A temperature measuring instrument intelligent calibration method and system based on data analysis

Abstract

The invention relates to the field of temperature measuring instrument calibration, and specifically to an intelligent calibration method and system for temperature measuring instruments based on data analysis, comprising: a calibration interface module, a cooling test module, an electromagnetic relay module, an indication calibration module and an environmental stabilization module, wherein the calibration interface module is used to reserve a calibration interface and draw a cooling function, the cooling test module is used to calculate the consistency coefficient of the instrument cooling function, the electromagnetic relay module is used to access a current generating element and generate a standard cooling pulse, the indication calibration module is used to correct the indication of the standard cooling function, and the environmental stabilization module is used to adjust the calibration current in real time according to environmental errors. The invention can realize flexible and uninterrupted calibration of the instrument, avoid errors affecting measurement results, ensure the real-time accuracy of measurement results, reduce the possibility of power generation identification failures, and ensure the stability of production quality and temperature detection efficiency.

Description

Technical Field

[0001] The present invention relates to the field of temperature measuring instrument calibration, and in particular to a temperature measuring instrument intelligent calibration method and system based on data analysis. Background Art

[0002] Temperature measuring instruments are devices used to measure and monitor temperature, which can convert the temperature of an object or environment into a corresponding electrical signal for display. In power plants, temperature measuring instruments need to participate in the tripping, control and relaying of power equipment, so the accuracy calibration of the instruments is very important. However, there are many temperature measuring instruments in power plants, and traditional calibration work requires regular calibration, which is a repetitive and time-consuming process with low efficiency.

[0003] Existing instrument calibration devices convert the equipment temperature through a built-in resistance simulator and judge the accuracy of the instrument based on the changes in the temperature meter's readings. However, this method requires an external load to be connected to the power generation equipment, which may interfere with the normal operation of the equipment and cannot continuously detect the temperature meter. The continuity and stability of the calibration work are insufficient.

[0004] In addition, the working state of the temperature measuring instrument is related to environmental factors such as temperature, humidity, and equipment power. The adjustment amount set during instrument calibration may shift after the external environment changes, resulting in calibration distortion and affecting the accuracy of the temperature measuring instrument. The existing calibration method cannot specifically calibrate the temperature measuring instrument according to environmental changes. Summary of the invention

[0005] The purpose of the present invention is to provide a method and system for intelligent calibration of temperature measuring instruments based on data analysis to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: an intelligent calibration system for temperature measuring instruments based on data analysis, comprising: a calibration interface module, a cooling test module, an electromagnetic relay module, a display calibration module and an environmental stabilization module;

[0007] The verification interface module is used to reserve a serial verification interface in the temperature measuring instrument, and connect the interface connection end in series with the temperature control element. The temperature control probe is connected to the temperature measuring instrument through the serial verification interface, and the probe end is connected to a stable heat source. The stable heat source can maintain its own temperature at a set value, withdraw the stable heat source, detect the temperature readings of each temperature measuring instrument, and draw a cooling function of temperature changes over time;

[0008] The cooling test module is used to calculate the resolution and return time difference of the instrument according to the cooling functions of all the instruments, select the instrument with the highest resolution as the standard instrument, use the return time difference of the standard instrument to correct the cooling functions of other instruments, and calculate the consistency coefficient between the cooling function of the instrument and the standard cooling function;

[0009] The electromagnetic relay module is used to disconnect the temperature control probe in the verification interface and reconnect the current generating element in the verification interface. The current generating element is connected to the power supply of the power equipment through a relay. When the power supply power of the power equipment is lower than the threshold, the relay is disconnected. The current generating element receives the signal of the temperature control element and generates a standard cooling pulse with the temperature corresponding to the temperature control signal as the starting point;

[0010] The indication calibration module is used to detect the output of the standard cooling pulse, obtain the test function of the temperature meter indication, calculate the consistency coefficient between the test function and the standard cooling function, and when the difference between the consistency coefficients of the two tests is higher than a threshold, use the current generating element to continuously output the calibration current to correct the indication of the standard cooling function;

[0011] The environmental stabilization module is used to detect the environmental parameters of the temperature measuring instrument by the environmental sensor after each calibration test of the current generating element, fit the error evaluation model according to the changes in the environmental parameters and the size of the calibration current during multiple detection processes, input the current environmental factors into the model, obtain the environmental impact error, and adjust the size of the calibration current in real time according to the environmental impact error.

