Patent ID: 8731762

Claim:
A method of controlling a powertrain system including an electro-mechanical transmission, an internal combustion engine, and a turbocharger, comprising: determining a torque request; selecting feasible input torque operating points; calculating aggregate system power losses corresponding to the selected feasible input torques and input speed capable of producing a desired output torque based on the torque request; determining turbo efficiency as a function of a difference between a feasible input torque rate of change and a desired input torque rate of change required to reach the desired output torque within a predetermined amount of time; summing the turbo efficiency to the aggregate system power losses to determine total system losses corresponding to feasible input torques capable of producing the desired output torque; determining a feasible input speed and input torque corresponding to a substantially minimum total system power loss; and selecting as a desired input speed and input torque that corresponds to the substantially minimum total system power loss.