CN101162212A - Liquid measuring device - Google Patents
Liquid measuring device Download PDFInfo
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- CN101162212A CN101162212A CNA2006101525002A CN200610152500A CN101162212A CN 101162212 A CN101162212 A CN 101162212A CN A2006101525002 A CNA2006101525002 A CN A2006101525002A CN 200610152500 A CN200610152500 A CN 200610152500A CN 101162212 A CN101162212 A CN 101162212A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The invention discloses a fluid measuring device which is used in a fluid tank for storing fluid and is provided with a logic operation unit, capacitance sensing assembly and a capacitance sensing circuit. Wherein, the capacitance sensing circuit measures the capacitance value of the capacitance sensing assembly though the input of stable current, and transfers the capacitance value into the physical characteristic information of the fluid through the logic operation unit; the physical characteristic information can comprises viscosity of the fluid, density of the fluid, and any one of the physical characteristics of the fluid in the liquid height. In addition, the capacitance sensing assembly can be further provided with standard capacitance assembly and capacitance assembly for measuring the fluid virtually, and can obtain the capacitance value of the capacitance assembly for measuring the fluid virtually through a differential circuit of the capacitance sensing circuit.
Description
Technical field
The invention relates to a kind of liquid measuring device, the fluid sensing circuit that it particularly provides a capacitance type sensor is used for the fluid physics feature of meter fluid groove.
Background technology
Known liquid measuring device is to use in the metering of the physical features of fluid, and such as concentration of fluid, density or Fluid Volume, general liquid measuring device normally volume is big and assembly is complicated, also causes its cost than higher because of such result simultaneously.Yet the product that volume is little and cost is low also becomes more and more important under the market demand.With the fuel cell system is example, the trend that fuel cell system is used in portable electronic devices is remarkable gradually, and utilize hydrogen-rich fuel fluid (as methyl alcohol) and oxygen fuel fluid to carry out electrochemical reaction and in the fuel cell system of output power, need allow the user know, when fuel fluid concentration deficiency or storage are not enough and must the postcombustion fluid, so fuel fluid liquid level and fuel fluid capacity in must detecting fuel fluid container.And detecting fuel fluid concentration and fuel fluid storage are provided in the general fuel fluid container is to see through expensive gage probe, use in a large number in the Portable electric equipment products for present needs, and be quite uneconomic.
Therefore, the present inventor is because the method for known monitoring fluid physical characteristics and the disappearance of device thereof are urgently to think to invent a kind of liquid measuring device.
Summary of the invention
Fundamental purpose of the present invention provides a kind of liquid measuring device, in order to other physical characteristics of concentration, density, liquid level or the fluid of meter fluid.
Another object of the present invention provides a kind of liquid measuring device, be that this liquid measuring device is applied to fuel cell system, and in order to other physical characteristics of fuel fluid concentration, fuel fluid density, fuel fluid liquid level or the fuel fluid of metering fuel battery system.
A further object of the present invention provides a kind of liquid measuring device, this metering method can be utilized the sensing apparatus that places in the fluid, change by this its electrical specification of capacitance sensing apparatus sensing, its electrical characteristic signal is changed via Fluid Volume slowdown monitoring circuit device, and obtain the physical quantity of required calculation, and then learn the fluid physics characteristic in this fluid.
A further object of the present invention provides a kind of liquid measuring device, and it is that a standard electrical signal can be provided, in order to proofread and correct fluid through using the back because the product of electrochemical reaction or the error that change caused of temperature.
In order to reach above-mentioned purpose of the present invention, a kind of liquid measuring device, it is the fluid slot that is used for store fluid, and has arithmetic logic unit, capacitance type sensing assembly and capacitance sensing circuit.Wherein this capacitance sensing circuit is to see through the input of deciding electric current, to carry out the capacitance detecting of this capacitance type sensing assembly, and aforesaid capacitance sensing circuit is to see through the charged state that this arithmetic logic unit starts this capacitance type sensing assembly, and the time that begins to carry out adds up, magnitude of voltage up to this capacitance type sensing assembly reaches a reference voltage level, this arithmetic logic unit obtains to start duration of charging and the difference that reaches the reference voltage level time, converses the capacitance of this capacitance type sensing assembly in order to this arithmetic logic unit to be provided.Last then via the back level calculation of this arithmetic logic unit this capacitance is converted to the physical characteristic information of this fluid, this physical characteristic information can be the arbitrary fluid physics feature that comprises in this concentration of fluid, density and the liquid level.
In addition, this capacitance type sensing assembly can further have one as the capacitance component of standard and the capacitance component of actual this fluid of detecting, and obtains the latter's capacitance through the differential circuit of this capacitance sensing circuit.
Moreover, this liquid measuring device can be located in the fuel storage groove of a fuel cell system, in order to other physical characteristics of the concentration, density, liquid level or the fluid that measure the fuel fluid in this fuel storage groove.
Be familiar with this skill personage and understand purpose of the present invention, feature and effect for making, now by following specific embodiment, and cooperate graphic, to the present invention illustrate in detail as after.
