US 5,293,585 AGranted

Industrial expert system

AssigneeKabushiki Kaisha Toshiba

InventorNoboru Morita

Life of this patent

Estimating the term…

Loading patent…

Abstract

An industrial expert system for use in designing a plant system or device thereof and in fault detection, includes a knowledge base having a rules-section for describing deductive inference rules. Also included is an expression-section for describing a calculation formula of equality with either a right side or left side being a simple term having a value and the other side being polynomial including known functions. Also included is an attributes-section for declaring the nature and value of each of the attributes cited in calculation and inference and for declaring parameters for controlling communication between a process of deductive inference and a calculation process according to calculation formulas. A deductive inference engine performs deductive inferencing on the basis of the rules, calculation formulae and the attributes stored in the knowledge base. This system uses a simple construction to efficiently perform detection of fault logic by using specific formula or calculation of parameters representing features of a fault which are to be performed during an inference.

Claims11

Dependent claims

An industrial expert system for use in designing a plant system or constituent devices thereof and in fault detection, said industrial expert system comprising:

a knowledge base including i) a rules-section for describing rules for deductive inference, ii) an expression-section for describing calculation formulas, each of said formulas having a single variable value to be determined on one side of an equation, the other side being expressed in the form of a polynomial including known functions, and iii) an attributes-section for declaring the nature and value of each attribute cited in a deductive inference and a calculation thereof, and for declaring parameters for controlling communication between a process of carrying out said deductive inference and a process of carrying out said calculation according to a calculation formula;
and
a deductive inference engine for executing a deductive inference, said inference engine including i) chaining means for processing said rules for deductive inference as well as a collection of the calculation formulas related to said rules stored in said knowledge base and for performing forward/backward inference chaining on the calculation formulas, and ii) means for searching said calculation formulas in order to enable use of calculation results in a conditional part of a rule for deductive inference.

Dependencies are inferred from the claim text.