CN201569469U - Digital capacitance type liquid level measurement sensor - Google Patents
Digital capacitance type liquid level measurement sensor Download PDFInfo
- Publication number
- CN201569469U CN201569469U CN2009201880179U CN200920188017U CN201569469U CN 201569469 U CN201569469 U CN 201569469U CN 2009201880179 U CN2009201880179 U CN 2009201880179U CN 200920188017 U CN200920188017 U CN 200920188017U CN 201569469 U CN201569469 U CN 201569469U
- Authority
- CN
- China
- Prior art keywords
- electrode
- pin
- liquid level
- microcontroller
- stilt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 29
- 238000005259 measurement Methods 0.000 title abstract description 8
- 239000000523 sample Substances 0.000 claims abstract description 17
- 241000272165 Charadriidae Species 0.000 claims description 20
- 239000002184 metal Substances 0.000 claims description 19
- 229910052751 metal Inorganic materials 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 102100025848 Acyl-coenzyme A thioesterase 8 Human genes 0.000 claims description 6
- 101000720381 Homo sapiens Acyl-coenzyme A thioesterase 8 Proteins 0.000 claims description 6
- 102100028680 Protein patched homolog 1 Human genes 0.000 claims description 6
- 101710161390 Protein patched homolog 1 Proteins 0.000 claims description 6
- 102100025851 Acyl-coenzyme A thioesterase 2, mitochondrial Human genes 0.000 claims description 3
- 101100107935 Homo sapiens ACOT2 gene Proteins 0.000 claims description 3
- 101100107938 Mus musculus Acot3 gene Proteins 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 18
- 239000010410 layer Substances 0.000 description 12
- 239000002828 fuel tank Substances 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005530 etching Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Images
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The utility model relates to the field of the liquid level measurement, in particular to a digital capacitance type liquid level measurement sensor. The liquid level measurement sensor comprises a capacitance probe, a data acquisition circuit, a data receiving circuit and a display, wherein the output of the capacitance probe is connected with the data acquisition circuit; the output of the data receiving circuit is connected with the display; and the data acquisition circuit is connected with the data receiving circuit by the CAN network and the LIN network. The liquid level measurement sensor overcomes the defects of inaccurate reading and limited service life in the prior art and has accurate reading and long service life, and the oil quantity display can be integrated with other parameters such as the speed per hour and the temperature display.
Description
Technical field
The utility model relates to chemical industry, oil, the digital capacitance type liquid level measuring sensor that relevant liquid level fields of measurement such as water level is used.
Background technology
Liquid level sensor has throw-in type liquid level sensor (rod-type, cable formula), flange form liquid level sensor (single flange, two flange) and magnetic turnover panel liquid level sensor and Floating Ball Liquid Level sensor etc.According to different environmental requirements, can select corresponding sensor for use, what be used for the automotive oil tank oil measurement at present mostly is the float-type liquid level sensor.Its measuring principle is to drop into float in liquid, and float can drive variable-resistance change in resistance according to the variation of liquid level, controls display again according to the size variation of electric current in the circuit, obtains real-time level value.Because the core component of float-type liquid level sensor is a variable resistor, do mechanical motion and be directly exposed in the fuel oil with liquid level change, the long-term use causes the reading error that obtains bigger, the shortcoming of such sensor is the reading out of true, serviceable life is short, and the driver can't accurately grasp current accurate oil mass.
The oil mass of automobile shows it is the indication of utilization pointer substantially now, and scale is not careful, can only probably react current oil mass, the vehicle body vibrations also can make pointer deflect in vehicle traveling process, the target that numeral shows is to replace the pointer indication with the exact figure reading, make the driver be easy to learn current oil mass, grasp the temperature in the fuel tank, know when this refuels a car.Along with the development of automotive electronicsization, digital instrument becomes the trend of electronization development, oil mass show need and other as speed per hour, temperature shows integrated, so that reduce cost the raising performance.
The utility model content
Technical problem to be solved in the utility model provides the digital capacitance type liquid level measuring sensor that a kind of reading precise figures show.
The technical scheme that the utility model adopted is: digital capacitance type liquid level measuring sensor, comprise capacitance probe, and data acquisition circuit, data receiver circuit and display, wherein:
The output of capacitance probe connects data acquisition circuit, and the output of data receiver circuit connects display, is connected with the LIN network by CAN between data acquisition circuit and the data receiver circuit.
