Cruise Descent Control And Deceleration Modes - freightliner M2 Plus 2023 Manual

1.1 Depress the accelerator pedal until the
speedometer reaches the desired speed.
1.2
Press the cruise decelerate/SET button to
set the desired speed.
NOTE: The set speed memory is lost whenever
the ignition is turned off.
2.
To disengage the cruise control, do one of the
following:
•
Press the CNCL button in the center of the
right-hand steering-wheel-mounted switch
pod. A single press disengages the cruise
control, but retains the set speed.
On vehicle's equipped with a Detroit Diesel
engine, press and hold the CNCL button to
clear the set speed.
•
Depress the brake pedal.
•
If equipped with a manual transmission,
press the clutch pedal.
3. To resume a preselected cruise speed, press the
cruise accelerate/RES button. Cruise control
returns to the last set speed.
NOTE: If vehicle speed drops below the
minimum cruise control speed, cruise control
disengages. To resume to the preselected cruise
speed, increase the vehicle speed to above the
minimum cruise control speed and press the
cruise accelerate/RES button.
4. To increase cruise speed, press the cruise
accelerate/RES button until the desired set
speed is displayed.
5. To decrease cruise speed, press the cruise
decelerate/SET button until the desired set
speed is displayed.
The cruise speed hysteresis (maximum speed above
and below the set speed) can be set in the ICU
settings menu. The leading vehicle following distance
can be set using the quick access button.
Cruise Descent Control and
Deceleration Modes
NOTE: As a feature of cruise control, descent
control mode works with all transmission
options; however, cruise control can only
request a specific gear if the vehicle is equipped
with a DT12. Descent control mode with
Driver Assistance Features
transmissions other than D12 is therefore
limited.
On vehicles equipped with a Detroit DT12 automated
transmission, the functions of the engine brake
controls change, depending on which specialty
braking mode is being utilized. Two distinct modes
can be activated:
•
Descent control mode: engine braking
attempts to maintain a set speed; accelerator
pedal is not automatically applied. Setting the
cruise control speed with the engine brake on
activates cruise descent control mode. Moving
the transmission shift lever to the top position
resumes the set cruise speed.
•
Deceleration mode: engine braking activates
to reduce vehicle speed (with no lower limit) at
a constant rate. Moving the transmission shift
lever down to engage the engine brake after
the cruise control has been set activates
deceleration mode.
Descent Control Mode
NOTE: Before engaging descent control,
determine an appropriate speed for the vehicle's
load and grade of the road.
Descent control mode attempts to keep the vehicle
speed at the set speed using all available engine
brake stages when descending a grade.
To activate descent control mode:
1.
Exit cruise control.
2. Remove your foot from the accelerator pedal.
3. Set the engine brake to any of the three 'on'
positions as shown in
4. Use the set or resume buttons to set the vehicle
speed.
The descent control mode active telltale illuminates
on the driver display when descent control mode is
active. See Fig. 7.4.
In descent control mode, all three levels of engine
braking are employed to keep the speed below the
set speed regardless of the level selected by the
right-hand stalk switch.
In the case of very steep road grades, the engine
brake may not be able to maintain the vehicle speed.
The driver may apply the service brakes without
dropping out of descent mode to slow the vehicle. If
the vehicle is slowed below the set speed, this lower
Fig. 7.3.
7.2