Patent ID: 8825320

Claim:
Method for controlling a powertrain comprising an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and an electric machine, said transmission configured to transmit mechanical power to an output member in one of a plurality of fixed gear and continuously variable operating range states, the method comprising: monitoring an output speed and an operator torque request; for each of a plurality of potential destination operating range states: determining a respective output member deceleration through a respective synchronous transmission shift to achieve the respective potential destination operating range state, determining a respective input speed profile based upon said respective output member deceleration, the output speed, and the operator torque request through said respective synchronous transmission shift, and determining a respective penalty cost based upon said respective input speed profile; and executing in a control module one of said respective synchronous transmission shifts to the corresponding one of said plurality of potential destination operating range states based upon said respective penalty costs.