【作者】 肖世海；

【导师】 陈章位；

【作者基本信息】 浙江大学 ， 机械电子工程， 2007， 硕士

【摘要】 高端湿热环境试验箱的温湿度控制器有着如下特点：①、人机接口模块大多采用彩色液晶屏和触摸屏；②、控制器存储容量大，可存储大量温湿度数据；③、温湿度数据测量精度高；④、温湿度控制精度高，具有自调整能力，可根据试验条件的变化调节控制器内部参数。⑤、辅助功能多，如RS232串口通讯、USB通讯、以太网通讯等，方便和PC机的连接。此种类型的温湿度控制器国内生产较少。本文在综述国内温湿度控制技术的基础上，提出了基于ARM9芯片的高性能温湿度控制的设计方法。本文主要针对以下几个方面进行了研究：研究试验箱内热力学过程并建立温湿度控制系统的简化数学模型；分析温湿度控制箱的控制方法，选择合理的温湿度测量方案，提出了减少误差的方法；分析温湿度控制器的功能需求，完成了基于ARM的温湿度控制器的硬件设计和调试；选择了温湿度控制系统的控制算法，并在设计的硬件平台上实现；最后对控制效果进行了试验分析。本论文各章节主要内容概述如下：第1章综述了湿热环境试验设备技术和嵌入式系统技术进展，提出了课题的研究内容、难点和创新点。第2章分析了湿热环境试验箱温湿度控制的控制算法，分析了被控空气的热力学过程，得出简化数学模型。第3章对温度、湿度测量系统及其误差消除方法进行分析，提出基于AD7711的高精度温湿度测量方案。第4章分析温湿度控制器的需求，完成温湿度控制器硬件平台的设计。第5章研究温湿度控制系统的控制算法，在硬件平台上实现PID继电自整定算法。第6章对温湿度控制的实际控制效果进行试验分析。第7章总结与展望。更多还原

【Abstract】 There are some points about high-class temperature and humidity controllers for damp heat test chambers, which are:①use color LCD and touch screen as Human-Machine Interface;②have large memory, which could shortage a lot of programs for temperature and humidity;③high precision of temperature and humidity measuring;④high precision and low fluctuate of temperature and humidity control, and have the ability of self-tuning which could adjust control parameter by itself when the test condition changes;⑤have much supplementary function, such as RS232, USB, Ethernet and so on. Temperature and humidity controllers in the similar grade or above are seldom produced all in our country.This study designs an ARM9 based high performance temperature and humidity controller, due to the normally low performance produced in our country. This study primarily appoints to several aspects below. First it studies the control methods for damp heat test chambers, and then analyzes thermodynamical processes of the air in the chamber and its mathematical model. Second, it analyzes the error of temperature and humidity detecting and the method to reduce error, and then gives a plan of high precision temperature and humidity measuring. Afterwards, analyzes the needs of the controller, and complete the hardware design. Last, chooses the suitable control algorithm, and implement it on the hardware platformThe main content of each chapter is given below.Chapter 1 introduces some back acknowledge of ARM, equipments for environmental test and something else like that. And it gives the primary of this study, includes mainly point, difficult points and the new.Chapter 2 studies the control methods for damp heat test chambers, and then analyzes thermodynamical processes of the air in the chamber and its mathematical model.Chapter 3 analyzes the error of temperature and humidity detecting and the method to reduce error, and then gives a plan of AD7711 based high precision temperature and humidity measuring.Chapter 4 analyzes the needs of the controller, and completes the hardware design.Chapter 5 chooses the suitable control algorithm, and implements it on the hardware platform.Chapter 6 analyzes the performance of the controller through experiment.Chapter 7 summarizes briefly.更多还原