CN108362355B - Liquid level measurement method and device based on segmented capacitor and electronic equipment - Google Patents
Liquid level measurement method and device based on segmented capacitor and electronic equipment Download PDFInfo
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- CN108362355B CN108362355B CN201711363690.7A CN201711363690A CN108362355B CN 108362355 B CN108362355 B CN 108362355B CN 201711363690 A CN201711363690 A CN 201711363690A CN 108362355 B CN108362355 B CN 108362355B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
Abstract
The invention provides a liquid level measuring method and device based on a segmented capacitor and electronic equipment, and belongs to the field of liquid level measurement. The measurement method comprises the following steps: acquiring current voltage information, wherein the voltage information comprises a triangular wave voltage value and a linear voltage value; determining the liquid level height corresponding to the obtained linear voltage value according to the corresponding relation between the preset linear voltage and the liquid level height; judging the number of sections of the section unit where the current liquid level is located according to the determined liquid level height; determining the height of the current liquid level in the section unit according to the triangular wave voltage value; and determining the liquid level height according to the number of the sections of the section unit and the height in the section unit. The method realizes high-precision measurement of the low-temperature liquid level under the condition of severe shaking, and meets the measurement requirement of the low-temperature liquid level during rocket flying.
Description
Technical Field
The invention relates to a liquid level measuring method and device based on a segmented capacitor and electronic equipment, and belongs to the field of liquid level measurement.
Background
The low-temperature oxyhydrogen propellant is mostly adopted by aircrafts such as new-generation carrier rockets in China, and the effective utilization of the propellant influences the orbit-entering precision of the aircrafts. For the utilization of the low-temperature propellant of the aircraft, the low-temperature liquid level is the most important measurement parameter and is the basis for calculation and regulation of the propellant in the flight process. Aiming at the characteristics of large measuring range, high precision, fast liquid level change and liquid level shaking of low-temperature liquid level measurement, the existing measuring technology adopts a segmented capacitance liquid level sensor and is equipped with corresponding signal conversion equipment to output multi-valued triangular wave voltage to realize the liquid level measurement.
The segmented capacitive sensor adopts a connection mode of three electrodes of an odd capacitor a, an even capacitor b and a common end c, as shown in fig. 1, the segmented capacitive sensor comprises an even number of segmented units, and the segmented units are sequentially arranged, wherein the segmented units at odd number positions are odd capacitors, the segmented units at even number positions are even capacitors, the odd capacitors are connected in series, and the even capacitors are connected in series. When the sensor is used, the odd-even capacitor is used as an outer electrode, the common terminal is used as an inner electrode, and the capacitance change condition between the outer electrode and the inner electrode is the measured value of the sensor. When the liquid level between the odd-even capacitance and the common end of the sensor changes, the dielectric constant of the measuring medium changes, and the capacitance output by the sensor changes, so that the liquid level is measured.
According to the characteristics of the segmented capacitance sensor, when the liquid level rises or falls, the odd-even capacitance segmented units alternately contact with the medium, and the capacitance of the odd-even capacitance segmented units alternately changes. The output signal of the sensor passes through a signal conversion device, the odd-even capacitance difference value generates output voltage with triangular wave characteristics, and then the liquid level height is calculated according to the triangular wave output voltage. Specifically, the subsection unit where the current liquid level is located is determined according to the number of the voltage triangular waves, and then the specific position of the current liquid level in the subsection unit is determined according to the voltage value, so that the height of the current liquid level is obtained. The liquid level measuring method is characterized in that each sensing subsection unit corresponds to the full-scale output of the triangular wave voltage, the measuring resolution is improved, meanwhile, the triangular wave voltage output corresponds to the difference value of the odd-even capacitance, the influence of medium temperature change and the system error of the sensor are eliminated, and the measuring precision is improved.
With the development of a new generation of carrier rocket, the environment of low-temperature liquid level measurement is more complex, the rocket body is impacted in the flying process to cause the liquid level to shake violently, the sensor senses the false triangular wave output by the shaking liquid level, the triangular wave liquid level measurement method cannot distinguish whether the true triangular wave or the triangular wave formed by the liquid level shaking, the judgment of the number of the triangular waves is wrong, and the liquid level height measurement cannot be realized.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the liquid level measuring method, the liquid level measuring device and the electronic equipment based on the segmented capacitor overcome the defects of the prior art, realize high-precision measurement of the low-temperature liquid level under the condition of severe shaking, and meet the measurement requirement of the low-temperature liquid level during rocket flying.
