1. Departments of Energy and Power Engineering, Automotive Engineering College, Shandong Jiaotong University, Ji Nan 250357, China
2. Intelligent Testing and High-end Equipment of Automotive Power Systems Shandong Province Engineering Research Center, Ji Nan 250357, China
3. Key Laboratory of Transportation Industry for Transport Vehicle Detection, Diagnosis and Maintenance Technology, Ji Nan 250357, China
4. College of Mathematics and Physics, Inner Mongolia Minzu University, Tong Liao, Inner Mongolia, 028043, China