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2기통 소형 터보가솔린엔진에서 배기 밸브 타이밍 제어에 따른 LIVC, EIVC 상태에서의 엔진 효율 영향
장진영,우영민,신영진,고아현,정용진,조종표,김강출,표영덕,한명훈,Jang, Jinyoung,Woo, Youngmin,Shin, Youngjin,Ko, Ahyun,Jung, Yongjin,Cho, Chongpyo,Kim, Gangchul,Pyo, Youngdug,Han, Myunghoon 한국분무공학회 2022 한국액체미립화학회지 Vol.27 No.3
This study examines whether engine fuel efficiency is improved by optimization of the exhaust valve timing in a state where the intake valve timing has been optimized in a small turbo gasoline engine that has intake cams and exhaust cams with fixed valve opening periods. When the exhaust valve is opened late, the expansion stroke is longer, and the efficiency can be improved. A 2-cylinder turbo gasoline engine with 0.8 liters of displacement and an MPI (Multi Point Injection) fuel system was used. The engine was operated at 1,500 and 3,000 rpm, and the load conditions included a partial load of 50 N·m and a high load of 70 N·m. Data was recorded as the exhaust valve timing was controlled, and this was used to calculate the efficiency of combustion using a heat release, the fuel conversion efficiency, and the pumping loss. Results and the hydrocarbon concentrations in the exhaust gas were compared for each condition. Experiment results confirmed that additional fuel efficiency improvements are possible through exhaust valve timing control at 1,500 rpm and 50 N·m. However, in other operating conditions, fuel efficiency improvements could not be obtained through exhaust valve timing control because cases where the pumping loss and fuel/air mixture slip increased when the exhaust valve timing changed and the fuel efficiency declined.
무부하조건의 액상분사 LPG 단기통 SI엔진에서 엔진 회전수 변화가 잔류가스율과 배기가스 변화에 미치는 영향
장진영(Jinyoung Jang),우영민(Youngmin Yoo),염기태(Kitae Yeom),박용국(Youngkug Park),배충식(Changsik Bae),신현동(Hyundong Shin) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
Residual gas fraction in engine cylinder affects engine performance, efficiency and emission characteristics. With high residual gas fractions, flame speed and maximum combustion temperature are decreased and these are deeply related with combustion stability especially at idle and NOx emission at relatively high engine load.<br/> In this work, the residual gas traction was calculated by engine simulation code, and which was validated by the experimental data (cylinder pressure and emissions) obtained from liquid injection LPG single cylinder spark ignition engine. A comparison between the results from experiments and computational calculation was made. Residual gas is generated at low engine speed and the larger pressure difference between the intake and exhaust port.
[연료 및 윤활유부문] 스파크 점화 기관에서 작동조건이 잔류가스율 변화에 미치는 영향
장진영(Jinyoung Jang),배충식(Choongsik Bae) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
Residual gas fraction in engine cylinder affects engine performance, efficiency and emission characteristics. Residual gas is generated by the lower engine speed and the larger pressure differe.11CC between the intake and exhaust port. In this research, a series of parametric studies was performed to investigate effect of engine operating conditions on residual gas fraction in cylinder. The numerica1 ca1culations provided indication of the residual gas generation in a wide range of conditions; Residual gas fraction increased with increasing valve overlap duration and decreasing engine rpm; effect of throttle open ratio on residual gas fraction seemed to be minimal. This study will be ex1ended further and validated with various experiments
Dimethyl Ether 예혼합 압축 착화 엔진에서 배기 가스 재순환의 영향
장진영(Jinyoung Jang),염기태(Kitae Yeom),배충식(Choongsik Bae) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The combustion and exhaust emission characteristics were investigated in an DME fueled HCCI engine with variable valve timing(VVT). The operation range of HCCI engine was limited by high combustion pressure and noise due to muli-point and spontaneous combustion. To avoid the engine damage and expand the operating range, the combustion phase and start of combustion were controlled by exhaust gas recirculation(EGR) and VVT. EGR rate was varied from 0 to 60% and intake valve open time was varied from -29 to 1 CAD ATDC and air excess ratio(λ) was varied from 2.1 to 3.0. Later auto-ignition timing and longer combustion duration was achieved by adding EGR. However, hydro carbon was increased higher EGR rate and carbon monoxide was increased at higher air excess ratio.
DME 예혼합 압축착화 엔진에서 질소와 이산화탄소의 영향
장진영(Jinyoung Jang),윤현숙(Hyeonsook Yoon),염기태(Kitae Yeom),배충식(Choongsik Bae) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The combustion and exhaust emission characteristics were investigated in an DME fueled HCCI engine. Carbon dioxide, nitrogen and mixed gas, which was composed of carbon dioxide and nitrogen, were used as control parameters of combustion and exhaust emission. As the oxygen concentration in induction air, which was occurred by Carbon dioxide, nitrogen and mixed gas, was reduced, the start of auto-ignition was retarded and the bum duration was extended due to obstruction of combustion and reduction of combustion temperature. Due to these fact, indicated mean effective pressure was increased and indicated combustion efficiency was decreased by Carbon dioxide, nitrogen and mixed gas. In case of exhaust emission, hydrocarbon and carbon monoxide was increased by reduction of oxygen concentration in induction air. Especially, partial burning was appeared at lower than about 18 % of oxygen concentration by supplying carbon dioxide. However it was overcome by intake air heating.