Research On Energy Management Control Strategy Of Extended-range Electric Vehicle

With the shortage of petroleum resources and the increasingly serious environmental pollution problems,electric vehicles have become a research hotspot in the automotive field.As the power battery technology has not broken through the bottleneck,the driving range of pure electric vehicles is short,and it is difficult to popularize at this stage.Extended-range electric vehicles combine the advantages of long-term driving mileage of traditional vehicles,and the advantages of using electric energy to drive clean and efficient of electric vehicles,which is the ideal transitional model.Avoiding over discharge of the power battery and thus prolonging its service life is one of the key issues in the energy management strategy of the extended-range electric vehicle.Therefore,in view of the operating characteristics of the extended-range electric vehicle,this paper proposes an energy management control strategy for the range extender to compensate for the discharge of the power battery and conducts research on it,which has important academic significance and engineering value for deepening the research on the control theory of the electric vehicle and improving the overall performance of the extended-range electric vehicle.The main research contents of this article are as follows:First of all,aiming at the short driving range of current pure electric vehicles and the imperfect condition of public auxiliary facilities,this article uses JAC iEV6 E pure electric vehicle as the research object,and converts it into an extended-range electric vehicle by adding a small range extender,and according to the performance index,the power components were selected and matched.Secondly,according to the direction of energy flow,the operating mode of the extended-range electric vehicle is divided into six types,and each model is analyzed in detail.Using the characteristics of the extended-range electric vehicle with two power sources,an energy management control strategy for the range extender to compensate for the discharge of the power battery was proposed,and a detailed control flow was formulated.Then,based on the design goals,the ADVISOR's own power component model was modified.The energy management strategy model of the range extender to compensate for the power battery discharge was built in MATLAB/Simulink and embedded in ADVISOR,completing the secondary development of ADVISOR.Simulations show that this control strategy can achieve a reasonable power distribution,ensure that the battery's State of Charge(SOC)is within the set charge range,and the power and economy of the vehicle meet the design requirements.Finally,with the mileage as a constraint,the battery power is reduced to the lower limit of the charge range.The model is optimized by controlling the closing time of the range extender.The optimization results show that take 160 km as a driving target,the SOC control parameter when the engine is closed ahead of time is 0.399.Compared with the strategy before optimization,the operating time of the extender is reduced by 57.55%,and the electric energy obtained from the external power grid can be fully used,helps reduce fuel consumption and exhaust emissions.