Fuzzy immune PID control of pH value in chemical industry process

Nonlinear fuzzy immune PID can accommodate some nonlinear characteristics because it allows the parameters varying according to system states. Acid-base neutralization in chemical industry process has strong nonlinearity. A novel fuzzy immune PID control algorithm was proposed. One of the benefits of the suggested approach is that controller parameters can vary in large-scale. Basing on the model of acid-base neutralization, a simulation experiment was implemented to verify its control performance. The experiment results (Figure 3 and 4) show that fuzzy immune PID can achieve better control performance than auto-adaptive fuzzy PID and conventional PID.