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동적 구속조건을 적용한 자동변속장치의 효과적인 시뮬레이션방법에 관한 연구
정헌술,이교일,Jeong, Heon-Sul,Lee, Kyo-Ill 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.3
Degree-Of-Freedom(DOF) for most power transmission system varies according to the operation status which consists of friction elements to change the power flow or to adjust the speed ratio such as clutches, brakes or one-way clutches. To simulate the dynamic characteristics of automatic power transmission system which is a typical example of such a variable DOF systems, many sets of governing equations and complicated phase decision routines are necessary. In this paper dynamic constraint theorem is derived explaining the torque transmission characteristics during the clutch engagement process and a robust stable algorithm is developed describing this phase transition phenomenon effectively by introducing the concept of direct torque and virtual damping. Finally, applying this algorithm to a passenger car automatic transmission gear consisting of several friction elements, an efficient simulation methods for such a complex system will be suggested that is very simple and systematic.
[동력전단계부문] 자동변속기 변속특성 및 유연변속의 이론적 해석
정헌술(Heon-Sul Jeong),박진성(Jin-Sung Park),이교일(Kyo-Ill Lee) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Current torque sensors are too expensive to be used for controller on production vehicle. To provide a basic strategy for smooth jerk shift by usage of RPM sensors only and to accomplish the shift within the designated time for clutch life, detail analysis of shift characteristics was studied. Finally The desired trajectory of slip speed was proposed for indirect jerk shift and clutch torque related with this trajectory was derived which can be used as a controller.