In order to achieve the purpose, the invention adopts the following technical scheme:
a liquid level measuring method based on a segmented capacitor comprises the following steps:
acquiring current voltage information, wherein the voltage information comprises a triangular wave voltage value and a linear voltage value;
determining the liquid level height corresponding to the obtained linear voltage value according to the corresponding relation between the preset linear voltage and the liquid level height;
judging the number of sections of the section unit where the current liquid level is located according to the determined liquid level height;
determining the height of the current liquid level in the section unit according to the triangular wave voltage value;
and determining the liquid level height according to the number of the sections of the section unit and the height in the section unit.
In an optional embodiment, before the obtaining the current voltage information, the method further includes:
obtaining triangular wave voltage values of a plurality of time points, and fitting the triangular wave voltage values into a linear equation of the triangular wave voltage and time;
and judging the number of the sections of the section unit corresponding to the initial position of the liquid level according to the slope of the fitted linear equation and the number of the sections of the preset section unit.
In an optional embodiment, the determining the number of nodes of the segmentation unit corresponding to the initial position of the liquid level according to the slope of the fitted linear equation and the number of nodes of the preset segmentation unit includes:
when the slope of the fitted linear equation is greater than 0 and the number of the sections of the preset section unit is an even number, taking the number of the sections of the section unit as the number of the sections of the section unit corresponding to the initial position of the liquid level;
and when the slope of the fitted linear equation is greater than 0 and the number of the preset subsection units is odd, subtracting 1 from the number of the sections of the subsection units to be used as the number of the sections of the subsection units corresponding to the initial position of the liquid level.
In an alternative embodiment, the linear voltage to liquid level height correspondence comprises a linear voltage to liquid level height equation of the first degree.
In an optional embodiment, after determining the liquid level height, the method further includes: and correcting the slope of a linear equation of the linear voltage and the liquid level height according to the determined liquid level height and the corresponding linear voltage value, so that the corrected linear equation is used as the corresponding relation of the preset linear voltage and the liquid level height.
In an optional embodiment, the liquid level measuring method based on the segmented capacitance further includes:
and when the preset height is reached, acquiring a current linear voltage value, and correcting the slope of a linear equation of the linear voltage and the liquid level height according to the preset height and the current linear voltage value so as to take the corrected linear equation as the corresponding relation of the preset linear voltage and the liquid level height.
In an optional embodiment, the liquid level measuring method based on the segmented capacitance further includes:
and when the acquired triangular wave voltage value is unchanged within a certain time period, determining that the preset height is reached.
A segmented capacitance-based liquid level measurement device, comprising:
the voltage information acquisition module is used for acquiring current voltage information, and the voltage information comprises a triangular wave voltage value and a linear voltage value;
the first determining module is used for determining the liquid level height corresponding to the obtained linear voltage value according to the corresponding relation between the preset linear voltage and the liquid level height;
the first judgment module is used for judging the number of sections of the section unit where the current liquid level is located according to the determined liquid level height;
the second determining module is used for determining the height of the current liquid level in the section unit according to the triangular wave voltage value;
and the third determining module is used for determining the liquid level height according to the number of the sections of the section unit and the height in the section unit.
In an optional embodiment, the segmented capacitance-based liquid level measuring device further includes:
the linear equation determining module is used for obtaining triangular wave voltage values of a plurality of time points and fitting the triangular wave voltage values and the time values into a linear equation of the triangular wave voltage values and the time;
and the second judging module is used for judging the node number of the subsection unit corresponding to the initial position of the liquid level according to the slope of the fitted linear equation and the node number of the preset subsection unit.
In an optional embodiment, the second determining module is configured to:
when the slope of the fitted linear equation is greater than 0 and the number of the sections of the preset section unit is an even number, taking the number of the sections of the section unit as the number of the sections of the section unit corresponding to the initial position of the liquid level;
and when the slope of the fitted linear equation is greater than 0 and the number of the preset subsection units is odd, subtracting 1 from the number of the sections of the subsection units to be used as the number of the sections of the subsection units corresponding to the initial position of the liquid level.
