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Feedback controller
A closed-loop controller or feedback controller is a control loop which incorporates feedback, in contrast to an open-loop controller or non-feedback controller
Closed-loop_controller
Topics referred to by the same term
Closed loop or closed-loop may refer to: Loop (topology), topological path whose initial point is equal to its terminal point Closed curve, the image of
Closed_loop
Closed-loop geothermal, a new type of geothermal energy system
Closed-loop geothermal systems (also known as “advanced geothermal systems” or “AGS”) are a type of engineered geothermal energy system containing subsurface
Closed-loop_geothermal
Branch of engineering and mathematics
there are two types of control loop: open-loop control (feedforward), and closed-loop control (feedback). In open-loop control, the control action from
Control_theory
Fundamental building block of control systems
there are two types of control loop: open-loop control (feedforward), and closed-loop control (feedback). In open-loop control, the control action from
Control_loop
Process where information about current status is used to influence future status
vertical axis gain. In amplifiers, the loop gain is the difference between the open-loop gain curve and the closed-loop gain curve (actually, the 1/B curve)
Feedback
Sustainable recycling process
Closed-loop recycling is the process by which a product or material can be used and then turned into a new product (or converted back to raw material)
Closed-loop_recycling
Communication technique in which every received message is confirmed by the sender
Closed-loop communication is a communication technique used to avoid misunderstandings. Under this technique, any sent message is repeated back to the
Closed-loop_communication
System that manages the behavior of other systems
there are two types of control loop: open-loop control (feedforward), and closed-loop control (feedback). In open-loop control, the control action from
Control_system
Positions of a closed-loop transfer function's poles in the s-plane
systems theory, closed-loop poles are the positions of the poles (or eigenvalues) of a closed-loop transfer function in the s-plane. The open-loop transfer function
Closed-loop_pole
Manufacturing quality standards
Current good manufacturing practices (cGMP) are those conforming to the guidelines recommended by relevant agencies. Those agencies control the authorization
Good_manufacturing_practice
High-gain voltage amplifier with a differential input
applying a portion of the output voltage to the inverting input. The closed-loop feedback greatly reduces the gain of the circuit. When negative feedback
Operational_amplifier
Function describing the effects of feedback on a control system
control theory, a closed-loop transfer function is a mathematical function describing the net result of the effects of a feedback control loop on the input
Closed-loop_transfer_function
Control system whose input is independent of output
disturbances unlike a closed-loop control system. Fundamentally, there are two types of control loop: open-loop control (feedforward), and closed-loop control (feedback)
Open-loop_controller
the future. The variants of the scalar control include open-loop control and closed-loop control. The most common approach makes the voltage V proportional
Scalar_control
Duration of processing of products
individual product (closing the information loop). This broader reach has resulted in the extension of PLM into closed-loop lifecycle management (CL2M). Documented
Product_lifecycle
Public transit smart card used in India
(DMRC) will introduce Open Loop National Common Mobility Cards (NCMC) in a phased manner which will replace the current Closed Loop Delhi Metro Smart Cards
National_Common_Mobility_Card
Interpretation of sensory information
with a circular closed-loop system than with a linear open-loop one. Closed-loop perception can explain many of the phenomena that open-loop perception struggles
Perception
Blood glucose monitoring device
a key element in the development of a "closed-loop" system for the treatment of type I diabetes. A closed-loop system monitors blood glucose by CGM and
Continuous_glucose_monitor
Neurosurgical treatment
motor symptoms between conventional deep brain stimulation (cDBS) and closed-loop adaptive deep brain stimulation (aDBS) in patients with Parkinson's disease
Deep_brain_stimulation
Portable apparatus to recycle breathing gas
principle as closed circuit and semi-closed circuit rebreathers. Closed circuit rebreather: A closed circuit rebreather adds oxygen to the loop gas to make
Rebreather
System for people with diabetes
boluses. Advanced hybrid closed loop systems have advanced algorithms.[citation needed] Fully Closed Loop (FCL) Fully or full closed loop (FCL) systems adjust
Automated insulin delivery system
Automated_insulin_delivery_system
Type of machine that uses liquid fluid power to perform work
This type of circuit can use inexpensive, constant displacement pumps. Closed-loop: Motor-return is connected directly to the pump-inlet. To keep up pressure
Hydraulic_machinery
Use of various control systems for operating equipment
way that the process stays at its set point despite disturbances. This closed-loop control is an application of negative feedback to a system. The mathematical
Automation
Measure of how a closed loop transfer function is affected by parameter changes
control system measures how variations in the plant parameters affect the closed-loop transfer function. Since the controller parameters are typically matched
Sensitivity_(control_systems)
