Engine Brake And Cruise Control - Detroit Diesel DD15 EuroIV Operator's Manual

CAUTION: LOSS OF VEHICLE CONTROL
To avoid injury from the loss of vehicle control, do not use cruise
control under these conditions:
• When it is not possible to keep the vehicle at a constant speed
(on winding roads, in heavy traffic, in traffic that varies in
speed, etc.).
• On slippery roads (wet pavement, ice-or snow-covered roads,
loose gravel, etc.).
Cruise Control will maintain the set speed under normal road and load conditions.
It cannot limit vehicle speeds on down grades if available engine braking effort is
exceeded, nor can it maintain speed on upgrades if power requirements exceed
engine power capability.
Cruise Control will disengage below 1000 rpm or 20 mph (32 kph) road speed.
When using Cruise Control, if you want to pull the engine below 1000 rpm,
remember to hold the accelerator pedal to the floor to keep the engine pulling at
wide-open throttle. The engine will pull down to about 1050 rpm.
Remember:The electronic data programmed into the DDEC system will not allow
you to hurt or over fuel the engine at low or lug engine speeds. There is enough oil
pressure to withstand hard pulls at low engine speeds.
Cruise Control may also be programmed to permit fast idle using the Cruise
Control switches.
With the engine at normal idle, transmission in neutral and service brakes on, press
the SPD CNTL Switch, and use the RSM/ACC Switch. The engine rpm should
increase to a pre-defined speed. The engine rpm can be raised or lowered from this
point using the SET/CST and RSM/ACC switches.

Engine Brake and Cruise Control

Your engine is equipped with both Cruise Control and an engine brake; the engine
brake can operate automatically while you are in Cruise Control. If the Cruise
Control/Engine Brake function is turned ON in the DDEC 10 system programming,
the engine brake will come on low when your set road speed increases a few mph
(kph) above your cruise set speed. If your speed continues to increase, the DDEC
10 system will increase the engine brake's braking power progressively. When the
vehicle returns to the set cruise speed the engine brake will turn off until you need
them.
For safety reasons, don't use Cruise Control when it is not possible to keep the
vehicle at constant speed due to:
• Winding roads
• Heavy traffic
• Slippery pavement
• Descending grades calling for engine brake assistance
All information subject to change without notice.
DDC-SVC-MAN-0175 Copyright © 2014 DETROIT DIESEL CORPORATION
DD Platform EuroIV Operators Manual
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