[0012] Further, the verification interface module includes: a temperature control probe unit, a cooling heat source unit and a current generating unit;

[0013] The temperature control probe unit is connected to a temperature measuring instrument via a serial calibration interface to detect the temperature of an external heat source;

[0014] The cooling heat source unit is used to construct a stable temperature source to increase its own temperature to a preset value;

[0015] The current generating unit can also verify the interface connected to the temperature measuring instrument, which is used to detect the signal of the temperature control element, generate a continuous pulse signal, detect the temperature control indication number, and output a calibration current to the circuit.

[0016] Further, the cooling test module includes: a consistent output unit and a time domain calibration unit;

[0017] The consistent output unit is used to remove the heat source after the temperature meter reading is stable, output the cooling curve of the temperature meter, and calculate the consistency coefficient between the measured cooling curve and the standard cooling curve;

[0018] The time domain calibration unit is used to calculate the resolution according to the fluctuation of the cooling curve, and to calculate the return difference of the instrument according to the cooling curve of each instrument.

[0019] Further, the electromagnetic relay module includes: a relay unit and a pulse generating unit;

[0020] The relay unit is used to connect the power supply of the power generation device and the current generating element, and is turned on when the power of the power generation device reaches a threshold value to wake up the current generating element;

[0021] The pulse generating unit is used to receive a signal from a temperature control element and to generate a standard cooling pulse with the temperature corresponding to the temperature control signal as a starting point.

[0022] Further, the indication calibration module includes: an indication reading unit, a cooling comparison unit and a digital calibration unit;

[0023] The indication reading unit is used to detect the output of the temperature measuring instrument after the pulse input, and obtain a test function of the output indication changing with time;

[0024] The cooling comparison unit is used to compare the difference between the consistency coefficient of the test function and the standard cooling function and the test consistency coefficient;

[0025] The digital calibration unit is used to correct the indication of the temperature measuring instrument according to the test function, and the correction value control element outputs the calibration current to the circuit.

[0026] Further, the environmental stabilization module includes: an environmental sensing unit and a model adjustment unit;

[0027] The environmental sensing unit is used to detect environmental parameters outside the temperature measuring instrument, and the environmental parameters include: temperature, humidity and power of the power generation equipment;

[0028] The model adjustment unit is used to fit the error evaluation model according to the environmental parameters and the calibration current, and to adjust the magnitude of the calibration current in real time using the error evaluation model.

[0029] A temperature measuring instrument intelligent calibration method based on data analysis, comprising the following steps:

[0030] Step S1. A calibration interface is reserved in the circuit of the temperature measuring instrument, the calibration interface is connected in series with the thermistor in the circuit, a temperature measuring probe is set, connected to the temperature measuring instrument through the calibration interface, and the temperature measuring probe is placed in a heat source with a constant temperature;

[0031] Step S2. Remove the heat source, allow the temperature probe to cool naturally to a preset temperature, plot the first function of the temperature meter's reading over time, calculate the consistency coefficient between the first function and the standard cooling function under different time delays, and output the delay corresponding to the highest consistency coefficient as the temperature measurement delay of the meter;

[0032] Step S3. Disconnect the temperature control probe in the calibration interface and connect the calibration device, which is connected to the power supply of the power equipment through a relay. When the power supply power is lower than the threshold, the relay is closed. The calibration device detects the current of the thermistor after a temperature measurement delay and outputs a standard cooling pulse based on the current size.

[0033] Step S4. After the pulse is input, the second function is obtained by reading the change in the indication of the temperature measuring instrument, and the correlation between the second function and the first function is calculated. When the correlation is lower than the threshold, the calibration current is obtained from the difference between the second function and the first function, and the calibration device is made to continuously output the calibration current to the circuit;

[0034] Step S5. The environmental sensor detects the environmental parameters of the temperature measuring instrument, takes the environmental parameters as the state variables and the reading of the temperature measuring instrument as the output variable, constructs a state model of the environmental parameters and the calibration current size, and adjusts the calibration current size according to the changes in the environmental parameters.

