the front axle, resulting in understeer or
“lengthening” of the trajectory.
The XDS system can detect and correct this
effect via the sensors and signals of the ESC.
Via the ESC, the XDS will brake the inside
wheel and counter the excess driving torque
of that wheel. This means that the driver's de-
sired trajectory is much more precise.
The XDS system works in combination with
the ESC and is always active, even when ASR
traction control is disconnected or the ESC is
in Sport mode.
Multi-collision Brake*
In an accident, the multi-collision brake can
help the driv
er by br
aking t
o avoid the risk of
skidding during the accident, which could
lead to further collisions.
The multi-collision brake works for front, side
or rear accidents, when the airbag control
unit records its activation level and the acci-
dent takes place at a speed of over 10 km/h
(6 mph). The ESC automatically brakes the
vehicle, as long as the accident has not dam-
aged the ESC, the brake hydraulics or the on-
board network
The following actions control automatic brak-
ing during the accident:
●
When the driver presses the accelerator,
the automatic braking does not take place.
●
When the braking pressure through press-
ing the brake pedal is greater than the sys-
tem’s braking pressure the vehicle will brake
automatically.
●
Multi-collision braking will not be available
if ESC is malfunctioning.
Brake servo
The brake servo increases the pressure you
apply t
o the br
ak
e pedal. It works only when
the engine is running.
If the brake servo is not functioning, e.g. due
to a malfunction, or if the vehicle is being tow-
ed, you will have to press the brake pedal
considerably harder to make up for the lack
of servo assistance.
WARNING
The braking distance can also be affected
by external f
actors.
●
Never let the vehicle coast with the en-
gine switched off. Failure to follow this in-
struction could result in an accident. The
braking distance is increased considerably
when the brake servo is not active.
●
If the brake servo is not working, for ex-
ample when the vehicle is being towed, you
will have to press the brake pedal consid-
erably harder than normal.
Hill driving assistant*
Fig. 220 Related video
This function is only included in vehicles with
ESC.
The hill driving assist
ant helps the driv
er t
o
move off and upward on a hill when the vehi-
cle is stationary.
234
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