关键词: PHEV；SOC；动态规划；能量管理

Abstract: Aiming at the problem of optimal control of fuel economy of plug-in hybrid electric vehicles (PHEV), the article proposes a global optimal control strategy based on dynamic programming algorithm to maximize its fuel saving potential. First, a mathematical model of the P2 configuration plug-in hybrid vehicle is established. Then, the optimal control mathematical model is established with the state of charge (SOC) of the battery as the state variable and the motor torque as the control variable. And the optimal control is solved by dynamic programming method with the minimization of engine fuel consumption as the objective function. The simulation results show that compared with the power consumption-holding strategy, the dynamic planning-based control strategy can reasonably allocate the engine and motor torque, and the engine fuel consumption is reduced by 24.91% compared with the power consumption-holding strategy, and the proposed strategy can significantly improve the vehicle fuel economy.

Key words: PHEV; SOC; Dynamic programming; Energy management