播种机嵌入式超高频无源RFID系统调速特性研究

Study on Speed Characteristics of Embedded UHF Passive RFID System in Seeding Machine

为了提高播种机播种距离的精度,减少排种器打滑现象,以及降低地形、地质对精密播种的影响,提出了一种新的超高频无源RFID调速优化方法。该方法考虑排种器无级变速和地轮的打滑,根据不同的地形和地质,可以自动调节播种机的速度,达到精密控制播距的效果。系统利用播距控制原理和RFID调速控制原理,将RFID嵌入到了轮胎和排种器中,以STC12C5A60S2作为主控芯片,实现了速度数据的采集、处理和调节。为了验证系统的有效性和可靠性,对普通机和调速机进行了播种测试,从而得到了速度随时间变化曲线及株距等测试数据。对数据进行分析发现:利用RFID调速优化的方法可以实现播种机速度的连续性控制,并且株距明显比普通机的变异系数小,播种精度有了大幅度的提高,可以为播种机的优化设计提供技术参考。

In order to improve the precision of sowing distance,reduce the seedmeter slipping phenomenon and influence of topography,improve the precision seeding,this paper proposes a new UHF Passive RFID timing optimization method.This method takes into account the metering device of stepless variable speed and wheel slip,according to different geological and terrain,can automatically adjust the seeding machine speed,to achieve the precise control of sowing distance effect.System uses the sowing distance control principle and RFID speed control principle,embedding the RFID into the tire and the metering device,with STC12C5A60S2 as the main control chip,realize data acquisition,processing and adjusting the speed of data.In order to verify the validity and reliability of system,the ordinary machine and a speed adjusting machine sowing test,through the test obtained velocity changes with time curve and the spacing and other test data.Analysis of the data,it can achieve a speed planter of continuous control by using the method of RFID optimal speed,and plant spacing is more obvious than the coefficient of variation of ordinary machine small,seeding accuracy has been greatly improved,which can provide technical reference for optimization design of seeder.