Drivetrain system having rate-limited feedforward fueling

A method of controlling a drivetrain system, comprising:

• determining a change in loading on an electric traction motor;
• determining an anticipated change in loading on an engine based on the determined change in loading on the traction motor;
• determining a change in fueling of an engine that will be required to accommodate the change in loading on the electric traction motor;
• selectively rate-limiting the change in fueling by rate-limiting a value of the anticipated change in loading on the engine;
• and
• implementing the selectively rate-limited change in fueling prior to transmission of the change in loading on the electric traction motor to the engine.

A mobile machine, comprising:

• an engine;
• a generator mechanically driven by the engine to produce electric power;
• a traction device;
• a motor configured to consume the electric power and drive the traction device;
• and
• a controller in communication with the engine, the generator, and the motor, the controller being configured to:
• determine a change in loading on the motor;
• determine an anticipated change in loading on the engine based on the change in loading on the motor;
• selectively rate-limit the anticipated change in loading on the engine only during travel of the mobile machine in a single direction when the change in loading on the motor is a reduction less than a threshold amount;
• determine a first change in fueling of the engine based on the rate-limited and anticipated change in loading on the engine;
• determine a second change in engine fueling based on a difference between an actual speed of the engine and a desired speed of the engine;
• sum the first and second changes in fueling of the engine;
• selectively limit the sum of the first and second changes in fueling based on one of a smoke limit and a maximum torque limit and selectively rate-limit the first change in fueling of the engine by rate-limiting a value of the anticipated change in loading on the engine;
• and
• implement the selectively limited sum of the first and second changes in fueling.

A drivetrain system, comprising:

• an engine;
• a traction motor operatively driven by the engine;
• and
• a controller in communication with the engine and the traction motor, the controller being configured to:
• determine a change in loading on the traction motor;
• determine an anticipated change in loading on the engine based on the determined change in loading on the traction motor;
• determine a change in fueling of the engine that will be required to accommodate the change in loading on the traction motor;
• selectively rate-limit the change in fueling by rate-limiting a value of the anticipated change in loading on the engine;
• and
• implement the rate-limited change in fueling prior to transmission of the change in loading on the traction motor to the engine.