Match Research Of Hight Capacity Electro-hydraulic Proportional Direction Valves

Manufacturing industry is the pillar of the national economy, and the basepart is anintegral part of the national major equipment. Hydraulic components in the basepart havealways been the weak link, which could restrict the development of our country’smechanical industry. Moreover, high-performance electro-hydraulic proportional valve isone of the most prominent key in hydraulic components. In this paper, the design andcontrol method of this kind of valve has been deeply researched and discussed. To realizestructure parameters matching of the pilot valve and proportional control amplifier’smatching with proportional direction valve and improve position control performance ofthe proportion direction valve, this paper has taken coefficient of the pilot valve andcompensation of nonlinear factors as the breakthrough point, and focused on key matchingtechnologys of high-performance electro-hydraulic proportional directional valve. Themain work and research content is as follows.Electro-hydraulic proportional directional valve’s research status at home and abroadwas summarized, and then structure of the polite valve was determined according to thesituation of the domestic technology; Influence on the position closed loop control systemof dead zone and friction was analyzed, and the necessity of nonlinear compensation waspointed out; Stability criterion of the high-performance electro-hydraulic proportionaldirectional valve was arrived by virtue of the theory of describing function methods; andthen static and dynamic parameters of LuGre friction model was obtained, which laid thefoundation of the following design and optimization of structural parameters andcompensation of nonlinear factors.According to operating characteristics of the main valve, main structure sizes of thepilot valve were determined, and combining with the pilot valve’s coefficient and theposition control performance, a U groove was designed, a digital optimization matchingmethod was proposed aiming at structure parameters of the throttling groove. On this basis,the co-simulation of high-performance electro-hydraulic proportional directional valvewas established, and characteristics of steady-state flow force, flow and pressure of the polite valve were studied.The relay type nonlinear control signal was used to compensate the dead zonenonlinear, which could create a good environment for friction compensation; A variety offriction compensation strategy was used, and the different effect of those was analyzed,and then the conclusion that the adaptive compensation based on LuGre friction modelcould have obvious advantages in terms of friction compensation was arrived, whichwould greatly improve low speed tracking performance of the position control system.The results of the experiment was evaluated, and they were consistent with the resultsof simulation, which could show that the co-simulation established in this paper wasrelatively accurate, and matching method was feasible to achieve the matching with thepolite valve and main valve.