Research On Torque Coordinated Control Strategy For Plug-in P2 Hybrid Electric Vehicle

The problems of energy consumption and air pollution caused by traditional fuel vehicles are attracting more and more attention,and all kinds of new energy vehicles are gradually changing from concepts to products,among which,the Plug-in P2 Hybrid Electric Vehicle enhance the whole vehicle operating efficiency and save energy and reduce emissions significantly by exerting the respective performance advantages of internal combustion engine and electric motor.This paper mainly studies the torque coordination control of dual power sources of HEV through modeling and simulation.The research of this thesis is supported by the Xi'an Science and Technology Projects of "Development of No-joint Wire Rope CVT for Hybrid Electric Vehicle".Starting from the structural characteristics of the plug-in P2 hybrid vehicle,combined with the operating characteristics and parameters of each component,the model of Plug-in P2 HEV(including vehicle dynamics model,engine model,motor model,power battery model,clutch model and CVT model)is modeled.By analyzing the operation modes and switching conditions of HEV,set a series of logical threshold parameters:engine optimal torque,SOC upper and lower limits,etc.,to establish the torque coordination control strategy based on the logical threshold,and the MATLAB/Simulink platform is used to build a model of the torque coordination control strategy based on logical threshold.The simulation model is established in AVL CRUISE,and the effectiveness of the control strategy is verified by the joint simulation of MATLAB/DLL interface in CRUISE.On the basis of the strategy of torque coordination control based on logic threshold,the operation mode is simplified properly,fuzzy control is introduced to optimize the torque distribution in the driving charging and hybrid drive modes,and the joint simulation is used to verify the improved strategy of torque coordination control,and the simulation results based on logic threshold are compared and analyzed.To address the torque coordination problem of power source switching in the mode switching process of HEV,the torque coordination control strategy of mode switching is designed to improve the ride comfort of the whole vehicle.With the help of simulation,the effectiveness of the mode switching torque coordination control strategy is verified.The results show that the fuzzy control-based torque coordination control strategy reduces fuel consumption per 100km by about 5%compared with the logic threshold torque coordination control strategy,and the mode switching torque coordination control strategy also effectively reduces the jerk of the mode switching process.The research in this thesis helps to solve the problem of coordinated torque control of dual power sources of HEV and lays a certain theoretical foundation for further improving the energy-saving effect and the vehicle ride comfort of HEV.