The Research Of The EPS's Application On The Medium Cross-country Vehicles

As the important component of the cross-country vehicle's chassis,the performance of the steering system will directly affect the vehicle's flexibility,handling stability and portability.At present,most medium cross-country vehicles using mature technology of hydraulic power steering system to improve the driver's labor intensity, and increased its traffic safety and flexibility.However,the inherent shortage of the hydraulic system of energy consumption and the possible environmental pollution has become increasingly obvious,hydraulic power steering system can not fully meet the development of the times.There are a lot of foreign companies and universities to research the EPS,the technology of EPS has been increasingly perfect and has the good prospect on the medium cross-country vehicle's application.This thesis simulates and analyzes the multi-body dynamic model of medium cross-country vehicle equipped with EPS based on ADAMS simulation software.The main research content is as follows:1.Has outlined cross-country vehicle's steering system,analyzed the medium cross-country vehicle to use EPS the feasibility from two aspects of the assist force and the cost.Then introduce briefly of the idea of our country's automotive industry applying EPS and HEPS.And introduce the present development situation of EPS,the structure,the principle of work,the key component,the type and the main advantage.2.Has carried on the detailed introduction to the mufti-body dynamics simulation software ADAMS and introduced the modeling flow of ADAMS/Car as well as the modeling process using ADAMS/Car,described the simplification and the assumption, various subsystems as well as the modeling method of assemble full vehicle.3.Analyze the concept of assist-characteristic curve,requirements and three typical assist-characteristic curves,and select the linear assistance strategy carried out a detailed analysis,research the system's assist-characteristic parameter and formmate, and establish a group of linear assist-characteristic curve suited to the Model.Then introduce the implement method of ADAMS-MATLAB Co-simulation.And carry on the simulation in double lane change condition.