Position control of a pneumatic cylinder using fuzzy PWM control method

Shih, Ming‐Chang; Ming-An, MA

doi:10.1016/s0957-4158(98)00005-1

Cited by 74 publications

(43 citation statements)

References 1 publication

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“…In this case, precise control is difficult due to the discrete-input nature of the system. Past research has developed solenoid-valve pneumatic systems, which utilize a pulse width modulated (PWM) controller [13], [14], [15], [16]. Using time averaging, a PWM input with a sufficiently high frequency can approximate the continuous input properties of a servovalve [11].…”

Section: Introductionmentioning

confidence: 99%

Improved tracking and switching performance of an electro-pneumatic positioning system

Hodgson

Tavakoli

et al. 2012

Mechatronics

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For robotic systems that use on/off (solenoid) pneumatic actuators, a sliding mode control law for precise position control and low switching (open-close) activity of the valves is presented in this paper. Given a pneumatic actuator with two chambers and four solenoid valves, there are sixteen possible input combinations defined directly from the state of the four on/off valves present in the system; however, only seven of these discrete operating modes are considered both functional and unique. Therefore, we introduce a novel seven-mode sliding controller that minimizes the position tracking error using modes that have both the necessary and sufficient amounts of drive energy and, thus, involve reduced switching activity. An analysis of the closed-loop system stability is carried out. The performance of the proposed control design is experimentally verified on a single pneumatic actuator setup comprising of two chambers with four on/off valves.

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Section: Introductionmentioning

confidence: 99%

Improved tracking and switching performance of an electro-pneumatic positioning system

Hodgson

Tavakoli

et al. 2012

Mechatronics

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“…The cylinder provides force of 931 N to support the weight of the moved mass. The inner and rod diameter of the cylinder were 0.08 m and 0.03 m, respectively, while the tank volume was 0.08 m 3 . The weight of the moved mass driven by linear motor was 95 kg and the stroke was 0.2 m. The different velocity limits are set for the linear motor to clarify the system performance.…”

Section: Resultsmentioning

confidence: 99%

“…Shih and Hwang (2) developed modified differential pulse width modulation (PWM) method to eliminate the dead zone and to improve the nonlinear characteristics between the pressure differences of the cylinder. In Shih and Ma (3) , the fuzzy PWM control method was developed and applied to control the position of a pneumatic cylinder with high speed solenoid valves. Also, Sorli and Pastorelli (4) developed PNM/PWM controller to control chamber pressure of cylinder by two pairs of monostable 2-way valves.…”

Section: Introductionmentioning

confidence: 99%

A Study of the Pneumatic Counterweight of Machine Tools Conventional and Active Pressure Control Method

Tsai

Shih

2006

JSME Int. J., Ser. C

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The pneumatic counterweight method is a suitable counterweight method used for machine tool owing to its high speed and force capacity, combined with low price and clean operation. However, the preset pressure cannot be hold at higher traveling rate if the conventional pneumatic counterweight is applied. In this study, rather than using the conventional pressure compensation method, the active pressure control method was designed as an alternative to the pneumatic counterweight driven by a linear motor. The fuzzy sliding mode controller was designed and implemented for regulating the pressure using the servo valve. The experimental results demonstrate that the variation of the pressure in the pneumatic cylinder can be hold within the range ±15 kPa by using active pressure control method.

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“…The fuzzy control is utilized to compensate the displacement error of the double hydraulic cylinders and as the core of the synchronous control, the fuzzy control is composed of fuzzier, fuzzy inference engine and defuzzier [18]. The structure of the fuzzy controller determines the control performance and the complexity of the system and MISO type fuzzy control; the error between the double cylinders and the derivation of error being the input of the fuzzy controller and the duty ratio of the pulse signal being the output of the fuzzy controller are designed ( Figure 10).…”

Section: Fuzzy Controlmentioning

confidence: 99%

Collaborative Synchronization Digital Control for Double Hydraulic Cylinders

Liu

Gao

Chen

et al. 2014

Advances in Mechanical Engineering

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By researching the synchronization motion of double hydraulic cylinders controlled by high-speed on-off valve, the paper aims to solve the shortage of current hydraulic synchronization system with low synchronization precision. The flow characteristic of high-speed on-off valve with pulse width-frequency modulation is researched compared with pulse width modulation. The mathematical equations of the double hydraulic cylinders are formulated with bulk-cavity-node method in MATLAB/Simulink. The collaborative synchronization control is analyzed and the compound algorithm of collaborative synchronization control and pulse width-frequency modulation is simulated compared with collaborative synchronization control. The hydraulic loop is set up to verify the simulation result with the proposed control algorithm on the FESTO platform. The research finds that (1) the pulse width-frequency modulation control can be linear to the flow of high-speed on-off valve on the duty bound of 0∼100%; (2) the collaborative synchronization control is effective to eliminate the displacement error between the double cylinders which results from the different load environment and other disturbance.

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Position control of a pneumatic cylinder using fuzzy PWM control method

Cited by 74 publications

References 1 publication

Improved tracking and switching performance of an electro-pneumatic positioning system

Improved tracking and switching performance of an electro-pneumatic positioning system

A Study of the Pneumatic Counterweight of Machine Tools Conventional and Active Pressure Control Method

Collaborative Synchronization Digital Control for Double Hydraulic Cylinders

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