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Mathematical Problems in Engineering
Volume 2016, Article ID 7039309, 7 pages
Research Article

Study on Power Switching Process of a Hybrid Electric Vehicle with In-Wheel Motors

1School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China
2Key Laboratory of Ministry of Public Security for Road Traffic Safety, Wuxi 214151, China

Received 11 March 2016; Revised 20 June 2016; Accepted 10 July 2016

Academic Editor: Guangming Xie

Copyright © 2016 Shaohua Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Hybrid electric vehicles with in-wheel motors (IWM) achieve a variety of driving modes by two power sources—the engine and the IWM. One of the critical problems that exists in such vehicle is the different transient characteristics between the engine and the IWM. Therefore, switching processes between the power sources have noteworthy impacts on vehicle dynamics and driving performance. For the particular switching process of the pure electric mode to the engine driving mode, a specific control strategy coordinating clutch torque, motor torque, and engine torque was proposed to solve drivability issues caused by inconsistent responses of different power sources during the mode transition. The specific switching process could be described as follows: the engine was started by IWM with the clutch serving as a key enabling actuator, dynamic torque compensation through IWM was implemented after engine started, and, meanwhile, engine speed was controlled to track the target speed through the closed loop PID control strategy. The bench tests results showed that the vehicle jerk caused during mode switching was reduced and fast and smooth mode switching was realized, which leads to the improvement of vehicle’s riding comfort.