US6017143A
Expired / Lapsed
US
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Device in a process system for detecting events
Assignee: Rosemount Inc
•
Filing: 1996-03-28
•
Granted: 2000-01-25
•
Expires: 2016-03-28
Abstract
Abstract A process device couples to a process control loop. The process device receives process signals. A memory in the process device contains a nominal parameter value and a rule. Computing circuitry calculates a statistical parameter of the process signal and operates on the statistical parameter and the stored nominal value based upon the stored rule and responsively provides an event output based upon the operation. Output circuitry provides an output in response to the event output.
Inventors
- 👤 Evren Eryurek
- 👤 Jogesh Warrior
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:24
CPC Classifications
G; G05; G05B; G05B23/00; G05B23/02; G05B23/0205; G05B23/0218; G05B23/0221; G05B13/00; G05B13/02; G05B13/0265; G05B13/0275; G05B21/00; G05B21/02; G05B23/0259; G05B23/0275; G05B23/0278
Claims Analysis
Total Claims: 70
Claim 1
Independent Claim
110 words
A process device coupled to a process control loop, comprising: a process signal input providing a process signal related to a process; memory containing a trained parameter representative of statistical function of an observed process signal and a rule; computing circuitry calculating a current parameter representative of a statistical function of the process signal and operating on the current parameter and the trained parameter based upon the rule to thereby recognize a pattern in the process signal associated with a failure event and responsively providing a failure event output in response to an event in the process detected based upon the operation; and output circuitry outputting the failure event output.
Claim 2
Dependent Claim
110 words
A process device coupled to a process control loop, comprising: a process signal input providing a process signal related to a process; memory containing a trained parameter representative of statistical function of an observed process signal and a rule; computing circuitry calculating a current parameter representative of a statistical function of the process signal and operating on the current parameter and the trained parameter based upon the rule to thereby recognize a pattern in the process signal associated with a failure event and responsively providing a failure event output in response to an event in the process detected based upon the operation; and output circuitry outputting the failure event output.
Claim 3
Dependent Claim
26 words
The apparatus of claim 1 wherein the memory further contains a sensitivity parameter and the failure event output is formed or based upon the sensitivity parameter.
Claim 4
Dependent Claim
33 words
The apparatus of claim 1 wherein the process control loop is selected from the group consisting of two wire process control loops, three wire process control loops and four wire process control loops.
Claim 5
Dependent Claim
19 words
The apparatus of claim 1 wherein the device is completely powered with power received from the process control loop.
Claim 6
Dependent Claim
28 words
The apparatus of claim 1 wherein the statistical function is selected from the group consisting of standard deviation, mean, sample variance, root-mean-square (RMS), range, and rate of change.
Claim 7
Dependent Claim
21 words
The apparatus of claim 1 wherein the computing circuitry provides the failure event output based upon a plurality of statistical functions.
Claim 8
Dependent Claim
21 words
The apparatus of claim 1 wherein the rule is selected from the group consisting of spike, drift, bias, noise and stuck.
Claim 9
Dependent Claim
19 words
The apparatus of claim 1 wherein the computing circuitry comprises fuzzy logic and the rule employs a membership function.
Claim 10
Dependent Claim
32 words
The apparatus of claim 8 including a fuzzy membership function stored in the memory and wherein computation circuitry applies the membership function to the trained parameter prior to operation of the rule.
Claim 11
Dependent Claim
23 words
The apparatus of claim 1 wherein the process signal input comprises a sensor input channel and the process signal comprises a process variable.
Claim 12
Dependent Claim
37 words
The apparatus of claim 10 wherein the sensor input channel includes: a sensor providing a sensor output related to the process; and an analog to digital converter which converts the sensor output into a digitized process variable.
Claim 13
Dependent Claim
31 words
The apparatus of claim 11 wherein the sensor is selected from the group consisting of pressure, temperature, pH, flow, turbidity, level sensors, position, conductivity, motor current, motor back emf and vibration.
Claim 14
Dependent Claim
22 words
The apparatus of claim 1 wherein the process signal input comprises a control channel and the process signal comprises a control signal.
Claim 15
Dependent Claim
25 words
The apparatus of claim 13 wherein the control channel includes: a control element for controlling the process; and an actuator for actuating the control element.
