Modeling and torque estimation of an automotive Dual Mass Flywheel

The dual mass flywheel (DMF) is primarily used for dampening of oscillations in automotive powertrains and to prevent gearbox rattling. TWs paper explains the DMF mechanics along with its application and components. Afterwards a detailed ab-initio model of the DMF dynamics is presented. This mainly includes a model for the two arc springs in the DMF and their friction behavior. Both centrifugal effects and redirection forces act radially on the arc spring which induces friction. A numerical simulation of the DMF model is compared to measurements for model validation. Finally the observability of the engine torque using the DMF is discussed. For this purpose a linear torque observer is proposed and evaluated.