SERIES 50 OPERATOR'S GUIDE
DDEC IV ENGINE DRIVING TIPS
Driving with an electronically
controlled engine feels different from
driving with a mechancially governed
engine.
Accelerating the Vehicle
Engine response versus pedal
movement may feel different from the
mechanical-governed engine you were
driving. The electronic foot pedal
assembly (EFPA) was designed to
communicate “percentage” foot pedal
travel to the engine's electronic control
module (ECM). The engine will
respond accordingly to the driver's
demand.
Another throttle or governor
characteristic you may need time to
get used to is the DDEC limiting
speed governor. This allows the driver
to command total engine response
between idle and rated speed, such
as accelerating at half throttle —
an advantage when driving under
slippery conditions.
If you require wide-open throttle
engine response, either accelerating
or just plain pulling hard, the throttle
(EFPA) will have to be held to the
floor. To obtain 100% fueling at any
speed, the foot pedal will have to
be maintained at the fully depressed
position.
Cruise Control
For added driver convenience and
comfort, DDEC IV also features a
cruise control option that works just
like the system in your car. It can
be operated in any gear above 1000
rpm or road speed faster than 20
mph (32 kph), up to the rated engine
speed. And it can be programmed to
hold your road speed at or below the
maximum vehicle speed. The switch
to energize cruise control is usually
mounted on the instrument panel.
See Figure 9.
Figure 9
Typical Cruise Control
Switches
All information subject to change without notice.
(Rev. 01/ 04)
37
6SE550 0401
Copyright © 2004 DETROIT DIESEL CORPORATION