| Cars have become an indispensable part of people’s lives,but with the rising number of traditional fuel vehicles,they bring fossil energy consumption,environmental pollution and greenhouse gas emissions are becoming increasingly serious.In order to ensure energy security,achieve energy conservation and environmental protection,and promote the technological revolution of the automobile industry and industrial transformation and upgrading,more and more countries are planning to develop new energy vehicles.Hybrid vehicles are an important part of new energy vehicles,and according to the"Energy Saving and New Energy Technology Route 2.0"developed in 2020,it is predicted that in 2035,energy-saving vehicles mainly hybrid vehicles in will account for 50%of total vehicle sales.In this paper,the hybrid power system is used as the object of research,taking the opportunity of the enterprise to conduct research and development of a model of hybrid vehicle.In order to make the hybrid vehicle equipped with this hybrid power system achieve the set power and economy goals,the hybrid power system is matched with the design and energy management strategy selection and design to the main research content and conclusions are as follows:(1)According to the design objectives of this hybrid vehicle and comprehensive its market positioning,the preliminary selection of the dual-motor hybrid system configuration was made by analyzing and studying the advantages and disadvantages of various hybrid power system configurations.Further,the advantages and disadvantages of energy management strategies were analyzed and studied for the domestic and international two-motor hybrid systems.(2)Starting from the customer’s requirements,we analyzed and decomposed the customer’s requirements in detail,selected the system configuration suitable for the hybrid vehicle-the hybrid twin-motor P1P3 configuration,and introduced the structure and principle analysis of the HEV hybrid transmission of the P1P3 configuration.According to the specific customer performance target requirements,the engine,generator,drive motor,battery and transmission are selected and matched with parameters,and the types and parameters of each major component are determined.(3)Through the analysis of different energy management strategies,a strategy based on threshold values more suitable for the actual control of the whole vehicle was selected.According to the hybrid system parameters in this paper,the threshold values for different mode switching are set based on the traditional threshold value strategy,and the traditional threshold value strategy is improved based on the equivalent fuel consumption minimization strategy(ECMS)to obtain the new threshold values for each mode switching.(4)By combining forward simulation and inverse simulation,a system fuel consumption simulation model is established using MATLAB/Simulink~?,which mainly includes driver model,HCU model,engine model,motor model,battery model,transmission model,and vehicle model,and combines the control strategy based on hybrid energy management strategy with the control model and physical model of each component together.(5)The comparative simulation of the two control strategies under NEDC and WLTC conditions is carried out respectively.The results show that for the HEV hybrid model of P1P3configuration in this paper,the ECMS-based optimized threshold energy management control strategy proposed in this paper can better improve the fuel economy.The ECMS optimized threshold energy management strategy proposed in this paper has certain fuel saving advantages over the traditional threshold strategy,and the fuel saving rate reaches 4.9%under WLTC conditions,and the strategy is suitable for the current real vehicle use and has certain application value. |
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