Features and Parameters
The ISB Cruise Control Feature is easily accessed and setup using Cummins PowerSpec. The feature interacts with various other features such as Engine Brake and Road Speed Governor. It should therefore not be programmed in isolation.
Cruise Control Enable
Choose this feature if the convenience and benefits of Cruise Control are desired.
Cruise Control Maximum Vehicle Speed
Specify the maximum vehicle speed when the Cruise Control feature is active. This parameter is used to limit vehicle speed while the Cruise Control feature is on.
Setting the Cruise Control Maximum Vehicle Speed slightly higher than the Accelerator Maximum Vehicle Speed (Road Speed Governor Maximum Speed), provides an incentive for drivers to operate in Cruise Control. This can have a positive effect on fuel consumption.
Setting it 2-4 MPH below the Accelerator Maximum Vehicle Speed will give the operator a small cushion of additional available speed that comes in handy when the accelerator pedal is used for passing situations.
The Cruise Control Maximum Vehicle Speed range is between 30 and 102 mph.
Cruise Control Auto Resume
Choose this option to allow Cruise Control to automatically resume its set speed after the operator makes a clutched gear change. This is a convenience feature and should be setup with the operator's preference in mind.
Cruise Control Save Set Speed
Choose this feature to save the most recent selected vehicle speed each time the engine is keyed off. This permits the driver to resume Cruise Control feature operation, at the vehicle speed selected prior to engine shutdown.
Cruise Control Lower Droop
During normal operation, as a vehicle negotiates a down-hill grade, the fueling required by the engine to maintain the set vehicle speed will progressively decrease. By slowing the reduction in fueling and allowing the vehicle speed to exceed the cruise control set speed limit by a small amount, the positive effects of momentum can be utilized in anticipation of the next up-hill grade. Cruise Control Lower Droop refers to the increase in speed above the set vehicle speed that the vehicle may travel in down-hill circumstances. The available Cruise Control Lower Droop range is between 0 - 3 MPH. Setting Cruise Control Lower Droop to 3 MPH will allow the vehicle to exceed the set vehicle speed by 3 MPH before limiting fueling and provide the maximum benefit that may be gained from vehicle momentum. Setting Cruise Control Lower Droop to 0 MPH will minimize the effects of momentum but will provide the best speed control during these circumstances.
Cruise Control Upper Droop
During normal operation, as the vehicle climbs an uphill grade, the Electronic Control Module will provide progressively increasing fueling to the engine in order to maintain the set vehicle speed. Continued up-hill climbing could eventually result in the maximum fueling rate being attained with little to no positive impact on vehicle speed. Cruise Control Upper Droop can minimize fuel consumed in these circumstances by automatically reducing the set vehicle speed by between 0 - 3 MPH. The time the engine spends at maximum fueling is thus reduced and fuel economy positively influenced. Setting the Upper Droop to 3 MPH will provide the best fuel economy benefit, while setting it to 0 MPH will provide maximum performance in these circumstances with no positive effect on fuel economy.
Engine Brake Cruise Control Activation
If the vehicle exceeds the Cruise Control Speed Deltas for Maximum and Minimum Engine Brake parameters and the Engine Brake switch is on, the Engine Brake will automatically be activated to slow the vehicle when this feature is enabled.
Cruise Control Speed Delta for Engine Brake Activation
Specify the increase in vehicle speed at which the engine brake will automatically activate. The parameter is defined as the speed over Cruise Control Maximum Vehicle Speed that the vehicle will attain before the Engine Brake is activated. As vehicle speed decreases, the engine brake disengages and normal cruise control operation resumes. The available range is from 1 to 10 MPH.
Adaptive Cruise Control
The Adaptive Cruise Control feature allows an Adaptive Cruise Control system (such as the Eaton VORAD SmartCruiseTM system to override the normal vehicle cruise control set speed when the following distance behind another vehicle is reduced below the set following distance.
The Adaptive Cruise Control system sends commands to the ECM via J1939 datalink to limit engine speed and maintain a set following distance behind a vehicle traveling slower than the current cruise control set speed. The Adaptive Cruise Control system will maintain this distance as long as the vehicle in front remains there. When the vehicle in front pulls away or is no longer in the path, the vehicle equipped with Adaptive Cruise Control will slowly ramp back up to the original Cruise Control set speed.
The Adaptive Cruise Control feature cannot be enabled unless the normal Cruise Control feature is also enabled.
Feature / Parameter
Cruise Control Enable - Feature Option
Cruise Control Maximum Vehicle Speed - Parameter
30 - 102 mph
Cruise Control Auto Resume - Feature Option
Cruise Control Save Set Speed - Feature
Cruise Control Lower Droop - Parameter
0 - 3 mph
Cruise Control Upper Droop - Parameter
0 - 3 mph
Engine Brake Cruise Control Activation - Feature Option
Cruise Control Speed Delta for Engine Brake Activation - Parameter
1 - 10 mph
Adaptive Cruise Control - Feature Option