CN113588141A - Collecting and diagnosing working method of capacitive edge computing pressure transmitter - Google Patents
Collecting and diagnosing working method of capacitive edge computing pressure transmitter Download PDFInfo
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- CN113588141A CN113588141A CN202110906690.7A CN202110906690A CN113588141A CN 113588141 A CN113588141 A CN 113588141A CN 202110906690 A CN202110906690 A CN 202110906690A CN 113588141 A CN113588141 A CN 113588141A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/14—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators
- G01L1/142—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators using capacitors
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/64—Testing of capacitors
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Abstract
The invention provides a working method for collecting and diagnosing a capacitive edge computing pressure transmitter, which comprises the following steps: s1, acquiring peripheral pressure data through the pressure transmitter, collecting the pressure data through the edge calculation data acquisition module, and acquiring the pressure data through the first self-diagnosis module by the edge calculation data acquisition module; s2, the pressure data processed by the first self-diagnosis module is subjected to data conversion through the edge calculation data conversion module, and the output pressure data is subjected to diagnosis operation to obtain corresponding diagnosis data; s3, the pressure data after diagnosis is stored, processed abnormally, judged and outputted in the second self-diagnosis module. According to the invention, an edge calculation capacitance type pressure transmitter calculation model is constructed, a pressure transmitter edge data diagnosis and detection method based on noise analysis is judged, and abnormal failure fault detection of pressure data is realized by extracting the characteristic value of noise data and comparing the characteristic value with a cloud reference pressure characteristic value.
Description
The application is a divisional application with the title of 'capacitive edge computing pressure transmitter acquisition diagnostic circuit and working method thereof' of application number 2020106062806, 2020, 29/06/2020.
Technical Field
The invention relates to the technical field of industrial process control, in particular to a working method for collecting and diagnosing a capacitive edge computing pressure transmitter.
Background
The pressure transmitter is a pressure transmitter which takes output as a standard signal, and is an instrument which receives a pressure variable and converts the pressure variable into a standard output signal in proportion. It can convert the physical pressure parameters sensed by the load cell sensor into standard electric signals for the secondary instruments such as indicating alarm, recorder and regulator to measure, indicate and regulate the process. The pressure transmitter is the most common sensor in industrial practice, is widely applied to various industrial automatic control environments, and relates to various industries such as water conservancy and hydropower, railway traffic, intelligent buildings, production automatic control, aerospace, military industry, petrochemical industry, oil wells, electric power, ships, machine tools, pipelines and the like.
The problem that the single body of the existing pressure transmitter diagnosis equipment is difficult to support the edge intelligent function is solved from the aspect of function research, the problem that the intelligent equipment lacks remote management and operation and maintenance, how to construct the edge computing capability of the pressure transmitter diagnosis circuit is solved, and the problems of low management and control and intelligent degree of the traditional instrument body are solved; on the basis of limited resources and software and hardware carriers of the traditional instrument, three-level intelligent cooperation is constructed by expanding resources and software and hardware, and how to break through the self-diagnosis of the pressure transmitter body, the self-learning based on the trend change rate of the working condition and the edge calculation function such as self-decision based on the diagnosis and learning. There is a great need for those skilled in the art to solve the corresponding technical problems.
Disclosure of Invention
The invention aims to at least solve the technical problems in the prior art, and particularly provides a working method for collecting and diagnosing a capacitive edge computing pressure transmitter.
In order to achieve the above object, the present invention provides a working method for collecting and diagnosing a capacitive edge computing pressure transmitter, comprising the following steps:
s1, acquiring peripheral pressure data through the pressure transmitter, collecting the pressure data through the edge calculation data acquisition module, and acquiring the pressure data through the first self-diagnosis module by the edge calculation data acquisition module;
s2, the pressure data processed by the first self-diagnosis module is subjected to data conversion through the edge calculation data conversion module, and the output pressure data is subjected to diagnosis operation to obtain corresponding diagnosis data;
s3, the pressure data after diagnosis is stored, processed abnormally, judged and outputted in the second self-diagnosis module.
In a preferred embodiment of the present invention, the S1 includes:
s1-1, initializing the pressure transmitter, collecting pressure data of the pressure transmitter, emptying a corresponding storage address of a storage module according to an address required to be stored by the pressure data, and loading the collected pressure data into a pre-stored buffer area address;
s1-2, in the first self-diagnosis module, diagnosing the acquired pressure data, judging a detection function in the memory, performing CRC (cyclic redundancy check) on the stored data, and monitoring the data through the data processing unit after the CRC is completed;
s1-3, unpacking and analyzing through a communication protocol in the process of collecting pressure data, loading a physical state address into a Modbus register address through a mapping relation, setting an initial register address as a blank target area, setting the initial register address as a data receiving starting area, the second register address as a mark description area, the third register address as a decision area, the fifth register address as a characteristic area, the sixth register address as a capacitance state area, the seventh register address as a low-voltage warning area, the eighth register address as a standard state area, the ninth register address as a minimum pressure data value and the tenth register address as a maximum pressure data value;
s1-4, the data processing unit obtains pressure data and places the pressure data in a first register, a capacitance data value obtained through a first capacitor and a fifth capacitor is placed in a sixth register, the data of the sixth register is compared with the data of an eighth register, if the data of the sixth register is larger than or smaller than the data of the eighth register, the data of the eighth register is placed in a characteristic area, and if the data of the eighth register is in an interval, the data of the eighth register is placed in a third register;
s1-5, when the data processing unit judges that the pressure data is the minimum pressure data value, the minimum pressure data value is placed in a ninth register, when the pressure data is judged to be the maximum pressure data value, the maximum pressure data value is placed in a tenth register, and if a low-voltage state is detected, the low-voltage state data is placed in a seventh register;
and S1-6, in the process that the data processing unit prepares to call the corresponding data, the related data can be quickly positioned and further operated.
In a preferred embodiment of the present invention, S1 further includes: s1-7, after the pressure transmitter collects data, the pressure transmitter performs analog-to-digital conversion, performs nonlinear compensation and differential pressure calculation on the pressure data, diagnoses and monitors the pressure data through process variable calculation, monitors the process variable calculation of the pressure data, and performs data collection and learning on current and voltage when the pressure data are output through a self-learning function;
s1-8, in the pressure data diagnosis process, the process variable calculation is saved, after the self-learning time is over, the average value of the process variable is calculated, self-diagnosis parameters are generated, if the average value of the process variable exceeds the alarm set range, the alarm operation is carried out through the display unit, if the average value of the process variable is in the reminding threshold range, the pressure transmitter is adopted for carrying out the reminding operation, if the average value of the process variable is out of the alarm set range or out of the reminding threshold range, the relearning operation is carried out through the self-learning function, and the average value is adjusted in the relearning operation process, so that the average value meets the requirement of the pressure transmitter for collecting and diagnosing;
and S1-9, calculating the standard deviation of the process variable, exiting the diagnosis process when the standard deviation of the calculated process variable exceeds a set upper limit, exiting the diagnosis process when the standard deviation of the calculated process variable exceeds a set lower limit, and acquiring the diagnosis process in real time only when the standard deviation is between the set upper limit and the set lower limit and the normal standard deviation value in the process variable calculation is maintained.
In a preferred embodiment of the present invention, the S2 includes:
s2-1, the edge calculation data conversion module performs conversion operation on the pressure data, improves the precision of the pressure data acquired by the pressure transmitter, needs to determine the failure rate of the capacitance data,
acquiring a charging correction function of the capacitor in the charging process of the capacitor
Beta is a charge regulation coefficient;
when the capacitor discharges, the discharge correction function of the capacitor is obtained
CnIs a capacitance value, SemptyIn the discharge state, the capacitance deviation value is muThe coefficient of the adjustment is adjusted,
s2-2, obtaining a failure model of the pressure transmitter according to the correction function,
wherein E is a pressure data instantaneous response value, eta is a pressure data correction coefficient, F is a pressure data control deviation value, Z is a constraint value for acquiring pressure data receiving frequency, sigma is a constraint factor, and U is an external environment influence factor;
multiplying the set pressure signal transmission intensity d by the pressure signal receiving frequency k, performing matrix model calculation according to the target diagnosis quantity p,
wherein r is a signal attenuation value, m is an attenuation parameter, T is a pressure intensity ratio, six-level parameters are calculated in a matrix model, and parameters obtained under different environments of pressure data are subjected to failure calculation, so that parameter optimization and diagnosis are performed on a data structure,
and S2-3, after the parameters in the matrix model are calculated, predicting the failure rate of the data sent by the pressure transmitter and calculating the optimal value of the matrix model, and diagnosing and optimizing according to the transmitted pressure data.
In a preferred embodiment of the present invention, the S3 includes:
s3-1, retrieving a pressure data check coefficient q from a memory in a second self-diagnosis module according to the pressure data after diagnosis, setting a threshold value ζ in the t-1 th pressure data output value, setting a switching coefficient ∈ in a pressure data abnormality formula P (t) ∈j (t) + ζ j (t) + q [ j (t) -j (t-1) ] to 1, calculating a tth pressure data abnormality output value P (t), and calculating a difference Δ P ═ j (t-1) between the tth theoretical output value j (t) and the t-1 th theoretical output value j (t-1);
s3-2, safety measures are guaranteed for stored data through the SRS coding mode, data are prevented from being abnormally tampered, a data acquisition standard followed by pressure transmitter data calculation is diagnosed for an acquisition circuit, whether the data are intact is judged through CRC (cyclic redundancy check) and SRS (sounding reference signal) verification, a voltage detection circuit is adopted for voltage protection in the collection process, when under-voltage occurs, a safety failure mode is switched to, and when the voltage is normal, pressure data acquisition work is carried out.
