Multi-factor integrated parametric design of power-split hybrid electric bus

The power-split hybrid electric system is currently the most promising hybrid system. This study proposes a multi-factor integrated parametric design method for a power-split hybrid electric bus (HEB). This method considers the power source efficiency (i.e. the engine, motor and generator), transmission efficiency, vehicle driving cycle requirements, and primary control strategy. The design method is then applied to a specified city bus. System efficiency is analyzed, and the control strategy is determined. Finally, the parametric design method is validated on the co-simulation platform of Matlab/Simulink and Cruise. Results show that the fuel economy of the power-split HEB that adopted the proposed parametric design is 36% better than that of the conventional city bus.