设施农业智能化控制系统设计—西红柿生产控制.doc

设施农业智能化控制系统设计— 西红柿生产控制 设施农业智能化控制系统—西红柿生产控制 摘 要 设施农业是指通过自动化控制方式，调节温室内的温度、湿度、通风、光照等环境因子，营造出最适宜农作物生长的环境状态，以实现高产、高效为目的的现代农业生产。由于温室是一个复杂多变的非线性、大滞后的动态环境系统，很难采用传统的PID控制算法去建立数学模型，因而，本文采用了模糊控制算法对温室环境进行综合控制。本文研究的主要内容如下： （1）分析了主要环境因子对农作物生长的影响，总结出西红柿生长在不同时期所需最适宜的温度、湿度、光照度和CO2浓度等环境状态。 （2）温室系统的模糊控制策略采用查表算法，使用温度误差作为模糊控制器的输入量，天窗、遮阳网、风机和湿帘等作为系统的输出控制量，系统选用三角隶属函数，并按照模糊控制规则进行相关设计。 （3）温室结构采用了上下位机联级控制模式，上位机控制界面用VB程序编写，实现数据存储、实时数据显示、发送控制参数等功能。下位机完成温室内温度、湿度、CO2浓度和土壤水分等参数的检测和控制。 （4）完成了温室中传感器的布局和选型，及传感器输出电流电压转换接口电路的设计。研究了温室输出执行机构的操作规则与传感器输入量之间的对应关系。 通过实践表明，系统Agricultural facilities intelligent control system - tomato production control ABSTRACT Agricultural facilities is which through automated control adjust the temperature inside the greenhouse, humidity, ventilation, light and other environmental factors, to create the most suitable environmental conditions for crop growth, in order to achieve productive and efficient for the purpose of modern agricultural production. Because the greenhouse is a complex and dynamic environment system, it is difficult to set up mathematical model to control using the traditional way of PID. For the fuzzy control algorithm, equation of state objects is not required, which is also suitable for controlling the nonlinear, time-varying delay system. Therefore, fuzzy control algorithm is adopted to control greenhouse, and for example in summer Greenhouse control, by fuzzy control algorithm to achieve effective and reasonable control of the ambient temperature. (1) By analyzing the effects of major environmental factors on the growth of crops, the tomatoes grown in different periods required is summed up for the optimum temperature, humidity, light intensity and CO2 concentration and other environmental status. (2) Greenhouse makes use of look-up table algorithm in fuzzy control strategy, temperature error as the fuzzy controller input, and sunroof, shade net, fans and wet curtain, etc., as the system’s output. Greenhouse system selects triangle membership fu