Data transmission rate management
Closed-loop flow control is used by ABR (see traffic contract and congestion control). Transmit flow control described above is a form of closed-loop
Flow_control_(data)
Cooling system used in data centers
close-coupled solutions can be divided into two categories: open-loop and closed-loop. Open-loop configurations are not totally independent of the room in which
Close-coupled_cooling
Abstract representation of movement
account of movement control. In contrast to the open-loop response-chaining hypothesis, Adams' closed-loop theory suggested that processing of afferent information
Motor_program
Prepaid-stored-value money card
later transaction. A third form is the hybrid closed loop card whose issuer has bundled a number of closed loop cards; an example is free gift cards for a
Gift_card
Control loop feedback mechanism
(PID) controller, or three-term controller, is a feedback-based control loop mechanism commonly used to manage machines and processes that require continuous
PID_controller
Thermal energy generated and stored in the Earth
working fluid stays inside a closed loop of deeply buried pipes that conduct Earth's heat. The advantages of a deep, closed-loop geothermal circuit include:
Geothermal_energy
MIMO wireless transmission technique
limitations of the feedback channel. In a closed-loop MIMO system the input-output relationship with a closed-loop approach can be described as y = H W s
Spatial_multiplexing
Technique used in optical systems
"open loop".If the wavefront error is measured after it has been corrected by the wavefront corrector, then operation is said to be "closed loop". In the
Adaptive_optics
Type of knot
of the rope, in a closed loop or strap, or a combination of these two in which it is tied with the end and then formed into a loop by securing the free
Cow_hitch
World line of a particle in spacetime which returns to its starting point
time as seen externally. A closed timelike curve can be created if a series of such light cones are set up so as to loop back on themselves, so it would
Closed_timelike_curve
Concept in game theory
game theory, an open-loop model is the one where players cannot observe the play of their opponents, as opposed to a closed-loop model, where all past
Open-loop_model
International Space Station life-support system
repair kit, and the OGS was brought into full operation. The Advanced Closed Loop System (ACLS) is an ESA rack that converts carbon dioxide (CO2) and water
ISS_ECLSS
Line of continuous glucose monitors
"Hybrid Closed Loop systems, the Dexcom way | Dexcom Healthcare Professionals". uk.provider.dexcom.com. Retrieved 2025-04-09. "Hybrid Closed-Loop Insulin
Dexcom_CGM
Computer control of machine tools
open-loop or a closed-loop system. In an open-loop system, communication takes place in one direction only: from the controller to the motor. In a closed-loop
Computer_numerical_control
Graphical method of determining the stability of a dynamical system
plot of the open loop systems, it can be applied without explicitly computing the poles and zeros of either the closed-loop or open-loop system (although
Nyquist_stability_criterion
Cooling system that uses solar power
and shorten the life of the equipment. Another method is a closed loop system, in which a loop of tubing is run down a well or wells, or in trenches in
Solar_air_conditioning
Type of propeller design
is a type of propeller that is ring-shaped with each blade forming a closed loop. The propellers are significantly quieter at audible frequency ranges
Toroidal_propeller
Dutch scientist
"Harold" Krikke (born 1967) is a widely recognized scientist working in the closed loop supply chain field. Krikke studied Industrial Engineering and Management
Harold_Krikke
concept of cumulative quantities (CCQ) uses the feedback mechanism of a closed loop, which can be found in industrial, engineering and electronic systems
Cumulative quantities (logistics)
Cumulative_quantities_(logistics)
Topics referred to by the same term
changes All pages with titles beginning with Closed Close (disambiguation) Closed loop (disambiguation) Closing (disambiguation) Closure (disambiguation) Open
Closed
Control concept
approximate gain 1/β is independent of the open-loop gain A, the feedback is said to 'desensitize' the closed-loop gain to variations in A (for example, due
Negative_feedback
Loop that increases an initial effect
Mathematically, positive feedback is defined as a positive loop gain around a closed loop of cause and effect. That is, positive feedback is in phase
Positive_feedback
Using something again
"transport packaging" such as plastic crates or pallets. The benefits of closed-loop reuse are primarily due to low additional transport costs being involved
Reuse
Business practice
Closed-loop box reuse, is the process by which boxes or other containers are reused many times. It is a form of reusable packaging. This is sometimes
Closed-loop_box_reuse
Geothermal technology company
energy technology based on the closed loop principle. The Eavor-Lite Demonstration Project is a prototype closed-loop geothermal system located near Rocky
Eavor_Technologies
Category of medical devices that respond to signals in a patient's body to treat disease
; Priori, Alberto; Marceglia, Sara (2021-12-07). "A New Implantable Closed-Loop Clinical Neural Interface: First Application in Parkinson's Disease"
Responsive neurostimulation device
Responsive_neurostimulation_device
Stability criterion in control theory
determine stability of the system. The root locus plots the poles of the closed loop transfer function in the complex s-plane as a function of a gain parameter
Root_locus_analysis
