低氧热环境模拟控制系统设计与实现

Design and Realization of the Inert Atmosphere Heat Environment Control System

摘要:

介绍了低氧热环境地面模拟控制系统的组成与结构,对环境舱压力、环境舱温度、环境舱氧浓度闭环控制。基于西门子公司PLC硬件平台开发了分布式控制器,采用WINCC7.0组态软件开发了人机交互界面。控制器采用主从站架构完成对低温液氮系统、压力调节系统、温度调节系统的控制,上位机计算机与控制器之间采用以太网通讯。在软件方面,根据低氧环境试验的需求和试验流程,设计并实现了PID闭环控制、数据存储、以及人机交互界面等功能。并对该实时控制系统进行了验收,验收结果分析表明,该分布式控制系统具有控制精度高、可靠性好、开发周期短,能够完成多种环境参数的控制任务,并为产品集成设计提供一些经验借鉴。

Abstract:

Introduce the composing and structure of inert atmosphere heat control system, pressure control, temperature control, oxygen strength control. The distributed controller base on PLC of SIEMENS, and empolder the software based on WINCC7.0. The principal and subordinate station controller complete LN2 control, pressure control and temperature control. Ethernet communication is used between upper computer and controller. The software contains PID close-loop control, data storage, human-computer interaction interface. The control system has been checked and accepted. The result indicate that the control system is high-control-precision and high-reliability, and can be used in multi-environmental factors test .