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LPG/CNG Bi-fuel 차량의 실도로 모사 가상 주행사이클을 이용한 CO₂ 배출량 분석
이범호(Beomho Lee),오광철(Kwangcheol Oh),김덕진(Deokjin Kim) 한국자동차공학회 2019 한국 자동차공학회논문집 Vol.27 No.6
Many studies have been conducted of late on the performance optimization of vehicles using the synthetic driving cycle, by reflecting the driving characteristics of the real road. To evaluate the CO₂ reduction performance in the actual road driving conditions of the LPG/CNG-bifuel vehicle developed for the domestic taxis, the driving characteristics of the domestic taxis were analyzed. Simulated real-world driving cycles reflecting normal, mild, and severe driving characteristics were developed using the Markov chain, which can predict the speed profile through a statistical method with minimal driving data. The CO₂ emissions of the LPG/CNG-bifuel vehicle were measured during the vehicle chassis dynamometer testing over the developed synthetic cycles and certification standard cycles, and the correlation between the driving characteristics and the CO₂ emissions was analyzed. The CO₂ emissions were found to be highly correlated with the RPA of the driving cycles, and the CNG fuel mode showed a 13.7 % CO₂ emission reduction compared to the LPG fuel mode under real driving conditions.
기체분사 LPG 연료공급시스템을 위한 저차압 타르휠터 개발
이범호(Beomho Lee),조승환(Seunghwan Cho),이대엽(Daeyup Lee),최윤재(Yoonjae Cho),서진수(Jinsoo Seo) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Unsaturated hydrocarbons in domestic LPG fuel for vehicles form tar when vaporized. A LPG fuel also reacts with rubbers in the fuel supply system and forms tar. Tar is also formed by contaminants such as grease and compressor oil in LPG. In order to develop a tar filter, tar was collected from vehicle’s fuel supply system and analyze to investigate its composition. A reference tar consisting of Di-Octyl Phthalate, 2-(Methyl Amino)Ethanol and Methyl Palmitate, which represent the primary three components resulting, respectively, from the main sources of tar formation, was made. Tar filtration characteristics, through a basic study of tar vaporization and filtration test, were measured. And, a filtration media, using pressure drop and filtration performance test, was developed. A filter structure with low pressure resistance was deigned by numerical analysis. A prototype tar filter was developed, and its performance and pressure drop across were measured using engine as well as rig. The experimental results were compared with that of numerical. This study concludes that a tar filter for LPG gaseous injection system satisfying about 2kPa pressure drop across at WOT has been successfully developed.
대량 주행 데이터 분석을 통한 소형 경유차의 NOx 배출특성 연구
이범호(Beomho Lee),윤보섭(Boseop Yun),정재우(Jaewoo Jung),김덕진(Deokjin Kim),차우섭(Woosub Cha),이상운(Sangwoon Lee),김인구(Ingu Kim) 한국자동차공학회 2018 한국 자동차공학회논문집 Vol.26 No.5
The introduction of the RDE(Real Driving Emissions) regulation of diesel vehicles has raised interest in emission characteristics on real roads and the operating characteristics of after-treatment systems, but there have been many restrictions on obtaining long-term driving and exhaust emission data in real road conditions that use PEMS (Portable Emission Measurement System). In this study, a SPEMS(Sensor-based Portable Emission Measurement System) was developed so it could efficiently acquire long-term driving and emission data by using the NOx sensor for an OBD system. It was installed in four vehicles that adhere to Euro 4-6 emission regulations to generate massive data under normal operating conditions in an actual road. The mean and MAW analysis results of the NOx emissions that were measured under long-term normal operating conditions have been found as highly correlated with the RDE test results performed on regulated driving routes with PEMS for certification. Furthermore, in the SCR applied to Euro-6 vehicles, the reduction efficiency of SCR decreased as the ambient temperature was about 5 °C or less, and the reduction efficiency was drastically lesser at the catalyst inlet temperature of 250 °C or less.
