Design And Control Strategy Of Power Coupling System For Electric Vehicles

With the almost depletion of oil, natural gas and other non-renewable nature resources close to depletion, and worsening of human survival environment, the development of clean energy to drive the automobile has become the consensus of all countries. At present, the automobile industry is in great change from the traditional energy driven to electric energy driven, and pure electric vehicles with zero emissions and zero pollution is the main development direction of new energy cars of the future. The bottleneck of the development of pure electric vehicles is mile age, and currently the premise of the energy density of the battery is not yet implemented the creative breakthrough, so the feasible solution that the motive forces of the development of efficient assembly technology and energy management technology is the development of pure electric vehicle industry.Based on structure analysis and dynamic analysis of the multi-source torque coupling, speed coupling and planetary coupling, planetary coupling device was optimized and redesigned in the paper. A new dual motor coupling driving device was present for pure electric vehicles. The second motor was in coaxial arrangement with the synchronizer, and the first motor output shaft is connected with the sun gear in the driving device. Dynamic mechanical coupling device realizes the multiple working modes of the auto single motor drive, double motor driving speed coupling drive by controlling the synchronizer and the lock state, and drives the car forward.The main goals of the establishment of the vehicle dynamic and economic performance index and the design of double motor driving system of planet coupling were set. According to the requirement, the main parts, motor, battery planetary gear selection and parameter matching design were completed. Then based on the analysis of motor torque control? the strategy of motor drive of drive system was designed, and according to the characteristics of power coupling device of job design and actual operation the control strategy of automobile was designed. On the basis of the former work, mode switch control strategy was designed,and Determined speed as the control parameters for mode switching law finally. By reducing the power of the motor I in the mode switching process, reduced motor II torque output requirements, to reduce the impact of mode switching system.According to the space structure layout of dynamic system, the vehicle model in AVL Cruise software platform was built, and matched the design plan according to the above parameters of each component, and perfected sub-model information; the control strategy of the vehicle model in the Matlab/Simulink software platform was built. Provided by Cruise software interfaces, the combination of simulation between two platforms was realized to obtain the acceleration performance, climbing performance and NEDC simulation results and analyzed the simulation result.Finally, The bench test platform of the dual-motor drive system coupled by planetary gear was built. Because bench in the early stages of construction, so the paper only described the structure and contents of the tests bench, unable to get the final results.