Research on energy optimization control strategy of the hybrid electric vehicle based on Pontryagin's minimum principle

An energy optimization control strategy for the Hybrid Electric Vehicle (HEV) is developed in this paper to reduce the fuel consumption, on the premise of the operation demand, which makes the engine and motor working in the high efficiency operation area. The energy management model of Pontryagin's Minimum Principle (PMP) for the parallel hybrid vehicle is set up, the state of charge (SOC) and the output power of the battery are chosen as the state variable and control variable, respectively. The total fuel consumption during the HEV operation is considered as the objective function, and PMP is used to obtain the optimum solution. The simulation results verify the effectiveness of the developed control strategy, with which the higher output torque of the engine and the lower output torque and higher efficiency of the motor are achieved compared with the energy management strategy based on logic rule. Moreover, the 100-kilometer fuel consumption is reduced by 40%, and the fuel economy is greatly improved.