ZHOU Lihong1,2,GONG Jinke2,LI Bing3
(1. College of Mechanical and Transportation Engineering,Hunan University,Changsha 410082,China; 2. College of Automotive Engineering ,Hunan Mechanical & Electrical Polytechnic,Changsha 410151,China; 3. College of Electrical and Automation Engineering,Hefei University of Technology,Hefei 230009,China)