Vol.1, No 5, 1998 pp. 573 - 580
UDC:510.64:681.527.3
APPLICATION OF THE MULTIPLE-VALUED LOGIC
TO DETECTING IRREGULAR STATES IN THE ELECTRO-PNEUMATIC SYSTEMS
Ž. Tasić1, M. Stojiljković1, D. Stojiljković2,
V. Blagojević3
1Faculty of Mechanical Engineering, University of Niš, Beogradska
14, 18000 Niš, Yugoslavia
e-mail: misa@masfak,asfak.ni.ac.yu
2Faculty of Technology, University of Niš, Bulevar Oslobođenja
124, 16000 Leskovac, Yugoslavia
3Faculty of Mechanical Engineering, University of Belgrade,
27. marta 80, 11000 Belgrade, Yugoslavia
Abstract. The paper discusses application of THE multiple-valued
(three-valued) logic to diagnosing the electro-pneumatic system operation
as well as to detecting irregular states in actuating elements. In doing
this, the work fluid pressure values are divided into three ranges so that
for each range there is one of the logical values of three-valued variable
xi??0,1,2?corresponding to it. The respective signal generation is done
by means of built-in transducers for translating non-electric values into
electric ones. By the combining multiple-valued digital circuit whose input
variables xi, signals are generated on the basis of which the process
flow is controlled as well as an irregular device operation is detected.
Key words: Pneumatic System, State Diagnostics, Multiple-valued
(Three-valued) Logic, Actuating Element, Electromagnetic Manifold
PRIMENA VIŠEZNAČNE LOGIKE U OTKRIVANJU
NEREGULARNIH STANJA KOD ELEKTRO-PNEUMATSKIH SISTEMA
U radu se razmatra primena višeznačne (troznačne) logike za dijagnosticiranje
rada elektro-pneumatskih sistema i otkrivanje neregularnih stanja kod izvršnih
eleme-nata. Pri tome su vrednosti pritiska radnog fluida podeljene u tri
opsega tako da svakom opsegu odgovara jedna od logičkih vrednosti troznačne
promenljive xi??0,1,2?. Generi-sa---nje odgovarajućih signala vrši se pomoću
ugrađenih pretvarača neelektričnih u električne veličine. Kombinacionim
višeznačnim digitalnim kolom čije su ulazne promenljive xi, generišu
se signali na osnovu kojih se kontroliše tok procesa i detektuje neregularan
rad uređaja.
Ključne reči: pneumatski sistem, dijagnostika stanja,
višeznačna (troznačna) logika, izvršni element, elktromagnetni razvodnik
