17 March 2023

Difference between open loop and closed loop control system

The main difference between an open-loop system and a closed-loop system is that the closed-loop system can self-correct, whereas the open-loop system cannot. As a result, closed-loop systems are often referred to as feedback control systems, whereas open-loop systems are referred to as non-feedback controls. Let us check the difference between open-loop and closed-loop control system in this article. 

Open loop control system Vs Closed loop control system


Open Loop Control System: There is no feedback path is provided. 
Closed Loop Control System: There is a feedback path present. 

Also Called as

Open Loop Control System: Non-feedback control system
Closed Loop Control System: Feedback control system

Control Action

Open Loop Control System: The control action is independent of the overall system output. 
Closed Loop Control System: The control action is dependent on the system output.

Design Complexity

Open Loop Control System: The design and construction are quite simple. 
Closed Loop Control System: The design and construction are comparatively complex. 

Main Components

Open Loop Control System: Controller and plant.
Closed Loop Control System: Controller, plant or process, feedback element and error detector. 


Open Loop Control System: It has a fast response because there is no measurement and feedback of output. 
Closed Loop Control System: It has a slow response due to the presence of feedback. 


Open Loop Control System: Less reliable.
Closed Loop Control System: More reliable.


Open Loop Control System: The accuracy depends on the system calibration. Thus, accuracy may be less. 
Closed Loop Control System: This system is accurate because feedback maintains its accuracy. 


Open Loop Control System: More stable.
Closed Loop Control System: Less stable.


Open Loop Control System: Not optimized.
Closed Loop Control System: Optimized to produce a desired output.


Open Loop Control System: Less maintenance.
Closed Loop Control System: More maintenance.


Open Loop Control System: Easy to implement.
Closed Loop Control System: Relatively difficult to implement.


Open Loop Control System: Cost is low.
Closed Loop Control System: Cost is relatively high.

Internal noise

Open Loop Control System: More internal noise. 
Closed Loop Control System: Less internal noise. 

Examples of open loop control systems: Automatic traffic light systems, Immersion heaters, Automatic washing machine

Examples of closed-loop control systems: ACs, Fridge, Toaster, Radar tracking system

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