C-MDPS 차량의 응답 성능 최적화 연구

Abstract

Column type of motor driven power steering(C-MDPS) system has been developed for driving convenience and fuel efficiency. Nowadays, it requires agile vehicle response when driver tries to steer the steering wheel. So rack type MDPS(R-MDPS) system is often considered to improve vehicle response, but it is difficult to apply due to package problem and high cost. This paper proposes a design methodology about C-MDPS vehicle in terms of maximizing vehicle response. Among various design parameters which affect vehicle response, this paper deals with steering and suspension system design factors. The main parameters in the steering system are component characteristics such as friction level or torsion bar stiffness. The main parameters in the suspension system are kinematic and compliance (K&C) characteristics such as lateral force stiffness or kinematic displacement. In this paper, influence analysis method and optimization process for these factors are suggested.