Study On Matching And Control Strategy Of Extended-range Electric Vehicles Power System

Nowadays,with the exhaustion of resources and the increasingly serious environmental pollution,new energy vehicles have become one of the trends in the automotive industry.Because of the limitation of battery technology and the charging facilities,large-scale applications and promotion of electric vehicles seems to be rather slow.Extended range electric vehicle(EREV),as one of the automotive type at present with the advantages of long mileage,low emissions and fuel efficiency,become the ideal selection scheme of electric vehicle power system.reasonable power system and good Auxiliary power unit(APU)control strategy is the key to study and design of electric vehicles,but also the key to improve the vehicle performance.This paper takes EREV power system and APU as the research object,we studied the power system parameters matching and software modeling,and the control strategy of APU in-depth study.Firstly,this paper analyzes the structure and development of EREV,and the research status of APU control strategy,and puts forward the main content of this paper.Based on the vehicle system structure according to the index of the specified power requirements,the basic parameters of power system are calculated.The key components of the motor and the reducer are matching and selection,and further carried out on the APU parameter design.Based on the Cruise software established EREV simulation model needed,including drive motor,power battery,APU and other core components for the APU control strategy with single point temperature and power with multi point control,combined with the simulation software AVL Cruise and MATLAB for the whole vehicle dynamic performance and control strategy validation.The simulation results show that: the state of charge(SOC)during the entire cycle can be controlled at about 40%,but the single point temperature control range fluctuated significantly,while the fuel economy,power with multi point control better than single point temperature control.The maximum vehicle speed and acceleration time meet the requirements of the vehicle design under the two control strategies.In the NEDC condition,the core components of drive motor battery and APU working characteristic curve and the output is consistent with the theoretical requirements,verify the correctness,rationality and control strategy of power system,the application will providea reference for the development of EREV.