Energy Flow Analysis And Performance Simulation Of Battery Electric Vehicle

Recently,with the increasingly serious problems of global environment and energy resource,the battery electric vehicles have got more and more attentions of the vehicle manufactures and the global governments due to the high efficiency and zero emission,and it has became the research hot.The performance of battery electric vehicle is affected by the structure parameters,environment factors and the control parameters,in order to predict and study the effects of environment factors and control parameters on the performance of battery electric vehicles,a driving range experiment of battery electric vehicle is implemented and the test results are analyzed,and then the simulation platform of battery electric vehicle equipped with single pedal control strategy is developed based on the GT-Suite software.On the basis,the energy consumption and driving range of battery electric vehicle caused by different environment factors and control parameters are discussed,the main research contents are as follows.(1)The vehicle energy flow test is taken placed for a vehicle equipped with the single pedal control system,and the vehicle energy flow is analysed under the whole driving range,the typical driving cycle is picked up to calibrate the simulation model.(2)A simulation model for electric vehicle is constructed using the GT-Suite software,the simulation model shows relatively high accuracy:For the single driving cycle,the relative error of battery power and current is below 5%,and the relative error of battery voltage is below 1.6%.For the whole driving range,the relative error of driving range is only about 1.55%.(3)The impact of electric vehicle performance caused by single pedal control strategy is analysed,the results showed that,adding the intensity of motor regenerative braking during parallel brake process can recover more energy,but the effect is not evident and the main factors when setting the control strategy are the safety and comfort during the braking process.Furthermore,under the pledge of the driving safety and the efficiency of energy conversion,the threshold when the motor quits the regenerative braking mode during the braking process can be set as low as possible.(4)The energy consumption and driving range of electric vehicle caused by typical driving cycles showed that,the main factors influencing energy consumption and driving range are average vehicle speed,running time and frequency distribution during the braking process.Meanwhile,the energy consumption of congested traffic with/without regenerative brake control system are 46.07 k W·h/100km and 47.19k W·h/100km,respectively,vehicle with regenerative braking saves 2.43%energy under congested traffic.(5)Compared with the normal ambient temperature,the energy consumption of battery electric vehicle under low ambient temperature(such as-20,-10,and 0~oC)increases significantly,the efficiency of energy conversion under 45~oC is higher than that of 25~oC,but the lifespan of battery will decrease under high ambient temperature,thus the battery pack of electric vehicle needs to work at a fitting ambient temperature.Through the analysis of the performance of battery electric vehicle affected by the environment factors and control parameters,the simulation platform and data analysis results of this paper can provide important tools and reference for the development of high performance for battery electric vehicle.