[0035] Further, step S1 includes:

[0036] Step S11. Disassemble the electronic temperature measuring chip of the temperature measuring instrument, set contacts on the circuit where the thermistor is located, lead out the calibration interface through electric contact, and connect the calibration interface in series with the thermistor;

[0037] Step S12. Connect a temperature measuring probe to the calibration interface, the temperature measuring probe can detect the temperature at the location of the probe and feed back to the temperature measuring instrument;

[0038] Step S13. Preset a constant heat source with a temperature of T1, place the temperature measuring probe in the constant heat source, and wait until the temperature of the temperature control instrument stops rising, then go to step S2.

[0039] Further, step S2 includes:

[0040] Step S21. Allow the temperature probe to leave the constant heat source and cool naturally until the reading of the temperature measuring instrument reaches the set value T2, where T2 < T1, and record the function F(t) of the temperature measuring instrument reading changing with time, where t represents time and F(t) is recorded as the first function;

[0041] Step S22. Calculate the consistency coefficient between the first function and the standard cooling function under different time delays according to the following formula:

[0042]

[0043] Among them, i represents the number of delays, t0 is the preset value, representing the unit delay interval, and k i represents the consistency coefficient when the delay number is i, G(t) represents the standard cooling function, V irepresents the cooling time when the delay number is i, j is the summation number, TC is the ambient temperature during the cooling process, and i is an integer i∈[0, Vi / t0];

[0044] Step S23. Traverse all possible values ​​of i and calculate the consistency coefficient, take the i value i0 corresponding to the element with the smallest consistency coefficient as the delay number, and output i0·t0 as the temperature measurement delay of the temperature measuring instrument.

[0045] Further, step S3 includes:

[0046] Step S31. Replace the temperature control probe in the calibration interface with a calibration device, wherein the calibration device has a triode element, one pole of the triode is connected to the power supply of the power device through a relay, and when the power supply power of the power device is lower than a preset threshold, the relay is turned on and a wake-up pulse is sent to the calibration device through the triode;

[0047] Step S32. After the calibration device receives the wake-up pulse, it waits for a temperature measurement delay, detects the current on the thermistor after the temperature measurement delay ends, and uses the current on the thermistor as a starting point to output a continuously decaying standard cooling pulse current to the circuit. The size I of the standard cooling pulse current satisfies I=I0·G(t), where I0 represents the current on the thermistor.

[0048] Further, step S4 includes:

[0049] Step S41. After the pulse is output, the temperature reading of the temperature measuring instrument is continuously read until the reading of the temperature measuring instrument reaches the set value T2. The function H(t) of the change of the reading of the temperature measuring instrument over time during the output process is recorded as the second function of the temperature measuring instrument;

[0050] Step S42. Calculate the correlation between the first function and the second function:

[0051]

[0052] Where Q represents the correlation between the first function and the second function, V i0 Represents the cooling time when the delay number is i0;

[0053] Step S43. When the correlation Q value is less than the preset value, it is determined that there is a deviation in the instrument, and the calibration device is instructed to continuously output a calibration current to the circuit, and the magnitude of the calibration current IE satisfies IE=I0·[H(t)-F(t+i·t0)] until a wake-up pulse is received again after the relay is turned on.

[0054] Further, step S5 includes:

[0055] Step S51. When outputting the calibration current, detecting the environmental parameters of the temperature measuring instrument, the environmental parameters include: temperature, humidity and power of the power generation equipment;

[0056] Step S52. Detect environmental parameters and the readings of the thermometer at fixed intervals, use all environmental parameters as input state variables, and the readings of the thermometer as output variables, use Tableau modeling tools to establish a state model, use the historically collected state variables and output variables as fitting materials, and output the environmental state model;

[0057] Step S53. After the model is constructed, the collected environmental parameters are input as excitation signals into the environmental state model to obtain the expected reading of the temperature measuring instrument, and the expected reading is compared with the current reading. The comparison result is constructed to adjust the calibration current so that the adjusted reading is the same as the expected reading.

[0058] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0059] 1. The present invention can reserve a serial verification interface in the temperature measuring instrument and connect it in series with the temperature control element, connect the temperature control probe to a stable cooling heat source through the serial verification interface, identify the resolution and return difference of the temperature control instrument, and enable the temperature measuring instrument to provide reliable temperature data, thereby reducing temperature errors and ensuring the stability of production quality and power generation efficiency.

[0060] 2. The present invention can connect a current generating element to the calibration interface. After the relay is disconnected, a standard cooling pulse is generated with the current indicated by the temperature control signal as the starting point. The consistency coefficient is calculated according to the temperature meter indication. By calibrating the current regulator indication, flexible and uninterrupted calibration of the instrument can be achieved, avoiding errors affecting the measurement results, ensuring the real-time accuracy of the measurement results, reducing the possibility of power generation identification failures, and reducing maintenance costs.

