CN111854890B - Liquid level position detection device, equipment and water supply equipment - Google Patents
Liquid level position detection device, equipment and water supply equipment Download PDFInfo
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- CN111854890B CN111854890B CN201910363139.5A CN201910363139A CN111854890B CN 111854890 B CN111854890 B CN 111854890B CN 201910363139 A CN201910363139 A CN 201910363139A CN 111854890 B CN111854890 B CN 111854890B
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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
- G01F23/28—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 the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D9/00—Level control, e.g. controlling quantity of material stored in vessel
Abstract
The invention provides a liquid level position detection device, equipment and water supply equipment, wherein the liquid level position detection device comprises: an ultrasonic transmitter for transmitting an ultrasonic signal to an opening of a target container; the ultrasonic receiver is used for acquiring a reflected first echo signal; the processing unit is used for confirming a wave crest corresponding to the opening of the target container in the first echo signal, and comparing the wave crest corresponding to the opening of the target container with a wave crest obtained at any time within a preset time length; confirming that the liquid level of the liquid in the target container reaches the opening of the target container. The embodiment of the invention solves the technical problem of low precision of the liquid level detection technology in the prior art, and has the beneficial effect of accurately detecting the liquid level.
Description
Technical Field
The embodiment of the invention relates to the technical field of liquid, in particular to a liquid level position detection device, liquid level position detection equipment and water supply equipment.
Background
The liquid level position refers to the height of the liquid level in the open container (water tank). In daily life and industrial production and operation, the position of the liquid level in the container is required to be known frequently.
The technology is developed today, and mankind invents countless liquid level position measuring methods, from old scales to modern floating ball, ultrasonic wave, reed pipe and photoelectric water level sensor. The liquid level position is now a good handle in the fields of domestic electrical appliances, petrochemical industry, metallurgy, electric power, pharmacy, water supply and drainage, environmental protection and the like, and plays an important role in various scientific and technological fields.
In the prior art, an ultrasonic sensor is usually adopted to detect a liquid level signal in a container, and when the container is placed on a table top, if the waveform of an echo generated by the liquid level in the container is similar to that of an echo generated by an opening of the container, the two waveforms are easy to mix together and are not easy to distinguish.
Therefore, the liquid level position in the prior art has the problem of low recognition accuracy.
Disclosure of Invention
The embodiment of the invention provides a liquid level position detection device, liquid level position detection equipment and water supply equipment, which are used for solving the technical problems of low precision and high cost of a liquid level position detection technology in the prior art.
According to a first aspect of embodiments of the present invention, there is provided a liquid level position detection device including:
an ultrasonic transmitter for transmitting an ultrasonic signal to an opening of a target container;
the ultrasonic receiver is used for acquiring a reflected first echo signal;
the processing unit is used for confirming a wave crest corresponding to the opening of the target container in the first echo signal, and comparing the wave crest corresponding to the opening of the target container with a wave crest obtained at any time within a preset time length; confirming that the liquid level of the liquid in the target container reaches the opening of the target container.
Further, the processing unit is further configured to:
confirming a wave crest corresponding to the opening of the target container in the first echo signal, wherein the wave crest corresponding to the opening of the target container is unchanged compared with a wave crest obtained at any time within a preset time length; and confirming that the liquid level of the liquid in the target container does not reach the opening of the target container.
Further, the processing unit is further configured to:
after the liquid level of the liquid in the target container is confirmed to not reach the opening of the target container, confirming a wave crest corresponding to the liquid level of the liquid in the target container in the first echo signal;
confirming that the time interval T between the acquisition time of the wave crest corresponding to the liquid level of the liquid in the target container in the first echo signal and the acquisition time of the wave crest corresponding to the opening of the target container in the first echo signal is smaller than or equal to tm; tm is a preset time length threshold;
confirming that the liquid level of the liquid in the target container reaches the opening of the target container.
Further, the processing unit is further configured to:
after the liquid level of the liquid in the target container is confirmed to not reach the opening of the target container, confirming a wave crest corresponding to the liquid level of the liquid in the target container in the first echo signal;
confirming that the time interval T between the acquisition time of the wave crest corresponding to the liquid level of the liquid in the target container in the first echo signal and the acquisition time of the wave crest corresponding to the opening of the target container in the first echo signal is larger than tm; tm is a preset time length threshold;
and confirming that the liquid level of the liquid in the target container does not reach the opening of the target container.
Further, the processing unit is further configured to: obtaining ultrasonic information from the beginningTime interval t to the moment of acquisition of the peak of the first echo signal corresponding to the opening of the target containera(ii) a Confirmation of | ta’-taIf the l is larger than the preset threshold value, the liquid level of the liquid in the target container is confirmed to reach the opening of the target container; wherein, taThe time interval from the beginning of sending the ultrasonic signal to the acquisition time of the wave crest corresponding to the opening of the target container in the second echo signal at any time within the preset time length; or the like, or, alternatively,
obtaining a level value e of a peak corresponding to the opening of the target container in the first echo signala(ii) a Confirmation | ea-eaIf the' l is larger than the preset threshold value, the liquid level of the liquid in the target container is confirmed to reach the opening of the target container; wherein e isa' is a level value of a peak corresponding to the opening of the target container in the second echo signal acquired any time within a preset time period.
