CN116147824A - Intelligent self-diagnosis redundant pressure sensor and pressure monitoring method - Google Patents
Intelligent self-diagnosis redundant pressure sensor and pressure monitoring method Download PDFInfo
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- CN116147824A CN116147824A CN202211740950.9A CN202211740950A CN116147824A CN 116147824 A CN116147824 A CN 116147824A CN 202211740950 A CN202211740950 A CN 202211740950A CN 116147824 A CN116147824 A CN 116147824A
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- 238000004092 self-diagnosis Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000012544 monitoring process Methods 0.000 title claims abstract description 8
- 238000012545 processing Methods 0.000 claims abstract description 32
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 239000000945 filler Substances 0.000 claims description 12
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 230000003750 conditioning effect Effects 0.000 claims description 5
- 239000011324 bead Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 230000001629 suppression Effects 0.000 claims description 4
- 230000001052 transient effect Effects 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 2
- 210000001503 joint Anatomy 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 3
- 239000003245 coal Substances 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract description 2
- 238000003745 diagnosis Methods 0.000 description 3
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- 238000005259 measurement Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
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- 238000012935 Averaging Methods 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/08—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of piezoelectric devices, i.e. electric circuits therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/007—Malfunction diagnosis, i.e. diagnosing a sensor defect
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention provides an intelligent self-diagnosis redundant pressure sensor and a pressure monitoring method, wherein the pressure sensor comprises a redundant sensitive core body, a conversion circuit, a self-diagnosis signal processing circuit and an electric connector; the redundant sensitive core body converts the medium pressure of a non-electric pipeline into a multi-path millivolt-level voltage signal; the conversion circuit converts the multi-path millivolt voltage signals into the same standard voltage signals; the self-diagnosis signal processing circuit performs multi-channel standard voltage signal cross comparison, or converts the multi-channel standard voltage signal into a corresponding pressure signal, then judges and votes, outputs a final pressure signal and a multi-channel signal actual working state signal, and leads the final pressure signal and the multi-channel signal actual working state signal to the electric connector. The pressure sensor can measure the pipeline pressure and can perform self-diagnosis, thereby avoiding the use defect that the conventional sensor needs to be periodically detected and maintained, and meeting the requirements of high reliability and maintenance free of the reused liquid coal engine.
Description
Technical Field
The invention belongs to the technical field of pressure sensors, and particularly relates to an intelligent self-diagnosis redundant pressure sensor and a pressure monitoring method.
Background
The new generation of reusable liquid oxygen kerosene engine realizes the thrust closed-loop control by measuring and controlling the pressure of the ignition path of the thrust chamber, and the specific method is that the pressure sensor is used for measuring the pressure of the ignition path of the thrust chamber, the controller collects the output signal of the pressure sensor, the controller adopts the obtained pressure signal to convert the thrust value, and if the converted thrust value is within the preset thrust value range, the engine keeps the current state to continue working; and if the converted thrust value exceeds the preset thrust value range, regulating the flow of the engine to realize thrust control.
Because the output signal of the pressure sensor is used for controlling the thrust of the engine, the reliability of the operation, the accuracy of the output signal and the working state of the sensor are key preconditions for accurate control of the thrust for a long time. The traditional combination mode of pressure sensor measurement and controller collection can realize high-precision measurement, but is single-channel signal output and large in size and weight, and reliability risks exist in the process of multiple use, periodic test maintenance is needed, and the requirements of high reliability and maintenance-free of a reused liquid coal engine cannot be met.
Disclosure of Invention
In order to overcome the defects in the prior art, the inventor performs intensive research and provides an intelligent self-diagnosis redundant pressure sensor, which is used for firstly converting millivolt voltage signals output by a redundant sensitive core into identical standard signals, then judging and voting the output signal states of a multi-channel sensor through a self-diagnosis signal processing circuit, averaging the determined reliable signals to be used as final output signals of the sensor, and outputting the working states of the multi-channel signals of the sensor. The functions of the existing multiple sensors and controllers are integrated into one sensor, so that the pipeline pressure can be measured, the self-diagnosis can be realized, and the use defect that the existing sensor needs to be periodically detected and maintained is avoided; meanwhile, the multipath signals output identical voltage values, so that the use flow of the sensor is simplified, and the defects of complex multi-link use method, low efficiency, high labor cost and easiness in error of the traditional sensor are overcome.