[0061] 3. The present invention can detect the temperature, humidity, equipment power and calibration current during calibration, establish an error evaluation model, input the current environmental factors into the model, and continuously adjust the calibration current, which can better meet actual test needs, improve equipment applicability, and increase data interpretation capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0063] Figure 1 It is a structural schematic diagram of a temperature measuring instrument intelligent calibration system based on data analysis of the present invention;

[0064] Figure 2It is a schematic diagram of the steps of a temperature measuring instrument intelligent calibration method based on data analysis of the present invention. DETAILED DESCRIPTION

[0065] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0066] See also Figure 1 ,The present invention provides a technical solution: an intelligent calibration system for temperature measuring instruments based on data analysis, comprising: a calibration interface module, a cooling test module, an electromagnetic relay module, a display calibration module and an environmental stabilization module;

[0067] The verification interface module is used to reserve a serial verification interface in the temperature measuring instrument, and connect the interface connection end in series with the temperature control element. The temperature control probe is connected to the temperature measuring instrument through the serial verification interface, and the probe end is connected to a stable heat source. The stable heat source can maintain its own temperature at a set value, withdraw the stable heat source, detect the temperature readings of each temperature measuring instrument, and draw a cooling function of temperature changes over time;

[0068] The verification interface module includes: a temperature control probe unit, a cooling heat source unit and a current generating unit;

[0069] The temperature control probe unit is connected to a temperature measuring instrument via a serial calibration interface to detect the temperature of an external heat source;

[0070] The cooling heat source unit is used to construct a stable temperature source to increase its own temperature to a preset value;

[0071] The current generating unit can also verify the interface connected to the temperature measuring instrument, which is used to detect the signal of the temperature control element, generate a continuous pulse signal, detect the temperature control indication number, and output a calibration current to the circuit.

[0072] The cooling test module is used to calculate the resolution and return time difference of the instrument according to the cooling functions of all the instruments, select the instrument with the highest resolution as the standard instrument, use the return time difference of the standard instrument to correct the cooling functions of other instruments, and calculate the consistency coefficient between the cooling function of the instrument and the standard cooling function;

[0073] The cooling test module includes: a consistent output unit and a time domain calibration unit;

[0074] The consistent output unit is used to remove the heat source after the temperature meter reading is stable, output the cooling curve of the temperature meter, and calculate the consistency coefficient between the measured cooling curve and the standard cooling curve;

[0075] The time domain calibration unit is used to calculate the resolution according to the fluctuation of the cooling curve, and to calculate the return difference of the instrument according to the cooling curve of each instrument.

[0076] The electromagnetic relay module is used to disconnect the temperature control probe in the verification interface and reconnect the current generating element in the verification interface. The current generating element is connected to the power supply of the power equipment through a relay. When the power supply power of the power equipment is lower than the threshold, the relay is disconnected. The current generating element receives the signal of the temperature control element and generates a standard cooling pulse with the temperature corresponding to the temperature control signal as the starting point;

[0077] The electromagnetic relay module comprises: a relay unit and a pulse generating unit;

[0078] The relay unit is used to connect the power supply of the power generation device and the current generating element, and is turned on when the power of the power generation device reaches a threshold value to wake up the current generating element;

[0079] The pulse generating unit is used to receive a signal from a temperature control element and to generate a standard cooling pulse with the temperature corresponding to the temperature control signal as a starting point.

[0080] The indication calibration module is used to detect the output of the standard cooling pulse, obtain the test function of the temperature meter indication, calculate the consistency coefficient between the test function and the standard cooling function, and when the difference between the consistency coefficients of the two tests is higher than a threshold, use the current generating element to continuously output the calibration current to correct the indication of the standard cooling function;

[0081] The indication calibration module comprises: an indication reading unit, a cooling comparison unit and a digital calibration unit;

[0082] The indication reading unit is used to detect the output of the temperature measuring instrument after the pulse input, and obtain a test function of the output indication changing with time;

[0083] The cooling comparison unit is used to compare the difference between the consistency coefficient of the test function and the standard cooling function and the test consistency coefficient;

[0084] The digital calibration unit is used to correct the indication of the temperature measuring instrument according to the test function, and the correction value control element outputs the calibration current to the circuit.

