Research On Parameter Matching And Control Strategy Of Powertrain Of Extended Range Electric Vehicle

With the increasingly prominent environmental issues and the promulgation and implementation of stricter emission regulations in various countries,this has continuously challenged the development of the automotive industry.New energy vehicles have good power and fuel economy due to their different powertrain structures and working methods from traditional vehicles.As a kind of new energy hybrid electric vehicle,extended-range electric vehicles are favored by many users and car companies.At this stage,engine technology has entered a bottleneck period.Some electric vehicle technologies need to be further developed.Due to its good power,fuel economy,emissions,and long cruising range,Range-extended electric vehicle is the ideal choice from traditional vehicles to pure electric vehicles.The main research content of this paper is based on the team’s extended-range electric vehicle development project,using a family car as a platform,and using a combination of theoretical analysis,experimental verification,and numerical simulation.The research work is mainly centered on the development of extended-range electric vehicles.Powertrain structure analysis,selection of powertrain components and parameter matching,vehicle model construction,and energy management strategy formulation and construction are carried out.(1)For the extended-range electric vehicle to be developed,the vehicle performance index shall be formulated in combination with the market and the relevant situation of the prototype vehicle,and the various components of the extended-range pure electric powertrain(engine,generator,generator,Power battery,drive motor and main reducer,etc.)for selection and matching and parameter calculation;(2)Build a vehicle simulation model in AVL-Cruise,add the component parameters of the matching calculation to the vehicle model for preliminary simulation,and verify the confidence of the model through the benchmark vehicle road test to verify the feasibility of the scheme;(3)Introduce the current control strategy of new energy hybrid electric vehicles,and compare and analyze the selection based on the logic threshold control strategy as the control method of the extended-range electric vehicle based on the actual project in the initial stage of the project.The working modes of the car are divided into power retention mode and extended range mode.At the same time,each mode is divided into five sub-modes according to engine start and stop and power: pure electric mode,on-vehicle charging mode,extended range direct drive Mode,hybrid drive mode and braking energy recovery.According to the selected control strategy,divide the engine working interval and build a control model in MATLAB/Simulink.The power holding mode adopts single-point constant temperature control,and the extended range mode builds three logic-based threshold control models,which are selected through the final joint simulation analysis,and select the more excellent control strategy.(4)The Cruise Interface co-simulation method is used to simulate the vehicle dynamics,fuel economy,and NEDC cycle driving range,and the vehicle performance reaches the set target value.By comparing and analyzing the three control methods based on logic threshold in the extended range mode,the single point constant temperature + power follow control is selected as the extended range mode control method.The simulation results prove the feasibility and necessity of the development of the extended-range electric vehicle.