Model and gear shifting control of a novel two-speed transmission for battery electric vehicles

Tian, Y; Zhang, N; Zhou, S; Walker, PD

Model and gear shifting control of a novel two-speed transmission for battery electric vehicles

Tian, Y Zhang, N

Zhou, S

Walker, PD

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Publisher:: PERGAMON-ELSEVIER SCIENCE LTD
Publication Type:: Journal Article
Citation:: Mechanism and Machine Theory, 2020, 152
Issue Date:: 2020-10-01

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Field	Value	Language
dc.contributor.author	Tian, Y
dc.contributor.author	Zhang, N https://orcid.org/0000-0001-6408-0044
dc.contributor.author	Zhou, S https://orcid.org/0000-0001-5070-141X
dc.contributor.author	Walker, PD
dc.date.accessioned	2021-03-07T03:50:30Z
dc.date.available	2021-03-07T03:50:30Z
dc.date.issued	2020-10-01
dc.identifier.citation	Mechanism and Machine Theory, 2020, 152
dc.identifier.issn	0094-114X
dc.identifier.issn	1873-3999
dc.identifier.uri	http://hdl.handle.net/10453/146842
dc.description.abstract	© 2020 Integrating a multispeed transmission into the electric drive system provides the potential of ulteriorly improving the overall efficiency of battery electric vehicles (BEVs). In this paper, we propose a novel two-speed planetary automated manual transmission (PAMT) which features a more compact mechanical structure than clutchless automated manual transmission (CLAMT) and easier gear shifting control than power-on transmissions. To present the transient behaviours during the gear shifting, a detailed and original dynamical model of the electrified powertrain is developed, including an electric machine (EM), a two-speed PAMT, synchronizer mechanisms, driveline and vehicle, etc. Afterwards, the gear shifting control system is devised, and the gearshift process is orderly divided into five stages based on the proposed control strategy. Next, three alternative planning torque trajectories, i.e., the third-degree polynomial (TDP), the fifth-degree polynomial (FDP) and the seventh-degree polynomial (SDP), are proposed to control the EM torque at the first and the fifth stages of the gear shifting respectively. Subsequently, a series of simulations are performed to validate which candidate torque trajectory is capable of achieving the optimal gear shifting quality in term of reducing the longitudinal vehicle jerk and shift durations. This study provides a beneficial reference for the development of BEVs’ transmission system.
dc.language	English
dc.publisher	PERGAMON-ELSEVIER SCIENCE LTD
dc.relation	Changsha Xiangni Auto Technology Co Ltd
dc.relation	http://purl.org/au-research/grants/arc/DP150102751
dc.relation.ispartof	Mechanism and Machine Theory
dc.relation.isbasedon	10.1016/j.mechmachtheory.2020.103902
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0906 Electrical and Electronic Engineering, 0910 Manufacturing Engineering, 0913 Mechanical Engineering
dc.subject.classification	Design Practice & Management
dc.title	Model and gear shifting control of a novel two-speed transmission for battery electric vehicles
dc.type	Journal Article
utslib.citation.volume	152
utslib.for	0902 Automotive Engineering
utslib.for	0913 Mechanical Engineering
utslib.for	0906 Electrical and Electronic Engineering
utslib.for	0910 Manufacturing Engineering
utslib.for	0913 Mechanical Engineering
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
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	closed_access	*
dc.date.updated	2021-03-07T03:50:25Z
pubs.publication-status	Published
pubs.volume	152

Abstract:

© 2020 Integrating a multispeed transmission into the electric drive system provides the potential of ulteriorly improving the overall efficiency of battery electric vehicles (BEVs). In this paper, we propose a novel two-speed planetary automated manual transmission (PAMT) which features a more compact mechanical structure than clutchless automated manual transmission (CLAMT) and easier gear shifting control than power-on transmissions. To present the transient behaviours during the gear shifting, a detailed and original dynamical model of the electrified powertrain is developed, including an electric machine (EM), a two-speed PAMT, synchronizer mechanisms, driveline and vehicle, etc. Afterwards, the gear shifting control system is devised, and the gearshift process is orderly divided into five stages based on the proposed control strategy. Next, three alternative planning torque trajectories, i.e., the third-degree polynomial (TDP), the fifth-degree polynomial (FDP) and the seventh-degree polynomial (SDP), are proposed to control the EM torque at the first and the fifth stages of the gear shifting respectively. Subsequently, a series of simulations are performed to validate which candidate torque trajectory is capable of achieving the optimal gear shifting quality in term of reducing the longitudinal vehicle jerk and shift durations. This study provides a beneficial reference for the development of BEVs’ transmission system.

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http://hdl.handle.net/10453/146842