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Work and speed based engine operation condition analysis for new european driving cycle (NEDC)
심범주,K. S. PARK,구준모,S. H. JIN 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.2
In order to evaluate fuel consumption and tailpipe emission of a vehicle, standard driving cycles are used to prescribe vehicle drivingcondition such as speed, gear shift, fluid temperature and so on. New european driving cycle (NEDC) has prevailed as the only drivingcycle for emission and fuel consumption while Federal Test Procedure 75(FTP-75) mode is used in the United States. In South Korea,NEDC is applied for emission certification and FTP-75 mode is used for fuel consumption of a vehicle powered by diesel engine. Becausethese driving cycles are mixed of static phase (cruising and idle) and transient phase (acceleration and deceleration), they need to betransformed to static engine operation condition so that optimization is possible using engine dynamometer for each representative engineoperation condition. This study set up two models to convert vehicle driving conditions to engine operation condition based on workwhich the engine should produce to follow the driving cycle and based on representative vehicle speed of NEDC. Accuracy of each modelwas compared with actual vehicle test result on a chassis dynamometer and the characteristics of each model were analyzed
LCD Module내 COF Bending에 따른 Lead Broken Failure의 개선
심범주,최열,이준신,Shim, Boum-Joo,Choi, Yeol,Yi, Jun-Sin 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.3
TCP(Tape Carrier Package), COG (Chip On Glass), COF(Chip On Film) are three methods for connecting LDI(LCD Driver IC) with LCD panels. Especially COF is growing its portion of market place because of low cost and fine pitch correspondence. But COF has a problem of the lead broken failure in LCD module process and the usage of customer. During PCB (Printed Circuit Board) bonding process, the mismatch of the coefficient of thermal expansion between PCB and D-IC makes stress-concentration in COF lead, and also D-IC bending process during module assembly process makes the level of stress in COF lead higher. As an affecting factors of lead-broken failure, the effects of SR(Solder Resister) coating on the COF lead, surface roughness and grain size of COF lead, PI(Polyimide) film thickness, lead width and the ACF(Anisotropic Conductive Film) overlap were studied, The optimization of these affecting manufacturing processes and materials were suggested and verified to prevent the lead-broken failure.
배기 가스 분석을 통한 DPF내 Soot의 산화 여부 판단을 위한 실험적 연구
심범주(Beomjoo Shim),박경석(Kyoungsuk Park),조규희(Kyuhee Jo),이형준(Hyeongjun Lee),박준수(Junsu Park) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
By high particulate matter(PM) reduction performance, diesel particulate filter(DPF) is applied to almost all of modern HSDI diesel engine. PM emitted from engine is consist of carbon based and non-carbon based material. Representative carbon based PM is soot. Non-carbon based PM is produced by wear of engine and exhaust component, combustion of lubrication oil and sulphur in fuel. Accumulation of these non-carbon based PM affects pressure difference of DPF and thus estimation of soot mass in DPF can be incorrect during normal and regeneration condition because of pressure difference deviation of clean DPFs and pressure difference caused by non-carbon based PM is different from that of caused by carbon based PM. This study suggests new methodology to estimate accumulated soot oxidation through exhaust gas analysis during regeneration. Results, more high accuracy of soot oxidation was obtained by analysis of relationship between fuel mass and concentration of carbon dioxide and oxygen.
단거리 타행 성능을 이용한 차량의 도로 부하 산출을 위한 실험적 연구
심범주(Beomjoo Shim),현영준(Youngjune Hyun),이창학(Changhak Lee),민병두(Byeongdu Min),박경석(Kyoungsuk Park) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
For almost all of test on a chassis dynamometer, road load which is imposed to the test vehicle when it is operating on real load should be reproduced by the test equipment. For this, actual road load of the test vehicle should be measured and coastdown test is one of the most frequently used method. The resistant forces can be drawn from vehicle speed and deceleration duration with the engine ungeared during free rolling under prescribed condition. To comply with the prescribed test condition, long straight and flat test road should be prepared as well as ambient condition in aspect of temperature, pressure, wind speed and humidity should be met. This test condition can be hardly met and thus considerable effort and time are required to obtain correct test results. This study is focused on a new methodology to calculate running resistance of a vehicle from segmentalized coastdown measurement in order to minimized the effect of road and ambient condition.
가변형 터보차저(VGT)적용 HSDI 디젤 엔진의 급감속시 서지(Surge) 개선을 위한 시험적 연구
심범주(Beomjoo Shim),박경석(Kyoungsuk Park),이창학(Changhak Lee),김인태(Intae Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Specific power output of modern HSDI diesel engine with common rail injection system has been increasing since it was applied to passenger car. With this market requirement and stringent emission / CO₂ regulation, Variable Geometry Turbine (VGT) is almost essential component for HSDI diesel engine replacing Waist Gate Turbine (WGT) in order to increase intake air charging capability and to decrease pumping loss. This high air charging performance of VGT, however, needs precise and prompt control to prevent compressor surge which can damage VGT itself and cause abnormal noise especially if intake throttle flap is applied to increase EGR rate or for Diesel Particulate Filter (DPF) regeneration control. This study describes Engine Management System (EMS) control strategy to prevent compressor surge during abrupt deceleration using interactive control method between VGT, EGR, intake throttle flap and fuel injection control minimizing effect on emission and vehicle dynamic performance. As indication of compressor surge during pedal-off phase, trace of intake air mass flow was evaluated under various intake throttle flap position, EGR valve opening and VGT vane position. Air mass flow of each case was evaluated by compressor characteristic map based on corrected air mass flow and compressor pressure ratio.
모터링시 캠과 크랭크 센서 신호 분석에 의한 기관의 압축 압력 균일도 분석
심범주(Beomjoo Shim),박경석(Kyoungsuk Park),김인태(Intae Kim),이형준(Hyungjun Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Compression pressure of individual cylinder has big influence on engine performance parameters such as combustion pressure, indicated mean effective pressure (IMEP), emission, vibration, combustion noise and many other combustion parameters. Conventional method to check compression pressure uniformity is done by mechanical pressure gage and this method needs to disassemble related parts such as glow or ignition plugs which causes cost and time. Also this conventional method causes inaccuracy of cylinder pressure measurement because of different cranking speed results mainly from battery status and lubrication oil temperature. This study describes and suggests new methodology to measure compression pressure by analysis of CAM and crank sensor signal during cranking with high accuracy but without mechanical pressure gage or parts disassemble. Results, it is found that leak of cylinder has linear relationship with crankshaft angular speed during compression stroke so that cylinder leak can be detected by CAM and crank signal.