Description of drawings
Fig. 1 is the component liaison figure that shows liquid measuring device of the present invention;
The specific embodiment stereographic map of the shown liquid measuring device of the present invention of Fig. 2;
The associated diagram of the shown liquid measuring device partial component of the present invention of Fig. 3;
Fig. 4 is the circuit diagram of liquid measuring device partial component of the present invention;
Fig. 5 is the signal output map of Fig. 4 of the present invention;
Fig. 6 is the partial component associated diagram of liquid measuring device second specific embodiment of the present invention;
Fig. 7 is the partial component sectional view about the specific embodiment of Fig. 6 of the present invention;
Fig. 8 is the circuit diagram of liquid measuring device partial component of the present invention;
Fig. 9 is the signal output map of Fig. 8 of the present invention;
The circuit diagram of the shown liquid measuring device partial component of the present invention of Figure 10.
The primary clustering symbol description
Fuel cell system (1)
Electric power generating unit (11)
Fuel fluid groove (12)
Accommodation space (12a)
Fuel fluid reservoir (12b)
Capacitance type sensing assembly (2)
Capacitance sensing circuit (3)
Constant current source (31)
Switch module (32)
Voltage comparing component (33)
Timing bench (34)
First electric terminal (A)
Second electric terminal (B)
The 3rd electric terminal (C)
The 4th electric terminal (D)
The 5th electric terminal (E)
The 6th electric terminal (F)
Reference voltage (Vref)
Arithmetic logic unit (4)
Switching signal output port (SW)
The first switching signal output port (SW1)
Second switch signal output port (SW2)
Capacitance type sensing assembly (5)
First capacitance component (51)
Second capacitance component (52)
Capacitance sensing circuit (6)
Constant current source (61)
Constant current source (62)
First switch module (63)
Second switch assembly (64)
Differential voltage amplifier (65)
The 7th electric terminal (G)
The 8th electric terminal (H)
The 9th electric terminal (I)
Differential voltage amplifier circuit (7)
First comparer (71)
Second comparer (72)
First resistor (R1)
Second resistor (R2)
The 3rd resistor (R3)
The 4th resistor (R4)
The 5th resistor (R5)
Display device (8)
Time (t1)
Time (t2)
Time (t3)
Time (t4)
Mistiming (Δ t1)
Mistiming (Δ t2)
Voltage (VA)
Voltage (VD)
Voltage (VG)
Voltage (VH)
Voltage (VI)
Embodiment
Shown with reference to figure 1, it is the component liaison figure of liquid measuring device of the present invention.Liquid measuring device of the present invention is that specific embodiment explains to be used in fuel cell system, one capacitance type sensing assembly (2) is set in one fuel cell system (1), one capacitance sensing circuit (3) and an arithmetic logic unit (4), wherein this capacitance type sensing assembly (2) can react the fuel fluid amount in this fuel cell system (1) and produce corresponding electric signal, and be the electric signal relevant with capacitance by this capacitance sensing circuit (3) with this transform electric, see through the back level calculation that this arithmetic logic unit (4) is carried out this capacitance related electric signal again.
Shown with reference to figure 2, it is the specific embodiment stereographic map of liquid measuring device of the present invention.Being used in the fuel cell system specific embodiment of aforementioned liquid measuring device of the present invention, this fuel cell system (1) further has at least one electric power generating unit (11) and at least one fuel fluid groove (12), wherein this electric power generating unit (11) is to have catalytic substance permission by carrying out electrochemical reaction with hydrogen-rich fuel fluid and oxygen fuel, and then chemical energy is converted to a kind of energy converter that electric energy is exported; And this fuel fluid groove (12) is to store the required fuel fluid of this electric power generating unit (11) electrochemical reaction, and has and supply with the transportation means of fuel fluid to this electric power generating unit (11).Moreover, this capacitance type sensing assembly (2) is to be arranged in the fuel fluid groove (12) of this fuel cell system (1), produce corresponding electric signal in order to the fuel fluid liquid level that reacts this fuel fluid groove (12), this capacitance type sensing assembly (2) is to be electrically connected this capacitance sensing circuit (3), make that this capacitance sensing circuit (3) can be the electric signal relevant with capacitance with this transform electric, and this capacitance sensing circuit (3) is to be electrically connected to this arithmetic logic unit (4), makes that this arithmetic logic unit (4) can be fuel fluid liquid level information with this electric capacity transform electric.
In addition, aforesaid arithmetic logic unit (4) is a fuel fluid liquid level information with this electric capacity transform electric, and this fuel fluid liquid level information can further be output as image information, and is shown in a display device (8).For instance, this display device (8) is a mobile computer, this arithmetic logic unit (4) is electrically connected to the signal I/O port of this display device (8), and with this fuel fluid liquid level information transmission to this mobile computer, make this display device (8) this fuel fluid liquid level information can be exported in any information representation modes such as figure, literal, provide the residual fuel Fluid Volume or the remaining electric power of user's monitor fuel cell system with this.
