Alfa Romeo STELVIO 2022 Owner's Handbook Manual page 96

heard, indicating that the car is about to
move.
46) 47)
AST (Alfa™ Steering Torque) SYSTEM
48)
The AST function integrates the ESC
system with the electric power steering
to increase the safety level of the whole
car.
In critical situations (braking on surfaces
with different grip conditions), through
the AST function, the ESC system
controls the steering to implement an
additional torque contribution on the
steering wheel, to suggest the most
correct manoeuvre to the driver.
The coordinated action of the brakes
and steering increases the sensation of
safety and control of the car.
ATV (Alfa™ Active Torque Vectoring)
SYSTEM
(where provided)
The dynamic drive control is used to
optimise and balance the drive torque
between the wheels of the same axis.
The ATV system improves grip when
cornering by sending more drive torque
to the outside wheel.
Given that, in a turn, the external wheels
of the car travel more than the internal
ones and therefore turn faster, sending a
higher thrust to the external rear wheel
94
allows for the car to be more stable
and to not suffer a phenomenon called
"understeer". Understeer occurs when,
during a turn, a car tends to widen the set
trajectory, in this situation the lateral
acceleration the car is subjected to
becomes higher that the grip of the tyres,
which are unable to maintain the car in
the trajectory set by the driver through
the steering angle determined by turning
the steering wheel.
HDC (Hill Descent Control) SYSTEM
(where provided)
It is an integral part of the ESC system
and is aimed at keeping the car at a
constant speed during a descent,
operating autonomously on the brakes
in various ways guaranteeing the car
stability of the car to travel in complete
safety, particularly in low grip conditions
and on steep gradients.
The system has three different modes:
Off: the system is deactivated;
Enabled: the system is enabled and
ready to intervene when the activation
conditions are met;
Active: the system actively controls
the car speed.
Enabling the system
To enable the system, press the button
fig. 93.
93
The system is enabled if the car speed
is below 20 mph (30 km/h). The system
stays enabled until the car speed reaches
37 mph (60 km/h): the system is disabled
at faster speed.
System activation is indicated by the
white icon on the display fig. 94
turning on fixed.
94
System Activation
Once enabled, the HDC system will
activate automatically if the car is driven
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