PREVOST H 2018 Series Operator'S Manual Download

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CONTROLS AND INSTRUMENTS 4-11

PA1628 H3-41, H3-45 Operator’s Manual

not ACB is turned on. In addition to the audible
and visual warnings, when the ACB is turned on
and a cruise speed is set, the driver benefits
from active interventions like engine throttle
reduction, retarder or engine brake application
and service brakes application

to help maintain

a set following distance

WARNING

Adaptive Cruise Braking must be used only in
the same conditions that are normally
recommended for ordinary cruise control.
Refer to “Regular Cruise Control” paragraph.

TURNING THE ACB SYSTEM ON

Activation of the adaptive cruise 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 warnings features.
Whenever the cruise control is engaged, the ACB
is also engaged. You cannot engage the cruise
control alone, without engaging the ACB
features.

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 cancelled.
The driver must resume or set the cruise
mode in order for the vehicle to throttle up.

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
between the coach and the forward vehicle:

•

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:

•

Reduce the engine throttle;

•

Apply the engine brake or transmission
retarder;

•

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.