车载式变量施药机控制系统设计与试验

施药控制是提高作业质量、减少化学污染、降低生产成本的关键技术。该文基于单片机AT89C52，采用滞环控制法，设计了一种车载式变量施药机控制系统。该系统能够根据施药机行走速度自动变更喷药量，实现施药量不变。试验表明：加速度小于0.4 m/s2时，实际施药量与设定施药量之间的误差不超过8%，且雾化效果良好、生产效率高，还可以减少农药的残留和对环境的污染，能够满足农业生产的需要。

Design and experiment of control system of variable pesticide application machine hauled by tractor

Pesticide application control is the key technology to improve operation quality, reduce chemical pollution, and cut down costs of production. A control system of variable pesticide application machine hauled by tractor was designed based on AT89C52 using hysteresis control method. The system can automatically change spraying volume according to the speed of the tractor in order to stabilize pesticide application volume. Experiments show that: when the acceleration of the tractor is less than 0.4 m/s2, the error between the actual application pesticide volume and the pesticide application volume set does not exceed 8%. The highly efficient system has good atomization effect. It not only can reduce pesticide residues and environmental pollution, but also can meet the needs of agricultural production.