基于CAN总线的谷物产量快速计量系统研发

It depended on the spatial and temporal variation of soil and grain yield to implement precision in yield monitoring on combine harvester was a cornerstone of precision intelligent grain yield monitoring system with the sensors and DGPS(differential global positioning system),which was loaded on the combine harvester,could get the different blocks’yield and produce the yield this study,a new grain yield monitoring system based on CAN bus technology was system consisted of sensor unit,data acquisition unit,GPS module and LCD(liquid crystal display) grain yield data were collected by the grain flow sensor,and processed by the signal condition then the grain yield data and GPS signal were transmitted to the control unit by CAN h the algorithm of grain yield conversion,all the collected data including real-time grain yield,harvest area and average grain yield were displayed on the LCD w sensor unit included grain yield flow sensor,force impact plate and mounting sensor frame was mounted at the top of clean grain elevator of combine n the elevator paddles rotated around the sprocket,grain was propelled towards a flat impact grain momentum was lost in the subsequent collision with the impact plate,an effective force was measured by the impact parallel-beam load ng with the calibration relationship between measured force and mass flow rate,the output of the impact parallel-beam load cell could indicate the flow rate of grain a acquisition unit included power conversion circuit,sensor signal acquisition circuit,analog-to-digital conversion circuit and CAN communication could fulfill data acquisition function,CAN communication function and interrupt handling terminal had the function of sensor detection,the function of GPS information collection,parameter calibration,data display and could display the real-time grain yield,total yield,average yield and harvest order to evaluate the grain yield monitoring system,3 experiments which included static performance experiment of grain yield flow sensor,platform test experiment of grain yield monitoring system and dynamic performance experiment on combine harvester were carried result of platform test experiment showed that the system error between predicted yield and measured yield was less than 3%and the system could avoid the effect of vibration from the platform ld dynamic experiment showed that the system error was less than 5%.Both the experimental results indicated that the grain yield monitoring system could satisfy the need of practical production.