Part-throttle performance optimization

A controller for controlling a machine having an engine and a drivetrain, to avoid engine lugging while optimizing engine performance when the engine is not lugging, the system comprising:

• an interface for receiving a commanded engine speed and for passing the requested engine speed to the engine;
• a speed shaping module for receiving the commanded engine speed from the interface and for generating a target engine speed that differs from the commanded engine speed;
• and
• an engine underspeed algorithm module for receiving the target engine speed from the speed shaping module, and for receiving a signal indicative of an actual engine speed, and for determining based on the target engine speed and the actual engine speed whether engine is lugging.

A machine having underspeed control, the machine comprising:

• an engine;
• a drivetrain;
• an implement;
• a parasitic load;
• and
• a controller for controlling the drivetrain, implement, and parasitic load, the controller further comprising:
• an interface for receiving a commanded engine speed and for passing the requested engine speed to the engine;
• a speed shaping module for receiving the commanded engine speed from the interface and for generating a target engine speed that is modified from the commanded engine speed;
• and
• an engine underspeed algorithm module for receiving the target engine speed from the speed shaping module, and for receiving a signal indicative of an actual engine speed, and for determining, based on the target engine speed and the actual engine speed, whether engine is lugging.