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
Definition
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.
Response
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.
Reliability
Open Loop Control System: Less reliable.
Closed Loop Control System: More reliable.
Accuracy
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.
Stability
Open Loop Control System: More stable.
Closed Loop Control System: Less stable.
Optimization
Open Loop Control System: Not optimized.
Closed Loop Control System: Optimized to produce a desired output.
Maintenance
Open Loop Control System: Less maintenance.
Closed Loop Control System: More maintenance.
Implementation
Open Loop Control System: Easy to implement.
Closed Loop Control System: Relatively difficult to implement.
Cost
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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