Driving
Tractor-trailer sway mitigation*
If the v
ehicle is pulling a tr
ailer, it will control
the following: tractor-trailers tend to sway.
When the swaying of the trailer is felt by the
vehicle and detected by the ESC, it will auto-
matically brake the towing vehicle within the
limits of the system and mitigate the sway.
Tractor-trailer sway mitigation is not available
in all countries
›››
page 294 .
Electronic engine torque management
(XDS)
When taking a curve, the driveshaft differen-
tial allows the outer wheel to turn at a higher
speed than the inner wheel. In this way, the
wheel that is turning faster (outer wheel) re-
ceives less drive torque than the inner wheel.
This may mean that in certain situations the
torque delivered to the inner wheel is too
high, causing the wheels to spin. On the oth-
er hand, the outer wheel is receiving a lower
drive torque than it could transmit. This can
cause a loss of grip on the drive axle, in this
case the front axle, which results in under-
steer or “lengthening” of the trajectory.
The XDS 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 requested
trajectory is much more precise.
XDS works in combination with the ESC and
is always active, even when TCS is switched
off, or when the ESC is in Sport mode or dis-
connected.
Multi-collision brake
The multi-collision brake consists of auto-
matic braking activated by the Airbag control
unit. It is activated when, in the event of an
accident, the Airbag control unit detects de-
celerations above the activation level, and
braking is managed by the ESC system.
In the event of an accident, the multi-colli-
sion brake can help the driver by braking to
avoid the risk of skidding during the accident
and causing other collisions.
The following actions control automatic
braking 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 there is an anomaly in the ESC system.
Electromechanical brake servo (eBKV)
With the ignition switched on, the electro-
mechanical brake servo supports the force
of the foot by increasing the pressure that
the driver exerts on the brake pedal. When
the brakes are applied by the driver assist
systems, such as those regulated by the ACC
(adaptive cruise control) or emergency brak-
ing, the brake pedal may move downwards.
After disconnecting the ignition, the assis-
tance of the brake servo is progressively re-
duced. Once stopped, immobilise the vehi-
cle to prevent it from moving. Please follow
the parking instructions
›››
page 270 .
If the electromechanical brake servo does
not work, the red symbol indicating failure
in the brake system appears in the instru-
ment panel. When braking with the faulty
electromechanical brake servo, vibration of
the brake pedal may occur.
If the electromechanical brake servo is not
working, the brake pedal must be pressed
harder, as the braking distance increases due
to the lack of assistance from the servo
brake.
Brake blending
1)
The brake energy recuperation can generate
a braking effect. This braking effect depends
1)
Valid for hybrid vehicles
268
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