Further, the processing unit is further configured to:
after the liquid level of the liquid in the target container is confirmed not to reach the opening of the target container, confirming any second wave peak in the first echo signal within a preset time length after the wave peak corresponding to the opening of the target container;
acquiring a time interval t from the start of the emission of the ultrasonic signal to the acquisition time of the second wave peakb(ii) a Confirmation of | tb’-tbIf the l is larger than the preset threshold value, determining that the second peak is the peak corresponding to the liquid level of the liquid in the target container; wherein, tbThe time interval from the start of sending the ultrasonic signal to the acquisition time of a third peak corresponding to the second peak in the second echo signal at any time within the preset time length; or the like, or, alternatively,
obtaining a level value e of a second peakb(ii) a Confirmation | eb-ebIf the' l is larger than the preset threshold value, confirming that the second peak is the peak corresponding to the liquid level of the liquid in the target container; wherein e isb' is a level value of a third peak corresponding to the second peak in the second echo signal acquired any time within a preset time period.
According to a second aspect of the present invention, there is provided an apparatus comprising a liquid level position detection device as defined in any one of the above.
According to a third aspect of the present invention, there is provided a water supply apparatus, comprising any one of the above liquid level position detection devices, and further comprising a water valve for controlling the supply water flow to be turned on and off; the processing unit is in communication connection with the water valve;
and the processing unit is used for controlling the water valve to be closed after confirming that the liquid level of the liquid in the target container reaches the opening of the target container.
The water outlet is connected with a water valve; one of the ultrasonic transmitter and the ultrasonic receiver is arranged at a position close to the water outlet, and the other one is arranged at a position far away from the water outlet.
According to a fourth aspect of the present invention, there is provided a water supply apparatus, comprising the above liquid level position detecting device, further comprising a water valve for controlling the supply water flow to be turned on and off; the processing unit is in communication connection with the water valve;
and the processing unit is used for confirming that T is less than or equal to tm and controlling the water valve to be closed.
The embodiment of the invention provides a liquid level position detection device, equipment and water supply equipment, wherein the liquid level position detection device comprises: an ultrasonic transmitter for transmitting an ultrasonic signal to an opening of a target container; the ultrasonic receiver is used for acquiring a reflected first echo signal; the processing unit is used for confirming a wave crest corresponding to the opening of the target container in the first echo signal, and comparing the wave crest corresponding to the opening of the target container with a wave crest obtained at any time within a preset time length; confirming that the liquid level of the liquid in the target container reaches the opening of the target container. The embodiment of the invention solves the technical problem of low precision of the liquid level detection technology in the prior art, and has the beneficial effect of accurately detecting the liquid level.
Drawings
In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural view of a liquid level position detection device provided in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of another liquid level position detecting device provided in the embodiment of the present invention;
FIG. 3 is a schematic structural diagram of another liquid level position detecting device provided in the embodiment of the present invention;
FIG. 4 is a schematic diagram of an echo waveform of still another liquid level position detecting device according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an ultrasonic waveform and an echo waveform of still another liquid level position detection device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The liquid level position refers to the height of the liquid level in the open container (water tank). In daily life and industrial production and operation, the position of the liquid level in the container is required to be known frequently.
The technology is developed today, and mankind invents countless liquid level position measuring methods, from old scales to modern floating ball, ultrasonic wave, reed pipe and photoelectric water level sensor. The liquid level position is now a good handle in the fields of domestic electrical appliances, petrochemical industry, metallurgy, electric power, pharmacy, water supply and drainage, environmental protection and the like, and plays an important role in various scientific and technological fields.
In the prior art, an ultrasonic sensor is usually adopted to detect a liquid level signal in a container, and when the container is placed on a table top, if the waveform of an echo generated by the liquid level in the container is similar to that of an echo generated by an opening of the container, the two waveforms are easy to mix together and are not easy to distinguish. Therefore, the liquid level position in the prior art has the problem of low recognition accuracy.
In order to solve at least one of the above technical problems, embodiments of the present invention provide a liquid level position detection device, a liquid level position detection apparatus, and a water supply apparatus, where the liquid level position detection device determines a peak corresponding to an opening of a target container in an echo signal, and changes the peak compared to a peak corresponding to the opening of the target container in a previous echo signal; it is confirmed that the liquid level of the liquid in the target container reaches the opening of the target container. The liquid level position detection device solves the technical problem of low precision in the existing liquid level position detection technology, and has the beneficial effect of accurately detecting the liquid level position.
Fig. 1 is a schematic diagram illustrating an overall structure of a liquid level position detecting apparatus according to an embodiment of the present invention, including:
an ultrasonic transmitter a1 for emitting an ultrasonic signal to an opening of a target container;
an ultrasonic receiver a2 for acquiring a reflected first echo signal;
the processing unit a3 is configured to determine a peak corresponding to the opening of the target container in the first echo signal, and compare the peak with a peak corresponding to the opening of the target container in a second echo signal acquired at any time within a preset time period; confirming that the liquid level of the liquid in the target container reaches the opening of the target container; the arrangement positions and angles of the ultrasonic transmitter and the ultrasonic receiver are fixed; the frequency and the intensity of ultrasonic signals sent by the ultrasonic transmitter each time are the same; the placing position and the angle of the target container are fixed.
The ultrasonic transmitter and the ultrasonic receiver can be disposed in the same component, for example, the ultrasonic detection device in the prior art includes both the ultrasonic transmitter and the ultrasonic receiver. The ultrasonic transmitter and the ultrasonic receiver can also be two separate components; when the ultrasonic transmitter and the ultrasonic receiver are two separate members, the ultrasonic transmitter and the ultrasonic receiver may be provided at the same position or may be provided separately at different positions. The embodiment is not particularly limited.
Further, the ultrasonic transmitter is used for sending an ultrasonic signal to the opening of the target container; the ultrasonic signal can be any kind of ultrasonic signal in the prior art as long as the detection of the opening of the target container and the liquid level in the target container can be completed. The frequency and intensity of the ultrasonic signal emitted by the ultrasonic emitter are adjusted according to the requirements of a specific application scene. The embodiment is not particularly limited.
Still further, the ultrasonic receiver is used for acquiring the reflected first echo signal. The signal received by the ultrasonic receiver may include an interference signal, for example, the interference signal is conducted to the ultrasonic signal receiver through a solid medium or other means when the ultrasonic transmitter sends out the ultrasonic signal; and may also include interference signals reflected back from the platform on which the target container is placed. The first echo signal in the embodiment of the invention refers to an echo signal reflected by the ultrasonic signal when the ultrasonic signal meets the target container and the liquid level of the liquid in the target container.
Still further, the processing unit is configured to determine a peak corresponding to the opening of the target container in the first echo signal, and compare the peak with a peak corresponding to the opening of the target container in a second echo signal acquired at any time within a preset time period; it is confirmed that the liquid level of the liquid in the target container reaches the opening of the target container. Since the opening of the target container is closest to the ultrasonic transmitter and the ultrasonic receiver, the first peak in the first echo signal is the peak corresponding to the opening of the target container by default. The arrangement positions and angles of the ultrasonic transmitter and the ultrasonic receiver are fixed; the frequency and the intensity of ultrasonic signals sent by the ultrasonic transmitter every time are the same, and meanwhile, the set position of the target container is also fixed, so that when the liquid level of liquid in the container does not reach the opening of the target container, the wave crests corresponding to the opening of the target container in the echo signals obtained every time are the same, when the wave crests corresponding to the opening of the target container in the current echo signals are judged, compared with the wave crests corresponding to the opening of the target container in the echo signals obtained at any time within the preset time, the wave crests corresponding to the opening of the target container are changed, and the liquid level near the opening of the target container can be confirmed, namely the liquid level of the liquid in the target container reaches the opening of the target container.
And judging the wave crest corresponding to the opening of the target container in the current echo signal, wherein compared with the wave crest obtained at any time within the preset time length, the wave crest corresponding to the opening of the target container has a plurality of changing modes. For example, when the time length from the sending of the ultrasonic signal to the acquisition of the first peak in the echo signal is determined, and the time length variation compared with any time length variation in the previous preset time length exceeds the preset threshold, it is determined that the peak corresponding to the opening of the target container in the current echo signal is changed. For another example, the level value corresponding to the peak corresponding to the opening of the target container in the current echo signal is determined, and when the variation exceeds the preset threshold compared with the level value corresponding to the peak corresponding to the opening of the target container in any echo signal within the previous preset time, it is determined that the peak corresponding to the opening of the target container in the current echo signal is changed.
The embodiment of the invention provides a liquid level position detection device, which confirms the wave crest corresponding to the opening of a target container in an echo signal, and compared with the wave crest corresponding to the opening of the target container in the previous echo signal, the wave crest changes; it is confirmed that the liquid level of the liquid in the target container reaches the opening of the target container. The liquid level position detection device solves the technical problem of low precision in the existing liquid level position detection technology, and has the beneficial effect of accurately detecting the liquid level position.
On the basis of any of the above embodiments of the present invention, there is provided a liquid level position detection device, and the processing unit is further configured to: confirming a wave crest corresponding to the opening of the target container in the first echo signal, wherein the wave crest corresponding to the opening of the target container is unchanged compared with a wave crest obtained at any time within a preset time length; and confirming that the liquid level of the liquid in the target container does not reach the opening of the target container.
