Design And Experiment Of Intelligent Control System Of Plot Chinese Cabbage Seed Combine Harvester

With the rapid development of economy and society,the area of arable land in our country is constantly decreasing,and the people’s demand for food diversity is becoming more and more obvious.In order to conform to the development trend of the times,we need to improve the basic materials and seeds of agricultural production,and improve the automation and intelligence level of the breeding community machinery,so as to reduce the work intensity of breeding experts and improve their work efficiency.This paper designs and develops a set of fault diagnosis and operating speed intelligent control system for the plot Chinese cabbage seed harvester.The main content includes the selection of monitoring objects and program design of the plot seed combine harvester,the mining of operating parameter association rules,the establishment of the operating speed control model,the establishment of fault diagnosis rules,the software and hardware design of the plot seed harvester intelligent control system,the on-board debugging and field control system test.The specific research content is as follows:(1)Determine the objects monitored by the system.By analyzing the operation process and blockage failure of the plot seed combine harvester,the working parts that can reflect the working status of the harvester are analyzed as the target object.The input of the established system includes: reel speed,feed auger speed,threshing drum speed,cleaning fan speed,engine temperature,and design the overall system plan.According to system requirements,select system hardware and design configuration;(2)This paper establishes an algorithm for adjusting the forward speed of a plot Chinese cabbage seed harvester.Research the theory of association rules and mine the monitoring parameters.Use SQL Server to establish a database containing the main monitoring objects of the "Plot Seed Harvester Operation Parameter Sample Data",and use Analysis Service to mine the association rules between the operation parameters and the feed amount of the plot seed harvester.Since most of the current models only consider the influence of a single component’s speed change,this system integrates the knowledge of the operating parameter association rules on the basis of the ordinary PID model.Establish a forward speed fuzzy PID controller and fuzzy control rule table based on association rules,and simulate the control algorithm.From the simulation results,it can be seen that when the feed volume increases by about 15%,the control model can effectively adjust the forward speed in time.Compared with the rated value,the relative change range of the drum speed in the steady state of the threshing drum is about 3.26%,and the algorithm can avoid the overload or blockage of the drum;the forward speed is compared with the set value,and the relative change in the steady state is about 6.67%;The system adjustment time is about 11 s.(3)The blockage fault diagnosis rules of the plot Chinese cabbage seed combine harvester in the plot have been established.When the speed sampling value drops to 90%of the rated speed,the system enters an early warning state;when the first-order differential value is negative for 4 consecutive times and the cumulative sum of the firstorder differential absolute value exceeds 4% of the rated speed,the system will give an early warning.When the speed sampling value drops to 85% of the rated speed,the system enters an alarm state;when the first-order differential value is negative for 4consecutive times,and the cumulative sum of the 4 first-order differential absolute values exceeds 10% of the rated speed,the system enter the alarm state.When the first-order difference value is negative and the second-order difference value increases twice in a row,the system enters an alarm state.The rest of the situation is ruled as normal.(4)Software design of the control system.According to system design requirements,the software design is mainly composed of S7-1200 PLC software programming and touch screen programming.The controller software design mainly includes signal acquisition,blockage fault diagnosis,fault alarm,automatic control of forward speed,and communication program with touch screen communication protocol.Touch screen software design includes the design of human-computer interaction interface,data storage and export function settings;(5)System onboard debugging and field harvest test.The control system is installed on the combine harvester and carried out on-board debugging.The debugging work is mainly to carry out the software and hardware debugging of the performance of the system.The result proves that the monitoring parameters are displayed normally,and the speed data storage function is verified.The system can normally store and record the speed data and export the data;In this paper,a field harvest experiment of Chinese cabbage seeds was carried out,and early warning and alarm tests were carried out under different conditions for the reel,feeding auger,threshing drum,and cleaning fan.The results show that the system can realize early warning and alarm according to the fault diagnosis rules of each component,and meet the system design requirements.