United States Patent m
Dubost et al.
[54] DIAGNOSTIC METHOD FOR AN EVOLUTIONARY PROCESS
[75] Inventors: Laurent Dubost, Paris; Jean-Noel
Heude, Argenteuil, both of France
[73] Assignee: Thomson-CSF, Paris, France
[21] Appl. No.: 182,153
[22] PCT Filed: Jun. 2,1993
[86] PCT No.: PCT/FR93/00527
§ 371 Date: Feb. 1,1994
§ 102(e) Date: Feb. 1,1994 [87] PCT Pub. No.: WO93/24808
PCT Pub. Date: Dec. 9,1993
[30] Foreign Application Priority Data
Jun. 3, 1992 [FR] France 92 06708
[51] Int. CI.6 G01D 1/14; G05B 23/02
[52] U.S. CI 364/551.01; 395/904; 395/912
[58] Field of Search 364/551.01,551.02,
364/550, 468, 469, 474.16, 581, 578; 395/924.4, 904, 912, 3, 50-51, 61, 906, 914
lllllllllll.l' lllllllllllllllllll .llllllllllllllllllllllllllllll. Illl
US005511004A
[ii] Patent Number: 5,511,004 [45] Date of Patent: Apr. 23,1996
[56] References Cited
U.S. PATENT DOCUMENTS
4,644,479 2/1987 Kemper et al 364/550
5,009,833 4/1991 Takeuchi et al 364/924.4 X
5,070,468 12/1991 Niinomi et al 364/550
5,089,978 2/1992 Lipneretal 364/551.01
5,099,436 3/1992 McCown et al 364/550
5,132,920 7/1992 Bellows et al 364/551.01
5,210,704 5/1993 Husseiny 364/551.01
5,285,376 2/1994 Struger et al. 364/147
5,351,200 9/1994 Impink, Jr. 364/550
5,357,449 10/1994 Oh 364/551.01
Primary Examiner—Emanuel T. Voeltz
Assistant Examiner—Melanie Kemper
Attorney, Agent, or Firm—Obion, Spivak, McClelland,
Maier & Neustadt
[57] ABSTRACT
The method of the invention establishes a reference state and a current state for an industrial evolutionary process from physical parameters measured on all the equipment items employing the evaluating process. These two states are compared, parameter by parameter, by resorting to fuzzy logic for classifying the quantities, and a diagnosis is established using expert rales.
11 Claims, 3 Drawing Sheets
