Energy Management Strategy Considering Cabin Heating for Plug-in Hybrid Electric Vehicle

In this study, an integrated energy management strategy(IEMS) was proposed for a PHEV(Plug-in hybrid electric vehicle). The IEMS controls the engine on-off considering not only powertrain system(battery SOC, vehicle speed, accelerator pedal, brake pedal) but also thermal system condition such as cabin temperature. Analysis of the integrated powertrain and thermal system was conducted to enhance vehicle performances such as all electric driving range and fuel economy. To investigate the energy flow, the performance simulator was developed based on the integrated powertrain and thermal system model. The powertrain model is composed of the engine, motor-generators, power-split transmission, battery and vehicle dynamics, whereas the thermal system model is composed of the thermal engine, radiator, heater and cabin. From the simulator, the coolant temperature, cabin temperature, engine torque and engine speed were investigated. The developed simulator was validated by vehicle test results. It was found that the proposed IEMS satisfies the demanded cabin temperature while providing improved fuel comsumption compared with the existing energy management system.