Abstract: For development of fuel cell electric buses with multi-energy-source composite, taking multi-energysource composite of fuel-cell + power-cell + ultra-capacitor as research object, a vehicle mathematical model was built based on MATLAB/Simulink/Stateflow. Based on power index, economy index and characteristics of three energy sources, parameter matching and checking of multi-energy-source system were completed. Based on principle that fuel cell is main energy source, battery is auxiliary, and ultra-capacitor prevents overload of fuel cell and battery, control strategy of logic threshold was proposed. And simulation verification was finished under Chinese typical city circle and Changchun driving cycle. Simulation results show that maximum vehicle speed is 73 km/h, maximum climbing gradient is 22%, and acceleration time from 0 to 50 km/h is 16.7 s. Driving range under Chinese typical city circle is 263 km and that in Changchun driving cycle is 282 km and power and economic indexes of vehicle exceed design requirements.

Key words:  electric bus, multi-energy-source composite, fuel cell, parameter matching, control strategy, logic threshold