Fuzzy-PID Based Liquid Level Control for Coupled Tank (MIMO) Interacting System

Multiple input multiple output (MIMO) control system conflicts with single input single output (SISO) control system in many ways because of various parameters. Two tank coupled interacting is one such system which has two inputs and two outputs and the control strategy used for it is not like SISO. Electrical control of the system mainly deals with control of supply to the pump which is the actual source of water to both the tanks. PID controller is generally used for controlling the liquid level. Basic PID controller has some demerits related with overshoot in the response and steady state error. This responses experimented on actual hardware are shown. Intelligent controller like fuzzy logic controller (FLC) when combined with PID can give better responses. These responses are validated and shown in this paper which is formulated in the form of simulation.