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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.
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.
타행 성능 분석을 이용한 NEDC 모드의 엔진 운전 조건 분석
심범주(Beomjoo Shim),박경석(Kyoungsuk Park),박준수(Junsu Park),이형준(Hyungjun Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
For emission and fuel economy test, test vehicle should be installed on a chassis dynamometer and driven according to prescribed driving pattern such as New Euorpean Driving Cycle(NEDC) or Federal Test Procedure (FTP-75). Road load which is imposed to the test vehicle when it is operating on real load should be reproduced by the chassis dynamometer. For this, actual road load should be measured on a test vehicle and coastdown test is widely used method. Normally used coastdown test is to measure the times during deceleration under neutral gear and prescribed test condition. With accurate coastdown measurement results, vehicle driving pattern can be transformed to engine operation mode. For this mechanical efficiency of gear box should be measured for each gear. This study suggests new method to calculated engine operation mode with coastdown measurement under neutral and in-gear condition. And calculation results were compared with actually measured engine operation.
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.