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	Industry automatic control fundamentals .
		All automatic controllers use the same general responses, although the internal mechanisms and the definitions given for these responses may be slightly different from one manufacturer to another.
		The controller must be able to move the valve, the valve must be able to affect the measurement, and the measurement signal must be reported to the controller.
		One way to improve the response of control valves is to use a valve positioner, which acts as a feedback controller to position the valve at the exact position corresponding the controller output signal.
	www.sapiensman.com /automatic_control (1212 words)

	Automatic gain control - Wikipedia, the free encyclopedia
		Its purpose is to control the gain of a system in order to maintain some measure of performance over a changing range of real world conditions.
		The receiver's gain is automatically adjusted to maintain a constant level of overall visible clutter.
		Video copy control schemes such as Macrovision exploit this, inserting signal spikes which will be ignored by most televisions but cause the deck's AGC to overcorrect and corrupt the recording.
	en.wikipedia.org /wiki/Automatic_gain_control (445 words)

	Automatic control - Wikipedia, the free encyclopedia
		Automatic control is the research area and theoretical base for mechanization and automation, employing methods from mathematics and engineering.
		A central concept is that of the system which is to be controlled, such as a rudder, propeller or an entire ballistic missile.
		A regulator such as a thermostat is a typical example of a device studied in automatic control.
	en.wikipedia.org /wiki/Automatic_control (173 words)

	Automatic gain control -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-11-04)
		Automatic gain control (AGC) is an (additional info and facts about electronic) electronic (Instrumentality that combines interrelated interacting artifacts designed to work as a coherent entity) system found in many types of devices.
		Its purpose is to control the (The amount by which the revenue of a business exceeds its cost of operating) gain of a system in order to maintain some measure of performance over a changing range of real world conditions.
		Video copy control schemes such as (additional info and facts about Macrovision) Macrovision exploit this, inserting signal spikes which will be ignored by most (A telecommunication system that transmits images of objects (stationary or moving) between distant points) televisions but cause the deck's AGC to overcorrect and corrupt the recording.
	www.absoluteastronomy.com /encyclopedia/a/au/automatic_gain_control.htm (368 words)

	InsightCentral.net - Encyclopedia - Honda Insight Automatic Climate Control
		When the climate control system is set in full-auto mode, idle stop will not take place if the system wishes to run the air conditioning compressor.
		When the climate control system is set to "Econ" mode, the system will function normally, except that idle stop will still take place if the cabin temperature has stabilized at the set temperature, possibly meaning that the air conditioning compressor to stop running for the duration of auto idle stop mode.
		Automatic activation: If the outside temperature is below 0 C (32F), and the engine has not yet reached operating temperature, the heating grids will automatically activate.
	www.insightcentral.net /encyclopedia/enclimatecontrol.html (365 words)

	Automatic transmission - Wikicars
		An automatic transmission is an automobile gearbox that can change gear ratios automatically as the car or truck moves, thus freeing the driver from having to shift gears manually.
		The predominant form of automatic transmission is hydraulically operated, using a fluid coupling or torque converter and a set of planetary gearsets to provide a range of torque multiplication.
		The hydraulic pressure controlled by these valves drives the various clutch and brake band actuators, thereby controlling the operation of the planetary gearset to select the optimum gear ratio for the current operating conditions.
	wikicars.org /en/Automatic_transmission (1775 words)

	A brief history of feedback control - Chapter 1
		Feedback control may be defined as the use of difference signals, determined by comparing the actual values of system variables to their desired values, as a means of controlling a system.
		Around 1624 he developed an automatic temperature control system for a furnace, motivated by his belief that base metals could be turned to gold by holding them at a precise constant temperature for long periods of time.
		His device was a speed control system which turned the telescope automatically to compensate for the earth's rotation, affording the ability to study a given star for an extended time.
	www.theorem.net /theorem/lewis1.html (8851 words)

	AllRefer.com - automatic tuning control (Electrical Engineering) - Encyclopedia
		Assuming that the receiver is at least approximately tuned to the desired frequency, a circuit in the receiver develops an error voltage proportional to the degree to which the receiver is mistuned.
		In an FM receiver, automatic frequency control (AFC) may make it difficult to receive a weak signal located near in frequency to a strong one.
		In tuning circuits that use frequency synthesis, in which digital circuitry, in conjunction with a crystal oscillator, produces precise signals, automatic tuning control is not necessary.
	reference.allrefer.com /encyclopedia/A/autotun.html (274 words)

	Modern Mechanix » AUTOMATIC CONTROL
		We now possess at least a first approximation to an adequate theory of automatic control, and we are at a point of history when the practical application of that theory begins to be conspicuous and widely felt.
		The future of automatic control, and the significance for human weal or woe of its extension to fresh areas of modern life, are still obscure.
		There is a good empirical basis for the belief that automatic control, by increasing the material well-being of a greater fraction of mankind, will release fresh energies for the cultivation and flowering of human excellence.
	blog.modernmechanix.com /2006/03/30/automatic-control (1773 words)

