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순수 DME의 직접분사식 디젤기관의 성능 및 배기가스 특성
표영덕,이영재,김강출,김문헌,Pyo, Young-Dug,Lee, Young-Jae,Kim, Gang-Chul,Kim, Mun-Heon 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.5
DME(Dimethyl ether) is an oxygenated fuel with a octane number higher than that of diesel oil. It meets the ULEV emission regulation and reduces the smoke to almost zero when used in a diesel engine. In the present study, engine performance and exhaust emissions were investigated with a conventional DI diesel engine which has a jerk type injection pump. Test results showed that the power with DME were almost same as that of pure diesel oil, and the brake thermal efficiency increased a little. Also, smoke index from DME engine showed nearly zero level, but NO$_{x}$ was increased compare to diesel oil.
길범수(Bum Soo Kil),김강출(Gang Chul Kim) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.5
최근 지구환경에 대한 전 세계적인 관심증가에 따른 친환경 이동수단에 대한 수요가 늘고 있다. 휘발유를 에너지원으로 하는 내연기관 이륜차의 경우 소음 공해와 배기가스 배출로 인해 국제적으로 전기이륜차로의 보급을 추진하고 있다. 이에 정확한 전기이륜차 성능평가의 필요성이 증가하고 있다. 전기이륜차의 성능을 평가하는 방법은 도로에서 주행 시험하는 방법과 실내에서 차대동력계를 이용한 시험방법이 있다. 차대동력계는 전기이륜차가 도로에서 주행하는데 받는 주행 저항을 전기모터에 의해 재현시켜 준다. 이때 도로부하 설정은 차대동력계에 의한 시험의 결과에 영향을 준다. 본 논문에서는 차대동력계를 이용한 성능평가의 중요한 설정 값인 도로부하 설정에 대한 방법인 테이블법과 타력주행시험에 의한 도로부하 설정의 차이에 대해 비교 분석하였다. Recently, the demand of environmentally friendly transportation has increased due to the environmental issues. Electric two-wheeled vehicles do not have the noise pollution nor exhaust gases of vehicles with internal combustion engines. Performance evaluation of an electric two-wheeled vehicle was carried out. A driving test on outdoor roads was performed and a chassis dynamometer was used. The chassis dynamometer simulates the road load of the vehicle. The road load influences the tests using the chassis dynamometer. The differences between the table method and the coasting test for setting the road load was compared and analyzed.
세라믹 리니어엔진을 이용한 소형 전기자동차용 온보드 제너레이터 개발
김남열(Nam Yuer Kim),표영덕(Young Dug Pyo),임옥택(Ock Taeck Lim),김강출(Gang Chul Kim) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
In the realm of small electric vehicles (neighborhood electric vehicles or personal electric vehicles such as electric wheelchairs, electric scooters etc.), there's a power struggle brewing. They demand lots of electrical power and long operation, but current rechargeable battery cannot provide the operational durations required. Also short lifetimes of batteries impose a fundamental limitation. Due to these reasons, a small linear reciprocating engine and linear electric generator are designed in this paper. If an engine is used solely to produce electrical power, it is not necessary to convert the reciprocating linear motion of the piston to rotary motion by crank. Instead, a linear electrical generator may be coupled directly to the piston for a conversion of mechanical energy into electrical energy. Such a design has many advantages such as mechanical simplicity and low friction and it can make possible a small engine having high efficiency. In other words, linear engines give power output more efficiently compared to conventional reciprocating piston engine, because it doesn't have a crank mechanism, hence there is less mechanical loss. In this study, we developed a small sized linear engine for the electrical power generation. To increase the efficiency and endurance, we made a piston and cylinder sleeve by ceramic materials.
휴대용 파워팩을 위한 소형 세라믹 리니어엔진 설계 및 동적 특성에 관한 연구
김남열(Nam Yuer Kim),김강출(Gang Chul Kim),하병길,임옥택(Ock Taeck Lim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Current rechargeable battery cannot provide high energy density and the operational durations required. But linear engine/generators provide high energy density for portable power applications because fuel is more high density. In this paper, we suggest that basic design of powerpack using linear engine for assisting power output. Efficiency is relatively high because linear engine don't have crank mechanism compared with rotary engine. We made prototype engine and had experiments to know moving characteristic about the Linear Engine. It was possible to operate velocity at 50 ㎐ at the firing and pressure in cylinder was 16bar.
주행모드에 따른 전기이륜차의 1회충전주행거리 시험방법에 관한 연구
길범수(Bum Soo Kil),김강출(Gang Chul Kim) 대한기계학회 2014 大韓機械學會論文集A Vol.38 No.1
본 연구에서는 전기이륜차의 1회충전주행거리를 알아보기 위해 도로 주행시험과 차대동력계(Chassis Dynamometer) 주행시험을 하였다. 도로주행시험은 대전시(Daejeon Metropolitan City)의 도로 중 대표적인 3가지 루트에서 주행시험을 하였다. 차대동력계를 이용한 CVS-40모드 주행시험의 경우 도로 부하조건을 다양하게 설정하여 CVS-40 모드주행을 실시하였다. 본 연구를 통하여 도로에서의 전기이륜차의 1회 충전주행거리(Per-Charge Range Testing)를 확인하고, 차대동력계 도로부하 설정방법에 따른 주행거리 및 에너지소비효율을 측정하였다. 이를 통해 실도로 주행시험과 차대동력계 주행시험을 비교하여, 차대동력계 실험에서도 전기이륜차 1회충전주행거리시험이 실도로에서의 주행조건과 근접한 결과를 갖는 도로부하 설정에 대해 연구하였다. For testing a two-wheeled vehicle"s per-charge range, this study conducted road and chassis dynamometer driving tests. Three typical road routes within Daejeon Metropolitan City were selected for the road-driving test. In the case of CVS-40 mode driving tests using a chassis dynamometer, various road-loading conditions were set. In this study, two-wheeled electric vehicles" per charge range on the road was confirmed through testing, and the range and energy consumption efficiency depending on various chassis dynamometer road load settings were measured. Then, the results of the actual road driving tests were compared with those of the chassis dynamometer driving tests, and road load settings that yielded per-charge range testing results similar to those under actual road driving conditions in the chassis dynamometer experiments were studied.