Brake system performance requirements of a lightweight electric/hybrid rear wheel drive vehicle

Bray, Justin T., Walker, Geoffrey R., Simpson, Andrew G. , Greaves, Matthew C., & Guymer, Ben D. (2003) Brake system performance requirements of a lightweight electric/hybrid rear wheel drive vehicle. International Journal of Vehicle Autonomous Systems, 1(3), pp. 436-448.

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Abstract

Investigates the braking performance requirements of the UltraCommuter, a lightweight series hybrid electric vehicle currently under development at the University of Queensland. With a predicted vehicle mass of 600 kg and two in-wheel motors each capable of 500 Nm of peak torque, decelerations up to 0.46 g are theoretically possible using purely regenerative braking. With 99% of braking demands less than 0.35 g, essentially all braking can be regenerative. The wheel motors have sufficient peak torque capability to lock the rear wheels in combination with front axle braking, eliminating the need for friction braking at the rear. Emergency braking levels approaching 1 g are achieved by supplementation with front disk brakes. This paper presents equations describing the peak front and rear axle braking forces which occur under straight line braking, including gradients. Conventionally, to guarantee stability, mechanical front/rear proportioning of braking effort ensures that the front axle locks first. In this application, all braking is initially regenerative at the rear, and an adaptive ''by-wire'' proportioning system presented ensures this stability requirement is still satisfied. Front wheel drive and all wheel drive systems are also discussed. Finally, peak and continuous performance measures, not commonly provided for friction brakes, are derived for the UltraCommuter's motor capability and range of operation.

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ID Code: 63574
Item Type: Journal Article
Refereed: Yes
Keywords: regenerative braking, wheel motors, electric vehicle, friction braking, peak performance, continuous performance, rear wheel drive, lightweight vehicles
ISSN: 1471-0226
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > AUTOMOTIVE ENGINEERING (090200) > Automotive Mechatronics (090203)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > AUTOMOTIVE ENGINEERING (090200) > Hybrid Vehicles and Powertrains (090205)
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Inderscience Enterprises Ltd
Copyright Statement: No part of this publication may be reproduced stored or transmitted in any material form or by any means (including electronic, mechanical, photocopying, recording or otherwise) without the prior written permission of the publisher, except in accordance with the provisions of the Copyright Designs and Patents Act 1988 or under the terms of a licence issued by the Copyright Licensing Agency Ltd or the Copyright Clearance Centre Inc.
Deposited On: 22 Oct 2014 22:54
Last Modified: 24 Oct 2014 02:13

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