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Research Papers

Performance of Proportional Flow Valve With Pilot Pressure Drop—Spool Opening Compensation

[+] Author and Article Information
Jiahai Huang, Jiangjiao Dai, Yuan Lan

Key Laboratory of Advance Transducers
and Intelligent Control System,
Ministry of Education,
Taiyuan University of Technology,
Taiyuan 030024, China

Long Quan

Key Laboratory of Advance Transducers
and Intelligent Control System,
Ministry of Education,
Taiyuan University of Technology,
Taiyuan 030024, China
e-mail: quanlong@tyut.edu.cn

1Corresponding author.

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received November 9, 2015; final manuscript received August 12, 2016; published online October 17, 2016. Assoc. Editor: Heikki Handroos.

J. Dyn. Sys., Meas., Control 139(1), 011009 (Oct 17, 2016) (8 pages) Paper No: DS-15-1564; doi: 10.1115/1.4034504 History: Received November 09, 2015; Revised August 12, 2016

Flow control valves are extensively used to control the motion of hydraulic actuators in industry. In this paper, a two-stage proportional flow control valve with pilot digital pressure compensator is presented. The proposed valve is composed of two pressure sensors, a proportional pilot valve, a Valvistor poppet valve (main stage), and an electronic controller. The pressure drop across the pilot valve metering orifice is detected by two pressure sensors and fed into the controller which changes the pilot valve input voltage to compensate pressure influence on the outlet flow. The presented valve is investigated theoretically by simplified analytical models as well as numerical methods and also evaluated experimentally. The results show that the proposed scheme is feasible. It has a reasonable static performance and an acceptable dynamic characteristic for low bandwidth disturbances. The flow force on the Valvistor poppet should be estimated and considered in the controller design.

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References

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Figures

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Fig. 1

Configuration of the proposed flow control valve

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Fig. 2

Validation of the pilot valve simulation model: (a) dynamic performance and (b) static performance

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Fig. 3

Photo of the proportional flow valve test rig: (1) pilot valve, (2) gear flow meter (0–15 L/min), (3) displacement sensor 4, pressure sensor, (5), and Valvistor valve

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Fig. 4

Calibration of LVDT

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Fig. 5

Relationship among the pi, po, and pc

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Fig. 6

Step response of the main stage displacement

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Fig. 7

Steady performance of main stage displacement

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Fig. 8

Dynamic response of proposed valve with compensation

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Fig. 9

Comparison of the numerical results and tested results under steady condition: (a) Qt versus Δpm and (b) xm versus Δpm

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Fig. 10

Steady control performance (simulation model): (a) xm versus Ui and (b) Qt versus Ui

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Fig. 11

Steady load characteristics (simulation model): (a) performance with pilot compensation scheme and (b) performance without pilot compensation scheme

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Fig. 12

Dynamic response of the step input signal at constant pi and △pm

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Fig. 13

Simulation result of dynamic performance

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Fig. 14

Simulation result of frequency response

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