Claim 16
Dependent Claim
28 words
The apparatus of claim 1 wherein the process signal input comprises input circuitry coupled to the control loop to receive the process signal from the process control loop.
Claim 17
Dependent Claim
26 words
The apparatus of claim 1 wherein the output circuitry couples to the process control loop and transmits the failure event output on the process control loop.
Claim 18
Dependent Claim
22 words
The apparatus of claim 1 wherein the output circuitry comprises user output circuitry for outputting the failure event output to a user.
Claim 19
Dependent Claim
31 words
The apparatus of claim 1 wherein process signal input comprises a diagnostic channel and the process signal comprises a diagnostic signal related to a control element used to control the process.
Claim 20
Dependent Claim
22 words
The apparatus of claim 18 wherein the diagnostic signal is selected from the group consisting of valve stem position, force, and pressure.
Claim 21
Dependent Claim
22 words
The apparatus of claim 14 wherein the actuator comprises a motor and the control element comprises a pump operated by the motor.
Claim 22
Dependent Claim
23 words
The apparatus of claim 1 including an inference engine coupled to the failure event output for performing diagnostics on the process control loop.
Claim 23
Dependent Claim
27 words
The apparatus of claim 2 wherein the computing circuitry monitors the current parameter during normal operation of the process control loop and thereby generates the trained parameter.
Claim 24
Dependent Claim
21 words
The process control device of claim 1 wherein the trained parameter is related to the process when the process has settled.
Claim 25
Dependent Claim
129 words
A transmitter in a process control loop, comprising: a sensor sensing a process variable; an analog to digital converter coupled to the sensor having a digitized process variable output; a memory containing a trained parameter representative of statistical function of an observed process variable and a rule; computation circuitry coupled to the memory and the analog to digital converter, the computation circuitry calculating a current parameter representative of a statistical parameter of the digitized processed variable, operating on the current parameter based upon the rule and the trained parameter to thereby recognize a pattern in the process signal associated with a failure event and responsively providing a process failure event output; and output circuitry coupled to the process control loop outputting the process failure event output onto the loop.
Claim 26
Dependent Claim
129 words
A transmitter in a process control loop, comprising: a sensor sensing a process variable; an analog to digital converter coupled to the sensor having a digitized process variable output; a memory containing a trained parameter representative of statistical function of an observed process variable and a rule; computation circuitry coupled to the memory and the analog to digital converter, the computation circuitry calculating a current parameter representative of a statistical parameter of the digitized processed variable, operating on the current parameter based upon the rule and the trained parameter to thereby recognize a pattern in the process signal associated with a failure event and responsively providing a process failure event output; and output circuitry coupled to the process control loop outputting the process failure event output onto the loop.
Claim 27
Dependent Claim
25 words
The transmitter of claim 24 wherein the memory further contains a sensitivity parameter and the failure event output is further based upon the sensitivity parameter.
Claim 28
Dependent Claim
19 words
The transmitter of claim 24 wherein the device is completely powered with power received from the process control loop.
Claim 29
Dependent Claim
26 words
The transmitter of claim 24 wherein the rule is selected from the group consisting of signal spike, signal drift, signal bias, signal noise and signal stuck.
Claim 30
Dependent Claim
22 words
The transmitter of claim 24 wherein the sensor is selected from the group consisting of pressure, pH, flow, turbidity and level sensors.
Claim 31
Dependent Claim
21 words
The transmitter of claim 24 including compensation circuitry coupled to the analog to digital converter for compensating the digitized process variable.
Claim 32
Dependent Claim
27 words
The transmitter of claim 25 wherein the computing circuitry monitors the current parameter during normal operation of the process control loop and thereby generates the trained parameter.
Claim 33
Dependent Claim
54 words
The transmitter of claim 24 wherein the computation circuitry calculates standard deviation and range of the digitized process variable and responsively provides a noise detected output if a current standard deviation is greater than a trained standard deviation times a sensitivity parameter (β) and if a current range is greater than a trained range.
Claim 34
Independent Claim
107 words
A method performed in a process device for detecting a process failure event in a process control system, comprising: obtaining a process signal related to a process variable; retrieving a rule from a memory; retrieving a trained parameter representative of statistical function of an observed process variable from the memory; calculating a current parameter representative of a statistical function of the process signal; comparing current parameter to the trained parameter in accordance with a relationship defined by the rule to thereby recognize a pattern in the process signal associated with a failure event; and responsively providing a process failure event output based upon the step of comparing.
