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하이브리드 전기자동차의 운전조건에 따른 제어 특성 연구
여운석(Unseuk Yeo),류정인(Jeongin Ryu),김강출(Gangchul Kim),이영재(Youngjae Lee) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Hybrid electric vehicles (HEVs) combine the internal combustion engine and the electric motor generator with battery system, resulting in improved fuel economy and lower exhaust emissions compared to conventional vehicles. In the present study, HEV control characteristics are analyzed for the Toyota Prius. To accomplish this, vehicle speed, engine speed, battery current and voltage, SOC(State of Charge), motor speed and torque, generator speed and torque, and engine coolant temperature etc. are measured in real time. Tests are carried out on chassis dynamometer and on-road driving under various test conditions such as different initial SOC(SOC 40%, SOC 56%, and SOC 80%) and different driving patterns.<br/>
소형 고속 연료분사 엔진의 SCV 이용 저속성능향상 연구
이승진(Seungjin Lee),류정인(Jeongin Ryu),조규백(Gyubaek Cho),최교남(Kyonam Choi),정동수(Dongsoo Jeong) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Fuel injection system has more benefits in power, fuel consumption and emission than carburetor system even in high speed small engine. Up to date fuel injection system and SCV is used in motor car but is not used in motorcycles in Korea. Fuel injection system which has ECM can control precise fuel supply to variable rpm in engine and SCV is possible to increase engine performance at low rpm. The purpose of this study is the investigation of effects of fuel injection system and SCV to improve the engine performance and efficiency in variable revolution of high speed small engine which is 4 Valves SOHC single cylinder engine used in motorcycle.
이승진(Seungjin Lee),류정인(Jeongin Ryu),최수진(Sujin Choi),최교남(Kyonam Choi),정동수(Dongsoo Jeong) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
As an engine has a wide range of rpm and loud, variable control system is necessary in order to increase engine performance. SCV has been frequently referred to as a possible way to increase engine performance at low rpm. The purpose of this study is.<br/> to investigate the influence of SCV, specially at the range of lower rpm, in a high-speed small engine. Experiments were conducted on 4Valves SOHC/air-cooling single cylinder engine and various SCV shapes have been tested and investigated for the performance of power, fuel consumption and emission.
소형 가솔린 엔진의 VVT적용을 위한 엔진 성능 기초 연구
이승진(Seungjin Lee),류정인(Jeongin Ryu),최교남(Kyonam Choi),이용규(Yonggyu Lee),정동수(Dongsoo Jeong) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Due to wider operation engine speed range, from 3000 to 12,000 rpm, in small gasoline engine, EFI(Electronic fuel injection) with ECU and VVT (Variable Valve Timing) systems are necessary in order to increase engine performance. In Korea, both system are already adopted in automotive engines but are not in the engine for motorcycle. In this study, to check the applicability of VVT, various cams with different valve timings are tested in small single cylinder gasoline engines with EFI system. In oder to optimize valve timing with engine speed, intake valve opening timing is changed by every 5 CA deg with commercial cam. Compared to conventional valve timing in 4 valve SOHC single cylinder engine, 12% increase of engine power was obtained at low engine speed with 15° advanced IVO(intake valve opening) and 7% increase at high engine speed with 5° retarded IVO.
마이크로 열병합발전용 10kW급 천연가스엔진의 성능 최적화
이창준(Changjun Lee),류정인(Jeongin Ryu),오시덕(Sideok Oh),표영덕(Youngdug Pyo),이영재(Youngjae Lee) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Cogeneration is an energy conversion process, where electricity and useful heat are produced simultaneously in one process. Also, carbon dioxide emissions can be reduced as well. The cogeneration process may be based on the use of steam, gas turbines or combustion engines. However, there have been few models with an output of less than 100 kilowatt. In the present study, a spark ignited gas engine with generation output of 10 kilowatts was developed for micro cogeneration package. The gas engine shows 29.2% of thermal efficiency under Stoichiometric combustion and 33.6% of thermal efficiency under lean combustion. NOx emission shows less than 10ppm at 13% oxygen under stoichiometric combustion and about<br/> 100ppm at 13% oxygen under lean combustion.