324 OPERATION
VOLVO ENHANCED STABILITY TECHNOLOGY
Some vehicles are equipped with Volvo Enhanced Stability Technology (VEST). VEST is
an advanced stability control system designed to provide both roll stability and under- and
over-steer correction in a wide variety of driving conditions. VEST continuously monitors
a variety of vehicle parameters and sensors (including steering angle sensor) to determine
whether the vehicle is reaching critical stability threshold. At that point, VEST is designed
to intervene by instantly de-throttling the engine and applying individual tractor and trailer
brakes as needed to regain control.
TRACTION CONTROL SYSTEM (TCS) (OPTIONAL)
CAUTION
DO NOT engage the differential locks
while wheels are spinning. Serious
damage to the differential will occur. See
“AXLES” page 378 for more information.
The Traction Control System (TCS) uses the same wheel sensors as the ABS to determine if
one set of drive wheels is spinning faster than the other wheel set. If the TCS determines
that a wheel is spinning (with vehicle speed below 40 km/h [25 mph]), it operates the brake
system to apply some brake force to stop the spinning wheel(s). This puts the drive power
over to the stationary wheel(s).
If vehicle speed is above 40 km/h (25 mph), a signal is sent to the engine ECU, which
reduces the engine speed to be consistent with vehicle speed. This action helps reduce the
amount of wheel spin and gives the operator greater vehicle control.
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