Programmable controller with fuzzy control function, fuzzy control process and fuzzy control monitoring process
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United States of America Patent
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Nov 9, 1993
Issued Date -
N/A
app pub date -
Nov 25, 1992
filing date -
Oct 24, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A programmable controller (PC) to which fuzzy logic principles have been applied is disclosed. The controller improves operational speed by performing several of the fuzzy logic functions in the A/D and D/A converters traditionally used in PC units, thereby allowing portions of a fuzzy logic control operation to proceed in parallel and independently. The invention dispenses with the use of look-up tables and the like for fuzzy membership functions, fuzzy output functions, etc., by defining the functions in terms of (typically) three points in an orthogonal coordinate system, saving memory space. The invention also includes a fuzzy control process having the described aspects and a method of monitoring a PC or PCs having a fuzzy control function.
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