Research On Tillage Control System Of Rotary Tiller Depth Based On AMESim And Simulink

As an important tillage machine,rotary tiller is used in field operations.The stability of tillage depth control is one of the important measures to improve the quality of farming.Taking the rotary working unit of a rotary tiller as the research object,according to the working requirements of the rotary tiller depth control,the hydraulic driving system of rotary tilling were designed,and the automatic control of the tillage depth was realized by electronic control and hydraulic technology.According to the model of the selected component,AMESim simulation mode of the hydraulic system was build,and set the simulation parameters.The dynamics simulation study of the system is carried out for two different working conditions.Major works accomplished in this study are listed as follows:The hydraulic system schematic diagram is determined by analyzing the requirements of the rotary tiller depth control system and related field condition.The working hydraulic pressure,the required power of rotary working unit and the maximum working load required for the rotary tilling etc.are determined according to the relevant hydraulic system design manual.and design and select the main components of the system.According to the designed hydraulic drive system of the rotary tiller,the system of simulation AMESim model is built,and the simulation parameters are set according to the model of the selected components.From the 0 position to the specified tillage depth and changing tillage depth,the dynamics simulation study of the two working conditions is researched.Through the analysis of the parameters of the cylinder flow without the rod,the pressure and the displacement of the piston rod,due to the external load,its own inertia,and the delay of the flow regulation,the results show that Overshoot of the piston rod occurs when moves to the target displacement.,the system oscillation time becomes longer;at the same time,the system also produces a large overflow,and the volumetric efficiency is reduced,resulting in a decrease in the efficiency of the rotary tiller engine.As the low efficiency of system efficiency,the comprehensive resistance coefficient is used to convert the traction resistance and the depth control of the rotary tiller into the fuzzy control of the hydraulic cylinder's telescopic displacement,and the tillage depth control of the Simulink-AMESim simulation model of rotary tiller was build.The simulation results show that the method can effectively improve the response time of the hydraulic cylinder,reduce the overshoot of flow of the hydraulic cylinder,reduce the system oscillation time,improve the stability of system,effectively improve the system volumetric efficiency,reduce fuel consumption,and improve the operation.When the rotary tiller encounters a sudden increase in soil resistance during the rotary tilling operation,the method can effectively improve the rotational speed stability of the hydraulic motor controlled by the depth of the tillage,and can reduce the speed fluctuates of the rotary tillage and improve system stability and efficiency of rotary tillage.