The Design And Research Of Electric Hydraulic Power Steering System

High effective energy saving,high comfort performance and high security are thegoals of contemporary automobile technology.The first goal closely concerns with environment protecting,is also the popular topic around the world.The last two goals are the important subjects must be researched and solved in making automobile high performance.To make the steering system high performance is that the system can carry out mufti-goals control according to the vehicle states and driver requirements to acquire the steering handiness,better road feeling,better anti-interfering performance and faster response.The motor turning system is the essential part which affects the automobile operation stability,the travel security and the driving comfortablet.Nowadays we pursue highly effective energy conservation,the high comfortableness and high secure.The electrically hydraulic power steering system(EHPS) taking as one kind of new automobile power steering system,it takes the power steering engineering research the focal point by its energy conservation,the environmental protection,the better handling characteristic and changes the road feeling.The structure and operating principle of EHPS was analyzed in the paper.After that the operation principle of the hydraulic steering system and the structure of hydraulic redirector have been introduced for the establishment of the fluent dynamical model and the mathematical model of hydraulic redirector.Than the performance analysis of components of EHPS was done.Several parameters which impact system performance were analyzed.Emulation analysis had been on in order to check that performance was satisfactory.On the purpose of design of the Digital Electro-hydraulic Steering system, the detail analysis on the performance of hardware constitutes the system has been done. Finally,the experimental equipment was set up with similar principle,and the design of test system was finished.This thesis is at a certain extent helpful for later research of Electroic-hydraulic power steering system.How the parameters of the system elements impact the performace of the system can give us reference when we design and select the parements.The performance of the system is analysed through emulation,PID algorithm is added,the result shows that the system which we build has a high response speed,high steering precision.Final experiment results are anastomotic with the results of the emulation,which shows that the system we have designed is correspondence with demand of actual steering.