Research On Information Processing And Control Network Of Mechanical-Electrical-Magnetic Integrated Braking For Large-Scale Parallel Hybrid Electric Bus

The large-scale parallel hybrid electric bus combines the advantages of internal combustion engine bus and pure electric bus,it can help to solve the energy crisis and air pollution problems.But it has characteristics such as heavy weight,big size and big number of passengers,so we have to improve its security and stability.Braking torque of the large-scale parallel hybrid electric bus braking system can be provided from three parts: pneumatic mechanical braking torque provided by pneumatic circuit,regenerative braking torque provided by permanent magnet synchronous motor,electromagnetic braking torque provided by eddy current retarder.The braking system which can provide three kinds of braking torque is called as: Mechanical-Electrical-Magnetic integrated braking system.The Mechanical-Electrical-Magnetic integrated braking system for large-scale parallel hybrid electric bus can according to different braking condition using different braking mode.Coordinating use three kinds of braking torque can improve the safety,stability,and energy recovery efficiency.But because of the complexity of Mechanical-Electrical-Magnetic integrated braking system,in order to formulate the braking torque control strategy,the integrated brake associated information must to be accurately obtained.And in-vehicle network is used to share the associated information.The main research contents of this study are as follows:(1)The characteristic and braking associated information of pneumatic mechanical braking system,energy regenerative braking system and eddy current retarder braking system is analyzed.The characteristic of Mechanical-ElectricalMagnetic integrated braking for large-scale parallel hybrid electric bus is studied,the modules of Mechanical-Electrical-Magnetic integrated braking system are divided and the braking mode of Mechanical-Electrical-Magnetic integrated braking is analyzed.The braking associated information is divided into measurable information and unmeasurable information,and the relationship between them is analyzed.(2)Aiming at unmeasurable information of Mechanical-Electrical-Magnetic integrated braking for large-scale parallel hybrid electric bus,vehicle speed(including vehicle longitudinal speed and vehicle lateral speed)and SOC(State of Charge)is estimated by filter estimate method,which is based on mathematical model and Unscented Kalman Filter.Vehicle slip angle and electromagnetic braking torque is estimated by mathematical analysis method.Based on Simulink-TruckSim-AMEsim,the Co-Simulation platform is built and the validity of information process methods is verified.(3)Based on CAN(Controller Area Network)bus,the control network structure of Mechanical-Electrical-Magnetic integrated braking of large parallel hybrid electric bus is designed.Based on SAE(Society of Automotive Engineers)J1939 advanced communication protocol,the application layer protocol of integrated braking control network is established.Mathematical analysis and Hardware in Loop method is used to analysis the performance of control network of Mechanical-Electrical-Magnetic integrated braking.This study provide technical support for research on information process and control network of Mechanical-Electrical-Magnetic integrated braking for large-scale parallel hybrid electric bus,and lay the foundation for research on coordination control strategy of Mechanical-Electrical-Magnetic integrated braking.