A Method for Improving Position Control Performances of a Pneumatic Cylinder Using On-Off Solenoid Valves
Main Article Content
Abstract
Technology using on-off solenoid valves is currently being applied in controlling pneumatic actuators to replace the use of the pneumatic proportional/servo valves. However, controlling the pneumatic actuators using on-off solenoid valves is often difficult due to the low switching frequency of these valves and the high nonlinearity of the pneumatic system. In this paper, we first re-evaluate a controller proposed by Truong in 2020 [B. V. Truong, Study on accurate control of pneumatic cylinder using on-off solenoid valves, Bachelor thesis, Fluid Power and Automation Eng. Dept., School of Transportation Eng., Hanoi University of Science and Technology, Hanoi, Vietnam, 2020], in which four pneumatic on-off valves were used. We then modify the Truong's controller by dividing the desired position input of the cylinder into two controlled position intervals and each interval will use a separate control law. Seven operating modes of the four on-off solenoid valves combined with the Pulse Width Modulation method (PWM) are used. The experimental research method is carried out. The modified controller is evaluated by comparing it with the Truong’s controller and a controller for a pneumatic system using pneumatic proportional valves at the same conditions of the desired position inputs. Comparison results verify the usefulness of the modified controller.
Keywords
position control, pneumatic cylinder, on-off solenoid valve, pulse width modulation
Article Details
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K. Kawashima, Evaluation of a pneumatic surgical
robot with dynamic force feedback, J Robotic Surg.,
Vol. 13, no. 3, pp. 413-421, Jun. 2019.
https://doi.org/ 10.1007/s11701-018-0878-2
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Model-based tracking control design, implementation
of embedded digital controller and testing of a
biomechatronic device for robotic rehabilitation,
Mechatronics, Vol. 52, pp. 70–77, Jun. 2018.
https://doi.org/10.1016/j.mechatronics.2018.04.006.
[4] J. E. Bobrow and F. Jabbari. Adaptive pneumatic force
actuation and position control, ASME J Dynam Syst
Meas Control, Vol. 113, No. 2, pp. 1508 – 1513, Jan.
1991.
https://doi.org:10.1115/1.2896374.
[5] X. Gao and Z. J. Feng, Design study of an adaptive
fuzzy-PD controller for pneumatic servo system.
Control Engineering Practice, Vol. 13, No. 1, pp. 55-65,
Jan. 2005.
https://doi.org/10.1016/j.conengprac.2004.01.001.
[6] Y. Chen, G. Tao, and H. Liu, High precision adaptive
robust neural network control of a servo pneumatic
system, Appl. Sci., Vol. 9, No. 17, pp. 1-17, Aug. 2019.
https://doi.org/10.3390/app9173472.
[7] D. Saravanakumar, B. Mohan, and T.
Muthuramalingam, A review on recent research trends
in servo pneumatic positioning systems, Precision
Engineering, Vol. 49, Jul. 2017, pp. 481-492,
https://doi.org/10.1016/j.precisioneng.2017.01.014.
[8] B. Van Varseveld and G. M. Bone, Accurate position
control of a pneumatic actuator using on/off solenoid
valves, IEEE/ASME Transactions on Mechatronics,
vol. 2, no. 3, pp. 195-204, Sept. 1997
https://doi.org/ 10.1109/3516.622972.
[9] K. Ahn and S. Yokota, Intelligent switching control of
pneumatic actuator using on/off solenoid valves,
Mechatronics, vol. 15, no. 6, pp. 683–702, Jul. 2005,
https://doi.org/10.1016/J.Mechatronics.2005.01.001.
[10] X. Shen, J. Zhang, E. J. Barth and M. Goldfarb,
Nonlinear model-based control of pulse width
modulated pneumatic servo systems, Journal of
Dynamic Systems, Measurement, and Control, vol. 128,
no. 3, pp. 663-669, Sep. 2006
https://doi.org/ 10.1115/1.2232689.
[11] B. V. Truong, Study on accurate control of pneumatic
cylinder using on-off solenoid valves, Bachelor thesis,
Fluid Power and Automation Eng. Dept., School of
Transportation Eng., Hanoi University of Science and
Technology, Hanoi, Vietnam, 2020.
[12] X. B. Tran, V. L. Nguyen, N. C. Nguyen, D. T. Pham
and V. L. Phan, Sliding mode control for a pneumatic
servo system with friction compensation. In: Sattler
KU., Nguyen D., Vu N., Tien Long B., Puta H. (eds)
Advances in Engineering Research and Application.
ICERA 2019. Lecture Notes in Networks and Systems,
vol 104. Springer, Cham
https://doi.org/ 10.1007/978-3-030-37497-6_75.