An Energy Management Strategy for Through-the-Road Type Plug-in Hybrid Electric Vehicles

This article proposes an energy management strategy for a through-the-road (TTR) plug-in hybrid electric vehicle (PHEV) to achieve efficient fuel consumption performance. The target hybrid powertrain includes an electric traction motor, an integrated starter/generator (ISG), and a gasoline internal combustion engine (ICE) in the front axle and another electric motor in the rear axle. The energy management strategy is organized into six functional modules. The power mode is determined by the driver’s pedal demand, vehicle states, and the characteristics of the related power units to increase the overall system efficiency. The energy management strategy and the vehicle models are established in the Matlab/Simulink by using dSPACE Automotive Simulation Models (ASM) software. The proposed strategy is examined in terms of three test scenarios in the Model-in-the-Loop (MiL) simulations. The vehicle operates in the EV mode in the range from 40% to 70% battery state of charge (SOC) to improve the fuel consumption. The ICE is ignited to charge the battery if SOC is under 40%. In the acceleration simulation, the ICE involves in the power output to compensate the required acceleration torque when the vehicle speed is over 80 kilometers per hour (kph). The simulation results show that the fuel consumption is computed as 77.34 miles per gallon (MPG) by adopting the proposed energy management strategy.