Engine accessory drive system

An engine accessory drive (EAD) system for an internal combustion engine, the system comprising:

• a motor-generator unit (MGU) configured to selectively operate as an electric generator and an electric motor, the MGU operably coupled to an energy storage system;
• a gearbox assembly operably coupled to the MGU and to an output of the engine;
• an EAD controller in operative communication with each of the MGU and the gearbox assembly, wherein the EAD controller is structured to:
• receive engine data indicative of an engine condition,
• receive state of charge data indicative of a state of charge of the energy storage system,
• interpret each of the engine data and the state of charge data, and
• selectively operate the EAD system in one of a generator mode and an accessory drive mode based on the interpreted engine data and state of charge data.

A method, comprising:

• providing an engine accessory drive (EAD) controller operably coupled to each of an internal combustion engine and an EAD system, the EAD system including:
• a motor-generator unit (MGU) configured to selectively operate as an electric generator and an electric motor,
• an energy storage system operably coupled to the MGU, and
• a gearbox assembly operably coupled to the MGU and to an output of the engine;
• receiving, by the EAD controller, engine data indicative of an engine condition;
• receiving, by the EAD controller, state of charge data indicative of a state of charge of the energy storage system;
• interpreting, by the EAD controller, each of the engine data and the state of charge data;
• and
• selectively operating, by the EAD controller, the EAD system in one of a generator mode and an accessory drive mode.