CN106706074A - Liquid level detection device, liquid level detection method and detection module - Google Patents
Liquid level detection device, liquid level detection method and detection module Download PDFInfo
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- CN106706074A CN106706074A CN201710012358.XA CN201710012358A CN106706074A CN 106706074 A CN106706074 A CN 106706074A CN 201710012358 A CN201710012358 A CN 201710012358A CN 106706074 A CN106706074 A CN 106706074A
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- parameter value
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- absolute threshold
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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 detection device, a liquid level detection method and a detection module. The liquid level detection device comprises a probe and a motion control module. The method includes collecting a parameter value between the probe and a reference surface; determining whether or not the parameter value reaches an absolute threshold value; seeding a first signal to respond when the parameter value reaches the absolute threshold value, wherein the first signal indicates the motion control module to control the probe to stop motion or slow down; determining whether or not a parameter value collected when the probe stops motion or slows down reaches the absolute threshold value; sending a second signal to respond when the parameter value reaches the absolute threshold value, wherein the second signal indicates the motion control module to control the probe to complete detection motion. The liquid level detection device, the liquid level detection method and the detection module have the advantages that digital signal noise can be filtered out without influences on detection sensitivity, and accuracy in liquid level detection is improved.
Description
Technical field
The application is related to check apparatus field, more particularly to liquid detection device and method and detecting module.
Background technology
At present, generally carried out using liquid detection device (for example, capacitive liquid-level detecting device) in biomedical devices
Detecting liquid level.In order to the carrying for reducing testing instruments probe is polluted, each production firm would generally configure liquid level on instrument probe
Detecting module.Therefore, the stability of detecting liquid level, promptness, accuracy can directly affect the assay of sample.
A kind of existing liquid detection device judges whether to detect liquid level using relative threshold.Performing detecting liquid level
During action, as probe is moved downward, parameter value between probe and datum level (for example, capacitance, capacitance frequency of oscillation,
Slope of capacitance etc.) change, when the relative variation before and after parameter value meets relative threshold, i.e. output is detected
The signal of liquid level.
Another existing liquid detection device judges whether to detect liquid level using absolute threshold.Visited liquid level is performed
When survey is acted, as probe is moved downward, the parameter value between probe and datum level changes, and when parameter value, to reach this absolute
During threshold value, i.e. output detects the signal of liquid level.
During actual test, there may come a time when data-signal noise occur.Filled using these existing detecting liquid levels
Put when carrying out detecting liquid level, if there is the data-signal noise for reaching judgment threshold, then erroneous judgement can occur, influence liquid level is visited
The accuracy of survey.
In the liquid detection device using relative threshold, removed usually using arithmetic mean filtering or Recursive Filtering method
Data-signal noise.But need a timing because above-mentioned filtering algorithm needs the collection of continuous acquisition multiple data, each data
Between, therefore signal output can be caused to postpone, detecting module is reacted slack-off so as to cause the detectivity to reduce, cause detection dead
Volume increases.In the liquid detection device using absolute threshold, it is also desirable to the interference of data-signal noise can be prevented effectively from
Approach.
The content of the invention
In order to avoid being disturbed by data-signal noise during detecting liquid level is performed, present disclose provides liquid level
Detection device and method and detecting module.
According to an aspect of this disclosure, there is provided a kind of method performed by liquid detection device.The detecting liquid level is filled
Put including probe and motion-control module.The method includes：Parameter value between acquisition probe and datum level；Determine the parameter value
Whether absolute threshold is reached；The first signal is sent in response to determining the parameter value to reach absolute threshold, the first signal designation fortune
Dynamic control module control probe pause motion slows down motion；It is determined that the ginseng gathered in probe pause motion or during slowing down motion
Whether numerical value reaches absolute threshold；And secondary signal is sent in response to determining parameter value to reach absolute threshold, secondary signal
Moving control module for controlling probe is indicated to complete detection action.
According to another aspect of the present disclosure, there is provided a kind of detecting module for liquid detection device.The detecting liquid level
Device includes probe and motion-control module.The detecting module includes：Collecting unit, between acquisition probe and datum level
Parameter value；First determining unit, for determining whether the parameter value reaches absolute threshold；First signal generation unit, for ringing
Should determine that the parameter value reaches absolute threshold and sends the first signal in the first determining unit, the first signal designation motion control mould
Block controls probe pause motion or slows down motion；Second determining unit, for determining by collecting unit in probe pause motion or
Whether the parameter value gathered during slowing down motion reaches absolute threshold；And secondary signal generation unit, in response to second
Determining unit determines that parameter value reaches absolute threshold and sends secondary signal, and secondary signal indicates moving control module for controlling probe
Complete detection action.
