ASSESSMENT OF THE EFFECT OF STRUCTURAL PARAMETERS ON THE CHARACTERISTICS OF C-EPS STEERING SYSTEM

Abstract

Electric power steering systems are increasingly being used in modern cars. In
this paper, the authors have focused on studying the electric power steering system
with the power steering motor mounted on the steering shaft (C-EPS), thereby
building a mechanical model, establishing the dynamic equations and expressed
these equations in the state-space form. The technical parameters affecting the
performance of the C-EPS steering system to be considered include: steering
column inertia, steering column stiffness, column damping, rack stiffness, rack
damping, steering column pinion radius. The simulation results in the frequency
domain and the time domain have shown the influence of structural parameters on
the system characteristics. When changing the magnitude of the structural
parameters, the characteristics of the steering system change relatively large. The
results of this study are the premise to develop electric power steering control
strategies considering the uncertainty of structural parameters.