CN111982357A - Algorithm and system for stabilizing temperature test value of temperature sensor - Google Patents
Algorithm and system for stabilizing temperature test value of temperature sensor Download PDFInfo
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Abstract
The invention discloses an algorithm for stabilizing a temperature test value of a temperature sensor, which adds an equation step on the basis of the existing temperature sensor, utilizes an approach value of the temperature sensor to the self variance of the temperature detection and a calculation variance of a group of data acquired by the currently measured temperature data to comprehensively obtain the actual fluctuation amplitude of the temperature sensor to the temperature measurement and the measurement gain considering the temperature measurement, obtains a corrected test data value according to a formula A ═ N + G (N-M), and acquires the actual value of the temperature according to the data value by combining the gain coefficient and the gain reduction coefficient of the temperature sensor; in addition, a system for stabilizing the temperature test value of the temperature sensor is provided, which combines the foregoing, and aims to provide an algorithm and a system for stabilizing the temperature test value of the temperature sensor, which are used for stabilizing the problem that the existing temperature sensor is unstable in temperature detection, so as to improve the detection precision of the temperature sensor.
Description
Technical Field
The invention relates to the field of temperature measurement, in particular to an algorithm and a system for stabilizing a temperature test value of a temperature sensor.
Background
At present, because the temperature of an object in a field of view needs to be calculated according to the temperature of a sensor, if the read temperature has deviation, the measured physical temperature in the field of view is also inaccurate, so that the temperature measurement is inaccurate, the temperature measurement is easily mistakenly reported, and a lot of diagnosis deviation is caused.
In addition, due to the influence of communication reasons, self errors of the sensor and other reasons, the acquired temperature of the sensor has larger errors, and finally, the measurement is inaccurate.
Disclosure of Invention
The invention aims to solve at least one problem in the prior art, and aims to provide an algorithm and a system for stabilizing a temperature test value of a temperature sensor.
In order to achieve the purpose, the technical scheme of the invention is as follows:
an algorithm for stabilizing temperature test values of a temperature sensor, comprising the steps of:
s1: providing a temperature sensor, said temperature sensor comprising a plurality of data spaces, using a measured temperature of an object within a field of view of the temperature sensor, and said temperature sensor having a first variance for temperature measurements;
s2: ordering a plurality of data spaces in sequence, the data in the data spaces being denoted as PTAT1PTATn, when the plurality of data spaces are all filled with data, calculating the data in the plurality of data spaces and obtaining a second variance, and calculating the average value of the data and recording the average value as A;
s3: obtaining a third variance according to the first variance and the second variance obtained in the steps S1 and S2, and recording the third variance as p, wherein the third variance is the sum of the first variance and the second variance, and the third variance is the maximum amplitude of the data in the step S2;
s4: providing a controllable measurement error value Z, updating the measurement gain of the current measurement to the third variance in step S3 and the ratio of the third variance to the sum of the measurement error values, and recording as G;
s5: reading data PTATn tested by the temperature sensor and recording the data PTATn as N, reading data PTATn-1 tested by the temperature sensor at the previous time of the data PTATn, and recording the data PTATn-1 as M;
s6: calculating to obtain a current output data value tested by the temperature sensor according to a formula A, namely N + G (N-M), and recording the current output data value into the data space in the step S1;
s7: after step S6 is completed, an average value in the data space is calculated, and then an actual temperature value of the temperature measured by the temperature sensor at the current time is calculated by using a formula T ═ PTAT ═ PTATgr + PTAToff, where PTATgr represents a gain coefficient of the temperature sensor, and PTAToff represents a reduction coefficient of the temperature sensor.
The invention relates to an algorithm for stabilizing a temperature test value of a temperature sensor, which adds an equation step on the basis of the existing temperature sensor, utilizes the approach value of the temperature sensor to the self variance of the temperature detection and the calculation variance of a group of data acquired by the currently measured temperature data to comprehensively obtain the actual fluctuation amplitude of the temperature sensor to the temperature measurement and the measurement gain considering the temperature measurement, obtains a corrected test data value according to a formula A ═ N + G (N-M), and acquires the actual value of the temperature according to the data value by combining the gain coefficient and the gain reducing coefficient of the temperature sensor. The invention leads the dynamic measurement curve of the temperature sensor for temperature detection to tend to be stable through simple calculation steps, thereby ensuring that the temperature measurement of the temperature sensor does not change suddenly and ensuring the measurement precision.
Further, the step S1 further includes:
the temperature sensor reads data values corresponding to the number of data spaces and records the plurality of data values into the data spaces.
Further, the data space has 32.
