Method and control architecture to determine motor torque split in fixed gear operation for a hybrid powertrain system

摘要

An electro-mechanical transmission (10) is operative to transmit mechanical torque originating from an engine (14) and first and second electric machines (56,72) to an output member (64). The electric machines (56,72) are electrically-operatively connected to an energy storage system (74) for electrical power flow therebetween. A Method for operating the electro-mechanical transmission (10) includes operating the electro-mechanical transmission (10) in a fixed gear operating range state, determining a minimum power flow between the energy storage system (74) and the first and second electric machines (56,72) to meet an operator torque request based upon electrical power constraints and motor torque constraints, commanding a motor torque from the first electric machine (56) based upon the minimum power flow, and commanding a motor torque from the second electric machine (72) based upon the minimum power flow, a torque input from the engine (14) and the commanded motor torque from the first electric machine (56) to meet the operator torque request in the fixed gear operating range state.