freightliner M2 Plus 2023 Manual page 138

Optional Engine Systems
Engine Idle Limiting
Idle Shutdown Timer
This feature is an optional 1- to 100-minute idle
shutdown system with a timer on the driver display
screen. Its purpose is to conserve fuel by eliminating
excessive idling. Idle shutdown timing and
parameters are programmable. See the engine
manufacturer's operation manual for specific details
for your vehicle.
Optimized Idle®
Optimized Idle is an optional feature on vehicles
equipped with Detroit engines. Optimized Idle
reduces engine idle time by running the engine only
as required when the vehicle is parked.
Optimized Idle automatically shuts down and restarts
the engine as needed to:
•
Keep the engine oil temperature between
programmed limits;
•
maintain battery voltage;
•
keep the cab and sleeper areas at the
thermostat setting; and
•
in coordination with the Dual HVAC system (if
equipped), maintain the battery and assist in
HVAC.
The benefits of the system include reduced engine
idle time, fuel savings, reduction of exhaust
emissions and noise, increased starter and engine
life, and a reduced chance of dead batteries.
Optimized Idle operates in the following modes:
•
Cold startability mode and battery mode: Both
modes keep the battery charged and engine oil
temperature between programmed limits.
•
Interior comfort mode (for sleeper cabs without
a Dual HVAC system): Keeps the cab and
sleeper at a constant preset temperature, in
addition to all functions available in cold
startability and battery modes. Extended and
continuous run modes allow the engine to keep
running longer if necessary.
•
Interior comfort mode with a Dual HVAC
system: Keeps the cab and sleeper at a
constant preset temperature, in addition to all
functions available in cold startability and
battery modes.
10.1
In cold startability mode, Optimized Idle starts the
engine when engine oil temperature drops to a
programmable preset lower limit. The engine is shut
down when engine oil temperature reaches a
programmable upper limit, unless the requirements of
other active modes require the engine to keep
running.
In battery mode, the engine runs for 2 hours before
shutting down. On vehicles without a Dual HVAC
system, the engine runs an additional 2 hours in
extended mode if necessary, and continuously in
continuous mode. When in continuous mode, the
driver display indicates Optimized Idle status as
'continuous battery mode.' Continuous mode may
indicate a problem, such as a bad battery.
Interior comfort mode controls the temperature set
point, which is the desired temperature of the cab
and sleeper, and the comfort zone, which is the
allowed temperature deviation from the set point
before the engine starts.
Interior comfort mode with a Dual HVAC system
operates with the following parameters regarding the
set point and comfort zone:
•
If the bunk area temperature reaches more
than 10°F (5.5 °C) above the set point the
comfort zone is exceeded and the Dual HVAC
system immediately requests the engine to
start for comfort support cooling.
•
Bunk area temperatures 5 to 10°F (2.8 to
5.5°C) above the set point for over twenty
minutes causes the Dual HVAC system to
request the engine to start for comfort support
cooling.
•
If the bunk area temperature drops to more
than 10°F (5.5 °C) below the set point, the
comfort zone is exceeded and the Dual HVAC
system immediately requests the engine to
start for comfort support heating.
•
Temperatures 5 to 10°F (2.8 to 5.5 °C) below
the set point for over twenty minutes causes
the Dual HVAC system to request the engine
to start for comfort support for heating.
In extreme ambient conditions, comfort mode may
stay on continuously.
NOTE: If the mode settings are changed while
in one mode, the system may continue running
in another mode.
When Optimized Idle is on, it may turn off these
functions to reduce stress on the batteries: