CN108844570B - Temperature and humidity sensor abnormity detection method - Google Patents

Temperature and humidity sensor abnormity detection method Download PDF

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CN108844570B
CN108844570B CN201810747531.5A CN201810747531A CN108844570B CN 108844570 B CN108844570 B CN 108844570B CN 201810747531 A CN201810747531 A CN 201810747531A CN 108844570 B CN108844570 B CN 108844570B
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temperature
humidity
measurement
sensor
measurement value
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CN108844570A (en
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王扬清
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Xiamen Nengkong Automation Technology Co ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D18/00Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00

Abstract

The invention provides a temperature and humidity sensor abnormity detection method, which is used for detecting whether the temperature and the humidity measured by a control instrument are abnormal or not, wherein the control instrument at least comprises a measuring sensor and a control system, the measuring sensor is used for measuring the temperature and the humidity, and the method roughly comprises the following steps: reading a temperature and humidity measurement value of a measurement sensor and a preset CRC (cyclic redundancy check) code for the first time; comparing whether the CRC code of the temperature and humidity measurement value read for the first time is correct or not; judging whether the frequency of continuous errors of the CRC exceeds a first frequency threshold value or not; reading the temperature and humidity measurement value of the measurement sensor and the preset CRC code for the second time; comparing whether the CRC of the temperature and humidity measurement value read for the second time is correct or not; comparing whether the difference between the temperature and humidity measurement values read in two adjacent times exceeds a set over-limit value or not; and judging whether the frequency of the difference between the temperature and humidity measurement values read in two adjacent times continuously exceeding the set threshold value exceeds a second frequency threshold value.

Description

Temperature and humidity sensor abnormity detection method
Technical Field
The invention relates to the technical field of detection methods, in particular to a temperature and humidity sensor abnormality detection method.
Background
In a temperature and humidity control instrument, a temperature and humidity measuring sensor is a core component of the instrument, if the measuring sensor is wrong, the control function of the instrument is affected, and the temperature and the humidity are not controlled, so that extreme temperature or extreme humidity can be generated, and disastrous results can be caused. The temperature and humidity sensor and the instrument control system are separately installed, and are connected by a data line in a remote communication mode, and a communication interface is easily subjected to various electromagnetic interferences in the environment, so that the temperature value and the humidity value read from the sensor are wrong.
Moreover, most measurement sensors attach a CRC (cyclic redundancy check) code to measured data in the transmission process, and if the sensors cause measurement data errors due to some reason, the comparison between the measurement data and the CRC code is wrong; because the ambient temperature or humidity will not change greatly in a short time (e.g. within 1 second), if the sensor causes a large difference between the two measurements, the measured data may be erroneous; furthermore, if the measurement data is incorrect or the communication interface is subjected to various electromagnetic interferences, resetting the initialized sensor may cause the sensor which is normally operated to be in discontinuous operation, thereby causing measurement discontinuity or inaccuracy.
In view of the above, the present inventors have specially designed a method for detecting an abnormality of a temperature/humidity sensor, and have come up with this.
Disclosure of Invention
In order to solve the problems, the technical scheme of the invention is as follows:
a temperature and humidity sensor abnormity detection method is used for detecting whether temperature and humidity measured by a control instrument are abnormal or not, the control instrument at least comprises a measurement sensor and a control system, the measurement sensor is used for measuring temperature and humidity, and the method comprises the following steps:
firstly, reading a temperature and humidity measurement value of a measurement sensor and a preset CRC (cyclic redundancy check) code for the first time;
step two, comparing whether the CRC code of the temperature and humidity measurement value read for the first time is correct or not;
step three, in the step two, if the CRC code is wrong, whether the continuous wrong times of the CRC code exceed a first time threshold value is judged, if not, the step one is executed again, and if yes, the communication interface is possibly interfered or the measuring sensor is abnormal;
if the temperature and humidity measurement value of the measurement sensor and the preset CRC code are correct, reading the temperature and humidity measurement value of the measurement sensor and the preset CRC code for the second time;
step five, comparing whether the CRC of the temperature and humidity measurement value read for the second time is correct or not;
step six, if the step five is wrong, the step one is executed again;
step seven, if the temperature and humidity measurement values obtained in the step five are correct, comparing whether the difference between the temperature and humidity measurement values read in the two adjacent times exceeds a set threshold value or not;
step eight, if the step seven is yes, the measuring sensor is possibly abnormal,
and step nine, judging whether the frequency of continuously exceeding the set threshold value by the difference between the temperature and humidity measurement values read in two adjacent times exceeds a second frequency threshold value, if not, executing the step one again, and if so, indicating that the measurement sensor is abnormal.
Further, the measuring sensor comprises a temperature sensor and a humidity sensor, which are respectively used for measuring temperature and humidity, wherein the temperature and humidity measurement value comprises a temperature measurement value and a humidity measurement value.
Further, in the first step, the temperature measurement value and the humidity measurement value measured by the measurement sensor are read for the first time, and the corresponding preset CRC codes are read at the same time; and step two, calculating CRC (cyclic redundancy check) codes corresponding to the temperature measurement value and the humidity measurement value which are read for the first time, and comparing the CRC codes with the preset CRC codes corresponding to the temperature measurement value and the humidity measurement value respectively to determine whether the CRC codes are correct or not.
Further, in the third step, if any one or both of the comparison errors occur, counting one measurement exception, counting the number of times of continuous measurement exception occurring before the step is executed, wherein the counting of the number of times of measurement exception is restarted every time one comparison error occurs; and judging whether the continuous abnormal measurement times exceed a first time threshold, if the continuous abnormal measurement times do not exceed the first time threshold, re-executing the step one, and if the continuous abnormal measurement times exceed the first time threshold, indicating that the communication interface is possibly interfered or the measurement sensor is abnormal.
Further, in the fourth step, the temperature measurement value and the humidity measurement value measured by the measurement sensor are read for the second time, and the corresponding preset CRC check codes are read at the same time; step five, calculating CRC check codes corresponding to the temperature measurement value and the humidity measurement value read for the second time respectively, and comparing the CRC check codes with preset CRC check codes corresponding to the temperature measurement value and the humidity measurement value respectively to determine whether the CRC check codes are correct or not; and step six, if any one or both of the comparison errors occur, re-executing the step one, and simultaneously counting one measurement abnormality.
Further, in the seventh step, whether the difference between the temperature measurement values read in the first step and the humidity measurement values read in the fourth step twice exceeds the respective set threshold value is compared.
Further, in the step eight, if either one or both of the difference between the temperature measurement value and the humidity measurement value exceeds the over-limit value, the measurement sensor may be abnormal, the measured value is not usable, and a single possible abnormality is counted.
Further, in the ninth step, the number of times of possible abnormality continuously occurring in the eighth step is counted, wherein the counting of the number of times of possible abnormality is restarted every time the difference between the temperature measurement value and the humidity measurement value does not exceed the threshold value; and judging whether the continuous possible abnormal times exceed a second time threshold, if the continuous possible abnormal times do not exceed the second time threshold, re-executing the step one, and if the continuous possible abnormal times exceed the second time threshold, indicating that the measuring sensor is abnormal.
And step seven, if the difference between the temperature measurement value and the humidity measurement value does not exceed the threshold value, the control instrument can quote the temperature measurement value and the temperature measurement value to finish one measurement.
Further, in the third step, if the communication interface may be interfered or the measurement sensor is abnormal, the measurement sensor needs to be reset again to perform error correction processing, and meanwhile, the control instrument reports error processing, and the first step is executed again; step eight, if possible abnormality occurs and the continuous possible abnormal times do not exceed a second time threshold value, the measuring sensor does not perform any treatment; and step nine, if the measuring sensor is abnormal, resetting the measuring sensor and executing the step one again.
Further, the first time threshold value is six times.
Further, the second secondary threshold is five times.
The method can obviously improve the reliability of the temperature and humidity control instrument, can detect the abnormality in time when the measuring sensor is abnormal, can carry out different error correction processing aiming at different abnormalities, prevents the measuring sensor from generating data confusion due to the interference of some abnormalities, and stops the instrument from quoting the wrong measuring value of the sensor, so that extreme temperature or extreme humidity cannot be generated, and disastrous results cannot be caused.
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The invention will be further described with reference to the following examples with reference to the accompanying drawings.
FIG. 1 is a schematic flow chart of the anomaly detection method of the present invention.
Detailed Description
Referring to fig. 1, a method for detecting an abnormality of a temperature and humidity sensor as a preferred embodiment of the present invention is to detect whether a temperature and a humidity measured by a control instrument are abnormal, where the control instrument at least includes a measurement sensor and a control system, the measurement sensor is used for measuring the temperature and the humidity, the measurement sensor includes a temperature sensor and a humidity sensor respectively used for measuring the temperature and the humidity, and a temperature measurement value and a humidity measurement value are included in a temperature measurement value and a humidity measurement value.
The method comprises the following steps:
firstly, reading a temperature and humidity measurement value of a measurement sensor and a preset CRC (cyclic redundancy check) code for the first time; reading a temperature measurement value and a humidity measurement value obtained by the measurement sensor for the first time and simultaneously reading the corresponding preset CRC codes;
step two, comparing whether the CRC code of the temperature and humidity measurement value read for the first time is correct or not; before comparison, calculating CRC check codes corresponding to the temperature measurement value and the humidity measurement value which are read for the first time according to a CRC principle, and comparing the CRC check codes with preset CRC check codes corresponding to the temperature measurement value and the humidity measurement value respectively to determine whether the CRC check codes are correct or not;