Regulation of movement within organisms possessing a nervous system
grows, a relationship known as Hick's law. The classical definition of a closed loop system for human movement comes from Jack A. Adams (1971). A reference
Motor_control
Underwater diving using self contained breathing gas recycling apparatus
venting the loop. The loop has a pressure relief valve to prevent damage caused by over-pressure of the loop when the mouthpiece valve is closed. Electronically
Rebreather_diving
Method for proving control of a contact point (e.g., an email address)
Closed-loop authentication, as applied to computer network communication, refers to a mechanism whereby one party verifies the purported identity of another
Closed-loop_authentication
many practical open-loop and closed-loop control applications and is relevant to analyzing many fundamental steady-state closed-loop system properties such
Relative_gain_array
to 6 feet less than the total borehole length from the surface). See Closed-Loop Geothermal System entry. The surrounding air (usually outdoor air or
Glossary of geothermal heating and cooling
Glossary_of_geothermal_heating_and_cooling
Function of management which helps to check errors in order to take corrective actions
predetermined arrangements, it is a closed-loop system. A home thermostat is an example of a control device in a closed-loop system. When the room temperature
Control_(management)
Theorem used for studying closed-loop stability
S_{1}} and S 2 {\displaystyle S_{2}} are connected in a feedback loop, then the closed loop system is input-output stable if ‖ S 1 ‖ ⋅ ‖ S 2 ‖ < 1 {\displaystyle
Small-gain_theorem
Fuel injection technology for automotive petrol engines
Renault 30, and in the DMC DeLorean in 1981. A variant of K-Jetronic with closed-loop lambda control, also named Ku-Jetronic, the letter u denominating USA
Jetronic
In mathematics, especially abstract algebra, loop theory and quasigroup theory are active research areas with many open problems. As in other areas of
List of problems in loop theory and quasigroup theory
List_of_problems_in_loop_theory_and_quasigroup_theory
Type of motor
term servomotor is often used to describe a motor suitable for use in a closed-loop control system. Servomotors are used in robotics, CNC machinery, and
Servomotor
Control system for the motion of a mechanical system
includes a servomotor, and uses closed-loop control to reduce steady-state error and improve dynamic response. In closed-loop control, error-sensing negative
Servomechanism
Topics referred to by the same term
up loop in Wiktionary, the free dictionary. Loop or LOOP may refer to: Loop (mobile), a Bulgarian virtual network operator and co-founder of Loop Live
Loop
Closed loop path containing a magnetic flux
A magnetic circuit is made up of one or more closed loop paths containing a magnetic flux. The flux is usually generated by permanent magnets or electromagnets
Magnetic_circuit
Instrument to measure electric current
moving coil galvanometers; in addition, they are divided into closed-loop and open-loop - or resonant - types. Mirror galvanometer systems are used as
Galvanometer
Electronic flight control system
aileron, flaps and engine controls in different situations using a closed feedback loop. The pilot may not be fully aware of all the control outputs acting
Fly-by-wire
Greek skill toy
time or keep the hands busy. While komboloia have beads strung in a closed loop, the beads of the modern begleri are threaded on an open strand, usually
Begleri
Method in feedback control system theory
is a method employed in feedback control system theory to place the closed-loop poles of a plant in predetermined locations in the s-plane. Placing poles
Full_state_feedback
Two equalities that deal with the current and potential difference
law, or Kirchhoff's loop rule, states the following: The directed sum of the potential differences (voltages) around any closed loop is zero. Similarly
Kirchhoff's_circuit_laws
British media artist (born 1993)
14 January 2025. Jake Elwes. "Closed Loop". Jake Elwes Official Website. Retrieved 14 January 2025. ZKM. "Closed Loop". ZKM. Retrieved 14 January 2025
Jake_Elwes
Electrical configuration allowing electricity to cross between grounded devices
ground loop is caused by the interconnection of electrical devices that results in multiple paths to ground, thereby forming closed conductive loops through
Ground_loop_(electricity)
Assemblage of connected electrical elements
inductances, capacitances). An electrical circuit is a network consisting of a closed loop, giving a return path for the current. Thus all circuits are networks
Electrical_network
is one of the few construction materials for which closed loop recycling is possible. Closed loop recycling of gypsum products involves the collection
Gypsum_recycling
Exhaust emission control device
Therefore, engines fitted with regulated 3-way catalytic converters have a closed-loop feedback carburetor or fuel injection engine control system to manage
Catalytic_converter
Type of predictive controller
a delay) and design a controller C ( z ) {\displaystyle C(z)} with a closed-loop transfer function H ( z ) = C ( z ) G ( z ) 1 + C ( z ) G ( z ) {\displaystyle
Smith_predictor
Field of automation which studies how to precisely move parts of machines
more prime movers or actuators. Motion control may be open loop or closed loop. In open loop systems, the controller sends a command through the amplifier
Motion_control
Development approach in manufacturing industry
products in use (in case of continued development the actual product) Closed-loop systems driven product development aims at reducing test-and-repair.