	Automatic control theory
		Controllability is related to the possibility of forcing the system into a particular state by using an appropriate control signal.
		Optimal control is a particular control technique in which the control signal optimizes a certain "cost index": for example, in the case of a satellite, the jet thrusts needed to bring it to desired trajectory that consume the least amount of fuel.
		In control theory it is sometimes possible to linearize such classes of systems and apply linear techniques: but in many cases it can be necessary to devise from scratch theories permitting control of non-linear systems.
	www.webservicesfree.com /Articles/Automatic-control-Articles/Automatic-control-theory-introduction.htm (2326 words)

	Welcome to Asphalt Control Systems, Inc.
		The single control board’s visual display features help a qualified plant electrician determine if the system is operating satisfactorily and provides clues as to what other equipment may have caused plant malfunction.
		The single control board’s visual display features help a qualified plant electrician determine if the system is operating satisfactorily and provides and provides clues as to what other equipment may have caused plant malfunction.
		Control and monitoring of the data logging process is provided by the 16 character liquid crystal display and 24 key keyboard on the Data Logger’s front panel.
	www.asphaltcontrol.com /drumplantcontrols (1063 words)

	Automatic Exposure Control (AEC)
		Question 2: A facility’s x-ray unit has a single detector that may be moved to any of three positions along the chest wall to nipple midline of the breast.
		Since the area is automatically selected, the display of the size of the detector is not required.
		The unit is not required to meet the AEC performance specification outside the 2 to 6 cm range and the physicist is not required to test the AEC performance requirements for thicknesses outside this range during the annual survey.
	www.fda.gov /cdrh/mammography/robohelp/finalregsautomatic_exposure_control_aec.htm (1974 words)

	automatic frequency control on Encyclopedia.com (Site not responding. Last check: 2007-11-04)
		Monitoring and control of batch processes: multivariate statistical monitoring technologies can be applied to batch systems to help process operators and engineers identify abnormal operation and improve product...
		Automatic activation of Yellow Peril Asian American stereotypes: effects on social impression formation.
		Automatic feature selection for unsupervised clustering of cycle-based signals in manufacturing processes.
	www.encyclopedia.com /html/X/X-autofreq.asp (413 words)

	Automatic Control Group
		Control Engineering, the science of controlled systems, is one of the basic subjects within the engineering sciences.
		Control theory is the applied mathematics that gives the theoretical foundation for control engineering.
		Automatic control was established as an independent scientific discipline some 50 years ago.
	www.s2.chalmers.se /research/control (297 words)

	Institute of Automatic Control and Control Systems Technology — regpro
		The institute of automatic control and control systems technology, a division of the mechatronic group at the University of Linz, was set up in 1992 to facilitate the research and development of control systems.
		Automatic control covers principles and methods to analyze and design feedback systems.
		The institute aims to address the control demands of complex systems by developing new and innovative solutions that are relevant to industrial applications.
	regpro.mechatronik.uni-linz.ac.at (127 words)

	High-Speed Network Traffic Management: Automatic Control Approach
		From the automatic control point of view, there is a set of automatic control systems that have different control rates and respond to the input force changes in appropriate time intervals (short or long).
		The aims of the control are to maintain the number of cells in the VB queue at a desired setpoint and protect the buffer from overflow.
		The main steps of automatic control methodology include the hierarchical representation of management systems and the formal definitions of input variables, object and goal of control of each management level in terms of automatic control theory.
	www.chg.ru /inet97/F6/F6_2.HTM (2912 words)

	Industry automatic control fundamentals .Controller responses .
		For some controllers, proportional action is adjusted by such a "gain" adjustment, while for others a "proportional band" adjustment is used.
		This proportional band value, known as the ultimate proportional band, is a limit on the adjustment of the controller in that loop.
		One consequence of the application of proportional control to the basic control loop is offset.
	www.sapiensman.com /automatic_control/automatic_control2.htm (1336 words)

	UU/IT/research/syscon/automatic/modcont_waste
		Applied research in automatic control is one important tool in achieving an overall high plant performance.
		A key goal is to develop and evaluate control strategies which can be of practical use in improving the performance of the plants.
		Automatic Control of an Activated Sludge Process in a Wastewater Treatment Plant - a Benchmark Study, Anders Rehnström (2000).
	www.it.uu.se /research/syscon/automatic/modcont_waste (665 words)

	Refrigeration - Automatic Control patents
		Automatic Control patent applications listed are from June 2005 to current and include Date, Patent Application Number, Patent Title, Patent Abstract summary and are linked to the corresponding patent application page.
		A method and apparatus for controlling the temperature of an environmental chamber by controlling the flow of refrigerant, the number of compressors and fans as necessary to produce and preserve precise temperature conditions within the chamber which uses less energy than available systems.
		The method of evaluating the performance of a control system includes calculating a ratio of a first area associated with the signal and a second area associated with the signal.
	www.freshpatents.com /x1062132000psbc.php (797 words)

