Abstract
In this article, to increase the tracking ability of pulse width modulation (PWM)-driven pneumatic servo systems, the pneumatic circuit is modified such that an identical PWM signal is demanded by both fast switching valves. As a result, the problem of allocating different duty cycles to the valves is vanished, due to the synchronized pulsing inputs. A simple PWM algorithm is applied to compensate the dead zones in the relation between the duty cycle input and the valve flow output. An experimental investigation is carried out to indicate the capabilities of the proposed circuit. Closed-loop tests are implemented and high tracking performance for frequencies up to 5Hz are obtained, whereas experiments with frequencies up to 1Hz were reported in previous studies. In similar conditions of load and cylinder size, experiments of the proposed circuit indicate acceptable results with simple PD controller, compared with the more complicated controllers and circuits of previous studies.
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References
Goldstein SR, Richardson H (1968) A differential pulse-width modulated pneumatic servo utilizing floating flapper disc switching valves. Trans ASME J Basic Eng C 90: 143–151
Noritsugu T (1987) Development of PWM mode electro-pneumatic servomechanism, Part I: Speed control of a pneumatic system. J Fluid Control 17(1): 65–79
Noritsugu T (1987) Development of PWM mode electro-pneumatic servomechanism, Part II: Position control of a pneumatic system. J Fluid Control 17(2): 7–28
Kunt C, Singh R (1990) A linear time varying model for on-off valve controlled pneumatic actuators. Trans ASME J Dyn Syst Meas Control 112: 740–747
Ye N, Scavarda S, Betemps M, Jutard A (1992) Models of a pneumatic PWM solenoid valve for engineering applications. Trans ASME J Dyn Syst Meas Control 114: 680–688
Van Varseveld RB, Bone GM (1997) Accurate position control of a pneumatic actuator using on/off solenoid valves. IEEE/ASME Trans Mechatron 2: 195–204
Shih MC, Hwang C (1997) Fuzzy PWM control of the positions of a pneumatic robot cylinder using high speed solenoid valve. JSME Int J 40(C): 469–476
Shih MC, Ma M (1998) Position control of a pneumatic rodless cylinder using fuzzy PWM control method. Mechatronics 41: 241–253
Shih MC, Ma M (1998) Position control of a pneumatic rodless cylinder using sliding mode M-D-PWM control the high speed solenoid. JSME Int J 41(2C): 236–241
Gentile N, Giannoccaro NI, Reina G (2002) Experimental tests on position control of a pneumatic actuator using on/off solenoid valves. In: Proceedings of IEEE ICIT conference on industrial technology, Bangkok, Thailand, pp 555–559
Barth EJ, Zhang J, Goldfarb M (2003) Control design for relative stability in a PWM-controlled pneumatic system. Trans ASME J Dyn Syst Meas Control 125: 504–508
Shen X, Zhang J, Barth EJ, Goldfarb M (2004) Nonlinear averaging applied to the control of pulse width modulated (PWM) pneumatic systems. In: Proceedings of the American control conference, Boston, USA, pp 4444–4448
Shen X, Zhang J, Barth EJ, Goldfarb M (2006) Nonlinear model-based control of pulse width modulated pneumatic servo systems. Trans ASME J Dyn Syst Meas Control 128: 663–669
Messina A, Giannoccaro NI, Gentile A (2005) Experimenting and modeling the dynamics of pneumatic actuators controlled by pulse width modulated (PWM) technique. Mechatronics 15: 859–881
Noritsugu T (1987) Pulse-width modulated feedback force control of a pneumatically powered robot hand. In: Proceedings of the international symposium on fluid power control and measurement, Tokyo, Japan, pp 47–52
Belforte G, Mauro S, Mattiazzo G (2004) A method for increasing the dynamic performance of pneumatic servosystems with digital valves. Mechatronics 14: 1105–1120
Sorli M, Pastorelli S (2000) Performance of a pneumatic force controlling servosystem: influence of valves conductance. Robotics Auton Syst 30: 283–300
Granosik G, Borenstein J (2004) Minimizing air consumption of pneumatic actuators in mobile robots. In: Proceedings of IEEE international conference on robotics and automation, New Orleans, LA, pp 3634–3639
Scarfe P, Lindsay E (2006) Air muscle actuated low cost humanoid hand. Int J Adv Robotic Syst 3: 139–146
Nguyen T, Leavitt J, Jabbari F, Bobrow JE (2007) Accurate sliding-mode control of pneumatic systems using low-cost solenoid valves. IEEE/ASME Trans Mechatron 12: 216–219
Taghizadeh M, Ghaffari A, Najafi F (2008) A linearization approach in control of PWM-driven servo-pneumatic systems. In: Proceeding of the 40th IEEE/SSST South-eastern symposium on system theory, New Orleans, LA, USA, pp 395–399
Chillari S, Guccione S, Muscato G (2001) An experimental comparison between several pneumatic position control methods. In: Proceedings of the 40th IEEE conference on decision and control, USA, pp 1168–1173
Topcu EE, Yuksel I, Kamis Z (2006) Development of electro- pneumatic fast switching valve and investigation of its characteristics. Mechatronics 16: 365–378
Ahn K, Yokota S (2005) Intelligent switching control of pneumatic actuaror using on/off solenoid valves. Mechatronics 15: 683–702
Richer E, Hurmuzlu Y (2000) A high performance pneumatic force actuator system: part II—nonlinear control design. Trans ASME J Dyn Syst Meas Control 122: 425–434
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Taghizadeh, M., Najafi, F. & Ghaffari, A. Increased tracking ability of pulse width modulation-driven pneumatic servo systems via a modified pneumatic circuit. Electr Eng 91, 79–87 (2009). https://doi.org/10.1007/s00202-009-0119-9
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DOI: https://doi.org/10.1007/s00202-009-0119-9