Abstract
Taking supercapacitor and battery pack as the energy storage unit, a novel type of regenerative braking system for electric vehicle driven by in-wheel motors is presented, and a braking energy regeneration control strategy is set up. Then, a co-simulation test based on CRUISE and Simulink is conducted. The results of simulation show that the novel type of system can ensure the safety of battery pack and significantly improve the rate of energy regeneration.
Highlights
Because of environmental pollution and energy crisis, it is inevitable for the wide application of electric vehicle (EV) to realize sustainable development of the world.[1]
The technology of EV driven by in-wheel motors devoid of the traditional mechanical transmission design constraints adopts the flexible cable among power producer and driven motors, which becomes the focus of automotive technology research.[2]
In Gao et al.,[9] the efficiency of regenerative braking in the case of three different braking conditions was evaluated, and the results indicated that a great amount of braking energy can be recovered
Summary
Because of environmental pollution and energy crisis, it is inevitable for the wide application of electric vehicle (EV) to realize sustainable development of the world.[1]. A new type of regenerative braking system taking battery pack and supercapacitor as energy storage is presented for a higher rate of braking energy recovery in EV driven by inwheel motors. The configuration of the regenerative braking system is shown in Figure 1; the system comprises in-wheel motors, direct current (DC)/DC controller, battery pack, and supercapacitor. According to the Kirchhoff law and the charging and discharging characteristics of supercapacitor, the terminal voltage of the supercapacitor can be expressed by the following formula if icap represents the discharge current in the case of discharging[16]. The SOC of the supercapacitor refers to the ratio of energy stored in the supercapacitor corresponding to the terminal voltage Vcap at one point and that corresponding to the terminal voltage VC2r when the supercapacitor is fully charged The function relationship can be obtained by fitting the experimental data of battery pack
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