Still further, the processing unit is configured to determine a peak corresponding to the opening of the target container in the first echo signal, and compare the peak corresponding to the opening of the target container with a peak corresponding to a second echo signal acquired at any time within a preset time period before, the peak is unchanged. Since the opening of the target container is closest to the ultrasonic transmitter and the ultrasonic receiver, the first peak in the first echo signal is the peak corresponding to the opening of the target container by default. The arrangement positions and angles of the ultrasonic transmitter and the ultrasonic receiver are fixed; the frequency and the intensity of ultrasonic signals sent by the ultrasonic transmitter every time are the same, and meanwhile, the set position of the target container is also fixed, so that when the liquid level of liquid in the container does not reach the opening of the target container, the wave crests corresponding to the opening of the target container in the echo signals obtained every time are the same, when the wave crests corresponding to the opening of the target container in the current echo signals are judged, compared with the wave crests corresponding to the opening of the target container in the echo signals obtained at any time within the preset time, the wave crests corresponding to the opening of the target container are changed, and the liquid level near the opening of the target container can be confirmed, namely the liquid level of the liquid in the target container reaches the opening of the target container.
And judging the wave crest corresponding to the opening of the target container in the current echo signal, wherein compared with the wave crest obtained at any time within the preset time length, the wave crest corresponding to the opening of the target container has a plurality of changing modes. For example, it is determined that the time interval from the sending of the ultrasonic signal to the acquisition of the first peak in the echo signal does not exceed a preset threshold value in comparison with the time interval from the start of the sending of the ultrasonic signal to the acquisition of the peak corresponding to the opening of the target container in the second echo signal at any time within a preset time period, and it is determined that the peak corresponding to the opening of the target container in the current echo signal is changed. For another example, it is determined that the level value corresponding to the peak corresponding to the opening of the target container in the current echo signal does not exceed the level value corresponding to the peak corresponding to the opening of the target container in any echo signal within the previous preset time period by the variation amount, and it is determined that the peak corresponding to the opening of the target container in the current echo signal does not change.
The embodiment of the invention provides a liquid level position detection device, which confirms the wave crest corresponding to the opening of a target container in an echo signal, and compared with the wave crest corresponding to the opening of the target container in the previous echo signal, the wave crest is not changed; it is confirmed that the liquid level of the liquid in the target container does not reach the opening of the target container. The liquid level position detection device solves the technical problem of low precision in the existing liquid level position detection technology, and has the beneficial effect of accurately detecting the liquid level position.
On the basis of any one of the above embodiments of the present invention, there is provided a liquid level detecting apparatus, wherein the processing unit is further configured to:
after the liquid level of the liquid in the target container is confirmed to not reach the opening of the target container, confirming a wave crest corresponding to the liquid level of the liquid in the target container in the first echo signal;
confirming that the time interval T between the acquisition time of the wave crest corresponding to the liquid level of the liquid in the target container in the first echo signal and the acquisition time of the wave crest corresponding to the opening of the target container in the first echo signal is smaller than or equal to tm; tm is a preset time length threshold;
confirming that the liquid level of the liquid in the target container reaches the opening of the target container.
After the liquid level of the liquid in the target container is determined not to reach the opening of the target container, a peak corresponding to the liquid level of the liquid in the target container needs to be searched in the first echo signal. There are many methods for finding the peak corresponding to the liquid level of the liquid in the target container, and it can be determined that the peak in the first echo signal is the peak corresponding to the liquid level of the liquid in the target container by determining that the corresponding peak in the first echo signal changes compared with the corresponding peak in any echo signal within a preset time period. The arrangement positions and angles of the ultrasonic transmitter and the ultrasonic receiver are fixed; the frequency and the intensity of ultrasonic signals sent by the ultrasonic transmitter every time are the same, and meanwhile, the set position of the target container is also fixed, so that when the liquid level of liquid in the container rises continuously, in echo signals acquired every time, the wave crest corresponding to the liquid level of the liquid in the container is changed compared with the wave crest obtained at any time within the preset time length before, and the wave crest corresponding to the liquid level of the liquid can be confirmed to be the wave crest corresponding to the liquid level of the liquid in the container.
Furthermore, the target peak in the current echo signal is judged, and compared with the peak corresponding to the target peak in the echo signal acquired at any time within the preset time length, the target peak has a plurality of changing modes. For example, the time length from sending the ultrasonic signal to acquiring the target peak in the echo signal is determined, and the time length variation of the time interval from starting sending the ultrasonic signal to the acquiring time of the peak corresponding to the target peak in the second echo signal exceeds a preset threshold compared with the time length variation of the time length from sending the ultrasonic signal to acquiring the target peak in the echo signal at any time in the preset time length, so that the target peak in the current echo signal is determined to be changed. For another example, the level value corresponding to the target peak in the current echo signal is determined, and when a variation exceeds a preset threshold compared with the level value corresponding to the target peak in any echo signal within a preset time period, it is determined that the peak corresponding to the opening of the target container in the current echo signal is changed.
