There are two serious problems against the continual development of automotive industry at present. One is environmental pollution; the other is deficiency of petroleum resources. Hybrid electric vehicle (HEV) employing two power sources -internal combustion engine (ICE) and electric motor (EM), has been accepted world-widely as one of the most promising methods to solve these two problems. In Japan, the United States and European countries, governments and automobile manufactures have invested a lot to dev...
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