本文叙述了用微机对湿热试验箱进行恒定温度湿度控制的系统,提出了以自适应比例调节作为温控基础,以脉冲调宽方式控制调节箱内湿度,使箱体能比较理想地实现了温湿闭度环控制.试验结果表明:系统在温度20℃～80℃时,温控偏差小于2℃;湿度在50%～98%时,湿控偏差小于3%. This paper describes a system for controlling the temperature and humidity of a humid chamber by a microcomputer. It proposes that the adaptive proportional control be used as the basis of temperature control, and the pulse width modulation method should be used to control the humidity in the control chamber so that the cabinet can achieve the ideal temperature Humidity closed loop control.The experimental results show that when the system temperature is from 20 ℃ to 80 ℃, the deviation of temperature control is less than 2 ℃; when the humidity is from 50% to 98%, the humidity control deviation is less than 3%.