Belt drive system with forward fed torsional load adjustment

A belt drive system for an internal combustion engine rotatably coupled to a rotary motor, the internal combustion engine including at least three cylinders each having a piston operable to turn a crankshaft, the belt drive system comprising:

• a belt disposed in a belt run that includes a first pulley coupled to a crankshaft of the internal combustion engine and a second pulley coupled to the rotary motor;
• and
• a controller operatively connected to the rotary motor and including data processing hardware and memory hardware, the memory hardware storing instructions that when executed on the data processing hardware cause the data processing hardware to perform operations comprising:
• applying a torque to the rotary motor;
• and
• changing the torque of the rotary motor prior to a change in a rotary speed of the internal combustion engine to maintain a predetermined tension in the belt and reduce a rotary motor torsional response through the belt to a torsional vibration input from the engine.