According to another aspect of the present disclosure, there is provided a kind of liquid detection device.The liquid detection device includes as above institute
The detecting module stated.
Existing liquid detection device and method may be subject to data-signal noise during detecting liquid level is performed
Interference.Liquid detection device in accordance with an embodiment of the present disclosure and method and detecting module can not influence detection sensitive
Data-signal noise is filtered in the case of degree, the accuracy of detecting liquid level is improve.
Brief description of the drawings
Below, the feature of exemplary embodiment of the invention, advantage and technique effect will be described with reference to accompanying drawing, it is attached
Similar reference represents similar element in figure, wherein：
Fig. 1 shows the schematic diagram of liquid detection device in accordance with an embodiment of the present disclosure；
Fig. 2 shows the simplified block diagram of detecting module in accordance with an embodiment of the present disclosure；
Fig. 3 shows the flow chart of detecting liquid level method in accordance with an embodiment of the present disclosure；And
Fig. 4 is the oscillogram of the parameter value variation described during detecting liquid level in accordance with an embodiment of the present disclosure.
Specific embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below.In following detailed description
In, it is proposed that many details, to provide complete understanding of the present invention.But, to those skilled in the art
It will be apparent that the present invention can be implemented in the case of some details in not needing these details.Below to implementing
The description of example is better understood from just for the sake of being provided by showing example of the invention to of the invention.The invention is not restricted to
Any concrete configuration set forth below and algorithm, but element, portion are covered under the premise of without departing from the spirit of the present invention
Any modification, replacement and the improvement of part and algorithm.
Refer to that " one embodiment ", " embodiment ", " illustrative embodiment ", " each embodiment " etc. represent institute in the application
(one or more) embodiment of description can include specific feature, structure or feature, but not be that each embodiment must be wrapped
Include specific feature, structure or the feature.And, reusable phrase " in one embodiment " is not necessarily referring to same reality
Example is applied, although it may refer to same embodiment.
With reference now to Fig. 1, Fig. 1 shows the schematic diagram of liquid detection device 100 in accordance with an embodiment of the present disclosure.As schemed
Shown in 1, liquid detection device 100 includes detecting module 110, probe 120 and motion-control module 130.Liquid detection device
100 can also include required various other modules, and can communicatedly be connected between each module.
Probe 120 is used for the liquid level of contact measured liquid.Probe 120 can for example include the probe being made up of metal material
(such as, draw point) or the probe being made up of conductive nonmetal material (such as, conductive plastics).In embodiment, probe 120 can be with
It is that hollow (such as, liquid absorbing probe) can also be solid.In addition, though it is referred to as " probe ", but in fact, probe 120 can
To be arbitrary shape, such as, and needle-like, bar-shaped, block, banding, ring-type etc..Shape, size of probe 120 etc. can bases
It is actually needed and sets.
Motion-control module 130 is used to control the motion of probe 120.Motion-control module 130 can for example include actuating
Device and processing unit.Processing unit for example can be single microprocessor, microcontroller, digital signal processor (DSP), existing
Field programmable gate array (FPGA), application specific integrated circuit (ASIC) etc..In certain embodiments, processing unit can also be with spy
Module 110 is surveyed to become one.
By taking capacitive liquid-level detecting device as an example, probe 120 and datum level (for example, wall of a container of testing liquid) are respectively
Form a pole of capacitor.Gas above testing liquid and liquid is the medium between the two poles of the earth of capacitor.Testing liquid
Permittivity ε 1 and liquid above gas permittivity ε 2 it is different, such as, and ε 1>ε2.Between the two poles of the earth of capacitor away from
Changed as probe is moved under the control of motion-control module 130 from total dielectric constant.
For example, the control probe 120 of motion-control module 130 is moved downward, detecting module 110 is sensed during decline
Capacitance change reaches absolute threshold and then controls probe 120 to stop moving downward by motion-control module 130.Probe 120 is
The no liquid level that touches generally is judged by capacitance change.Capacitance change is very small, and (generally pico farad (pF) is measured
Level) so that judging to reduce detection dead volume in time.The term " dead volume " that the disclosure is used refers to detecting mould
The liquid minimum volume that block is able to detect that.Dead volume is relevant with capacitance change and data acquisition rate etc., such as, judge to get over
Hurry up, then dead volume is smaller.
