| Formula SAE(FSAE)is an international competition designed specifically for college students,who need to design and manufacture a mini single-seat formula racing car in a year and participate in four kinds of competitive race.In this thesis,a regenerative braking system based on maximal regenerative power is designed and applied on electric FSAE racing car,which can not only improve energy utilization efficiency,but also reduce the number of batteries.So it can decrease the weight of the racing car and improve its endurance distance.This thesis mainly includes the following aspects:(1)The vehicle dynamic model and electric system model of electric FSAE racing car are established.Based on PMSM Electromechanics Theory,the regenerative braking control strategy based on maximal regenerative power is proposed.Simulation results prove this strategy has high efficiency.(2)The software and hardware for the regenerative braking system are designed and realized.Slider mechanism is added between hydraulic cylinder and balance bar to change the structure of braking pedal,which decouples hydraulic brake and electric brake.Safety circuit board is redesigned to ensure security and stability of the electric system by cooperating with BMS and IMD.Besides,By programming with Labview,the vehicle dynamic control strategy and regenerative braking strategy is combined and constructed in the ECU(Electronic Control Unit)of the FSAE racing car,which the performance is quite satisfied.(3)three types of road test is designed and complished.Data such as current,voltage and acceleration are collected in the driving conditions including:straight acceleration,high speed cornering,and long-time drive.The test data is analyzed and proved that the regenerative braking system could run stably for a long time and ensure good handling stability and regenerative efficiency.This research is helpful to design similar regenerative braking system on racing car. |
PDF Full Text Request