^pof;
Automotive;
Engineering,;
Nanjing;
University;
of;
Aeronautics;
and;
Astronautics,;
Nanjing;
210016,;
China;
^pKey;
Laboratory;
of;
Mechanical;
Transmission,;
Chongqing;
University,;
Chongqing;
400044,;
China;
^pEngineering;
Laboratory;
for;
Electric";
Vehicles,;
Beijing;
Institute;
of;
Technology;
Beijing;
100081,;
China;