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摘 要
中央空调控制是通过对整个空调系统新风、回风的温度、湿度、送风风机运行状态等现场信号的采集，控制送风风机的变频调速、加湿器的加湿、新回风阀门开度、冷热水阀的开度大小等来达到设定的空气状态，即使空气状态发生人为的变化。
本设计说明书根据恒温恒湿中央空调控制的系统原理，在查阅了大量的文献和科研论文的基础上，将常规PID控制应用在中央空调控制系统中,并利用PLC的优越性能,实现了对中央空调系统的温度和湿度的控制。
关键词：常规PID控制 中央空调控制 PLC
ABSTRACT
Central-conditioning’s controlling manages the air status adaptively and automatically according to operator’s command , adjusts the speed of a fan in terms of frequency and humidifying of humidifier, and manipulates the valve of cold and hot water. To fulfill such tasks, it must be able to detect the whole field signals in terms of temperatures and humilities of incoming wind and outgoing wind, fan’s status and so on.
This thesis bases on central-conditioning system working principle of constant temperature and constant humility .After referred to a great of literatures and scientific research thesises,we put the usual PID into the central-conditioning systems and use the predominant capability of PLC siglechip.At last ,we accomplish to the constant temperature and humility controling of the central-conditioning systems .
Key Words usual PID control， central-conditioning control , PLC
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