Research On Energy Management Control Of PHEV With Hybrid Energy Storage System And Dual Rotor Motor

Plug-in Hybrid Electric Vehicle(PHEV)has become one of the research hotspots in the automotive industry due to its advantages in energy conservation and emission reduction.With the gradual improvement of people’s requirements for the economy,power,and other performance of PHEV,higher requirements have been put forward for the performance of energy source and motor used in vehicle.Therefore,the Hybrid Energy Storage System(HESS)and Dual Rotor Motor(DRM)for vehicle have gradually attracted people’s attention.HESS can meet the high-power demand of vehicle in pure electric drive through supercapacitor,significantly reducing the discharge rate of power battery,thereby effectively extending the lifespan of power battery.DRM has a higher power density and work efficiency than traditional motor.Due to the application of HESS and DRM in PHEV,the number of power and energy sources in PHEV has increased.Therefore,reasonable energy management control is one of the key technologies to ensure that the advantages of HESS and DRM are fully utilized.For this reason,this article focuses on PHEV energy management control and conducts research on the following aspects:(1)Based on the analysis of the topology structure of the HESS and the principle of the DRM structure,a powertrain configuration of the hybrid electric vehicle with HESS and DRM(HD-PHEV)was proposed,and the power source working mode was designed.Based on the basic parameters of the vehicle,the required power and energy of the vehicle were analyzed,and the parameter matching of key components of the powertrain was completed.(2)Based on the parameter matching results of powertrain components,the HD-PHEV vehicle modeling was completed using AVL Cruise software.The modules of engine,power battery,and supercapacitor were modeled using existing modules in the software.In response to the lack of the DRM module in the software and the inability of the existing DC/DC converter module to meet the efficiency characteristics of usage requirements,based on the working principle of the DRM and the efficiency characteristics of the DC/DC converter,a combined modeling was conducted using the existing modules in the software.(3)Based on the powertrain configuration of HD-PHEV,the basic design principles for the energy management strategy of HD-PHEV had been clarified.Based on the working mode of power source,a rule-based power source control strategy was proposed,including the calculation of driving and braking demand torque,power source demand torque distribution,and power source working mode switching.The sequential quadratic programming(SQP)algorithm was used to optimize the drive torque distribution of DRM.Based on dynamic programming(DP)algorithm,the power allocation of HESS power under typical working condition was optimized.The power allocation rules were summarized from the optimization results,and a rule-based control strategy for HESS power was proposed based on the allocation rules.Finally,the energy management control model was built based on Matlab/Simulink software.(4)A model in the loop simulation platform was built based on AVL Cruise and Matlab/Simulink software to validate the energy management strategy from five aspects:vehicle power performance,power source control effect,HESS control effect,condition adaptability,and vehicle economic performance.The simulation results show that the power performance and pure electric driving range of the vehicle meet the design requirements.The control effect of power source and HESS are good.The vehicle has good condition adaptability.The fuel consumption per 100 kilometers of the engine is reduced by 18.93%.To sum up,the effectiveness of the energy management strategy has been verified.