DAF – Adaptive Cruise Control
For a safe and easy drive
Cruise control
Most modern commercial vehicles are
equipped with cruise control. Cruise control
maintains a set, constant vehicle speed under
varying road conditions and is of great benefit
for the driver when not on busy motorways.
Adaptive Cruise Control
The limitations of conventional cruise control
systems are overcome by Adaptive Cruise
Control (ACC).
If the vehicle catches up with a slower
preceding vehicle, ACC reduces engine throttle
and (if necessary) applies braking force to
maintain a safe distance as preset by the
driver, relieving the driver from frequent
manual intervention.
The ACC functionality includes Forward
Collision Warning. This alerts the driver they
are in danger of running into the back of
another vehicle.
What are the benefits of ACC?
Above all, Adaptive Cruise Control reduces the
strain on the driver. Because ACC maintains a
safe distance to the vehicle immediately
ahead, the driver is much more relaxed, with
reduced symptoms of fatigue.
In dense traffic, however, the driver must
continually adjust the vehicle speed to the
traffic flow. The benefit of conventional cruise
control systems diminishes as the traffic gets
DAF - Adaptive Cruise Control
The additional Forward Collision Warning
function increases the vehicle’s safety by
alerting the driver if a collision threatens.
Adaptive Cruise Control in DAF vehicles is
optimised to prevent adverse effects on fuel
DAF – Adaptive Cruise Control
For a safe and easy drive
How does ACC work?
A radar sensor behind the grille detects objects
ahead of the vehicle and checks their relative
speed and distance. Three radar beams together
with an integrated yaw rate sensor, enable the
system to differentiate between vehicles in the
same lane and those in other lanes.
ACC is connected to other vehicle management
systems for brake control, engine power,
AS Tronic gear shift and retarder control. This
allows direct intervention of ACC in those
The driver sets a desired cruise speed and
following distance mode to a vehicle ahead.
ACC adapts the vehicle’s speed to maintain the
preset following distance.
The following will be used for deceleration, in the
order as given:
• engine throttle
• engine brake
• automatic gear shift down
• secondary retarder
• service brakes
The ACC system has been limited to
decelerations up to 2.5 m/s2.
• ACC is intended for use on main roads and
• The field of view of the radar sensor is
limited. In some situations (for example a
motorcycle, or a vehicle driving off centre)
other traffic can be detected later than
expected or not be detected at all.
• ACC is a supporting system that will
contribute to a more relaxed and safer
driver. However, ACC is not an autopilot.
The driver will at all times remain fully
responsible for the vehicle.
When will ACC/ FCW react?
How will ACC/ FCW react?
ACC/ FCW will react on:
- moving objects ahead that are coming
closer, like preceding vehicles driving at a
lower speed.
- stationary objects that have been detected
moving before, like a slowly moving queue
that comes to a full stop.
Maintain a preset distance
If a preceding slower vehicle is detected, ACC
will maintain a safe distance by decelerating the
vehicle. If the lane ahead is clear again, the
vehicle will accelerate to the set cruise speed.
ACC/ FCW will not react on:
- objects that are moving away from the
vehicle, like overtaking vehicles.
- stationary objects, like a traffic jam that is
already at complete stand-still when first
- opposing traffic.
ACC distance alert
ACC will generate a visual
and audible distance alert if
intervention by the driver is
needed to maintain the
required distance.
Forward Collision Warning
If a situation is detected that
requires the maximum braking
effort in order to avoid a
collision, the driver will be
alerted with a red warning and
an acoustic signal.
Adaptive Cruise Control can be switched on and
off by the driver. Forward Collision Warning will
remain active even with ACC off.
DAF –- Adaptive