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Technical Briefs

Modeling and Control of a Novel High-Pressure Pneumatic Servo Valve Direct-Driven by Voice Coil Motor

[+] Author and Article Information
Li Baoren

e-mail: lbr@mail.hust.edu.cn

Gao Longlong

e-mail: festogl@hust.edu.cn

Yang Gang

e-mail: ygxing_73@mail.hust.edu.cn

FESTO Pneumatic Technology Centre,
Huazhong University of Science and Technology,
Wuhan 430074, China

1Corresponding author.

Contributed by the Dynamic Systems Division of ASME for publication in the Journal of Dynamic Systems, Measurement, and Control. Manuscript received October 12, 2011; final manuscript received August 1, 2012; published online November 7, 2012. Assoc. Editor: Nariman Sepehri.

J. Dyn. Sys., Meas., Control 135(1), 014507 (Nov 07, 2012) (5 pages) Paper No: DS-11-1311; doi: 10.1115/1.4007702 History: Received October 12, 2011; Revised August 01, 2012

High-pressure pneumatic control valves have been widely investigated during last decades. The published literature includes experimental and analytical studies on both constant value on–off valve and pressure reducing valve, but rarely on servo valve. In this paper, a novel voice coil motor (VCM) direct drive high-pressure pneumatic servo valve (HPPSV) is proposed. The mathematical model of the HPPSV including electromechanical and fluid subsystem is presented. Furthermore, the hybrid control scheme consisting of a proportional integral differential (PID) controller with velocity/acceleration feed-forward and a disturbance observer is proposed to improve the control performance of the HPPSV, taking into account the factors such as compressibility of high-pressure gas, high nonlinearity of gas flow force and friction force. The experimental results show that the spool position control system based on the proposed control scheme has strong robustness and disturbance rejection capability, and the control accuracy of the valve spool position can be enhanced greatly compared with the conventional PID controller. The study has general implications in the development of high-pressure pneumatic servo valves and high-pressure pneumatic precision control field.

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Figures

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Fig. 1

Schematic diagram of the VCM direct drive high-pressure pneumatic servo valve

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Fig. 2

Equivalent electrical circuit of the VCM

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Fig. 3

Schematic diagram of the proposed control structure

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Fig. 4

Schematic of the disturbance observer

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Fig. 5

Block diagram of the VCM direct drive HPPSV spool position control system

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Fig. 6

Schematic of the experiment setup

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Fig. 7

Experiment results for the 1 Hz square wave tracking based on PID controller

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Fig. 8

Experiment results for the 1 Hz square wave tracking based on the proposed control scheme

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Fig. 9

Experiment results for the 10 Hz sine wave tracking based on PID controller

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Fig. 10

Experiment results for the 10 Hz sine wave tracking based on the proposed control scheme

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