The Safety and Dynamic Performance of Blended Brake System on a Two-Speed DCT Based Battery Electric Vehicle

Ruan, J; Walker, P; Zhang, N; Xu, G

The Safety and Dynamic Performance of Blended Brake System on a Two-Speed DCT Based Battery Electric Vehicle

Ruan, J

Walker, P

Zhang, N

Xu, G

Permalink

Publication Type:: Journal Article
Citation:: SAE International Journal of Passenger Cars - Mechanical Systems, 2016, 9 (1), pp. 143 - 153
Issue Date:: 2016-04-05

Open Access

Copyright Clearance Process

Recently Added
In Progress
Open Access

This item is open access.

Adobe PDF

Download Published VersionAdobe PDF (4.08 MB)

View on publisher's site

View statistics

Full metadata record

Field	Value	Language
dc.contributor.author	Ruan, J https://orcid.org/0000-0003-4481-4893	en_US
dc.contributor.author	Walker, P https://orcid.org/0000-0003-3988-3966	en_US
dc.contributor.author	Zhang, N https://orcid.org/0000-0001-6408-0044	en_US
dc.contributor.author	Xu, G	en_US
dc.date.issued	2016-04-05	en_US
dc.identifier.citation	SAE International Journal of Passenger Cars - Mechanical Systems, 2016, 9 (1), pp. 143 - 153	en_US
dc.identifier.issn	1946-3995	en_US
dc.identifier.uri	http://hdl.handle.net/10453/98667
dc.description.abstract	Copyright © 2016 SAE International. Regenerative braking has been widely accepted as a feasible option to extend the mileage of electric vehicles (EVs) by recapturing the vehicle’s kinetic energy instead of dissipating it as heat during braking. The regenerative braking force provided by a generator is applied to the wheels in an entirely different manner compared to the traditional hydraulic-friction brake system. Drag torque and efficiency loss may be generated by transmitting the braking force from the motor, axles, differential and, specifically in this paper, a two-speed dual clutch transmission (DCT) to wheels. Additionally, motors in most battery EVs (BEVs) and hybrid electric vehicle (HEVs) are only connected to front or rear axle. Consequently, conventional hydraulic brake system is still necessary, but dynamic and supplement to motor brake, to meet particular brake requirement and keep vehicle stable and steerable during braking. Therefore, a complicated effect on the safety and performance of braking, mainly relating to tyre slips and locks, vehicle body bounces and braking distance will be applied by the blended brake system. In this paper, the brake energy recovery potentials of typical driving cycles are presented. Relevant critical limitations are introduced to define the available brake force distribution range for front and rear axles. Then the distribution strategies are compared and analyzed to achieve a satisfied balance between braking performance, driving comfort and energy recovery rate. Next, the required motor brake force is tuned, according to the response time and efficiency loss in transfer process which obtained in testing bench. At last, solutions for some special cases are proposed, for instance, motor brake torque interruption when downshifting occurs on long downhill. A credible conclusion is gained, through experimental validation of optimized brake force distribution strategy on a two-speed DCT based BEV testing rig, that the selected force distribution strategy help the blended brake system achieve a comfortable and safety braking during all driving conditions.	en_US
dc.relation.ispartof	SAE International Journal of Passenger Cars - Mechanical Systems	en_US
dc.relation.isbasedon	10.4271/2016-01-0468	en_US
dc.title	The Safety and Dynamic Performance of Blended Brake System on a Two-Speed DCT Based Battery Electric Vehicle	en_US
dc.type	Journal Article
utslib.citation.volume	1	en_US
utslib.citation.volume	9	en_US
utslib.for	0902 Automotive Engineering	en_US
utslib.for	09 Engineering	en_US
pubs.embargo.period	Not known	en_US
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
pubs.organisational-group	/University of Technology Sydney/Students
utslib.copyright.status	open_access
pubs.issue	1	en_US
pubs.publication-status	Published	en_US
pubs.volume	9	en_US

Abstract:

Copyright © 2016 SAE International. Regenerative braking has been widely accepted as a feasible option to extend the mileage of electric vehicles (EVs) by recapturing the vehicle’s kinetic energy instead of dissipating it as heat during braking. The regenerative braking force provided by a generator is applied to the wheels in an entirely different manner compared to the traditional hydraulic-friction brake system. Drag torque and efficiency loss may be generated by transmitting the braking force from the motor, axles, differential and, specifically in this paper, a two-speed dual clutch transmission (DCT) to wheels. Additionally, motors in most battery EVs (BEVs) and hybrid electric vehicle (HEVs) are only connected to front or rear axle. Consequently, conventional hydraulic brake system is still necessary, but dynamic and supplement to motor brake, to meet particular brake requirement and keep vehicle stable and steerable during braking. Therefore, a complicated effect on the safety and performance of braking, mainly relating to tyre slips and locks, vehicle body bounces and braking distance will be applied by the blended brake system. In this paper, the brake energy recovery potentials of typical driving cycles are presented. Relevant critical limitations are introduced to define the available brake force distribution range for front and rear axles. Then the distribution strategies are compared and analyzed to achieve a satisfied balance between braking performance, driving comfort and energy recovery rate. Next, the required motor brake force is tuned, according to the response time and efficiency loss in transfer process which obtained in testing bench. At last, solutions for some special cases are proposed, for instance, motor brake torque interruption when downshifting occurs on long downhill. A credible conclusion is gained, through experimental validation of optimized brake force distribution strategy on a two-speed DCT based BEV testing rig, that the selected force distribution strategy help the blended brake system achieve a comfortable and safety braking during all driving conditions.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/98667