Parameters Matching And Driving Control Strategy Research Of Powertrain System For Range-Extended Electric Vehicle

The Range-Extended Electric Vehicle(R-EEV) contains two power sources known aspower battery and Auxiliary Power Unit (APU). Powertrain system is uncoupled with enginewhich works only for electricity generation without driving. In this case, the engine runs inefficient operating points to reduce fuel consumption and improve the emissions. The twopower sources can cooperate rationally by good control strategy which carries out rationalallocation of energy by identifying driving intentions accurately to ensure the efficientoperation of powertrain system components, prolong battery service mission, increasevehicle driving range and improve its operational reliability.Combining with the actual project’s need, this paper completes parameters matching,analyzes the operating characteristics of powertrain system components. On the basis of thisdriving control strategy is established. Then verify parameters matching and driving controlstrategy on AVL_CRUISE and SIMULINK co-simulation platform. Vehicle control systemdesign is completed eventually. The thesis’s main research contents include:1. Based on the analysis of similar products from domestic and overseas, conform thepowertrain system design scheme of target vehicle. Complete parameters matching and typeselection of primary powertrain system components according to vehicle design demands.Analyze the operating characteristics of driving motor, power battery and APU to establishthe foundation of driving control strategy designing, vehicle dynamics and driving controlstrategy modeling.2. According to battery’s SOC and fault state, the R-EEV’s driving process is dividedinto CD mode, CS mode and limp mode. Taking the different powertrain system outputcapability of different modes into account, develop motor torque control strategy fordifferent modes. Design constant power control strategy in CS mode.3. Using AVL_CRUISE, build R-EEV’s dynamics simulation model. At the same time,complete the driving control strategy’s implementation in MATLAB/SIMULINK, includingdriver requirement module, driving mode judgment module, APU control module, energyconsumption module and Cruise Interface module. Accomplish simulating calculation ofcontrol strategy, dynamic performance, economical performance in CD mode and CS mode. Simulation results show the rationality of parameters matching and effectiveness of drivingcontrol strategy.4. Accomplish function definition of vehicle control system, signal demand analysis,CAN network design, vehicle controller’s hardware and software design. The function ofvehicle control system software contains vehicle power on and off management, control of CDmode and CS mode, APU failure diagnosis and treatment, management of electricaccessories.