Research On Mechanical-Electrical-Magnetic Integrated Braking Mode And Control Of Large Parallel Hybrid Electric Bus

The large parallel hybrid electric bus can effectively relieve energy dilemma and environmental pollution.As one of the important carriers of public transportation,braking stability and safety should be paid highly attention to.The large parallel hybrid electric bus possesses three braking mode including air mechanical braking,energy regeneration braking,eddy current retarder braking,forming the large hybrid electric bus mechanical-electric-magnetic integrated braking system.The large hybrid electric bus mechanical-electric-magnetic integrated braking system according to braking condition,selecting relevant integrated braking mode,based on braking stability and energy recovery,carrying braking torque distribution way on different mode.To realize the large hybrid electric bus integrated braking,studying the connected factors of integrated braking system braking torque output is needed,designing braking mode,braking torque distribution algorithm and integrated braking controlling strategy.Hence,the major studying contents of this thesis are as follow:(1)The structure of air braking system,energy regeneration braking system and eddy current retarder braking system are analyzed,mathematical model and simulation model are built,the braking characteristics of “mechanical”,“electric” and “magnetic” braking system are studied,performance index of braking stability and energy regeneration on integrated braking system is proposed;based on mechanical electric magnetic integrated braking,the braking characteristics of all braking system is synthesized,the relevant factors of integrated braking system output braking torque is gained.(2)Based on different initial braking condition,combined on the characteristics of braking system,the supplied braking ability of all braking subsystem is analyzed;Based on decision tree algorithm,the nodes of model design is determined,integrated braking mode is designed;Based on ideal moment distribution curve,ensure the principle of braking stability and energy regeneration,the braking torque distribution ways of different braking modes are proposed.(3)Based on the communication platform of in-vehicle network CAN bus,based on mode exchange platform of MATLAB,integrated braking controlling structure is designed;based on hierarchical control strategy,integrated braking system joint simulation platform based on AMESim-MATLAB is built,aimed at different initial braking condition,emulation proof the validity braking mode designing and braking torque distribution.The thesis research work propose the theory support of mode designing and braking torque distribution on large hybrid bus mechanical-electric-magnetic integrated braking system,give the basis on the research of mechanical electric magnetic integrated braking controlling strategy.