step three, in the step two, if the CRC code is wrong, whether the continuous wrong times of the CRC code exceed a first time threshold value is judged, if not, the step one is executed again, and if yes, the communication interface is possibly interfered or the measuring sensor is abnormal; if any one of the comparison errors or both comparison errors occur, counting one-time measurement abnormality, and counting the continuous measurement abnormality times before the step is executed, wherein the counting of the measurement abnormality times is restarted every time the comparison is correct; judging whether the continuous abnormal measurement times exceed a first time threshold, if the continuous abnormal measurement times do not exceed the first time threshold, re-executing the first step, and if the continuous abnormal measurement times exceed the first time threshold, indicating that the communication interface is possibly interfered or the measurement sensor is abnormal; if the communication interface is possibly interfered or the measuring sensor is abnormal, resetting the measuring sensor again for error correction, simultaneously controlling the instrument to report errors, and executing the step one again;
if the temperature and humidity measurement value of the measurement sensor and the preset CRC code are correct, reading the temperature and humidity measurement value of the measurement sensor and the preset CRC code for the second time; reading a temperature measurement value and a humidity measurement value obtained by the measurement sensor for the second time and simultaneously reading the corresponding preset CRC codes;
step five, comparing whether the CRC of the temperature and humidity measurement value read for the second time is correct or not; before comparison, calculating CRC check codes corresponding to the temperature measurement value and the humidity measurement value respectively for the second time through a CRC principle, and comparing the CRC check codes with preset CRC check codes corresponding to the temperature measurement value and the humidity measurement value respectively for correctness or not;
step six, if the step five is wrong, the step one is executed again; if any one or both of the comparison errors occur, the step one is executed again, and one measurement abnormality is counted;
step seven, if the temperature and humidity measurement values obtained in the step five are correct, comparing whether the difference between the temperature and humidity measurement values read in the two adjacent times exceeds a set threshold value or not; comparing whether the difference between the temperature measurement values read twice in the first step and the fourth step and the difference between the humidity measurement values exceed the preset threshold value or not;
step eight, if the step seven is yes, measuring that the sensor is possibly abnormal; that is, if either one or both of the difference between the temperature measurement value and the humidity measurement value exceeds the over-limit value, the measurement sensor may be abnormal, the measured value is unavailable, and the possible abnormality is counted once; if possible abnormality occurs and the continuous possible abnormal times do not exceed the second time threshold value, the measuring sensor does not carry out any treatment, so that the discontinuous work or inaccurate measurement of the originally normally operated measuring sensor can be avoided;
step nine, judging whether the times that the difference between the temperature and humidity measurement values read in two adjacent times continuously exceeds a set threshold value exceeds a second time threshold value, if not, executing the step one again, and if so, indicating that the measurement sensor is abnormal; counting the number of possible abnormal times continuously occurring in the step eight, wherein the counting of the number of possible abnormal times is restarted when the difference between the temperature measured value and the humidity measured value does not exceed the threshold value every time the difference between the temperature measured value and the humidity measured value occurs; judging whether the continuous possible abnormal times exceed a second time threshold, if the continuous possible abnormal times do not exceed the second time threshold, re-executing the step one, and if the continuous possible abnormal times exceed the second time threshold, indicating that the measuring sensor is abnormal; if the measuring sensor is abnormal, only the measuring sensor needs to be reset at the moment, and the step one is executed again;
step ten, in the step seven, if both the difference between the temperature measurement value and the difference between the humidity measurement value do not exceed the threshold, the control instrument can refer to the temperature measurement value and the temperature measurement value, end the measurement, and simultaneously continue to execute the step one.
Preferably, the measurement sensor mentioned in the present invention may be: SHT 30; the first time threshold value is six times; the second counting threshold is five times; and resetting the measurement sensor includes resetting the temperature sensor and the humidity sensor simultaneously.
In summary, the reliability of the temperature and humidity control instrument can be obviously improved by the method, when the measuring sensor is abnormal, the abnormality can be detected in time, different error correction processing can be performed according to different abnormalities, the phenomenon that the measuring sensor generates data confusion due to interference of some abnormalities is prevented, the wrong measurement value of the instrument reference sensor is avoided, so that extreme temperature or extreme humidity cannot be generated, disastrous results cannot be caused, various environmental interferences can be effectively resisted, and processing can be performed.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.

