基于CAN总线的智能微喷灌监控系统设计

发布时间：2018-09-19 09:23

【摘要】：本文重点阐述了基于CAN总线的智能微喷灌监控系统中下位机(智能节点)的硬件电路组成及软件程序的设计。此微喷灌控制系统既可以实现所需的控制功能和要求,并且物美价廉,操作简单,适用性广,有很高的性价比。利用直接推理法和模糊逻辑工具及模块完成对土壤层湿度模糊控制器的建模和仿真验证。硬件电路主要由I/O接口电路、按键电路、数据采集电路、时钟电路、输入输出控制电路以及存储电路等构成。实际应用中,根据管理要求和控制成本,用户可以选择不同的控制方式,并决定是否配选相应的土壤层水分传感器,实现灵活、实用的系统配置;该系统已在娄底职院农林工程系苗圃园进行了试运行,运行情况良好,为大型、远程控制网络的实现奠定了研究基础。主要研究内容有:(1)根据按需喷灌的原理,系统地研究作物需水量的计算方法,将参考作物蒸发量参数估算模型用于本系统喷灌补给水量的计算中,通过将易于获取的环境参数的收集,精确计算作物的蒸发量,从而科学指导喷灌操作过程,有效地调节土壤层环境的水分状况。(2)结合区域内现有条件,根据土壤层的特性,从系统功能要求出发,把系统分为五个模块,进而确定系统的总体结构,并按成本核算、可靠程度、功耗等设计原则,分别设计基于STC89C52微处理器和SJA1000芯片的CAN总线适配控制器的数据采集的模块、控制执行模块和数据处理模块的硬件和软件系统。(3)基于模块设计思想理念,进行各功能模块的CAN总线通信设计,对接收现场控制器各项输出控制信息及当前的状态信息,进行分析处理,从而实现对系统的实时在线控制。通过测试运行效果检测系统的整体功能和稳定性。
[Abstract]:This paper focuses on the hardware circuit composition and software design of the intelligent micro-sprinkler monitoring system based on CAN bus. The micro sprinkler irrigation control system can not only achieve the required control functions and requirements, but also has the advantages of good quality and low cost, simple operation, wide applicability and high performance to price ratio. Using direct inference method and fuzzy logic tools and modules, the modeling and simulation of soil layer moisture fuzzy controller are completed. The hardware circuit is mainly composed of I / O interface circuit, keystroke circuit, data acquisition circuit, clock circuit, input and output control circuit and storage circuit. In practical application, according to the management requirements and control costs, the user can choose different control methods, and decide whether to choose the corresponding soil layer moisture sensor to achieve flexible and practical system configuration; The system has been put into trial operation in Nursery Garden of Agriculture and Forestry Engineering Department of Loudi Vocational College, which has laid a research foundation for the realization of large-scale and remote control network. The main research contents are as follows: (1) according to the principle of sprinkler irrigation on demand, the calculation method of crop water demand is systematically studied, and the estimation model of reference crop evaporation parameters is applied to the calculation of sprinkler recharge water in this system. By collecting the easily acquired environmental parameters, accurately calculating the evaporation of crops, thus scientifically guiding the operation process of sprinkler irrigation and effectively regulating the water state of the soil layer environment. (2) according to the characteristics of the soil layer, combined with the existing conditions in the region, According to the requirement of system function, the system is divided into five modules, and then the overall structure of the system is determined, and according to the design principles of cost accounting, reliability, power consumption, etc. The data acquisition module of CAN bus adaptor controller based on STC89C52 microprocessor and SJA1000 chip is designed, and the hardware and software system of control module and data processing module are designed. (3) based on the idea of module design, The CAN bus communication design of each function module is carried out, and the output control information and current state information of the field controller are analyzed and processed, so as to realize the real-time on-line control of the system. The whole function and stability of the system are tested.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：S275.5;TP277

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