With the acceleration of the process of modernization and development of automobile industry, urban
vehicle radiated noise; energy represents about 75% of ambient noise, the urban environment, the main
noise source. Electric Vehicle noise comes mainly from vehicle dynamic systems and non-power system
noise. Power system includes a vehicle and vehicle speed, turning on the engine intake and exhaust noise
produced when, and when the drive engine noise, body vibration and noise. Non-power system is mainly
car horns, brake noise. Electric vehicle is a vehicle power supply as the power, in whole or in part by the
motor drive the wheels driving, the advantage is the ability to reduce oil usage, so as to achieve energy
conservation, energy conservation purposes.