Prediction of CVT Transmission Efficiency by Metal V-Belt and Pulley Behavior with Feedback Control

Paper #:
  • 2010-01-0855

Published:
  • 2010-04-12
Citation:
Saito, T. and Miyamoto, K., "Prediction of CVT Transmission Efficiency by Metal V-Belt and Pulley Behavior with Feedback Control," SAE Technical Paper 2010-01-0855, 2010, https://doi.org/10.4271/2010-01-0855.
Pages:
9
Abstract:
A simulation technology has been developed to predict the transmission efficiency of a metal pushing V-belt and pulleys that make up the drive system of a continuously variable transmission (CVT). When a CVT operates in an actual vehicle, pulley thrust pressure is adjusted by feedback control to maintain a speed ratio. This feedback control has been implemented, for the first time, in an existing simulation that predicts the dynamic behavior of a metal V-belt using explicit structural analysis. The new simulation enables stable control of a target speed ratio when appropriate gains are set for each analysis condition. Using this simulation, the following values can be obtained: 1) pulley thrust pressure that is necessary for maintaining a specified speed ratio but could previously be derived only from physical testing, 2) transmission efficiency of a CVT drive system, consisting of a metal pushing V-belt and pulleys, at each operating condition, and 3) belt friction losses calculated from sliding velocities and friction forces applied to element contact surfaces.
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