Fuzzy self-tuning immune feedback controller for tissue hyperthermia

A new universal controller structure suitable for various low or high order plants is presented. The controller includes a basic fuzzy self-tuning P-type immune controller inspired from the immune feedback mechanism of biological immune systems and an incremental block with the purpose to treat with the order of the plants. The P-type immune feedback law is automatically tuned by a fuzzy logic controller. The effectiveness of this control approach is examined by designing a fuzzy self-tuning PID-type immune controller to control tissue temperature during hyperthermia. Computer simulation results demonstrate that the control performance of the immune controller is superior to that of the corresponding linear controller.