Motion-control module 130 can be communicated with detecting module 110.For example, motion-control module 130 can be to spy
The signal that module 110 sends the motion state for representing probe is surveyed, detecting module 110 can also be by motion-control module 130
Sending signal controls the motion of probe 120.
For detecting module 110, described in detail below with reference to Fig. 2.
Fig. 2 shows the simplified block diagram of detecting module 200 in accordance with an embodiment of the present disclosure.Detecting module 200 for example may be used
It is applied to the liquid detection device 100 shown in Fig. 1.
Detecting module 200 can include collecting unit 210, the first determining unit 220, the first signal generation unit 230, the
Two determining units 240 and secondary signal generation unit 250.In certain embodiments, as needed, detecting module 200 may be used also
With including other units such as detecting liquid level confirmation unit 260, the 3rd signal generation unit 270, noise signal confirmation units 280.
Can communicatedly be connected between unit, with coordinate operation.
In certain embodiments, collecting unit 210 is used for acquisition probe (for example, probe 120 of Fig. 1) and datum level (example
Such as, the wall of a container of testing liquid) between parameter value, for example, capacitance, capacitance frequency of oscillation, slope of capacitance etc.
Deng.Alternatively, detecting module 200 can also include AD conversion unit (not shown), the analog parameter amount that sampling is obtained
Be converted to parameter value.
In certain embodiments, the first determining unit 220 is used to determine whether the parameter value that collecting unit 210 is gathered reaches
To absolute threshold.For example, the absolute threshold can be used to judge that the probe (for example, probe 120 of Fig. 1) of liquid detection device is
The no liquid level for touching testing liquid.
By taking capacitive liquid-level detecting device as an example, when probe touches the liquid level of testing liquid, probe and datum level it
Between parameter value can undergo mutation, may represent that probe has touched the liquid level of testing liquid so as to reach absolute threshold,
Work(detects liquid level.But during actual test, there may come a time when data-signal noise occur.It is strong when data-signal noise
Degree is when reaching absolute threshold, may result in capacitive liquid-level detecting device be mistaken for successful probe to liquid level so that shadow
Ring the accuracy of detecting liquid level.The one side of the disclosure is devoted to solving such problem.The present inventor is being sent out
Found during bright creation, such data-signal noise duration is often shorter, for example, usually 1 data is jumped
Height.
In certain embodiments, when the first determining unit 220 determines probe (for example, probe 120 of Fig. 1) and datum level
When parameter value between (for example, wall of a container of testing liquid) reaches absolute threshold, the first signal generation unit 230 is generated simultaneously
The first signal is sent to motion-control module (for example, motion-control module 130 of Fig. 1).Motion-control module (for example, Fig. 1
Motion-control module 130) probe (for example, probe 120 of Fig. 1) pause motion is controlled after the first signal is received or is slowed down
Motion (will probe motion speed be reduced to it is a certain meet require speed, zero) speed can be.
In certain embodiments, in probe (for example, probe 120 of Fig. 1) pause motion or during slowing down motion, collection is single
Ginseng between first 210 continuous collecting probes (for example, probe 120 of Fig. 1) and datum level (for example, wall of a container of testing liquid)
Numerical value.For example, collecting unit 210 can gather one or more parameter values.
In certain embodiments, when collecting unit 210 gathers a parameter value, the second determining unit 240 judges the ginseng
Whether numerical value reaches above-mentioned absolute threshold.When the second determining unit 240 determines that the parameter value reaches absolute threshold, secondary signal
Generation unit 250 is generated and sends secondary signal to motion-control module (for example, motion-control module 130 of Fig. 1).Motion control
Molding block (for example, motion-control module 130 of Fig. 1) controls probe in response to receiving secondary signal (for example, the spy of Fig. 1
Pin 120) detection action is completed, for example, being resetted.In a further embodiment, when the second determining unit 240 determines the parameter
When value is not up to absolute threshold, secondary signal generation unit 250 will not generate any signal.So as to motion-control module (example
Such as, the motion-control module 130 of Fig. 1) probe is controlled (for example, Fig. 1 due to not receiving secondary signal in setting time section
Probe 120) continue according to predetermined speed motion detecting liquid level.Setting time section can be based on actual demand, detection spirit
Sensitivity, response speed etc. pre-set.Alternately, detecting module 200 can also include the 3rd signal generation unit 270.