[0085] The environmental stabilization module is used to detect the environmental parameters of the temperature measuring instrument by the environmental sensor after each calibration test of the current generating element, fit the error evaluation model according to the changes in the environmental parameters and the size of the calibration current during multiple detection processes, input the current environmental factors into the model, obtain the environmental impact error, and adjust the size of the calibration current in real time according to the environmental impact error.

[0086] The environmental stabilization module includes: an environmental sensing unit and a model adjustment unit;

[0087] The environmental sensing unit is used to detect environmental parameters outside the temperature measuring instrument, and the environmental parameters include: temperature, humidity and power of the power generation equipment;

[0088] The model adjustment unit is used to fit the error evaluation model according to the environmental parameters and the calibration current, and to adjust the magnitude of the calibration current in real time using the error evaluation model.

[0089] like Figure 2 As shown, a temperature measuring instrument intelligent calibration method based on data analysis includes the following steps:

[0090] Step S1. A calibration interface is reserved in the circuit of the temperature measuring instrument, the calibration interface is connected in series with the thermistor in the circuit, a temperature measuring probe is set, connected to the temperature measuring instrument through the calibration interface, and the temperature measuring probe is placed in a heat source with a constant temperature;

[0091] Step S1 includes:

[0092] Step S11. Disassemble the electronic temperature measuring chip of the temperature measuring instrument, set contacts on the circuit where the thermistor is located, lead out the calibration interface through electric contact, and connect the calibration interface in series with the thermistor;

[0093] Step S12. Connect a temperature measuring probe to the calibration interface, the temperature measuring probe can detect the temperature at the location of the probe and feed back to the temperature measuring instrument;

[0094] Step S13. Preset a constant heat source with a temperature of T1, place the temperature measuring probe in the constant heat source, and wait until the temperature of the temperature control instrument stops rising, then go to step S2.

[0095] Step S2. Remove the heat source, allow the temperature probe to cool naturally to a preset temperature, plot the first function of the temperature meter's reading over time, calculate the consistency coefficient between the first function and the standard cooling function under different time delays, and output the delay corresponding to the highest consistency coefficient as the temperature measurement delay of the meter;

[0096] Step S2 includes:

[0097] Step S21. Allow the temperature probe to leave the constant heat source and cool naturally until the reading of the temperature measuring instrument reaches the set value T2, where T2 < T1, and record the function F(t) of the temperature measuring instrument reading changing with time, where t represents time and F(t) is recorded as the first function;

[0098] Step S22. Calculate the consistency coefficient between the first function and the standard cooling function under different time delays according to the following formula:

[0099]

[0100] Among them, i represents the number of delays, t0 is the preset value, representing the unit delay interval, and k i represents the consistency coefficient when the delay number is i, G(t) represents the standard cooling function, V i represents the cooling time when the delay number is i, j is the summation number, TC is the ambient temperature during the cooling process, and i is an integer i∈[0, Vi / t0];

[0101] Step S23. Traverse all possible values ​​of i and calculate the consistency coefficient, take the i value i0 corresponding to the element with the smallest consistency coefficient as the delay number, and output i0·t0 as the temperature measurement delay of the temperature measuring instrument.

[0102] Step S3. Disconnect the temperature control probe in the calibration interface and connect the calibration device, which is connected to the power supply of the power equipment through a relay. When the power supply power is lower than the threshold, the relay is closed. The calibration device detects the current of the thermistor after a temperature measurement delay and outputs a standard cooling pulse based on the current size.

[0103] Step S3 includes:

[0104] Step S31. Replace the temperature control probe in the calibration interface with a calibration device, wherein the calibration device has a triode element, one pole of the triode is connected to the power supply of the power device through a relay, and when the power supply power of the power device is lower than a preset threshold, the relay is turned on and a wake-up pulse is sent to the calibration device through the triode;

[0105] Step S32. After the calibration device receives the wake-up pulse, it waits for a temperature measurement delay, detects the current on the thermistor after the temperature measurement delay ends, and uses the current on the thermistor as a starting point to output a continuously decaying standard cooling pulse current to the circuit. The size I of the standard cooling pulse current satisfies I=I0·G(t), where I0 represents the current on the thermistor.

