Patent ID: 7024299

Claim:
Method for determining output torque limits in a vehicular powertrain comprising an engine, an electrically variable transmission including at least one electric motor, an electrical storage device and a driveline, said engine operatively coupled to the electrically variable transmission at an input thereof, said driveline operatively coupled to the electrically variable transmission at an output thereof, comprising: determining a feasible motor torque operating space; determining a first set of output torque limits within the feasible motor torque operating space based upon predetermined motor torque limits and predetermined engine torque limits; determining a second set of output torque limits within the feasible motor torque operating space based upon predetermined electrical storage device power limits and said predetermined motor torque limits; determining a third set of output torque limits within the feasible motor torque operating space based upon said predetermined electrical storage device power limits and said predetermined engine torque limits; and determining overall output torque limits of the powertrain as the most constrained of output torques from the first, second and third sets of output torque limits.