Design On The Vehicle Control Unit For Electric Light Bus

Central control unit based on pure electric vehicles —— vehicle controller(Vehicle Control Unit, VCU) carried out research and development work. Main tasks include:(1) For pure electric vehicle control system study on the basic structure and working principle, determining the general structure of the electric light. High torque of permanent magnet synchronous motor, lithium iron phosphate battery and BMS energy management system, forms of communication based on CAN bus vehicle electric drive system, realized the electric direct drive electric light bus technology. According to the design of vehicle performance indicators, EHPS is chosen as the steering system device so as to enhance vehicle steering performance.(2) The study of principle and main function of the VCU, the vehicle electrical architecture is built, VCU hardware design framework programs. Follows the principle of universality and low cost the VCU hardware was designed, including the selection of the main control chip, micro controller system, input signal conditioning modules, intelligent power module, CAN bus communication module, has taken a series of anti-interference measures for improving the VCU hardware of anti-interference ability, and reliability of the PCB Board design and analysis.(3) Established a VCU software structure, developed a VCU software features based on module design of vehicle software framework, VCU software integration and development processes are briefly introduced. To study the driving control strategy,according to State different Power Assembly and vehicle operating conditions, vehicle status can be divided into self-test, standing, driving, 7 modes and mode if certain conditions are met and developed a drive based on torque control strategy, will be assigned to motor torque is more reasonable. Braking energy recovery strategy was established to meet vehicle safety, performance and comfort of the premise, increase the mileage of electric light. Classify the common faults of the system, and develop troubleshooting strategies. Build strategies based on MATLAB/Simulink models, c code is generated based on control strategy model, and provides a RTW(Real Time Workshop, real-time workshop)automatic debugging of your code.(4) The reference to the relevant standards, vehicle road test, tested the electricparameters such as light passenger power, the maximum operating speed; vehicle control strategy to verify the reliability and validity, the vehicle torque control, test and analysis of the braking energy recovery strategy to improve the driving comfort. Set up remote data monitoring platform based on Labview, representative sections of the vehicle during the running speed, mileage, power, fault and other information of a statistical analysis. Test results show that the vehicles accelerate smooth, control mode switch riding comfort,energy saving 16.7%~28.3%, fails policy processing is timely and accurate, can effectively protect the safety of vehicles and personnel.