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为提高变量施肥系统的工作稳定性,开发了一种基于复杂可编程逻辑器件(CPLD)的变量施肥控制系统。自动模式下,系统接收GPS信号确定施肥机位置和行进速度;手动模式下,系统通过速度传感器获取速度信号。系统将施肥机的行进速度与施肥处方信息相结合,控制排肥轴转速实现变量施肥。应用该系统进行变量施肥田间作业,累计作业面积达72hm2。应用结果表明,该系统以150～600kg/hm2实施变量施肥作业时,其排肥量误差小于6%。
In order to improve the stability of variable fertilization system, a variable fertilization control system based on complex programmable logic device (CPLD) was developed. In automatic mode, the system receives the GPS signal to determine the position and travel speed of the fertilizer machine. In manual mode, the system obtains the speed signal through the speed sensor. The system will fertilizer speed and fertilizer prescription information combined to control the speed of fertilizer shaft to achieve variable fertilization. Application of the system for variable fertilization field operations, the cumulative operating area of 72hm2. The application results show that when the system implements variable fertilization with 150 ~ 600kg / hm2, the error of the fertilizer output is less than 6%.