04 Driver Support; Dstc - Stability And Traction Control System - Volvo V40 Owner's Manual

04 Driver support

DSTC – Stability and traction control system
General information on DSTC
The stability and traction control system,
DSTC (Dynamic Stability & Traction Control)
helps the driver to avoid skidding and
improves the car's traction.
The activation of the system during braking
may be noticed as a throbbing sound. The
car may accelerate slower than expected
when the accelerator pedal is depressed.
04
WARNING
The stability and traction control system is
a supplementary function - it cannot han-
dle all situations in all road conditions.
The driver always bears responsibility for
ensuring that the vehicle is driven safely
and that applicable road traffic rules and
regulations are followed.
Active Yaw Control
The function limits the driving and brake force
of the wheels individually in order to stabilise
the car.
Spin Control
The function reduces engine power if the
drive wheels slip against the underlying sur-
face in order to maintain stability and traction.
*
140
Option/accessory, for more information, see Introduction.
Traction control system
The function is active at low speed and trans-
fers power from the driving wheel that is spin-
ning to the one that is not.
Engine drag control - EDC
EDC (Engine Drag Control) prevents involun-
tary wheel locking, e.g. after shifting down or
engine braking when driving in low gears on
slippery road surfaces.
Involuntary wheel locking while driving can,
amongst other things, impair the driver's abil-
ity to steer the car.
Corner Traction Control – CTC
CTC compensates for understeer and allows
higher than normal acceleration in a bend
without wheelspin on the inner wheel, e.g. on
an arcing motorway entrance road to quickly
reach the prevailing traffic speed.
Driver Steering Recommendation – DSR
DSR (Driver Steering Recommendation) helps
the driver steer the car in the right direction
when there is reduced traction or when the
ABS system engages.
The primary role of the DSR function is to
help the driver steer in the right direction
when the car is skidding.
DSR engages by applying slight torque to the
steering wheel in the direction in which the
car should be steered to maintain/achieve
maximum possible traction and stabilise the
car.
Trailer Stability Assist* - TSA
The function serves to stabilise the car and
trailer combination if it begins to snake, see
page 309.
NOTE
The function is deactivated if the driver
selects Sport mode.
Operation
Selection of level - Sport mode
The DSTC system is always activated - it
cannot be deactivated.
However, the driver can select the Sport
mode, which allows for a more active driving
experience. In Sport mode the system
detects whether the accelerator pedal, steer-
ing wheel movements and cornering are more
active than in normal driving and then allows
controlled skidding with the rear section up to
a certain level before it intervenes and stabil-
ises the car.
If the driver stops a controlled skid by releas-
ing the accelerator pedal then the DSTC sys-
tem intervenes and stabilises the car.