When the second determining unit 240 determine the parameter value be not up to absolute threshold when, the 3rd signal generation unit 270 can generate and to
Motion-control module (for example, motion-control module 130 of Fig. 1) sends the 3rd signal.Motion-control module is (for example, the fortune of Fig. 1
Dynamic control module 130) control probe (for example, probe 120 of Fig. 1) to continue according to pre- constant speed in response to receiving the 3rd signal
Degree moves to detect liquid level.In certain embodiments, detecting module 200 can also include detecting liquid level confirmation unit 260.The liquid
Face detection confirmation unit 260 is used to determine that the parameter value reaches absolute threshold and confirms probe in response to the second determining unit 240
(for example, probe 120 of Fig. 1) has touched the liquid level of testing liquid, i.e., successfully detect liquid level.So as to motion-control module
(for example, motion-control module 130 of Fig. 1) can control probe to the instruction of liquid level (for example, Fig. 1 in response to successful probe
Probe 120) complete detection action, for example, being resetted.In other Shi Lizhong, detecting module 200 can also be wrapped alternatively
Include noise signal confirmation unit 280.The noise signal confirmation unit 280 is used to determine the ginseng in response to the second determining unit 240
Numerical value is not up to absolute threshold and confirms to detect noise signal, for example, data-signal noise.So as to motion-control module (example
Such as, the motion-control module 130 of Fig. 1) probe can be controlled (for example, Fig. 1 in response to detecting the instruction of data-signal noise
Probe 120) continue according to predetermined speed motion detecting liquid level.
In other embodiments, when collecting unit 210 is in probe (for example, probe 120 of Fig. 1) pause motion or slows down fortune
During dynamic during collection multiple (for example, 2 or more) parameter value, the second determining unit 240 is configured to determine that multiple parameters
The parameter value that whether half is had more than in value reaches above-mentioned absolute threshold.In this example, the second determining unit 240 is in probe (example
Such as, the probe 120 of Fig. 1) pause motion or slow down motion during continuously judge 3-5 parameter value, you can acquisition satisfactorily
Accuracy.In certain embodiments, the parameter value that half is had more than in the second determining unit 240 determines multiple parameter values reaches
During above-mentioned absolute threshold, secondary signal generation unit 250 is generated and to motion-control module (for example, the motion-control module of Fig. 1
130) secondary signal is sent.Motion-control module (for example, motion-control module 130 of Fig. 1) is in response to receiving secondary signal
And control probe (for example, probe 120 of Fig. 1) to complete detection and act, for example, being resetted.In a further embodiment, when
When two determining unit 240 determines that the parameter value for having not enough half in multiple parameter values reaches absolute threshold, secondary signal generation is single
Unit 250 will not generate any signal.So as to motion-control module (for example, motion-control module 130 of Fig. 1) is due in setting
Secondary signal is not received in time period and control probe (for example, probe 120 of Fig. 1) to continue according to predetermined speed motion to visit
Survey liquid level.Setting time section can be pre-set based on actual demand, detectivity, response speed etc..Alternately,
When the second determining unit 240 determines that the parameter value for having not enough half in multiple parameter values reaches absolute threshold, the life of the 3rd signal
Can be generated into unit 270 and send the 3rd signal to motion-control module (for example, motion-control module 130 of Fig. 1).Motion
Control module (for example, motion-control module 130 of Fig. 1) controls probe in response to receiving the 3rd signal (for example, Fig. 1
Probe 120) continue according to predetermined speed motion to detect liquid level.In certain embodiments, detecting liquid level confirmation unit 260 is matched somebody with somebody
It is set to and determines that the parameter value that half is had more than in multiple parameter values reaches absolute threshold and confirms in response to the second determining unit 240
Probe (for example, probe 120 of Fig. 1) has touched the liquid level of testing liquid, i.e., successfully detect liquid level.So as to motion control
Module (for example, motion-control module 130 of Fig. 1) can in response to successful probe controlled to the instruction of liquid level probe (for example,
The probe 120 of Fig. 1) detection action is completed, for example, being resetted.In other Shi Lizhong, the quilt of noise signal confirmation unit 280
It is configured to determine that the parameter value for having not enough half in multiple parameter values reaches absolute threshold and true in response to the second determining unit 240
Recognize and detect noise signal, for example, data-signal noise.So as to motion-control module is (for example, the motion-control module of Fig. 1
130) probe (for example, probe 120 of Fig. 1) can be controlled to continue according to pre- in response to detecting the instruction of data-signal noise
Constant speed degree moves to detect liquid level.
