Title: Dynamic analysis and simulation of a double transition shift transmission

Authors: Di Wu; Yin-ping Chang

Addresses: Department of Mechanical Engineering, Oakland University, 2200 N. Squirrel Road, Rochester, Michigan, USA ' Department of Mechanical Engineering, Oakland University, 2200 N. Squirrel Road, Rochester, Michigan, USA

Abstract: Double transition shift (DTS) refers to the shift process in a special structured automatic transmission which employs more than one pair of clutches/brakes to perform the gear shift process. Since more elements are involved during the shift process, the DTS control algorithm is much more complicated than traditional one. DTS transmission can achieve multiple-speed gear shifts by using the minimum number of planetary gearsets and clutches/brakes, therefore the advantages of DTS transmission are simpler structure, smaller size, lighter weight, and easier maintenance. Historically, DTS transmission has been overlooked because of the complexity to perform high quality shifts. In this paper, the shift process is studied by dynamic analysis method, a simulation model is developed based on multi-body dynamics theory in which all elements interactions with varies motion states and forces are considered. A new control strategy of a patented DTS transmission is proposed, a well behaved drivability during the DTS process is achieved.

Keywords: double transition shift; DTS transmission; drivability control; shift quality; powertrain simulation; multi-body dynamics; dynamic modelling; vehicle performance.

DOI: 10.1504/IJVP.2013.058277

International Journal of Vehicle Performance, 2013 Vol.1 No.2, pp.119 - 136

Received: 13 Oct 2011
Accepted: 15 Nov 2012
Published online: 12 Jul 2014 *

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