The variator in a pushbelt continuously variable transmission (CVT) enables a stepless variation of the transmission ratio within a finite range. Nowadays, the variator is electronically controlled and the variator control objectives are twofold: 1) tracking a transmission ratio reference; 2) optimizing the variator efficiency. Recently, the extremum seeking control (ESC) technique is exploited in view of optimizing the variator efficiency, which only uses measurements from sensors that are standard. However, the operating conditions are fixed and tracking a transmission ratio reference is omitted, for simplicity. In this paper, extensions are proposed that overcome these limitations. This is achieved via the construction of a disturbance feedforward control design and a speed ratio control design. Experiments illustrate the effectiveness of these extensions when the operating conditions are varied and tracking a transmission ratio reference is required.
|Title of host publication
|Proceedings of the 6th International Conference on Continuously Variable and Hybrid Transmissions (CVT2010), 17-19 November, Maastricht The Netherlands
|Place of Publication
|Published - 2010