Development of Microcontroller Based Control System for Real-Time Liquid Level Process

摘要

Liquid level is one of the important process parameters monitored and controlled in process industries. It is often required to control the liquid height in a container to meet the required product specifications. Especially, liquid level in a tank is a nonlinear process, as the output flow is the function of liquid height. The conventional control strategies, such as PI and PID, fail to control the liquid level precisely when load is applied abruptly. The modern, advanced and expert control strategies are used widely in industrial control today. Also, the advent of advanced single-chip microcontrollers has attracted many instrumentation designers/engineers to use them as a platform to implement these control strategies. Though, there are many advantages associated with the microcontroller, its use in real-time liquid level control is hardly found in the literature. Hence, this work aims to describe ARM7 microcontroller based fuzzy logic control (FLC) system for real-time liquid level control under load disturbances.