Research of dissolved oxygen concentration control strategy based on the fuzzy self-tuning PID parameter

As the result of the increasing speed of industrialization, a growing quantity of environmental pollution issues are coming up. Global people now attach greater importance to the sewage treatment process. The process of Dissolved Oxygen concentration control can be of randomly disturbance and time-varying, so it is unable to establish an accurate mathematical model. The traditional PID control couldn't tune its own parameters online, and however, through the fuzzy inference, the unconventional one self-tunes the parameters of PID controller online in accordance to the deviation of dissolved oxygen concentration and its rate. So it can help accurately control the concentration of dissolved oxygen during the waste water treatment procedure. Simulation experiments have shown that, in many aspects such as quality control and anti-interference, the control policy that self-tune PID parameter is superior to the traditional PID one.