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What is the major difference between open-loop control systems and closed-loop control systems?

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Question added by KANWALJEET singh
Date Posted: 2016/02/23
Abdul Hameed Khan
by Abdul Hameed Khan , Sr. Instrumentation and Control Project Engineeer , INDUSTRIAL INSTRUMENTATION and CONTROL SYSTEMS LTD.

An open-loop control system takes input under the consideration and doesn’t react on the feedback to obtain the output. This is why it is also called a non-feedback control system.

A closed loop system is also referred as a feedback control system. These systems record the output instead of input and modify it according to the need. It generates preferred condition of the output as compared to the original one. It doesn’t encounter any external or internal disturbances.

Mariam Hammad
by Mariam Hammad , trainee , Al-Wefaq Control Systems Company

Closed-loop control systems have feedback signal which compare with the input signal. In open-loop control systems there is no any feedback signal.

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