Patent ID: 7977896

Claim:
Method to determine a limit torque associated with an electro-mechanical transmission operatively coupled to first and second electric machines electrically connected to an electrical energy storage device to transfer mechanical power to an output member, comprising: monitoring operation of the electro-mechanical transmission; determining motor torque constraints of the first and second electric machines and battery power constraints for the electrical energy storage device; determining a limit torque function and identifying an original form of the limit torque function; transposing the limit torque function to a standard form; transposing the motor torque constraints and the battery power constraints; determining a transposed limit torque in the standard form based upon the transposed limit torque function and the transposed motor torque constraints and the transposed battery power constraints; and retransposing the transposed limit torque from the standard form to the original form to determine the limit torque in the original form.