Alternatively, detecting module 200 can also need unit including other, for example, control unit and register cell are (not
Show).Control unit is used to control above all parts in concert with to operate.Register cell can be stored in detecting liquid level
During produce data and information.
Illustrated above is the example of the detecting module 200 according to the disclosure.Although it should be pointed out that provided herein
Detecting module is shown and described as including multiple units, but according to the requirement of the function of being realized, according to the spy of the disclosure
Surveying module can include more or less unit.
In certain embodiments, detecting module 200 may be implemented as hardware, software, firmware or combinations thereof.When
When realizing in hardware, it may, for example, be electronic circuit, application specific integrated circuit (ASIC), field programmable gate array
(FPGA), appropriate firmware, plug-in unit, function card etc..When being realized with software mode, element of the invention is used to realize
The program or code segment of required function.Program or code segment can be stored in machine readable media, or by carrier wave
The data-signal of middle carrying send in transmission medium or communication links." machine readable media " can include can store or
Any medium of transmission information.The example of machine readable media include electronic circuit, semiconductor memory devices, ROM, flash memory,
Erasable ROM (EROM), floppy disk, CD-ROM, CD, hard disk, fiber medium, radio frequency (RF) link, etc..Code segment can be through
It is downloaded by the computer network of internet, Intranet etc..
Fig. 3 shows the flow chart of detecting liquid level method 300 in accordance with an embodiment of the present disclosure.In certain embodiments,
Method 300 can be implemented in liquid detection device 100 (Fig. 1), for example, can be realized by detecting module 200.
In the step 310, parameter value of the acquisition probe (for example, probe 120 of Fig. 1) and datum level between, for example, electric capacity
Value, capacitance frequency of oscillation, the slope of capacitance etc..Step 310 for example can be by the collecting unit of detecting module 200
210 perform.
In step 320, it is determined that whether the parameter value for being gathered reaches absolute threshold.For example, the absolute threshold can be used
Whether the probe (for example, probe 120 of the liquid detection device 100 of Fig. 1) to judge liquid detection device touches prepare liquid
The liquid level of body.The step 320 can for example be performed by the first determining unit 220 of detecting module 200.
In a step 330, in response to determining probe (for example, probe 120 of Fig. 1) with datum level (for example, testing liquid
Wall of a container) between parameter value reach above-mentioned absolute threshold and to the motion-control module of liquid detection device (for example, Fig. 1
Motion-control module 130) send the first signal.The motion-control module (for example, motion-control module 130 of Fig. 1) is connecing
After receiving the first signal, that is, controlling probe (for example, probe 120 of Fig. 1) pause motion or slow down motion (will probe motion
Speed is reduced to a certain speed for meeting and requiring, zero) speed can be.The step 330 for example can be by detecting module 200
The first signal generation unit 230 perform.
In certain embodiments, probe (for example, probe 120 of Fig. 1) pause motion or slow down motion during, probe
Parameter value between (for example, probe 120 of Fig. 1) and datum level (for example, wall of a container of testing liquid) is by (for example, collection
Unit 210) continuous collecting.For example, can be gathered in probe (for example, probe 120 of Fig. 1) pause motion or during slowing down motion
One or more parameter values.
In step 340, it is determined that probe pause motion or slow down motion during gather parameter value whether reach it is above-mentioned
Absolute threshold.Needing the number of the capacitance for judging can be configured according to actual needs and in advance.The step 340 for example may be used
To be performed by the second determining unit 240 of detecting module 200.
In certain embodiments, when probe pause motion or slow down motion during gather a parameter value when, in step
In 340, judge whether the parameter value reaches above-mentioned absolute threshold.When it is determined that the parameter value reaches absolute threshold, can be in step
Generated in rapid 350 and send secondary signal to motion-control module (for example, motion-control module 130 of Fig. 1).Motion control mould
Block (for example, motion-control module 130 of Fig. 1) controls probe in response to receiving secondary signal (for example, the probe of Fig. 1
120) detection action is completed, for example, being resetted.In a further embodiment, when it is determined that the parameter value is not up to absolute threshold
When, any signal is not generated.So as to motion-control module (for example, motion-control module 130 of Fig. 1) is due in setting time
Secondary signal is not received in section and control probe (for example, probe 120 of Fig. 1) to continue according to predetermined speed motion to detect liquid
Face.Setting time section can be pre-set based on actual demand, detectivity, response speed etc..Alternately, when true
When the fixed parameter value is not up to absolute threshold, can generate and to motion-control module (for example, the motion-control module of Fig. 1
130) the 3rd signal is sent.Motion-control module (for example, motion-control module 130 of Fig. 1) is in response to receiving the 3rd signal
And control probe (for example, probe 120 of Fig. 1) to continue according to predetermined speed motion to detect liquid level.In certain embodiments, may be used
Confirm probe (for example, probe 120 of Fig. 1) and touched testing liquid with response to determining the parameter value to reach absolute threshold
Liquid level, i.e., successfully detect liquid level.So as to motion-control module (for example, motion-control module 130 of Fig. 1) can be responded
Control probe (for example, probe 120 of Fig. 1) to complete detection to the instruction of liquid level in successful probe to act, for example, being answered
Position.In other Shi Lizhong, can confirm to detect noise signal in response to determining the parameter value to be not up to absolute threshold, example
Such as, data-signal noise.So as to motion-control module (for example, motion-control module 130 of Fig. 1) can be in response to detecting
The instruction of data-signal noise and control probe (for example, probe 120 of Fig. 1) continue according to predetermined speed motion to detect liquid
Face.
