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이민광(Minkwang Lee),윤마루(Maru Yoon),선우명호(Myoungho Sunwoo),박승범(Seungbum Park),이기상(Kisang Lee) 한국자동차공학회 2005 한국자동차공학회 Symposium Vol.- No.-
The detection of engine misfire events is one of major concerns in engine control due to its negative effect on air pollution and engine performance. In this paper, a misfire detection system based on crankshaft angular speed fluctuation is developed. Synthetic variable method is adopted for the preprocessing of crankshaft angular speed. This method successfully estimates the work output of each cylinder by finding the effect of combustion energy on the crankshaft rotational speed or acceleration after virtually removing the effect of the internal inertia forces from the measured crankshaft speed signals. The detection system is developed using neural network with the revised synthetic angular acceleration as input which is derived from the preprocessing. Mathematical simulation is carried out for developing and verifying the misfire detection system. Finally, the reliability of the developed system is validated through an experiment.
차체제어시스템 개발을 위한 네트워크기반 HILS 환경 개발
이민광(minkwang Lee),윤마루(Maru Yoon),신민석(Minsuk Shin),선우명호(Myoungho Sunwoo) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The Hardware-In-the-Loop Simulation(HILS) is a technique whereby real control systems can be evaluated against simulations of the plant-under-control. This reduces dependence on a prototype plant, especially in the early stages of development process, and therefore reduces the time, effort and resources required to build and support control systems. For these reasons, the utilization of HILS has been increasing in many fields of research. In this paper, mathematical models of body system are derived and controllers are designed for body system HILS based on Network. Using autocode generation. the models and controllers are downloaded to the target computers and Electronic Control Unit (ECU). In addition, the network based body control system is implemented via CAN protocol.
Joonhee Lee,Hyunjun Lee,Minkwang Lee,Myoungho Sunwoo 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
This paper proposes a nonlinear sliding mode observer for exhaust pressure estimation. A precise estimation of the exhaust pressure is important for the control of a variable geometry turbocharger (VGT) and exhaust gas recirculation (EGR) system. In order to estimate the exhaust pressure accurately, we derive nonlinear dynamic models of the intake and exhaust pressure in diesel engines based on the energy and mass conservation laws. The model parameters which vary with the engine operating conditions are modeled through an empirical approach to consider physical phenomenon of each component. We develop the nonlinear sliding mode observer for the exhaust pressure estimation to deal with nonlinear dynamics of the diesel engine air system. The stability of the proposed observer is guaranteed by the Lyapunov stability criterion. Moreover, the estimation performance is improved by adding a damping term into the observer. The proposed observer is implemented in a real-time embedded system and the experimental results represent that the observer estimates exhaust pressure precisely in both steady and transient engine operating conditions.
1.4 L CNG 엔진에서 아이들 제어 및 전기 히터 적용이 촉매 활성화에 미치는 영향
이상현(Sanghyun Lee),이민광(Minkwang Lee),한만배(Manbae Han) 한국자동차공학회 2021 한국 자동차공학회논문집 Vol.29 No.7
The application of compressed natural gas(CNG) to passenger cars has drawn attention as a type of fuel that can cope with globally strengthened emission regulations due to its low CO₂ emission potential. This study investigates a 1.4 L CNG engine, in which idle speed control and an electric heater can affect the increase in the exhaust gas temperature, thus improving catalyst light-off characteristics. Idle speed control parameters, the idle target speed, fuel injection timing, and ignition timing were selected because their effects on the exhaust gas temperature and exhaust emissions could be significant. Moreover, an electric heater was installed in front of the MCC catalyst for the rapid catalyst light-off, thus increasing exhaust gas temperature, which was evaluated at the low phase of the WLTP test cycle.
Nonlinear Modeling and Sliding Mode Control of a Vane-Type Variable Valve Timing System
Myeong-hyeon Son,Minkwang Lee,Kangyoon Lee,Myoungho Sunwoo,Seungwoo Lee,Chunwoo Lee,Wootae Kim 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The Variable Valve Timing (VVT) system for high performance has become a key technology used in newly developed engines. In this paper, model-based control is proposed to make a fast and precise VVT control system that has robustness to manufacturing tolerances and aging. The VVT system is modeled by a third-order nonlinear state equation, which in particular accounts for nonlinearities of the system. Based on the model, a controller is designed for position control of the VVT system. The sliding mode theory is applied to controller design in order to overcome model uncertainties and unknown disturbances. The experimental results suggest that the proposed sliding mode controller is capable of improving the tracking precision. In addition, the proposed controller seems to be robust against change in magnitude of the cam timing inputs.
동기 발전기 등가회로를 이용한 얼터네이터 토크 모델 설계
손정원(Jeongwon Sohn),홍승우(Seungwoo Hong),이현준(Hyunjun Lee),이주원(Joowon Lee),이민광(Minkwang Lee),선우명호(Myoungho Sunwoo) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
This paper presents the alternator torque model derived from an equivalent circuit of synchronous generator. The model is designed to simulate the automotive alternator operated on various conditions. It reflects the torque variation mainly caused by dynamic characteristics such as engine speed, load current, and target voltage. The alternator torque works as the engine load directly, thus the model can be used for the establishment of energy management strategies. In this paper, a research case of the alternator generation control is introduced to validate a model application. The simulation result shows the model is applicable for the variety of energy management researches.