Real-time best efficiency control for parallel hybrid electric vehicle

In order to improve the powertrain efficiency in real-time and reduce the fuel consumption, a coordinated control strategy is presented in this paper to maximize the powertrain efficiency. According to the charging and discharging situation of the battery under different driving mode, the equivalent fuel consumption models are established. On the basis of deep analysis of the efficiency of the internal combustion engine (ICE) and the battery, a unified expression of the total efficiency is put forward, further a map of the power distribution factor under different power requirement and different state of charge (SOC) is constructed. According to the total efficiency formula acquired, a coordinated control strategy is proposed to distribute the required power between the internal combustion engine and the battery according to the optimal power distribution factor, this control strategy can be firstly computed off-line and then can be operated in real-time at a low computation cost. Simulation results are presented for two different driving cycles. The results show significant improvements in fuel economy and the real-time efficiency. © 2019, Editorial Department of Control Theory & Applications South China University of Technology. All right reserved.