The invention also discloses a diagnosis device for the acquisition and diagnosis working method of the capacitive edge computing pressure transmitter, and the acquisition and diagnosis working method of the capacitive edge computing pressure transmitter is realized by using the diagnosis device.
In a preferred embodiment of the invention, the diagnostic equipment comprises a base, wherein front end connecting bolts are connected in the middle of the front end and the rear end of the top of the base in a threaded manner, side end connecting bolts are connected in the middle of the two sides of the top of the base in a threaded manner, a protective body is fixedly connected in the middle of the top of the base, a mounting groove is formed in the top of the protective body, a pressure transmitter is fixedly mounted in the rear end of one side of the mounting groove, a capacitor module is fixedly mounted in the front end of one side of the mounting groove, an analog switch device is fixedly mounted in the middle of the mounting groove, a microcontroller is fixedly mounted in the front end of the other side of the mounting groove, an anode connecting groove is formed in the rear end of the other end of the mounting groove, a cathode connecting groove is formed in the front end of the anode connecting groove, a top cover is fixedly connected to the top of the base, a control display screen is fixedly mounted in the front end of one side of the top cover, and a clamping groove is formed in the bottom of the top cover, threaded holes are formed in the middle of the front side, the rear side, the left side and the right side of the bottom of the top cover, front-end connecting bolts and side-edge connecting bolts are respectively in threaded connection in the four threaded holes, an anode clamping groove is formed in the rear end of one side of the top cover, and a cathode clamping groove is formed in the front end of the anode clamping groove.
In a preferred embodiment of the present invention, the capacitor module includes a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor, the second capacitor is fixedly clamped at the rear end of the first capacitor, the third capacitor is fixedly clamped at the rear end of the second capacitor, the fourth capacitor is fixedly clamped at the rear end of the third capacitor, the fifth capacitor is fixedly clamped at the rear end of the fourth capacitor, and the pressure transmitter is fixedly clamped at the rear end of the fifth capacitor.
In a preferred embodiment of the present invention, a first sensor guiding column, a second sensor guiding column, and a third sensor guiding column are sequentially disposed at a front end of a top of the pressure transmitter.
In a preferred embodiment of the present invention, one end of the top of the analog switch device, which is close to the capacitor module, is sequentially provided with a pin a7, a6, a5, a4, a3, a2, a1, and a0, and the other end of the top of the analog switch device is sequentially provided with a pin s2, a pin s1, a pin s0, a pin E, a negative electrode pin, and a positive electrode pin.
In a preferred embodiment of the present invention, an s2 controller leading post, an s1 controller leading post, and an s0 controller leading post are sequentially disposed at one end of the top of the microcontroller near the analog switch device, and are in control connection with the leading posts, and a connection slot is disposed in the middle of the rear end of the top of the microcontroller.
In a preferred embodiment of the invention, the a0 pin is connected with a first sensor lead, the a1 pin is connected with a second sensor lead, and the a2 pin is connected with a third sensor lead.
In a preferred embodiment of the present invention, the lead of the a3 pin is connected to a fifth positive capacitor, the lead of the a4 pin is connected to a fourth positive capacitor, the lead of the a5 pin is connected to a third positive capacitor, the lead of the a6 pin is connected to a second positive capacitor, and the lead of the a7 pin is connected to a first positive capacitor.
In a preferred embodiment of the present invention, the E pin is connected to a control connection pin, the s0 pin is connected to an s0 controller pin, the s1 pin is connected to an s1 controller pin, and the s2 pin is connected to an s2 controller pin.
In a preferred embodiment of the present invention, the positive electrode pin is connected to a positive electrode of a power supply through a wire, and the negative electrode pin is connected to a negative electrode of the power supply through a wire.
In a preferred embodiment of the present invention, the positive connection groove corresponds to a positive electrode slot, and the negative connection groove corresponds to a negative electrode slot.
In a preferred embodiment of the present invention, the method further comprises: the first capacitance signal output end is connected with a first capacitance signal receiving end of the data processing unit, the second capacitance signal output end is connected with a second capacitance signal receiving end of the data processing unit, the third capacitance signal output end is connected with a third capacitance signal receiving end of the data processing unit, the fourth capacitance signal output end is connected with a fourth capacitance signal receiving end of the data processing unit, the fifth capacitance signal output end is connected with a fifth capacitance signal receiving end of the data processing unit, a pressure data signal end of the pressure transmitter is connected with a pressure signal end of the data processing unit, a display signal end of the data processing unit is connected with a signal receiving end of the display unit, a communication end of the data processing unit is connected with a data receiving end of the communication unit, and a data transmitting end of the communication unit is connected with the cloud server.
In summary, due to the adoption of the technical scheme, the invention comprises the following steps:
1. an edge calculation capacitance type pressure transmitter calculation model is built, a pressure transmitter edge data diagnosis and detection method based on noise analysis is judged, and abnormal failure fault detection of pressure data is realized by extracting a characteristic value of noise data and comparing the characteristic value with a cloud reference pressure characteristic value.