	Automatic Control Systems - Access Control Equipment and Perimeter Security Management
		Automatic Control Systems manufacture turnstiles, gates, revolving doors, road blockers, and other perimeter control devices for commercial and industrial applications.
		Automatic Control Systems pilot the development, design and manufacture of all forms of pedestrian and vehicle access control with hundreds of installations worldwide; travel to or visit some of the most popular sites in the world and you will most assuredly encounter some of our access control equipment, with perimeter security and safety features.
		Automatic Systems provide quality equipment for Pedestrian Access Control, Parking Systems and Vehicle Access Control, Public Transportation, and Gates for Toll and Traffic Management.
	www.automaticsystems.com (273 words)

	Automatic frequency control -- Britannica Student Encyclopedia (Site not responding. Last check: 2007-11-04)
		These controls are (1) the channel switch, which connects the required circuits to the radio-frequency amplifier and superheterodyne mixer to amplify and convert the sound and picture carriers of the desired channel; (2) a fine-tuning control, which precisely adjusts the...
		At the input terminals of the receiver, the picture and sound signals are at their weakest, so particular care must be taken to control noise at this point.
		device for controlling an aircraft in its flight pattern without frequent human intervention; also used in ships, rockets, and missiles; combination of gyroscopes and computer technology; consists of steering commands, motion and position sensors, computer that compares actual motion and position to those specified in guidance program, and servometers that activate...
	www.britannica.com /ebi/article-9316762?tocId=9316762 (772 words)

	Automatic Control Systems - Access Control Equipment and Perimeter Security Management
		They are ideal where high levels of pedestrian entrance control are required that also need that extra color or design flair.
		They are ideal where high levels of pedestrian entrance control are required that also need that "extra" touch or elegance.
		Control Panels are custom created to complement the number of lanes required and the needs of the security officers overseeing the venue.
	www.automaticsystems.com /project_portfolio.asp (1836 words)

	New Haven Westinghouse Automatic Control Electric Clocks
		With automatic control, if the owner had initially set the automatic control to “1” and set the clock to time, the owner knows this: If the clock is running, it is within one minute of the correct time.
		If the power is off long enough for the automatic control timer to time out, it will lock the wheel carrying the seconds hand, and the clock will not start again when the power is restored.
		The escapement of the automatic control timer is shown at the lower left in the above photo.
	clockhistory.com /newhavenwestinghouse (833 words)

	Elements of Automatic Control
		A control system is a system of integrated elements whose function is to maintain a process variable at a desired value or within a desired range of values.
		Control system input is the stimulus applied to a control system from an external source to produce a specified response from the control system.
		A controlled variable is the process variable that is maintained at a specified value or within a specified range.
	www.tpub.com /doeinstrument/instrumentationandcontrol69.htm (334 words)

	Solar Control Strategies, automatic and manual solar controls
		This unit is called the AC-600 and is entirely hydraulic, using the existing suction and pressure sides of a pump to either open or close a bladder valve as dictated by the sensor placed on the roof.
		The use of an automatic control system fully automates the solar system by using a microprocessor based differential control, sensors on the roof and in the pool water, and a motorized valve to direct the flow of the water.
		When the the control detects via a 10,000 ohm thermister on the roof that the temperature is 5-10 deg.
	www.flasolar.com /auto_man.htm (467 words)

	High-Speed Network Traffic Management: Automatic Control Approach
		From the automatic control point of view, there is a set of automatic control systems that have different control rates and respond to the input force changes in appropriate time intervals (short or long).
		The aims of the control are to maintain the number of cells in the VB queue at a desired setpoint and protect the buffer from overflow.
		The main steps of automatic control methodology include the hierarchical representation of management systems and the formal definitions of input variables, object and goal of control of each management level in terms of automatic control theory.
	www.isoc.org /inet97/proceedings/F6/F6_2.HTM (2912 words)

	Automatic Insect Control
		is an automatic insect control system that has proven to be a vital option for horse or livestock facilities, it is also very popular for outdoor recreational areas such as pools, patios, and backyards.
		Also new this year is an an optional remote control unit for the timer that allows for additional applications of insecticide without opening the timer box and switching to manual mode.
		As with any method of insect control, when used in an animal setting, the Automist system should be used in conjunction with good manure management, moisture control and general farm sanitation.
	www.greenwoodsporthorses.com /Automist.htm (1189 words)

	Apache Technologies, Inc. - TORNADO F1™ Automatic Blade Control
		Automatic laser machine control is a proven method for dramatically increasing the productivity and accuracy of grading equipment.
		Laser blade control is used on construction grading machinery to automatically control the blade in earthmoving and grading applications.
		An entry level model CB24+ control box works with proportional time (bang-bang) valves only and is designed to work with BULLSEYE 3+ receivers for slower moving applications such as trenchers and tile plows.
	www.apache-laser.com /product/tornadof1.htm (347 words)

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