中文摘要：

利用车辆动力学建模仿真软件CarSim联合Matlab／Simulink建立了电动助力转向（EPS）和半主动悬架（SAS）系统仿真模型。将车辆底盘EPS和SAS系统分为4个模块单独建模，结合carsim系统模型，构架出一个完整的车辆模型。模型的各个模块相互独立，便于构建硬件在环仿真系统，研究EPS和SAS系统各部分对车辆操纵稳定性和行驶平顺性的影响情况。仿真结果表明：开发的EPS和SAS系统仿真模型能够实现提供转向助力和调节悬架阻尼力的作用。

英文摘要：

An electric power steering （EPS） and semi-active suspension （SAS） system simulation model was built by using vehicle system dynamics software CarSim and MATLAB/Simulink. Chassis EPS and SAS system were divided into four modules which was built separated, combined with vehicle system model on CarSim, a complete vehicle model was constructed. Each module of the model was independent for easy to build hardware in the loop system. And easily to study the various parts of the EPS and SAS system effect on vehicle＇ s handling stability and riding comfortably. Compared with the simulation analysis results on CarSim, showed that the EPS and SAS system simulation model was able to provide steering power and adjust suspension damping force