| With the rapid development of society, the two major issues, the automotive industry facing energy shortage and environmental pollution, have attached great importance, the development and application of electric vehicles has become a research hotspot. Regenerative braking system has an important influence in the energy of the electric vehicle utilization and driving mileage, it is a key energy-saving technology in field of electric vehicles. Therefore, the regenerative braking system for electric vehicles has an important significance.In this paper, supported by national863project—’key technologies of the next generation pure electric drive vehicle electronic control system’ and the project—new energy industry development special fund basic research projects of Shenzhen City—’the research on key technology of four-wheel independent drive electric vehicles control systems’, giving a study on regenerative braking control strategies of four-wheel hub-motor drive electric vehicle. The research analyzed four-wheel hub-motor drive electric vehicle regenerative braking constraint conditions, considering the brake regulations, the motor peak torque, charging the battery power constraints, according to the initial vehicle speed, braking pedal position and the battery SOC value developed its regenerative braking control strategies, and developed and analyzed a regenerative braking simulation model in Matlab/Simulink. The simulation results show that according to established regenerative braking control strategies, the four-wheel hub-motor drive electric vehicle can brake well. The higher the initial braking speed is, the more the recovery of braking enegy. The greater the brake patal location is, the less the recovery of braking enegy. Low battery initial SOC value has little effect on recovery of braking enegy. When the SOC value is bigger than0.95, there is no recovery of braking enegy.Combined with the characteristics of four-wheel hub-motor drive electric vehicles, completed the test bench design of the wheel hub-motor regenerative braking, including the design of the wheel hub motor system, the flywheel system design, speed torque measurement system design, the mechanical brake system design and the design of transmission systems and protection devices; Completed a bench test of the hardware required for circuit design, including the motor drive circuit, braking circuit, the signal acquisition circuits, etc.; Designed the hub-motor regenerative braking software program in the virtual instrument labvIEW; Through the regenerative braking bench test, the results showed that the hub-motor regenerative braking system can be very good at the recovery of braking energy the same time to make car brake and verified the importance of the regenerative braking system of four-wheel hub-motor drive electric vehicles to improve the energy efficiency and give a foundation for the further research on hub-motor regentive braking system. |
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