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유철호(Chulho Yu),조성환(Sunghwan Cho),김우태(Wootai Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Automobile makers in Japan and Europe are mass-producing and/or developing GDI engines to cope with the future CO₂ regulation in the European market and to respond to the customers’ demand of fuel economy. GDI engines have advantages of the higher full load torque in low and medium speed range and reduced fuel consumption in part load. However, the loss of fuel in the vehicle to cope with emission regulation should be minimized. Combustion in a GDI engine depends on each part of combustion system components. Each part includes a piston bowl shape, split wall position in the intake port, injector installation angle, and so on. The methodology to optimize the combustion system in GDI engines is described in this study, presenting representative test results.
가솔린엔진 대상 성능시험시의 노킹보정률을 사용한 엔진 수정토크의 편차개선
조윤호(Yoonho Cho),김용옥(Yongok Kim),이춘우(Chunwoo Lee),김우태(Wootai Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recent trends of development in small size gasoline engines are both to have higher compression ratio for the purpose of improved fuel consumption and to advance spark timing up to DBL in a low to mid engine speed region for a good acceleration performance of vehicles. However, there occurs the deviation of corrected engine torque results during engine performance test on dynamometer because test conditions influence the onset of knock. Therefore, this research shows the test deviation of corrected engine torque decreases when knock correction rate is used.
흡배기 밸브타이밍이 가솔린엔진의 부분부하 성능에 미치는 영향
이원근(Wongeun Lee),한봉훈(Bonghoon Han),김우태(Wootai Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The potential benefit of dual CVVT was investigated by changing the exhaust valve timing in an intake CVVT engine. Intake/exhaust valve timing affects greatly on the part load performance by the combined effect of increased overlap, late intake valve closing timing, and park load knocking tendency. Pumping loss was reduced more effectively by exhaust cam phasing than intake can phasing. It is shown that there are many additional benefits of both intake/exhaust cam phasing over intake cam phasing only. Brake specific fuel consumption level was improved by about 2%, and addition reduction of about 30% in NOx emission was observed due to increased internal exhaust gas recirculation. Some potential reduction of hydrocarbon emission was also observed.
고점화 에너지가 스파크 점화기관의 연소에 미치는 영향에 관한 연구
송정훈(Jeonghoon Song),한만배(Manbae Han),선우명호(Myoungho Sunwoo),김우태(Wootai Kim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_2
A four-stroke-cycle engine was tested with an inductive coil ignition system capable of supplying up to 4 times the normal spark energy to the plug. The purpose of this study was to determine if higher ignition energies were beneficial in lowering the engine hydrocarbon emissions during low load operation and to compare high energy ignition systems with the Bosch ignition system.
가솔린 엔진에서 연료분사 압력이 천이운전시 배출가스 특성에 미치는 영향
이형민(Hyungmin Lee),명차리(Cha-Lee Myung),박심수(Simsoo Park),임혁(Hyuk Im),한승국(Seung Kook Han),김우태(Wootai Kim) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This work was investigated time resolved emissions behavior such as THC, NOx, and smoke emitted from tail-pipe on CVVT gasoline engine under fast transient operation with different fuel injection pressures. Transient operation type was simulated into very fast transient considering acceleration, steady, deceleration with automatically controlled servo motor which is coupled to throttle valve. Simultaneously measuring emissions with fast response gas analyzer and high sensitivity opacimeter, various sensor and actuating signals of a gasoline engine were diagnosed to verify the emission formation mechanism during transient operation. Consequently, high pressure injection plays a major role in emissions reduction during transient operation.