Patent ID: 8035324

Claim:
A method for controlling a transmission operative to transfer power between an input member and first and second torque machines and an output member, the first and second torque machines connected to an energy storage device, the method comprising: determining a range of available power from the energy storage device and motor torque constraints for the first and second torque machines; providing power and coordinate relationships representing the range of available power from the energy storage device and the motor torque constraints for the first and second torque machines; transforming the power and coordinate relationships representing the range of available power from the energy storage device and the motor torque constraints for the first and second torque machines to a second coordinate system; simultaneously solving the transformed power and coordinate relationships representing the range of available power from the energy storage device and the motor torque constraints for the first and second torque machines; and determining an achievable operating region for the transmission in the second coordinate system based upon the simultaneously solved transformed power and coordinate relationships.