Title: A study on the improvement of the shift characteristics for the passenger car automatic transmission

Authors: Han-Sang Jo, Yeong-Il Park, Jang-Moo Lee, Wook-Jin Jang, Jin-Ho Park, Won-Sik Lim,

Addresses: Institute of Advanced Machinery and Design, Seoul National University, Seoul, Korea. Department of Mechanical Design, Seoul National University of Technology, Seoul, Korea. Department of Mechanical Design and Production Engineering, Seoul National University, Seoul, Korea. Department of Mechanical Design and Production Engineering, Seoul National University, Seoul, Korea. Department of Mechanical Design and Production Engineering, Seoul National University, Seoul, Korea. Department of Automotive Engineering, Seoul National University of Technology, Seoul, Korea

Abstract: Dynamic simulation techniques are developed to analyse the shift characteristics of the vehicle powertrain with automatic transmissions. In this study, the mathematical modelling of powertrain components such as engine, clutch system, planetary gear system and road load, is presented for the simulation. The clutch engagement condition, which determines the degree of freedom of the system, is also proposed. By using a detailed nonlinear model of torque converter, it is possible to accurately analyse the extremely transient state such as the shift. Dynamo-based experiments are carried out to prove the validity of the proposed simulation techniques. Using the developed simulation program, the effects of the dynamic design variables and the control conditions, focused on the shift, are evaluated to improve the driving comfortability.

Keywords: dynamic simulation techniques; shift characteristics; driving comfortability.

DOI: 10.1504/IJVD.2000.001898

International Journal of Vehicle Design, 2000 Vol.23 No.3/4, pp.307-328

Available online: 14 Dec 2003 *

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