Capacitance probe comprises: stilt, first electrode, 2, the second electrodes 3, third electrode 4, electrode protecting layer, inner lead 6, inner lead 7, inner lead 8, metal aperture 9, metal aperture 10, metal aperture 11;
Electrode protecting layer covers electrode surface, distribution of electrodes is on the stilt surface, it is right that first electrode 2 and second electrode 3 are formed potential electrode, it is right that first electrode 2 and third electrode 4 are formed contrast electrode, potential electrode is to being on the same straight line shared first electrode, 2, the second electrodes 3 and third electrode 4 with contrast electrode and parallel with first electrode 2; Stilt is divided into 5 layers, and inner lead 6 is positioned at the second layer of stilt, and is parallel with first electrode 2, and both link to each other by metal aperture 9; Inner lead 7 is positioned at the 3rd layer of stilt, and is parallel with second electrode 3, and both link to each other by metal aperture 10; Inner lead 8 is positioned at the 4th layer of stilt, and is parallel with third electrode 4, and both link to each other by metal aperture 11.
Adopt CDC conversion chip AD7746 in the data acquisition circuit, gather microcontroller MC68HC908GZ16, CAN transceiver MC33388, LIN transceiver MC33399;
Gather the PTE2 pin of microcontroller MC68HC908GZ16 and the SCL pin of AD7746 and link to each other, the PTE3 pin links to each other with the SDA pin; Gather the PTC0/CANTX pin of microcontroller MC68HC908GZ16 and the TX pin of CAN transceiver MC33388 and link to each other, the PTC1/CANRX pin links to each other with the RX pin; Gather the PTE0/TXD pin of microcontroller MC68HC908GZ16 and the TXD pin of LIN transceiver MC33399 and link to each other, the PTE1/RXD pin links to each other with the RXD pin.
Adopt data microcontroller MC68HC908GZ16 in the data receiver circuit, CAN transceiver MC33388, LIN transceiver MC33399;
The PTC0/CANTX pin of data microcontroller MC68HC908GZ16 and the TX pin of MC33388 link to each other, and the PTC1/CANRX pin links to each other with the RX pin; The PTE0/TXD pin of MC68HC908GZ16 and the TXD pin of MC33399 link to each other, and the PTE1/RXD pin links to each other with the RXD pin.
Display adopts LCD.
Good effect of the present utility model is: 1, reading is accurate, long service life.2, replace the pointer indication with the exact figure reading, make the driver be easy to learn current oil mass.3, oil mass show can with other as speed per hour, temperature shows integrated.
Description of drawings
Fig. 1 is the schematic diagram of capacitance probe,
Fig. 2 is the composite diagram of capacitance probe A-A and B-B section,
Fig. 3 is data acquisition circuit figure,
Fig. 4 is data receiver circuit figure,
Fig. 5 is integrated circuit figure,
Fig. 6 is an overall block-diagram.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
Capacitance level transducer be use the size of capacitance and electrode over against area, the specific inductive capacity of medium is relevant between spacing and electrode, wherein two amounts are constant when keeping, when changing the 3rd amount, this principle that thereupon changes capacitance realizes, along with microelectromechanical systems (MEMS) process technology is day by day ripe, we can make capacitance electrode on silicon chip, can form large-scale array, obtain high precision, the sensor of low energy consumption makes cost reduce, and more is applicable to batch process.
The utility model provides a kind of new digital capacitance type liquid level measuring sensor based on the MEMS technology, can be used for the level gauging of automotive oil tank, also can be used in chemical industry, oil, the field of the level gauging that water level etc. are relevant.The sensor capacitance probe can adopt the MEMS processes to obtain.
As shown in Figure 6, digital capacitance type liquid level measuring sensor comprises capacitance probe 19, data acquisition circuit 20, data receiver circuit 21 and display 22.
The output of capacitance probe 19 connects data acquisition circuit 20, and the output of data receiver circuit 21 connects display 22, is connected with the LIN network by CAN between data acquisition circuit 20 and the data receiver circuit 21.
