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A control system in which the control action is somehow dependent on the output is known as -

A control system in which the control action is somehow dependent on the output is known as - Correct Answer Closed loop 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.

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

Advantages:

  • These systems are simple in construction and design.
  • These systems are economic
  • Maintenance is easy
  • Usually, open-loop systems are not much troubled with problems of instability.
  • Convenient to measure when the output is difficult to measure

Disadvantages:

  • These systems are not accurate and reliable because their accuracy is dependent on the accuracy calibration.
  • Inaccurate results are obtained with parameter variations within the system i.e., internal disturbances.
  • 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:

  • In these systems, accuracy is very high due to the correction of any arising error.
  • In these systems, the output is less sensitive.
  • Reduced effect of non-linearity in these systems.
  • Output is less sensitive to parameter changes within the system
  • These systems have high bandwidth i.e., high operating frequency zone than the open-loop system.
  • The transient response in the closed-loop system decays more quickly than in the open-loop system.

 

Disadvantages:

  • Design is complicated
  • More expensive
  • Tendency towards oscillations if feedback is not property utilised.

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