Design And Simulation Research Of Fuel Cell Hybrid Electric Bus Based On Actual Road Conditions

In recent years,with the increasing use of oil resources,the problem of resource shortage and environmental pollution has been paid more and more attention by the society,making it one of the serious problems that modern society must face.In order to solve the problem of energy shortage and environmental pollution,new energy vehicles are more and more popular.With the characteristics of zero emission and high efficiency,fuel cell hybrid vehicle has become one of the important ideas to solve the above problems.Based on the current development trend of heavy-duty commercial vehicles and the requirements of energy conservation and emission reduction,this study specifically analyzes the research progress of hybrid commercial vehicles,and determines that the fuel cell hybrid course is the research object,focusing on vehicle powertrain matching,energy management strategy design,vehicle model simulation and key component optimization,and mainly carries out the following work:(1)Firstly,based on the Beijing bus remote monitoring platform,the working condition data of the typical bus routes are collected,and the method of macro statistics and short distance cutting is used to analyze the working condition characteristics.The data of maximum speed,average speed,operation time,acceleration and deceleration,and idle ratio are determined.(2)According to the regulations and the statistical characteristics of the actual road conditions,the whole vehicle design index of the fuel cell hybrid bus is determined,the power system topology of FC + B is determined through comparative analysis,and the key components are selected and matched.(3)The current mainstream energy management strategies are compared and analyzed.Based on MATLAB \ Simulink environment,a power following energy management strategy with fuzzy control is built.(4)Based on AVL cruise platform,the whole vehicle model of fuel cell hybrid bus is built.The simulation analysis is carried out using CCBC,chtc-b and actual road conditions respectively.The SOC state of power cell,working efficiency of driving motor and output power of fuel cell under different conditions are studied,and the key components are optimized and analyzed in combination with the actual road conditions.Based on the above work and research results,the following conclusions are drawn:(1)Compared with the regulation condition,the maximum speed of the vehicle is about85 km / h,the average speed is 30 km / h,and the running time is more than 5h under the actual road condition;(2)The simulation results show that,compared with the regulation condition,the actual condition of the vehicle changes more violently,and the driving motor working point covers a wide range.With the change of the condition,the hydrogen consumption rate increases,and the SOC of the power battery changes dramatically,the braking energy recovery ratio is more than 9%.