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차준표,박준홍,이형욱,전문수 한국자동차공학회 2021 International journal of automotive technology Vol.22 No.3
The objective in present study is to develop a regression analysis model to estimate real-world CO2 emissions of light-duty diesel vehicles considering domestic road conditions. For regression analysis variables, OBD data such as vehicle speed, acceleration, engine speed (rpm), and engine power were used. Regression analysis results were compared with CO2 emissions measured using PEMS on the test routes of the real driving emissions-light duty vehicles (RDE-LDV). In results, the vehicle speed and air/fuel data from the OBD signals maintained a linear relationship with the GPS and exhaust gas flowmeter-based vehicle speed and exhaust flow data. All determination coefficients were ≥0.99, indicating that the OBD data provided by the test vehicle in this study exhibited strong reliability. To investigate the accuracy of the regression equation estimated using the trip variables of the OBD data, the driving variables were substituted into the equation to obtain CO2 estimations and the real CO2 emissions measured using PEMS were compared. A strong linear relationship was observed between the regression equation-based CO2 estimations and real CO2 measurements. The determination coefficient was approximately 0.93, supporting the reliability of the estimation results.
차준표,유영수,이동인,전문수 한국분무공학회 2017 한국액체미립화학회지 Vol.22 No.4
In order to improve the quality of air in urban areas, the emission regulations are being strengthened by the government. The on-road test of light-duty vehicles was started with PEMS because certification test mode does not sufficiently reflect on-road conditions. Therefore, The PEMS-based test was implemented from Sep. 2017 in Europe and Korea. However, this is lack of data on various on-road patterns in Korea. The purpose of the present study has analyzed the effect of speed per acceleration and acceleration on NOx emission on-road driving. The test route consisted of urban, rural, and motorway in Seoul. This study has been conducted by Euro-6 vehicles using on SCR system with PEMS. The on-road emission charac-teristics were evaluated by moving averaging windows (MAW) method. In results, RDE-NOx by severe driving pattern has been 1.4 times higher than soft driving pattern NIER Route 1.
디젤엔진에서 DME-바이오디젤 혼합연료의 분무 및 배기 특성에 관한 연구
차준표(Junepyo Cha),박수한(Su Han Park),이창식(Chang Sik Lee),박성욱(Sung Wook Park) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
본 연구는 DME-바이오디젤 혼합연료의 분무 및 연소, 배기 특성을 바이오디젤과 비교한 실험적 연구이며 실험연료는 바이오디젤 (BD100)과 중량 기준으로 DME를 20% 혼합한 DME-바이오디젤 혼합연료 (B-DME20)이다. 거시적 분무 특성을 연구하기 위하여 분무 이미지로부터 분무도달거리, 분무각을 측정하였으며, 연소 및 배기 특성은 단기통 직접 분사식 압축착화 기관을 이용하여 분석하였다. 실험결과 바이오디젤과 DME-바이오디젤 혼합연료는 분사율에서는 큰 차이가 없었지만 혼합연료의 경우에 착화지연기간이 짧고 연소압력이 높았으며 soot 배출물이 현저하게 줄어들었다. The purpose of the present work is to investigate the spray atomization, combustion and emissions characteristics of biodiesel-DME blended fuels compared to a pure biodiesel fuel derived from soybean. The test fuel was a pure biodiesel (BD100) and a blended fuel (B-DME20) which was added DME by 20 % mass based fraction into biodiesel. For studying the overall spray characteristics, the spray tip penetration, spray cone angle were analyzed from the spray images. In addition, combustion and exhaust emissions characteristics were studied using a single-cylinder DI compression ignition engine with a common-rail injection system. The experimental results showed that blended fuel had shorter ignition delay and higher combustion pressure compared to those of biodiesel although both fuels indicated similar trends in injection rate for the same injection pressures. Furthermore, the blended fuel significantly reduced soot emissions.
바이오디젤을 적용한 압축착화 엔진에서 EGR율에 따른 연소 및 미세입자 배출물 특성
차준표(Junepyo Cha),윤승현(Seung Hyun Yoon),박성욱(Sung Wook Park),이창식(Chang Sik Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
An experimental investigation was conducted to analyze the effects of EGR ratio on the combustion, exhaust emissions characteristics and size distributions of particulate matter in a single cylinder diesel engine with common-rail injection system. In order to analyze the combustion, exhaust emissions and measurement of size distributions of particulate matter were carried out under various EGR ratio which was varied from 20~60% and the results were compared to those of results without EGR. The experimental results show that ignition delay was extended and maximum value of ROHR was decreased according to increasing of EGR ratio. In addition, increasing of EGR ratio reduced oxidies of nitrogen (NOx) but soot emissions increased. However, under high EGR ratio region, particulate matter was slightly decreased.