Title: New methods for modelling and optimisation of multispeed transmission in an electric vehicle

Authors: Yuhong Fang; Jiageng Ruan; Paul D. Walker

Addresses: Faculty of Engineering and Information Technology, School of Electrical, Mechanical, and Mechatronic Systems, University of Technology, Sydney, P.O. Box 123 Broadway, New South Wales, 2007, Australia ' Faculty of Engineering and Information Technology, School of Electrical, Mechanical, and Mechatronic Systems, University of Technology, Sydney, P.O. Box 123 Broadway, New South Wales, 2007, Australia ' Faculty of Engineering and Information Technology, School of Electrical, Mechanical, and Mechatronic Systems, University of Technology, Sydney, P.O. Box 123 Broadway, New South Wales, 2007, Australia

Abstract: This paper provides a new and easy way that a diagram-model with vehicle speed - vehicle torque (VS-VT) coordinates, as a basis to test the efficiency of Electric Machine (EM) in a multi-speed powertrain. A 2-speed dual clutch transmission (DCT) is used as the investigation object. To validate the new method, a Simulink model and a testing rig in the laboratory are involved. Results demonstrate that the new method is simpler than the Simulink model and testing rig to make the characteristics of the electric motor more visible, which provides more space for further investigation. Based on the new diagram model, another new method for the optimisation of gear ratios is introduced, which is based on the cycle tracks density (CTD) on the new diagram-model. Thanks to the new process, the performance of the electrified drivetrain will be improved and researching and developing investment can be saved through an easy and visible process.

Keywords: modelling; multi-speed; diagram-model; efficiency; optimisation; gear ratios.

DOI: 10.1504/IJVP.2018.095338

International Journal of Vehicle Performance, 2018 Vol.4 No.3, pp.259 - 281

Received: 20 Oct 2016
Accepted: 31 Aug 2017
Published online: 03 Oct 2018 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article