In other embodiments, when probe pause motion or slow down motion during gather multiple (for example, 2 or more
It is individual) parameter value when, judge that the parameter value that whether half is had more than in multiple parameter values reaches above-mentioned absolute threshold.If it is determined that many
The parameter value that half is had more than in individual parameter value reaches above-mentioned absolute threshold, then in step 350 to motion-control module (example
Such as, the motion-control module 130 of Fig. 1) send secondary signal.Motion-control module controls to visit in response to receiving secondary signal
Pin (for example, probe 120 of Fig. 1) completes detection action, for example, being resetted.The step 350 for example can be by detecting module
200 secondary signal generation unit 250 is performed.In certain embodiments, if it is determined that have not enough half in multiple parameter values
Parameter value reach above-mentioned absolute threshold, then can be sent to motion-control module (for example, motion-control module 130 of Fig. 1)
3rd signal, to cause that control module (for example, motion-control module 130 of Fig. 1) is controlled in response to receiving the 3rd signal
Probe (for example, probe 120 of Fig. 1) continues according to predetermined speed motion to detect liquid level.In a further embodiment, in order to save
Save signal resource, if it is determined that the parameter value for having not enough half in multiple parameter values reaches above-mentioned absolute threshold, then do not generate and appoint
What signal.So as to motion-control module (for example, motion-control module 130 of Fig. 1) in setting time section due to not receiving
Secondary signal and control probe (for example, probe 120 of Fig. 1) continue according to predetermined speed motion to detect liquid level.During the setting
Between section can be pre-set based on actual demand, detectivity, response speed etc..In certain embodiments, the disclosure
The detecting liquid level method 300 of embodiment may be responsive to determine what is gathered in probe pause motion or during slowing down motion
The parameter value for having not enough half in multiple parameter values reaches above-mentioned absolute threshold, and confirms probe (for example, probe 120 of Fig. 1)
The liquid level of testing liquid is touched, i.e., has successfully detected liquid level.Then, can be to motion-control module (for example, the fortune of Fig. 1
Dynamic control module 130) indicate successful probe to liquid level so that the moving control module for controlling probe is (for example, the probe of Fig. 1
120) detection action is completed, for example, being resetted.In certain embodiments, the detecting liquid level method 300 of embodiment of the disclosure
May be responsive to determine have not enough half in the multiple parameter values gathered in probe pause motion or during slowing down motion
Parameter value reach above-mentioned absolute threshold and confirm to detect data-signal noise.Then, can be to motion-control module (example
Such as, the motion-control module 130 of Fig. 1) indicate to detect data-signal noise so that the moving control module for controlling probe (example
Such as, the probe 120 of Fig. 1) continue according to predetermined speed motion to detect liquid level.
Illustrated above is the example flow diagram of detecting liquid level method in accordance with an embodiment of the present disclosure.It should be understood that
It is, although method provided herein is shown and described as a series of actions or event, but the disclosure does not receive this shown
A little actions or the limitation of the sequence of event.For example, in addition to shown and/or description order, some actions can be with other
Order occur and/or with other action or event simultaneously occur.In addition, the method can also include be not shown its
It is acted, and and the not all action for showing all is desirable.
Liquid detection device in accordance with an embodiment of the present disclosure and method and detecting module can not influence detection spirit
Data-signal noise is filtered in the case of sensitivity, the accuracy of detecting liquid level is improve.