Further, it is confirmed that a time interval T between the acquisition time of the peak corresponding to the liquid level of the liquid in the target container in the first echo signal and the acquisition time of the peak corresponding to the opening of the target container in the first echo signal is smaller than or equal to tm. Where tm is a preset duration threshold. tm may be a difference between a time when the liquid level of the target container reaches or is about to reach the opening of the target container, and a time when the liquid level position detection device of the embodiment of the present invention detects a peak corresponding to the opening of the target container, and a time when the liquid level corresponds to the peak. When T is less than or equal to tm, it can be confirmed that the liquid level of the liquid in the target container reaches the opening of the target container.
On the basis of any one of the above embodiments of the present invention, there is provided a liquid level detecting apparatus, wherein the processing unit is further configured to:
after the liquid level of the liquid in the target container is confirmed to not reach the opening of the target container, confirming a wave crest corresponding to the liquid level of the liquid in the target container in the first echo signal;
confirming that the time interval T between the acquisition time of the wave crest corresponding to the liquid level of the liquid in the target container in the first echo signal and the acquisition time of the wave crest corresponding to the opening of the target container in the first echo signal is larger than tm; tm is a preset time length threshold;
and confirming that the liquid level of the liquid in the target container does not reach the opening of the target container.
After the liquid level of the liquid in the target container is determined not to reach the opening of the target container, a peak corresponding to the liquid level of the liquid in the target container needs to be searched in the first echo signal. There are many methods for finding the peak corresponding to the liquid level of the liquid in the target container, and it can be determined that the peak in the first echo signal is the peak corresponding to the liquid level of the liquid in the target container by determining that the corresponding peak in the first echo signal changes compared with the corresponding peak in any echo signal within a preset time period. The arrangement positions and angles of the ultrasonic transmitter and the ultrasonic receiver are fixed; the frequency and the intensity of ultrasonic signals sent by the ultrasonic transmitter every time are the same, and meanwhile, the set position of the target container is also fixed, so that when the liquid level of liquid in the container rises continuously, in echo signals acquired every time, the wave crest corresponding to the liquid level of the liquid in the container is changed compared with the wave crest obtained at any time within the preset time length before, and the wave crest corresponding to the liquid level of the liquid can be confirmed to be the wave crest corresponding to the liquid level of the liquid in the container.
Furthermore, the target peak in the current echo signal is judged, and compared with the peak corresponding to the target peak in the echo signal acquired at any time within the preset time length, the target peak has a plurality of changing modes. For example, the time length from sending the ultrasonic signal to acquiring the target peak in the echo signal is determined, and the time length variation of the time interval from starting sending the ultrasonic signal to the acquiring time of the peak corresponding to the target peak in the second echo signal exceeds a preset threshold compared with the time length variation of the time length from sending the ultrasonic signal to acquiring the target peak in the echo signal at any time in the preset time length, so that the target peak in the current echo signal is determined to be changed. For another example, the level value corresponding to the target peak in the current echo signal is determined, and when a variation exceeds a preset threshold compared with the level value corresponding to the target peak in any echo signal within a preset time period, it is determined that the peak corresponding to the opening of the target container in the current echo signal is changed.
Still further, it is confirmed that a time interval T between the acquisition time of the peak corresponding to the liquid level of the liquid in the target container in the first echo signal and the acquisition time of the peak corresponding to the opening of the target container in the first echo signal is larger than tm. Where tm is a preset duration threshold. tm may be a difference between a time when the liquid level of the target container reaches or is about to reach the opening of the target container, and a time when the liquid level position detection device of the embodiment of the present invention detects a peak corresponding to the opening of the target container, and a time when the liquid level corresponds to the peak. When T is greater than tm, it is confirmed that the liquid level of the liquid in the target container does not reach the opening of the target container.
On the basis of any of the above embodiments of the present invention, there is provided a liquid level position detecting device, wherein the processing unit is further configured to: acquiring a time interval t from the start of the emission of the ultrasonic signal to the acquisition time of the peak corresponding to the opening of the target container in the first ultrasonic signala(ii) a Confirmation of | ta’-taIf the l is larger than the preset threshold value, the liquid level of the liquid in the target container is confirmed to reach the opening of the target container; wherein, ta' is any time within the preset time length; or acquiring the level value e of a peak corresponding to the opening of the target container in the first echo signala(ii) a Confirmation | ea-eaIf the' l is larger than the preset threshold value, the liquid level of the liquid in the target container is confirmed to reach the opening of the target container; wherein e isa' is a level value of a peak corresponding to the opening of the target container in the second echo signal acquired any time within a preset time period.
In this embodiment, two schemes for confirming that the liquid level in the target container reaches the opening of the target container are provided.
Wherein, one scheme is as follows: acquiring a time interval t from the start of the emission of the ultrasonic signal to the acquisition time of the peak corresponding to the opening of the target container in the first ultrasonic signala(ii) a Confirmation of | ta’-taIf the liquid level in the target container reaches the opening of the target container, determining that the liquid level in the target container reaches the preset threshold. The arrangement positions and angles of the ultrasonic transmitter and the ultrasonic receiver are fixed; the frequency and the intensity of ultrasonic signals sent by the ultrasonic transmitter every time are the same, and meanwhile, the set position of the target container is also fixed, so when the liquid level of liquid in the container does not reach the opening of the target container, the acquisition duration of a wave peak corresponding to the opening of the target container in each acquired echo signal is the same, when the acquisition duration of the wave peak corresponding to the opening of the target container in the current echo signal is judged to be changed compared with the acquisition duration of the wave peak corresponding to the opening of the target container in the echo signal acquired at any time within the preset duration, the liquid level near the opening of the target container can be confirmed, namely the liquid level of the liquid in the target container reaches the opening of the target container.
