A research on SOC retaining-based energy management strategy for PSHEV

Aiming at the high drive power demand of heavy parallel-serial hybrid electric vehicle (PSHEV), an energy management strategy based on battery state of charge (SOC) maintaining is studied. With the strategy, energy management and distribution are conducted according to the requirement of maintaining battery SOC at a relatively high level for the battery having higher power and energy margin to enable electric motor to assist the engine with higher power in longer time at a working condition demanding high drive power such as hard acceleration, achieving higher power performance indicator of heavy vehicles. On these bases the ECU is designed with a corresponding program code written, and a simulation is performed with a dSPACE-based hardware-in-the-loop simulation system. The results indicate that the control algorithm can realize the energy management function and the expected battery SOC keeping target of PSHEV while meeting the basic requirements, including fuel economy and vehicle drive.