2. The capacitive type edge calculation pressure transmitter acquisition and diagnosis circuit is stable and reliable, mainly comprises devices such as standard capacitors and analog switch devices, is simple in circuit structure, low in hardware cost, high in reliability and easy to realize, utilizes five standard capacitors to acquire data, is higher in contrast, further improves the reliability and safety of a control system, and further ensures the working safety of the pressure transmitter.
3. The capacitive edge computing pressure transmitter acquisition diagnosis circuit has strong universality, and utilizes key technologies such as data sensing, feature extraction, mutual information conditioning, data fusion and the like to intelligently diagnose and cooperatively decide an edge intelligent core unit, thereby constructing self diagnosis, self learning and self decision.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic view of the structure of the cover body according to the present invention.
Fig. 3 is a schematic cross-sectional view of the cover according to the present invention.
FIG. 4 is a schematic view of the internal device structure of the present invention.
FIG. 5 is a schematic diagram of the pressure transmitter and capacitive module of the present invention.
Fig. 6 is a schematic structural diagram of an analog switching device according to the present invention.
FIG. 7 is a schematic diagram of a microcontroller according to the present invention.
FIG. 8 is a circuit diagram of the present invention.
FIG. 9 is a detailed circuit diagram of the present invention.
FIG. 10 is a flow chart of the present invention.
FIG. 11 is a flow chart of the diagnostic learning of the present invention.
In the figure: 1. a protective body; 2. a base; 3. the front end is connected with a bolt; 4. a capacitive module; 5. a pressure transmitter; 6. an analog switching device; 7. mounting grooves; 8. a positive connecting groove; 9. a negative connecting groove; 10. a microcontroller; 11. a side connecting bolt; 12. a top cover; 13. controlling the display screen; 14. a negative electrode clamping groove; 15. a positive electrode card slot; 16. a clamping groove; 17. a threaded hole; 401. a first capacitor; 402. a second capacitor; 403. a third capacitor; 404. a fourth capacitor; 405. a fifth capacitor; 501. a first lead post of the sensor; 502. a second lead post of the sensor; 503. a third lead post of the sensor; 601. a7 pin; 602. a6 pin; 603. a5 pin; 604. a4 pin; 605. a3 pin; 606. a2 pin; 607. a1 pin; 608. a0 pin; 609. a positive electrode pin; 610. a negative electrode pin; 611. e, a pin; 612. an s0 pin; 613. an s1 pin; 614. an s2 pin; 1001. s2 controller lead; 1002. s1 controller lead; 1003. s0 controller lead; 1004. the control connection is connected with the leading column; 1005. and is connected with the clamping groove.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
The invention provides a diagnostic device for collecting and diagnosing a working method of a capacitive edge computing pressure transmitter, which comprises a base 2, wherein front end connecting bolts 3 are connected with the middle threads of the front end and the rear end of the top of the base 2, side edge connecting bolts 11 are connected with the middle threads of the two sides of the top of the base 2, a protective body 1 is fixedly connected with the middle of the top of the base 2, a mounting groove 7 is arranged at the top of the protective body 1, a pressure transmitter 5 is fixedly arranged at the rear end of one side of the mounting groove 7, a capacitor module 4 is fixedly arranged at the front end of one side of the mounting groove 7, an analog switch device 6 is fixedly arranged in the middle of the mounting groove 7, a microcontroller 10 is fixedly arranged at the front end of the other side of the mounting groove 7, an anode connecting groove 8 is arranged at the rear end of the other end of the mounting groove 7, a cathode connecting groove 9 is arranged at the front end of the anode connecting groove 8, and a top cover 12 is fixedly connected with the top of the base 2, the front end of one side of the top cover 12 is fixedly provided with a control display screen 13, the bottom of the top cover 12 is provided with a clamping groove 16, the bottom of the top cover 12 is provided with a threaded hole 17 in the middle of four sides, namely front end connecting bolts 3 and side connecting bolts 11, which are respectively in threaded connection with the four threaded holes 17, the rear end of one side of the top cover 12 is provided with a positive clamping groove 15, and the front end of the positive clamping groove 15 is provided with a negative clamping groove 14. The positive connecting groove 8 corresponds to the positive clamping groove 15, and the negative connecting groove 9 corresponds to the negative clamping groove 14.
The capacitor module 4 comprises a first capacitor 401, a second capacitor 402, a third capacitor 403, a fourth capacitor 404 and a fifth capacitor 405, the second capacitor 402 is fixedly clamped at the rear end of the first capacitor 401, the third capacitor 403 is fixedly clamped at the rear end of the second capacitor 402, the fourth capacitor 404 is fixedly clamped at the rear end of the third capacitor 403, the fifth capacitor 405 is fixedly clamped at the rear end of the fourth capacitor 404, and the pressure transmitter 5 is fixedly clamped at the rear end of the fifth capacitor 405. The front end of the top of the pressure transmitter 5 is sequentially provided with a first sensor leading column 501, a second sensor leading column 502 and a third sensor leading column 503. An s2 controller leading column 1001, an s1 controller leading column 1002 and an s0 controller leading column 1003 are sequentially arranged at one end, close to the analog switch device 6, of the top of the microcontroller 10, a control connection leading column 1004 is arranged, and a connection clamping groove 1005 is formed in the middle of the rear end of the top of the microcontroller 10.
