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Research On Powertrain Matching And Control Strategy Of Plug-in Hybrid Electric Vehicle

Posted on:2021-05-31Degree:MasterType:Thesis
Country:ChinaCandidate:Z Q ZhengFull Text:PDF
GTID:2392330632954269Subject:Vehicle Engineering
Abstract/Summary:PDF Full Text Request
As a transitional product in the process of transforming traditional cars to pure electric vehicles,hybrid electric vehicles have become the focus of current research due to their characteristics of energy saving and emission reduction.For hybrid vehicle control,it mainly includes two types of control problems.One is the steady-state energy management control strategy to allocate multiple power sources.The other is the dynamic coordinated control strategy,which includes coordinated control during shifting,Coordinate control during mode switching.Based on a newly developed hybrid 10.5 m hybrid city bus project by a car company,this project carried out the determination of the vehicle-level goals based on the product development stage,the system selection and matching of the concept design stage,and the vehicle strategy model.Construction,vehicle dynamics and economy,shifting quality performance,to the final production preparation stage prototype vehicle test.The main contents are as follows:First,through a comparative analysis of the characteristics of hybrid vehicles with different architectures,the architectural form of the vehicle model developed in this subject was clarified.Based on product positioning,standards,regulatory requirements,and benchmark vehicle test analysis,the establishment of the vehicle-level target was completed.Based on this,matching analysis and selection of key components(engine,generator,electric motor,power battery,transmission)of the vehicle were carried out.Secondly,a vehicle energy management control strategy based on logical thresholds is designed,and the vehicle working mode is divided.Based on the calculation of the required torque of the entire vehicle and the optimal working interval of the engine as the theoretical basis,the torque distribution in the different working modes of the model studied in this subject is performed.Based on the energy management of the entire vehicle,the upshift and downshift processes of the second gear AMT were controlled at different stages,and the fuzzy PI generator speed was used to complete the power interruption.Principle,and finally,the vehicle speed is used as the variable of the shift rule,and a shift control strategy is established in Matlab/Simulink.Then,the vehicle performance simulation analysis software Cruise and the control system software Matlab/Simulink were used to establish a hybrid 10.5m hybrid city bus simulation model.The vehicle power and economy are simulated and analyzed.The vehicle energy management control strategy and AMT The shifting strategy is analyzed and evaluated.The results show that the matching and selection results of key components of the vehicle are reasonable.The developed vehicle energy management control strategy improves the fuel economy of the vehicle.Finally,using the hub test bench,according to the procedures of the vehicle test test,the vehicle hub test was carried out,and the comparative analysis between the test results and the simulation results was completed to verify the accuracy of the simulation,provide theoretical basis.
Keywords/Search Tags:hybrid city bus, matching selection, energy management control strategy, AMT shift control strategy, vehicle test
PDF Full Text Request
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