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SWITCHING FROM VELOCITY TO FORCE CONTROL FOR THE ELECTRO-HYDRAULIC SERVOSYSTEM BASED ON LPV SYSTEM MODELING
Takahiro Sugiyama*,** Kenko Uchida**
* Moog Japan Ltd., Engineering Group, 1-8-37 Nishi Shindo,
Kanagawa 254-0019, Japan
** Department of Electrical, Electronics and Computer
Engineering, Waseda University, Tokyo 169-8555, Japan
In the hydraulic system, it is often that switch the control mode over from one to the other, such as from position to velocity or from velocity to force. In this paper, we propose a flow calculation formula for the flow control valve in order to have an LPV system representation. Then, design gain scheduled controllers for the velocity and the force individually. During a switching mode, a control is generated by adding two controller outputs with appropriate ratios. Usefulness of this approach is shown by the experiment results, which are obtained from Injection molding machine application.
Keywords: Injection molding, Electro-hydraulic systems, LPV System, H-infinity, Switching algorithms
Session slot T-Tu-A16: Controller Design Studies (Aeronautics and Hydraulics)/Area code 2a : Control Design
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