freightliner 108SD, Руководство пользователя, Страница: 115 / 192

•
Do not use the throttle to stop roll back on an
incline after Hill Start Aid disengages; use the
service brakes, and then relaunch.
•
Do not continually start and stop, especially
when loaded; use a lower gear or Creep Mode.
Creep Mode
The Creep Mode function allows the vehicle to main-
tain a constant speed at engine idle without the
driver holding the throttle pedal position. This mode
is useful for very low-speed maneuvering and appli-
cations where steady vehicle speed is required. The
vehicle speed is determined by the selected gear
ratio operating at governed low engine idle speed.
Any available gear may be selected, though the
transmission will downshift or exit Creep Mode to
prevent stalling if the engine lugs due to load condi-
tions.
By default, Creep Mode can be activated while in
Manual Mode or Low. Eaton’s ServiceRanger diag-
nostic software can be used to enable Creep Mode
in Automatic Mode and/or Reverse.
Engaging Creep Mode
To engage Creep Mode:
1.
Select Low or Manual Mode and the desired
gear (while stopped or moving).
2. Apply the throttle pedal to accelerate the vehicle
until the clutch is closed (engaged).
3. Release the throttle pedal. The vehicle will con-
tinue moving at governed low engine idle speed.
Exiting Creep Mode
To exit Creep Mode, apply the throttle pedal to accel-
erate temporarily, or select a higher gear in Manual
Mode. (Creep Mode can be resumed in the selected
gear by releasing the throttle pedal.)
NOTE: The transmission will exit Creep Mode if
the engine lugs 150 rpm below the governed
low engine idle speed. In this case, a lower gear
should be selected if available.
Hill Start Aid
UltraShift PLUS transmissions are equipped with a
Hill Start Aid (HSA) feature to prevent the vehicle
from rolling while on grades steeper than 3% and
allow for a controlled launch. A grade sensor is used
to determine when to engage the feature.
HSA is "on" by default. It can be turned off by press-
ing and releasing the override switch on the dash.
HSA will turn back on after the first successful
launch.
When the vehicle is stopped on a grade greater than
3% and in a forward mode or reverse, depress the
service brakes then release them. The vehicle will
begin to move after 3 seconds, and the clutch will
perform partial engagements to slow the vehicle mo-
tion. Either step on the brake or apply the throttle to
continue negotiating the grade.
Engine Overspeed Protection
The system will upshift if necessary to prevent en-
gine overspeed in Drive, Manual, and Low.
Shuttle Shifting
Shuttle shifting from reverse to any forward mode is
only allowed if the vehicle speed is approximately
zero.
Auto Start Gear Selection and
Override
The UltraShift PLUS system uses various inputs to
automatically select the best start gear in Drive and
Manual. This selection can be changed using the
SmartShift control; however, if the selection re-
quested could cause damage or engine lugging, the
request will be denied and a tone will sound.
Skip Shifting
When appropriate, the UltraShift PLUS system may
skip shift in Drive. When prevailing conditions like
load and grade allow, skip shifts can be performed in
Manual mode using the SmartShift control.
Auto Neutral
The UltraShift PLUS system will automatically shift to
neutral if the vehicle is left in Drive and the parking
brake is set. "AN" will show on the gear display. To
re-engage the transmission, select Neutral and then
either Drive or Reverse on the shift control (it will re-
engage regardless of whether the parking brake is
released).
Automated and Automatic Transmissions
14.9