Detroit Diesel DDEC VI Application And Installation page 318

FEATURES
Optimized Idle Start Up Sequence
The following occurs during every OI engine start:
1. Optimized Idle Active Light is ON. DDEC VI determines when the engine needs to start
to charge the battery, warm the engine, or heat/cool the vehicle interior.
2. The alarm (mounted in the engine compartment) will sound for five seconds.
3. After a short delay, the starter will engage and the engine will start. If the engine does
not reach a specified RPM within a few seconds, the system will be disarmed for the rest
of the ignition cycle. If the engine does not start, Optimized Idle will attempt a second
engine start in 45 seconds. The alarm will sound again prior to the second engine start.
4. Once the engine starts, it will ramp up to 1100 RPM (default). This value is customer
selectable with DDDL or DRS.
5. Vehicle accessories will be turned on thirty seconds after any thermostat based engine start
and will not be turned on for an engine mode start. If the engine is running in engine
mode, and the thermostat mode is requested, the vehicle accessories will be turned on
thirty seconds after the request.
If two or more conditions exist at the same time, DDEC will satisfy all parameters before shutting
down the engine. For example, if the engine started due to battery voltage, the engine will run
for a minimum of two hours. If the thermostat becomes unsatisfied and requests the engine to
run during this time, DDEC will control the HVAC fans through the Vehicle Power Shutdown
relay, turning them on and off as required by the thermostat. At the end of the two hours, if the
thermostat was not satisfied, the engine would continue to run.
Engine Mode
Engine Mode automatically stops and restarts the engine to maintain oil temperature and battery
voltage. The Optimized Idle Active Light is illuminated whenever Engine Mode is active.
Optimized Idle starts and stops the engine to keep the following parameters within limits while in
Engine Mode.
Battery Voltage - The engine will start when the battery voltage drops below 12.5 Volts for
12 Volt systems. This is the default. If an Ambient Air Temperature Sensor (AAT Sensor) is
installed, the customer can select an option to use a AAT Sensor vs. voltage table to determine the
start threshold for the battery. The thresholds are listed in Table 5-56.
Ambient Air Temperature
–40°C
–17.77°C
4.44°C
26.66°C
48.86°C
Table 5-56 Voltage Threshold Based on Ambient Air Temperature
5-106
Voltage Threshold
12.5 V
12.4 V
12.3 V
12.2 V
12.2 V
All information subject to change without notice. (Rev. 01/07)
7SA827 0701 Copyright © 2007 DETROIT DIESEL CORPORATION