Further, the step S4 further includes: and reading the temperature data value tested by the temperature sensor at the current time, comparing the temperature data value with the last data value of the current time, and discarding the temperature data value tested at the current time if the difference value between the two data values exceeds the measurement error value.
Further, the step S6 further includes the following steps:
s6.1: removing data PTAT when a plurality of said data space records are full1And the value is used for storing the current output data value tested by the temperature sensor.
Further, the step S6 further includes the following steps:
s6.2: after the output data value is tested by the temperature sensor at the current time and recorded into the data space in step S1, the fourth difference is calculated and obtained according to the data group in the current data space, and is recorded as PiAnd P isi＝(1-G) *p。
Further, the step S7 is followed by the following steps:
s8: and 4, calculating the actual temperature value of the temperature sensor for temperature test through steps 4 to 7 every time the temperature sensor performs temperature test.
The invention also provides a system for stabilizing the temperature measurement value of the temperature sensor, which comprises
The temperature acquisition module is used for acquiring a measured temperature value of an object;
the conversion module is used for carrying out analog-to-digital conversion on the measurement temperature value acquired by the temperature acquisition module;
the storage module is used for storing the digitized measured temperature value processed by the conversion module, the storage module specifically comprises a plurality of data spaces and sequences the data spaces in sequence, and the data value in the data space is recorded as PTAT1～PTATn：
A calculation module, configured to calculate actual measurement values of measurement gain, variance, and temperature of data recorded in the storage module, where the calculation module specifically includes: reading the data tested by the temperature sensor and recording the data as N, reading the data tested by the temperature sensor at the previous time and recording the data as M; calculating to obtain a current output data value tested by the temperature sensor according to a formula A (N + G) (N-M), and recording the current output data value into a storage module; in addition, an average value in the data space is calculated, an actual temperature value of the temperature measured by the temperature sensor at the current time is calculated through a formula T ═ PTAT ═ PTATgr (PTATff), wherein PTATgr represents a gain coefficient of the temperature sensor, PTATff represents a reduction coefficient of the temperature sensor, and the temperature display module is used for displaying the actual value of the temperature of the object, wherein the actual value of the temperature of the object is acquired by the temperature acquisition module.
For a better understanding and practice, the invention is described in detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic flow chart of an embodiment of the present invention;
FIG. 2 is a temperature chart of a temperature sensor test at ambient temperature condition of 16 ℃ without the algorithm of the present invention;
FIG. 3 is a temperature chart of a temperature sensor test at 25 deg.C ambient temperature with the algorithm of the present invention applied;
fig. 4 is a system configuration diagram of the present invention.
Detailed Description
In order to better illustrate the invention, the invention is described in further detail below with reference to the accompanying drawings.
As shown in FIG. 1, a flow diagram of the present invention is shown;
as shown in fig. 2, a graph of the temperature of a temperature sensor test at ambient temperature of 16 ℃ without the application of the algorithm of the present invention is shown;
as shown in fig. 3, a graph of the temperature of a temperature sensor test at ambient temperature of 16 ℃ after applying the algorithm of the present invention is shown;
an algorithm for stabilizing temperature test values of a temperature sensor, comprising the steps of:
s1: providing a temperature sensor, said temperature sensor comprising a plurality of data spaces, using a measured temperature of an object within a field of view of the temperature sensor, and said temperature sensor having a first variance for temperature measurements;
s2: ordering a plurality of data spaces in sequence, the data in the data spaces being denoted as PTAT1PTATn, when the plurality of data spaces are all filled with data, calculating the data in the plurality of data spaces and obtaining a second variance, and calculating the average value of the data and recording the average value as A;
s3: obtaining a third variance according to the first variance and the second variance obtained in the steps S1 and S2, and recording the third variance as p, wherein the third variance is the sum of the first variance and the second variance, and the third variance is the maximum amplitude of the data in the step S2;
s4: providing a controllable measurement error value Z, updating the measurement gain of the current measurement to the third variance in step S3 and the ratio of the third variance to the sum of the measurement error values, and recording as G;
s5: reading data PTATn tested by the temperature sensor and recording the data PTATn as N, reading data PTATn-1 tested by the temperature sensor at the previous time of the data PTATn, and recording the data PTATn-1 as M;
s6: calculating to obtain a current output data value tested by the temperature sensor according to a formula A, namely N + G (N-M), and recording the current output data value into the data space in the step S1;
s7: after step S6 is completed, an average value in the data space is calculated, and then an actual temperature value of the temperature measured by the temperature sensor at the current time is calculated by using a formula T ═ PTAT ═ PTATgr + PTAToff, where PTATgr represents a gain coefficient of the temperature sensor, and PTAToff represents a reduction coefficient of the temperature sensor.