Shown with reference to figure 3, it is the associated diagram of liquid measuring device partial component of the present invention.As shown in Fig. 3, one specific embodiment of aforementioned capacitance sensing circuit (3) is to have a constant current source (31), a switch module (32), a voltage comparing component (33) and a timing bench (34), and wherein this constant current source (31) is one to provide the driving component of deciding current signal source output; This switch module (32) is the transmission direction of current signal in circuit of this constant current source of selection (31); This voltage comparing component (33) is a signal comparing component, and when the signal voltage of this voltage comparing component (33) of input during greater than a reference voltage level, the output voltage signal of this voltage comparing component (33) can transfer positive potential to by negative potential; And this timing bench (34) be when measuring input signal on this switch module (32) and transfer electronegative potential to by noble potential and this voltage comparing component (33) output signal by negative potential transfer to positive potential between time.Therefore, when this switch module (32) selects the signal source of this constant current source (31) to carry out charging to this capacitance type sensing assembly (2), this timing bench (34) can be removed previous time value of measuring, the voltage of this capacitance type sensing assembly (2) can continue to increase, continue to increase when surpassing the reference voltage level of this voltage comparing component (33) metering of this timing bench (34) stand-by time up to the voltage of this capacitance type sensing assembly (2).Therefore, the cumulative time of the timing bench (34) of this arithmetic logic unit (4) this capacitance sensing circuit of fechtable (3) is to converse the capacitance of this capacitance type sensing assembly (2) and utilize electric capacity to be directly proportional with the duration of charging and close.
Aforesaid capacitance sensing circuit (3) and arithmetic logic unit (4) are to be integrated into general circuit or integrated circuit form.
Shown with reference to figure 4 and Fig. 5, Fig. 4 is the circuit diagram of liquid measuring device partial component of the present invention; And Fig. 5 is the signal output map of Fig. 4 of the present invention.As shown in Fig. 4, in the aforesaid capacitance sensing circuit (3), this constant current source (31) is to be electrically connected to one first electric terminal (A), sees through this first electric terminal (A) again and is electrically connected to this switch module (32), capacitance type sensing assembly (2) and voltage comparing component (33) respectively.Wherein aforesaid arithmetic logic unit (4) has a switching signal output port (SW) and an electric signal input port is electrically connected to one the 6th electric terminal (F), and see through control end and this timing bench (34) that this switching signal output port (SW) is electrically connected to this switch module (32) simultaneously, in order to provide this arithmetic logic unit (4) output control information to this switch module (32) and this timing bench (34); This switch module (32) forms in parallel being electrically connected with capacitance type sensing assembly (2); This voltage comparing component (33) has provides second electric terminal that is electrically connected (B), the 3rd electric terminal (C) and the 4th electric terminal (D), and see through this second electric terminal (B) and be electrically connected to this first electric terminal (A), see through the 3rd electric terminal (C) and be electrically connected to a reference voltage (Vref), and see through the 4th electric terminal (D) and be electrically connected to this timing bench (34), and make that this second electric terminal (B) is that noble potential input port and the 3rd electric terminal (C) are electronegative potential input ports, make that the 4th electric terminal (D) output electric signal transferred positive potential to by negative potential and is sent to this timing bench (34) when this second electric terminal (B) input current potential was higher than the electric signal of the 3rd electric terminal (C); And this timing bench (34) is to have the 4th electric terminal that is electrically connected (D) is provided, the 5th electric terminal (E) and the 6th electric terminal (F), and this timing bench (34) sees through the 4th electric terminal (D) and is electrically connected this voltage comparing component (33), see through the switching signal output port (SW) that the 5th electric terminal (E) is electrically connected to this arithmetic logic unit (4), see through the electric signal input port that the 6th electric terminal (F) is electrically connected this arithmetic logic unit (4), in order to the electric signal of exporting this timing bench (34) to this arithmetic logic unit (4).As shown in Fig. 5, when original state, the switching signal output port (SW) of arithmetic logic unit (4) can be exported the logical signal of a high levle, this switch module this moment (32) meeting conducting, and make stored electric charge on the capacitance type sensing assembly (2) do the action of discharge, and reach the function of the electric capacity of initialization capacitance type sensing assembly (2), when in the time (t1), the conducting state that the logical signal of switching signal output port (SW) input one low level of this arithmetic logic unit (4) is closed this switch module (32), this timing bench (34) can checkout time add up to note down and begin to carry out time accumulative total, make the constant current source (31) of this capacitance sensing circuit (3) continue under the state of output current, electric charge on this capacitance type sensing assembly (2) can continue accumulation charging, and the voltage (VA) of first electric terminal (A) that raise and move closer to the reference voltage (Vref) of this voltage comparing component (33); Moreover, when the time (t2), the stored charge of this capacitance type sensing assembly (2) makes voltage (VA) surpass reference voltage (Vref), make this voltage comparing component (33) transfer positive potential to by the negative potential negative potential and be sent to this timing bench (34) from the 4th electric terminal (D) output voltage (VD), and this timing bench (34) stand-by time accumulative total and the mistiming (Δ t1) of acquisition time (t1) and time (t2); This timing bench (34) is when stand-by time accumulative total at last, the electric signal of mistiming (Δ t1) is transferred to this arithmetic logic unit (4) through the 6th electric terminal (F), in order to the capacitance that provides this arithmetic logic unit (4) to converse this capacitance type sensing assembly (2), and carry out the back level calculation of this arithmetic logic unit (4).
