PERFORMANCE LIMITATIONS OF A CLASS OF TWO-STAGE ELECTRO-HYDRAULIC FLOW VALVES

Authors

  • Rong Zhang Department of Mechanical and Industrial Engineering, University of Illinois, Urbana-Champaign, 1206 W Green Street, Urbana, IL 61801, USA
  • Andrew G. Alleyne Department of Mechanical and Industrial Engineering, University of Illinois, Urbana-Champaign, 1206 W Green Street, Urbana, IL 61801, USA
  • Eko A. Prasetiawan AAC Division of Belcan Corporation, P.O. Box 1875, Caterpillar Inc. Technical CenterE-900, Peoria, IL 61656, USA

Keywords:

electro-hydraulic, valve, valvistor, zero, model

Abstract

By examining the dynamics of a popular type of two-stage electronic proportional valve, this paper addresses its performance limitations, with both cautions in control implementation and suggestions in valve design. While several benefits do exist, there are limitations to the closed loop performance of the valve when it is included in a valve-controlled electro-hydraulic system. These limitations come from the structural feature that the pilot flow not only con-trols but also contributes to the total flow. Although for steady state performance this design gives a higher flow effi-ciency, for dynamic performance it results in zeros in the open loop transfer function, which will limit the closed loop bandwidth of a flow control system. A non-linear analytical model of this particular type of valve is derived first. It is then simplified as a reduced order linear model with the inherit system zeros illustrated. Validation of the analysis is obtained by experimental results on a testbed.

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Author Biographies

Rong Zhang, Department of Mechanical and Industrial Engineering, University of Illinois, Urbana-Champaign, 1206 W Green Street, Urbana, IL 61801, USA

Rong Zhang received the B.S. degree in 1996 and M.S. degree in 1998, both from the Department of Automotive Engineering at Tsinghua Univer-sity, Beijing, China. He is currently working towards his Ph.D. degree in the Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign. His research interests are in multivariable control of non-linear systems and robust control of mechanical or fluid power systems.

Andrew G. Alleyne, Department of Mechanical and Industrial Engineering, University of Illinois, Urbana-Champaign, 1206 W Green Street, Urbana, IL 61801, USA

Andrew Alleyne Professor Alleyne received his Bachelor of Science in Engineering Degree from Prince-ton University in 1989 in Mechanical and Aerospace Engineering. He received his M.S. and Ph.D. degrees in 1992 and 1994, respec-tively, from The University of California at Berkeley. He joined the Department of Mechanical and Industrial Engineering at the University of Illinois, Urbana-Champaign in 1994. He is currently an Associate Professor in that department as well as an Associate Professor in the Coordinated Science Labora-tory of UIUC.

Eko A. Prasetiawan, AAC Division of Belcan Corporation, P.O. Box 1875, Caterpillar Inc. Technical CenterE-900, Peoria, IL 61656, USA

Eko Prasetiawan was born in Malang, Indonesia in 1973. He received BSc degree in December 1997 from Texas A&M University and MSc degree in January 2001 from University of Illinois at Urbana-Champaign. Both degrees are in Mechanical Engineering. He works currently as a project engineer with Belcan Corporation in the Automated Analysis Division.

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Published

2002-03-01

How to Cite

Zhang, R., Alleyne, A. G., & Prasetiawan, E. A. (2002). PERFORMANCE LIMITATIONS OF A CLASS OF TWO-STAGE ELECTRO-HYDRAULIC FLOW VALVES. International Journal of Fluid Power, 3(1), 47–53. Retrieved from https://journals.riverpublishers.com/index.php/IJFP/article/view/629

Issue

2002: Vol 03 Iss 1

Section

Original Article