Data processing: measuring – calibrating – or testing – Calibration or correction system – Sensor or transducer
Patent
1997-05-30
1999-09-28
Wachsman, Hal Dodge
Data processing: measuring, calibrating, or testing
Calibration or correction system
Sensor or transducer
702100, 702105, 702189, 702194, 706906, G01D 500
Patent
active
059603755
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), Sekine
patent: 5214576 (1993-05-01), Tani et al.
patent: 5241651 (1993-08-01), Ueda
patent: 5251124 (1993-10-01), Matsunaga
patent: 5305224 (1994-04-01), Hishida et al.
patent: 5353380 (1994-10-01), Zhang
patent: 5357879 (1994-10-01), Shiono et al.
patent: 5420578 (1995-05-01), O'Brien et al.
patent: 5642301 (1997-06-01), Warrior et al.
"The Application of Fuzzy Control Systems to Industrial Processes," P. J. King et al., Automatica, vol. 13, 1977, pp. 235-242. (No Date With Month).
"A Control Engineering Review of Fuzzy Systems," R.M. Tong, Automatica, vol. 13, 1977, pp. 559-569. (No Date With Month).
"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, pp. 1123-1126. (No Date With Month).
"Fuzzy Logic in Control Systems: Fuzzy Logic Controller--Part I," C.C. Lee, IEEE Transactions on Systems, Man, and Cybernetics, vol. 20, No. 2, Mar./Apr. 1990, pp. 404-418.
"Fuzzy Logic in Control Systems: Fuzzy Logic Controller--Part II," C.C. Lee, IEEE Transactions on Systems, Man, and Cybernetics, vol. 20, No. 2, Mar./Apr. 1990, pp. 419-435.
News Release: Omron Electronics, Inc., Schaumburg IL, Jul. 30, 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.
Brigham Scott E.
Lenz Gary A.
Warrior Jogesh
Rosemount Inc.
Wachsman Hal Dodge
LandOfFree
Transmitter with improved compensation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Transmitter with improved compensation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transmitter with improved compensation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-715722