关键词: 冲击实验台, 阀控非对称缸, 电液力控制, Simulink仿真

Abstract:

the mechanical steering gear of EPS is one of the main parts of the automotive steering assembly, in order to guarantee the safety of the vehicle, it is necessary to understand its impact resistance performance. The mechanical steering gear impact tester is mainly used for the impact test of the mechanical steering gear.  For the valve controlled asymmetric cylinder electro hydraulic servo force control system used in the impact tester was studied. Through the analysis of all components of the control system, establishing their mathematical models. Then got the mathematical model of the electric hydraulic servo system who regarded force as the control object. And the system was analyzed in frequency domain and time domain by using the Simulink simulation platform. Analysis indicated that the hydraulic closed-loop system is stable and can meet the performance requirements.

Key words: impact test machine, valve controlled asymmetric cylinder, force servo control, Simulink simulation