The back level calculation of aforesaid this arithmetic logic unit (4) is to comprise the arbitrary fuel fluid physical features of concentration, liquid level and density that utilizes this capacitance to perform calculations and can obtain fuel fluid.
Shown with reference to figure 6 and Fig. 7, Fig. 6 is the partial component associated diagram of liquid measuring device second specific embodiment of the present invention; And Fig. 7 is the partial component sectional view about the specific embodiment of Fig. 6 of the present invention.As shown in Fig. 6, this embodiment is different from previous embodiment person and has a capacitance type sensing assembly (5), and this capacitance type sensing assembly (5) has first capacitance component (51) and second capacitance component (52).Fig. 7 is shown for another example, first capacitance component (51) of this capacitance type sensing assembly (5) and second capacitance component (52) are that the size with special ratios is arranged at respectively in this fuel fluid groove (12), and the setting of this second capacitance component (52) is to fuel fluid that should fuel fluid groove (12), the setting of this first capacitance component (51) is the fuel fluid of avoiding directly detecting in this fuel fluid groove (12), this first capacitance component (51) is to be provided with corresponding to an accommodation space (12a), this accommodation space (12a) is the partial closure space that can be in this fuel fluid groove (12), and this accommodation space (12a) is not store any fuel fluid, and being correspondence, second capacitance component (52) is arranged at the fuel fluid reservoir (12b) that stores fuel fluid in this fuel fluid groove (12), its objective is the capacitance that first capacitance component (51) can the be measured electric capacity reference value when not having liquid, making second capacitance component (52) can rely on first capacitance component (51) to measure the capacitance that obtains calculates in proportion and is set at initial capacitance value when not having liquid, and in view of the above with this second capacitance component (52) to the fuel fluid amount in should fuel fluid reservoir (12b), and obtain fuel fluid liquid level in this fuel fluid reservoir (12b).
Shown with reference to figure 8 and Fig. 9, Fig. 8 is the circuit diagram of liquid measuring device partial component of the present invention; And Fig. 9 is the signal output map of Fig. 8 of the present invention.As shown in Fig. 8, based on aforesaid second specific embodiment, it is further to have a capacitance sensing circuit (6), and in this capacitance sensing circuit (6), one constant current source (61) is to be electrically connected to one the 7th electric terminal (G) to be electrically connected to one first switch module (63) and this first capacitance component (51) respectively through the 7th electric terminal (G) again, and another constant current source (62) is to be electrically connected to one the 8th electric terminal (H), see through the 8th electric terminal (H) and be electrically connected to a second switch assembly (64) and this second capacitance component (52) respectively, and the 7th electric terminal (G) is imported the port with noble potential input port and electronegative potential that the 8th electric terminal (H) is electrically connected to this differential voltage amplifier (65) respectively.Wherein the output current of this constant current source (61) and constant current source (62) be with the electric capacity that first capacitance component (51) and second capacitance component (52) are measured when not having liquid be direct ratio export the 7th electric terminal (G) and the 8th electric terminal (H) to; This arithmetic logic unit (4) has one first a switching signal output port (SW1) and a second switch signal output port (SW2), this first switching signal output port (SW1) and second switch signal output port (SW2) are electrically connected to the control end of this first switch module (63) and the control end of second switch assembly (64) respectively, make this arithmetic logic unit (4) be exported control information to this first switching signal output port (SW1) and second switch signal output port (SW2); And the information output mouth of this differential voltage amplifier (65) is to be electrically connected to one the 9th electric terminal (I), and see through the 9th electric terminal (I) and be electrically connected to this arithmetic logic unit (4), and make when the 7th electric terminal (G) is distinguished the electric signal of input voltage (VG) and voltage (VH) with the 8th electric terminal (H), the 9th electric terminal (I) output one differential voltage signal (VI) is to this arithmetic logic unit (4), and the increment rate of this differential voltage signal (VI) is that equal proportion is in the difference increment rate of voltage (VG) with voltage (VH).As shown in Fig. 9, when in the time (t3), the conducting state of this first switch module (63) and second switch assembly (64) is closed in first switching signal output port (SW1) of this arithmetic logic unit (4) and second switch signal output port (SW2) input, and this arithmetic logic unit (4) can checkout time accumulative total note down and begin to carry out time accumulative total, make this first capacitance component (51) and second capacitance component (52) can continue charging and the voltage (VH) of the voltage (VG) of the 7th electric terminal (G) that raise and the 8th electric terminal (H); Moreover, when time (t4) of voltage (VG) and voltage (VH) value of reaching capacity, this voltage (VG) is kept definite value with the residual quantity (VI) of voltage (VH), makes this arithmetic logic unit (4) stand-by time accumulative total and the mistiming (Δ t2) of acquisition time (t3) and time (t4); This arithmetic logic unit (4) is when stand-by time accumulative total at last, this arithmetic logic unit (4) is according to the capacitance of mistiming (Δ t2) and this first capacitance component (51), converse the capacitance of this second capacitance component (52), and carry out the back level calculation of this arithmetic logic unit (4).