[0106] Step S4. After the pulse is input, the second function is obtained by reading the change in the indication of the temperature measuring instrument, and the correlation between the second function and the first function is calculated. When the correlation is lower than the threshold, the calibration current is obtained from the difference between the second function and the first function, and the calibration device is made to continuously output the calibration current to the circuit;

[0107] Step S4 includes:

[0108] Step S41. After the pulse is output, the temperature reading of the temperature measuring instrument is continuously read until the reading of the temperature measuring instrument reaches the set value T2. The function H(t) of the change of the reading of the temperature measuring instrument over time during the output process is recorded as the second function of the temperature measuring instrument;

[0109] Step S42. Calculate the correlation between the first function and the second function:

[0110]

[0111] Where Q represents the correlation between the first function and the second function, V i0 Represents the cooling time when the delay number is i0;

[0112] Step S43. When the correlation Q value is less than the preset value, it is determined that there is a deviation in the instrument, and the calibration device is instructed to continuously output a calibration current to the circuit, and the magnitude of the calibration current IE satisfies IE=I0·[H(t)-F(t+i·t0)] until a wake-up pulse is received again after the relay is turned on.

[0113] Step S5. The environmental sensor detects the environmental parameters of the temperature measuring instrument, takes the environmental parameters as the state variables and the reading of the temperature measuring instrument as the output variable, constructs a state model of the environmental parameters and the calibration current size, and adjusts the calibration current size according to the changes in the environmental parameters.

[0114] Step S5 includes:

[0115] Step S51. When outputting the calibration current, detecting the environmental parameters of the temperature measuring instrument, the environmental parameters include: temperature, humidity and power of the power generation equipment;

[0116] Step S52. Detect environmental parameters and the readings of the thermometer at fixed intervals, use all environmental parameters as input state variables, and the readings of the thermometer as output variables, use Tableau modeling tools to establish a state model, use the historically collected state variables and output variables as fitting materials, and output the environmental state model;

[0117] Step S53. After the model is constructed, the collected environmental parameters are input as excitation signals into the environmental state model to obtain the expected reading of the temperature measuring instrument, and the expected reading is compared with the current reading. The comparison result is constructed to adjust the calibration current so that the adjusted reading is the same as the expected reading.

[0118] Embodiment: The temperature measuring instrument detects a heat source of 50°C at a room temperature of 20°C, and naturally cools to a reading of 30°C after the reading stabilizes. The consistency of the reading change function during the cooling process and the standard cooling function is calculated. If the consistency of the time delays of 1s, 2s, 3s and 4s is 2.0, 5.2, 3.1 and 4.4 respectively, the time delay of the temperature measuring instrument is judged to be 1s;

[0119] When the power of the electrical equipment is lower than the preset power of 10W, the calibration device on the temperature measuring instrument is awakened. The calibration device detects that the current at the thermistor is 10mA, and the calculated correlation between the first function and the second function is less than the threshold, then the calibration current is continuously output in the circuit.

[0120] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0121] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A temperature measuring instrument intelligent calibration method based on data analysis, characterized in that: The method comprises the following steps: Step S1. A calibration interface is reserved in the circuit of the temperature measuring instrument, the calibration interface is connected in series with the thermistor in the circuit, a temperature measuring probe is set, connected to the temperature measuring instrument through the calibration interface, and the temperature measuring probe is placed in a heat source with a constant temperature; Step S2. Remove the heat source, allow the temperature probe to cool naturally to a preset temperature, plot the first function of the temperature meter's reading over time, calculate the consistency coefficient between the first function and the standard cooling function under different time delays, and output the delay corresponding to the highest consistency coefficient as the temperature measurement delay of the meter; Step S3. Disconnect the temperature control probe in the calibration interface and connect the calibration device, which is connected to the power supply of the power equipment through a relay. When the power supply power is lower than the threshold, the relay is closed. The calibration device detects the current of the thermistor after a temperature measurement delay and outputs a standard cooling pulse based on the current size. Step S4. After the pulse is input, the second function is obtained by reading the change in the indication of the temperature measuring instrument, and the correlation between the second function and the first function is calculated. When the correlation is lower than the threshold, the calibration current is obtained from the difference between the second function and the first function, and the calibration device is made to continuously output the calibration current to the circuit; Step S5. The environmental sensor detects the environmental parameters of the temperature measuring instrument, takes the environmental parameters as the state variables and the reading of the temperature measuring instrument as the output variable, constructs a state model of the environmental parameters and the calibration current size, and adjusts the calibration current size according to the changes in the environmental parameters.

