Study On And Hydraulic System Of Vehicle Hydraulic Steering

The theory of vehicle hydraulic steering system is introduced primarily, because the controlled parameter is position in the vehicle hydraulic steering system, at the same time the feedback message and input message are position parameters too, For messages passed by mechanic-hydraulic mode, so it is the key that we employ the mechanic-hydraulic mode of servo-control system in the vehicle hydraulic steering system, for that steering technology affect the vehicle capability directly such as high control-accuracy rapidity response-velocity, high capability and low expense.In order to establish the mathematic model of the hydraulic steering system, at first the hydraulic servo-control system is designed in the article through device, proofs and contrasts, after establishing corresponding mathematic model article searched for thebetter parameters on the kind of specific automobile' s structure and capability. It is the key to corroborate the parameters such as pressure P, capacity q and power P of the constant-displacement pump , so to ascertain and chose the hydraulic servo slippedvalve' s parameters in course of the analysis of static state and dynamic state. After corroborating the parameters such as diameter D, volume V etc of hydraulic cylinder and hydraulic added unit like oil-case , pipeline for example with the analysis of static state and dynamic state too, then a parameter list is obtained.At last the nonlinear mathematic model was dealt with pressure-flux equation , fluid continuous equation and dynamic equilibrium equation on the rationally simplified hydraulic system ,then system opened loop transfer function and frame are obtained with Laplace Transform, so system closed loop transfer function and frame come by.with the Simulink software package of Matlab, simulation model on computer of hydraulic steering system is established and at the same time gain the result and conclusion, on the base of the simulation result, the hydraulic steering systems stability and other capabilityindexes are analyzed, in addition the crucial unit' s reliability is analyzed with Finite Elements Method, a reliable vehicle hydraulic steering system is designed ultimately by simulation and experimentations.