Design Of Electrohydraulic Valve Control Cylinder System With Hydraulic Resistance Full Bridge Network And Its Multimode Position Control

The traditional servo valve control cylinder system has limited control ability,poor energy-saving performance,and weak resistance to oil pollution,which cannot meet the requirements of the direction,flow,and pressure composite control function of hydraulic valves and comply with the intelligent development direction of hydraulic valves.Therefore,based on the principle of hydraulic resistance full bridge network electro-hydraulic valves,the position servo control characteristics are studied.This paper takes the hydraulic resistance full bridge network electro-hydraulic valve control cylinder system as the research object,designs the system,and divides the system into load port single side throttle mode and load port double side throttle mode.It conducts research on position servo control using multiple hydraulic resistance logic control mode.Firstly,an experimental platform for the hydraulic resistance full bridge network electro-hydraulic valve control cylinder system was established.According to the system principle,the hydraulic system and load mechanical structure of the experimental platform were designed from the perspective of design layout and load four quadrant working conditions,and the functions of each module of the electronic control system were analyzed in detail.Using AMESim+MATLAB-Simulink joint simulation,a virtual simulation platform for the hydraulic resistance full bridge network electro-hydraulic valve control cylinder system was established based on the key characteristic parameters of the samples.Open loop and closed loop simulations were conducted to verify the accuracy of the simulation model.Secondly,a mathematical model of the hydraulic resistance full bridge network electro-hydraulic valve control cylinder system is established,and the nonlinear model is linearized.According to the different conditions of the connection between the oil supply port and the oil outlet of the load port control valve,the system is mainly divided into the load port unilateral throttling mode and the load port bilateral throttling mode.According to the derived transfer function,the frequency characteristics of different modes of the system are analyzed,and the root locus diagram and Bode diagram are drawn using MATLAB software.The position servo control characteristics of different modes of the system are analyzed theoretically.Finally,the multi mode position control algorithm of the system is simulated and tested using a joint simulation platform and experimental platform.By analyzing the simulation and experimental results of different mode position control algorithms,the dead zone compensation laws and position control characteristics of different modes are systematically summarized,laying a foundation for further nonlinear position control algorithm design and improving the system position control performance in the future.