1. Liangzhi Zhang:
College of Control Science and Engineering, Shandong University, Jinan250061, China; College of Traffic and Logistics Engineering, Shandong Jiaotong University, Jinan 250023, China
2. Lei Jia:
College of Control Science and Engineering, Shandong University, Jinan250061, China; College of Traffic and Logistics Engineering, Shandong Jiaotong University, Jinan 250023, China
3. Changhong Mei:
Jinan Qingqi Motorcycle CO, Ltd, Jinan 250014, Shandong, China