Wherein, another scheme is as follows: obtaining a level value e of a peak corresponding to the opening of the target container in the first echo signala(ii) a Confirmation | ea-eaIf the' l is larger than the preset threshold value, the liquid level of the liquid in the target container is confirmed to reach the opening of the target container. The arrangement positions and angles of the ultrasonic transmitter and the ultrasonic receiver are fixed; the frequency and the intensity of ultrasonic signals sent by the ultrasonic transmitter every time are the same, and meanwhile, the set position of the target container is also ensured to be fixed, so that when the liquid level of liquid in the container does not reach the opening of the target container, the level value of the peak corresponding to the opening of the target container in the echo signal obtained every time is the same, and when the level value of the peak corresponding to the opening of the target container in the current echo signal is judged, the target container is compared with the echo signal obtained at any time in the preset time length before, and the target containerWhen the level value of the peak corresponding to the opening of the device changes, the liquid level near the opening of the target container can be confirmed, namely, the liquid level of the liquid in the target container reaches the opening of the target container.
On the basis of any one of the above embodiments of the present invention, there is provided a liquid level detecting apparatus, wherein the processing unit is further configured to:
after the liquid level of the liquid in the target container is confirmed not to reach the opening of the target container, confirming any second wave peak in the first echo signal within a preset time length after the wave peak corresponding to the opening of the target container;
acquiring a time interval t from the start of the emission of the ultrasonic signal to the acquisition time of the second wave peakb(ii) a Confirmation of | tb’-tbIf the l is larger than the preset threshold value, determining that the second peak is the peak corresponding to the liquid level of the liquid in the target container; wherein, tbThe time interval from the start of sending the ultrasonic signal to the acquisition time of a third peak corresponding to the second peak in the second echo signal at any time within the preset time length; or the like, or, alternatively,
obtaining a level value e of a second peakb(ii) a Confirmation | eb-ebIf the' l is larger than the preset threshold value, confirming that the second peak is the peak corresponding to the liquid level of the liquid in the target container; wherein e isb' is a level value of a third peak corresponding to the second peak in the second echo signal acquired any time within a preset time period.
In this embodiment, two schemes are provided for finding a peak corresponding to the liquid level of the liquid in the target container in the first echo signal after it is determined that the liquid level of the liquid in the target container does not reach the opening of the target container.
The first scheme is as follows: acquiring a time interval t from the start of the emission of the ultrasonic signal to the acquisition time of the second wave peakb(ii) a Confirmation of | tb’-tbIf the l is larger than the preset threshold value, determining that the second peak is the peak corresponding to the liquid level of the liquid in the target container; wherein, tb' from the start of the ultrasonic signal to the second echo signal any time within a preset time periodThe time interval of the acquisition instant of the third peak in the number corresponding to the second peak. The arrangement positions and angles of the ultrasonic transmitter and the ultrasonic receiver are fixed; the frequency and the intensity of ultrasonic signals sent by the ultrasonic transmitter at each time are the same, and meanwhile, the set position of the target container is also fixed, so that when the liquid level of liquid in the container does not reach the opening of the target container, the acquisition duration of the wave peak corresponding to the liquid level of the liquid in the container in each acquired echo signal is different, when the second wave peak in the current echo signal is judged, the acquisition duration of the wave peak corresponding to the second wave peak is changed in comparison with the echo signal acquired at any time in the preset duration before, and then the second wave peak can be confirmed to be the wave peak corresponding to the liquid level of the liquid in the target container.
The other scheme is as follows: obtaining a level value e of a second peakb(ii) a Confirmation | eb-ebIf the' l is larger than the preset threshold value, confirming that the second peak is the peak corresponding to the liquid level of the liquid in the target container; wherein e isb' is a level value of a third peak corresponding to the second peak in the second echo signal acquired any time within a preset time period. The arrangement positions and angles of the ultrasonic transmitter and the ultrasonic receiver are fixed; the frequency and the intensity of ultrasonic signals sent by the ultrasonic transmitter every time are the same, and meanwhile, the set position of the target container is also fixed, so that when the liquid level of liquid in the container does not reach the opening of the target container, the level values corresponding to the liquid level of the liquid in the container in the echo signals obtained every time are different, when the second peak in the current echo signal is judged, compared with the level value of the peak corresponding to the second peak in the echo signals obtained at any time in the preset time, the second peak can be confirmed to be the peak corresponding to the liquid level of the liquid in the target container.
On the basis of any one of the above embodiments of the present invention, there is provided a liquid level position detection device, and an apparatus including any one of the above liquid level position detection devices.
