18 September 2020

Difference Between Open Loop and Closed Loop System

One of the most significant differences in the open-loop and closed-loop control system is that in an open-loop system the desired output does not depend on the control action. Whereas in the closed-loop system the desired output depends on the control action of the system. So here this article gives the main key difference between the open-loop ad close loop system to better understand this topic.

Open-loop control system:

In an open-loop control system, the output does not affect the control action of the system. In other words, the system whose working depends on time is knowns as the open-loop system is free from the feedback. 

Closed-loop control system:

The closed-loop control systems mean the output of the system depends on their input. The system has one or more feedback loop between its output and input. While we are using the closed-loop system design in such a way that they automatically provide the desired output by comparing it with the actual input. The closed-loop system the error signal which is the difference between the input and output.

Difference between open and closed-loop system:

  • The open-loop system which means the output of the system is free from their input. while in the closed-loop system, the desired output depends on their input.
  • The accuracy of the open-loop system is less as compared to the closed-loop system.
  • The open-loop system is not optimized, The closed-loop system is optimized.
  • The open-loop system is called the non-feedback system whereas the closed-loop is the feedback system.
  • The open-loop system gives a fast response, whereas The closed-loop system gives a slow response.
  • The calibration of an open-loop system is difficult as compared to the closed-loop system.
  • The open-loop system the disturbance affected the output, whereas in a closed-loop system the output is not much affected by the disturbances.
  • The open-loop system is not reliable, the closed-loop system is reliable.
  • The open-loop system is stable as compared to closed-loop systems. Here the word stale means the output of the system remains constant even after the disturbances.
  • The construction of systems is easy because few elements are used in the system, The construction of the close loop system is quite difficult. 
  • The output control system has a non-linear response, whereas the input control system has a linear response.
  • The traffic light, automatic washing machine, etc are examples of the output system, whereas the temperature controller, toaster, etc are the example of the closed-loop systems.
  • The control and controlled process are other the two components of the open-loop system. The close loop requires some components like an amplifier, controller, controlled process, feedback system, etc.
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