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Overview

closed-loop control

In cybernetics, a control process in which a system's output is returned to its input as feedback, this being characteristic of controlled processing and all homeostatic processes. Compare ...

closed-loop control

closed-loop control n.   Quick reference

A Dictionary of Psychology (4 ed.)

Reference type:
Subject Reference
Current Version:
2015

...-loop control n. In cybernetics , a control process in which a system’s output is returned to its input as feedback , this being characteristic of controlled processing and all homeostatic processes. Compare open-loop control...

closed loop control

closed loop control   Quick reference

A Dictionary of Chemical Engineering

Reference type:
Subject Reference
Current Version:
2014

...closed loop control A system or process being controlled in which the controlled variable is measured and the result of this measurement is used to manipulate one of the process variables, such as steam flow to a heat exchanger, for example. ...

closed-loop control system

closed-loop control system   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018
Subject:
Science and technology, Engineering and Technology
Length:
92 words
Illustration(s):
1

...-loop control system Any control system in which the output has an effect upon the input quantity. To improve the performance of a system with respect to maintaining the output quantity as close to the desired quantity as possible, a person is replaced by a mechanical, electrical, or other form of comparison unit. The comparison between the reference input and the feedback signals results in an actuating signal that is the difference between these two quantities (see diagram). The actuating signal maintains the output at the desired value. Closed-loop...

closed-loop control

closed-loop control  

In cybernetics, a control process in which a system's output is returned to its input as feedback, this being characteristic of controlled processing and all homeostatic processes. Compare open-loop ...
Landscape History: The Countryside

Landscape History: The Countryside   Quick reference

H. S. A. Fox

The Oxford Companion to Local and Family History (2 ed.)

Reference type:
Subject Reference
Current Version:
2009
Subject:
History, Local and Family History
Length:
6,175 words
Publisher:
Oxford University Press

...were earlier antecedents): this was the deliberate creation of ‘closed’ villages and the related spontaneous development of contrasted ‘open’ settlements. In closed villages landlords carefully controlled labour, destroyed surplus cottages, and renovated or reconstructed the building stock, as at Lockinge and Ardington, described in 1891 as a ‘delightful Berkshire colony’, though visibly steeped in deference and dependence. In open villages no landlord or group of farmers could control immigration or building standards. Such villages came to have the...

closed loop system

closed loop system  

A control system that appears to be self-regulating. Closed-loop systems employ feedback and a reference of correctness (norm or set point). Deviations from the norm are detected and corrections made ...
open-loop control

open-loop control  

In cybernetics, a control process in which there is no feedback of the system's output to its input, such control being characteristic of ballistic movements, action slips, and some forms of ...
open-loop system

open-loop system  

A type of system, e.g. a metabolic pathway or an electrical circuit, in which control is not exerted by feedback, each operation or activity being affected only by those earlier in the sequence. ...
action slip

action slip  

An unintended action or behavioural sequence, often resulting from failure of attention in absent-mindedness, and generally involving open-loop control of an action that requires closed-loop control ...
absent-mindedness

absent-mindedness  

Preoccupation to the point of being inattentive to one's own behaviour and surroundings, often characterized by action slips arising from open-loop control of actions that demand closed-loop control ...
continuous servo

continuous servo  

A control mechanism, either behavioural or physiological, consisting of a closed-loop system in which there is a one-to-one relationship between the instruction from the executive level and the state ...
control

control  

The ability to determine the value of dependent variables. Complete controllability means that it is possible to move any state (of a system) to any other state during any finite interval of time by ...
discontinuous servo

discontinuous servo  

A closed-loop control system in which the control actions of the effector are not continuously related to the state of the system being controlled. A simple home thermostat controlling room ...
optoelectronics

optoelectronics  

An increasingly important technology concerned with the generation, processing, and detection of optical signals that represent electric quantities. Major areas for application of this technology ...
linear feedback control

linear feedback control   Quick reference

A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019

...linear feedback control A linear control system employing closed-loop control...

positional servomechanism

positional servomechanism   Quick reference

A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019

...positional servomechanism A closed-loop control system designed to control the position of a mechanical...

closed-loop frequency response

closed-loop frequency response   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018

...-loop frequency response A plot of the frequency response of a control system that has a closed-loop configuration. ...

open-loop control system

open-loop control system   Quick reference

A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019

...open-loop control system ( open-loop system ) A control system where the input applied to the plant is independent of the plant output, i.e. the opposite of closed-loop control...

closed loop

closed loop   Quick reference

A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019

...closed loop A closed loop uses a signal from the output of a controlled plant to modify the input so as to attempt to make the output match a specified set point irrespective of disturbances. A closed-loop control system is one using one or more closed loops...

control loop

control loop   Quick reference

A Dictionary of Chemical Engineering

Reference type:
Subject Reference
Current Version:
2014

...control loop A part of a process control system. Open loop control involves human operator intervention, whereas closed loop control is an automated system in which the output signal to the process is compared to a defined set point . ...

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