Below with reference to Fig. 4, Fig. 4 is the parameter value variation described during detecting liquid level in accordance with an embodiment of the present disclosure
Oscillogram 400.It should be noted that as seen from Figure 4, the need for actual test scheme, ordinate is represented " resonant frequency ".
As one of ordinary skill in the understanding, in typical LC oscillating circuits, resonant frequencyWherein L is represented
Inductance value, C represents capacitance.In the case of known to inductance L, capacitance C can be immediately arrived at resonance frequently according to the formula
Rate ω0Relation.Therefore, resonance frequency omega is not used within a context0To be described, but directly using capacitance C this
One more intuitively physical quantity is described.
By taking capacitive liquid-level detecting device as an example, when probe touches the liquid level of testing liquid, probe and datum level it
Between capacitance (or resonant frequency) can undergo mutation (as shown in Figure 4), so as to reach absolute threshold (for example, absolute threshold
410) may represent that probe has touched the liquid level of testing liquid, i.e., successfully detect liquid level (for example, detection success events
420).But during actual test, there may come a time when data-signal noise (for example, data-signal noise 430) occur.From figure
4 is visible, and the intensity of data-signal noise 430 has reached absolute threshold 410.Existing capacitive liquid-level detecting device may
By data-signal noise 430 be mistaken for successful probe to liquid level, so as to influence the accuracy of detecting liquid level.Hair of the invention
A person of good sense has found that the duration of data-signal noise 430 is shorter during innovation and creation are carried out, for example, usually 1 number
According to trip point.
By the liquid detection device and method and detecting module of the disclosure, when detecting data-signal noise 430
When intensity reaches absolute threshold 410, detecting module (for example, detecting module 110 and 200) is to motion-control module (for example, motion
Control module 130) send the first signal.Motion-control module receives i.e. control probe (for example, probe 120) after the first signal
Pause motion or slow down motion (will probe motion speed be reduced to it is a certain satisfaction require speed, zero) speed can be.
Detecting module judges whether n parameter value reaches absolute threshold 410 in probe pause motion or during slowing down motion, and wherein n is
The positive integer that can be pre-configured with according to actual needs.If the parameter value that half is had more than in n parameter value reaches absolute threshold
Value 410, then detecting module can confirm that probe has touched liquid level, immediately can to motion-control module send second believe
Number.I.e. control probe completes detection action after motion-control module receives secondary signal, for example, resetting.If n parameter value
In have not enough half parameter value reach absolute threshold 410, then detecting module can confirm that the signal that detects for noise signal,
The 3rd signal can be sent to motion-control module immediately.I.e. control probe continues after motion-control module receives the 3rd signal
Move to carry out detecting liquid level according to predetermined speed.Alternately, in order to save signal resource, detecting module is it is determined that n ginseng
The parameter value for having not enough half in numerical value can not send any signal when reaching absolute threshold 410 to motion-control module.Fortune
Dynamic control module controlled due to not receiving any signal in setting time section probe continue according to predetermined speed move with
Carry out detecting liquid level.Setting time section can be pre-set based on actual demand, detectivity, response speed etc..
Analyze visible more than, liquid detection device and method and detecting module energy in accordance with an embodiment of the present disclosure
Enough interference that data-signal noise is excluded in the case where detectivity is not influenceed, improve the accuracy of detecting liquid level.
While the invention has been described with reference to exemplary embodiments thereof, it should be appreciated that, the disclosure is not limited to above-mentioned
The structures and methods of embodiment.On the contrary, it is intended to cover various modifications and equivalent arrangements.Although in addition, showing various
The various elements and method and step of disclosed invention are shown in example property combination and construction, but including more, less unit
Other combinations of part or method also fall within the scope of the disclosure.
Claims (17)
1. it is a kind of by liquid detection device perform method, the liquid detection device include probe and motion-control module, its
It is characterised by, methods described includes：
Gather the parameter value between the probe and datum level；
Determine whether the parameter value reaches absolute threshold；
The first signal is sent in response to determining the parameter value to reach the absolute threshold, is transported described in first signal designation
Dynamic control module controls the probe pause motion or slows down motion；
It is determined that whether the parameter value gathered in the probe pause motion or during slowing down motion reaches the absolute threshold；And
Secondary signal is sent in response to determining the parameter value to reach the absolute threshold, the secondary signal indicates the fortune
Dynamic control module controls the probe to complete detection action.
