Simulation Analysis on Hydraulic Power Assisted Steering System

The mechanical subsystem and hydraulic subsystem in hydraulic power assisted steering gear of automobile are analysized in detail. By combining both systems , the mathematical model for hydraulic power steering gear of automobile is established. In addition, the Matlab Simulink simulation model is presented. Different parameters of hydraulic oil feeding, bar spring stiffness of servo-valve, and effective area of cylinder piston are selected in simulating programming. It is found from simulating results that hydraulic oil feeding of steering system and effective area of cylinder piston have more effect on the rack dynamic response of steering gear than the stiffness of bar spring stiffness of servo-valve.