| A Multi-objective Optimization Control Strategy of a Range-Extended Electric Vehicle for the Trip Range and Road Gradient Adaption
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| Xinyou Lin , Zhiyong Chen , Jiajin Zhang , Chaoyu Wu |
| School of Mechanical Engineering and Automation , Fuzhou University |
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| ABSTRACT |
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The road gradient and trip range are of great signifi cance in fuel consumption and emissions of a range-extended electric
vehicle (REEV). However, the traditional energy management strategy failed to consider the road gradient. To address this
issue, a multi-objective optimization adaptive control strategy is proposed to improve the fuel consumption and emissions
of the REEVs. Firstly, a multi-objective optimization adaptive control strategy is developed based the equivalent consumption
minimization strategy integrated with adaptive equivalent factor (EF). The EF is updating according to the road slope
by using a proportional-integral controller. To investigate the impacts of the road gradient on emissions, the numerical
models between road gradient and emissions are established. Furthermore, an optimal torque distribution strategy is proposed
according to the weights of fuel and emissions, which realizes the tracking of the SOC trajectory and improves the
fuel economy and emission performance of the vehicle. Finally, various strategies are carried out to verify the superiority
of the proposed strategy by numerical validations. Compared with the control strategy considered fuel consumption only,
the validation results show that the engine CO, HC, and NOx are reduced by 9.47, 2.33, and 4.10%, respectively, while
compromising fuel economy by 3.3%. |
| Key Words:
Range-extended electric vehicle · Energy management · Equivalent consumption minimization strategy · Multiobjective optimization · Fuel economy · Emissions
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Corresponding Author.
Zhiyong Chen , Email. 
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