The technical scheme provided by the invention is as follows:
in a first aspect, an intelligent self-diagnostic redundant pressure sensor includes a redundant sensitive core, a conversion circuit, a self-diagnostic signal processing circuit, and an electrical connector;
the redundant sensitive core body is provided with a pressure measuring cavity for accommodating pipeline media and is used for converting the pressure of the non-electric pipeline media into multi-path millivolt-level voltage signals;
the conversion circuit receives multiple paths of millivolt-level voltage signals, is used for converting the multiple paths of millivolt-level voltage signals into the same standard voltage signals, and leads out the converted standard voltage signals to the self-diagnosis signal processing circuit;
the self-diagnosis signal processing circuit performs multi-channel standard voltage signal cross comparison or converts the multi-channel standard voltage signals into corresponding pressure signals and then performs cross comparison, and if the difference value between the signals is smaller than a preset value, signals with normal operation of the average value of the multi-channel signals and the multi-channel signals are output; if the difference value between one or more signals and the other signals is larger than a preset value, eliminating abnormal signals, and outputting signals for keeping the average value of the signals and the actual working state of the multiple signals;
the self-diagnosis signal processing circuit leads out the processed final pressure signal and the actual working state signal of the multipath signals to the electric connector; the electric connector is connected with external equipment and is used for outputting final pressure signals and multipath signals to actually work state signals.
In a second aspect, a method of pressure monitoring includes the steps of:
the pressure sensor is connected into a pipeline or a container, and the redundant sensitive core of the sensor is used for converting the medium pressure of a non-electric pipeline into a multi-path millivolt-level voltage signal;
receiving multiple paths of millivolt-level voltage signals through a conversion circuit, converting the multiple paths of millivolt-level voltage signals into the same standard voltage signals, and leading out the converted standard voltage signals to a self-diagnosis signal processing circuit;
the method comprises the steps of performing multi-channel standard voltage signal cross comparison through a self-diagnosis signal processing circuit, or converting the multi-channel standard voltage signal into a corresponding pressure signal and then performing cross comparison, and outputting a multi-channel signal average value and a multi-channel signal normal working signal if the difference value between the signals is smaller than a preset value; if the difference value between one or more signals and the other signals is larger than a preset value, eliminating abnormal signals, and outputting signals for keeping the average value of the signals and the actual working state of the multiple signals;
the self-diagnosis signal processing circuit leads out the processed final pressure signal and the actual working state signal of the multipath signals to the electric connector; the electric connector is connected with external equipment and outputs final pressure signals and multipath signals to the actual working state signals.
According to the intelligent self-diagnosis redundant pressure sensor and the pressure monitoring method provided by the invention, the intelligent self-diagnosis redundant pressure sensor has the following beneficial effects:
(1) According to the invention, the conversion circuit conditions and amplifies the millivolt-level small signal output by the sensitive core body into the standard signal of 0-5V, and the multipath signals have good consistency, and the calibration curves are identical. The method is convenient for the subsequent diagnosis circuit to carry out parameter management, the calibration equation of the multipath signals is identical, the hardware and software design of the diagnosis circuit is simplified, the parameters can be cured in advance, and parameter input errors of each product are avoided.
(2) In the invention, the diagnosis circuit can judge whether the multi-channel redundant signals work normally, vote, judge and process the signals and then output the signals, so that the reliability of the output signals of the sensor is improved, and meanwhile, the working state of the output multi-channel signals is convenient for use and management of the sensor.
(3) The invention outputs multiple paths of millivolt voltage signals through the redundant sensitive core body, the voltage signals are converted into identical standard signals through the high-precision miniaturized conversion circuit, the output reliability judgment and the signal processing are carried out through the self-diagnosis signal processing circuit, and finally reliable signals and the working states of multiple paths of signals inside the sensor are output. The sensor has powerful function, compact structure, reliable operation and simple use and maintenance.