The analog switch device 6 is provided with a pin 601 a7 a6 a pin 602 a5 a pin 603 a4 a pin 604 a3 a pin 605 a2 a pin 606 a1 pin 607 a0 a pin 608, and is provided with a pin 614 s2, pin 613 s1, pin 612 s0, pin 611E, pin 610 of negative pole and pin 609 of positive pole at the other end of the top thereof. The pin 608 of the a0 is connected with the first lead column 501 of the sensor through a lead wire, the pin 607 of the a1 is connected with the second lead column 502 of the sensor through a lead wire, and the pin 606 of the a2 is connected with the third lead column 503 of the sensor through a lead wire. The lead of the pin 605 of a3 is connected with the anode of a fifth capacitor 405, the lead of the pin 604 of a4 is connected with the anode of a fourth capacitor 404, the lead of the pin 603 of a5 is connected with the anode of a third capacitor 403, the lead of the pin 602 of a6 is connected with the anode of a second capacitor 402, and the lead of the pin 601 of a7 is connected with the anode of a first capacitor 401. The E pin 611 is connected with a control connection lead post 1004 through a lead, the s0 pin 612 is connected with an s0 controller lead post 1003 through a lead, the s1 pin 613 is connected with an s1 controller lead post 1002 through a lead, and the s2 pin 614 is connected with an s2 controller lead post 1001 through a lead. The positive pin 609 is connected to the positive pole of the power supply through a wire, and the negative pin 610 is connected to the negative pole of the power supply through a wire.
When the capacitive type edge computing pressure transmitter acquisition diagnostic circuit is used, current enters the analog switch device 6 through the positive electrode pin 609, then sequentially passes through the a0 pin 608, the a1 pin 607, the a2 pin 606, the a3 pin 605, the a4 pin 604, the a5 pin 603, the a6 pin 602 and the a7 pin 601, the pressure transmitter 5 acquires data, then the fifth capacitor 405, the fourth capacitor 404, the third capacitor 403, the second capacitor 402 and the first capacitor 401 sequentially acquire data, the data are transmitted to the microcontroller 10 and displayed on the control display screen 13 to be compared with a theoretical value, finally the current is led out of the device through the negative electrode pin 610, and the pressure transmitter data acquisition is completed through five standard capacitors, so that the pressure data can be accurately acquired.
As shown in fig. 8 and 9, the diagnostic circuit of the present invention includes: the first capacitance signal output end is connected with a first capacitance signal receiving end of the data processing unit, the second capacitance signal output end is connected with a second capacitance signal receiving end of the data processing unit, the third capacitance signal output end is connected with a third capacitance signal receiving end of the data processing unit, the fourth capacitance signal output end is connected with a fourth capacitance signal receiving end of the data processing unit, the fifth capacitance signal output end is connected with a fifth capacitance signal receiving end of the data processing unit, the pressure data signal end of the pressure transmitter is connected with the pressure signal end of the data processing unit, the display signal end of the data processing unit is connected with the signal receiving end of the display unit, the communication end of the data processing unit is connected with the data receiving end of the communication unit, and the data transmitting end of the communication unit is connected with the cloud server,
each capacitor transmits a signal to the data processing unit through the analog switch controller, when the voltage of the capacitor is charged to be more than 2.2V through the input end of the voltage comparator, the level of the output end of the NAND gate jumps from high level to low level, the capacitor starts a discharging process, and when the voltage of the capacitor is reduced due to discharging and is less than 1.1V, the level of the output end of the NAND gate jumps from low level to high level, so that a capacitor charging and discharging cycle is completed. And sequentially 1-128 times of the charging and discharging time of the capacitor according to the level output width, so that different resolving powers are selected. The method comprises the steps that data of a pressure transmitter are obtained through an edge calculation data acquisition module, the data are sent to a data processing unit, namely a microcontroller, through a capacitance differential pressure acquisition mode, the edge calculation power supply module supplies power to the edge calculation data acquisition module and an edge calculation data conversion module respectively, and the edge calculation data acquisition module sends acquired data to a first self-diagnosis module for solving the problems of open-circuit diagnosis, short-circuit diagnosis, drift diagnosis, acquisition circuit diagnosis and pressure-leading pipeline diagnosis of signals obtained by the pressure transmitter; the pressure data is converted and output through the edge calculation data conversion module, and pressure data storage diagnosis, output parameter abnormity diagnosis, pressure calculation and numerical value conversion diagnosis are performed through the second self-diagnosis module; the processed pressure data is transmitted to a local server through an edge calculation data conversion module, the local server uploads the data to a cloud,
as shown in fig. 10 and 11, the edge computing power supply module supplies power to the instrument card through the shunt regulator, and for the communication card, that is, between the connection bus and the UART isolation circuit, the shunt regulator circuit is used between the buses to absorb the redundant output current of the current reduction modulation circuit in addition to the voltage stabilization function. The UART isolation circuit is used for removing the influence of voltage fluctuation of the secondary parallel voltage stabilizing circuit caused by the current change of the current modulation circuit through the series voltage stabilizer.
