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포스터 전시회 : HCCI엔진의 과급 조건에서 EGR영향에 대한 수치해석
오충환 ( Chung Hwan Oh ),임옥택 ( Ock Taek Lim ) 한국액체미립화학회 2013 한국액체미립화학회 학술강연회 논문집 Vol.2013 No.-
This study investigates the EGR effect under the condition of intake boost pressure on homogeneous charge compression ignition (HCCI) combustion engine using numerical methods. The calculations were carried out using a single-zone model included in CHEMIKN-PRO. The detailed chemical-kinetic mechanisms and thermodynamic parameters for n-heptane and iso-octane from Lawrence Livermore National Laboratory (LLNL) were used for this study. Because changes in combustion phasing can significantly affect thermal efficiency, CA50 was maintained at 365°CA(5°CAaTDC). The results show that the EGR increase, the heat release was reduced. So the maximum pressure rise rate and IMEP were reduced. The EGR addition under the condition of intake boost pressure was maintain the IMEP higher than only add EGR.
커먼레일 연료분사 시스템을 장착한 2.9 리터급 경량 DME 트럭의 연구 및 개발
정수진(Soo-Jin Jeong),오세두(Se-Doo Oh),이호길(Ho-Kil Lee),박정권(Jung-Kwon Park),이기수(Gee-Soo Lee),표영덕(Young-Dug Pyo),임옥택(Ock-Taek Lim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
In this study, the trucks(2.9-liter) have been developed to use DME as fuel, and performance test of the vehicle"s DME engine, power, emissions, fuel economy and vehicle aspects was conducted. For experiments, the fuel system(common-rail injectors and high-pressure pump included) and the engine control logic was developed, and ECU mapping was performed. In this way, put the diesel fuel in the DME engine, and injection quantity at the injectors were measured. As a result, the rail pressure from 40 ㎫ to approximately 65% increase compared to the base injector has been confirmed that. Also, the Inlet IMV of DME high-pressure fuel pump opens under normal conditions, the performance of prototype was evaluated. As a result, the pump discharge flow is 15.5 ㎏/h when the fuel rail pressure is 400rpm(40 ㎫), and the pump discharge flow is 92.1 ㎏/h when the fuel rail pressure is 2,000rpm(40 ㎫). The maximum value of full-load torque capability is 25.5 ㎏fm(based on 2,000 rpm), and more than 90% compared to the level of the diesel engine were obtained. The DME vehicle was developed in this study, 110 ㎞/h can drive to the stable, and calculated in accordance with the carbon-balance method of fuel consumptions is 5.7 ㎞/L.