Difference Between Open Loop and Closed Loop Control System

What is the Difference Between the performance of Open Loop and Closed Loop Control System

The element of the open-loop control system(OLCS) can usually be divided into two parts controller and controller processes.

A system with one or more feedback paths such that just described is called a closed-loop control system(CLCS)

Difference Between Open Loop and Closed Loop Control System

Feedback also has effects on such system performance characteristics as Stability, bandwidth, overall gain, impedance, and sensitivity.

Open Loop Control System (OLCS)

#01. In the open-loop control System(OLCS) the behavior of the system does not change if the control variables change from the setpoint due to any disturbances. Hence OLCS is not accurate. 

#02. In OLCS feedback signal is not employed by the sensor and controller.

#03. The time constant of the open-loop control system is largely due to which the transient state large time to die out. Hence OLCS is slower.

#04. OLCS is generally stable but Cannot is stabilized if it becomes Unstable.

#05. OLCS are more affected due to external disturbance and internal parameter variation. i.e. OLCS are more sensitive. 

#06. OLCS are simple and Economical.

#07. OLCS is also called a Non-feedback control system and the Man-Machine control system.

Closed-Loop Control System (CLCS)

#01. Closed-Loop Control System(CLCS) the behavior of System changes if the control variable changes from the set of a point due to any disturbance. Hence CLCS is accurate.

#02. In the CLCS feedback signal is always employed either positively and negatively, Either manually and automatically between sensor and controller.

#03. The time constant of CLCS with negative feedback is smaller due to which the transient stateless time to die out hence CLCS with Negative feedback is faster.

#04. In spite of having negative feedback, CLCS can still become unstable due to [high open-loop gain, high type number, huge Transportation delay or phase lag, high sensitivity] but can be stabilized.

#05. CLCS with Negative feedback (-Ve) are less affected due to external disturbance and internal parameter variation i.e. CLCS with Negative feedback are less sensitive.

#06. CLCS is complex and expensive.

#07. CLCS is also called a feedback control system and Automatic control system.

NOTE- Negative Feedback doesn't grantee stability but it granted more stable than positive feedback.

Conclusion of Open Loop and Closed Loop System-  What is the difference between open-loop and closed-loop control systems. and the difference between open-loop and closed-loop congestion control and why we use a negative feedback system, why we prefer a negative feedback system over a positive feedback control system.

Also, read -  What is Control System

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