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林业科学 ›› 2018, Vol. 54 ›› Issue (11): 79-86.doi: 10.11707/j.1001-7488.20181112

• 论文与研究报告 • 上一篇    下一篇

气候室智能前馈PID高精度控制方法

郑焕祺1, 朱科2, 杜光月1, 周玉成1   

  1. 1. 山东建筑大学信息与电气工程学院 济南 250101;
    2. 山东建筑大学热能工程学院 济南 250101
  • 收稿日期:2018-04-02 修回日期:2018-06-29 出版日期:2018-11-25 发布日期:2018-12-04
  • 基金资助:
    泰山学者优势特色学科人才团队(2015162)。

High Precision Control Method of Intelligent Feedforward PID for Climate Chamber

Zheng Huanqi1, Zhu Ke2, Du Guangyue1, Zhou Yucheng1   

  1. 1. School of Information and Electrical Engineering, Shandong Jianzhu University Jinan 250101;
    2. School of Thermal Engineering, Shandong Jianzhu University Jinan 250101
  • Received:2018-04-02 Revised:2018-06-29 Online:2018-11-25 Published:2018-12-04

摘要: [目的]提出一种智能前馈PID高精度控制方法,解决30 m3气候室控制系统由于加水而出现振荡、使得控制精度达不到标准要求的问题以及系统稳定性和稳态响应较差的现象。[方法]当露点水箱需要补水时,在分析露点水箱温度的基础上,设计前馈PID控制系统和执行机构。待补水水温达到露点水箱温度时,系统自动进行补水,使得经过补水的露点水箱温度扰动最小化,形成全局双闭环控制系统结构,实现动态高精度控制。[结果]1)30 m3气候室的温度和相对湿度控制精度分别在±0.1℃和±1.5%内;2)设定温度23.0℃,相对湿度45.0%,在3~28天内持续运行条件下,非大惯性扰动下的偏差不超过±0.1℃和±2%,且每次自动补水后温湿度振荡时间小于1 h;3)冬季条件下设定温度23.0℃和相对湿度45.0%时,达到设定参数值的过渡过程不超过4 h。[结论]利用智能前馈PID控制方法,能有效解决30 m3气候室控制系统稳定性和稳态响应较差的现象,控制系统精度和控制过程品质可达到现行国际标准要求。

关键词: 甲醛及VOCs检测, 气候室, 前馈控制

Abstract: [Objective] In this paper a feed forward PID high precision control method is proposed to solve the problem of temperature and humidity oscillation caused by dew point water tank replenishment in the process,which is used to detect formaldehyde and volatile organic compounds(VOCs) released from the furniture in 30 m3 climate chamber.[Method] The feed-forward PID control system and actuator are designed based on the analysis of dew point tank temperature. When dew point tank needs water supply, the system will automatically refill water to the dew point tank, until the dew point tank temperature is reached, minimizing the temperature disturbance of the dew point tank. In this way, the structure of limited open loop and global double closed loop control system is formed, and dynamic and high-precision control can be realized.[Result] The result of this study show that:1) The temperature and dew point temperature control accuracy of 30 m3 climate chamber are within ±0.1℃ and ±1.5% respectively; 2) When the temperature is set at 23.0℃ and the relative humidity is 45.0%, under continuous operating conditions for 3 to 28 days, the deviation under non-large inertia disturbance does not exceed ±0.1℃ and ±2%, and the temperature and humidity oscillation time after each replenishment is less than 1 h; 3) Under winter conditions with a constant temperature of 23.0℃ and a relative humidity of 45.0%, the transition period does not exceed 4 h.[Conclusion] The control method of intelligent feedforward PID can effectively solve the problems of instability and the poor steady state response of the 30 m3 chamber control system. The accuracy and quality of the control system have reached the advanced level in world.

Key words: formaldehyde and VOC detection, chamber, feedforward control

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