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, Beijing Jiaotong Univ., Beijing 100044, China (corresponding author).
3. Professor, School of Mechanical, Electronic, and Control Engineering, Beijing Jiaotong Univ., Beijing 100044, China.