Research on Double Fuzzy Control Strategy for Parallel Hybrid Electric Bus

In this paper, a double fuzzy control strategy (DFLS) for parallel hybrid electric bus (HEB) is proposed. Firstly, the basic parameters of HEB is designed. Then, the single fuzzy logic control strategy (SFLS) is proposed based on the parameters. SOC and torque demand scale factor are taken as the input of fuzzy controller. Combining with the braking energy recovery strategy, this paper proposes a double fuzzy control strategy, which is taken SOC, required torque and bus speed as the input. And this paper makes a comparison of the both strategies in Chinese Bus Driving Cycle (CBDC) based on the simulation results.