Drawings
FIG. 1 is a schematic diagram of an intelligent self-diagnostic redundant pressure sensor of the present invention;
FIG. 2 is a schematic diagram of the connection of the conversion circuit;
fig. 3 is a schematic diagram of connection of the self-diagnosis signal processing circuit.
Description of the reference numerals
1-a filler neck; a 2-conversion circuit; 3-a self-diagnostic signal processing circuit; 4-redundant sensitive cores; 5-an adapter plate; 6-a housing; 7-electrical connectors.
Detailed Description
The features and advantages of the present invention will become more apparent and clear from the following detailed description of the invention.
The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
According to a first aspect of the present invention, there is provided an intelligent self-diagnostic redundant pressure sensor, as shown in fig. 1, comprising a filler neck 1, a redundant sensitive core 4, an adapter plate 5, a conversion circuit 2, a self-diagnostic signal processing circuit 3, a housing 6 and an electrical connector 7;
the filler neck 1 is of a joint structure, a drainage channel communicated with the pressure measuring cavity of the redundant sensitive core body 4 is formed in the middle of the filler neck, the filler neck 1 is in butt joint with a threaded hole on a medium conveying pipeline, and a pipeline medium is introduced into the pressure measuring cavity of the redundant sensitive core body 4;
the redundant sensitive core 4 is welded and fixed on the filler neck 1 and is used for converting the pressure of a non-electric pipeline medium into a multi-path millivolt voltage signal; the number N of the multipath millivolt-level voltage signals is more than or equal to 2; the redundant sensitive core 4 can be provided with a plurality of groups of independent open measuring bridges, and the open measuring bridges are connected through leads to form a closed measuring bridge, and of course, the redundant sensitive core can also be in other forms to realize redundant measurement of pipeline medium pressure;
the signals of the redundant sensitive core 4 are led out to an adapter plate 5, and then a plurality of millivolt-level voltage signals are led out to the input end of the conversion circuit 2 through a welding wire of the adapter plate; of course, the multi-path millivolt voltage signal can be directly led out to the input end of the conversion circuit 2 without passing through the adapter plate 5, and the stability of the sensor structure can be improved due to the arrangement of the adapter plate 5;
the conversion circuit 2 is used for converting multiple millivolt-level voltage signals into the same standard voltage signals, and an output end lead of the conversion circuit 2 leads out the converted standard voltage signals to an input end of the self-diagnosis signal processing circuit 3;
the self-diagnosis signal processing circuit 3 performs multi-channel standard voltage signal cross comparison, or converts the multi-channel standard voltage signal into a corresponding pressure signal and then performs cross comparison, and if the difference value between the signals is smaller than a preset value, signals with normal operation of the average value of the multi-channel signals and the multi-channel signals are output; if the difference value between one or more signals and the other signals is larger than a preset value, eliminating abnormal signals, and outputting signals for keeping the average value of the signals and the actual working state of the multiple signals;
the output end lead of the self-diagnosis signal processing circuit 3 leads out the processed final pressure signal and the actual working state signal of the multipath signals to the electric connector 7; the electric connector 7 is connected with external equipment and is used for outputting a final pressure signal and a multipath signal actual working state signal; the outer shell 6 is welded on the upper part of the filler neck 1 for protecting the sensor internal structure.
In the present invention, as shown in fig. 2, the conversion circuit 2 includes: a resistive sensor signal conditioning transmitter, a transient voltage suppression diode, magnetic beads and a filtering resistance-capacitance; the sensor signal conditioning transmitter supplies power to the sensitive core, acquires differential millivolt voltage signals output by the sensitive core, amplifies and conditions the differential millivolt voltage signals, and finally converts millivolt signals into standard signals of 0V-5V and outputs the standard signals; the transient voltage suppression diode is used for preventing reverse connection, the magnetic beads are used for eliminating power frequency interference, and the filter resistor and capacitor are used for filtering.
