Difference Between Open-Loop and Closed-Loop Control Systems

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Difference Between Open-Loop and Closed-Loop Control Systems

BasisOpen-Loop Control SystemClosed-Loop Control System
DefinitionA control system in which the control action is independent of the output.A control system in which the control action depends on the output through feedback.

Feedback		No feedback is present.Feedback is present.
Control ActionDepends only on the input.Depends on both the input and the feedback signal.

AccuracyLower accuracy.Higher accuracy due to continuous correction.

Error DetectionCannot detect or correct errors automatically.

Detects and corrects errors automatically.

Disturbance HandlingCannot compensate for external disturbances.

Compensates for disturbances using feedback.
StabilityGenerally more stable because feedback is absent.

Can become unstable if not designed properly.
SensitivityMore sensitive to parameter changes and load variations.

Less sensitive to parameter changes because of feedback.
ReliabilityMore reliable due to fewer components.

Slightly less reliable because of sensors and feedback devices.
ComplexitySimple construction and operation.More complex due to feedback elements.
CostLow cost.

Higher cost.
MaintenanceEasy to maintain.

More difficult and expensive to maintain.
Power RequirementLower power consumption.


Higher power consumption due to additional components.
CalibrationUsually not required frequently.


May require periodic calibration of sensors and controllers.
Response SpeedUsually faster because there is no feedback processing.

Can be slightly slower because feedback takes time to process.
ExamplesElectric kettle, timer-based washing machine, toaster, traffic-light timer.

Air conditioner with thermostat, refrigerator, automatic voltage regulator, cruise control, autopilot system.

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