Transmission-mounted combined energy recovery drive

A powertrain system for a parallel mild hybrid vehicle, the system comprising:

• an engine;
• a transmission comprising a power take-off shaft;
• a master clutch controllably and selectively coupling the engine and the transmission;
• and
• a combined energy recovery drive operatively coupled to the power take-off shaft of the transmission and to a waste heat recovery turbine;
• a first shaft operatively coupled to the power take-off shaft;
• a second shaft operatively coupled to a motor-generator and to the waste heat recovery turbine;
• an alternative power source drive coupled to the second shaft and the waste heat recovery turbine operatively, the alternative power source drive coupling the motor-generator to the waste heat recovery turbine;
• a first gear train operatively coupled to the motor-generator and to the second shaft;
• a second gear train operatively coupled to the first shaft and to the second shaft;
• a clutch assembly positioned on the second shaft between the first gear train and the second gear train, the clutch assembly configured to selectively couple and decouple the alternative power source drive, the second shaft, and the motor-generator from the first shaft,
• wherein the combined energy recovery drive is structured to generate energy from inertia of the parallel mild hybrid vehicle when the engine is decoupled from the transmission via the master clutch.

A method of recovering or providing energy in a parallel mild hybrid vehicle, the method comprising:

• coupling a combined energy recovery drive to a transmission of an engine via a first shaft, the first shaft in rotational communication with a first gear train;
• coupling the combined energy recovery drive to a waste heat recovery turbine via a second shaft, the second shaft in rotational communication with a second gear train;
• selectively coupling the first shaft and the second shaft via a master clutch, an engaged position of the master clutch comprising the master clutch in rotational communication with the first shaft and the second gear train, and a disengaged position of the master clutch comprising the master clutch not in rotational communication with the first shaft and the second gear train;
• and
• selectively coupling, by a clutch assembly, the second shaft to a motor-generator to provide torque from the waste heat recovery turbine via an alternative power source drive to the motor generator, the clutch assembly being positioned on the second shaft between the first gear train and the second gear train.