Research On The Electrical Differential Control Of Micro-electric Vehicle

The new energy electric vehicle has become the trend of the automotive industry inthe future, because it can reduces the energy consumption and environmental pollution.Most auto-builder and research institutes have invested a lot of manpower, material andfinancial to research and manufacture electric vehicles. Recently, the electric vehicleswhich droved by wheel motor has become the focus to research, because it has a simplemechanical structure, higher drive efficiency, lower cost and many other advantages. Butthe electric vehicles which droved by wheel motor can not use the mechanical differential,when turning. So the electronic differential is needed to solve this problem.The article analyses the structure and mechanics principle of mechanical differential,also used of the principle of differential under the same force of mechanical differential,put forward a control strategy of electronic differential. The design used a front-wheel-drive by brushless DC hub motor, and analyses the motor’s struck and working principle.Through building the mathematical model of brushless DC hub motor, analyses therelation of various parameters, and combined with the speed control system of brushlessDC hub motor, designed the speed control program of electronic differential. In order toestablish a more specific electronic differential control model, the article designed thehardware circuit, software and CAN communication protocol. Last the electronicdifferential control system was simulated by matlab/simulink. The results of thesimulation showed that the design of electronic differential control system wasreasonable and electronic differential had good effect on differential.The electronic differential controller solved the problem of the brushless DC hubmotor drive can not use the traditional mechanical differential and it also avoided themechanical differential transmission structure, greatly simplified the electric vehiclechassis space. Compared to other electronic differential, this design do not consider theproblem of the road surface and the steering angle, has a easier control calculationmethod, improves the stability of the control system, makes the vehicle has a bettercornering performance and control response.