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재제조 디젤 엔진의 수소 가스 첨가에 따른 NEDC mode 평가
박범수(Bumsu Park),임태호(Taeho Lim),이준기(Junki Lee),서삼원(Samwon Seo),김용태(Yoongtae Kim) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
Recently, eco-friendly car with high fuel efficiency gets more attention than before and manufacturers are more focused on investigating in reducing discharge of harmful gas and enhancing higher fuel efficiency at the same time. However, the leading cause of air pollution and low fuel efficiency are superannuated cars already on the road, therefore, plans for reducing discharge of harmful gas and enhancing higher fuel efficiency for superannuated cars should be the first priority. This research implemented engine remanufacturing for reducing discharge of harmful gas and enhancing higher fuel efficiency for superannuated cars. To follow the new exhaust gas regulation, we also applied a technique of reducing discharge of harmful gas using hydrogen burning (reaction/feature). Addition of hydrogen (using PEME) increases lean-burn and burning efficiency due to its fast flame speed that act as prevention of reducing discharge of harmful gas. This experiment used NEDC mode for evaluation of certifying local diesel engines" fuel efficiency and discharging gases. As a result, adding small amount of hydrogen at intake valve increaaes burning efficiency that makes higher fuel efficiency and reduces discharge of harmful gas.
재제조 디젤 엔진의 수소 가스 첨가에 따른 NOx 배출 특성 평가
박범수(Bumsu Park),임태호(Taeho Lim),김창기(Changki Kim),서삼원(Samwon Seo),김용태(Yongtae Kim) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
Engine remanufacturing is a whole process of making an old, worn out engine into an almost new engine through disassembling, cleaning, examining, adjusting and reassembling. Engine remanufacturing could save production cost and prevent CO2 emission, but it hardly satisfies the new exhaust gas regulation. Especially in diesel engines, we need various investigations on reducing NOx emission. This research took NOx reducing technology using hydrogen burning (reaction). Addition of hydrogen (using PEME) could reduce NOx emission because it creates fast flame spread that helps decreasing high temperature area of a cylinder. Condition of the experiment was engine load of 25%, 50%, 75%, and 100% each, and engine speed of 1200 RPM, 1600 RPM, 2000 RPM, 2400 RPM, and 2800 RPM. In this experiment we compared each condition focusing on different features of NOx emission. As a result, adding slight amount of hydrogen to intake valve made it tiny worse NOx emission at low engine load. And at middle engine load, hydrogen addition was effective in reducing NOx emission. Finally, at high engine load, we found it hydrogen addition is not effective in reducing NOx emission.
Dual-Loop EGR을 적용한 승용 디젤 엔진의 NO<SUB>x</SUB> 배출 특성에 관한 실험적 연구
이준우(Joonwoo Lee),박범수(Bumsu Park),박상수(Sangsoo Park),박경희(Kyunghee Park),이창언(Chang-eon Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Dual Loop-EGR is composed of High Pressure Loop(HPL) EGR and Low Pressure Loop(LPL) EGR. While HPL-EGR has difficulties in supplying sufficient amount of EGR, LPL-EGR facilitates the supply of a large amount of EGR using pressure difference by providing recirculated exhaust as an inhaled gas from the rear part of exhaust aftertreatment device such as DPF. Because the temperature of the rear part of DPF is lower than the temperature of the front part of turbine, the size of EGR Cooler can be made with a smaller size. On the other hand, because LPL-EGR has low response rate due to an extended recirculation pipe length, it is hard to be applied to light duty diesel engine which is mainly used in excessive driving condition. Therefore, the basic concept of Dual-Loop EGR is to achieve high response rate and high EGR rate according to driving condition by using HPL-EGR which has high response rate in speed changing section and LPL-EGR which has low response rate in constant speed section. In this research, Dual Loop-EGR system was constructed by adding LPL-EGR and back pressure device to HPL-EGR-applied light duty diesel engine. NOx displacement was measured after each of HPL, LPL-EGR and Dual Loop-EGR was applied in certain revolutions and loading conditions. Optimal fraction of Dual Loop-EGR was analyzed during this procedure. Also, general research about Dual Loop-EGR was performed by measuring changes in the amount of fuel consumed.
이민규(Lee Minkyu),정재윤(Jung Jaeyun),고대건(Ko Daegun),박범수(Park Bumsu),최정훈(Choi Jeonghoon),한혜승(Han Hyeseung),김경주(Kim KyoungJoo),김현섭(Kim Hyunsup),김성규(Kim Sungkyu) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.11
Recently, as electric vehicle technology has become more advanced, V2G (vehicle to grid) technology that uses batteries externally is being commercialized, and is divided into V2H (vehicle to home) and V2B (vehicle to building) depending on the type of grid connection. V2B services have a profit effect by discharging EV energy into the building when the building load is high, maintaining or lowering the buildings base rate, and for this purpose, accurate building load prediction is important. In this study, the results predicted by linear statistical models and nonlinear machine learning models were corrected with a multi-layer perceptron to derive the final results, and were evaluated using one years worth of actual load data on buildings.