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Mathematical Problems in Engineering
Volume 2013, Article ID 617054, 9 pages
http://dx.doi.org/10.1155/2013/617054
Research Article

Angle Displacement Robust Controller for the Port Plate of the Hydraulic Transformer

1School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150080, China
2College of Automation, Harbin Engineering University, Harbin 150001, China
3Department of Engineering, Faculty of Technology and Science, University of Agder, 4898 Grimstad, Norway

Received 21 August 2013; Accepted 15 October 2013

Academic Editor: Tao Li

Copyright © 2013 Wei Shen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The hydraulic transformer is used in the hydraulic system to enhance the efficiency. However, how to control the angle displacement of the port plate is becoming a critical issue because of the new structure of the hydraulic transformer. This paper presents a new method for the angle displacement control system. Firstly, the basic principle of the system is presented. Then, the disturbance which is mainly the friction torque between the port plate and the cylinder block is calculated to estimate the range. Furthermore, the guaranteed cost control (GCC) is analyzed and combined with the disturbance and the characteristics of parameter uncertainties. Finally, the proposed control method is compared with the traditional PI control and the simulation result shows the effectiveness of the proposed design method.