| Regenerative braking function is one of the significant functions of hybrid electricvehicles compared to the traditionalones, When braking the vehicle, throughregenerative braking can generate some of the required braking force of the vehicle. Itcan ensure the safety of vehicle braking, convertthe braking energy of the vehicle intoelectrical energy through the motor/generator,and then storethe energy in the batterypack to achieve energy recovery.In this way, it will not only achieve the braking ordeceleration of the vehicle, and caneffectively reduce vehicle fuel consumption andemissions, while also reducing brake wear of the friction plate.When Plug-in Hybrid Electric Vehiclewith CVT is in the braking situation, it canchange the speed ratio of CVT continuously.In this way, it can make the motor work onthe most efficient region by adjusting the ratio of CVT to adapt to the rotate speed ofmotor, therefor itcan reclaim energy mostly.Focus onPlug-in Hybrid Electric Vehicle with CVT, the theoretical researchingandsystem simulation have been completed in this paper. The main results are as follows:①Based on the analysis of traditional vehicle braking dynamics, considering thecharacteristics of quick charging lithium batteries, ISG motor efficient power generationcharacteristics and engine anti-drag effect on the regenerative braking system, aregenerative braking control strategy for plug-in hybrid electric vehicle with CVT isproposed after compared two different strategy.②According to the analysis of plug-in hybrid electric vehicle structure,thestructure and the limited conditions of regenerative braking system are analyzed.Theevaluation indexes forregenerative braking system performanceof plug-in hybridelectric vehicle has been confirmed to to facilitate simulation and analysis.③Based on the analysis of the quick charging characteristic of lithium batteries,theinfluence of temperature and SOC of battery efficiency,and the ISG motor efficiency,angenerating optimal working line with high efficiency combined battery with motor isaccessed.According to the optimal working line,a CVT ratio control strategy areproposed during braking.④Based on backward modeling idea, according to bench experiment data of theengine、ISG motor and Lithium battery, combined with numeric modeling and theorymodeling, backward simulation model for regenerative braking system of plug-in hybrid electric vehicle with CVT is built.⑤The regenerative braking system modelsare simulated under the normal brakingand the typical city driving cycles. the models are simulated in the condition ofcombined battery with motor working together with high efficiency,and then comparedwith the result of simulating in the condition of motor working lonely with highefficiency. Simulation results show that the regenerative braking control strategy in thispaper can satisfy the safety requirements during braking，andthe generating efficiency ofcombining battery with motor working together with high efficiency is higher than themotor working lonely with high efficiency.So the recovery of braking energy is higher. |
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