Shown with reference to Figure 10, it is the circuit diagram of liquid measuring device partial component of the present invention.In the object lesson of the enforcement circuit of earlier figures 8, this differential voltage amplifier (65) can see through voltage comparator circuit means (7) and constitute, and these voltage comparator circuit means (7) comprise one first comparer (71), one second comparer (72), one first resistor (R1), one second resistor (R2), one the 3rd resistor (R3), one the 4th resistor (R4) and one the 5th resistor (R5).Wherein the 7th electric terminal (G) is the noble potential port that is electrically connected to first comparer (71), the 8th electric terminal (H) is the noble potential port that is electrically connected to second comparer (72), the signal output port of this first comparer (71) is to be electrically connected to the 9th electric terminal (I), the electronegative potential port of this first comparer (71), the electronegative potential port of this first resistor (R1) and this second comparer (72) forms being electrically connected of series connection, this second resistor (R2) the end ground connection and the other end are electrically connected to the electronegative potential port of this second comparer (72), the 3rd resistor (R3) end is electrically connected to the electronegative potential port of this second comparer (72) and the signal output port that the other end is electrically connected to this second comparer (72), the 4th resistor (R4) end is electrically connected to the signal output port of this second comparer (72) and the electronegative potential port ground connection that the other end is electrically connected to this first comparer (71), and the 5th resistor (R5) end is electrically connected to the electronegative potential port of this first comparer (71) and the signal output port that the other end is electrically connected to this first comparer (71).Therefore, in the earlier figures 9, the voltage (VG) of the 7th electric terminal (G) can be exaggerated with the difference of the voltage (VH) of the 8th electric terminal (H).
Though aforementioned liquid measuring device of the present invention is to be that specific embodiment explains with the fuel cell system, liquid measuring device of the present invention is the measurement that can be used in various fluids.
Though the present invention discloses as above with specific embodiment; right its disclosed specific embodiment is not in order to limit the present invention; anyly be familiar with this operator; without departing from the spirit and scope of the present invention; when being used for a variety of modifications and variations; its change of doing all belongs to category of the present invention with retouching, and protection scope of the present invention is as the criterion when looking its claim person of defining.
Claims (23)
1. liquid measuring device is characterized in that comprising:
One arithmetic logic unit is characterized in that comprising a switching signal output port, in order to the output control information;
One capacitance type sensing assembly is characterized in that producing in order to the physical quantity of reacting fluid corresponding electric signal; And
One capacitance sensing circuit is characterized in that comprising:
One constant current source is characterized in that comprising constant current source output electric terminal, in order to the electric signal of output constant current source;
One switch module is characterized in that comprising the electronic switch assembly of a control end, a signal input part and a signal output part;
One voltage comparing component is characterized in that comprising noble potential input port, an electronegative potential input port and a signal output port, and the current potential at this electronegative potential input port is a reference voltage level; And
One timing bench is characterized in that the time in order to this voltage comparing component output signal of accumulative total, and comprises:
The signal output part interruption-forming of one electric terminal and this voltage comparing component is electrically connected;
The switching signal output port of another electric terminal and this arithmetic logic unit forms and is electrically connected; And
An electric terminal is that this timing bench of output adds up the time electric information of this voltage comparing component output signal to this arithmetic logic unit again;
Wherein this constant current source is to see through the noble potential input port that this constant current source output electric terminal is electrically connected to signal input part, this capacitance type sensing assembly and this voltage comparing component of this switch module respectively, and the other end of this switch module and capacitance type sensing assembly is a ground connection, and makes this switch module form in parallel being electrically connected with the capacitance type sensing assembly.
2. liquid measuring device according to claim 1, it is characterized in that: when original state, the switching signal output port of this arithmetic logic unit is exported the conducting state that the logical signal of a high levle is opened the signal input part and the signal output part of this switch module, makes this capacitance type sensing assembly discharge; When the very first time, the switching signal output port output information of this arithmetic logic unit is closed the conducting state of the signal input part and the signal output part of this switch module, and the switching signal output port output information of this arithmetic logic unit is removed, and this timing bench time accumulative total is noted down and the time that begins to carry out adds up, make the constant current source of this capacitance sensing circuit continue under the state of input signal, this capacitance type sensing assembly can continue to charge and the magnitude of voltage of first electric terminal that raises and move closer to the reference voltage level of this voltage comparing component; When second time, the magnitude of voltage of this capacitance type sensing assembly surpasses reference voltage level, make the signal output port output voltage signal of this voltage comparing component transfer positive potential to and be sent to this timing bench, make this timing bench stand-by time add up and obtain time difference of the very first time and second time by negative potential; And this timing bench is in stand-by time when accumulative total, and the electric signal of time difference is transferred to this arithmetic logic unit, calculates the pairing physical message of this time difference in order to this arithmetic logic unit to be provided.
