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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.
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.