阀门定位器是与气动控制阀配套使用的现场仪表。为了提高定位器的控制性能，以AVR单片机为核心，设计了基于HART通信协议的智能阀门定位器。给出了详细的原理框图和软硬件设计方案，研究了两线制总线供电、低功耗设计、阀位控制算法、HART通信接口等技术问题。该设计实现了阀门定位器的智能化、数字化和网络化，具有广阔的应用前景，对相关产品的研制有重要的指导意义。%Valve positioner is one of the field instruments supporting the use of pneumatic control valves. In order to enhance the control performance of the positioner, the intelligent valve positioner based on HART communication protocol has been designed with AVR single chip computer as the core. Detail schematic block diagram and design scheme of hardware and software are given. Several technical issues including two-wire bus power supply, low power consumption design, valve position control algorithm and HART communication interface, etc. , are researched. The design realizes intellectualization, digitization and networking of the valve positioners;it possesses broad application prospects and important guiding significance for the development of related products.
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