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정적 메시지 재할당을 이용한 FlexRay 네트워크 사용효율 개선 기법
서병석(Byungseok Seo),진성호(Sungho Jin),이동익(Dongik Lee) 한국자동차공학회 2013 한국 자동차공학회논문집 Vol.21 No.5
This paper presents a mathematical model to determine the optimal length of static messages that can achieve more efficient use of a FlexRay network. In order to determine the optimal length of static message, the proposed model evaluates the given set of messages with respect to a network utilization index, which is defined in this work. The efficient use of a FlexRay network is achieved by reallocating any static message whose length is equal or greater than the resulting value to the dynamic segment. The effectiveness of the proposed method is investigated by applying to the SAE benchmark data.
Dynamic Inversion 기법을 이용한 전자제어 조향 시스템 제어기 설계
서병석(Byungseok Seo),양인석(Inseok Yang),변성일(Seongil Byun),이동익(Dongik Lee) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Electric Power Steering(EPS) system has been developed in the last decade. Control strategy of EPS system is the core technology, which offer a various driving feelings and improve response time and accuracy. Many of control strategy is researched such as sliding mode control, H infinite control so on. But this controller is not guaranteed safe-critical system’s requirements and very complex. For this reason, the paper aims at designing a robust controller with dynamic inversion method, strengthening the robustness on stability and providing fast and accuracy response. The simulation results verified the effect of proposed controller.
서병석(Byungseok Seo),이동익(Dongik Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
This paper presents the fault detection and isolation strategy for electric vehicle(EV). Unlike the conventional internal combustion engine vehicle, electric vehicle is consist of electric motor, inverter, battery-management system(BMS), etc. For this reason, electric vehicle has a new failure modes. Vehicle system is a safety-critical system. There are high demands on safety. In this paper, we analysis of electric vehicle failure mode using Fault Tree Analysis(FTA) method. The result of Motor/inverter and battery system fault tree analysis are shown in conclusion.