The precise control of mobile robot is an important issue in robotics field. In this paper, the motion model of mobile robot is established by mechanism analysis. Then, a fuzzy PID controller is designed for trajectory tracking of mobile robot. The controller consists of a PID controller and a fuzzy inference unit with two inputs and three outputs to tune the parameters of PID controller according to the error and error rate. Finally, the model of a four-wheel mobile robot, fuzzy PID and traditional PID controller are all simulated in Simulink. Simulation experiments are reached in different conditions. The result shows that the mobile robot with the fuzzy PID controller can track the desired trail by about 3 seconds in advance and the overshoot of the system will decrease by 40 percent, comparing to the mobile robot with the traditional PID controller. The advantages of fuzzy PID controller for trajectory tracking control of mobile robot are major in its rapidity, stability, anti-interference and tracking precision.
In REF , the authors presented a fuzzy logic PID controller for trajectory tracking of a four WMR with its Simulink models, and the results of simulations using the fuzzy PID controller for tracking straight line and the circle path are compared with the results obtained using the standard PID controller.
Fuzzy PID Based Trajectory Tracking Control of Mobile Robot and its Simulation in Simulink
International Journal of Control and Automation
Engineering