The Research Of Regenerative Braking System For Electric Vehicles

The electric vehicles, which are generically economic and environmental friendly, have become one of the most important hotspots in transportation research worldwide. However, the range of electric vehicles is much smaller than the traditional internal combustion engine automobile, this insufficient has seriously affected the rapid promotion of the electric vehicles. The electric regenerative braking system is an effective method which can increases the driving range of the electric vehicles to recycle the brake energy.The main work in this thesis is to develop the 3kW Switch Reluctance Motor Drive system on electric vehicles. Firstly, the background and significance of regenerative braking, current development situation in and aboard were summarized. Also, the fundamental demands of drive system are discussed. The Switch Reluctance Drive system, which has outstanding merit in the field of structure, efficiency and reliability, is applied to this application occasion. Then, every part of Switch Reluctance Drive system is introduced. Some usual control methods and its advantages and disadvantages are presented. The characteristics of Switch Reluctance Motor regenerative braking are simulated using Simulink of MATLAB 2009a.Secondly, the thesis discussed the regenerative braking mode of Switch Reluctance Motor; developed the hardware design of electric vehicles drive system based on SRM. The key work includes the design of main circuit of SRD power converter; the type choice of MOSFET; the design of drive circuit based on IR2110; the estimation of power converter losses; the radiator design of power component. Meanwhile, the software of system is programmed. The modular structured programming makes the program readable and modifiable.Finally, the experiments of the designed SRD system are made after debugging the hardware circuit board and the corresponding software program. The experimental results are analyzed and validate the rationality of the system designed. For the limit of the experiment condition, we do simulation instead of experiment on regenerative braking. Some suggestions are given for next step at last.