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Control system design on a power-split CVT for high-power agricultural tractors

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4 Author(s)
Savaresi, S.M. ; Dipt. di Elettronica e Informazione, Politecnico di Milano, Italy ; Taroni, F.L. ; Previdi, F. ; Bittanti, S.

The problem considered in this paper is the design and tuning of the control system of a power-split continuously variable transmission (CVT) used in high-power tractors. Power-split CVTs are characterized by the combination of a traditional mechanical transmission and by a continuously-variable transmission. This guarantees, at the same time, smooth variations of the transmission-ratio and high efficiency of the overall transmission system. The control architecture of an hydrostatic power-split CVT is constituted by three main parts: 1) servo-controller on the current of the valve which drives the hydraulic transmission; 2) a servo-controller on the hydraulic transmission-ratio; and 3) a synchronizer which coordinates the hydraulic and the mechanical parts of the CVT. In this work, these three controllers are fully developed, including: design, implementation, and evaluation on an experimental system.

Published in:

Mechatronics, IEEE/ASME Transactions on  (Volume:9 ,  Issue: 3 )

Date of Publication:

Sept. 2004

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