Design And Practice Of The Electro-hydraulic Control System For YL450t Transporting Girder Vehicle

According to the request of the23th Bureau of the China Railway ConstructionGroup, Yanshan University and Beijing Baishan Heavy Industries Co., Ltd. are teamingon the YL450t transporting girder vehicle, which is for the requirement of the25-meterand30-meter long double-line concrete girder transport and overlaying for the extensionof Chengdu Metro Line2. This article elaborates on the electro-hydraulic control systemof the YL450t transporting girder vehicle.First of all, determines the key design parameters based on working conditions.According to the mechanical structure and system parameters of the YL450t transportinggirder vehicle, the full hydraulic system is designed. Reasonable scheme of the drivesystem is selected, designed and calculated. The hydraulic steering system is a critical partof the open hydraulic circuits. The paper studies the work theory of the hydraulic steeringsystem, and builds its mathematical model. Electro-hydraulic proportional sectional valvesare realized with load sensing control, and the pump output power is adaptive to load, thesystem effectiveness is highly enhanced. The design of hydraulic system principle diagramis put forward.Secondly, the hydraulic steering system faces two problems of uncoordinated actionsof hydraulic cylinders and slow response speed. Aimed at the requirement of stability,accuracy and rapidity in hydraulic steering system of transporting girder vehicle, thecontrol policy of fuzzy PID is put forward, and the Simulink toolbox of MATLABsoftware is used to carry out computer simulation in base of its mathematical model. Theresults show that, compared with PID control, fuzzy PID control is more effective insuppression of the overshoot, and reducing the steady state error, and there is also a certainadvantage in controlling time.Finally, the paper designs and implements electro-hydraulic steering control systemfor YL450t transporting girder vehicle based on CAN Field Bus. This article introducesthe electrical characteristics of the key hydraulic components, selects appropriate electriccontrolled elements. The topology of the network is designed to determine the connectionbetween the electric elements, and controllers are arranged in the appropriate workspace. In BODAS software development environment, programs are written for the YL450ttransporting girder vehicle to make the action under different working modes.