We present a novel model of metal belt CVTs recently developed by Carbone, Mangialardi, Mantriota (CMM) model [Carbone et. al, 2005]. The theoretical prediction are compared with the experimental observation and a very good agreement between theory and experiments is found. /n 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 and fuel economy.
The CMM model of metal belt CVTs
CARBONE, Giuseppe;MANGIALARDI, Luigi;MANTRIOTA, Giacomo
2007
Abstract
We present a novel model of metal belt CVTs recently developed by Carbone, Mangialardi, Mantriota (CMM) model [Carbone et. al, 2005]. The theoretical prediction are compared with the experimental observation and a very good agreement between theory and experiments is found. /n 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 and fuel economy.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