As shown in fig. 10, the working method of the capacitive edge computing pressure transmitter acquisition and diagnosis circuit of the present invention includes the following steps:
s1, acquiring peripheral pressure data through the pressure transmitter, collecting the pressure data through the edge calculation data acquisition module, and acquiring the pressure data through the first self-diagnosis module by the edge calculation data acquisition module;
s2, the pressure data processed by the first self-diagnosis module is subjected to data conversion through the edge calculation data conversion module, and the output pressure data is subjected to diagnosis operation to obtain corresponding diagnosis data;
s3, the pressure data after diagnosis is stored, processed abnormally, judged and outputted in the second self-diagnosis module.
The S1 includes:
s1-1, initializing the pressure transmitter, collecting pressure data of the pressure transmitter, emptying a corresponding storage address of a storage module according to an address required to be stored by the pressure data, and loading the collected pressure data into a pre-stored buffer area address;
s1-2, in the first self-diagnosis module, diagnosing the acquired pressure data, judging a detection function in the memory, performing CRC (cyclic redundancy check) on the stored data, and monitoring the data through the data processing unit after the CRC is completed;
s1-3, unpacking and analyzing through a communication protocol in the process of collecting pressure data, loading a physical state address into a Modbus register address through a mapping relation, setting an initial register address as a blank target area, setting the initial register address as a data receiving starting area, the second register address as a mark description area, the third register address as a decision area, the fifth register address as a characteristic area, the sixth register address as a capacitance state area, the seventh register address as a low-voltage warning area, the eighth register address as a standard state area, the ninth register address as a minimum pressure data value and the tenth register address as a maximum pressure data value;
s1-4, the data processing unit obtains pressure data and places the pressure data in a first register, a capacitance data value obtained through a first capacitor and a fifth capacitor is placed in a sixth register, the data of the sixth register is compared with the data of an eighth register, if the data of the sixth register is larger than or smaller than the data of the eighth register, the data of the eighth register is placed in a characteristic area, and if the data of the eighth register is in an interval, the data of the eighth register is placed in a third register;
s1-5, when the data processing unit judges that the pressure data is the minimum pressure data value, the minimum pressure data value is placed in a ninth register, when the pressure data is judged to be the maximum pressure data value, the maximum pressure data value is placed in a tenth register, and if the low voltage state is detected, the low voltage state data is placed in a seventh register;
s1-6, in the process that the data processing unit is ready to call the corresponding data, the related data can be quickly positioned and further operated;
s1-7, after the pressure transmitter collects the data, after the analog-to-digital conversion, the nonlinear compensation and differential pressure calculation of the pressure data are carried out, the pressure data are diagnosed and monitored through the process variable calculation, the process variable calculation of the pressure data is monitored, and the current and voltage when the pressure data are output are collected and learned through the self-learning function,
s1-8, in the pressure data diagnosis process, the process variable calculation is saved, after the self-learning time is over, the average value of the process variable is calculated, self-diagnosis parameters are generated, if the average value of the process variable exceeds the alarm set range, the alarm operation is carried out through the display unit, if the average value of the process variable is in the reminding threshold range, the pressure transmitter is adopted for carrying out the reminding operation, if the average value of the process variable is out of the alarm set range or out of the reminding threshold range, the relearning operation is carried out through the self-learning function, and the average value is adjusted in the relearning operation process, so that the average value meets the requirement of the pressure transmitter for collecting and diagnosing;
s1-9, calculating the standard deviation of the process variable, when the standard deviation of the calculated process variable exceeds the set upper limit, quitting the diagnosis process, when the standard deviation of the calculated process variable exceeds the set lower limit, quitting the diagnosis process, only if the standard deviation is between the set upper limit and the set lower limit, keeping the normal standard deviation value in the process variable calculation, then being in the real-time collection diagnosis process,
the S2 includes:
s2-1, the edge calculation data conversion module performs conversion operation on the pressure data, improves the precision of the pressure data acquired by the pressure transmitter, needs to determine the failure rate of the capacitance data,
acquiring a charging correction function of the capacitor in the charging process of the capacitor
Beta is a charge regulation coefficient, and beta is a charge regulation coefficient,
when the capacitor discharges, the discharge correction function of the capacitor is obtained
CnIs a capacitance value, SemptyThe capacitance deviation value in the discharge state, mu is the discharge regulation coefficient, lambdatTo modify the parameter in capacitance per unit time, SfullA capacitance deviation value in a charging state;
s2-2, obtaining a failure model of the pressure transmitter according to the correction function,
wherein E is a pressure data instantaneous response value, eta is a pressure data correction coefficient, F is a pressure data control deviation value, Z is a constraint value for acquiring pressure data receiving frequency, sigma is a constraint factor, and U is an external environment influence factor;
multiplying the set pressure signal transmission intensity d by the pressure signal receiving frequency k, performing matrix model calculation according to the target diagnosis quantity p,
