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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.
디젤 엔진의 엔진 토크 제어를 위한 실시간 IMEP 추정 알고리즘 개발
정재성(Jaesung Chung),오승석(Seungsuk Oh),이민광(Minkwang Lee),선우명호(Myoungho Sunwoo) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The indicated mean effective pressure (IMEP) is an indicator which represents the engine torque directly from the in-cylinder pressure. However, the calculation of IMEP requires a large number of cylinder pressure data acquisition and long computation time. For this reason, an estimation method of IMEP with less number of cylinder pressure data acquisition and computation time is needed for real-time combustion control. In this study, we proposed the IMEP estimation algorithm using difference pressure. The difference pressure data during the expansion stroke is used to estimate the IMEP and defined the estimated IMEP value as IMEPdiff. The proposed IMEPdiff has high linear relationship with the real IMEP regardless of different engine operating conditions. Furthermore, the IMEPdiff method reduces the data acquisition of cylinder pressure by 75% and the computational load by 62% compared to the IMEP method which gives a great potential for the real-time estimation of IMEP.