Modeling and simulation of an electro-mechanically actuated pushbelt type continuously variable transmission

For analysis, control design and testing of an electro-mechanically actuated CVT, a simulation model is built. The model incorporates all major driveline components and a new proposed actuation system with servomotor actuation. The clamping forces in the variator are calculated using an explicit formulation of a model based on Coulomb friction. The model also includes slip and shifting losses based on transient variator models. Results show realistic behavior of the CVT. In comparison with a conventional hydraulically actuated CVT, this electromechanical system consumes very little power and achieves a high actuation performance