Computer control system utilizing knowledge processing

• US 4,740,886 A
• Filed: 11/01/1985
• Issued: 04/26/1988
• Est. Priority Date: 11/02/1984
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Morooka, Yasuo, Tanifuji, Shinya
• Primary Examiner(s): Smith, Jerry
• Assistant Examiner(s): Lastova, John R.
• Application Number:
  US06/793,773
• Time in Patent Office: 907 Days
• Field of Search: 364/148-151, 364/164, 364/165, 364/513, 364/477
• US Class Current: 700/30
• CPC Class Codes: G05B 13/028 using expert systems only
• CPC Class Codes: Y10S 706/906 Process plant
• CPC Class Codes: Y10S 706/922 Computer program preparation

Abstract

A computer control system utilizing mathematical formula processing and more broadly knowledge engineering is characterized by a man-machine processing unit for defining a mathematical formula model, a program generation unit for converting the defined mathematical formula model to an intermediate code program, a storage device for storing usage conditions (rules) of the defined mathematical formula models and a unit for selecting a mathematical formula model which meets the stored usage condition based on data from a control unit of a plant under control, selecting a program corresponding to the selected mathematical formula model from the programs generated by the program generation unit, and supplying an operation result by the selected program to the control unit.

Claims

1. In a control system of a plant, a computer control system utilizing knowledge processing comprising:

first and second storage means for storing a plurality of mathematical models representing a control strategy and usage conditions for the mathematical models, respectively;

program generating means, responsive each time a mathematical model is stored in said first storage means, for generating an executable program of the mathematical model and for converting said executable program to an intermediate code program;

third storage means connected to said program generation means for storing intermediate code programs provided thereby;

comparing means for sequentially comparing status data and control specification data of a plant to be controlled as supplied from a control unit with the usage conditions of the mathematical models stored in said second storage means;

means responsive to said comparing means finding correspondence between said supplied status and specification data and a stored usage condition for selecting the mathematical model for that usage condition from said first storage means;

interpreter means responsive to selection of a mathematical model by said selecting means for executing the intermediate code program corresponding to the selected mathematical model to produce a calculated result; and

means for controlling the plant in accordance with the calculated result given by said interpreter means.

2. A computer controlling system utilizing knowledge processing according to claim 1, wherein said plurality of mathematical models and said usage conditions therefor comprise cost functions and restriction conditions for the plant under control.

3. A computer control system utilizing knowledge base according to claim 1, wherein each mathematical model is related with a mathematical model name, and a usage condition for each mathematical model comprises a presumption portion representing a condition for the use of the mathematical model and a conclusion portion including the corresponding mathematical formula model name.