Claims (10)

1. A temperature and humidity sensor abnormity detection method is characterized in that whether the temperature and the humidity measured by a control instrument are abnormal or not is detected, the control instrument at least comprises a measuring sensor and a control system, the measuring sensor is used for measuring the temperature and the humidity, and the method comprises the following steps:
firstly, reading a temperature and humidity measurement value of a measurement sensor and a preset CRC (cyclic redundancy check) code for the first time;
step two, comparing whether the CRC code of the temperature and humidity measurement value read for the first time is correct or not;
step three, in the step two, if the CRC code is wrong, whether the continuous wrong times of the CRC code exceed a first time threshold value is judged, if not, the step one is executed again, and if yes, the communication interface is possibly interfered or the measuring sensor is abnormal;
if the temperature and humidity measurement value of the measurement sensor and the preset CRC code are correct, reading the temperature and humidity measurement value of the measurement sensor and the preset CRC code for the second time;
step five, comparing whether the CRC of the temperature and humidity measurement value read for the second time is correct or not;
step six, if the step five is wrong, the step one is executed again;
step seven, if the temperature and humidity measurement values obtained in the step five are correct, comparing whether the difference between the temperature and humidity measurement values read in the two adjacent times exceeds a set threshold value or not;
step eight, if the step seven is yes, the measuring sensor is possibly abnormal,
and step nine, judging whether the frequency of continuously exceeding the set threshold value by the difference between the temperature and humidity measurement values read in two adjacent times exceeds a second frequency threshold value, if not, executing the step one again, and if so, indicating that the measurement sensor is abnormal.
2. The method according to claim 1, wherein the measurement sensor comprises a temperature sensor and a humidity sensor for measuring temperature and humidity, respectively, wherein the temperature and humidity measurement values comprise a temperature measurement value and a humidity measurement value.
3. The method for detecting the abnormality of the temperature and humidity sensor according to claim 2, wherein in the first step, the temperature measurement value and the humidity measurement value measured by the measurement sensor are read for the first time, and the corresponding preset CRC codes are read simultaneously; and step two, calculating CRC (cyclic redundancy check) codes corresponding to the temperature measurement value and the humidity measurement value which are read for the first time, and comparing the CRC codes with the preset CRC codes corresponding to the temperature measurement value and the humidity measurement value respectively to determine whether the CRC codes are correct or not.
4. The method according to claim 3, wherein in the third step, if any one or both of the comparison errors occur, counting one measurement abnormality, and counting the number of continuous measurement abnormalities occurring before the step is executed, wherein the counting of the number of measurement abnormalities is restarted every time one comparison is correct; and judging whether the continuous abnormal measurement times exceed a first time threshold, if the continuous abnormal measurement times do not exceed the first time threshold, re-executing the step one, and if the continuous abnormal measurement times exceed the first time threshold, indicating that the communication interface is possibly interfered or the measurement sensor is abnormal.
5. The method according to claim 2, wherein in the fourth step, the temperature measurement value and the humidity measurement value measured by the measurement sensor are read for the second time, and the corresponding preset CRC codes are read simultaneously; step five, calculating CRC check codes corresponding to the temperature measurement value and the humidity measurement value read for the second time respectively, and comparing the CRC check codes with preset CRC check codes corresponding to the temperature measurement value and the humidity measurement value respectively to determine whether the CRC check codes are correct or not; and step six, if any one or both of the comparison errors occur, re-executing the step one, and simultaneously counting one measurement abnormality.
6. The method for detecting the abnormality of the temperature and humidity sensor according to claim 2, wherein in the seventh step, whether the difference between the temperature measurement values and the humidity measurement values read in the first step and the fourth step twice exceeds the respective set threshold is compared.
7. The method according to claim 2, wherein in step eight, if either one or both of the difference between the temperature measurement value and the humidity measurement value exceeds an over-limit value, the measurement sensor may be abnormal, the measured value is unavailable, and a single possible abnormality is counted.
8. The method for detecting the abnormality of the temperature and humidity sensor according to claim 2, wherein in the ninth step, the number of possible abnormality occurrences in the eighth step is counted, and the counting of the number of possible abnormality occurrences is restarted every time the difference between the temperature measurement value and the humidity measurement value does not exceed the threshold; and judging whether the continuous possible abnormal times exceed a second time threshold, if the continuous possible abnormal times do not exceed the second time threshold, re-executing the step one, and if the continuous possible abnormal times exceed the second time threshold, indicating that the measuring sensor is abnormal.
9. The method for detecting the abnormality of the temperature and humidity sensor according to any one of claims 2 to 8, further comprising a seventh step of referencing the temperature measurement value and the temperature measurement value by the control instrument if both of the difference between the temperature measurement value and the humidity measurement value do not exceed the threshold value, and ending one measurement.
10. The temperature/humidity sensor abnormality detection method according to any one of claims 2 to 8, wherein in the third step, if the communication interface may be interfered or the measurement sensor is abnormal, the measurement sensor needs to be reset again to perform error correction processing, and meanwhile, the control instrument reports an error, and the first step is executed again; step eight, if possible abnormality occurs and the continuous possible abnormal times do not exceed a second time threshold value, the measuring sensor does not perform any treatment; and step nine, if the measuring sensor is abnormal, resetting the measuring sensor and executing the step one again.
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Address after: Room 802, No. 1696 Gangzhong Road, Xiamen Area, China (Fujian) Pilot Free Trade Zone, Xiamen City, Fujian Province, 361009

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