ABSTRACT This paper describes a driving motor torque distribution strategy of six-wheel-driven electric vehicles for optimized energy consumption. In this research, this strategy minimizes motoring power consumption and maximizes regenerative braking power under given required power condition. The torque distribution controller consists of total required motor torque calculation part, upper and optimal torque calculation part, lower level controller. The upper level controller determines total required torque of vehicle. And the torque is determined by acceleration pedal input of driver and vehicle velocity. The lower level controller calculates energy consumption in given condition and distributes motor torque to driving motor minimizing energy consumption. In distributing optimal motor torque, it is important to get accurate characteristics of driving motor and performance constraint. Motor efficiency is determined by motor speed and operating torque and maximum torque is a function of motor speed. The proposed motor torque distribution strategy has been evaluated via computer simulation of energy consumption for representative driving mode. INTRODUCTION In the last few years, the research and development of motor driven vehicles equipped with drive systems that generate the driving torque with motors, have been undertaken actively due to increasing interest in energy and environmental issues. Several types of drive system have been proposed for the motor driven vehicles. For instance, a front-or rear-wheel- driven system with two in-wheel motors is proposed. And afour-wheel-driven system with independently driven front, rear motors or four in-wheel motors for passenger vehicle and a six-wheel-driven (6WD) system with independently driven each driving motor is proposed for combat vehicle. In this paper, as a part of vehicle driving torque control for the motor driven vehicles, the driving motor control strategy for improved vehicle energy economy is investigated. This paper describes a driving motor torque distribution strategy for 6WD Electric Vehicles(EV) equipped with in- wheel motors in order to improve vehicle energy efficiency. Several studies have investigated the modeling of EV and driving motor torque distribution strategy for improved energy economy of vehicle. H. Shimizu.(1997) designed and modeled electric vehicle[ 1]. Y.Hori(2004) proposed vehicle driven by four-wheel-motor [ 2]. N. Mutoh and H. Yahagi(2005) developed control methods for EV with independently driven front and rear wheel structures [ 3]. H.Yeo(2004) proposed regenerative braking algorithm [ 4]. However, since a 6WD electric vehicle is equipped with six independent motors, a driving motor control strategy for the six in-wheel motors is required. Numerical simulation studies are conducted using MATLAB/Simulink vehicle model without transmission model for the 6WD EV in order to evaluate the proposed strategy. From the simulation results, it can be found that the proposed strategy improves energy efficiency of the vehicle. VEHICLE MODELING A driving motor torque distribution strategy is developed to improve energy economy of 6WD electric vehicle. The 6WD Development of a Motor Torque Distribution Strategy of Six-wheel-Driven Electric Vehicles for Optimized Energy Consumption2013-01-1746 Published 04/08/2013 Seungjae Yun and Kyongsu Yi Seoul National Univ Seyoung Cheon and Yeogiel Yoon Samsung Techwin Copyright © 2013 SAE International doi:10.4271/2013-01-1746Downloaded from SAE International by University of Minnesota, Monday, July 30, 2018EV is composed of In-wheel motors, battery and inverter. The 6WD EV is driven by six In-wheel motors that provide independent wheel drives as well as regenerative braking capabilities. Since required energy cannot be generated by powertrain of vehicle, battery should be equipped in order to provide vehicle with electric energy. Figure 1 shows that powertrain of 6WD EV structure. Six independent in-whee