Study On PHEV Power System Matching And Control Strategy Based On Hybrid Energy Storage

With the increasing global energy crisis and environmental pollution,countries around the world are looking for and trying various methods to reduce the fuel consumption and emission pollution of traditional fuel vehicles.Therefore,new energy vehicles have become a research hotspot for major universities and automobile companies.Today,the technical bottleneck of pure electric vehicles has not yet been broken.Plug-in hybrid electric vehicles(PHEV)have attracted much attention as a transition product of traditional fuel vehicles and pure electric vehicles.Although PHEVs have both the advantages of long mileage of traditional fuel vehicles and the advantages of energy conservation and environmental protection of pure electric vehicles,PHEVs that still use a single battery as a power supply still have many shortcomings.Due to the complex and diverse driving conditions,the batteries are often subject to high currents.The impact causes overcharge and overdischarge,greatly reducing the service life of the battery and reducing the economical use of the PHEV.In order to reduce the charge and discharge current of the PHEV battery,the supercapacitor was added to the PHEV battery based on the previous research on the single-battery-powered PHEV to provide a hybrid energy storage system to provide electricity to the PHEV.This paper analyze and research with engine,drive motor,battery and super capacitors of PHEV power system.and match the parameters of the vehicle’s power system,so as to obtain the parameters of each power system component.In order to keep the remaining power of the battery in a certain range and avoid the danger of overcharging and discharging the battery,based on the matching of the power system parameters,this paper formulated a power-following energy control strategy,including the control strategy of the vehicle’s torque distribution.And hybrid energy storage system current distribution control strategy to optimize the PHEV power system and control the battery charge and discharge current.Using MATLAB / Simulink software platform and LMS AMEsim software platform to establish the vehicle control model and vehicle physical model for joint simulation,and then using the software automatic code generation embedded code to download to the VCU.The NI hardware-in-the-loop test platform was used for experimental verification to complete the research and feedback optimization of the vehicle control strategy.The joint simulation and experimental results show that the parameters of the power system are reasonably matched,and the proposed control strategy can effectively switch the PHEV power source,effectively control the charge and discharge current of the battery,and achieve the design goal.