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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.
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.
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.
DC 모터방식 EGR 밸브를 적용한 승용디젤엔진의 앞먹임 공기량 제어에 관한 연구
오병걸(Byounggl Oh),이민광(Minkwang Lee),박영섭(Yeongseop Park),이강윤(Kangyoon Lee),선우명호(Myoungho Sunwoo),남기훈(Kihoon Nam),조성환(Sunghwan Cho) 한국자동차공학회 2011 한국 자동차공학회논문집 Vol.19 No.5
In diesel engines, accurate EGR control is important due to its effect on nitrogen oxide and particulate matter emissions. Conventional EGR control system comprises a PI feedback controller for tracking target air mass flow and a feedforward controller for fast response. Physically, the EGR flow is affected by EGR valve lift and thermodynamic properties of the EGR path, such as pressures and temperatures. However, the conventional feedforward control output is indirectly derived from engine operating conditions, such as engine rotational speed and fuel injection quantity. Accordingly, the conventional feedforward control action counteracts the feedback controller in certain operating conditions. In order to improve this disadvantage, in this study, we proposed feedforward EGR control algorithm based on a physical model of the EGR system. The proposed EGR control strategy was validated with a 3.0 liter common rail direct injection diesel engine equipped with a DC motor type EGR valve.
Cylinder Deactivation 엔진의 동작모드 전환 시 과도상태 공연비 제어
권민수(Minsu Kwon),이민광(Minkwang Lee),김준수(Junsoo Kim),선우명호(Myoungho Sunwoo) 한국자동차공학회 2011 한국 자동차공학회논문집 Vol.19 No.2
Hybrid powertrain systems have been developed to improve the fuel efficiency of internal combustion engines. In the case of a parallel hybrid powertrain system, an engine and a motor are directly coupled. Because of the hardware configuration of the parallel hybrid system, friction and the pumping losses of internal combustion engines always exists. Such losses are the primary factors that result in the deterioration of fuel efficiency in the parallel-type hybrid powertrain system. In particular, the engine operates as a power consumption device during the fuel-cut condition. In order to improve the fuel efficiency for the parallel-type hybrid system, cylinder deactivation (CDA) technology was developed. Cylinder deactivation technology can improve fuel efficiency by reducing pumping losses during the fuel-cut driving condition. In a CDA engine, there are two operating modes: a CDA mode and an SI mode according to the vehicle operating condition. However, during the mode change from CDA to SI, a serious fluctuation of the air-fuel ratio can occur without adequate control. In this study, an air-fuel ratio control algorithm during the mode transition from CDA to SI was proposed. The control algorithm was developed based on the mean value CDA engine model. Finally, the performance of the control algorithm was validated by various engine experiments.
최두원(Doowon Choe),이민광(Minkwang Lee),선우명호(Myoungho Sunwoo) 한국자동차공학회 2008 한국 자동차공학회논문집 Vol.16 No.4
Gasoline Homogeneous Charge Compression Ignition (HCCI) combustion is a new combustion concept. Unlike the conventional internal combustion engine, the premixed fuel mixture with high residual gas rate is auto-ignited and burned without flame propagation. There are several operating factors which affect HCCI combustion such as start of combustion (SOC), residual gas fraction, engine rpm, etc. Among these factors SOC is a critical factor in the combustion because it affects exhaust gas emissions, engine power, fuel economy and combustion characteristics. Therefore SOC of gasoline HCCI should be controlled precisely, and SOC detection should be preceded SOC control. This paper presents a control oriented SOC detection method using 50 percent normalized difference pressure. Normalized difference pressure is defined as the normalized value of difference pressure and difference pressure is difference between the in-cylinder firing pressure and the motoring pressure. These methods were verified through the HCCI combustion experiments. The SOC detection method using difference pressure provides a fast and precise SOC detection.
가솔린 엔진의 흡기밸브 리프트 변화에 따른 개별실린더 당량비 추정 및 제어 알고리즘에 관한 연구
김준수(Junsoo Kim),오승석(Seungsuk Oh),이민광(Minkwang Lee),선우명호(Myoungho Sunwoo) 한국자동차공학회 2011 한국 자동차공학회논문집 Vol.19 No.5
In a spark ignition engine, a variable valve lift (VVL) system has been developed for high fuel efficiency and low power loss. However, changes in valve lift cause deviations of cylinder air charge which lead to individual cylinder equivalence ratio maldistribution. In this study, in order to reduce the maldistribution, we propose individual cylinder equivalence ratio estimation and control algorithms. The estimation algorithm calculates the equivalence ratio of each cylinder by using a mathematical engine model which includes air charging, fuel film, exhaust gas, and universal exhaust gas oxygen sensor (UEGO) dynamics at various valve lifts. Based on the results of estimated equivalence ratio, the injection quantity of each cylinder is adjusted to control the individual cylinder equivalence ratio. Estimation and control performance are validated by engine experiments. Experimental results represented that the equivalence ratio maldistribution and variation are decreased by the proposed algorithms.