2. method according to claim 1, it is characterised in that it is determined that in the probe pause motion or during slowing down motion
Whether the parameter value of collection reaches the absolute threshold, including：
One or more parameter values are gathered in the probe pause motion or during slowing down motion；And
When the collecting unit be configured as the probe pause motion or slow down motion during gather multiple parameter values when, really
The parameter value that whether half is had more than in fixed the multiple parameter value reaches the absolute threshold.
3. method according to claim 2, it is characterised in that in response to determining that the parameter value reaches the absolute threshold
And secondary signal is sent, including：
Described the is sent in response to determining the parameter value that half is had more than in the multiple parameter value to reach the absolute threshold
Binary signal.
4. method according to claim 2, it is characterised in that also include：In response to determining to have in the multiple parameter value
The absolute threshold is reached more than the parameter value of half and confirm to detect liquid level.
5. method according to claim 2, it is characterised in that also include：In response to determining to have in the multiple parameter value
The absolute threshold is reached more than the parameter value of half and send the 3rd signal, motion control mould described in the 3rd signal designation
Block controls the probe to continue to be moved according to predetermined speed.
6. method according to claim 2, it is characterised in that also include：In response to determining to have in the multiple parameter value
The parameter value of not enough half reaches the absolute threshold and confirms to detect noise signal.
7. method according to claim 2, it is characterised in that also include：In response to determining to have in the multiple parameter value
The parameter value of not enough half reaches the absolute threshold without sending the secondary signal, with cause the motion-control module by
The probe is controlled to continue according to predetermined speed motion in not receiving the secondary signal in setting time section.
8. method according to claim 1, wherein, the datum level include the liquid where wall of a container.
9. a kind of detecting module for liquid detection device, the liquid detection device includes probe and motion-control module,
The probe is used for the liquid level of contact measured liquid, and the motion-control module is used to control the motion of the probe, its feature
It is that the detecting module includes：
Collecting unit, for gathering the parameter value between the probe and datum level；
First determining unit, for determining whether the parameter value reaches absolute threshold；
First signal generation unit, for determining that the parameter value reaches the absolute threshold in response to first determining unit
And the first signal is sent, probe pause motion described in moving control module for controlling described in first signal designation or slow down fortune
It is dynamic；
Second determining unit, for determine by the collecting unit the probe pause motion or slow down motion during gather
Whether parameter value reaches the absolute threshold；And
Secondary signal generation unit, for determining that the parameter value reaches the absolute threshold in response to second determining unit
And secondary signal is sent, the secondary signal indicates probe described in the moving control module for controlling to complete detection action.
10. detecting module according to claim 9, it is characterised in that：
The collecting unit is configured as gathering one or more parameter values in the probe pause motion or during slowing down motion；
And
When the collecting unit be configured as the probe pause motion or slow down motion during gather multiple parameter values when, institute
State the second determining unit be configured to determine that in the multiple parameter value the parameter value for whether having more than half reach it is described definitely
Threshold value.
11. detecting modules according to claim 10, it is characterised in that the secondary signal generation unit is configured as ringing
Second determining unit described in Ying Yu determine the parameter value that half is had more than in the multiple parameter value reach the absolute threshold and
Send the secondary signal.
12. detecting modules according to claim 10, it is characterised in that also include：Detecting liquid level confirmation unit, for ringing
Second determining unit described in Ying Yu determine the parameter value that half is had more than in the multiple parameter value reach the absolute threshold and
Confirmation detects liquid level.
13. detecting modules according to claim 10, it is characterised in that also include：3rd signal generation unit, for ringing
Second determining unit described in Ying Yu determine the parameter value for having not enough half in the multiple parameter value reach the absolute threshold and
The 3rd signal is sent, probe described in moving control module for controlling described in the 3rd signal designation continues to be transported according to predetermined speed
It is dynamic.
14. detecting modules according to claim 10, it is characterised in that also include：Noise signal confirmation unit, for ringing
Second determining unit described in Ying Yu determine the parameter value for having not enough half in the multiple parameter value reach the absolute threshold and
Confirmation detects noise signal.
15. detecting modules according to claim 10, it is characterised in that the secondary signal generation unit is configured as
Second determining unit is not given birth to when determining that the parameter value for having not enough half in the multiple parameter value reaches the absolute threshold
Into the secondary signal, to cause the motion-control module due to not receiving the secondary signal in setting time section
The probe is controlled to continue to be moved according to predetermined speed.
16. detecting modules according to claim 9, it is characterised in that the datum level includes the appearance where the liquid
The wall of device.
17. a kind of liquid detection devices, it is characterised in that including the detecting module as any one of claim 9-16.
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