1. Ph.D. Student, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong Univ., Beijing 100044, China.
2. Professor, School of Mechanical, Electronic and Control Engineering, Beijing Key Laboratory of Powertrain for New Energy Vehicle, Key Laboratory of Vehicle Advanced Manufacturing, Measuring and Control Technology, Ministry of Education, Beijing Jiaotong Univ., Beijing 100044, China (corresponding author).
3. Ph.D. Lecturer, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong Univ., Beijing 100044, China.
4. M.S. Student, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong Univ., Beijing 100044, China.