In an alternative embodiment, the linear voltage to liquid level height correspondence comprises a linear voltage to liquid level height equation of the first degree.
In an optional embodiment, the liquid level measuring device based on the segmented capacitor further includes a first correction module, configured to correct a slope of a linear equation between the linear voltage and the liquid level height according to the determined liquid level height and the corresponding linear voltage value, so as to use the corrected linear equation as a preset corresponding relationship between the linear voltage and the liquid level height.
In an optional embodiment, the segmented capacitance-based liquid level measuring apparatus further includes a second correction module, configured to:
and when the preset height is reached, acquiring a current linear voltage value, and correcting the slope of a linear equation of the linear voltage and the liquid level height according to the preset height and the current linear voltage value so as to take the corrected linear equation as the corresponding relation of the preset linear voltage and the liquid level height.
In an optional embodiment, the segmented capacitance-based liquid level measuring apparatus further includes a fourth determining module, configured to:
and when the acquired triangular wave voltage value is unchanged within a certain time period, determining that the preset height is reached.
An electronic device comprising a memory and a processor, the memory for storing one or more computer instructions;
the processor is to execute the one or more computer instructions to: acquiring current voltage information, wherein the voltage information comprises a triangular wave voltage value and a linear voltage value;
determining the liquid level height corresponding to the obtained linear voltage value according to the corresponding relation between the preset linear voltage and the liquid level height;
judging the number of sections of the section unit where the current liquid level is located according to the determined liquid level height;
determining the height of the current liquid level in the section unit according to the triangular wave voltage value;
and determining the liquid level height according to the number of the sections of the section unit and the height in the section unit.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the liquid level measuring method based on the segmented capacitor, the number of the segmented units where the current liquid level is located is determined according to the corresponding relation between the linear voltage and the liquid level height, the height of the current liquid level in the current segmented units is determined according to the triangular wave voltage value, the liquid level height can be determined without utilizing the triangular wave number, and the problem that liquid level height measurement cannot be achieved due to the fact that the triangular wave number is judged incorrectly is solved;
(2) the number of the sections of the section unit where the initial position of the liquid level is located can be accurately determined, and the problems that the number of the sections of the section unit where the initial position of the liquid level is located cannot be accurately given, and liquid level measurement cannot be carried out only when the number of the sections of the section unit is within the range of a certain two-section unit are solved;
(3) the preset linear voltage and the preset linear equation of the liquid level height are corrected by adopting the determined liquid level height and the corresponding linear voltage value, so that the calculation error of the section number of the section unit caused by the influence of medium temperature and pressure is avoided;
(4) when the linear voltage at different liquid level heights is inconsistent with the linear relation of the liquid level heights, the slope of the linear equation is corrected at the preset height, so that the measurement error caused by inconsistent slopes can be avoided, and the measurement accuracy is improved.
Drawings
FIG. 1 is a schematic view of a segmented capacitive sensor;
FIG. 2 is a flow chart of a liquid level measuring method based on a segmented capacitor according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a liquid level measuring device based on a segmented capacitor according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 and 2, an embodiment of the present invention provides a liquid level measurement method based on a segmented capacitor, including:
step 101: acquiring current voltage information, wherein the voltage information comprises a triangular wave voltage value and a linear voltage value;
specifically, in the embodiment of the present invention, the triangular wave voltage value is an output voltage value corresponding to a difference value between an odd capacitor and an even capacitor; the linear voltage value is an output voltage value corresponding to the sum of the odd capacitor and the even capacitor;
step 102: determining the liquid level height corresponding to the obtained linear voltage value according to the corresponding relation between the preset linear voltage and the liquid level height;
specifically, in an optional embodiment, the corresponding relationship between the linear voltage and the liquid level height may be determined by performing least square fitting on the actually measured voltage and the corresponding liquid level height, and in other embodiments, the corresponding relationship may be determined by a lagrange interpolation method, a newton interpolation method, an interval interpolation method, or the like, which is not limited in the present invention;
step 103: judging the number of sections of the section unit where the current liquid level is located according to the determined liquid level height;
specifically, the height of a single section unit is determined, and after the liquid level height is preliminarily determined, the number of sections of the section unit where the current liquid level is located can be determined;
step 104: determining the height of the current liquid level in the section unit according to the triangular wave voltage value;
step 105: and determining the liquid level height according to the number of the sections of the section unit and the height in the section unit.
