Joško Deur, Darko Horvat, J. Asgari

Modeling of an Automotive Planetary Gear Set Based on Karnopp Model for Clutch Friction

Proceedings of 2003 ASME International Mechanical Engineering Congress and Exposition (IMECE 2003), Vol. 2, Washington, D.C., 2003
Planetary gear sets of automotive automatic transmissions include several hydraulic and one-way clutches. Clutch friction is traditionally described by the generalized Stribeck speed-dependent static function approximated by a steep straight line in the zero-speed region (so-called classical friction model). Another approach based on the Karnopp clutch friction model is proposed in this paper. Simulation results for park/reverse engagement and 1-2 upshift shows that the proposed gear set modeling method compared to the classical friction model-based method yields significant improvement with respect to simulation time, as well as accuracy.