Open-loop controller: Difference between revisions

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In an '''open-loop controller''', also called a '''non-feedback controller''', the control action from the controller is independent of the "process output", which is the process variable that is being controlled.<ref>"Feedback and control systems" - JJ Di Steffano, AR Stubberud, IJ Williams. Schaums outline series, McGraw-Hill 1967</ref>

[[File:Remote manipulators 003.jpg|thumb|upright|[[Remote manipulator]] arms for working with radioactive materials – an open-loop mechanism, controlled by hand controls]]

A characteristic of the open-loop controller is that itIt does not use [[feedback]] to determine if its output has achieved the desired goal of the input. Thisor meansprocess that the system does not observe the output of the processes that it is"set controllingpoint". Consequently, a trueAn open-loop system can notcannot engage in [[machine learning]] and also cannot correct any errors that it could make. It alsowill maynot not compensate for disturbances in the systemprocess being controlled.

An '''open-loop controller''', also called a '''non-feedback controller''', is a type of [[Controller (control theory)|controller]] that computes its input into a system using only the current [[state (controls)|state]] and its [[mathematical model|model]] of the system.

A characteristic of the open-loop controller is that it does not use [[feedback]] to determine if its output has achieved the desired goal of the input. This means that the system does not observe the output of the processes that it is controlling. Consequently, a true open-loop system can not engage in [[machine learning]] and also cannot correct any errors that it could make. It also may not compensate for disturbances in the system.

==Open-loop and closed-loop (feedback) control==

[[File:Remote manipulators 003.jpg|thumb|upright|[[Remote manipulator]] arms for working with radioactive materials – an open-loop mechanism, controlled by hand controls.]]

Fundamentally, there are two types of control loop; open loop control, and closed loop (feedback) control.