Abstract: To improve the performance of control system,a new method for tuning PID parameters was proposed by using modified chaotic particle swarm optimization algorithm(CPSO).The chaotic search is applied to the initialization of position and velocity of initial swarm,the optimization of inertia weight,the generation of random constant and the generation of the local optimum neighborhood point,so that the algorithm has the ability of global optimization and continuous and precise local search.The experimental results of 3 typical control systems show that the proposed method for tuning PID parameters is effective,and the performance is obviously superior to the conventional methods.

Key words: PID control,Parameters tuning,Chaotic optimization,Particle swarm optimization algorithm