Browse > Article

A Study on the Evaluation Method of the Operation Stability of a Torque Converter Mounted on Industrial Vehicle  

Kim, Beom-Soo (School of Mechanical & Aerospace Engineering, Seoul National University)
Lim, Won-Sik (Department of Automotive Engineering, Seoul National University of Technology)
Cha, Suk-Won (School of Mechanical & Aerospace Engineering, Seoul National University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.15, no.3, 2007 , pp. 91-98 More about this Journal
Abstract
This paper presents the induced mathematical modeling equations for evaluating the operation stability with automatic transmission of heavy duty vehicle. This theoretical approach indicates that linearized governing equations of system can be converted into eigen-value problems. if the eigen-value has positive number, we can predict the engine operating point locates an unstable operating region. To be a stable state, the unstable operating point diverges toward a stable point which is able to maintain uniform velocity. Based on the previous theoretical analysis, we carry out dynamic simulation to show the behavior of engine operating point and torque converter in transient state. As a result of the dynamic simulation, the suggested theoretical method is found to be reasonable for evaluating the operation stability of a torque converter. In addition, the numerical results explain the engine stops and fluctuating phenomenon in reality.
Keywords
Torque converter; Eigen-value; Operation stability; Performance matching; Capacity factor; Speed ratio; Torque ratio;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 W.-S. Lim and J.-W. Lee, 'Development of the Variable Parametric Performance Model of Torque Converter for the Analysis of the Trasient Characteristics of Automatic Transmis sion,' Transactions of KSAE, Vol.10, No.1, pp.244-254, 2002   과학기술학회마을
2 B. E. Cartwright, Design Practices : Passenger Car Automatic Transmission, 3rd Editon, AE-18, SAE, NewYork, pp.100-120, 1994
3 S. R. Singiresu, Applied Numerical Methods for Engineers and Scientists, Prentice Hall, New Jersey, pp.631-691, 2002
4 A. J. Kotwicki, 'Dynamic Model for Torque Converter Equipped Vehicles,' SAE 820393, 1982
5 H. Kitahara and K. Ikeura, 'Transient Torque Control during Ratio Change in Automatic Transmission,' JSAE Review, Vol.9, No.4, pp.236-240, 1988
6 W.-S. Lim, A Study on the Analysis/Design of a Torque Converter and the Analysis of the Dynamic Characteristics of Automatic Transmission, Seoul National Graduate School, pp.100-123, 1995
7 H. S. Jo, W. S. Kim, J. M. Lee and J. Y. Kim, 'Dynamic Performance Estimation and Optimization for the Power Transmission of a Heavy Duty Vehicle,' Transactions of KSAE, Vol.4 , No.1, pp.63-74, 1996