Specifically, in an optional embodiment, after the sensor is installed, the lowermost section of the section unit is taken as a first section, and the number of the sections is sequentially increased upwards, and at this time, no matter the liquid level rises or falls, the calculation formula of the liquid level height is:
when the liquid level is at an odd number of segmented units, determining the liquid level height according to equation (1):
when the liquid level is at an even number of segmental units, the liquid level height is determined according to equation (2):
h: the liquid level height; n: the number of sections of the section unit where the current liquid level is located; v: the current triangular wave voltage value; vH: the maximum voltage value of the triangular wave; vL: a triangular wave minimum voltage value; l is the length of the single-segment unit.
During calculation processing, judging the maximum value and the minimum value of the triangular wave according to the fitting slope of the triangular wave voltage and the threshold voltage; when the slope is changed from a positive value to a negative value and the triangular wave voltage is greater than the upper limit threshold voltage, recording the maximum voltage value of the triangular wave; and when the slope is changed from a negative value to a positive value and the triangular wave sampling voltage is less than the lower threshold value voltage, recording the minimum voltage value of the triangular wave. By using the maximum and minimum triangular wave voltages of adjacent sections, the calculation error of the liquid level height can be reduced.
According to the liquid level measuring method based on the segmented capacitor, the number of the segmented units where the current liquid level is located is determined according to the corresponding relation between the linear voltage and the liquid level height, the height of the current liquid level in the current segmented units is determined according to the triangular wave voltage, the liquid level height can be determined without utilizing the triangular wave number, and the problem that liquid level height measurement cannot be achieved due to the fact that the triangular wave number is judged incorrectly is solved.
Further, before the obtaining of the current voltage information, the method further includes:
obtaining triangular wave voltage values of a plurality of time points, and fitting the triangular wave voltage values into a linear equation of the triangular wave voltage and time;
and judging the number of the sections of the section unit corresponding to the initial position of the liquid level according to the slope of the fitted linear equation and the number of the sections of the preset section unit.
The method can accurately determine the number of the sections of the section unit where the initial position of the liquid level is located, and solves the problems that the number of the sections of the section unit where the initial position of the liquid level is located cannot be accurately given, and liquid level measurement cannot be carried out only when the number of the sections of the section unit is within the range of a certain two-section unit.
Specifically, the determining the number of nodes of the segmentation unit corresponding to the initial position of the liquid level according to the slope of the fitted linear equation and the number of nodes of the preset segmentation unit includes:
when the slope of the fitted linear equation is greater than 0 and the number of the sections of the preset section unit is an even number, taking the number of the sections of the section unit as the number of the sections of the section unit corresponding to the initial position of the liquid level; presetting the number of sections of the section unit, for example, the number of sections of the section unit where the rocket is located at the liquid level initial position bound in advance;
when the slope of the fitted linear equation is greater than 0 and the number of the preset subsection units is odd, subtracting 1 from the number of the subsection units to serve as the number of the subsection units corresponding to the initial position of the liquid level;
when the slope of the fitted linear equation is less than 0 and the number of the preset subsection units is odd, taking the number of the subsection units as the number of the subsection units corresponding to the initial position of the liquid level;
and when the slope of the fitted linear equation is less than 0 and the number of the sections of the preset section unit is an even number, subtracting 1 from the number of the sections of the section unit to be used as the number of the sections of the section unit corresponding to the initial position of the liquid level.
In an optional embodiment, the linear voltage and liquid level height correspondence comprises a linear equation of the first order of the linear voltage and the liquid level height; after the liquid level height is determined, the method further comprises the following steps: and correcting the slope of a linear equation of the linear voltage and the liquid level height according to the determined liquid level height and the corresponding linear voltage value, so that the corrected linear equation is used as the corresponding relation of the preset linear voltage and the liquid level height.
The linear equation of the preset linear voltage and the liquid level height is corrected by adopting the determined liquid level height and the corresponding linear voltage value, so that the calculation error of the section unit section number caused by the influence of medium temperature and pressure is avoided.
