Research On Regenerative Braking System Of FSAE Racing Car

Formula SAE(FSAE) is an international competition designed specifically for college students. The event has been rapidly developing since it was introduced into China in 2010. Electric FSAE racing competition was added to the event in 2013. Regenerative braking is an important energy-saving technology of eclectic-driven vehicle, part of the kinetic energy which dissipates in the form of heat during braking can be recovered in the form of electric by using this technology. Thus, the mileage of electric-driven vehicle can be improved. The way of adding this technology into an electric FSAE racing car can not only improve its mileage and energy efficiency, but also can be treated as a new exploration which bridges the gap between traditional vehicle technologies and racing vehicle technologies. Therefore, the introduction of this function has a profound engineering practice value.Aiming at the achievement of regenerative braking function on an electric FSAE racing car, following studies are fulfilled:Firstly, based on the analysis of relevant design parameters of an electric FSAE racing car, simulation models which are suitable for fulfilling the simulation of rear axle drive vehicle are established through the combination of theoretical modeling and numerical modeling in Advisor software.Then, an easily achieved parallel brake force distribution control strategy is carried out based on the analysis of braking safety and characteristics of the research object. At the same time, in order to improve the energy recovery rate and to enhance braking safety, a new regenerative braking control strategy based on adaptive fuzzy PID algorithm is proposed. Simulation models of the two control strategies are established in Matlab/simulink. Through the co-simulation of the models established in Matlab/simulink and Advisor under the endurance racing condition, the energy recovery effects of the two control strategies are analyzed. Also, the feasibility of the two control strategies is verified according to the simulation result.Finally, the hardware and software designs of the core controller are accomplished based on the analysis of the specific function of regenerative braking controller and the parallel regenerative braking control strategy established. Taking the actual sensor signal as input, semi physical simulation experiment on the control system designed is carried out. The feasibility of the control system is verified according to the result of the experiment.The regenerative braking system designed in this paper has high practical value. At the same time, due to the short developing time of the electric FSAE racing competition in China, there is almost no literature of regenerative braking system research on FSAE racing car. Therefore, the research in this paper also has a theoretical reference value.