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김영흡(Y. H. Kim),박찬일(C. I. Park),이장무(J. M. Lee) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.2
In a passenger car automatic transmission, the gear ratio is determined by the combination of clutches and brakes, and each element of the planetary gear set is rotated or held stationary by the action of them, In this study, to investigate the shift characteristics of automatic transmission, the equations of motion are derived from the dynamic model of Ravigneaux type planetary gear set and solved analytically. The shift characteristics of each element of planetary gear set during gear ratio change are investigated by considering the torques and velocities of input, reaction and output elements.<br/>
김영흡(Y. H. Kim),박찬일(C. I. Park),이장무(J. M. Lee) 한국자동차공학회 1997 한국 자동차공학회논문집 Vol.5 No.3
The dynamic characteristics during gear ratio change including the disturbance of output torque has been one of the most important issues in the study of automatic transmissions of passenger cars. In this paper, to investigate the dynamic characteristics of a passenger car automatic transmission during gear ratio change, a dynamic model of the driveline of a passenger car focused on the automatic transmission is proposed and the dynamic simulation program is developed. The results of the simulation show good agreements with the experimental data, which proves the usefulness of the dynamic model and the simulation of the driveline.
조윤호(Y.H.Cho),김영흡(Y.H.Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
The Continuously variable transmission(CVT) has better fuel economy and acceleration performance than the limited step transmissions because it can infinitely change speed ratio within the ratio coverage. To get good performance in CVT. the optimal operating line of engine should be determined as the basic information for the line pressure control and the speed ratio control. In this study, the optimal operating points of engine are determined on the basis of the engine characteristic curve and tractive effort curve. And the operating line, speed ratio map and engine speed map are calculated for the economy mode and the power mode by simulation.<br/>