Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Multi-function Control of Hydraulic Variable Displacement Pump with EPPR Valve

전자비례감압밸브를 이용한 가변용량형 유압펌프의 다기능 제어

  • Jung, Dong-Soo (Hydraulic & Pneumatic Research Team, KIMM) ;
  • Kim, Hyong-Eui (Hydraulic & Pneumatic Research Team, KIMM) ;
  • Kang, E-Sok (Department of Mechanical Design Engineering, Chungnam National University)
  • Published : 2006.11.01
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Abstract

If hydraulic pump controlled by mechanical type regulator has more than one control function, the construction of regulator will be very complicated and control performance falls drastically. It is difficult to have more than one control function for hydraulic pump controlled by electronic type hydraulic valve due to the inconsistency of controllers. This paper proposes a multi-function control technique which controls continuously flow, pressure and power by using EPPR(Electronic Proportional Pressure Reducing) valve in swash plate type axial piston pump. Nonlinear mathematical model is developed from the continuity equation for the pressurized control volume and the torque balance for the swash plate motion. To simplify the model we make the linear state equation by differentiating the nonlinear model. A reaction spring is installed in servo cylinder to secure the stability of the control system. We analyze the stability and disturbance by using the state variable model. Finally, we review the control performances of flow, pressure and power by tests using PID controller.

Keywords

References

  1. N. D. Manring, 'Valve Plate Design for an Axial Piston Pump Operating at Low Displacement,' ASME Journal of Mechanical Design, Vol.116, pp.201-205, 1994
  2. S. J. Lin, A. Akers and G. Zeiger, 'The Effect of Oil Entrapment in an Axial Piston Pump,' ASME Journal of Dynamic Systems, Measurement, and Control, Vol.107, pp.246-251, 1985 https://doi.org/10.1115/1.3140730
  3. G. J. Schoenau, R. T. Burton and G. P. Kavanagh, 'Dynamic Analysis of a Variable Displacement Pump,' ASME Journal of Dynamic Systems, Measurement, and Control, Vol.112, pp.122-132, 1990 https://doi.org/10.1115/1.2894129
  4. G. Edge and N. D. Vaughan, 'Investigation of the Effects of Swashplate Angle and Suction Timing on the Noise Generation Potential of an Axial Piston Pump,' Fluid Power Systems and Technology, Vol.5, pp.77-81, 1988
  5. G. Zeiger and A. Akers, 'Torque on the Swashplate of an Axial Piston Pump,' ASME Journal of Dynamic Systems, Measurement, and Control, Vol.107, pp.220-226, 1985 https://doi.org/10.1115/1.3140724
  6. A. Akers and S. J. Lin, 'Optimal Control Theory Applied to a Pump with Single-Stage Electrohydraulic Servovalve,' ASME Journal of Dynamic Systems, Measurement, and Control, Vol.110, pp.120-125, 1988 https://doi.org/10.1115/1.3152661
  7. A. Yamaguchi and T. Ishikawa, 'Characteristics of Displacement Control Mechanisms in Axial Piston Pumps,' Bulletin of the JSME, Vol.22, No.165, pp.356-361, 1979 https://doi.org/10.1299/jsme1958.22.356
  8. H. Du and N. D. Manring, 'A Single Actuator Control Design for Hydraulic Variable Displacement Pumps,' Proceedings of American Control Conference, pp.4484-4489, 2001
  9. S. N. Yun, B. S. Kang, B. J. Sung and H. E. Kim, 'A Study on Characteristics of Nozzle/ Flapper Type Flow Control Servo Valve,' Transactions of KSAE, Vol.8, No.1, pp.54-62, 2000
  10. A. G. Alleyne and R. Liu, 'Schematic Control of a Class of Nonlinear Systems with Application to Electrohydraulic Cylinder Pressure Control,' IEEE Transactions on Control System Technology, Vol.8, No.4, pp.623-634, 2000 https://doi.org/10.1109/87.852908
  11. X. Zhang, J. Cho , S. S. Nair and N. D. Manring, 'New Swash Plate Damping Model for Hydraulic Axial-Piston Pump,' ASME Journal of Dynamic Systems, Measurement, and Control, Vol.123, pp.463-470, 2001 https://doi.org/10.1115/1.1386789
  12. N. D. Manring and F. A. Damtew, 'The Control Torque on the Swash Plate of an Axial Piston Pump Utilizing Piston-Bore Springs,' ASME Journal of Dynamic Systems, Measurement, and Control, Vol.123, pp.471-478, 2001 https://doi.org/10.1115/1.1386654
  13. O. Gad, M. G. Rabie and R. M. EI-Taher, 'Prediction and Improvement of Steady-State Performance of a Power Controlled Axial Piston Pump,' ASME Journal of Dynamic Systems, Measurement, and Control, Vol.124, pp.443-451, 2002 https://doi.org/10.1115/1.1485096