3. as liquid measuring device as described in the claim 2, it is characterized in that: this arithmetic logic unit further comprises a back level calculation, and the level calculation of this back is to see through that the capacitance of this capacitance type sensing assembly performs calculations and the physical features that obtains fluid, and this physical features is arbitrary fluid physics feature of selecting in fluid concentrations, fluid density and the fluid level height.
4. liquid measuring device according to claim 1, it is characterized in that: this capacitance sensing circuit and arithmetic logic unit are arbitrary forms of selecting to be integrated in a circuit and the integrated circuit.
5. liquid measuring device according to claim 1, it is characterized in that: this switch module is arbitrary electronic switch assembly of selecting in MOS switch and the transistor switch.
6. liquid measuring device according to claim 1, it is characterized in that: this capacitance type sensing assembly is to be arranged in one of fuel cell system fuel fluid groove, this fuel fluid groove is in order to ccontaining fuel fluid, and this capacitance type sensing assembly is to produce corresponding electric signal in order to the physical quantity of detecting this fuel fluid.
7. as liquid measuring device as described in the claim 6, it is characterized in that: when original state, the switching signal output port of this arithmetic logic unit is exported the conducting state that the logical signal of a high levle is opened the signal input part and the signal output part of this switch module, makes this capacitance type sensing assembly discharge; When the very first time, the switching signal output port output information of this arithmetic logic unit is closed the conducting state of the signal input part and the signal output part of this switch module, and the switching signal output port output information of this arithmetic logic unit is removed, and this timing bench time accumulative total is noted down and the time that begins to carry out adds up, make the constant current source of this capacitance sensing circuit continue under the state of output current, this capacitance type sensing assembly can continue to charge and the magnitude of voltage of first electric terminal that raises and move closer to the reference voltage level of this voltage comparing component; When second time, the magnitude of voltage of this capacitance type sensing assembly surpasses reference voltage level, make the signal output port of this voltage comparing component export a voltage signal, make this timing bench stand-by time add up and obtain time difference of the very first time and second time to this timing bench; And this timing bench is in stand-by time when accumulative total, and the electric signal of time difference is transferred to this arithmetic logic unit, calculates the pairing physical message of this time difference in order to this arithmetic logic unit to be provided.
8. as liquid measuring device as described in the claim 7, it is characterized in that: this arithmetic logic unit further comprises a back level calculation, and the level calculation of this back is to see through that the capacitance of this capacitance type sensing assembly performs calculations and the physical features that obtains fuel fluid, and this physical features is arbitrary fuel fluid physical features of selecting in fuel fluid concentration, fuel fluid density and the fuel fluid liquid level.
9. liquid measuring device according to claim 1, it is characterized in that: this arithmetic logic unit is a fuel fluid liquid level information with this electric capacity transform electric, and this fuel fluid liquid level information can further be output as image information, and is shown in a display device.
10. as liquid measuring device as described in the claim 9, it is characterized in that: this display device is a computer system, this arithmetic logic unit is the signal I/O port that is electrically connected to this display device of computer system, and with this fuel fluid liquid level information transmission to this mobile computer, make this display device to provide the residual fuel Fluid Volume or the remaining electric power of user's monitor fuel cell system with this with this fuel fluid liquid level information with figure or the output of Word message expression way.
11. a liquid measuring device is characterized in that comprising:
One arithmetic logic unit is characterized in that comprising one first a switching signal output port and a second switch signal output port, respectively in order to the output control information;
One capacitance type sensing assembly is characterized in that comprising first capacitance component and second capacitance component, and those capacitance components are to react the change of peripheral material respectively and form corresponding capacitor specific characteristics; And
One capacitance sensing circuit is characterized in that comprising:
One first constant current source is characterized in that comprising one first constant current source output electric terminal, in order to the electric signal of output constant current source;
One second constant current source is characterized in that comprising one second constant current source output electric terminal, in order to the electric signal of output constant current source;
One first switch module is characterized in that comprising the electronic switch assembly of a control end, a signal input part and a signal output part;
One second switch assembly is characterized in that comprising the electronic switch assembly of a control end, a signal input part and a signal output part;
One differential voltage amplifier is characterized in that comprising noble potential input port, an electronegative potential input port and a signal output port, and
One timing bench is characterized in that the time in order to this differential voltage amplifier output signal of accumulative total, and comprises:
The signal output part interruption-forming of one first electric terminal and this differential voltage amplifier is electrically connected;
First switching signal output port of one second electric terminal and one the 3rd electric terminal and this arithmetic logic unit and second switch signal output port form respectively and are electrically connected; And
One the 4th electric terminal is that this timing bench of output adds up the time electric information of this voltage comparing component output signal to this arithmetic logic unit;
Wherein this first constant current source is to see through this first constant current source output electric terminal and this second constant current source is to see through the signal input part that this second constant current source output electric terminal is electrically connected to this first switch module respectively, the signal input part of this second switch assembly, this first capacitance type sensing assembly, this second capacitance type sensing assembly, the electronegative potential input port of this differential voltage amplifier and the noble potential of this differential voltage amplifier input port, and the other end ground connection of those switch modules and those capacitance type sensing assemblies, and make this first switch module and this first capacitance type sensing assembly form in parallel being electrically connected, and this second switch assembly forms in parallel being electrically connected with this second capacitance type sensing assembly.
