Research on compound management strategy of electrically driven vehicle power transmission based on rule-fuzzy logic

In order to reduce the peak torque of vehicles under frequent start-stop conditions and to address the shortcomings of traditional fuel-powered cars and electric vehicles, electric and hydraulic drive vehicles (MH-HEV) with multiple mode switching and brake energy recovery is proposed. The parameter matching of the power transmission system is completed, and a rule-based driving control strategy for the MH-HEV is established, enabling dynamic mode switching and energy management. A comparison with AME Sim-certified pure electric vehicles validates the feasibility and superiority of the MH-HEV. Furthermore, a fuzzy controller based on motor speed and accumulator pressure difference is proposed to optimize the logic threshold control strategy, reducing the peak torque of the motor while increasing the battery’s state of charge-SOC. This control strategy is highly suitable for the MH-HEV under frequent start-stop conditions.