As shown in Figure 1 and Figure 2, capacitance probe comprises: stilt 1, the first electrode 2, the second electrodes 3, third electrode 4, electrode protecting layer 5, inner lead 6, inner lead 7, inner lead 8, metal aperture 9, metal aperture 10, metal aperture 11.Wherein electrode protecting layer 5 covers electrode surface, and distribution of electrodes is on stilt 1 surface, and electrode pair adopts the broach shape, and electrode adopts parallel form on the same group, and concrete broach number can be done corresponding the adjustment according to the scope of measuring.It is right that first electrode 2 and second electrode 3 are formed potential electrode, and it is right that first electrode 2 and third electrode 4 are formed contrast electrodes, and two kinds of shared one group of first electrode, 2, the second electrodes 3 of electrode and third electrode 4 are on same the straight line and are parallel with first electrode 2.Stilt can be divided into 5 layers from top to bottom, adopts same material.Inner lead 6 is positioned at the second layer of stilt, and is parallel with first electrode 2, and both link to each other by metal aperture 9; Inner lead 7 is positioned at the 3rd layer of stilt, and is parallel with second electrode 3, and both link to each other by metal aperture 10; Inner lead 8 is positioned at the 4th layer of stilt, and is parallel with third electrode 4, and both link to each other by metal aperture 11.The influence that contrast electrode produces potential electrode compensated fuel specific inductive capacity and temperature variation automatically.During measuring liquid level capacitance probe is vertically inserted in the fuel tank, contrast electrode when liquid level is lower than contrast electrode to the upper end, will produce alerting signal on the display to being positioned at bottom half, reminds the driver to refuel.
As Fig. 3, shown in Figure 5, data acquisition circuit is gathered microcontroller (MC68HC908GZ16) 13 mainly by CDC conversion chip (AD7746) 12, CAN transceiver (MC33388) 14, and LIN transceiver (MC33399) 15 is formed.Gather microcontroller MC68HC908GZ16 internal programmable, can deal with data, also can control other chip.CDC conversion chip AD7746 has two electric capacity input ports, can directly capacitance be changed into digital signal, and the temperature sensor that carries can be used to measure the fuel tank internal temperature.Vehicle body mainly adopts the CAN network to communicate at present, the LIN network can be used as the auxiliary of CAN network and is used in the idling slow speed system, save cost, using two kinds of transceivers here is for more rational transmission and video data, selects idle network to carry out data transmission when specifically using.
Gather the PTE2 pin of microcontroller (MC68HC908GZ16) 13 and the SCL pin of CDC conversion chip (AD7746) 12 and link to each other, the PTE3 pin links to each other with the SDA pin; Gather the PTC0/CANTX pin of microcontroller (MC68HC908GZ16) 13 and the TX pin of CAN transceiver (MC33388) 14 and link to each other, the PTC1/CANRX pin links to each other with the RX pin; Gather the PTE0/TXD pin of microcontroller (MC68HC908GZ16) 13 and the TXD pin of LIN transceiver (MC33399) 15 and link to each other, the PTE1/RXD pin links to each other with the RXD pin.Send by CAN network or LIN network through after the internal arithmetic by the digital signal of above connected mode microcontroller CDC conversion chip AD7746 output.
As Fig. 4, shown in Figure 5, data receiver circuit is mainly by data microcontroller (MC68HC908GZ16) 16, CAN transceiver (MC33388) 17, and LIN transceiver (MC33399) 18 is formed.
The PTC0/CANTX pin of data microcontroller (MC68HC908GZ16) 16 links to each other with the TX pin of CAN transceiver (MC33388) 17, and the PTC1/CANRX pin links to each other with the RX pin; The PTE0/TXD pin of data microcontroller (MC68HC908GZ16) 16 links to each other with the TXD pin of LIN transceiver (MC33399) 18, and the PTE1/RXD pin links to each other with the RXD pin.Microcontroller selects idle CAN or LIN network system to come received signal by above connected mode.Output is digital signal at last, can directly offer liquid crystal display displays.
Concrete manufacturing process steps of the present utility model is as follows:
(1) at first etching inner lead and metal aperture on stilt, stilt adopts insulating material;
(2) treat that lead-in wire finishes the back at surface sputtering copper, etching generation electrode pair;
(3) at electrode pair surface deposition insulating protective layer, guard electrode is right;
(4) make printed circuit board (PCB), the line of data acquisition circuit and capacitance probe is connected the back overall package;
(5) the data receiving circuit is encapsulated, give LCD output signal;
(6) pass through vehicle body CAN/LIN Network Transmission signal between data acquisition circuit and the receiving circuit.Total system is finished.
The utility model can be used for a plurality of fields of level gauging, when specifically using the automobile oil mass measurement, with existing product ratio, can be accurately on liquid crystal display the oil mass value in the display automobile fuel tank in real time, show each oil mass value of refueling in real time, show in real time vehicle fuel consumption per hundred kilometers value, the oil mass mileage of can continuing a journey in the real-time prompting fuel tank, low oil mass is reported to the police; Remind the driver to refuel.Probe adopts the form of electric capacity, and reading is accurate, and increase serviceable life, and it is good to record oil mass value continuity, and the mode of liquid crystal display is more conducive to other demonstration integrated, and cost reduces.