Claim 35
Independent Claim
107 words
A method performed in a process device for detecting a process failure event in a process control system, comprising: obtaining a process signal related to a process variable; retrieving a rule from a memory; retrieving a trained parameter representative of statistical function of an observed process variable from the memory; calculating a current parameter representative of a statistical function of the process signal; comparing current parameter to the trained parameter in accordance with a relationship defined by the rule to thereby recognize a pattern in the process signal associated with a failure event; and responsively providing a process failure event output based upon the step of comparing.
Claim 36
Dependent Claim
23 words
The method of claim 32 including retrieving a sensitivity parameter and where the step of comparing is further based upon the sensitivity parameter.
Claim 37
Dependent Claim
13 words
The method of claim 32 wherein the process signal comprises a process variable.
Claim 38
Dependent Claim
13 words
The method of claim 32 wherein the process signal comprises a control signal.
Claim 39
Dependent Claim
13 words
The method of claim 32 wherein the process signal comprises a diagnostic signal.
Claim 40
Dependent Claim
28 words
The method of claim 33 including calculating a current parameter of the process variable during normal operation and storing the current parameter in memory as the trained parameter.
Claim 41
Dependent Claim
21 words
The method of claim 32 wherein the rules are selected from the group consisting of spike, drift, bias, noise and stuck.
Claim 42
Dependent Claim
28 words
The method of claim 32 wherein the function parameter is selected from the group consisting of standard deviation, mean, sample variance, root-mean-square (RMS), range, and rate of change.
Claim 43
Dependent Claim
16 words
The method of claim 32 wherein the step of comparing includes performing a fuzzy logic operation.
Claim 44
Dependent Claim
51 words
The method of claim 32 including calculating standard deviation and range of the process signal and responsively providing a noise detected output if a current standard deviation is greater than a trained standard deviation times a noise sensitivity parameter (β) and if a current range is greater than a trained range.
Claim 45
Dependent Claim
163 words
A transmitter coupled to a two wire process control loop which completely powers the transmitter, comprising: a process signal input providing a process signal related to a process comprising a sensor providing a sensor output related to the process, and an analog to digital converter which converts the sensor output into a digitized process variable; memory containing a trained parameter representative of statistical function of an observed process signal and a rule; computing circuitry providing a control signal output as a function of the digitized process variable and calculating a current parameter representative of a statistical function of the digitized process variable and operating on the current parameter and the trained parameter based upon the rule to thereby recognize a pattern in the process signal associated with a failure event and providing a failure event output in response to a failure event in the process detected based upon the operation; and output circuitry outputting the failure event output on the two wire loop.
Claim 46
Dependent Claim
163 words
A transmitter coupled to a two wire process control loop which completely powers the transmitter, comprising: a process signal input providing a process signal related to a process comprising a sensor providing a sensor output related to the process, and an analog to digital converter which converts the sensor output into a digitized process variable; memory containing a trained parameter representative of statistical function of an observed process signal and a rule; computing circuitry providing a control signal output as a function of the digitized process variable and calculating a current parameter representative of a statistical function of the digitized process variable and operating on the current parameter and the trained parameter based upon the rule to thereby recognize a pattern in the process signal associated with a failure event and providing a failure event output in response to a failure event in the process detected based upon the operation; and output circuitry outputting the failure event output on the two wire loop.
Claim 47
Dependent Claim
25 words
The apparatus of claim 42 wherein the memory further contains a sensitivity parameter and a failure event output is further related to the sensitivity parameter.
Claim 48
Dependent Claim
33 words
The apparatus of claim 42 wherein the process control loop is selected from the group consisting of two wire process control loops, three wire process control loops and four wire process control loops.
Claim 49
Dependent Claim
28 words
The apparatus of claim 42 wherein the statistical function is selected from the group consisting of standard deviation, mean, sample variance, root-mean-square (RMS), range, and rate of change.
Claim 50
Dependent Claim
20 words
The apparatus of claim 42 wherein the computing circuitry provides the event output based upon a plurality of statistical functions.
Claim 51
Dependent Claim
21 words
The apparatus of claim 42 wherein the rule is selected from the group consisting of spike, drift, bias, noise and stuck.
