Cruise Control - Detroit Diesel DDEC VI Application And Installation

5.3

CRUISE CONTROL

Cruise Control maintains a targeted speed (MPH) by increasing or decreasing fueling. The
targeted speed can be selected and adjusted with dash-mounted switches. Up to five digital
inputs are required (four for automatic transmission) for Cruise Control operation. A Vehicle
Speed Sensor (VSS) or an output shaft speed message over the J1939 data link is required for
Cruise Control.
5.3.1 OPERATION
Cruise Control operates to control vehicle speed. A Vehicle Speed Sensor (VSS) must be installed
or output shaft speed is received over J1939. Engine speed and power are varied under Cruise
Control to maintain the set vehicle speed. The vehicle speed must be above "Min Cruise Set
Speed" and below "Max Cruise Set Speed." It is recommended that "Max Cruise Set Speed" be
set to the default to allow proper operation of other features such as Fuel Economy Incentive and
PasSmart. The "Max Road Speed" should be used to limit vehicle throttle speed.
Cruise Control can be overridden at any time with the throttle pedal if the vehicle is operating at
less than the programmed Max Road Speed.
Clutch pedal and service brake pedal, if configured, are monitored to abort fueling the engine in
Cruise Control Active Mode if there is driver action.
NOTE:
DDEC must see a change of state of the Cruise Master Switch, Clutch Switch (if
configured) and Service Brake Switch before Cruise Control can become active upon
every ignition cycle.
There are three Cruise Control operation modes as listed in Table 5-5.
Cruise
Control
Mode
Cruise Control ON/OFF switch is in OFF position or Cruise
Off Control ON/OFF is switched to ON position although Cruise
Control is not initiated.
Cruise Control ON/OFF switch in ON position and Cruise
Control is initiated and set speed has already been set.
Active
The set speed can be increased or decreased by using the
Resume/Accel and Set/Coast switches.
Cruise Control ON/OFF switch in On position and Cruise
Control formerly active but not allowed anymore or no set
Standby
speed has been set after switching Cruise Control On and
Cruise Control is initiated.
Table 5-5 Three Cruise Control Operation Modes
All information subject to change without notice. (Rev. 01/07)
7SA827 0701 Copyright © 2007 DETROIT DIESEL CORPORATION
DDEC VI ELECTRONIC CONTROLS APPLICATION AND INSTALLATION
Conditions
Engine Fuel
Controlled
Set Speed
By Cruise
Control
0 MPH No
Set Speed (+/-) Yes
Last Set speed
No
on Hold in
Memory
5-9