The method is characterized in that an arithmetic formula step is added on the basis of an existing temperature sensor basic algorithm, the approximate value of the self variance of the temperature sensor for temperature detection and the calculation variance of a group of data acquired by the temperature data currently measured are utilized to comprehensively obtain the actual fluctuation amplitude of the temperature sensor for temperature measurement and the measurement gain of the temperature sensor in consideration of temperature measurement, a corrected test data value is obtained according to a formula A which is N + G (N-M), and the actual value of the temperature is acquired according to the data value by combining the gain coefficient and the reduction coefficient of the temperature sensor. The invention leads the dynamic measurement curve of the temperature sensor for temperature detection to tend to be stable through simple calculation steps, thereby ensuring that the temperature measurement of the temperature sensor does not change suddenly and ensuring the measurement precision.
In the embodiment of the invention, the temperature sensor adopts a Heiman HTPA32X32 sensor, in particular, the temperature sensor comprises 8 data bits, and the first byte combination and the second byte combination of each data bit are denoted as PTATi.
The data value calculation formula of the actual test temperature obtained by applying the temperature sensor is (taking 8 data bits as an example), and PTAT ═ is1+PTAT2+PTAT3+PTAT4+PTAT5+PTAT6+PTAT7+PTAT8)/8。
In the embodiment of the present invention, the first variance is an empirical value obtained by performing a large number of tests on the temperature sensor itself, and a value obtained by performing value calculation on the temperature sensor through multiple measurements represents a first-order fluctuation degree of an average amplitude of the sensor, which is not described in detail.
The invention will be further explained with reference to the above examples,
the temperature of the sensor is affected by the heat generated by the internal components of the sensor and the ambient temperature, namely, the temperature is related to heat dissipation. Therefore, if the sensor is always working normally, it is mainly affected by the ambient temperature. However, the ambient temperature is relatively constant for a short time, and the sensor temperature is generally considered to be constant for 5 seconds.
The step S1 further includes:
the temperature sensor reads data values corresponding to the number of data spaces and records the plurality of data values in the data spaces in order to store each temperature data value of the temperature sensor in the data space, such that a relatively accurate second variance is obtained.
The number of the data spaces is 32, and firstly, the data spaces are applied on codes written by software and used for storing PTAT values/data, because in the testing process, it is found that if only the average value of the original 8 data bits is adopted each time, relatively large fluctuation is caused, and temperature measurement errors are caused. Therefore, some processing is required.
In addition, in this embodiment, the temperature data value measured by the temperature sensor at the current time is read, the temperature data value is compared with the last data value at the current time, and if the difference between the two data values exceeds the measurement error value, the temperature data value measured at the current time is discarded to ensure the measurement accuracy.
Another expression is that the field environment where the temperature sensor is located has a sudden change, and after the field environment is confirmed to have a sudden change, the temperature sensor is required to discard all current temperature test data and reacquire data to store in the data space.
The step S6 further includes the following steps:
s6.1: removing data PTAT when a plurality of said data space records are full1And the value is used for storing the current output data value tested by the temperature sensor.
The step S6 further includes the following steps:
s6.2: after the output data value is tested by the temperature sensor at the current time and recorded into the data space in step S1, the fourth difference is calculated and obtained according to the data group in the current data space, and is recorded as PiAnd P isi＝ (1-G)*p。
Step S6.1 and step S6.2 may be in an interleaved sequence, the fourth variance having a role in each temperature test of the temperature sensor which is equivalent to the second variance described above.
On the other hand, if one extends to an infinite number of temperature tests of the temperature sensor, then the fourth difference tends to a steady value, PiThe actual test temperature of the finally obtained temperature sensor also tends to be a stable value without having a large range of fluctuation.
The step S7 is followed by the following steps:
s8: each time the temperature sensor performs the temperature test, the actual temperature value of the temperature sensor performing the temperature test needs to be calculated through steps S4 to S7.
