expert control system

expert control system

[¦ek‚spərt kən′trōl ‚sis·təm]
(control systems)
A control system that uses expert systems to solve control problems.

Expert control system

A type of intelligent control system which can emulate the reasoning procedures of a human expert in order to generate the necessary control action. Expert control systems seek to incorporate knowledge about control system design, practical operations, and abnormal system recovery plans to automate tasks normally performed by experienced control engineers (the experts). Techniques relating to the field of artificial intelligence are usually used for the purpose of acquiring and representing knowledge and for generating control decisions through an appropriate reasoning mechanism. As it operates essentially on a knowledge base, an expert control system is often referred to as a knowledge-based control system. One of the most important benefits associated with the use of an expert control system is the inherent capability of the system to deal with uncertainty in information. Information provided to these systems can be general, qualitative, or vague because, like humans, expert control systems possess functionalities to perceive, reason, infer, and deduce new information. They can learn, gain new knowledge, and improve their performance through experience.

The principal components almost certain to be present in all expert control systems are the knowledge source, the database, the inference engine, the control algorithms, and the interface between the expert control system and humans (see illustration).

Central to an expert system is the knowledge source (or knowledge base), which contains knowledge in a specific domain (control in this context). This knowledge consists of domain-specific facts and heuristics, usually in the form of rules or frames, useful for solving problems in the domain.

The database is a short-term memory component which contains the current problem status, inference states, and the history of solutions to date for reference purposes.

The inference engine operates on the information from the knowledge source, from the associated database, or from the user; guides the search process according to the programmed strategy and search algorithms; and uses the inferencing mechanisms, usually in the forms of rules of logic, to solve problems, arrive at conclusions, and activate the final control actions.

The control algorithms are the tools for the expert systems to perform the final control action. A rich library of control algorithms, with advanced features, is usually made available.

The user interface allows the user to interact with the overall system, browse through the knowledge source, edit rules, and perform many other interactive tasks. See Artificial intelligence, Control systems, Expert systems, Process control

References in periodicals archive ?
Earlier, in 2010, Emerson Process Management was selected to install its Ovation expert control system at Rabigh Power Plant units 1 and 2 owned by SEC.
To earn ENERGY STAR status, CalPortland took the following actions: Utilized an extensive Energy Management program to promote energy efficiency best practices at each of its facilities and for all of its employee's; installed a kiln expert control system at the Rillito plant to reduce the kiln process fuel intensity; and completed the installation of a new gas conditioning tower with a baghouse modification that led to a 2.6 million kWh per year savings for the Rillito plant.
Automation technologies will include Emerson s Ovation expert control system, RosemountA wireless measurement and analytical equipment, AMS Suite predictive maintenance software, and CSI Monitor for turbine vibration analysis.
The Group has also launched the Energy-saving Expert Control System, which combines the functions of energy management, energy-saving analysis and control.
Release date- 19072011 - PITTSBURGH - Emerson Process Management has modernized steam turbine controls at the GIM Channelview Cogeneration LLC plant with its Ovation expert control system.
Emerson technologies provided under the contract include PlantWeb digital plant architecture with the Ovation expert control system, Rosemount measurement and analytical instruments, Smart Wireless networks, Scenario simulation technology for operator training, and AMS Suite predictive maintenance software.
The plant will use its FrothCon and Expert Control system and will be supported by a Courier analyzer system to provide timely and accurate on-line assays.
Eimco Process Machinery's KnowledgeScape expert control system has been installed at a number of Chilean mines, including Candelaria (Phelps Dodge/Sumitomo), Los Pelambres (Antofagasta plc/Japanese consortium), Chuquicamata (Codelco), and El Soldado (Exxon Minerals), as well as at several operations in Peru.
Svedala Cisa has been awarded the contract to develop and install the advanced expert control system on the 13 regrind lines at the Iron Ore Company of Canada's concentrator in Labrador City, Newfoundland.
A plant wide expert control system was installed at this Pegasus Gold operation in 1994.
Typically, the first two objectives of an expert control system are increased throughput and increased recovery because these gains produce the greatest economic benefits.
Flotation has recently seen significant advances in expert control systems and process monitoring.

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