Car safety, evnvironmental protection and energy saving are three key issues which must be resolved by the moden automobile industry in its development process. It is well know that the traffic jam and traffic lights force cars to brake frequently, especially for cars work in city. As a result, a large amount of energy was consumed. Provided that we can recycle those energy by translate it into the thermic energy to help the start and accelerate of cars, the dynamic property can be modified and the fuel con...