Research On Hydraulic Motor Drive Control System Of Variable Granular Fertilizer Application

Excessive application of fertilizer not only causes waste of fertilizer and reduces the utilization rate of fertilizer,but also causes serious environmental pollution.As most of the large fertilizer applicators still use traditional ground wheel drive for fertilizer application,the fertilizer application efficiency is low and the motor drive torque is small,which cannot be adapted to large fertilizer applicators.In view of the above problems and the characteristics of crop fertilization in Heilongjiang region,this paper researches the hydraulic drive control system of variable fertilizer application,which can be applied to real-time variable fertilizer application system,prescription map variable fertilizer application system and quantitative fertilizer application system with hydraulic drive as the power system to meet the agronomic requirements of fertilizer application in Heilongjiang region,and can realize a variety of fertilization operations with controlled variable fertilization requirements for the application of base fertilizer and It can be used to apply fertilizer and fertilizer.In this paper,the mathematical model of the system is established,simulation analysis is carried out,and bench test and field test are conducted for the hydraulic motor drive control system.The main research contents include:(1)The hydraulic motor drive system was established,the key parameters in the drive system were calculated,the hydraulic components needed in the drive system were selected,and the BMR160 hydraulic motor and PV70-30 solenoid proportional valve were selected as the key hydraulic components in the drive system.The AMESim simulation software was used to model the hydraulic drive system,set the parameters,conduct simulation tests and analyze the simulation results.(2)The integrated hydraulic valve block was designed to integrate the hydraulic drive system,and the integrated hydraulic valve block was modeled in three dimensions.After optimization,the pressure loss of the valve block was reduced,and the stress analysis and strength check of the valve block were carried out.The maximum deformation of the integrated valve block was0.52 mm and the allowable stress was 186.8MPa,which satisfied the stress and deformation requirements.(3)The mathematical model of the valve-controlled hydraulic motor system was established,and the transfer function of the solenoid proportional valve and the hydraulic motor was derived,and the dynamic characteristics of the system were analyzed.The control system adopts incremental PID control algorithm,and the control system model is built and simulated using simulation software.The controller program flow was developed,and the CAN bus communication protocol between the devices was determined.(4)A hydraulic motor drive control system test platform was fabricated and an indoor hydraulic motor no-load speed bench test was conducted,and the hydraulic motor speed control accuracy reached 99.05% during the indoor bench test.The field test of fertilizer application operation was conducted at Zhaoguang Farm in Bei’an City,Heilongjiang Province.The field test results showed that the overall speed control accuracy in the hydraulic motor drive control system reached 98.57%,and the hydraulic motor drive system has good synchronization,which can meet the actual fertilizer application operation requirements,and the system operation is reliable and stable.