Type of Control System

There are three basic types control system that are:

Feed Forward Control System

Feed forward is a type of system which counters the changes in its surroundings.
It is used to maintain the wanted status of the system.
The biggest advantage of this system is that it does not permit the huge disturbance in the output.
The objective of feed forward control, also known as predictive control, is tom measure or predict and potential open-loop disturbances and compensate for them manually before the controlled variable devices too for from the original set point.

Open Loop Control System

A control system in which the control action is totally independent of output of the system then it is called open loop control system.
A manual control system is also known as open-loop control system.
An open loop control system is also referred as non-feedback control system.
Some other examples of open loop control system are:
- Electric Hand Drier
- Automatic Tea/Coffee Maker
- Bread Toaster
- Traffic Light Control System
- Electric clothes dryer

Closed Loop or Feedback Control System

Closed loop control system is a control system where its control action depends on both of its input signal and output response.
Closed loop control also known as feedback control system.
Open loop control system can be converted into closed loop control system by providing a feedback. This feedback automatically makes the suitable changes in the output due to external disturbance.
In this way closed control loop control system is called Automatic control system.
Some example of Closed control system are:
- Automatic Electric Iron, Water Level Controller
- An air Conditioner, Missile Launched and auto tracked by Radar.