2. According to claim 1, a temperature measuring instrument intelligent calibration method based on data analysis is characterized in that: Step S1 includes: Step S11. Disassemble the electronic temperature measuring chip of the temperature measuring instrument, set contacts on the circuit where the thermistor is located, lead out the calibration interface through electric contact, and connect the calibration interface in series with the thermistor; Step S12. Connect a temperature measuring probe to the calibration interface, the temperature measuring probe can detect the temperature at the location of the probe and feed back to the temperature measuring instrument; Step S13. Preset a constant heat source with a temperature of T1, place the temperature measuring probe in the constant heat source, and wait until the temperature of the temperature control instrument stops rising, then go to step S2.

3. According to claim 2, a temperature measuring instrument intelligent calibration method based on data analysis is characterized in that: Step S2 includes: Step S21. Allow the temperature probe to leave the constant heat source and cool naturally until the reading of the temperature measuring instrument reaches the set value T2, where T2 < T1, and record the function F(t) of the temperature measuring instrument reading changing with time, where t represents time and F(t) is recorded as the first function; Step S22. Calculate the consistency coefficient between the first function and the standard cooling function under different time delays according to the following formula: Among them, i represents the number of delays, t0 is the preset value, representing the unit delay interval, and k i represents the consistency coefficient when the delay number is i, G(t) represents the standard cooling function, V i represents the cooling time when the delay number is i, j is the summation number, TC is the ambient temperature during the cooling process, and i is an integer i∈[0, Vi / t0]; Step S23. Traverse all possible values ​​of i and calculate the consistency coefficient, take the i value i0 corresponding to the element with the smallest consistency coefficient as the delay number, and output i0·t0 as the temperature measurement delay of the temperature measuring instrument.

4. The intelligent calibration method for temperature measuring instruments based on data analysis according to claim 3 is characterized in that: Step S3 includes: Step S31. Replace the temperature control probe in the calibration interface with a calibration device, wherein the calibration device has a triode element, one pole of the triode is connected to the power supply of the power device through a relay, and when the power supply power of the power device is lower than a preset threshold, the relay is turned on and a wake-up pulse is sent to the calibration device through the triode; Step S32. After the calibration device receives the wake-up pulse, it waits for a temperature measurement delay, detects the current on the thermistor after the temperature measurement delay ends, and outputs a continuously decaying standard cooling pulse current to the circuit, taking the current on the thermistor as the starting point. The standard cooling pulse current satisfies I=I0·G(t), where I0 represents the current on the thermistor. Step S4 includes: Step S41. After the pulse is output, the temperature reading of the temperature measuring instrument is continuously read until the reading of the temperature measuring instrument reaches the set value T2. The function H(t) of the change of the reading of the temperature measuring instrument over time during the output process is recorded as the second function of the temperature measuring instrument; Step S42. Calculate the correlation between the first function and the second function: Where Q represents the correlation between the first function and the second function, V i0 Represents the cooling time when the delay number is i0; Step S43. When the correlation Q value is less than the preset value, it is determined that there is a deviation in the instrument, and the calibration device is instructed to continuously output a calibration current to the circuit, and the magnitude of the calibration current IE satisfies IE=I0·[H(t)-F(t+i·t0)] until a wake-up pulse is received again after the relay is turned on.

5. The intelligent calibration method for temperature measuring instruments based on data analysis according to claim 4 is characterized in that: Step S5 includes: Step S51. When outputting the calibration current, detecting the environmental parameters of the temperature measuring instrument, the environmental parameters include: temperature, humidity and power of the power generation equipment; Step S52. Detect environmental parameters and the readings of the thermometer at fixed intervals, use all environmental parameters as input state variables, and the readings of the thermometer as output variables, use Tableau modeling tools to establish a state model, use the historically collected state variables and output variables as fitting materials, and output the environmental state model; Step S53. After the model is constructed, the collected environmental parameters are input as excitation signals into the environmental state model to obtain the expected reading of the temperature measuring instrument, and the expected reading is compared with the current reading. The comparison result is constructed to adjust the calibration current so that the adjusted reading is the same as the expected reading.

