农业机械学报2012，Vol.43Issue(12)：87-93,129,8.DOI:10.6041/j.issn.1000-1298.2012.12.016
PWM间歇喷雾式变量喷施控制器设计与测试
Design and Test of Variable Rate Application Controller of Intermittent Spray Based on PWM
摘要
Abstract
In order to implement variable rate application control of intermittent spray based on pulse width modulation ( PWM ) technology, a blended pulse variable rate application controller was designed with its core part DSP56F805. The controller has two working modes. Operational parameters were set artificially in single mode, and received from upper computer through CAN bus in online mode. The controller can output 12 channels of PWM signal which can be adjusted individually. It also can monitor traveling speed of sprayer, rotational speed of diaphragm pump' s input shaft, spray pressure and application flow rates of each boom partition. In addition, the spray pressure can be regulated on-line by predictive control algorithm with proportional relief valve. A variable rate application system was constructed by integration of a modified commercial boom sprayer and the controller, and its performance tests were carried out. Test results showed that the maximal effective frequency of the PWM signal was within 5 Hz, the ratio of flow regulation was more than 10, measuring error was within ±0.1 km/h for the traveling speed, within ±1.5 r/min for the rotational speed, within ±0. 01 Mpa for the spray pressure and within ±0. 05 L/min for the flow rate, and regulating error of the spray pressure was within ±0. 01 Mpa in a 2 s regulating period.关键词
变量喷施/脉宽调制/控制器/流量调节/喷杆压力Key words
Variable rate application/ Pulse width modulation/ Controller/ Flow regulating/ Spray pressure分类
农业科技引用本文复制引用
魏新华,蒋杉,孙宏伟,徐来齐..PWM间歇喷雾式变量喷施控制器设计与测试[J].农业机械学报,2012,43(12):87-93,129,8.基金项目
江苏省自然科学基金资助项目(BK2009200)、镇江市农业科技支撑计划资助项目(NY201025)、江苏高校优势学科建设工程资助项目(苏财教(2011)8号)和江苏省农业装备智能化高技术研究重点实验室资助项目(BM2009703) （BK2009200）
