Abstract: A hybrid powertrain system includes an engine, an electric machine, a power electronics device including a plurality of electric circuit layers, and a cooling system. A method for managing thermal energy in the power electronics device includes monitoring a plurality of temperature sensors in the power electronics device, monitoring electric power into and out of the power electronics device, predicting temperatures for the plurality of electric circuit layers, and controlling the hybrid powertrain system based upon the predicted temperatures for the plurality of electric circuit layers.

Abstract: A method for determining a voltage level across an electrical circuit of a powertrain includes measuring a plurality of voltage levels and utilizing a comparison test between at least two voltage levels of the plurality of voltage levels to determine the circuit voltage level.