1. School of Mechanical Engineering, Beijing Institute of Technology, Beijing, P. R. China;
2. College of Urban Transportation and Logistics, Shenzhen Technology University, Shenzhen, P. R. China;
3. Department of Transmission Control, United Automotive Electronic Systems Co., Ltd. Shanghai, P. R. China;
4. New Energy Automotive Electronics Research Center, Institute of Microelectronics of Chinese Academy of Sciences, Beijing, P. R. China