Temperature prediction transmitter
AssigneeInvensys Systems, Inc.
InventorSpencer K. Howe
Life of this patent
Estimating the term…
Abstract
A system and method is pro vided for predicting a physical quality such as temperature, the measurement of which tends to be hindered by a time-related impediment. A single sensor is configured to detect, in real time, the physical quality Qdetect, and one or more infinite impulse response filters are configured with time constants correlated to the time-related impediment. The infinite impulse filter(a) are configured to filter Qdetect to output a filtered quality measurement (Qfiltered). A processor is configured to calculate, in real time, the estimated or predicted quality Qestimate using Qdetect and Qfiltered.
Claims43
A system for predicting a physical quality with an impediment to accurate measurement, comprising:
- a sensor configured to detect, in real time, the physical quality (Qdetect), wherein measurement of the physical quality is subject to a time-related impediment;
- a first infinite impulse response filter configured to filter Qdetect and to output a first filtered quality measurement (Qfiltered1);
- a processor configured to calculate, in real time, the estimated quality Qestimate using Qdetect and Qfiltered1;
- a second infinite impulse response filter configured to filter Qfiltered1 and to output a second filtered quality measurement (Qfiltered2);
- wherein said processor is configured to calculate the estimated quality Qestimate using Qfiltered1 and Qfiltered2;
- an additional infinite impulse response filter configured to filter Qfiltered1 and to output an additional filtered quality measurement (Qfilteredadd);
- wherein said processor is configured to calculate the estimated quality Qestimate using Qfilteredadd;
- and wherein said processor is configured to calculate the estimated quality Qestimate using the formula Qestimate=Qdetect+(Qdetect−Qfiltered2)+(Qdetect−Qfilteredadd).
A method for transforming physical quality data into an estimated measured quality, comprising:
- a) obtaining, with a sensor in real time, data representing a physical quality (Qdetect), wherein an impediment exists to the detection of the physical quality;
- b) filtering Qdetect through a first IIR filter (IIR1), wherein the IIR outputs Qfiltered1;
- c) calculating, with a processor in real time, the estimated measured quality (Qestimate) using (Qfilterd1 and Qdetect;
- and
- d) filtering Qfiltered1 through another infinite impulse response filter configured to output another filtered quality measurement (Qfiltered2);
- and
- wherein said calculating (c) includes calculating the estimated quality Qestimate using Qfiltered1 and Qfiltered2.
A system for predicting a physical quality with an impediment to accurate measurement, comprising:
- a sensor configured to detect, in real time, the physical quality (Qdetect), wherein measurement of the physical quality is subject to a time-related impediment;
- a first infinite impulse response filter configured to filter Qdetect and to output a first filtered quality measurement (Qfiltered1);
- a processor configured to calculate, in real time, the estimated quality Qestimate using Qdetect and Qfiltered1;
- a second infinite impulse response filter configured to filter Qfiltered1 and to output a second filtered quality measurement (Qfiltered2);
- and
- wherein said processor is configured to calculate the estimated quality Qestimate using Qfiltered1 and Qfiltered2;
- wherein the quality comprises temperature of a material and the impediment comprises a barrier disposed between the sensor and the material;
- wherein the material comprises a process fluid and the barrier comprises a casing disposed about the temperature sensor;
- and
- wherein the casing is configured for extension into process fluid flow.
A method for transforming physical quality data into an estimated measured quality, comprising:
- a) obtaining, with a sensor in real time, data representing a physical quality Qdetect), wherein an impediment exists to the detection of the physical quality;
- b) filtering Qdetect through a first IIR filter (IIR1), wherein the IIR1 outputs Qfiltered1;
- c) calculating, with a processor in real time, the estimated measured quality (Qestimate) using Qfiltered1 and Qdetect;
- and further comprising recording, with the processor, a plurality of data points of Qdetected over time and determining, with the processor, in real time, the slope of Qdetected at the plurality of data points.
A system for predicting a physical quality with an impediment to accurate measurement, comprising:
- a sensor configured to detect, in real time, the physical quality (Qdetect), wherein measurement of the physical quality is subject to a time-related impediment;
- a first infinite impulse response filter configured to filter Qdetect and to output a first filtered quality measurement (Qfiltered1);
- a processor configured to calculate, in real time, the estimated quality Qestimate using Qdetect,
- wherein said processor is configured for recording of a plurality of data points of Qdetected over time;
- and
- wherein said processor is configured for determining the slope of Qdetected at the plurality of data points.
Dependencies are inferred from the claim text.