The liquid level position detection technology is an indispensable ring in the fields of domestic electrical appliances, petrochemical industry, metallurgy, electric power, pharmacy, water supply and drainage, environmental protection and the like, and the embodiment of the invention is not particularly limited as long as the equipment comprising the liquid level detection device in the embodiment falls into the protection range.
On the basis of any one of the above specific embodiments of the present invention, there is provided a water supply device, including any one of the above liquid level position detection devices, further including a water valve for controlling the supply water flow to be turned on and off; the processing unit is in communication connection with the water valve;
and the processing unit is used for controlling the water valve to be closed after confirming that the liquid level of the liquid in the target container reaches the opening of the target container.
In the embodiment, after the processing unit confirms that the liquid level of the liquid in the target container reaches the opening of the target container, the water valve is controlled to be closed so as to stop supplying water into the target container.
On the basis of any one of the above specific embodiments of the present invention, there is provided a water supply apparatus, further comprising a water outlet, the water outlet being connected to a water valve; one of the ultrasonic transmitter and the ultrasonic receiver is arranged at a position close to the water outlet, and the other one is arranged at a position far away from the water outlet.
Wherein, the delivery port is used for controlling the water supply rivers to flow out from the assigned position. One of the ultrasonic transmitter and the ultrasonic receiver is arranged at a position close to the water outlet, and the other one is arranged at a position far away from the water outlet, so that the effect of more accurately obtaining the echo signal can be achieved.
On the basis of any one of the above specific embodiments of the present invention, there is provided a water supply device, including the liquid level position detection apparatus of the above embodiment, further including a water valve for controlling the supply water flow to be turned on and off; the processing unit is in communication connection with the water valve; a processing unit for confirming that T is less than or equal to TmAnd controlling the water valve to be closed.
After the liquid level of the liquid in the target container is confirmed not to reach the opening of the target container, calculating and comparing T and T in real timemWhen T is less than or equal to TmWhen the liquid level of the liquid in the target container reaches the opening of the target container, the water valve is controlled to be closed.
On the basis of any one of the above embodiments of the present invention, an ultrasonic sensor is used to detect the height of the water cup and the liquid level, as shown in fig. 2, an ultrasonic sensor assembly is installed above the water intake device, the ultrasonic sensor assembly includes an ultrasonic transmitter and an ultrasonic receiver, as shown in fig. 3, the specific installation position is that one side of the sensor near the water outlet is the ultrasonic receiver, and the other side is the ultrasonic transmitter. The ultrasonic waves are obviously reflected when meeting an object or an interface and form an echo, and the liquid level and the cup edge position are obtained through the time difference between the transmitted waves and the echo.
According to the embodiment of the invention, the echo signals received by the ultrasonic receiver are used for processing, analyzing and calculating, if the waveform shakes near the cup edge, the liquid level is close to the cup edge, and if the waveform shakes, the liquid level is not near the cup edge. The specific control method is as follows.
After the ultrasonic wave is transmitted from the ultrasonic transmitter and returned to the ultrasonic receiver, the waveform of the echo signal after the ultrasonic receiver receives and processes is shown in fig. 4, the abscissa is a time axis, and the ordinate is a voltage. t0 represents the starting time of the ultrasonic transmitter, tq represents the finishing time of the ultrasonic transmitter, the ultrasonic transmitter starts to transmit the pulse wave outwards after the starting time of the ultrasonic transmitter, the ultrasonic receiver forms interference due to the conduction influence of the ultrasonic transmitter and the shell aftershock, the distance cannot be detected in the period of time, a blind zone is formed, tm represents the finishing time of the blind zone of the ultrasonic receiver, and the range of the blind zone is fixed. Th represents the time when the ultrasonic receiver receives the echo reflected by the water receiving tray, and since the height of the water receiving platform is fixed, Th is fixed time duration.
After timing from the starting time of the oscillation of the ultrasonic transmitter and the timing duration Tm exceed the Tm duration, the ultrasonic receiver starts to search for wave peaks in the pulse wave cup edge and the liquid level signal received by the ultrasonic receiver, and records the time tb, tc and td of each wave peak and the levels Vb, Vc and Vd (in the embodiment, the values of the three wave peaks are compared, and more wave peaks are obtained in practical application) until the time th is reached. Transmitting a pulse wave from an ultrasonic transmitter every 30ms, continuously recording wave peak time tb1, tc1, td1, tb2, tc2, td2, tb3, tc3, td3 and level Vb1, Vc1, Vd1, Vb2, Vc2, Vd2, Vb3, Vc3 and Vd3 of the signal of the cup edge and the liquid level received by the ultrasonic receiver three times and comparing with the first recorded value, if the time variation or the level variation in three wave peaks exceeds a threshold value, indicating that the wave peak time is the liquid level signal and comparing with the first wave peak time tb, if the time difference is within the time difference of the cup edge and the liquid level when the water is full, indicating that the water is in the full water state, and if the time difference is out, supplementing the water to the full water according to the corresponding time difference.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. Liquid level position detection device, its characterized in that includes:
an ultrasonic transmitter for transmitting an ultrasonic signal to an opening of a target container;
the ultrasonic receiver is used for acquiring a reflected first echo signal;
the processing unit is used for confirming a wave crest corresponding to the opening of the target container in the first echo signal, and comparing the wave crest corresponding to the opening of the target container with a wave crest obtained at any time within a preset time length; confirming that the liquid level of the liquid in the target container reaches the opening of the target container.
