Trailer Stabiliser - Tsa - Volvo V70 Owner's Manual

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Trailer stabiliser - TSA

The trailer stability assist (TSA - Trailer
Stability Assist) function is designed to stabi-
lise the car and trailer combination if it begins
to snake.
The trailer stability assist is included in the
stability and traction control system (p. 179)
(DSTC - Dynamic Stability and Traction
Control).
Function
The snaking phenomenon can occur with any
car/trailer combination. Snaking normally
occurs at high speeds. But, there is a risk of it
occurring at lower speeds (70-90 km/h) if the
trailer is overloaded or the load is improperly
distributed, e.g. too far back.
In order for snaking to occur, there must be a
triggering factor, e.g.:
•
Car with trailer subjected to a sudden and
powerful side wind.
•
Car with trailer drives on an uneven road
surface or in a pothole.
•
Sweeping steering wheel movements.
Operation
If snaking has started, it could be difficult or
even impossible to suppress. This makes the
car/trailer combination difficult to control and
there is a risk that you could, for example,
Included in the installation of Volvo genuine towbar.
18
end up in the wrong lane or leave the car-
riageway.
The trailer stability assist continually monitors
the car's movements, particularly lateral
movements. If snaking is detected, the front
wheels are individually braked. This serves to
stabilise the car/trailer combination. This is
often enough to help the driver regain control
of the car.
If snaking is not eliminated the first time the
trailer stability assist comes into action, the
car/trailer combination is braked with all
wheels and engine power is reduced. Once
snaking has been gradually suppressed and
the car/trailer combination is stable once
again, the system stops regulating and the
driver once again has full control of the car.
For more information, see Stability and trac-
tion control system (DSTC) - operation (p.
180)
Miscellaneous
The trailer stability assist can engage within
the speed interval 60-160 km/h.
NOTE
TSA function is switched off if the driver
Sport
selects mode, see Stability and
traction control system (DSTC) (p. 179).
08 Starting and driving
The trailer stability assist may fail to engage if
the driver uses sudden steering wheel move-
ments to try to rectify the snaking because in
such a situation the system cannot determine
whether it is the trailer or the driver that is
causing the snaking.
When the trailer stability assist is
working, the combined instrument
panel's DSTC symbol flashes.
Related information
•
Stability and traction control system
(DSTC) - symbols and messages (p. 181)
08
301