【作者】 王琦；

【导师】 汪懋华； 李民赞；

【作者基本信息】 中国农业大学 ， 农业电气化与自动化， 2005， 硕士

【摘要】 田间信息采集是精细农业技术体系中的重要环节,特别是产量信息获取尤为重要。本课题的目标在于:研究开发一个经济、实用的谷物测产系统智能监视器。 智能监视器是测产系统的中心。按照操作人员的控制,它采集各种传感器的信号,进行处理后,将其显示和存储。智能监视器的硬件平台开发基于低成本P80C592微控制器进行。该硬件平台满足了整个系统采集多路模拟信号(谷物流量、谷物湿度、温度和割台高度)、数字信号(地速和升运器转速)的需求:具备CompactFlashTM(CF)卡接口,可以在CF卡中存储大量测产数据;采用触摸屏和液晶显示屏的人机接口,为操作人员提供了良好的监控界面;具备符合CAN2.0A标准的总线通讯接口,为整个系统提供了良好的扩展能力。在系统资源有限的硬件平台上,智能监视器软件使用中断方式较好地协调了多个对实时性有一定要求的任务。性能测试表明,智能监视器软件能够满足系统需求。所编写的基于8051微控制器的写CF卡程序模块运行稳定,具有良好的兼容性,可以移植到多种8051内核的微控制器上。 使用智能监视器对测产系统的传感器进行了标定试验。共进行了3种类型的试验:室内性能测试、在联合收割机上的联机调试和田间试验。室内性能测试表明,流量传感器在联合收割机正常工作时的一般谷物流量范围内具有良好的线性度。通过在联合收割机上的联机调试,得到了割台高度传感器和升运器转速传感器的标定方程,提出了谷物流量传感器和地速传感器的实时标定方法。田间试验证明,通过实时标定,测产系统具备以较高精度进行谷物流量测量的能力。更多还原

【Abstract】 Data acquisition in fields, especially yield data acquisition, is an important step in precision agriculture. The goal of this project lay in the study and development of a practical and low cost yield monitor system for grain combine harvesters. This paper introduced the study and development of a console for the grain yield monitor system.Yield monitor console is the center of a yield monitor system. It collects data from sensors; display and store them after processing. The development of the console was based on a low cost microcontroller P80C592. The hardware platform met the needs for collecting 4 analog signals （grain flow, grain moisture, temperature and header height） and 2 digital signals （ground speed and elevator speed）. It supported a CompactFlash^TM （CF） card access to store yield data. Touch screen and liquid crystal display were applied in the hardware as a friendly man-machine interface. Its CAN2.0A interface enabled it to access Controller Area Network （CAN） easily. The software used interrupts to coordinate real time multitasks in the system. Performance tests showed that the software worked stably on the hardware. The software module of writing CF card had a good compatibility in running on different microcontrollers with 8051 core.The yield monitor console was used to calibrate sensors of the system. There were 3 kinds of tests, including laboratory test, combine harvester test and field test. Laboratory test showed that the grain flow sensor had a relatively good linearity. After the combine harvest test, calibration equations were found for header height sensor and elevator speed sensor; and real time calibration methods were proposed for grain flow sensor and ground speed sensor. Field test proved that the real time calibration method significantly improved the measurement accuracy of grain flow.更多还原