Electro-hydraulic Position System With High Speed Solenoid Valve And Its Characteristic Research

High-speed solenoid valve with its simple structure, rapid response, anti-pollution ability,so widely used in various fields of industry. High-speed solenoid valve used PWM controlmethod, realized the digital electro-hydraulic system, so is gradually replace expensive servovalve.Based on High speed solenoid valve as the main research object, by the means of thetheoretical analysis, mathematical modeling, and the simulation analysis phase conjunctivelymethod. In-depth analysis and research on the no-load flow and response characteristics ofHigh-speed solenoid valve has great guidance significance to the high speed solenoid valvephysical change, and with high speed solenoid switch valve as the foundation built new type ofelectro-hydraulic position system.Aiming at the high speed solenoid valve of no-load flow is analyzed in theory, and usingsoftware AMESim established valve model, and through the simulation data collection andanalysis, the conclusion and the theoretical analysis is consistent, namely high speed solenoidvalve of no-load flow has no concern with PWM signal cycle, only with PWM signal dutyfactorrelated, in the duty cycle of17%~85%, has a good linear relation between them.According to the high speed solenoid valve core components-electromagnet have carriedon the finite element analysis, through solving, obtained the relationship of function betweenelectromagnetic force and the valve core displacement, for the next dynamic analysis provide thenecessary data to support. Based on analysis of valve core action in theory, respectively inelectric, magnetic, sports three aspects to establish the valve nonlinear mathematical model,using MATLAB software Simulink toolkit simulation analysis to get the effect of high-speedsolenoid valve dynamic response factor. Through times of simulation experiment, obtains theoptimal valve key data. In order to optimize the data as the foundation, using MATLAB softwareto get bode diagram confirmed the high speed solenoid switch valve stability. In order to extendthe valve core life, avoid excessive collision, this paper also analyzes the high-speed solenoidvalve in the high frequency pulse under the action of proportional function. Through thesimulation got the powerful data support, proof valve in the high frequency pulse signal of theexact proportion function is feasible. In order to meet the high speed solenoid valve to current technical requirements (largecurrent start, small current maintain), this paper adopted PWM modulation drive mode, and indifferent duty ratio PWM signal generation and driving mode principle do meticulous analysis,design the actual high-speed solenoid valve drive circuit, and then through the simulation resultsto see, realize the large current start, small current maintain technical requirements.In this paper, a new electro-hydraulic position system is established on the basis ofhigh-speed solenoid valve. Based on the principle of the system and model analysis, it isconcluded that the model of transfer function.According to its open loop transfer function for thestability of the system of the open loop gain, and use the simulation get Bode diagram and Nicholsdiagram, verified the stability of the system. In order to realize hydraulic cylinder of smooth startand stop, the acceleration of the piston is optimized. Then the analysis of system error sourcesand influence factors, in order to eliminate the electro-hydraulic position system follow error,this paper adopted the predicted control strategy, respectively from the two aspects of theory andsimulation is analyzed, the simulation results show that the control method can effectivelyimprove the electro-hydraulic position system positioning accuracy.