Esp - Electronic Stability Program; Control Of Engine Torque - Volvo FM Handbook

ESP — Electronic Stability Program
ESP ESP (Electronic stability program) is a stabilising
system that reduces the risk of rolling over and
skidding.
If the system senses that the vehicle is about to roll
over, it first reduces the throttle. If this is not
sufficient, the system also uses the wheel brakes to
reduce the vehicle's speed. The system works best
when the trailer also has ABS or EBS .
If the system senses that there is a risk for skidding,
the throttle is reduced and the wheels are braked in a
manner that allows the vehicle to continue on the
correct course. If necessary, the auxiliary brakes are
also disconnected.
A symbol lights when the system is acting.

Control of engine torque

When the accelerator pedal is released on a slippery
road, the auxiliary brake can lock the driving wheels.
When this happens the auxiliary brake is disengaged
and the engine is accelerated until the driving wheels
rotate at the same speed as the front wheels. This does
not happen if the gearbox is in neutral position, ABS is
activated or the vehicle speed is lower than 10 km/h.
Driving 153
Symbol for ESP engagement.
Warning!
Drive the truck in the same way
as vehicles without ESP. ESP
reduces the risk of tipping and
skidding, but the vehicles can still
tip over if the centre of gravity is
very high, if the wheels hit a curb
at high speed, or through careless
driving. A truck can skid on
slippery surfaces even if it has
ESP.
Do not drive on heavily cambered
roads (e.g. test tracks) with
vehicles fitted with ESP. Driving
on heavily cambered roads can
cause the ESPsystem to engage
unnecessarily and dangerously.
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