scholarly journals Gain-scheduled Non-linear Servo Controller for Toroidal Continuously Variable Transmission

2003 ◽  
Vol 39 (9) ◽  
pp. 827-834
Author(s):  
Taketoshi KAWABE ◽  
Shinichiro JOE ◽  
Michel MENSLER
Author(s):  
S M Savaresi ◽  
F Taroni ◽  
F Prevedi ◽  
S Bittanti

In this work, a power-split continuously variable transmission (CVT) used in high-power tractors is considered. Power-split CVTs are characterized by the combination of a traditional discontinuous mechanical transmission and a continuously variable transmission. This provides, at the same time, smooth variations of the transmission ratio and high efficiency of the overall transmission system. The CVT considered in this paper is a hydrostatic power-split unit conceived for top-power agricultural tractors. The goal of this paper is to present a case study on the design and tuning of the control system structure for this type of CVT. This structure consists of three main parts: a servo controller on the internal current of the valve of the hydraulic transmission; a servo controller on the hydraulic transmission ratio; a synchronizer which coordinates the hydraulic and the mechanical parts of the CVT. The design, tuning and testing of this set of automatic controllers is presented.


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