Research on Control Strategy of Vehicle Shock Absorber Testing Bench

Abstract

The testing platform of shock absorber powered by hydraulic system is researched and developed, which can meet the need of performance testing for the high-speed and high-precision shock absorber. The characteristics of valve coefficient asymmetry caused by different loads when the electro-hydraulic servo system moves in two directions are analyzed by establishing mathematical model of the hydraulic testing platform power mechanism. The nonlinear compensation strategy of servo valve flow is introduced to make the linear relationship between the load flow and spool displacement, and then realizing the linear control for this system. To avoid hydraulic shock in the process of hydraulic dynamical outfit on reversing, the impact suppression parameters are designed in the nonlinear flow compensation control strategy. A rapidly control prototype based on xPC of the testing platform is devised, and the performance test was conducted on the developed shock absorber. Test results prove that the developed shock absorber testing platform electro-hydraulic servo control system meets the needs of performance testing, which has vital engineering research significance.