12. as liquid measuring device as described in the claim 11, it is characterized in that: this first capacitance sensing assembly and this second capacitance sensing assembly are to have specific dimension scale respectively, make that the electric capacity of this first capacitance sensing assembly and this second capacitance sensing assembly is to correspond to a special ratios size.
13. as liquid measuring device as described in the claim 12, it is characterized in that: the magnitude of current of this first constant current source and this second current source is to set with the electric capacity ratio between this first capacitance sensing assembly and this second capacitance sensing assembly.
14. as liquid measuring device as described in the claim 11, it is characterized in that: when original state, each switching signal output port of this arithmetic logic unit is exported the logical signal of a high levle respectively and the conducting state of opening the signal input part and the signal output part of each switch module, makes those capacitance type sensing assemblies discharge; When the very first time, each switching signal output port of this arithmetic logic unit output information is respectively closed the conducting state of the signal input part and the signal output part of this each switch module, and the switching signal output port output information of this arithmetic logic unit is removed this timing bench time accumulative total and noted down and begin to carry out time accumulative total.
15. as liquid measuring device as described in the claim 11, wherein capacitance sensing circuit is when the very first time, the switching signal output port output information of this arithmetic logic unit is closed the conducting state and the conducting state of closing the signal input part and the signal output part of second switch assembly of the signal input part and the signal output part of this first switch module, and this arithmetic logic unit checkout time accumulative total is noted down and is begun to carry out time accumulative total, makes this first capacitance component and second capacitance component can continue to charge and the voltage of second electric terminal that raises and the voltage of the 3rd electric terminal; When second time, this second electric terminal voltage and the 3rd electric terminal voltage value of reaching capacity, the residual quantity of this second electric terminal voltage and the 3rd electric terminal voltage is kept definite value, makes this arithmetic logic unit stand-by time add up and obtain time difference of the very first time and second time; And this arithmetic logic unit is in stand-by time when accumulative total, and this arithmetic logic unit converses the capacitance of this second capacitance component according to the capacitance of this time difference and this first capacitance component.
16. as liquid measuring device as described in the claim 11, it is characterized in that: this arithmetic logic unit further comprises a back level calculation, and the level calculation of this back is to see through that the capacitance of second capacitance component of this capacitance type sensing assembly performs calculations and the physical features that obtains fuel fluid, and this physical features is arbitrary fuel fluid physical features of selecting in fuel fluid concentration, fuel fluid density and the fuel fluid liquid level.
17. as liquid measuring device as described in the claim 11, it is characterized in that: this capacitance sensing circuit and arithmetic logic unit are arbitrary forms of selecting to be integrated in a circuit and the integrated circuit.
18. as liquid measuring device as described in the claim 11, it is characterized in that: this voltage comparing component is a differential voltage amplifier circuit, and further comprises one first comparer, one second comparer, one first resistor, one second resistor, one the 3rd resistor, one the 4th resistor and one the 5th resistor;
It is characterized in that: this second electric terminal is the noble potential port that is electrically connected to this first comparer, the 3rd electric terminal is electrically connected to the noble potential port of second comparer, the signal output port of this first comparer is to be electrically connected to second electric terminal, the electronegative potential port of this first comparer, the electronegative potential port of this first resistor and this second comparer forms being electrically connected of series connection, this second resistor, the one end ground connection and the other end are electrically connected to the electronegative potential port of this second comparer, the 3rd resistor one end is electrically connected to the electronegative potential port of this second comparer and the signal output port that the other end is electrically connected to this second comparer, the 4th resistor one end is electrically connected to the signal output port of this second comparer and the electronegative potential port ground connection that the other end is electrically connected to this first comparer, and the 5th resistor one end is electrically connected to the electronegative potential port of this first comparer and the signal output port that the other end is electrically connected to this first comparer.
19. as liquid measuring device as described in the claim 11, it is characterized in that: this voltage comparing component is the difference in order to the voltage of voltage that amplifies this second electric terminal and the 3rd electric terminal.
20. as liquid measuring device as described in the claim 11, it is characterized in that: this capacitance sensing circuit and arithmetic logic unit are arbitrary forms of selecting to be integrated in a circuit and the integrated circuit.
