A Gain Scheduled Non-linear Servo Controller for a Toroidal Continuously Variable Transmission

2002 ◽  
Vol 6.1 (0) ◽  
pp. 367-372 ◽  
Author(s):  
Taketoshi Kawabe ◽  
Shinichiro Joe ◽  
Michel Mensler
Keyword(s):  
Continuously Variable Transmission ◽  
Non Linear ◽  
Variable Transmission ◽  
Servo Controller ◽  
Gain Scheduled

On the design and tuning of the controllers in a power-split continuously variable transmission for agricultural tractors

2003 ◽  
Vol 217 (8) ◽  
pp. 745-759 ◽  
Author(s):  
S M Savaresi ◽  
F Taroni ◽  
F Prevedi ◽  
S Bittanti
Keyword(s):  
High Efficiency ◽  
Continuously Variable Transmission ◽  
System Structure ◽  
Transmission Ratio ◽  
Mechanical Transmission ◽  
Power Split ◽  
Variable Transmission ◽  
Servo Controller ◽  
Automatic Controllers ◽  
Agricultural Tractors

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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