Features and Parameters

Load Base Speed Control (LBSC) is available with ISX and ISM engines.

Default Settings

Engine

Low

High

ISM

2500 RPM

2500 RPM


When automatic transmissions are spec’d, LBSC is disabled and the transmission’s shift schedule controls the RPM range the engine operates based on vehicle speed and acceleration pedal actuation percent. For Automated Manual Transmissions, the Load Based Speed Control default values determine the RPM operating range when the transmission is in “Manual” Mode. Transmission shift schedule (calibration) prevails when in “Drive” mode.

To use the LBSC feature, the electronic parameters 'High Engine Speed Breakpoint' and 'Low Engine Speed Breakpoint' must be adjusted to the desired values.


Adjustment of the LBSC parameters can be accomplished with PowerSpec.

To enjoy the full benefit of Load Based Speed Control, the Cummins Road Speed Governor (RSG) and Gear Down Protection (GDP) features should also be enabled and properly set. PowerSpec incorporates a function to assist in determining optimized settings.

 For pre-EPA 2010 diesel and current natural gas platforms, LBSC requires two engine breakpoints to be set.


High Engine Speed Breakpoint
Specify the maximum engine speed during normal, but high load conditions when operating in the lower transmission gears.

Low Engine Speed Breakpoint
Specify the maximum engine speed during normal, but low load operating conditions when operating in the lower transmission gears.

*Not including vocational ratings

For Gas and Pre-2013 Engines:

Engine Break Seed Points for preferred Operational Goal

 

Fuel Economy

Balance

Engine

Low

High

Low

High

ISM

1600 RPM

1700 RPM

1700 RPM

1800 RPM