wherein r is a signal attenuation value, m is an attenuation parameter, T is a pressure intensity ratio, six-level parameters are calculated in a matrix model, and parameters obtained under different environments of pressure data are subjected to failure calculation, so that parameter optimization and diagnosis are performed on a data structure,
s2-3, after calculating the parameters in the matrix model, predicting the failure rate of the data sent by the pressure transmitter and calculating the optimal value of the matrix model, diagnosing and optimizing according to the transmitted pressure data,
the S3 includes:
s3-1, retrieving a pressure data check coefficient q from a memory in a second self-diagnosis module according to the pressure data after diagnosis, setting a threshold value ζ in the t-1 th pressure data output value, setting a switching coefficient ∈ in a pressure data abnormality formula P (t) ∈j (t) + ζ j (t) + q [ j (t) -j (t-1) ] to 1, calculating a tth pressure data abnormality output value P (t), and calculating a difference Δ P ═ j (t-1) between the tth theoretical output value j (t) and the t-1 th theoretical output value j (t-1);
s3-2, using SRS coding mode to ensure the safety measure of the stored data, preventing the data from being distorted abnormally, diagnosing the collecting circuit, completing the data obtaining standard followed by the pressure transmitter data calculation, using CRC check and SRS check to judge whether the data is intact, using the voltage detecting circuit to protect the voltage during the collecting process, when the undervoltage occurs, switching to the safety failure mode, when the voltage is normal, collecting the pressure data,
by counting the influence of the failure rate, the failure model and the matrix model of each capacitor device, the optimal judgment factor is diagnosed, and the accuracy of pressure transmitter diagnosis is improved.
The method realizes the functions of self-learning, self-diagnosis and self-decision, and can continuously adjust the detection process in the process of acquiring the diagnostic data of the edge calculation pressure transmitter, thereby achieving the condition that the edge flow instrument continuously adapts and changes the monitoring value according to the environmental condition.
A capacitive pressure transmitter calculation model is built, a pressure transmitter edge data diagnosis and detection method based on noise analysis is judged, and abnormal failure fault detection of pressure data is realized by extracting a characteristic value of noise data and comparing the characteristic value with a cloud reference pressure characteristic value.
As shown in fig. 11, the fault detection of the pressure guiding tube is also the most important function of the collecting and diagnosing circuit in the internal diagnosing process, the health state of the pressure guiding tube is monitored in real time, the state of the pressure guiding tube is evaluated, the diagnosing function and the collecting function of the pressure transmitter, the data kitchen element are diagnosed, the pressure data collecting board and the communication board are diagnosed, and the communication data are verified.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (6)
1. A working method for collecting and diagnosing a capacitive edge computing pressure transmitter is characterized by comprising the following steps:
s1, acquiring peripheral pressure data through the pressure transmitter, collecting the pressure data through the edge calculation data acquisition module, and acquiring the pressure data through the first self-diagnosis module by the edge calculation data acquisition module;
s2, the pressure data processed by the first self-diagnosis module is subjected to data conversion through the edge calculation data conversion module, and the output pressure data is subjected to diagnosis operation to obtain corresponding diagnosis data;
s3, the pressure data after diagnosis is stored, processed abnormally, judged and outputted in the second self-diagnosis module.
2. The capacitive edge computing pressure transmitter acquisition diagnostic method of claim 2, wherein said S1 comprises:
s1-1, initializing the pressure transmitter, collecting pressure data of the pressure transmitter, emptying a corresponding storage address of a storage module according to an address required to be stored by the pressure data, and loading the collected pressure data into a pre-stored buffer area address;
s1-2, in the first self-diagnosis module, diagnosing the acquired pressure data, judging a detection function in the memory, performing CRC (cyclic redundancy check) on the stored data, and monitoring the data through the data processing unit after the CRC is completed;
s1-3, unpacking and analyzing through a communication protocol in the process of collecting pressure data, loading a physical state address into a Modbus register address through a mapping relation, setting an initial register address as a blank target area, setting the initial register address as a data receiving starting area, the second register address as a mark description area, the third register address as a decision area, the fifth register address as a characteristic area, the sixth register address as a capacitance state area, the seventh register address as a low-voltage warning area, the eighth register address as a standard state area, the ninth register address as a minimum pressure data value and the tenth register address as a maximum pressure data value;
s1-4, the data processing unit obtains pressure data and places the pressure data in a first register, a capacitance data value obtained through a first capacitor and a fifth capacitor is placed in a sixth register, the data of the sixth register is compared with the data of an eighth register, if the data of the sixth register is larger than or smaller than the data of the eighth register, the data of the eighth register is placed in a characteristic area, and if the data of the eighth register is in an interval, the data of the eighth register is placed in a third register;
s1-5, when the data processing unit judges that the pressure data is the minimum pressure data value, the minimum pressure data value is placed in a ninth register, when the pressure data is judged to be the maximum pressure data value, the maximum pressure data value is placed in a tenth register, and if a low-voltage state is detected, the low-voltage state data is placed in a seventh register;
and S1-6, in the process that the data processing unit prepares to call the corresponding data, the related data can be quickly positioned and further operated.