In the present invention, as shown in fig. 3, the self-diagnosis signal processing circuit 3 includes an input protection circuit, a signal acquisition circuit, a signal conditioning circuit, a digital communication circuit, a parameter management circuit, and the like.
According to a second aspect of the present invention, there is also provided a pressure monitoring method comprising the steps of:
the pressure sensor is connected into a pipeline or a container, and the redundant sensitive core of the sensor is used for converting the medium pressure of a non-electric pipeline into a multi-path millivolt-level voltage signal;
receiving multiple paths of millivolt-level voltage signals through a conversion circuit, converting the multiple paths of millivolt-level voltage signals into the same standard voltage signals, and leading out the converted standard voltage signals to a self-diagnosis signal processing circuit;
the method comprises the steps of performing multi-channel standard voltage signal cross comparison through a self-diagnosis signal processing circuit, or converting the multi-channel standard voltage signal into a corresponding pressure signal and then performing cross comparison, and outputting a multi-channel signal average value and a multi-channel signal normal working signal if the difference value between the signals is smaller than a preset value; if the difference value between one or more signals and the other signals is larger than a preset value, eliminating abnormal signals, and outputting signals for keeping the average value of the signals and the actual working state of the multiple signals;
the self-diagnosis signal processing circuit leads out the processed final pressure signal and the actual working state signal of the multipath signals to the electric connector; the electric connector is connected with external equipment and outputs final pressure signals and multipath signals to the actual working state signals.
In the invention, the voting strategy of the self-diagnosis signal processing circuit is as follows, three-way redundancy signal voting is taken as an example for introduction, and the rest quantity is redundant and universal.
1) When the self-diagnosis signal processing circuit converts the multi-path standard voltage signal into the corresponding pressure signal and then carries out cross comparison, firstly, whether the three paths of pressure signals are reliable or not is judged, and when the pressure of a certain path can be determined to be short circuit and open circuit fault (P)>P Full scale range Mpa or P<0 Mpa), and the rest pressure signals are used as the basis for judging the system pressure. If all three paths fail, then directlyOutput 111 and give a beep alarm.
2) When the three paths of pressure signals are judged in the step 1), the absolute values after the three paths of pressure signals are subjected to cross comparison are used for judging, the three paths of pressure signals are assumed to be output as P1, P2 and P3 in sequence, and the following three formulas are respectively calculated:
judging whether a certain signal output is larger than a normal error range, wherein err th To allow for error threshold, err th =0.1 MPa. And respectively adopting the following methods for signal processing according to the judging result:
when abc=000, 001, 010, 100, the three-way pressure signal mean is used as the system pressure actual value.
When abc=011, 110, 101, it is indicated that there is a low confidence in the output of one signal, then the average of the two signals whose pressure outputs meet the error range requirement is used as the actual value of the system pressure.
When abc=111, the maximum pressure value is taken as the actual system pressure value.
3) When only two signals are available, the absolute value of the output difference value of the two pressure signals is used for judging that the absolute value of the output difference value of the two signals is smaller than err th When the pressure is=0.2 MPa, taking the average value of two paths of pressure signals as the actual value of the system pressure, wherein the absolute value of the output difference value of the two paths of signals is larger than err th And taking the maximum pressure value as the actual system pressure value.
4) When only one signal is available, the signal is used as the system pressure value.
The invention has been described in detail in connection with the specific embodiments and exemplary examples thereof, but such description is not to be construed as limiting the invention. It will be understood by those skilled in the art that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its embodiments without departing from the spirit and scope of the present invention, and these fall within the scope of the present invention. The scope of the invention is defined by the appended claims.
What is not described in detail in the present specification is a well known technology to those skilled in the art.
