System constraints method of controlling operation of an electro-mechanical transmission with two external input torque ranges

摘要

A method to control an electro-mechanical transmission (10) mechanically-operatively coupled to an internal combustion engine (14) and first (56) and second (72) electric machines to transmit power to an output member (64) includes determining motor torque constraints and battery power constraints. A preferred output torque to an output member (64) is determined that is achievable within the motor torque constraints and is achievable within a range for a first torque input and is achievable within a range for a second torque input and is based upon the battery power constraints.