[1]Department of Automotive Engineering, School of Transportation Science and Engineering, Beihang University, Beijing 100191, China;
[2]Beijing Key Laboratory for High-efficient Power Transmission andSystem Control of New Energy Resource Vehicle (Beihang University), Beijing 100191, China;
[3]Institute of Industrial and Automotive Drivetrain, Department of Mechanical Engineering, Ruhr-University Bochum, Bochum 44801, Germany;