Further, the liquid level measuring method based on the segmented capacitance further comprises the following steps:
and when the preset height is reached, acquiring a current linear voltage value, and correcting the slope of a linear equation of the linear voltage and the liquid level height according to the preset height and the current linear voltage value so as to take the corrected linear equation as the corresponding relation of the preset linear voltage and the liquid level height.
When the linear voltage at different liquid level heights is inconsistent with the linear relation of the liquid level heights, the slope of the linear equation is corrected at the preset height, so that the measurement error caused by inconsistent slopes can be avoided, and the measurement accuracy is improved.
In an optional embodiment, because the rocket liquid hydrogen and liquid oxygen storage tanks are long, the sensor for liquid level measurement is formed by connecting a plurality of sectional capacitance sensors in series, the height of each sectional capacitance sensor is constant, a gap can be reserved between the two adjacent sectional capacitance sensors, the preset height can be determined according to the height of each sectional capacitance sensor and the width of the gap, and at the moment, when the obtained triangular wave voltage value is constant within a certain time period, the preset height is determined to be reached.
Referring to fig. 3, an embodiment of the present invention further provides a liquid level measuring device based on a segmented capacitor, including:
the voltage information acquiring module 10 is configured to acquire current voltage information, where the voltage information includes a triangular wave voltage value and a linear voltage value;
the first determining module 20 is configured to determine a liquid level height corresponding to the obtained linear voltage value according to a preset corresponding relationship between the linear voltage and the liquid level height;
the first judging module 30 is used for judging the number of the sections of the section unit where the current liquid level is located according to the determined liquid level height;
the second determining module 40 is used for determining the height of the current liquid level in the section unit according to the triangular wave voltage value;
and a third determining module 50, configured to determine the liquid level height according to the number of the sections of the section unit and the height in the section unit.
In an optional embodiment, the segmented capacitance-based liquid level measuring device further includes:
the linear equation determining module is used for obtaining triangular wave voltage values of a plurality of time points and fitting the triangular wave voltage values and the time values into a linear equation of the triangular wave voltage values and the time;
and the second judging module is used for judging the node number of the subsection unit corresponding to the initial position of the liquid level according to the slope of the fitted linear equation and the node number of the preset subsection unit.
In an optional embodiment, the second determining module is configured to:
when the slope of the fitted linear equation is greater than 0 and the number of the sections of the preset section unit is an even number, taking the number of the sections of the section unit as the number of the sections of the section unit corresponding to the initial position of the liquid level;
and when the slope of the fitted linear equation is greater than 0 and the number of the preset subsection units is odd, subtracting 1 from the number of the sections of the subsection units to be used as the number of the sections of the subsection units corresponding to the initial position of the liquid level.
In an alternative embodiment, the linear voltage to liquid level height correspondence comprises a linear voltage to liquid level height equation of the first degree.
In an optional embodiment, the liquid level measuring device based on the segmented capacitor further includes a first correction module, configured to correct a slope of a linear equation between the linear voltage and the liquid level height according to the determined liquid level height and the corresponding linear voltage value, so as to use the corrected linear equation as a preset corresponding relationship between the linear voltage and the liquid level height.
In an optional embodiment, the segmented capacitance-based liquid level measuring apparatus further includes a second correction module, configured to:
and when the preset height is reached, acquiring a current linear voltage value, and correcting the slope of a linear equation of the linear voltage and the liquid level height according to the preset height and the current linear voltage value so as to take the corrected linear equation as the corresponding relation of the preset linear voltage and the liquid level height.
In an optional embodiment, the segmented capacitance-based liquid level measuring apparatus further includes a fourth determining module, configured to:
and when the acquired triangular wave voltage value is unchanged within a certain time period, determining that the preset height is reached.
The device embodiments and the method embodiments of the present invention correspond to one another, have the beneficial effects of the method embodiments, and for the specific description, reference is made to the method embodiments, which are not repeated herein.
An electronic device comprising a memory and a processor, the memory for storing one or more computer instructions;
the processor is to execute the one or more computer instructions to: acquiring current voltage information, wherein the voltage information comprises a triangular wave voltage value and a linear voltage value;
determining the liquid level height corresponding to the obtained linear voltage value according to the corresponding relation between the preset linear voltage and the liquid level height;
judging the number of sections of the section unit where the current liquid level is located according to the determined liquid level height;
determining the height of the current liquid level in the section unit according to the triangular wave voltage value;
and determining the liquid level height according to the number of the sections of the section unit and the height in the section unit.
