Energy Efficiency Analysis Of Hybrid Electric Bus Under Drive Cycles In Heilongjiang Province

With energy shortages and air pollution worsening worldwide,electric cars are booming.As a kind of pure electric vehicle with high efficiency,zero emission and minimal noise pollution,it has been concerned by the society and listed as an important direction for the rapid development of new energy vehicles.Currently on the market is relatively common pure electric vehicles,its mostly USES the lithium ion battery energy storage system,however,in terms of energy density,power density and durability of the lithium battery is not fully meet the demand of pure electric vehicles run all condition,especially in large ratio to charge and discharge conditions,large current shock for a long time will affect its performance,reduce the service life on the great degree.At this time,the energy density is much higher than that of the battery,and the operating temperature range is wider.Ultra capacitors with long cycle life are gradually coming into our sight.The advantages of ultra-capacitors can make up for the shortage of batteries to some extent.Firstly,this paper analyzes the battery,super capacitor,DC/DC converter between the more common way of four kinds of connection,and from the perspective of the cost,complexity and controllability and so on into consideration,choosing the super capacitor in series DC/DC converter in parallel with the battery configuration,and the lithium battery and super capacitor and motor energy flow direction of the four kinds of working mode was introduced in detail.Secondly,this paper selects cities from the characteristics of population distribution and urban geographical location of Heilongjiang province,and selects typical bus lines according to the characteristics of each city.Preprocessing of the data collected in the candidate segment,the candidate segments by principal component analysis and cluster analysis,constructed on the basis of Harbin,Jiamusi,Mudanjiang city,Heilongjiang province,typical city bus driving cycle development in Heilongjiang province and city bus in the province road condition and the comparative analysis of China's urban bus typical conditions.Finally,based on ADVISOR/MATLAB,the lithium battery model,ultra-capacitor model and DC/DC converter model were constructed to form a composite power supply model.At the same time,the vehicle model was built,and the values of relevant parameters were defined for simulation analysis.On this basis,the energy efficiency analysis of hybrid electric bus is carried out under the working conditions of bus cities in Heilongjiang province.