Study On The Control Strategy Of Synergic Electric Power Supply System On HEV

In the past twenty years , the automotive industry has got a great development, but at the same time it makes energy source shortage and enviroment pollution arising worse and worse, and has been given more and more attention all over the world .To solve this problem, development of new type motor vehicle with low energy consumption and emmission is being under-way by automobile industry and research institude ,which is encouraged by government policy .The Hybrid Electric Vehicle(HEV) can combine the goodness of conventional internal-combustion engine vehicle and electric vehicle,which can not only satisfy the performance that required,but also can achieve the goal of low energy consumption and ultra-low emmissions .HEV have much market potential and receive much recognition.Recently,as the development of HEV, there has more expect on electrical source,which can quickly charge and discharge, but battery can not satisfy it because of the poor ability under low temperature, the short life and can not quickly charge and discharge. The ultracapacitors are an attractive option in hybrid vehicles due to their high power density and long lifetime, and are very suitable for the highpower need like acceleration ,brake or mountain climbing of the vehicle. But the specific energy of ultracapacitor is very small,so the ultracapacitor is unfit...