Research Of The Stability Of Electric Vehicle Based On The Intelligence Control

Electrical Vehicle (EV) is kind of clean transportation. With the environmental problem and energy problem receiving more and more attention, the development of EV speeds up. Because of the EV based on the in-wheel motor greatly reduce the Mechanical components of vehicle, the structure of the vehicle is simple, and easily be controlled by intelligent method. Operational stability is one of the most important capability of the vehicle. The electric of the vehicle generate new problem of the operational stability and support the new ways to improve the operational stability. In this essay, the EV drived by double back in-wheel motor is the aim of research. Some research work would be done for improving the operational stability of EV.At first the basic conception and definition of operational stability of vehicle is showed in the paper. For improving the stability of the EV a method based on both the optimal slip rated control and fuzzy control had been proposed in the paper. Firstly, the condition of the road and the acceleration of the EV would be worked as the fuzzy input, after fuzzy calculation, the desired torque could be obtained. Secondly, both the desired torque and the inner parameters of the motor would be considered as the fuzzy input, and a algorithm had be designed in this paper, which could effectively improve the accuracy and reduce the torque pulse. And the motor was based on the direct torque control methods which could increase the response of the torque. When a car is turning a corner, the performance of the differential of vehicle is one of the important part of the operational stability of vehicle. According to the differential problem of the in-wheel motor driving EV, self-control electric differential method was proposed in this essay. Firstly, the basic steering dynamics model under the static condition was analysis. And considering many actual factors which would impact the differential, a method which synthesize the outside Influencing factors and the inside parameterAt last, the simulation model was built by MATLAB/Simulink, and the result of simulation proved two points. When vehicle running straightly with high speed, with the fuzzy control, the Yaw angle of vehicle can greatly reduced, and when the vehicle meet the complex road condition, it could restore straight running as soon as possible.At the same time, the fuzzy control can improve the acceleration performance of EV. The second point is that with the self-control strategy, under the different kinds of the road condition, the EV had good performance of differential.