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디젤 엔진의 연비 향상을 위한 저압 배기재순환 시스템의 적용에 관한 연구
김용래(Yongrae Kim),이용규(Yonggyu Lee) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.12
디젤 엔진에서 저압 배기재순환 시스템의 적용을 통한 질소산화물 저감과 연비 향상에 관한 효과를 확인하였다. 엔진의 정상 상태 및 과도 상태에서 시험이 진행되었으며, 차량상사를 통한 NEDC 모드테스트를 위하여 별도의 제어로직도 개발되었다. 정상 상태의 시험결과에서 저압 배기재순환 시스템은 고압 배기재순환 시스템에 비하여 질소산화물 저감 및 연비 향상에 유리함을 확인하였고, NEDC 모드테스트 결과로부터 배출가스의 증가없이 연비를 향상시킬 수 있는 것으로 나타났다. LP(low pressure)-EGR system was investigated to evaluate its potential on fuel economy improvement and NOx emission reduction in a diesel engine. A diesel engine was tested for the evaluation of LP-EGR system at both of steady-state and transient test. For a transient test, control logic for LP-EGR valve operation was developed and a NEDC mode test was conducted by using a vehicle status simulation test. The steady-state results showed that LP-EGR system can reduce more NOx emission or fuel consumption comparing to the conventional HP(high pressure)-EGR. From the NEDC mode test, this LP-EGR system showed a possibility to improve fuel economy without a penalty of emissions.
김용래(Yongrae Kim),이경현(Kyeonghyeon Lee),민경덕(Kyoungdoug Min),이원근(Wongeun Lee),김홍집(Hongjip Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Simulation of CAI engine was conducted in an single cylinder engine which was modified for CAI combustion. Result of CFD calculation including a direct injection during underlap provided that the mixture concentration around intake valve close had a uniform distribution. A reduced chemical kinetic mechanism was used for gasoline fuel and initial conditions (EGR and temperature) were acquired from 1-D cycle simulation. The simulation results showed that CAI combustion was occurred at the temperature of 970 K ~ 1000 K and the pressure of around 15 bar. The EGR rate had an important role for high temperature mixture but the temperature in itself was more critical for the induction of CAI combustion. EGR and mixture temperature could be adjusted by an variation of valve lift and timing.
김용래(Yongrae Kim),김선엽(Seonyoeb Kim),최지선(Jisun Choi),박철웅(Chelwoong Park),최영(Young Choi) 한국자동차공학회 2021 한국자동차공학회 지부 학술대회 논문집 Vol.2021 No.5
In this study the possibility of hydrogen as a fuel in a small-sized two-stroke SI (Spark ignition) engine was investigated. For this purpose, experimental setup including an engine, a dynamometer, equipments for hydrogen and lubricant oil supply was prepared. And then preliminary experiments for the hydrogen-fueled engine combustion were conducted. In the case of hydrogen-fueled engines comparing to gasoline backfire occurs when the excess air ratio is lower than a specific value. This can cause engine power reduction and damage to the engine parts. The engine was controlled to operate at lean conditions to prevent backfire. Through the control of excess air ratio, the maximum engine brake power output of 3 kW was achieved in a 210 cc engine, while it was 6 kW in case of gasoline fuel.