What is meant by PID control Give an example of an industr

·        What is meant by PID control?

·        Give an example of an industrial PID control system.

·        Briefly explain why a PID control system, as opposed to other types of process control systems, is appropriate for this industrial application.

Solution

PID Control System:

PID controller is called a proportional–integral–derivative controller. This is commonly used in industrial control systems as a control loop feedback mechanism.

Example:

PID controller is used in Furnace Temperature Control. Furnaces involve heating and holding large amounts of raw material at very high temperature for a long time. It also contains materials that are of large mass. As a result it possesses a high degree of inertia – the material’s temperature doesn’t change quickly even when high heat is applied. This characteristic results in a relatively steady PV signal, and it allows the Derivative term to effectively correct for Error without excessive changes to either the CO or the FCE.

Why PID Controllers?

PID algorithm consists of three basic coefficients; proportional, integral and derivative which are varied to get optimal response. The basic idea behind a PID controller is to read a sensor, then compute the desired actuator output by calculating proportional, integral, and derivative responses and summing those three components to compute the output. The algorithm has sufficient flexibility to yield excellent results in a wide variety of applications and has been one of the main reasons for the continued use over the years.