IMPLEMENTATION OF SINGLE FEEDBACK CONTROL LOOP FOR CONSTANT POWER REGULATED SWASH PLATE AXIAL PISTON PUMPS

Authors

  • Medhat K. Bahr Khalil Mechanical Engineering Department, Concordia University, 1455 De Maisonneuve Boulevard West, Montreal, Quebec H3G 1MG, Canada
  • Valery D. Yurkevich Mechanical Engineering Department, Concordia University, 1455 De Maisonneuve Boulevard West, Montreal, Quebec H3G 1MG, Canada
  • Jaroslav Svoboda Mechanical Engineering Department, Concordia University, 1455 De Maisonneuve Boulevard West, Montreal, Quebec H3G 1MG, Canada
  • Rama B. Bhat Mechanical Engineering Department, Concordia University, 1455 De Maisonneuve Boulevard West, Montreal, Quebec H3G 1MG, Canada

Keywords:

axial piston pump, constant power, PID, fuzzy

Abstract

Variable displacement pumps are often used in both industrial applications and mobile hydraulic machinery. In such pumps, flow rate is dictated by the system requirements. Mathematical model has been previously developed to simu-late the dynamic performance of the electrically controlled constant power regulated swash plate axial piston pump with conical cylinder blocks. The pump is currently equipped with a double negative feedback control loop with an inner control loop to control the position of proportional valve using PID controller. Consequently, the proportional valve distributes the control pressure across the two sides of a control piston that is mechanically attached to the pump swash plate in order to change the pump flow rate. The outer control loop is used to control the pump flow rate in accordance with the system pressure change in order to keep the constant power operation using PD controller. For the convenience of pump constant power operation, PD controller is tuned to keep limited power shocks on the pump drive motor during the transient periods. The selected PD parameters result in relatively reduced settling time. Consequently swash plate steady state vibration appears.

Purpose of this paper is to investigate features of the pump performance in view of an alternative control scheme. Counting on the relatively good open loop static characteristics of the proportional valve, a control scheme with a single control feedback loop is proposed to simplify the currently used control scheme. Using such single feedback control loop reduces the pump production cost and leads to have less responsive system that suppresses the steady state vibra-tion of the swash plate. Simulation results are verified experimentally and qualitatively compared with the results when the original control scheme is used. Results are presented and discussed.

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Author Biographies

Medhat K. Bahr Khalil, Mechanical Engineering Department, Concordia University, 1455 De Maisonneuve Boulevard West, Montreal, Quebec H3G 1MG, Canada

Medhat K. B. Khalil Mr. M. K. Bahr Khalil is a PhD candidate, Department of Mechanical and Industrial Engineering, Faculty of Engineering and Computer Science, Concordia University, Montreal, Canada. He obtained his B.Eng. (Mechanical Engineering) from Military Technical College, Egypt, in 1983. He ob-tained his M.Sc. (Mechanical Engineering) degree in 1989. His research interests are in fluid power control, automatic control and modeling, simulation and dynamics of physi-cal systems. He is a student member of both CSME and ASME.

Valery D. Yurkevich, Mechanical Engineering Department, Concordia University, 1455 De Maisonneuve Boulevard West, Montreal, Quebec H3G 1MG, Canada

Valery D. Yurkevich Valery D. Yurkevich received the M.S. degree in automation and Ph.D. degree in automatic control from the Novosibirsk State Technical University, Russia, in 1974 and 1986, respec-tively. He joined the faculty of Automation and Computer Sciences of the same University since 1979 and has been a Professor in Auto-mation Department since 1997. Recently, he is a Visiting Research Professor in Department of Mechanical and Industrial Engineering, Concordia University.

Jaroslav Svoboda, Mechanical Engineering Department, Concordia University, 1455 De Maisonneuve Boulevard West, Montreal, Quebec H3G 1MG, Canada

Jaroslav V. Svoboda Dr. Jaroslav V. Svoboda is a professor in the Department of Mechanical and Industrial Engineering, Faculty of Engineering and Computer Science, Concordia University, Montreal, Canada. His areas of research are control systems, hydraulic systems, flight and vehicle simulators.

Rama B. Bhat, Mechanical Engineering Department, Concordia University, 1455 De Maisonneuve Boulevard West, Montreal, Quebec H3G 1MG, Canada

Dr. Rama Bhat Dr. Rama Bhat is a Professor and Chair of the Department of Mechanical and Industrial Engineering, Faculty of Engineering and Computer Science, Concordia University, Montreal, Canada. He obtained his B.Eng. (Mechanical Engineering) from University of Mysore, India, in 1966. He obtained his M.Tech. (Mechanical Engineering) degree in 1968 and Ph.D. (Mechanical Engineering) in 1973, both from Indian Institute of Technolo-gy, Madras, India. His research interests are in dynamics of mechanical systems, random vibrations, rotor dynamics, structural acous-tics, and micromechatronics. He is a Fellow of Canadian Society for Mechanical Engineering, American Society of Mechanical Engineers and the Institution of Engineers (India).

References

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Published

2002-12-01

How to Cite

Khalil, M. K. B., Yurkevich, V. D., Svoboda, J., & Bhat, R. B. (2002). IMPLEMENTATION OF SINGLE FEEDBACK CONTROL LOOP FOR CONSTANT POWER REGULATED SWASH PLATE AXIAL PISTON PUMPS. International Journal of Fluid Power, 3(3), 27–36. Retrieved from https://journals.riverpublishers.com/index.php/IJFP/article/view/619

Issue

2002: Vol 03 Iss 3

Section

Original Article