Patent ID: 7680567

Claim:
A method for attenuating dynamic oscillatory inertia torque disturbances in a powertrain for a hybrid electric vehicle, the powertrain having a first power source comprising an engine, a second power source comprising an electric motor electrically coupled to a battery and a generator, and gearing establishing a mechanical power flow path between the engine and the generator, the method comprising the steps of: determining a desired vehicle wheel torque and an engine speed command in response to a driver demand for driving torque; determining a generator torque command as a function of the engine speed command; determining a motor torque command as a function of the desired vehicle wheel torque and the generator torque command; calculating an engine power estimate as a function of desired vehicle wheel torque, motor torque command and generator torque command; and filtering the engine power estimate using a weighted filtering factor that is dependent upon motor speed to obtain a final engine power estimate whereby oscillatory torque disturbances in the powertrain are attenuated.