1. College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2. School of Mechanical and Automobile Engineering, Liaocheng University, Liaocheng 252059, China
3. College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China
4. Department of Automotive Engineering, Dezhou Vocational and Technical College, Dezhou 253034, China