Abstract: With the gradual enhancement of people's awareness of environmental protection and harmonious coexistence with nature,more and more people begin to pay attention to environmental pollution,especially the exhaust emissions of diesel and gasoline vehicles,which has become an urgent problem to be solved in many countries.Focusing on the energy saving and zero emission of electrical cars,this paper puts forward an pure electric vehicle controller based on CAN bus,and studies the power charging and power changing of electrical vehicles.Under the premise of ensuring the safety of power charging and changing,this vehicle controller tests in advance whether the vehicle is ready to work,then controls the process of power charging and changing of the vehicle.At the same time,the vehicle controller has the online upgrade function,which can realize the remote upgrade of the vehicle,and further provides convenience to users.

Key words: Electric car power changing, Electric car power charging, Remote upgrade, Vehicle controller