We present an experimental investigation of the pushing V-belt CVT dynamics with the aim of comparing the experimental data with the theoretical predictions of the Carbone, Mangialardi, Mantriota (CMM) model(1). A very good agreement between theory and experiments is found. In particular it is shown that, during creep-mode (slow) shifting, the rate of change of the speed ratio depends linearly on the logarithm of the ratio between the axial clamping forces acting on the two movable pulleys. The shifting speed is also shown to be proportional to the angular velocity of the primary pulley. The results of this study are of utmost importance for the design of advanced CVT control systems and the improvement of the CVT efficiency, cars' drivability andfuel economy.
The CMM model of belt-CVT dynamics / Carbone, Giuseppe; Mangialardi, Luigi; Veenhuizen, P. A.; DE NOVELLIS, L.. - (2007). (Intervento presentato al convegno CVT - HYBRID 2007 Congress tenutosi a Yokohama Japan nel September 12 -14, 2007).
The CMM model of belt-CVT dynamics
CARBONE, Giuseppe;MANGIALARDI, Luigi;
2007-01-01
Abstract
We present an experimental investigation of the pushing V-belt CVT dynamics with the aim of comparing the experimental data with the theoretical predictions of the Carbone, Mangialardi, Mantriota (CMM) model(1). A very good agreement between theory and experiments is found. In particular it is shown that, during creep-mode (slow) shifting, the rate of change of the speed ratio depends linearly on the logarithm of the ratio between the axial clamping forces acting on the two movable pulleys. The shifting speed is also shown to be proportional to the angular velocity of the primary pulley. The results of this study are of utmost importance for the design of advanced CVT control systems and the improvement of the CVT efficiency, cars' drivability andfuel economy.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
