排灌机械工程学报
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排灌机械工程学报  2019, Vol. 37 Issue (1): 80-85    DOI: 10.3969/j.issn.1674-8530.18.1191
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溶解混施水肥一体化装置自动控制系统研制
夏华猛,李红,陈超,张志洋
江苏大学国家水泵及系统工程技术研究中心, 江苏 镇江 212013
Development of automatic control system for integrated fertilizer dissolving and mixing device
XIA Huameng, LI Hong, CHEN Chao, ZHANG Zhiyang
National Research Center of Pupms, Jiangsu University, Zhenjiang, Jiangsu 212013, China
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摘要 为了提高溶解混施水肥一体化装置的施肥均匀性,解决水肥调控时灌溉量和质量浓度的综合控制问题,设计了溶解混施水肥一体化装置的自动控制系统.采用STM 32微控制器作为控制核心,通过肥料质量浓度标定试验,确定肥液质量浓度和电导率之间的关系,由电导电极及相关检测电路对出口肥液的质量浓度实时在线检测,将肥液质量浓度信号反馈回处理器,并生成控制信号,构建闭环控制回路;采用半桥式电路驱动直流水泵调节供水流量,采用PWM脉宽调制方法实时改变固体肥料添加速度,使出口的肥液质量浓度更加均匀、稳定.试验测定了装置施肥性能,结果表明在加入控制系统实时调节后,装置出口水肥溶液的均匀系数提高了31.46%.
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夏华猛
李红
陈超
张志洋
关键词溶解混施装置   施肥均匀性   水肥一体化   单片机   PWM脉宽调制     
Abstract: In order to improve fertilization uniformity of an integrated fertilizer dissolving and mixing device, and solve the problem in comprehensive control of irrigation quantity and fertilizer concentration during regulation of water and fertilizer, in this paper, an automatic control system for the integrated water fertilizer dissolving and mixing device was designed. STM 32 micro controller was used as the control core, the relationship between mass concentration and electrical conductivity of the fertilizer solution was determined by calibration experiments on fertilizer concentration. The fertilizer outlet concentration was detected in realtime by online with conductance electrodes and a related detection circuit. The mass concentration signal of fertilizer solution was fed back to the processor, and a control signal was generated, thus a closedloop control was constructed. A halfbridge circuit was adopted to drive a DC pump to regulate water flow, and the PWM pulse width modulation method was used to change solid fertilizer feeding rate inreal time, resulting an even more uniform and stable fertilizer outlet concentration. The fertilization performance of the device was tested; the result shows that the uniformity coefficient of water and fertilizer solution is increased by 31.46% after the control system in adjusted in realtime.
Key wordsdissolving and mixing device   fertilization uniformity   integration of water and fertilizer   MCU   PWM pulse width modulation   
收稿日期: 2018-05-15;
基金资助:

“十三五”国家重点研发计划项目(2017YFD0201502);公益性行业(农业)科研专项(201503130)

引用本文:   
夏华猛,李红,陈超等. 溶解混施水肥一体化装置自动控制系统研制[J]. 排灌机械工程学报, 2019, 37(1): 80-85.
XIA Hua-Meng,LI Hong,CHEN Chao et al. Development of automatic control system for integrated fertilizer dissolving and mixing device[J]. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(1): 80-85.
 
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