Transmitter with improved compensation

Details Transmitter with improved compensation Transmitter with improved compensation

1994-01-25

1997-06-24

Voeltz, Emanuel T.

Boots, shoes, and leggings

36457101, 364138, 395 3, 395 61, 395900, 395906, G01F 108

Patent

active

056423012

ABSTRACT:
A circuit for compensating variables in a measurement transmitter. Within the transmitter, a sensor senses a primary process variable such as differential pressure and a converter digitizes the sensed process variable. The sensor senses pressures within a span of pressures values. A memory inside the transmitter stores at least two membership functions, each membership function having a non-zero value over a predetermined region of the process variable span and a substantially zero value over the remainder of the span. The memory also stores a set of compensation formulas, each formula corresponding to a membership function. A selection circuit in the transmitter selects those membership functions which have a non-zero value at the digitized process variable and a correction circuit provides at least one correction value, each correction value calculated from a compensation formula corresponding to a selected membership function. A weighting circuit multiplies each correction value by its corresponding selected membership function, and combines the multiplicands to provide a compensated process variable. The compensated process variable is coupled to a control circuit connecting the transmitter to a control system.

REFERENCES:
patent: 4161880 (1979-07-01), Prosky
patent: 4437164 (1984-03-01), Branch, III
patent: 4926364 (1990-05-01), Brotherton
patent: 5043862 (1991-08-01), Takahashi et al.
patent: 5083288 (1992-01-01), Somlyody et al.
patent: 5161110 (1992-11-01), Dorchak
patent: 5186150 (1993-02-01), Sehine
patent: 5214576 (1993-05-01), Tani et al.
patent: 5241651 (1993-08-01), Ueda
patent: 5353380 (1994-10-01), Zhang
patent: 5357879 (1994-10-01), Shiono et al.
"The Application of Fuzzy Control Systems to Industrial Processes," P.J. King et al., Automatica, vol. 13, 1977, pp. 235-242.
"A Control Engineering Review of Fuzzy Systems," R.M. Tong, Automatica, vol. 13, 1977, pp. 559-569.
"Development of Fuzzy Algorithms for Servo Systems," Y.F. Li et al., IEEE Control Systems Magazine, Apr. 1989, pp. 65-71.
"Fuzzy Logic Issues for Process Control," M. Spinrad et al., Honeywell Inc., ISA Paper, 1990, Document No. 0065-2814/90/1123-1128.
"Fuzzy Logic in Control Systems: Fuzzy Logic Controller--Part I, Part II" C.C. Lee, IEEE Transactions on Systems, Man, and Cybernetics, vol. 20, No. 2, Mar./Apr. 1990, pp. 404-435.
News Release: Omron Electronics, Inc., Schaumburg IL, Jul. 20, 1991.
"Fuzzy Logic Improves on PID Tuning," K. Parker Chemical Processing, Oct. 1991, pp. 31-32.
"Fuzzy-Logic Basics: Intuitive Rules Replace Complex Math," D. Brubaker, EDN, Jun. 18, 1992, pp. 111-116.

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