This paper describes the realization of the fuzzy logic controller for liquid level control system, which is used in many process control applications. System realization uses the virtual instrument as a developing method, LabVIEW as the developing environment and fuzzy controller for control action of system have been used in the present work. The simulated result in LabVIEW shows that system response using fuzzy logic controller is better. This work also deals with formulation of system model, designing steps of fuzzy logic controller and software design of liquid level control system. In this paper, response of conventional controller (PID) is also compared with fuzzy logic controller output and it has been finally shown that the response of fuzzy logic controller is better as compare to PID controller.

Liquid level control system, PID controller, Fuzzy controller, LabVIEW.