3. The capacitive edge computing pressure transmitter acquisition diagnostic method of claim 2, further comprising in said S1: s1-7, after the pressure transmitter collects data, the pressure transmitter performs analog-to-digital conversion, performs nonlinear compensation and differential pressure calculation on the pressure data, diagnoses and monitors the pressure data through process variable calculation, monitors the process variable calculation of the pressure data, and performs data collection and learning on current and voltage when the pressure data are output through a self-learning function;
s1-8, in the pressure data diagnosis process, the process variable calculation is saved, after the self-learning time is over, the average value of the process variable is calculated, self-diagnosis parameters are generated, if the average value of the process variable exceeds the alarm set range, the alarm operation is carried out through the display unit, if the average value of the process variable is in the reminding threshold range, the pressure transmitter is adopted for carrying out the reminding operation, if the average value of the process variable is out of the alarm set range or out of the reminding threshold range, the relearning operation is carried out through the self-learning function, and the average value is adjusted in the relearning operation process, so that the average value meets the requirement of the pressure transmitter for collecting and diagnosing;
and S1-9, calculating the standard deviation of the process variable, exiting the diagnosis process when the standard deviation of the calculated process variable exceeds a set upper limit, exiting the diagnosis process when the standard deviation of the calculated process variable exceeds a set lower limit, and acquiring the diagnosis process in real time only when the standard deviation is between the set upper limit and the set lower limit and the normal standard deviation value in the process variable calculation is maintained.
4. The capacitive edge computing pressure transmitter acquisition diagnostic method of claim 2, wherein said S2 comprises:
s2-1, the edge calculation data conversion module performs conversion operation on the pressure data, improves the precision of the pressure data acquired by the pressure transmitter, needs to determine the failure rate of the capacitance data,
acquiring a charging correction function of the capacitor in the charging process of the capacitor
Beta is a charge regulation coefficient;
when the capacitor discharges, the discharge correction function of the capacitor is obtained
CnIs a capacitance value, SemptyThe capacitance deviation value in the discharge state, mu is the discharge regulation coefficient,
s2-2, obtaining a failure model of the pressure transmitter according to the correction function,
wherein E is a pressure data instantaneous response value, eta is a pressure data correction coefficient, F is a pressure data control deviation value, Z is a constraint value for acquiring pressure data receiving frequency, sigma is a constraint factor, and U is an external environment influence factor;
multiplying the set pressure signal transmission intensity d by the pressure signal receiving frequency k, performing matrix model calculation according to the target diagnosis quantity p,
wherein r is a signal attenuation value, m is an attenuation parameter, T is a pressure intensity ratio, six-level parameters are calculated in a matrix model, and parameters obtained under different environments of pressure data are subjected to failure calculation, so that parameter optimization and diagnosis are performed on a data structure,
and S2-3, after the parameters in the matrix model are calculated, predicting the failure rate of the data sent by the pressure transmitter and calculating the optimal value of the matrix model, and diagnosing and optimizing according to the transmitted pressure data.
5. The capacitive edge computing pressure transmitter acquisition diagnostic method of claim 2, wherein said S3 comprises:
s3-1, retrieving a pressure data check coefficient q from a memory in a second self-diagnosis module according to the pressure data after diagnosis, setting a threshold value ζ in the t-1 th pressure data output value, setting a switching coefficient ∈ in a pressure data abnormality formula P (t) ∈j (t) + ζ j (t) + q [ j (t) -j (t-1) ] to 1, calculating a tth pressure data abnormality output value P (t), and calculating a difference Δ P ═ j (t-1) between the tth theoretical output value j (t) and the t-1 th theoretical output value j (t-1);
s3-2, safety measures are guaranteed for stored data through the SRS coding mode, data are prevented from being abnormally tampered, a data acquisition standard followed by pressure transmitter data calculation is diagnosed for an acquisition circuit, whether the data are intact is judged through CRC (cyclic redundancy check) and SRS (sounding reference signal) verification, a voltage detection circuit is adopted for voltage protection in the collection process, when under-voltage occurs, a safety failure mode is switched to, and when the voltage is normal, pressure data acquisition work is carried out.
6. The diagnostic device for collecting and diagnosing the working method of the capacitive edge computing pressure transmitter according to any one of claims 1 to 5, wherein the working method of collecting and diagnosing the working method of the capacitive edge computing pressure transmitter is implemented by using the diagnostic device.
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