승용차용 타이어의 회전저항계수 변화에 따른 주행저항 및 연비 영향 분석
이범호(Beomho Lee),김덕진(Deokjin Kim),이진우(Jinwoo Lee),차우섭(Woosub Cha),서영호(Youngho Seo) 한국자동차공학회 2018 한국 자동차공학회논문집 Vol.26 No.6
The rolling resistance of tires is a major factor that affects the fuel efficiency of vehicles, and it generally uses low rolling resistance tires to improve fuel economy by an average of 2.4 %. This study measured the rolling resistance coefficient of 12 types of tires, and measured the change in fuel economy and CO₂ emissions by setting the rolling resistance of a tire in five steps, thereby referring to the tyre efficiency labelling program. Three types of driving resistance were derived in a coast-down experimental test and two types were derived through a simulation for rolling resistance coefficient in five steps, and the fuel economy was compared to the driving resistance produced on the chassis dynamometer. As the rolling resistance coefficient of the tire varies by 1 N/kN, the road load changed by 10.8 N, with a change in fuel economy by 1.9 % and CO₂ emissions by 1.97 %.
LPG액상 분사 연료공급 시스템에서 얼음형성과 혼합기의 온도 저하
이범호(Beomho Lee),성범모(Beommo Seong),조승환(Seunghwan Cho),이대엽(Daeyup Lee) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Development of an LPG fuel supply system with liquid injection technology is very promising for reducing the exhaust emission to meet the stringent emission regulations, and to enhance the engine performance. When an LPG fuel is injected, due to its large heat of vaporization the temperature of an injector's tip decreases significantly, which causes an icing phenomenon. In this work, a thermodynamic model was developed to understand the icing phenomenon with the LPLi(Liquid phase LPG injection) fuel supply system.
TMED 형식 HEV의 트립당 CO₂ 배출량 예측 모델 개발
이범호(Beomho Lee),정재우(Jaewoo Chung),이시원(Siwon Lee),김덕진(Deokjin Kim) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
최근 하이브리드 자동차는 중요한 친환자동차로 자리 잡았다. 이에 따라, 기존의 내연기관차량 뿐 아니라, 하이브리드차의 실제도로 주행 중의 CO<SUB>2</SUB> 배출 특성 분석은 운행차량의 배출가스 관리와 향후 하이브리드차의 성능 개선 기술 적용을 위해 필요하다. 특히, 하이브리드 자동차의 2개 동력원을 사용하는 구조적 특징에 기반하여, 특정 구간에서의 의도적인 엔진 작동 제한 및 도로주행 정보 적용 효율성이 매우 큰 기술적 특징을 가진다. 이러한 기술 적용을 위해서는 교통 특성이 고려되어야 할 필요가 있으며, 그간 대부분의 자동차 주행 특성 및 성능 분석은 매우 세밀한 시뮬레이션 기술을 바탕으로 하므로, 대량의 주행 DB을 활용한 운행 차 관리 및 다수 차량의 주행 특성 분석에는 어려움이 존재한다. 이에 본 연구에서는 대량의 주행 DB를 활용하여 TMED 방식의 HEV의 권역내 CO<SUB>2</SUB>배출량 산정 또는 실제 도로환경에서의 에너지 breakdown을 수행하기 위한 계산과정의 개발을 목표로 한다. 따라서, 실제 주행 중의 차량의 CO<SUB>2</SUB> 배출 성능과 환경 조건 그리고 동력시스템의 분석이 수행되며, 이를 이용한 기본적인 동력시스템의 작동인자의 이해를 수행한다. 본 연구의 Trip 기준 계산은 기존의 차량 모델링과 같이 세부 차종의 세밀한 제원을 활용하지 않으며, 원리적 개념에 의한 가정과 제한된 필수 입력항목을 바탕으로 비교적 간단한 계산에 의한 성능 예측이 가능하도록 구성되었으며, 이의 실험결과와의 비교를 통한 검증이 수행되었다.