The embodiments of the electronic device and the embodiments of the method of the present invention correspond to each other one to one, and have the advantages of the embodiments of the method.
The liquid level processing equipment realized according to the method is adopted for the first time on a certain type rocket in China, and engine test shows that the calculation precision of the liquid level height of the triangular wave linear section can reach 2mm, the index requirement of a task is met, and the effective regulation and utilization of the low-temperature propellant are effectively guaranteed.
The invention has not been described in detail in part of the common general knowledge of those skilled in the art. The specific embodiments described are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (13)
1. A liquid level measuring method based on a segmented capacitor is characterized by comprising the following steps:
obtaining triangular wave voltage values of a plurality of time points, and fitting the triangular wave voltage values into a linear equation of the triangular wave voltage and time;
judging the number of the sections of the section unit corresponding to the initial position of the liquid level according to the slope of the fitted linear equation and the number of the sections of the preset section unit;
acquiring current voltage information, wherein the voltage information comprises a triangular wave voltage value and a linear voltage value;
determining the liquid level height corresponding to the obtained linear voltage value according to the corresponding relation between the preset linear voltage and the liquid level height;
judging the number of sections of the section unit where the current liquid level is located according to the determined liquid level height;
determining the height of the current liquid level in the section unit according to the triangular wave voltage value;
and determining the liquid level height according to the number of the sections of the section unit and the height in the section unit.
2. The segmented capacitance-based liquid level measurement method according to claim 1, wherein the step of judging the number of the segments of the segmented unit corresponding to the initial position of the liquid level according to the slope of the fitted linear equation and the number of the segments of the preset segmented unit comprises the following steps:
when the slope of the fitted linear equation is greater than 0 and the number of the sections of the preset section unit is an even number, taking the number of the sections of the section unit as the number of the sections of the section unit corresponding to the initial position of the liquid level;
and when the slope of the fitted linear equation is greater than 0 and the number of the preset subsection units is odd, subtracting 1 from the number of the sections of the subsection units to be used as the number of the sections of the subsection units corresponding to the initial position of the liquid level.
3. The segmented capacitance-based liquid level measurement method according to claim 1, wherein the linear voltage to liquid level height correspondence comprises a linear equation of the first order of linear voltage to liquid level height.
4. The segmented capacitance-based liquid level measurement method according to claim 3, wherein after determining the liquid level height, further comprising: and correcting the slope of a linear equation of the linear voltage and the liquid level height according to the determined liquid level height and the corresponding linear voltage value, so that the corrected linear equation is used as the corresponding relation of the preset linear voltage and the liquid level height.
5. The segmented capacitance-based liquid level measurement method according to claim 3, further comprising:
and when the preset height is reached, acquiring a current linear voltage value, and correcting the slope of a linear equation of the linear voltage and the liquid level height according to the preset height and the current linear voltage value so as to take the corrected linear equation as the corresponding relation of the preset linear voltage and the liquid level height.
6. The segmented capacitance-based liquid level measurement method according to claim 5, further comprising:
and when the acquired triangular wave voltage value is unchanged within a certain time period, determining that the preset height is reached.
7. A liquid level measuring device based on a segmented capacitor is characterized by comprising:
the voltage information acquisition module is used for acquiring current voltage information, and the voltage information comprises a triangular wave voltage value and a linear voltage value;
the first determining module is used for determining the liquid level height corresponding to the obtained linear voltage value according to the corresponding relation between the preset linear voltage and the liquid level height;
the first judgment module is used for judging the number of sections of the section unit where the current liquid level is located according to the determined liquid level height;
the second determining module is used for determining the height of the current liquid level in the section unit according to the triangular wave voltage value;
the third determining module is used for determining the liquid level height according to the number of the sections of the section unit and the height in the section unit;
the linear equation determining module is used for obtaining triangular wave voltage values of a plurality of time points and fitting the triangular wave voltage values and the time values into a linear equation of the triangular wave voltage values and the time;
and the second judging module is used for judging the node number of the subsection unit corresponding to the initial position of the liquid level according to the slope of the fitted linear equation and the node number of the preset subsection unit.
