Comparison of Open Loop and Closed Loop Control Systems

Feature	Open Loop Control System	Closed Loop Control System
Effect of Output on Input	No effect on input	The input signal affects the controller output into the system
Stability	Very Stable	The response changes as the input signal changes.
Response to external disturbances	No reaction to disturbances.  The Open Loop control works on fixed output	The output of the controller adjusts itself in response to the input signal
Ease of Construction	The controller is easy to construct	Controller is difficult to construct as it is complex
Cost	Cheap	Expensive
Bandwidth	Small Bandwidth	Large Bandwidth
Maintenance	Low Maintenance	More Maintenance is required.
Feedback	There is no Feedback	Feedback is always present.