调压式变量喷雾系统设计与控制技术研究OA

In response to issues such as pesticide waste,environmental pollution,and low spraying accuracy in traditional spraying operations,a pressure-regulated variable spray control system was designed in this paper.The target flow rate was calculated in real time by collecting the travel speed of the sprayer and combining it with preset spray dosage parameters and nozzle characteristics.On this basis,a proportional control valve was used to adjust the pipeline pressure,and a PID closed-loop control algorithm was introduced to achieve precise tracking of the target flow rate.Core modules such as a speed sensor,turbine flowmeter,and proportional control valve were integrated,with the BRAVO 180S controller as the core to build a collaborative execution architecture.The software system was designed with two working modes:manual and automatic.Signal noise was suppressed using a moving average filtering algorithm,and parameter settings and operational status monitoring were completed via a touchscreen.Field test results showed that when the travel speed of the sprayer varied within the range of 0.5 to 2.0 m/s,the system's flow control error could be stabilized within 12％,significantly improving the uniformity of spray dosage per unit area.Thus,the pesticide usage and environmental pollution risks for field crops were effectively reduced.