A numerical study of the impact of wet clutch drag torque on the performance of two-speed electric vehicles

Zhou, X; Walker, PD; Zhang, N

A numerical study of the impact of wet clutch drag torque on the performance of two-speed electric vehicles

Zhou, X Walker, PD Zhang, N

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Publisher:: Inderscience Publishers
Publication Type:: Journal Article
Citation:: International Journal of Vehicle Performance, 2016, 2, (2), pp. 178-204
Issue Date:: 2016-01-01

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Field	Value	Language
dc.contributor.author	Zhou, X
dc.contributor.author	Walker, PD
dc.contributor.author	Zhang, N https://orcid.org/0000-0001-6408-0044
dc.date.accessioned	2022-02-01T02:12:12Z
dc.date.available	2022-02-01T02:12:12Z
dc.date.issued	2016-01-01
dc.identifier.citation	International Journal of Vehicle Performance, 2016, 2, (2), pp. 178-204
dc.identifier.issn	1745-3194
dc.identifier.issn	1745-3208
dc.identifier.uri	http://hdl.handle.net/10453/154018
dc.description.abstract	In order to study the economy performance of a two-speed electric vehicle (EV) equipped with a wet dual clutch transmission (DCT), this paper presents a theoretical analysis of drag torque in wet clutches, and investigates the relationship between drag torque, transmission gear ratios, and their optimisation. As such, the application of drag torque effects in gear ratio optimisation is conducted. Through this paper mathematic models for a two-speed EV is presented and a procedure to obtain the reasonable optimal gear ratio pairs and corresponding shift schedule for a two-speed EV is described in detail, with consideration of wet clutch drag torque. Through simulation and parametric analysis using different test driving cycles, including constant speed, NEDC and UDDS, the effects of drag torque is studied in gear ratio selection and EV efficiency and economy, with result demonstrating a significant influence on overall vehicle performance, and degradation of drivetrain efficiency.
dc.language	en
dc.publisher	Inderscience Publishers
dc.relation	AutoCRC Ltd
dc.relation	Changsha Xiangni Auto Technology Co Ltd
dc.relation	Ministry of Science Technology, P.R. China
dc.relation.ispartof	International Journal of Vehicle Performance
dc.relation.isbasedon	10.1504/IJVP.2016.075320
dc.rights	info:eu-repo/semantics/closedAccess
dc.title	A numerical study of the impact of wet clutch drag torque on the performance of two-speed electric vehicles
dc.type	Journal Article
utslib.citation.volume	2
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Mechanical and Mechatronic Engineering
utslib.copyright.status	closed_access	*
dc.date.updated	2022-02-01T02:12:10Z
pubs.issue	2
pubs.publication-status	Published
pubs.volume	2
utslib.citation.issue	2

Abstract:

In order to study the economy performance of a two-speed electric vehicle (EV) equipped with a wet dual clutch transmission (DCT), this paper presents a theoretical analysis of drag torque in wet clutches, and investigates the relationship between drag torque, transmission gear ratios, and their optimisation. As such, the application of drag torque effects in gear ratio optimisation is conducted. Through this paper mathematic models for a two-speed EV is presented and a procedure to obtain the reasonable optimal gear ratio pairs and corresponding shift schedule for a two-speed EV is described in detail, with consideration of wet clutch drag torque. Through simulation and parametric analysis using different test driving cycles, including constant speed, NEDC and UDDS, the effects of drag torque is studied in gear ratio selection and EV efficiency and economy, with result demonstrating a significant influence on overall vehicle performance, and degradation of drivetrain efficiency.

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http://hdl.handle.net/10453/154018