Title: Sizing the traction motor for optimal fuel efficiency in vehicle electrification

Authors: Y. Gene Liao; Allen M. Quail Jr

Addresses: Wayne State University 4855 Fourth Street, Detroit, MI 48202, USA ' ASRC-WTSI, Inc. 35660 Beattie Drive Sterling Heights, MI 48312, USA

Abstract: This paper presents the traction motor sizing, by means of motor rated torque and speed, for optimal urban fuel economy in two mild and three strong hybridisation powertrains on front-wheel-drive vehicles. The two mild hybrids are belt-integrated-starter-generator and Crankshaft-Integrated-Starter-Generator (C-ISG) systems. The three strong hybrids include an electric machine attached to the front axle, strong C-ISG system where motor is placed between a starting clutch and transmission, and single-mode electric variable transmission. Using the vehicle performance data as constraints and the motor rated torque and speed as the design variables, the objective function is to maximise the urban fuel economy.

Keywords: component sizing; electric variable transmission; hybrid electric vehicles; HEVs; hybrid vehicles; ISG; traction motors; vehicle electrification; optimisation; fuel efficiency; urban driving; hybridisation powertrains; front-wheel drive; torque; speed; belt integrated starter generator; crankshaft integrated starter generator.

DOI: 10.1504/IJVAS.2013.053777

International Journal of Vehicle Autonomous Systems, 2013 Vol.11 No.2/3, pp.140 - 156

Received: 29 Apr 2011
Accepted: 04 Aug 2011
Published online: 30 Sep 2014 *

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