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김정석(Jeongseok Kim),채강석(Kangseog Chae),김숭기(Soongkee Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The purpose of present study is to investigate the influence of vehicle acceleration such as cornering, braking and acceleration on the engine oil starvation phenomenon of the internal combustion engines. In the starvation condition, oil pressure is not maintained in an engine due to the air entering at the suction pipe inlet. Computer aided analysis is useful to simulate oil movement under the worst case and design can be easily changed based on analysis result, but the analysis can’t consider oil quantity under the real vehicle running condition. Engine bench tilting test is more accurate to evaluate the oil starvation, but it is hard to simulate maximum transient tilt angle. It is important that all tilt stands used to test the engine lubrication system should be capable of achieving tilt speed as close to the vehicle condition as possible since the speed may have an impact on the oil pressure. In the present study, vehicle tilting test is introduced for most effective evaluation on the engine oil starvation phenomenon. Test procedure and result evaluation criteria of the vehicle tilting test are also presented.
강혁진(Hyukjin Kang),김정석(Jeongseok Kim),채강석(Kangseog Chae) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
A wide variety of engine ventilation system concepts are used to circulate blow-by gases inside of engine for gasoline engines. For turbocharged gasoline engine, the complexity rises due to additional connection to turbocharger. One difficulty with engine ventilation is that many hardware concepts are possible and do exist in many Automotive companies and the industry does not seem to converge to one best practice regarding type of blow-by control devices and usage of fresh air. This research focus on the systematic comparison for specifications, system characteristics, advantages, and disadvantages of various ventilation system. The purpose of this study is to define important criteria necessary to meet system requirements and to decide the best system architecture of gasoline turbo engines. In order to decide optimal ventilation system for turbocharged gasoline engine, Pugh concept selection matrix is utilized to list the various concepts and evaluate them based on requirement.