Design and Analysis of Suspension Guiding Mechanism of Independent Steer by wire System

Abstract:

In order to eliminate the interference between steering linkage and suspension guiding mechanism and to achieve accurate independent steering motion as well as to improve system integrated level and use the same independent suspension / in wheel motor module on both front and rear wheels of four wheels steering electric vehicles without axle shafts, an integrated system of the independent steer by wire system and the suspension guiding mechanism is presented. The formulas for the kinematic analysis of the suspension are derived based on the theory of spatial mechanism, and a sensitivity analysis of the single variables to the suspension kinematic parameters is done by using MATLAB. The virtual prototype model of the suspension guiding mechanism is established by using ADAMS/Car. The optimization variables are selected out according to the analysis results on MATLAB. A sensitivity analysis of the suspension guiding mechanism is made in the ADAMS/Insight, then the critical optimization design variables are found out. The suspension guiding mechanism is optimized according to the analysis results above. The kinematic performance of the suspension is improved.

Key words:independent steer by wire mechanism; double wishbone suspension; sensitivity analysis; kinematic parameters; optimization design