Claims (6)
1. The intelligent self-diagnosis redundant pressure sensor is characterized by comprising a redundant sensitive core body (4), a conversion circuit (2), a self-diagnosis signal processing circuit (3) and an electric connector (7);
the redundant sensitive core body (4) is provided with a pressure measuring cavity for accommodating pipeline media and is used for converting the pressure of the non-electric pipeline media into multi-path millivolt-level voltage signals;
the conversion circuit (2) receives multiple paths of millivolt-level voltage signals, is used for converting the multiple paths of millivolt-level voltage signals into the same standard voltage signals, and leads out the converted standard voltage signals to the self-diagnosis signal processing circuit (3);
the self-diagnosis signal processing circuit (3) performs multi-channel standard voltage signal cross comparison or converts the multi-channel standard voltage signals into corresponding pressure signals and then performs cross comparison, and if the difference value between the signals is smaller than a preset value, signals with normal operation of the average value of the multi-channel signals and the multi-channel signals are output; if the difference value between one or more signals and the other signals is larger than a preset value, eliminating abnormal signals, and outputting signals for keeping the average value of the signals and the actual working state of the multiple signals;
the self-diagnosis signal processing circuit (3) leads out the processed final pressure signal and the actual working state signal of the multipath signals to the electric connector (7); the electric connector (7) is connected with external equipment and is used for outputting a final pressure signal and a multipath signal actual working state signal.
2. The intelligent self-diagnosis redundant pressure sensor according to claim 1, further comprising a filler neck (1), wherein the redundant sensitive core body (4) is welded and fixed on the filler neck (1), the filler neck (1) is of a joint structure, a drainage channel communicated with a pressure measuring cavity of the redundant sensitive core body (4) is arranged in the middle, the filler neck (1) is in butt joint with a threaded hole on a medium conveying pipeline, and a pipeline medium is introduced into the pressure measuring cavity of the redundant sensitive core body (4).
3. The intelligent self-diagnostic redundant pressure sensor of claim 1 further comprising a housing (6), the housing (6) being welded to the upper portion of the filler neck (1) for protecting the sensor internal structure.
4. The intelligent self-diagnostic redundant pressure sensor of claim 1 wherein said conversion circuit comprises: a resistive sensor signal conditioning transmitter, a transient voltage suppression diode, magnetic beads and a filtering resistance-capacitance; the sensor signal conditioning transmitter supplies power to the sensitive core, acquires differential millivolt voltage signals output by the sensitive core, amplifies and conditions the differential millivolt voltage signals, and finally converts millivolt signals into standard signals of 0V-5V and outputs the standard signals; the transient voltage suppression diode is used for preventing reverse connection, the magnetic beads are used for eliminating power frequency interference, and the filter resistor and capacitor are used for filtering.
5. The intelligent self-diagnostic redundant pressure sensor of claim 1 wherein the number of paths N of the multi-path millivolt-level voltage signal is greater than or equal to 2.
6. A method of pressure monitoring comprising the steps of:
the pressure sensor is connected into a pipeline or a container, and the redundant sensitive core of the sensor is used for converting the medium pressure of a non-electric pipeline into a multi-path millivolt-level voltage signal;
receiving multiple paths of millivolt-level voltage signals through a conversion circuit, converting the multiple paths of millivolt-level voltage signals into the same standard voltage signals, and leading out the converted standard voltage signals to a self-diagnosis signal processing circuit;
the method comprises the steps of performing multi-channel standard voltage signal cross comparison through a self-diagnosis signal processing circuit, or converting the multi-channel standard voltage signal into a corresponding pressure signal and then performing cross comparison, and outputting a multi-channel signal average value and a multi-channel signal normal working signal if the difference value between the signals is smaller than a preset value; if the difference value between one or more signals and the other signals is larger than a preset value, eliminating abnormal signals, and outputting signals for keeping the average value of the signals and the actual working state of the multiple signals;
the self-diagnosis signal processing circuit leads out the processed final pressure signal and the actual working state signal of the multipath signals to the electric connector; the electric connector is connected with external equipment and outputs final pressure signals and multipath signals to the actual working state signals.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118190276A (en) * | 2024-05-17 | 2024-06-14 | 菏泽市产品检验检测研究院 | Pressure vessel fault diagnosis method based on machine learning |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118190276A (en) * | 2024-05-17 | 2024-06-14 | 菏泽市产品检验检测研究院 | Pressure vessel fault diagnosis method based on machine learning |
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