Shift characteristics of a bilateral Harpoon-shift synchronizer for electric vehicles equipped with clutchless AMTs

Mo, W; Wu, J; Walker, PD; Zhang, N

Shift characteristics of a bilateral Harpoon-shift synchronizer for electric vehicles equipped with clutchless AMTs

Mo, W

Wu, J Walker, PD Zhang, N

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Mechanical Systems and Signal Processing, 2021, 148, pp. 1-19
Issue Date:: 2021-02-01

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Field	Value	Language
dc.contributor.author	Mo, W https://orcid.org/0000-0002-4683-7856
dc.contributor.author	Wu, J
dc.contributor.author	Walker, PD
dc.contributor.author	Zhang, N https://orcid.org/0000-0001-6408-0044
dc.date.accessioned	2022-05-18T01:47:36Z
dc.date.available	2022-05-18T01:47:36Z
dc.date.issued	2021-02-01
dc.identifier.citation	Mechanical Systems and Signal Processing, 2021, 148, pp. 1-19
dc.identifier.issn	0888-3270
dc.identifier.issn	1096-1216
dc.identifier.uri	http://hdl.handle.net/10453/157482
dc.description.abstract	This paper introduces a new concept of bilateral Harpoon-shift synchronizer for electric vehicles (EVs) equipped with multi-speed clutchless automated manual transmissions (CLAMTs), aiming to improve the shifting quality and efficiency. In addition, it overcomes some of the biggest issues of conventional counterparts, including friction loss and wear. To investigate the engaging performance of the proposed synchronizer comprehensively, a detailed and original multi-body dynamic model of the bilateral Harpoon shift is developed to capture the synchronizer's transient behavior during engagement. In the model, the engaging process is defined as six stages, and it can simulate the interactions between the engaging-related parts. Then a model of EV powertrain system, which integrates the synchronizer model, is established to analyze the gearshift vibrations, allowing to evaluate the engaging performance of the bilateral Harpoon shift in terms of shifting shocks. Also, to guarantee a smooth gear change, torque and speed profiles are designed based on a modified step function for the motor torque control and active speed synchronization. Based on the integrated model, the effects of the torque spring stiffness and tooth chamfer angle on the shifting shocks are comprehensively analyzed, and then the optimized values of these two significant parameters are obtained through quantitative analysis. Results show that the proposed synchronizer is able to achieve high quality shifting for EVs and meanwhile overcome the friction-related drawbacks of traditional synchronizers. Besides, it greatly simplifies the shift control strategy due to its special engaging mechanism.
dc.language	English
dc.publisher	Elsevier
dc.relation	http://purl.org/au-research/grants/arc/DE170100134
dc.relation.ispartof	Mechanical Systems and Signal Processing
dc.relation.isbasedon	10.1016/j.ymssp.2020.107166
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering, 0913 Mechanical Engineering, 0915 Interdisciplinary Engineering
dc.subject.classification	Acoustics
dc.title	Shift characteristics of a bilateral Harpoon-shift synchronizer for electric vehicles equipped with clutchless AMTs
dc.type	Journal Article
utslib.citation.volume	148
utslib.for	0905 Civil Engineering
utslib.for	0913 Mechanical Engineering
utslib.for	0915 Interdisciplinary Engineering
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	*
pubs.consider-herdc	false
dc.date.updated	2022-05-18T01:47:34Z
pubs.publication-status	Published
pubs.volume	148

Abstract:

This paper introduces a new concept of bilateral Harpoon-shift synchronizer for electric vehicles (EVs) equipped with multi-speed clutchless automated manual transmissions (CLAMTs), aiming to improve the shifting quality and efficiency. In addition, it overcomes some of the biggest issues of conventional counterparts, including friction loss and wear. To investigate the engaging performance of the proposed synchronizer comprehensively, a detailed and original multi-body dynamic model of the bilateral Harpoon shift is developed to capture the synchronizer's transient behavior during engagement. In the model, the engaging process is defined as six stages, and it can simulate the interactions between the engaging-related parts. Then a model of EV powertrain system, which integrates the synchronizer model, is established to analyze the gearshift vibrations, allowing to evaluate the engaging performance of the bilateral Harpoon shift in terms of shifting shocks. Also, to guarantee a smooth gear change, torque and speed profiles are designed based on a modified step function for the motor torque control and active speed synchronization. Based on the integrated model, the effects of the torque spring stiffness and tooth chamfer angle on the shifting shocks are comprehensively analyzed, and then the optimized values of these two significant parameters are obtained through quantitative analysis. Results show that the proposed synchronizer is able to achieve high quality shifting for EVs and meanwhile overcome the friction-related drawbacks of traditional synchronizers. Besides, it greatly simplifies the shift control strategy due to its special engaging mechanism.

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http://hdl.handle.net/10453/157482