Predictive engineering analytics
Predictive_engineering_analytics
Parameter of electronic amplifiers
at the frequency at which its open-loop voltage gain equals its closed-loop voltage gain, as long as the open-loop voltage gain is one or greater. The
Phase_margin
Aircraft wing configuration with a non-planar, continuous surface wing
For any lifting system (or portion of a lifting system) that forms a closed loop as viewed in the freestream flow direction, the optimum lift (or circulation)
Closed_wing
Approach to controller design that explicitly deals with uncertainty
the plant. A systematic methodology to shape the loop gain across frequencies, as well as the closed loop characteristics of a feedback interconnection of
Robust_control
Method of heat exchange in which convection drives pumpless circulation
even one mounted above the originating tank — or it can be a vertical closed-loop circuit with return to the original container. Its purpose is to simplify
Thermosiphon
Time behavior of a system controlled by Heaviside step functions
{\displaystyle A_{FB}={\frac {A_{OL}}{1+\beta A_{OL}}},} where AOL = open-loop gain, AFB = closed-loop gain (the gain with negative feedback present) and β = feedback
Step_response
Method to control electric motors
Inverters can be implemented as either open-loop sensorless or closed-loop FOC, the key limitation of open-loop operation being minimum speed possible at
Field-oriented_control
Processes which convert waste plastic into new items
build-up. In 2013 only 2% of plastic packaging was recycled in a closed loop. Although closed-loop recycling has been investigated for many polymers, to-date
Plastic_recycling
Family of control systems
off-line (see below). Since, on practical industrial applications, open-loop or closed-loop data are often available continuously, on-line data-driven techniques
Data-driven_control_system
Set of processes exchanging nutrients between parts of a system
recycling is impossible for technological waste. Ecosystems execute closed loop recycling where demand for the nutrients that adds to the growth of biomass
Nutrient_cycle
Visualization of variable interrelationships
loop diagrams are accompanied by a narrative which describes the causally closed situation the CLD describes. Closed loops, or causal feedback loops,
Causal_loop_diagram
Nerve sensors used in brain-computer interfaces
automated brain electrical stimulation (also known as contingent, or closed loop stimulation), which provides seizure-halting electrical stimulation based
Neural_dust
Set of waveguides including a closed loop
micro-ring resonator (MRR) is a set of waveguides in which at least one is a closed loop coupled to light input and output. The input and output can be, but are
Optical_ring_resonators
Class of chemical compounds
consists of four repeating units of silicon (Si) and oxygen (O) atoms in a closed loop giving it a circular structure. Each silicon atom has two methyl groups
Cyclosiloxane
Gauge field loop operator
field theory, Wilson loops are gauge invariant operators arising from the parallel transport of gauge variables around closed loops. They encode all gauge
Wilson_loop
System to transfer heat to/from the ground
technology has improved. Open loop systems dominated the market until the development of polybutylene pipe in 1979 made closed loop systems economically viable
Ground_source_heat_pump
Region of a messenger RNA
of translation is the interaction between 3′ UTR and the 5′ UTR. The closed-loop structure inhibits translation. This has been observed in Xenopus laevis
Five prime untranslated region
Five_prime_untranslated_region
Business development concept
resource efficiency measures, life-cycle thinking, and the development of closed-loop manufacturing systems. Resource Efficiency (Eco-efficiency, Cleaner Production):
Sustainable_innovation
Magnetic analogue of the electric dipole
magnet). The more correct description of a magnetic dipole is that of a closed loop of electric current that encloses a flat area a. The magnetic moment
Magnetic_dipole
Directed graph with no directed cycles
vertex to another, such that following those directions will never form a closed loop. A directed graph is a DAG if and only if it can be topologically ordered
Directed_acyclic_graph
Integrated sales and marketing
how well they are followed up. Smarketing works best when a firm does closed loop reporting by tracking its success with particular prospects from the
Smarketing
Nonlinear equation which arises on linear optimal control problems
system makes the closed loop system stable. For the CARE, the control is K = R − 1 B ⊤ P {\displaystyle K=R^{-1}B^{\top }P} and the closed loop state transfer
Algebraic_Riccati_equation
Self-contained propulsion system for boats
boosted low end torque (Honda's BLAST), 3-way cooling systems, and closed loop fuel injection. Mercury Verado four-strokes are unique in that they are
Outboard_motor
travel, tourism, insurance
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