Title: The Empact CVT: modelling, simulation and experiments

Authors: Tim W.G.L. Klaassen, Bram Bonsen, Koen G.O. Van De Meerakker, Bas G. Vroemen, P.A. Veenhuizen, Frans E. Veldpaus, Maarten Steinbuch

Addresses: Department of Mechanical Engineering, Technische Universiteit Eindhoven, Den Dolech 2, Eindhoven 5600 MB, The Netherlands. ' Department of Mechanical Engineering, Technische Universiteit Eindhoven, Den Dolech 2, Eindhoven 5600 MB, The Netherlands. ' Department of Mechanical Engineering, Technische Universiteit Eindhoven, Den Dolech 2, Eindhoven 5600 MB, The Netherlands. ' Department of Mechanical Engineering, Technische Universiteit Eindhoven, Den Dolech 2, Eindhoven 5600 MB, The Netherlands. ' Department of Mechanical Engineering, Technische Universiteit Eindhoven, Den Dolech 2, Eindhoven 5600 MB, The Netherlands. ' Department of Mechanical Engineering, Technische Universiteit Eindhoven, Den Dolech 2, Eindhoven 5600 MB, The Netherlands. ' Department of Mechanical Engineering, Technische Universiteit Eindhoven, Den Dolech 2, Eindhoven 5600 MB, The Netherlands

Abstract: This paper shows the implementation of a simulation model for new electromechanically actuated metal V-belt type Continuously Variable Transmission (CVT), referred to as the Empact CVT. An analysis of the dynamics of the actuation system and of the driveline shows that the eigenfrequencies of the system depend on both the CVT ratio and the slip in the variator. An accurate variator model is required to incorporate all characteristic dynamics. The implemented variator model is an explicit formulation of a model which gives an estimation of the tension forces and compression forces in the pushbelt. The simulation model also includes slip, shifting losses based on transient variator models and friction. Simulations are compared to measurements, showing good results.

Keywords: continuously variable transmission; CVT; metal V-belt; electromechanical actuation; power train modelling; variator modelling; dynamical analysis; simulation; experimental validation; driveline dynamics; tension forces; compression forces.

DOI: 10.1504/IJMIC.2008.020126

International Journal of Modelling, Identification and Control, 2008 Vol.3 No.3, pp.286 - 296

Published online: 28 Aug 2008 *

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