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박상준(Sangjoon Park),이난규(Nankyu Lee),이용규(Yongkyu Lee),박진일(Jinil Park),이종화(Jonghwa Lee) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Although effects of mechanical friction loss by Transmission is too small than other factors on FTP75 mode, because of heavy regulation about CO₂ and Fuel-economy, most of company try to improve fuel economy for transmission 워머-up using ATF 워머. The transmission friction loss that occur from process of delivery power from engine to wheels is affected by mechanical friction from rotation of gear and temperature of transmission oil. This effect is caused because the oil"s viscosity is influenced by temperature and the mechanical friction of transmission is drop down if the temperature is increased. In this study, the test is processed by the way of comprehending each gear stage"s characteristics by variable oil temperature. The characteristic is tested on a vehicle and the result is compared with theoretical value of kinematic viscosity.
운전 편차에 따른 FTP-75 모드 주행 연비 오차에 관한 연구
위효성(Hyoseong Wi),박진일(Jinil Park),이종화(Jonghwa Lee),박경석(Kyoungseok Park) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
A fuel economy of vehicle is one of the important problem in the development of vehicles. In order to improve a vehicle fuel economy, it is a very important to consider a fuel economy on FTP-75 mode driving test as an objective one. Although the test procedure is defined well, it necessarily has an error caused by disturbance. One of the important disturbance is driving pattern. A test driver cannot drive perfectly same as a former test. Thus the error caused by it is always exists. It is interesting study to know the error boundary caused by that difference. This paper focuses on vehicle fuel economy error caused by difference of driving pattern.
공회전 안전성 향상을 위한 실린더별 점화시기와 공연비 제어에 관한 연구
김태성(Taesung Kim),박진일(Jinil Park),고상근(S.Ken Kauh) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
This study aims at the enhancement of idle stability through individual cylinder ignition timing and A/F ratio control. In four cylinder engines, angular velocity for a cycle shows four max. and min. points because of four expansions and compressions. And the difference between max. and min. angular velocity is proportional to the power of each cylinder. Ignition timing is a very important factor in engine power and at idle, A/F ratio differences among cylinders are relatively larger. As the power differences among cylinders are reduced, The cycle variation of engine speed can be also reduced and then the stability is much better. Therefore, individual ignition timing and A/F ratio control are carried out respectively to improve the idle stability.<br/> The STD, the difference between max. and min. of angular velocity, and PSD though FFT were investigated to represent the idle stability objectively. In these points, the experimental results showed that both individual cylinder controls can enhance idle stability.<br/>