Volvo FH - Page 253

I-Roll
I-Roll
(freewheel) can be activated if the stalk for the
auxiliary brake, to the right of the steering wheel, is in
the A position and
E+
is shown in the display. When
I-Roll
is activated the split gear is put into neutral.
I-Roll
is activated in different ways depending on the
cruise control being active or not. When the
I-Roll
is
activated, N is shown as the gear in the info display
and the engine goes to idle.
If the cruise control is active:
•
I-Roll
is engaged on downhill slopes when the
speed exceeds the set driving speed (for example 80
km/h). The set permitted excess speed must be 5
km/h or more. (See the “Driver's Manual”, section
on auxiliary brakes for more information as to how
the auxiliary brake functions and how the excess
speed can be set.)
•
I-Roll
is disengaged when the speed exceeds the
selected overspeed or below, or just below, the set
driving speed (for example 80 km/h).
•
The
I-Roll
function also includes the
Smart Cruise Control
that inactivates the auxiliary
brakes at the end of downhill slopes to further save
fuel.
If the cruise control is not active:
•
I-Roll
is engaged when the accelerator pedal is
released and the road is flat or slopes gradually up-
or downhill.
•
The
I-Roll
is disengaged when the brake pedal is
depressed, the accelerator pedal is depressed, the
stalk for the auxiliary brake is set in position 0, 1, 2,
3 or B or if the gear shift lever is set to position M.
Inactivate
I-Roll
by pressing the minus button on the
gear shift lever or by moving the auxiliary brake stalk
to the 0 position.
242
I-Shift