Difference between Open Loop and Closed Loop Control System

In this article, we will study the what is difference between open-loop and closed-loop control systems.

Let’s compare both systems with multiple specifications.

Difference between Open Loop and Closed Loop Control Systems.

#	Content	Open-Loop Control System	Closed-Loop Control System
01	Defination What is open loop and closed loop control system?	The control system in which input or controlling action does not depend on the output is called an Open-loop control system.	The control system in which input or controlling action depends on the output is called an Closed-loop control system.
02	Called	Sometimes, an Open-loop control system is called a Non-feedback system.	A closed-loop control system is called as Feedback system.
03	Construction	The construction of an open-loop control system is very simple.	The construction of an open-loop control system is very complex.
04	Inbuilt Components	Mainly, two components (like controller and the controlled process) are included in an open-loop control system.	More componenets (like controller, feedback, comparator,etc) are included in closed-loop control system.
05	Required Additional System	This system does not consist of a feedback loop.	This system consists of a feedback loop to control the state or previous output of the dynamic system.
06	Stability of Open-loop & Closed loop systems.	This system occurs stable in nature.	This system occurs less stable or unstable in nature under certain conditions.
07	Output Function	The output does not change the action of the control system.	The output changes the action of the control system.
08	Performance of Operation	Open-loop control system gives the fast response in less time.	A closed-loop control system gives a slow response in more time.
09	Reliability	The reliability of this control system is less.	The reliability of this control system is more.
10	Effect on both control systems	Find more internal noise and the effect of parameter variation.	Find less internal noise and the effect of parameter variation.
11	Cost	The cost of this system is low.	The cost of this system is high.
12	Accuracy	The open-loop system performs accurately when calibration is good.	The closed-loop system performs accurately due to the feedback system.
13	Maintanance	Less maintenance is required in open-loop control system.	More maintenance is required in closed-loop control system.
14	Optimization	Optimization is not possible in this system.	Optimization is possible in this system.

15. Block Diagram of Open-Loop & Closed-Loop Control System

• Open-Loop Control System

• Closed-Loop Control System

16. What is the example of an open-loop & closed-loop control system?

Open-loop control system examples:

• Field control DC motor
• Television (TV) remote
• Automatic washing machine
• Automatic traffic light control
• Immersion rod

Closed-loop control system examples:

• Human respiratory system
• Air conditioner (AC)
• DC motor speed control
• Missile launching system
• Radar tracking system

These are all the basic specifications of open-loop vs closed-loop systems with examples. Also, describe the advantages and disadvantages of open and closed-loop control systems.

If you have any queries, you can ask in the comment section.

Thanks for Reading!