The present IVT (Infinitely Variable Transmission) is built around a full toroidal variator where high forces acting on low inertia characterize it as a smooth and responsive system. Because of the complex and frequent motions of the rollers, the variator dynamics plays a key role in the transmission. Furthermore, the IVT requires detailed description of the interactions between variator, driveline and hydraulic for an optimum control development. Accurate variator dynamic investigation is therefore a vital element of the modeling requirement. A complete one-roller model of a full toroidal variator including mechanic and hydraulic parts is presented in this paper. The roller movement is described in response to a torque and a speed ratio change. A sixroller model is then introduced to highlight the difference between the rollers behavior. It has been shown that the highly dynamic behaviors of the variator due to frequent movements of its rollers as well as the complex interactions between variator and other components of the driveline justify an accurate dynamic investigation. The modeling approach presented gives a modular tool for control development, as well as transmission and driveline simulation. The simulation results have shown the torque-controlled variator as a fast and self-balancing system with remarkable dynamic performances. The step responses were similar to a second order system with a settling time of about 200 ms.
Full toroidal IVT variator dynamics
Variatordynamik eines toroidalen (IVT) stufenlosen Getriebes
2002
10 Seiten, 18 Bilder, 6 Quellen
Conference paper
English
Full toroidal IVT variator dynamics
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