PREVOST H3-45 VIP Owner's Manual page 107

TURNING OFF THE ACB SYSTEM
You can turn off the ACB system, simply by applying service brakes, setting the CRUISE rocker switch to the
OFF position or pressing the cruise control CANCEL button on the steering wheel.
NOTE
Whenever the service brakes are applied by intervention of the ACB or by the driver, normal cruise will
automatically be canceled. The driver must resume or set the cruise mode in order for the vehicle to throttle up.
TURNING THE ACB SYSTEM ON
Activation of the Adaptive Cruise with Braking is similar to the regular cruise control activation. Press the
CRUISE rocker switch to the ON position, accelerate the vehicle to the desired cruising speed and then, press
the SET button. ACB is now engaged with the set following distance and driver warning features. Whenever the
cruise control is engaged, the ACB is also engaged. You cannot engage the cruise control alone, without
engaging the ACB features.
MAINTAINING A SET FOLLOWING DISTANCE
Using a radar sensor mounted to the front bumper, the ACB system measures the distance between the coach
and the forward vehicle and intervenes to help maintain a safe set following distance behind the vehicle. This
feature engages automatically once the driver turns on and sets cruise speed.
Following distance refers to the time gap, measured in seconds, between the coach and the vehicle ahead. The
actual physical distance between the coach and the vehicle ahead will vary based on your set cruise speed;
although the set time gap remains the same for all set cruise speeds. Prevost's default set time gap is 1.7
seconds.
With cruise control engaged and a cruise speed set, you are maintaining a set following distance behind the
vehicle in front of you (The system DOES NOT respond to side-to-side moving traffic or oncoming traffic.).
If the vehicle in front of the coach slows down below your cruise control set speed, the system will
progressively intervene as follows, in this order:
1. Reduce the engine throttle;
2. Apply the engine brake;
3. Apply about 30% of the service brakes available braking power in an attempt to maintain the set
following distance.
The driver must apply additional braking power when required, to avoid collision or to maintain a safe distance
from the vehicle ahead.
NOTE
If the ACB is actively decelerating or braking the coach in an attempt to maintain the set following distance at
the moment when the driver cancels the ACB system, the ACB system will continue deceleration or braking
intervention until a safe following distance is established, then will cancel.
Even though the cruise control doesn't operate at speeds below 30 mph (50 km/h), the ACB system will
continue deceleration or braking intervention in an attempt to maintain the set following distance if the coach
speed reduces to less than 30 mph (50 km/h).
If the vehicle ahead slows below your cruise control's set speed, but then accelerates away, and the ACB
system did not need to use the service brakes as it managed the intervention, the coach will automatically
accelerate back to the original cruise control set speed, and again maintain a set following distance behind the
forward vehicle.
PA-1619 Owner's Manual H3-45 VIP
Controls and Instruments 4-61