As shown in fig. 4, the present invention further provides a system for stabilizing a temperature measurement value of a temperature sensor, including a temperature acquisition module, where the temperature acquisition module is used to acquire a measurement temperature value of an object;
the conversion module is used for carrying out analog-to-digital conversion on the measurement temperature value acquired by the temperature acquisition module;
the storage module is used for storing the digitized measured temperature value processed by the conversion module, the storage module specifically comprises a plurality of data spaces and sequences the data spaces in sequence, and the data value in the data space is recorded as PTAT1～PTATn：
A calculation module, configured to calculate actual measurement values of measurement gain, variance, and temperature of data recorded in the storage module, where the calculation module specifically includes: reading the data tested by the temperature sensor and recording the data as N, reading the data tested by the temperature sensor at the previous time and recording the data as M; calculating to obtain a current output data value tested by the temperature sensor according to a formula A (N + G) (N-M), and recording the current output data value into a storage module; in addition, an average value in the data space is calculated, and then an actual temperature value of the temperature measured by the temperature sensor at the current time is calculated through a formula T ═ PTAT (PTATGr + PTATaff), wherein PTATGr represents a gain coefficient of the temperature sensor, and PTATaff represents a reduction coefficient of the temperature sensor;
and the temperature display module is used for displaying the actual value of the temperature of the object by the temperature acquisition module.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (8)
1. An algorithm for stabilizing a temperature test value of a temperature sensor, comprising the steps of:
s1: providing a temperature sensor, said temperature sensor comprising a plurality of data spaces, using a measured temperature of an object within a field of view of the temperature sensor, and said temperature sensor having a first variance for temperature measurements;
s2: ordering a plurality of data spaces in sequence, the data in the data spaces being denoted as PTAT1PTATn, when the plurality of data spaces are all filled with data, calculating the data in the plurality of data spaces and obtaining a second variance, and calculating the average value of the data and recording the average value as A;
s3: obtaining a third variance according to the first variance and the second variance obtained in the steps S1 and S2, and recording the third variance as p, wherein the third variance is the sum of the first variance and the second variance, and the third variance is the maximum amplitude of the data in the step S2;
s4: providing a controllable measurement error value Z, updating the measurement gain of the current measurement to the third variance in step S3 and the ratio of the third variance to the sum of the measurement error values, and recording as G;
s5: reading data PTATn tested by the temperature sensor and recording the data PTATn as N, reading data PTATn-1 tested by the temperature sensor at the previous time of the data PTATn, and recording the data PTATn-1 as M;
s6: calculating to obtain a current output data value tested by the temperature sensor according to a formula A, namely N + G (N-M), and recording the current output data value into the data space in the step S1;
s7: after step S6 is completed, an average value in the data space is calculated, and then an actual temperature value of the temperature measured by the temperature sensor at the current time is calculated by using a formula T ═ PTAT ═ PTATgr + PTAToff, where PTATgr represents a gain coefficient of the temperature sensor, and PTAToff represents a reduction coefficient of the temperature sensor.
2. The algorithm according to claim 1, wherein the step S1 further comprises:
the temperature sensor reads data values corresponding to the number of data spaces and records the plurality of data values into the data spaces.
3. The algorithm of claim 1, wherein the data space has 32.
4. The algorithm according to claim 1, wherein the step S4 further comprises: and reading the temperature data value tested by the temperature sensor at the current time, comparing the temperature data value with the last data value of the current time, and discarding the temperature data value tested at the current time if the difference value between the two data values exceeds the measurement error value.
5. The algorithm according to claim 1, wherein the step S6 further comprises the steps of:
s6.1: removing data PTAT when a plurality of said data space records are full1And the value is used for storing the current output data value tested by the temperature sensor.
6. The algorithm according to claim 4, wherein the step S6 further comprises the steps of:
s6.2: after the output data value is tested by the temperature sensor at the current time and recorded into the data space in step S1, the fourth difference is calculated and obtained according to the data group in the current data space, and is recorded as PiAnd P isi＝(1-G)*p。
7. The algorithm according to claim 4, wherein the step S7 is further followed by the steps of:
s8: and 4, calculating the actual temperature value of the temperature sensor for temperature test through steps 4 to 7 every time the temperature sensor performs temperature test.
8. A system for stabilizing temperature measurement value of a temperature sensor is characterized by comprising
The temperature acquisition module is used for acquiring a measured temperature value of an object; the conversion module is used for carrying out analog-to-digital conversion on the measurement temperature value acquired by the temperature acquisition module; the storage module is used for storing the digitized measured temperature value processed by the conversion module, the storage module specifically comprises a plurality of data spaces and sequences the data spaces in sequence, and the data value in the data space is recorded as PTAT1～PTATn：
A calculation module, configured to calculate actual measurement values of measurement gain, variance, and temperature of data recorded in the storage module, where the calculation module specifically includes: reading the data tested by the temperature sensor and recording the data as N, reading the data tested by the temperature sensor at the previous time and recording the data as M; calculating to obtain a current output data value tested by the temperature sensor according to a formula A (N + G) (N-M), and recording the current output data value into a storage module; in addition, an average value in the data space is calculated, and then an actual temperature value of the temperature measured by the temperature sensor at the current time is calculated through a formula T ═ PTAT (PTATGr + PTATaff), wherein PTATGr represents a gain coefficient of the temperature sensor, and PTATaff represents a reduction coefficient of the temperature sensor;
and the temperature display module is used for displaying the actual value of the temperature of the object by the temperature acquisition module.
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