Energy Management And Control Of Hybrid System For Heavy Vehicles Driven By In-wheel Motors

With the development of human society and the advancement of science and technology,people have higher requirements for the performance of heavy vehicles than before.At present,the system scheme combining hybrid power and in-wheel motor drive is an important research direction of heavy vehicles.It is very obvious for the mobility,transportation efficiency,fuel economy of heavy vehicles.Among them,the energy management and control strategy of hybrid vehicles is the core and difficulty of vehicle design and development.It has a vital influence on vehicle dynamics,economy and emissions,and has become one of the research hotspots in the field of hybrid vehicles today.The design and simulation of energy management and control strategy based on 8×8 in-wheel motor driving heavy hybrid vehicle are carried out in this paper.The main work contents are as follows:1.According to the vehicle parameters and performance indicators,the main components of the hybrid system,such as the engine,ISG motor,and in-wheel motor,are selected and parameter matched.Firstly,the series hybrid structure is selected as the whole vehicle transmission scheme.Then analyze and design the working mode of the hybrid vehicle.The goal is to make the APU as the main power source to provide long-lasting energy for the whole vehicle operation.The battery is used as the auxiliary energy source,and it works when the demand power is large or silent.Supercapacitors provide high-power auxiliary power storage for the start-up and acceleration of a car.They quickly recover and store energy when the car is decelerating,descending and braking.Finally,the main components are selected according to the vehicle parameters,performance indicators and hybrid vehicle working mode and the main parameters are calculated.2.Design,model establishment and joint simulation analysis of energy management and control strategies.Firstly,this paper chooses the rule-based logic threshold control strategy,designs its energy management and control strategy based on the operating conditions and working modes of the hybrid vehicle,and builds the energy management control model through MATLAB/Simulink software platform.Then the vehicle model is built by CRUISE software platform,and use its MATLAB DLL interface module to realize the joint simulation of MATLAB energy management control model and CRUISE vehicle model,set dynamic simulation calculation task and cycle working condition simulation calculation task to get the whole vehicle dynamic,economic and emissions results.3.Get joint simulation results and analyze the results.Firstly,the dynamic simulation results are obtained,including the maximum speed,0-60km/h acceleration time and maximum grade.The simulation results show that the hybrid vehicle meets the design requirements of the vehicle.Then,the simulation results of the cycle conditions are analyzed,including the mileage of the vehicle's 40km/h silent drive,the fuel consumption of the UDC,Highway,CWTVC cycle conditions.The energy results of the main power components in the C-WTVC cycle are statistically analyzed to verify the rationality of the energy management and control strategy and the correctness of the model.