Plug-in hybrid architecture for off-highway machines

A hybrid power generation system for an off-highway machine having traction motors for moving the off-highway machine over terrain and having at least one hydraulically powered implement for moving materials, the hybrid power generation system comprising:

• a gearbox;
• a hydrostatic pump mechanically coupled to the gearbox and hydrostatically coupled to the traction motors;
• a hydraulic pump mechanically coupled to the gearbox and hydraulically coupled to the hydraulically powered implement;
• an internal combustion engine;
• a first clutch coupled to the engine and coupled to the gearbox, the first clutch selectively engageable to mechanically couple the engine to the gearbox;
• a motor/generator;
• a second clutch coupled to the motor/generator and coupled to the gearbox, the second clutch selectively engageable to mechanically couple the motor/generator to the gearbox;
• an energy storage system electrically coupled to the motor/generator;
• a control system configured to control the first clutch and the second clutch to provide multiple modes of operation, wherein:
• in a first mode of operation, the first clutch is engaged to couple the engine to the gearbox, and the second clutch is engaged to couple the motor/generator to the gearbox;
• in a second mode of operation, the first clutch is disengaged to decouple the engine from the gearbox, and the second clutch is engaged to couple the motor/generator to the gearbox;
• and
• in a third mode of operation, the first clutch is engaged to couple the engine to the gearbox, and the second clutch is disengaged to decouple the motor/generator from the gearbox.