The formaldehyde released from artificial boards and their products can seriously harm human health.A ventilated constant temperature and humidity climate chamber is one of the main equipment for detecting formaldehyde emissions using the climate chamber method.The traditional fixed parameter PID controller based on PLC cannot effectively cope with the impact of external environmental disturbances on the temperature and humidity inside the cabin.Therefore,a ventilation based climate chamber temperature and humidity automatic control system with variable parameters is designed based on PLC to ensure the stable operation of the climate chamber.Experiments show that the designed control system,through the optimization of the controller parameter settings,the operating accuracy of temperature and relative humidity is controlled at±0.1℃ and±0.5%,which can quickly reach the set target and achieve stable operation.
关键词
气候舱/恒温恒湿/可编程逻辑控制器/PID变参数控制
Key words
climate chamber/constant temperature and humidity/PLC/PID variable parameter control
维普
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