Patent ID: 8290681

Claim:
Method for controlling a powertrain comprising an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and an electric machine, said method comprising: monitoring a desired input speed of an input shaft of the transmission; signal processing said desired input speed to create a lead control signal to control said engine, wherein said signal processing comprises low pass filtering said desired input speed, and applying system constraint limits upon said desired input speed; signal processing said desired input speed to create an immediate control signal to control said electric machine, wherein said signal processing comprises delaying said desired input speed by a lead period, low pass filtering said desired input speed, and applying system constraint limits upon said desired input speed; and controlling said powertrain through a powertrain transition based upon said lead control signal and said immediate control signal; wherein the engine and the electric machine simultaneously transmit torque independently to the transmission through separate inputs; and wherein a speed of the engine and a speed of the electric machine change independently.