人工气候室控制系统设计

Design of Control System for Artificial Climate Chamber 

摘要:

设计开发了一种基于PLC和触摸屏的人工气候室系统,用来模拟温度、湿度、CO₂浓度,光照强度等自然条件;详细描述了系统的硬件组成及软件设计,实现了短信报警、网络监控等扩展功能;设计了一套逻辑控制算法,解决了人工气候室惯性、大滞后等问题,实现了对气象因子的精确控制;经过实地测试表明,温度控制精度为±0.5 ℃,湿度控制精度为±5%rh,CO₂浓度控制精度为±30 ppm,均达到了控制要求。

Abstract:

An artificial climate chamber based on PLC and HMI was designed to simulate nature weather such as temperature, humidity, carbon dioxide concentration and illumination intensity .The hardware composition and the software design was described in details. And the extended function such as message alarm and network monitoring was realized. A kind of logical control algorithm was designed to solve the problem of inertia and large lag. The engineering practice indicates that the control precision of temperature is ±0.5°C, the precision of humidity achieves ±5%rh and the precision of carbon dioxide concentration attains ±30ppm.