8. The segmented capacitance-based liquid level measuring device according to claim 7, wherein the second judging module is configured to:
when the slope of the fitted linear equation is greater than 0 and the number of the sections of the preset section unit is an even number, taking the number of the sections of the section unit as the number of the sections of the section unit corresponding to the initial position of the liquid level;
and when the slope of the fitted linear equation is greater than 0 and the number of the preset subsection units is odd, subtracting 1 from the number of the sections of the subsection units to be used as the number of the sections of the subsection units corresponding to the initial position of the liquid level.
9. The segmented capacitance-based liquid level measuring device of claim 7, wherein the linear voltage to liquid level height correspondence comprises a linear equation of the first order of linear voltage to liquid level height.
10. The segmented capacitance-based liquid level measurement device of claim 9, further comprising a first correction module configured to:
and correcting the slope of a linear equation of the linear voltage and the liquid level height according to the determined liquid level height and the corresponding linear voltage value, so that the corrected linear equation is used as the corresponding relation of the preset linear voltage and the liquid level height.
11. The segmented capacitance-based liquid level measurement device of claim 9, further comprising a second correction module for:
and when the preset height is reached, acquiring a current linear voltage value, and correcting the slope of a linear equation of the linear voltage and the liquid level height according to the preset height and the current linear voltage value so as to take the corrected linear equation as the corresponding relation of the preset linear voltage and the liquid level height.
12. The segmented capacitance-based liquid level measurement device of claim 11, further comprising a fourth determination module configured to:
and when the acquired triangular wave voltage value is unchanged within a certain time period, determining that the preset height is reached.
13. An electronic device comprising a memory and a processor, wherein the memory is configured to store one or more computer instructions;
the processor is to execute the one or more computer instructions to:
obtaining triangular wave voltage values of a plurality of time points, and fitting the triangular wave voltage values into a linear equation of the triangular wave voltage and time;
judging the number of the sections of the section unit corresponding to the initial position of the liquid level according to the slope of the fitted linear equation and the number of the sections of the preset section unit;
acquiring current voltage information, wherein the voltage information comprises a triangular wave voltage value and a linear voltage value;
determining the liquid level height corresponding to the obtained linear voltage value according to the corresponding relation between the preset linear voltage and the liquid level height;
judging the number of sections of the section unit where the current liquid level is located according to the determined liquid level height;
determining the height of the current liquid level in the section unit according to the triangular wave voltage value;
and determining the liquid level height according to the number of the sections of the section unit and the height in the section unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711363690.7A CN108362355B (en) | 2017-12-18 | 2017-12-18 | Liquid level measurement method and device based on segmented capacitor and electronic equipment |
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| CN112649065A (en) * | 2020-12-22 | 2021-04-13 | 上海海能信息科技有限公司 | Method and device for acquiring liquid level value based on metallurgical eddy current liquid level signal |
| CN112798077B (en) * | 2020-12-29 | 2023-04-07 | 北京金迈捷科技股份有限公司 | Liquid level height analysis method, device, equipment, storage medium and system |
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| CN102128662A (en) * | 2010-12-31 | 2011-07-20 | 北京遥测技术研究所 | Segmental capacitor type continuous liquid level sensor |
| CN103575360A (en) * | 2012-07-19 | 2014-02-12 | 北京航天试验技术研究所 | Circuit measuring achieving method for segmentation capacitor liquid level sensor |
| CN106289451A (en) * | 2016-07-27 | 2017-01-04 | 上海航天设备制造总厂 | Merogenesis condenser type Low Temperature Liquid bit changer |
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| CN102128662A (en) * | 2010-12-31 | 2011-07-20 | 北京遥测技术研究所 | Segmental capacitor type continuous liquid level sensor |
| CN103575360A (en) * | 2012-07-19 | 2014-02-12 | 北京航天试验技术研究所 | Circuit measuring achieving method for segmentation capacitor liquid level sensor |
| CN106289451A (en) * | 2016-07-27 | 2017-01-04 | 上海航天设备制造总厂 | Merogenesis condenser type Low Temperature Liquid bit changer |
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