Features and Parameters
By turning the energy producing ISB into an energy absorbing air compressor, the engine becomes a highly effective brake on the drivetrain which slows the vehicle. The integrated Engine Compression Brake utilizes the energy from the engine to become a highly effective brake on the drivetrain when necessary which in turn slows the vehicle.
Once installed, the Engine Compression Brake only becomes available to the driver when the cab mounted Engine Brake On/Off switch is set to ON. A second cab mounted switch is provided to control the braking power level when the Engine Compression Brake is activated.
With the Engine Brake switch set to ON, automatic activation of the Engine Compression Brake will occur provided the following conditions are met:
The cab mounted Engine Brake On/Off switch must be set to ON.
Clutch Pedal must be released
Service Brake Pedal must be released
Accelerator Pedal must be fully released
Cruise control must not be performing an AutoResume
PTO/Remote PTO feature must not be active
Top 2 Transmission feature must not be active
Vehicle speed must be greater than Engine Brake Minimum Vehicle Speed.
Increased flexibility is provided through various options and programmable parameters that allow the user to tailor Engine Brake application and operation to best suit the driving conditions prevailing. These options can be accessed using Cummins PowerSpec configuration tool, and allow the user to modify the method of Engine Brake actuation, and automatic activation while vehicle is in cruise control.
Engine Brake Cruise Control Activation
The Engine Brake Cruise Control Activation feature permits the Cruise Control feature to automatically engage the Engine Compression Brake should the selected vehicle speed be exceeded while the Cruise Control feature is controlling the engine. This reduces driver workload and thereby encourages use of the Cruise Control feature.
Cruise Control Speed Delta for Minimum Engine Brake
With the engine controlled by the Cruise Control feature, the Cruise Control Speed Delta for Minimum Engine Brake parameter specifies the amount that the vehicle can increase above the selected Cruise Control vehicle speed before the minimum level of available Engine Compression Brake is automatically activated.
The Cruise Control Speed Delta for Minimum Engine Brake parameter should be set at least 1 MPH greater than the Cruise Control Lower droop parameter so as not to interfere with normal Cruise Control speed fluctuations. This is a Cruise Control parameter and is programmed during the configuration of the Cruise Control feature.
Feature / Parameter
Engine Brake Cruise Control Activation - Feature Option
Cruise Control Speed Delta for Minimum Engine Brake - Parameter
1.5 - 4.0 mph