2. The liquid level position detection device according to claim 1, wherein the processing unit is further configured to:
confirming a wave crest corresponding to the opening of the target container in the first echo signal, wherein the wave crest corresponding to the opening of the target container is unchanged compared with a wave crest obtained at any time within a preset time length; it is confirmed that the liquid level of the liquid in the target container does not reach the opening of the target container.
3. The fluid level position detection device according to claim 2, wherein the processing unit is further configured to:
after the liquid level of the liquid in the target container is confirmed to not reach the opening of the target container, confirming a wave crest corresponding to the liquid level of the liquid in the target container in the first echo signal;
confirming that the time interval T between the acquisition time of the wave crest corresponding to the liquid level of the liquid in the target container in the first echo signal and the acquisition time of the wave crest corresponding to the opening of the target container in the first echo signal is smaller than or equal to tm; tm is a preset time length threshold;
it is confirmed that the liquid level of the liquid in the target container reaches the opening of the target container.
4. The fluid level position detection device according to claim 2, wherein the processing unit is further configured to:
after the liquid level of the liquid in the target container is confirmed to not reach the opening of the target container, confirming a wave crest corresponding to the liquid level of the liquid in the target container in the first echo signal;
confirming that the time interval T between the acquisition time of the wave crest corresponding to the liquid level of the liquid in the target container in the first echo signal and the acquisition time of the wave crest corresponding to the opening of the target container in the first echo signal is larger than tm; tm is a preset time length threshold;
it is confirmed that the liquid level of the liquid in the target container does not reach the opening of the target container.
5. The liquid level position detection device according to claim 1, wherein the processing unit is further configured to: acquiring a time interval t from the start of the emission of the ultrasonic signal to the acquisition time of the peak corresponding to the opening of the target container in the first ultrasonic signala(ii) a Confirmation of | ta’-taIf the l is larger than the preset threshold value, the liquid level of the liquid in the target container is confirmed to reach the opening of the target container; wherein, ta' is any time within the preset time length; or the like, or, alternatively,
obtaining a level value e of a peak corresponding to the opening of the target container in the first echo signala(ii) a Confirmation | ea-eaIf the' l is larger than the preset threshold value, the liquid level of the liquid in the target container is confirmed to reach the opening of the target container; wherein e isa' is a level value of a peak corresponding to the opening of the target container in the second echo signal acquired any time within a preset time period.
6. The fluid level position detection device according to claim 3, wherein the processing unit is further configured to:
after the liquid level of the liquid in the target container is confirmed not to reach the opening of the target container, confirming any second wave peak in the first echo signal within a preset time length after the wave peak corresponding to the opening of the target container;
acquiring a time interval t from the start of the emission of the ultrasonic signal to the acquisition time of the second wave peakb(ii) a Confirmation of | tb’-tbIf the l is larger than the preset threshold value, determining that the second peak is the peak corresponding to the liquid level of the liquid in the target container; wherein, tbThe time interval from the start of sending the ultrasonic signal to the acquisition time of a third peak corresponding to the second peak in the second echo signal at any time within the preset time length; or the like, or, alternatively,
obtaining a level value e of a second peakb(ii) a Confirmation | eb-ebIf the' l is larger than the preset threshold value, confirming that the second peak is the peak corresponding to the liquid level of the liquid in the target container; wherein e isb' is a level value of a third peak corresponding to the second peak in the second echo signal acquired any time within a preset time period.
7. An apparatus comprising the liquid level position detection device according to any one of claims 1 to 6.
8. A water supply apparatus comprising the liquid level position detection device according to any one of claims 1 to 6, further comprising a water valve for controlling the supply water flow to be turned off; the processing unit is in communication connection with the water valve;
and the processing unit is used for controlling the water valve to be closed after confirming that the liquid level of the liquid in the target container reaches the opening of the target container.
9. The water supply apparatus of claim 8, further comprising a water outlet connected to the water valve; one of the ultrasonic transmitter and the ultrasonic receiver is arranged at a position close to the water outlet, and the other one is arranged at a position far away from the water outlet.
10. A water supply apparatus comprising the liquid level position detection device according to claim 4, further comprising a water valve for controlling the supply water flow to be turned off; the processing unit is in communication connection with the water valve;
and the processing unit is used for confirming that T is less than or equal to tm and controlling the water valve to be closed.
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| CN113503619A (en) * | 2021-06-11 | 2021-10-15 | 珠海格力电器股份有限公司 | Control method and device of air conditioner, controller and air conditioner |
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