Dissertation > Industrial Technology > Machinery and Instrument Industry > Mechanical parts and gear > Control parts

Study of Two-wire Electropneumatic Valve Positioner’s Design Based on HART Protocol

Author ZhangYuanHua
Tutor MaoJianGuo
School Nanjing University of Aeronautics and Astronautics
Course Aerospace Propulsion Theory and Engineering
Keywords Process Control Fieldbus Smart valve positioner Low power consumption HART protocol
Type Master's thesis
Year 2006
Downloads 267
Quotes 12
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The automatic control of the production process referred to as process control , plays an extremely important role in the national economy . Process Control Distributed Control System to mixed analog-digital from analog control system development , and the further development of the fieldbus control system . The quality depends largely on the process control process control instruments , including transmitters, regulators , actuators, and a variety of assistive devices . Pneumatic control valve which is very important in the process control actuator valve positioner pneumatic control valve attachments , you can improve the valve characteristics , improve control precision , speed , and increase the flexibility of control . Valve positioner to the development of intelligent , fieldbus instrumentation direction brought profound changes to the process control , represents the development direction of the pneumatic actuator technology . At present , some foreign companies have successively successfully developed smart valve positioner , some with HART protocol , PROFIBUS bus , FF fieldbus interface bus ; domestic research in this area is still in its infancy . 4 ~ 20mA current paper developed smart valve positioner , HART protocol can be configured to interface two-wire valve positioning system , the overall design to expand around the realization of low-power , research work and results are as follows : 1 for low power made a preliminary study for the control circuits , DC-DC conversion and other technical problems , proposed solutions accordingly ; 2 . constructed ADμC 812 microcontroller as the core of the control system , including the a / D sampling , data processing , D / A unit of output , valve position driver ; prepared based the system modularization package composed of two parts, control procedures and functional modules ; preliminary exploration HART protocol communication design , design and debug HART protocol communication circuit hardware and software systems ; 5 . construct a prototype of an intelligent two-wire valve positioner .

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