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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.
김백유(Baekyu Kim),이기상(Kisang Lee),김연호(Yeonho Kim),김완수,Kyungha Kim 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
This paper presents the mathematic governing the load and no-load related losses in HMC multi-mode hybrid transmission. The losses of either each component or transmission system contain only mechanical those of it not electrical. The losses of each component are developed as functions or equations based on published information as well as empirical test data and total loss of the transmission system are evaluated under each input conditions such as different input torque, speed, and ATF temperature. The evaluated total losses in each transmission operating mode are examined with empirical no-load test data in order to validate the theoretical approach.
조형준(HyoungJun Cho),문상훈(SangHoon Moon),김기남(KiNam Kim),이기상(KiSang Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Interior permanent magnet synchronous motor (IPMSM) is widely and mainly applied for the traction motor in the hybrid electric vehicle (HEV) due to high efficiency, high power density and wide speed range. HEV traction motor design must correspond ultimately in fuel efficiency improvement goal of the vehicle, and that is achieved by high efficiency performance at the most frequently used area during vehicle hybrid operation control strategy. In this paper design related to increase of power density and efficiency at most frequently used area of IPMSM is presented.
PI(Power Integrity)해석을 통한 HPCU (Hybrid Power Control Unit) 전자파 성능 향상
김성규(Sungkyu Kim),정태환(Taehwan Chung),정진환(Jinhwan Jung),이기상(Kisang Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Power Integrity(PI) means a quality of the power and ground planes in an electric circuit board. This is closely bound up with the EMC performance of the circuit board. The electric potential actually fluctuates because of the influx of return-current circulating in the power and ground planes, which causes abnormal signals or EMC problems. This paper suggests a practical PI simulation method for analyzing EMC performance in design stage. With using this method, a proper countermeasure for any EMC problem can be taken before manufacturing an electric circuit board
김범식(Bumsik Kim),장지훈(Jihoon Jang),정진환(Jinhwan Jung),이기상(Kisang Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Permanent-magnet Synchronous Motors (PMSMs) are suitable for the Hybrid Electric Vehicle (HEV) due to their high efficiency and torque/power density. Since the torque of a PMSM is determined by the stator currents, stator current control is essential in the torque control. Also, available torque of a PMSM is dependent on the dc-link voltage of the inverter and motor speed. This paper investigates the current reference generation methods and proposes a new current reference generation method based on the two-dimensional tables. The proposed method has simple structure and reflects the motor speed as well as the dc-link voltage variation.
배터리 전압변동을 고려한 HEV용 모터시스템 효율 향상기법
김범식(Bumsik Kim),곽무신(Mushin Kwak),이영국(Youngkook Lee),정진환(Jinhwan Jung),이기상(Kisang Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Permanent-magnet Synchronous Motors (PMSMs) are suitable for the Hybrid Electric Vehicle (HEV) due to their high efficiency and torque/power density. Since the torque of a PMSM is determined by the stator currents, stator current control is essential in the torque control. Also, available torque of a PMSM is dependent on motor speed and battery voltage (dc-link voltage of the inverter). In this paper, a new current reference generation method is proposed, which can increase the system efficiency with high control accuracy even when the battery voltage varies. The performance of the proposed method is verified with experimental results.