Research And Development Of Intelligent Vehicle Drive System

The intelligent vehicle (IV) which will be the leading role in the future transportation system has a good prospect in the future. The pure electric intelligent vehicle (EIV) uses the electric energy as the power and has the advantage of no emission. It is easy to implement the intelligent control algorithm in the electric intelligent vehicle, because of the precise and stability control characteristics of the motor drive torque.The drive motor and its control-driving system are the core parts of the EIV. The characteristics of all the EV drive motor and the current and future development of the AC induction motor variable frequency speed regulation technology are analyzed according to the composition and performance requirement of the IV. At last, the AC induction motor direct torque control system is chosen to achieve the EIV drive system development after analyses and comparetion. The theory of the AC induction motor is elucidated and the model of the AC induction motor control system is set up. The application of the direct torque control algorithm in the AC induction control system is studied. Then the reference adaptive speed identification model and new type of flux and torque obveser have been introduced to the AC induction control system to improve the motor control performance.A probability model of the IV power control system based on ANFIS(adaptive neural-fuzzy inference systems) was built after analyzing the characteristics of the IV powertrain structure. A new method of the vehicle power control system is posed by the probability model, which provided a reference for the IV further research and development. The IV power driving system model, braking system and brake energy recovery system model were built separately in this paper based on ANFIS. Simulation and test results show that the model provided implements the power requirement identification and the power system control best. The safety and stability of the vehicle are improved; the simple and convenient IV driving is realized by the developed control system based on ANFIS. At last, the dynamics simulation model is set up. The result of the MATLAB/Cruise co-simulation platform proved that the designed IV control system is effective and feasible, which can achieve the vehicle drive control by requirement.An AC induction motor control system is developed based on the TMS320F2812 DSP control chip according to the simulation model. Its software and hardware design is presented in detail. The instruction and expience in the vehicle-borne equipments design is introduced, too.The IV powetrain control platform is built up based on the RTOS according to the IV function characteristics. Then the hardware design based on ARM and integration-style system platform based onμC/OS-II as operation system have been finished. The tests and experiments results indicate the platform has the characteristics of reasonable design, stable performance and reliable operation.