Battery Electric Vehicle's Driving Cycle in Mountain Environment Based on Big Data
In view of the trend of battery electric vehicles increasing,it is no longer applicable to use traditional fuel vehicle's driving cycle for battery electric vehicle's driving cycle research.In order to obtain the driving cycle of the battery electric vehicle and compare with the traditional driving cycle from the data point of view,firstly,according to the driving data of the battery electric vehicle in Chongqing area,by using the whole vehicle and battery data of the proprietary big data platform,the short-stroke method is adopted to screen out the kinematic fragments.Then,the feature of kinematic fragments is constructed by the correlation method of feature engineering,and the dimension of high-dimensional feature data is reduced by principal component analysis and the feature weight is calculated to eliminate the influence of feature correlation.Next,K-means+ + clustering method is used to partition the structure of the driving speed and battery current curves,and thus to construct 4 types of working conditions of low speed,medium speed,medium-high speed and high speed.Moreover,the most suitable short-time working conditions are selected by sorting the distance of each working condition with the cluster center as the origin,the ratio of the total duration of the data set to the total duration of the data set is taken as the weight of the data set.Then,through the error analysis,the characteristic deviation error of the smallest curve is selected as a representative of the working condition,so as to determine the representative of the vehicle and battery working conditions.Finally,the reliability of battery electric vehicle operating curve in mountain environment is proved by comparing the international and domestic typical operating conditions.The result shows that(1)compared to non-mountainous environments,in mountain environment,pure electric vehicles have shorter constant speed driving times,longer idling times,greater deceleration and a smaller proportion of deceleration time;(2)battery discharge efficiency is higher,and the vehicle speed is maintained at a moderate level.
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