Powertrain Parameter Matching And Optimization Of Powertrain System For Range Extended Eletric Vehicle

With the support of relevant policies,new energy vehicles are developing rapidly.However,there are a lot of problems with pure electric vehicles,such as the service life of the power battery,the cost,the battery energy density and the difficulty in charging,making the endurance mileage and the cost of the vehicle important factors hindering the development of the pure electric vehicles.With its superiority in terms of power,the Extended Range Electric Vehicle has become a new energy vehicle product with potential for development,especially in the bus industry,where companies are paying more attention to the Range Extended Electric Buses and increasing investment in the research and development.But the problems of higher fuel consumption and powertrain costs still exist for the Range Extended Electric Buses with the higher power APU(auxiliary power unit).Firstly,in this paper,the parameters of the vehicle power system were matched,including the drive motor,the battery and the auxiliary power unit,according to the structural arrangement of the vehicle powertrain,power performance and the driving condition requirements for the target vehicle.The vehicle model is built on the AVLCRUISE software,and then the validity of the parameters matched to the selected components is verified by joint the simulation with the Matlab/Simulink.Secondly,the parameters set for the powertrain components were optimised based on a combination of genetic algorithms and AVL-CRUISE and Simulink simulation,with the aim of lowering the vehicle manufacturing cost and improving the fuel economy under the constraints of the vehicle’s power performance.Finally,according to the optimised powertrain component parameters,the suitable powertrain components are selected in conjunction with the supplier’s components availability status.Based on the vehicle control logic and control module requirements,the APU and the vehicle were assembled,and the commissioning of the components was completed in the laboratory and the test verification of the whole vehicle was completed at the customer’s site,the actual test showed that the whole vehicle achieved the target of the fuel consumption reduction.In summary,this paper has designed and produced a higher extended range city bus with further the reduction in manufacturing cost and the fuel consumption through the rational selection and the operation optimisation of the vehicle power system parameters,which has met the customer’s demand and expanded the market of the Extended Range Electric Bus.