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)


Open Loop and Closed Loop Control System
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.

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. 

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.

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

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

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.

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

OLCS is generally stable but Cannot is stabilized if it become Unstable.

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.

OLCS are more effected due to external disturbance and internal parameter variation. i.e. OLCS are more sensitive. 

CLCS with -ve feedback are less affected due to external disturbance and internal parameter variation i.e. CLCS with -ve feedback are less sensitive.

OLCS are simple and Economical.

CLCS is complex and expensive.

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

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.

                        About- What is the difference between open-loop and closed-loop control System. and 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.

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