IMPROVED DIGITAL HYDRAULIC TRACKING CONTROL OF WATER HYDRAULIC CYLINDER DRIVE

Authors

  • Matti Linjama Institute of Hydraulics and Automation, Tampere University of Technology, P.O. BOX 589, FIN-33010, Tampere, Finland
  • Matti Vilenius Institute of Hydraulics and Automation, Tampere University of Technology, P.O. BOX 589, FIN-33010, Tampere, Finland

Keywords:

pulse code modulation, on/off control, tracking control

Abstract

A position tracking control system is implemented by utilizing parallel-connected on/off valve series. The pulse code modulation method is used to achieve stepwise flow control and four valve series, each having four two-way solenoid valves, are used. A cost function based controller is used to control simultaneously and independently flow paths from supply to cylinder chambers and from chambers to tank. It is shown that controllability can be improved especially at low velocities by allowing three or four valve series to be open simultaneously instead of using classical inflowoutflow control.

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Author Biographies

Matti Linjama, Institute of Hydraulics and Automation, Tampere University of Technology, P.O. BOX 589, FIN-33010, Tampere, Finland

Matti Olavi Linjama (born 4th July 1971) is Academy Research Fellow and works at the Institute of Hydraulics and Automation (IHA), Tampere University of Technology (TUT), Finland. He graduated as Dr. Tech. in 1998. His current research focuses on development of advanced water and oil hydraulic on/off control systems.

Matti Vilenius, Institute of Hydraulics and Automation, Tampere University of Technology, P.O. BOX 589, FIN-33010, Tampere, Finland

Matti Juhani Vilenius (Born 25th March 1948) is Professor and Head of the Institute of Hydraulics and Automation (IHA) at Tampere University of Technology (TUT), Finland. He graduated as Dr. Tech. in 1980. Since 1971 he has been acting in many kinds of R&D positions inside and outside TUT. He has long experience as an academic level teacher and supervisor as well as an organizer of international conferences. He has published more than 200 technical and scientific papers.

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Published

2005-03-01

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