液压变量施肥控制系统设计与试验

Design and Experiment on Control System of Self-Propelled Variable-Rate Fertilizer

为解决现有水田撒肥机械存在肥量调节控制技术落后、不能适应变量作业工作要求等问题,设计了一种变量撒肥控制系统。通过分析国内外变量施肥技术研究情况,概述了变量撒肥机总体结构和工作原理,研究了控制内容和控制策略,确定了以AT89C51单片机作为主控制核心元件的计算机控制系统,进行软硬件设计和系统集成。通过场地和田间撒肥试验表明,撒肥机作业效率达到6 hm2/h施肥量偏差小于5%,排肥量稳定性变异系数仅为6.2%,撒肥机工作性能和控制系统设计满足水田变量撒肥工作要求。

In order to solve the problem of backward manure regulation control technology which was not suitable for variable-rate fertilization needs of paddy fertilizing machine ,a variable-rate fertilization control system was designed.Based on the domestic and foreigu research situations of the variable-rate fer- tilizing technology,the overall structure and working mechanism of the variable -rate fertilizing machine were described,and control content and strategy were studied,AT89C51single chip was used as a core con- trol element in the control system hardware and software ibere designed, and control system was＇ integrated. The variable-rate fertilizing experiment in space and paddy field shows that the working efficiency is up to 6hm2/h,the fertilizing error is less than 5%,and the fertilizing stability variation coefficient is only 6.2%, so the working performance and control system design of the fertilizer is suitable for spreading the fertilizer in variable rate widely and efficiently in paddy field.