21. as liquid measuring device as described in the claim 11, wherein this first capacitance component is to be provided with corresponding to an accommodation space, this accommodation space is the partial closure space that can be in this fuel fluid groove, and this accommodation space is not store any fuel fluid, and being correspondence, second capacitance component is arranged at the fuel fluid reservoir that stores fuel fluid in this fuel fluid groove, its objective is the capacitance that first capacitance component can the be measured electric capacity reference value when not having liquid, the capacitance that makes second capacitance component can rely on first capacitance component to measure to obtain calculates in proportion and is set at initial capacitance value when not having liquid
22. as liquid measuring device as described in the claim 11, it is characterized in that: this arithmetic logic unit is a fuel fluid liquid level information with this electric capacity transform electric, and this fuel fluid liquid level information can further be output as image information, and is shown in a display device.
23. as liquid measuring device as described in the claim 22, it is characterized in that: this display device is a computer system, this arithmetic logic unit is the signal I/O port that is electrically connected to this display device of computer system, and with this fuel fluid liquid level information transmission to this mobile computer, make this display device to provide the residual fuel Fluid Volume or the remaining electric power of user's monitor fuel cell system with this with this fuel fluid liquid level information with figure or the output of Word message expression way.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101525002A CN101162212B (en) | 2006-10-09 | 2006-10-09 | Liquid measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101525002A CN101162212B (en) | 2006-10-09 | 2006-10-09 | Liquid measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101162212A true CN101162212A (en) | 2008-04-16 |
| CN101162212B CN101162212B (en) | 2010-10-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101525002A Expired - Fee Related CN101162212B (en) | 2006-10-09 | 2006-10-09 | Liquid measuring device |
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| Country | Link |
|---|---|
| CN (1) | CN101162212B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102449442A (en) * | 2009-05-26 | 2012-05-09 | 埃尔泰克股份公司 | Level sensor and associated control circuit, in particular for a filter for vehicles |
| US8281655B2 (en) | 2009-04-03 | 2012-10-09 | Eaton Corporation | Fuel gauging system utilizing a digital fuel gauging probe |
| CN103580487A (en) * | 2012-08-10 | 2014-02-12 | 通嘉科技股份有限公司 | Sampling maintaining circuit and method for generating variable sampling delay time of transformer |
| US10401209B2 (en) | 2016-06-22 | 2019-09-03 | Abbott Laboratories | Liquid level sensing apparatus and related methods |
| CN112439082A (en) * | 2020-11-10 | 2021-03-05 | 珠海格力电器股份有限公司 | Concentration detection circuit, disinfectant manufacturing machine and control method thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87201239U (en) * | 1987-04-13 | 1987-12-02 | 顾震环 | Portable liquid-level gauge for ship |
| US5049825A (en) * | 1989-12-21 | 1991-09-17 | Simmonds Precision Products, Inc. | System and method of error reduction for differential capacitive transducers |
| CN1152253C (en) * | 1999-02-23 | 2004-06-02 | 王劲松 | Detecting method and apparatus for yeast concentration (measuring bioconcentration) |
| CN2493915Y (en) * | 2001-07-26 | 2002-05-29 | 杭州中成自动化控制技术有限公司 | Capacitance water level measurer |
| US6744036B2 (en) * | 2002-10-01 | 2004-06-01 | Simmonds Precision Products, Inc. | Optically coupled sensor for application to combustible liquids |
| CN2611879Y (en) * | 2003-04-18 | 2004-04-14 | 汤发明 | Capacitor type level transducer |
-
2006
- 2006-10-09 CN CN2006101525002A patent/CN101162212B/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8281655B2 (en) | 2009-04-03 | 2012-10-09 | Eaton Corporation | Fuel gauging system utilizing a digital fuel gauging probe |
| CN102449442A (en) * | 2009-05-26 | 2012-05-09 | 埃尔泰克股份公司 | Level sensor and associated control circuit, in particular for a filter for vehicles |
| CN102449442B (en) * | 2009-05-26 | 2017-03-01 | 埃尔泰克股份公司 | It is used in particular for the liquid level sensor of vehicle filtering device and associated control circuit |
| CN103580487A (en) * | 2012-08-10 | 2014-02-12 | 通嘉科技股份有限公司 | Sampling maintaining circuit and method for generating variable sampling delay time of transformer |
| US10401209B2 (en) | 2016-06-22 | 2019-09-03 | Abbott Laboratories | Liquid level sensing apparatus and related methods |
| US10760939B2 (en) | 2016-06-22 | 2020-09-01 | Abbott Laboratories | Liquid level sensing apparatus and related methods |
| CN112439082A (en) * | 2020-11-10 | 2021-03-05 | 珠海格力电器股份有限公司 | Concentration detection circuit, disinfectant manufacturing machine and control method thereof |
| CN112439082B (en) * | 2020-11-10 | 2022-04-26 | 珠海格力电器股份有限公司 | Concentration detection circuit, disinfectant manufacturing machine and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101162212B (en) | 2010-10-20 |
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