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Ruan Jian
Li Sheng
Pei Xiang
Department of Mechanical Engineering,
Zhejiang University of Technology,
Hangzhou 310014, China
Burton R
Ukrainetz P
Bitner D
Department of Mechanical Engineering,
University of Saskatchewan,
57 Campus Drive, Saskatoon, Sasktachewan, Canada, S7N 5A9 |
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2D
DIGITAL SIMPLIFIED FLOW VALVE*
Abstract:
The 2D digital simplified flow valve is composed of a pilot-operated valve designed with both rotary and linear motions of a single spool, and a stepper motor under continual control. How the structural parameters affect the static and dynamic characteristics of the valve is first clarified and a criterion for stability is presented. Experiments are designed to test the performance of the valve. It is necessary to establish a balance between the static and dynamic characteristics in deciding the structural parameters. Nevertheless, it is possible to maintain the dynamic response at a fairly high level, while keeping the leakage of the pilot stage at an acceptable level. One of the features of the digital valve is stage control. In stage control the nonlinearities, such as electromagnetic saturation and hysteresis, are greatly reduced. To a large extent the dynamic response of the valve is decided by the executing cycle of the control algorithm..
Key words: Digital control Flow valve Two motion of spool Stage control |