Patent ID: 8249766

Claim:
Method for controlling a hybrid transmission operative to transfer power between an input member and first and second torque machines and an output member in a fixed gear operating range state, the first and second torque machines connected to an energy storage device, the method comprising: determining an output torque command at the output member; determining motor torque constraints for the first and second torque machines and determining power constraints for the energy storage device; iteratively selecting candidate input torques transferable to the input member and associated output torques; determining a second torque constraint associated with the candidate input torque; determining a third torque constraint associated with the candidate input torque; and determining a preferred input torque comprising the candidate input torque that achieves the commanded output torque at the output member and satisfies the motor torque constraints for the first and second torque machines, satisfies the power constraints for the energy storage device, and satisfies the second and third torque constraints associated with the candidate input torque when operating in the fixed gear operating range state.