Fuel Cell City Bus Power System Design And Energy Management Strategy Research

Research and development of fuel cell vehicles is one of the major projects in China's new energy development strategy.It integrates various advanced technologies such as fuel cell technology,motor control,body and chassis design,testing and system optimization.Especially,the design of vehicle power system,vehicle model and energy management strategy are the key and difficult technologies for fuel cell vehicle.These technologies can improve the operational efficiency and the economy of the entire vehicle system,and benefit to the vehicle design.This paper explores the design of the vehicle's powertrain,vehicle model and energy management strategy based on the new PEMFC city bus.The following work is carried out.Firstly,the hybrid power structure of FC+B for the fuel cell city bus is determined through comparative analysis of various types of fuel cell vehicle power system structure.The power system components are selected and calculated and the power system matching is completed.Secondly,the whole vehicle of the hybrid power system and components are analyzed on the basis of the modeling theory.Using ADVISOR simulation software,the fuel cell model,battery model,drive motor and controller model and the fuel cell city bus vehicle model are established.Thirdly,this paper compares the energy management strategies of thermostat mode and power-follower mode,and a 2-input-1 output Mamdani-type fuzzy control energy management strategy is designed based on fuzzy control theory.The fuzzy control energy management strategy model is built based on MATLAB/Simulink platform.This model can be embedded and called by redeveloping the ADVISOR software.Finally,the power-follower and fuzzy control energy strategies simulation is performed based on the typical urban road cycle conditions of China.The vehicle dynamic performance can fully meet the set performance indicators under two energy management strategies.The adaptability of the fuzzy control energy management strategy is superior to the power-follower energy management strategy in this condition.The power performance and fuel economy of the whole vehicle have been improved.The rationality and effectiveness of the fuel cell city bus hybrid power system are verified.