| With the development of science and technology,the demand for intelligent products in the construction machinery industry is increasing.Intelligence has always been the general direction of development in the field of construction machinery,and the electrohydraulic proportional pressure reducing valve is a key component of electro-hydraulic conversion in construction machinery,and an indispensable part of the intelligent development of construction machinery such as excavators and cranes..However,the electro-hydraulic proportional pressure reducing valve has problems such as hysteresis and nonlinearity,which causes the linearity between the command signal and the output signal of the large construction machinery to decrease during the working process,and further reduces the intelligent degree and control accuracy of the construction machinery.Therefore,based on the development and application background of electro-hydraulic proportional pressure reducing valve in construction machinery,this topic summarizes the current research status of hysteresis nonlinear control compensation of electro-hydraulic proportional pressure reducing valve.The hysteresis characteristics of the hydraulic proportional pressure reducing valve are subjected to theoretical analysis,simulation research,experimental testing,and control compensation.By reducing the pressure hysteresis of the electro-hydraulic proportional reducing valve,the linearity between the output pressure and the input current of the electro-hydraulic proportional reducing valve is improved.The main research contents are as follows:(1)Mapping a certain type of electro-hydraulic proportional pressure reducing valve,based on the analysis of the working principle of the electro-hydraulic proportional pressure reducing valve,calculating the flow area of each valve port of the spool,establishing the mathematical model of the electro-hydraulic proportional pressure reducing valve,and theoretical analysis The hysteresis of the electro-hydraulic proportional pressure reducing valve is affected by factors,and finally the particle swarm algorithm is used to fit the pressure hysteresis curve of the electro-hydraulic proportional pressure reducing valve.(2)According to the state space equation,combined with the friction model,a Matlab/Simulink simulation model of the electro-hydraulic proportional pressure reducing valve is established.Simulate and analyze the dynamic response characteristics of the electro-hydraulic proportional pressure reducing valve,and analyze the influence of the different speed of the given signal on the hysteresis of the electro-hydraulic proportional pressure reducing valve according to the theoretical analysis results(3)According to the theoretical and simulation analysis results,the influence of different given signal rates on the hysteresis of the electro-hydraulic proportional pressure reducing valve is analyzed,and the nonlinear control compensation algorithm for reducing the hysteresis is proposed,which is verified on the simulation model.(4)The electro-hydraulic proportional pressure reducing valve hysteresis test program is compiled to test the influence of different influencing factors on the electro-hydraulic proportional pressure reducing valve hysteresis.According to the control compensation ideas that have been verified in the simulation model,experimental tests are carried out to improve the electro-hydraulic The linearity between the output pressure of the proportional pressure reducing valve and the input signal and the dynamic and static performance of the pressure reducing valve. |
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