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What is the name of the control mechanism in which output has no influence on input?

What is the name of the control mechanism in which output has no influence on input? Correct Answer Open loop control system

Open-loop control system:

The open-loop control system can be described by a block diagram as shown in the figure below.

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These are the systems in which the control action is independent of output or output has no influence on input.

Ex: Traffic signals, washing machine and bread toaster, systems having no sensor, etc.

Advantages:

  • Simple construction and design
  • Cost is less
  • Maintenance is easy
  • No problem of instability
  • Convenient to measure when the output is difficult to measure

Disadvantages:

  • These are less accurate, and their accuracy depends on the calibration.
  • Inaccurate results are obtained with parameter variations within the system.
  • Recalibration of the controller is required time to time to maintain accuracy.


Closed-loop control system:

The open-loop control system can be described by a block diagram as shown in the figure below.

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These are the systems in which the control action depends on the output. These systems have a tendency to oscillate.

Ex: Temperature controllers, speed control of the motor, systems having sensors, etc.

Advantages:

  • More accurate
  • Non-linear distortions are less
  • Output is less sensitive to parameter changes within the system
  • Bandwidth increases


Disadvantages:

  • Design is complicated
  • More expensive
  • May become unstable, if there are malfunctions in the feedback.

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