Hybrid electric powertrian system with e-accessory drive and associated power sharing architecture

A hybrid electric powertrain system comprising:

• a transmission having an input member and an output member, wherein the output member is connected to a load;
• an electrically-powered accessory (e-accessory) powered via a secondary motor torque in response to an accessory torque demand;
• an internal combustion engine providing an engine torque;
• a primary electric machine providing a primary motor torque, wherein the internal combustion engine and the primary electric machine are connected to the input member and are configured, alone or in combination, to provide input drive torque to the input member;
• a secondary electric machine providing a secondary motor torque, the secondary electric machine being connected to the e-accessory and satisfying the accessory torque demand;
• a first clutch disposed between the secondary electric machine and the input member, wherein the secondary electric machine is connected to the input member of the transmission when the first clutch is closed;
• and
• a controller configured, in response to an output torque request, to execute a power-sharing strategy using an objective cost function that allocates a respective contribution of the engine torque, the primary motor torque, and the secondary motor torque to the input member to satisfy the output torque request, and to simultaneously satisfy the accessory torque demand via the secondary electric machine.