Claim 52
Dependent Claim
19 words
The apparatus of claim 42 wherein the computing circuitry comprises fuzzy logic and the rule employs a membership function.
Claim 53
Dependent Claim
32 words
The apparatus of claim 48 including a fuzzy membership function stored in the memory and wherein computation circuitry applies the membership function to the trained parameter prior to operation of the rule.
Claim 54
Dependent Claim
31 words
The apparatus of claim 42 wherein the sensor is selected from the group consisting of pressure, temperature, pH, flow, turbidity, level sensors, position, conductivity, motor current, motor back emf and vibration.
Claim 55
Dependent Claim
23 words
The apparatus of claim 42 including an inference engine coupled to the failure event output for performing diagnostics on the process control loop.
Claim 56
Dependent Claim
27 words
The apparatus of claim 43 wherein the computing circuitry monitors the current parameter during normal operation of the process control loop and thereby generates the trained parameter.
Claim 57
Dependent Claim
124 words
A process device coupled to a process control loop, comprising: a process signal input for providing a process signal related to a process, the process signal input comprising a control signal for controlling the process; memory containing a trained parameter representative of statistical function of an observed process signal and a rule; computing circuitry calculating a current parameter representative of a statistical function of the digitized process variable and operating on the current parameter and the trained parameter based upon the rule to thereby recognize a pattern in the process signal associated with a failure event and providing a failure event output in response to a failure event in the process detected based upon the operation; and output circuitry outputting the failure event output.
Claim 58
Dependent Claim
124 words
A process device coupled to a process control loop, comprising: a process signal input for providing a process signal related to a process, the process signal input comprising a control signal for controlling the process; memory containing a trained parameter representative of statistical function of an observed process signal and a rule; computing circuitry calculating a current parameter representative of a statistical function of the digitized process variable and operating on the current parameter and the trained parameter based upon the rule to thereby recognize a pattern in the process signal associated with a failure event and providing a failure event output in response to a failure event in the process detected based upon the operation; and output circuitry outputting the failure event output.
Claim 59
Dependent Claim
25 words
The apparatus of claim 53 wherein the memory further contains a sensitivity parameter and the failure event output is further based upon the sensitivity parameter.
Claim 60
Dependent Claim
33 words
The apparatus of claim 53 wherein the process control loop is selected from the group consisting of two wire process control loops, three wire process control loops and four wire process control loops.
Claim 61
Dependent Claim
19 words
The apparatus of claim 53 wherein the device is completely powered with power received from the process control loop.
Claim 62
Dependent Claim
28 words
The apparatus of claim 53 wherein the statistical function is selected from the group consisting of standard deviation, mean, sample variance, root-mean-square (RMS), range, and rate of change.
Claim 63
Dependent Claim
21 words
The apparatus of claim 53 wherein the computing circuitry provides the failure event output based upon a plurality of statistical functions.
Claim 64
Dependent Claim
21 words
The apparatus of claim 53 wherein the rule is selected from the group consisting of spike, drift, bias, noise and stuck.
Claim 65
Dependent Claim
19 words
The apparatus of claim 53 wherein the computing circuitry comprises fuzzy logic and the rule employs a membership function.
Claim 66
Dependent Claim
32 words
The apparatus of claim 60 including a fuzzy membership function stored in the memory and wherein computation circuitry applies the membership function to the trained parameter prior to operation of the rule.
Claim 67
Dependent Claim
23 words
The apparatus of claim 53 including input circuitry coupled to the control loop to receive the process signal from the process control loop.
Claim 68
Dependent Claim
21 words
The apparatus of claim 53 wherein the control signal is provided to an actuator comprising a motor thereby actuating a pump.
Claim 69
Dependent Claim
22 words
The apparatus of claim 53 including an inference engine coupled to the event output for performing diagnostics on the process control loop.
Claim 70
Dependent Claim
27 words
The apparatus of claim 54 wherein the computing circuitry monitors the current parameter during normal operation of the process control loop and thereby generates the trained parameter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-01-24 | 2003-07-26 | 2004-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-01-24 | 2007-07-26 | 2008-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-01-24 | 2011-07-26 | 2012-01-25 | $7700.00 | Window Closed / Lapsed |