Patent ID: 8224514

Claim:
A method for controlling operation of a hybrid powertrain system based upon electric power limits for an electric energy storage device, comprising: providing long term power limits of the electric energy storage device; determining short term power limits of the electric energy storage device based upon the long term power limits; monitoring electric energy storage device power flow; controlling power output of the hybrid powertrain system based upon the short term power limits of the electric energy storage device during an electrical energy storage device power excursion outside of the long term power limits; and converging the short term power limits to the long term power limits when at least one of an energy area metric reaches a predetermined energy area metric threshold, the energy area metric comprising a measure of the electrical energy storage device power flow exceeding the long term power limits over an elapsed period of time, and a monitored elapsed time reaches a predetermined time threshold wherein the electrical energy storage device power flow exceeds the long term power limits.