Research Of Fuzzy And PID Dynamic Switching Control Algorithm

PID control algorithm has been widely used in the real control engineering for its advantages such as structure simplicity, stable, easy realization and mature in theory. It has the advantage to eliminate the error, but the characteristic, which the contradiction of rapidity and overshoot is hard to balance and poor adaptability of control object parameter variation, make the algorithm difficult to meet the high level requirement of control quality. Nevertheless, fuzzy control algorithm which has strong adaptability of control object parameter variation can ensure the fast response and less overshoot for the control system, but it has the disadvantage of static error remaining.A kind of fuzzy and PID switching algorithm which bases on switching control strategy has been proposed in this thesis by combining the advantages of fuzzy control and PID control algorithm according to the real control engineering application. The main work of this thesis includes:1. Theory and design methods of fuzzy control and PID control algorithm are analyzed and their advantages and disadvantages have been summarized. The importance of the new algorithm which fuses the advantages of fuzzy and PID control algorithm has been illustrated.2. To reduce the complexity of calculation and to make the algorithm easy to use in embedded system, a novel fuzzy and PID dynamic switching control algorithm is brought forward based on mature PID and fuzzy control algorithm to acquire the adaptability of control object parameter variation.3. Fuzzy and PID dynamic switching control algorithm is proposed and simulated by using Simulink. The simulation is based on a kind of air press following control application of train break test system. The simulation results are also analyzed and compared with PID control algorithm, fuzzy control algorithm and a kind of fuzzy adaptive control algorithm to verify the control quality and adapt ability of fuzzy and PID dynamic switching control algorithm.4. A kind of train brake test system based on fuzzy and PID dynamic switching control algorithm is designed and its principle, hardware and software systems design process have been elaborated.