Abstract
Abstract : For the robust design of Motor Driven Power Steering (MDPS) systems, it is important to consider energy efficiency from every aspect such as system configuration and current flow, etc. If design optimization is not considered, it has many problems on a vehicle. For example, when evaluating steering test, particularly the Catch-up test which turning the steering wheel left or right quickly, steering effort should be increased rapidly. Also a vehicle might have poor fuel efficiency. In this study, it is calculated energy consumption for each component of the steering system and analyzed factors of energy consumption. As a result, this paper redefines a method to estimate steering input torque using characteristics of vehicle electric components and then conducts an analysis of contribution for the Catch-up. Key words : Catch-up(캐치업), Rack force(랙추력), Energy consumption(소비에너지), Motor driven power steering (전동식 파워 스티어링), Robust design(강건설계) Nomenclature 1) P : power consumption [W]V : voltage [V]I : current [A]R : resistance [Ω]F : rack force [N]ω : angular velocity [rad/s]T : torque [Nm]C : gear ratio [m/rev]L : ball screw lead [m/rev]l : wire length [m]K : motor torque constantη : efficiencyr : reduction ratio
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