6. An intelligent temperature measuring instrument calibration system based on data analysis, characterized in that: The system includes the following modules: a calibration interface module, a cooling test module, an electromagnetic relay module, an indication calibration module and an environmental stabilization module; The verification interface module is used to reserve a serial verification interface in the temperature measuring instrument, and connect the interface connection end in series with the temperature control element. The temperature control probe is connected to the temperature measuring instrument through the serial verification interface, and the probe end is connected to a stable heat source. The stable heat source can maintain its own temperature at a set value, withdraw the stable heat source, detect the temperature readings of each temperature measuring instrument, and draw a cooling function of temperature changes over time; The cooling test module is used to calculate the resolution and return time difference of the instrument according to the cooling functions of all the instruments, select the instrument with the highest resolution as the standard instrument, use the return time difference of the standard instrument to correct the cooling functions of other instruments, and calculate the consistency coefficient between the cooling function of the instrument and the standard cooling function; The electromagnetic relay module is used to disconnect the temperature control probe in the verification interface and reconnect the current generating element in the verification interface. The current generating element is connected to the power supply of the power equipment through a relay. When the power supply power of the power equipment is lower than the threshold, the relay is disconnected. The current generating element receives the signal of the temperature control element and generates a standard cooling pulse with the temperature corresponding to the temperature control signal as the starting point; The indication calibration module is used to detect the output of the standard cooling pulse, obtain the test function of the temperature meter indication, calculate the consistency coefficient between the test function and the standard cooling function, and when the difference between the consistency coefficients of the two tests is higher than a threshold, use the current generating element to continuously output the calibration current to correct the indication of the standard cooling function; The environmental stabilization module is used to detect the environmental parameters of the temperature measuring instrument by the environmental sensor after each calibration test of the current generating element, fit the error evaluation model according to the changes in the environmental parameters and the size of the calibration current during multiple detection processes, input the current environmental factors into the model, obtain the environmental impact error, and adjust the size of the calibration current in real time according to the environmental impact error.

7. The intelligent temperature measuring instrument calibration system based on data analysis according to claim 6 is characterized in that: The verification interface module includes: a temperature control probe unit, a cooling heat source unit and a current generating unit; The temperature control probe unit is connected to a temperature measuring instrument via a serial calibration interface to detect the temperature of an external heat source; The cooling heat source unit is used to construct a stable temperature source to increase its own temperature to a preset value; The current generating unit can also verify the interface connected to the temperature measuring instrument, which is used to detect the signal of the temperature control element, generate a continuous pulse signal, detect the temperature control indication number, and output a calibration current to the circuit.

8. The temperature measuring instrument intelligent calibration system based on data analysis according to claim 7 is characterized in that: The cooling test module includes: a consistent output unit and a time domain calibration unit; The consistent output unit is used to remove the heat source after the temperature meter reading is stable, output the cooling curve of the temperature meter, and calculate the consistency coefficient between the measured cooling curve and the standard cooling curve; The time domain calibration unit is used to calculate the resolution according to the fluctuation of the cooling curve, and to calculate the return difference of the instrument according to the cooling curve of each instrument; The electromagnetic relay module comprises: a relay unit and a pulse generating unit; The relay unit is used to connect the power supply of the power generation device and the current generating element, and is turned on when the power of the power generation device reaches a threshold value to wake up the current generating element; The pulse generating unit is used to receive a signal from a temperature control element and to generate a standard cooling pulse with the temperature corresponding to the temperature control signal as a starting point.

9. The intelligent calibration system for temperature measuring instruments based on data analysis according to claim 8 is characterized in that: The indication calibration module comprises: an indication reading unit, a cooling comparison unit and a digital calibration unit; The indication reading unit is used to detect the output of the temperature measuring instrument after the pulse input, and obtain a test function of the output indication changing with time; The cooling comparison unit is used to compare the difference between the consistency coefficient of the test function and the standard cooling function and the test consistency coefficient; The digital calibration unit is used to correct the indication of the temperature measuring instrument according to the test function, and the correction value control element outputs the calibration current to the circuit.

10. The temperature measuring instrument intelligent calibration system based on data analysis according to claim 9 is characterized in that: The environmental stabilization module includes: an environmental sensing unit and a model adjustment unit; The environmental sensing unit is used to detect environmental parameters outside the temperature measuring instrument, and the environmental parameters include: temperature, humidity and power of the power generation equipment; The model adjustment unit is used to fit the error evaluation model according to the environmental parameters and the calibration current, and to adjust the magnitude of the calibration current in real time using the error evaluation model.

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