Volvo S 90 2017, Owner'S Manual

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DRIVER SUPPORT
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253
Roll stability control (RSC)
Volvo's Roll Stability Control (RSC) is a stability
system designed to help minimize the risk of a
rollover in emergency maneuvers or if a skid
should occur.
RSC registers the amount of change in the lat-
eral angle at which the vehicle is leaning. Using
this information, RSC calculates the likelihood of
a rollover. If there is an imminent risk of a rollover,
the stability system is activated, power to the
engine is cut and the brakes are applied to one
or more of the wheels until the vehicle regains
stability.
WARNING
The vehicle’s stability systems, including RSC,
do not replace the driver’s responsibility for
operating the vehicle in a safe manner. Speed
and driving style should always be adapted to
the current road, traffic and weather condi-
tions. Posted speed limits should always be
respected.
Related information
•
Electronic Stability Control (ESC) (p. 253)
•
General safety information (p. 58)
Electronic Stability Control (ESC)
Electronic Stability Control (ESC) helps reduce
wheel spin, counteract skidding and to generally
help improve directional stability.
A pulsating sound will be audi-
ble when the system is actively
operating and is normal. Accel-
eration may also be slightly
slower than normal.
WARNING
•
The stability system (ESC) is intended to
help improve driving safety but cannot
deal with all situations, or traffic, road and
weather conditions. Speed and driving
style should always be adapted to the
current driving situation.
•
ESC supplements, but can never replace,
the driver's judgment and responsibility
when operating the vehicle. The driver is
always responsible for operating the vehi-
cle in a safe manner in accordance with
applicable traffic regulations.
ESC consists of the following functions:
•
Traction control
•
Spin control
•
Active Yaw Control
•
Engine Drag Control
•
Trailer Stability Assist
Traction control
This function is designed to help reduce wheel
spin by transferring power from a drive wheel that
begins to lose traction to the wheel on the oppo-
site side of the vehicle (on the same axle).
Spin control
This function is designed to help prevent the
drive wheels from spinning while the vehicle is
accelerating.
Active Yaw Control
At low speeds, this function helps maintain direc-
tional stability by braking one or more of the
wheels if the vehicle shows a tendency to skid or
slide laterally.
Engine Drag Control EDC
EDC helps keep the engine running if the wheels
show a tendency to lock, e.g., when shifting down
in the manual shifting mode or while using the
engine's braking function on a slippery surface. If
the wheels were to lock, the vehicle would
become more difficult to steer.