温室节点式渗灌自动控制系统设计与实现
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辽宁省重大农业攻关项目(2006215005)


Design and implementation of automatic control system for sectional type subsurface drip irrigation in greenhouse
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    摘要:

    为了充分发挥节点式渗灌技术的节水增效作用,根据中国东北的农业资源特征,并考虑到农民的生产规模和经济条件,应用模糊控制方法,研制了一种适用该技术的自动控制灌溉系统。该系统由控制器、电磁阀、土壤湿度传感器、水箱和渗灌管网等构成。控制器采用89S51单片机。A/D转换芯片的型号为ADC0804。显示器采用LCM显示模块。外部存储器采用24c02芯片。键盘由4个弹跳按钮构成。输入到二维模糊控制器的信号有2个,即土壤含水率误差和经过差分变换的土壤含水率误差变化率。经过二维模糊控制器的分析和放大作用后,其输出信号也是2个,即电磁阀的开启时刻和电磁阀开启持续时间。初步试验结果表明把土壤含水率提高10%所需的调整时间在30~40 min之内、系统的控制误差在3%以内,系统运行稳定,准确性和和快速性等指标能满足农业技术要求。

    Abstract:

    In order to fully draw out the potential of water saving and benefit increasing of the subsurface drip irrigation technology in greenhouse production, the authors developed an irrigation control system with the method of fuzzy controlling. In the design process of the system, the authors considered the climate characteristic of cold and drought in the northeast of China, and the greenhouse production scale and financial situation of the local farmers specially. The developed system consists of a controller, a magnetic valve, a soil humidity transducer, a water tank and a sectional sub irrigation ductwork. An 89S51 type chip microprocessor has been used as the controller, and the type of the A/D converter is ADC0804. An LCM display module is adopted as the indicator, and a 24c02 type chip as the external memory. The keyboard of the system consists of four spring type keys. There are two input signals to the two-dimension controller which are the errors of soil moisture and the change rate of the above error. There are also two output signals from the controller which are the open time of magnetic valve and the continuous open period of the above valve. Experiment results showed that the governing time needed 30-40 min to raise soil moisture by 10%, the control error was ≤3%, and the operation of the system was steady. The accuracy and rapidity of the system were able to satisfy the agriculture technical requirements.

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任文涛,杨 懿,张本华,崔红光,黄 毅,张玉龙.温室节点式渗灌自动控制系统设计与实现[J].农业工程学报,2009,25(8):59-63.

Ren Wentao, Yang Yi, Zhang Benhua, Cui Hongguang, Huang Yi, Zhang Yulong. Design and implementation of automatic control system for sectional type subsurface drip irrigation in greenhouse[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE),2009,25(8):59-63.

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  • 收稿日期:2008-08-31
  • 最后修改日期:2009-06-16
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