Global Sizing Optimization of the Traction System for an Uniaxial Hybrid Bus

In this paper, a bus potential work mode and power flow of power system are totally analyzed in consideration of the coupling of the power system parameter, energy management and target work cycle; and a hybrid powertrain system parameter optimization based on global optimal energy management strategy is proposed. Taking the fuel economy as the objective function, the vehicle power performance and the battery SOC final value as the constraint condition, the engine rated power, the main drive motor peak power and the main reduction ratio as optimized variables, and a parameter optimization model for bus hybrid power system is established. An optimization combining MIGA and SQP is designed to improve the optimization efficiency and quality. Through the optimization, the fuel economy is improved and the final parameters of a uniaxial hybrid bus are determined.