Claims (5)
1. digital capacitance type liquid level measuring sensor comprises capacitance probe (19), data acquisition circuit (20), and data receiver circuit (21) and display (22) is characterized in that:
The output of capacitance probe (19) connects data acquisition circuit (20), and the output of data receiver circuit (21) connects display (22), is connected with the LIN network by CAN between data acquisition circuit (20) and the data receiver circuit (21).
2. digital capacitance type liquid level measuring sensor according to claim 1 is characterized in that:
Described capacitance probe (19) comprising: stilt (1), first electrode (2), second electrode (3), third electrode (4), electrode protecting layer (5), inner lead (6), inner lead (7), inner lead (8), metal aperture (9), metal aperture (10), metal aperture (11);
Electrode protecting layer (5) covers electrode surface, distribution of electrodes is on stilt (1) surface, it is right that first electrode (2) and second electrode (3) are formed potential electrode, it is right that first electrode (2) and third electrode (4) are formed contrast electrode, potential electrode to contrast electrode to shared first electrode (2), second electrode (3) and third electrode (4) are on the same straight line and are parallel with first electrode (2); Stilt is divided into 5 layers, and inner lead (6) is positioned at the second layer of stilt, and is parallel with first electrode (2), and both link to each other by metal aperture (9); Inner lead (7) is positioned at the 3rd layer of stilt, and is parallel with second electrode (3), and both link to each other by metal aperture (10); Inner lead (8) is positioned at the 4th layer of stilt, and is parallel with third electrode (4), and both link to each other by metal aperture (11).
3. digital capacitance type liquid level measuring sensor according to claim 1 and 2 is characterized in that:
Adopt CDC conversion chip AD7746 (12) in the described data acquisition circuit (20), gather microcontroller MC68HC908GZ16 (13), CAN transceiver MC33388 (14), LIN transceiver MC33399 (15);
Gather the PTE2 pin of microcontroller MC68HC908GZ16 (13) and the SCL pin of CDC conversion chip AD7746 (12) and link to each other, the PTE3 pin links to each other with the SDA pin; Gather the PTC0/CAN of microcontroller MC68HC908GZ16 (13)
TXPin links to each other PTC1/CAN with the TX pin of CAN transceiver MC33388 (14)
RXPin links to each other with the RX pin; Gather the PTE0/TXD pin of microcontroller MC68HC908GZ16 (13) and the TXD pin of LIN transceiver MC33399 (15) and link to each other, the PTE1/RXD pin links to each other with the RXD pin.
4. digital capacitance type liquid level measuring sensor according to claim 1 and 2 is characterized in that:
Adopt data microcontroller MC68HC908GZ16 (16), CAN transceiver MC33388 (17), LIN transceiver MC33399 (18) in the described data receiver circuit (21);
The PTC0/CAN of data microcontroller MC68HC908GZ16 (16)
TXPin links to each other PTC1/CAN with the TX pin of MC33388 (17)
RXPin links to each other with the RX pin; The PTE0/TXD pin of MC68HC908GZ16 (16) links to each other with the TXD pin of MC33399 (18), and the PTE1/RXD pin links to each other with the RXD pin.
5. digital capacitance type liquid level measuring sensor according to claim 1 and 2 is characterized in that: described display (22) adopts LCD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201880179U CN201569469U (en) | 2009-09-24 | 2009-09-24 | Digital capacitance type liquid level measurement sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201880179U CN201569469U (en) | 2009-09-24 | 2009-09-24 | Digital capacitance type liquid level measurement sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201569469U true CN201569469U (en) | 2010-09-01 |
Family
ID=42661762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201880179U Expired - Lifetime CN201569469U (en) | 2009-09-24 | 2009-09-24 | Digital capacitance type liquid level measurement sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201569469U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108473141A (en) * | 2015-12-04 | 2018-08-31 | 奥迪股份公司 | The method and motor vehicle of course continuation mileage for determining motor vehicle |
-
2009
- 2009-09-24 CN CN2009201880179U patent/CN201569469U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108473141A (en) * | 2015-12-04 | 2018-08-31 | 奥迪股份公司 | The method and motor vehicle of course continuation mileage for determining motor vehicle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101692005B (en) | Digital capacitive liquid level measurement sensor | |
| CN101738240B (en) | Capacitance sensing type fuel meter | |
| CN201672957U (en) | Automobile fuel meter digitalized device | |
| CN102778268B (en) | Integrated measurement system for indirectly measuring oil consumption of vehicular fuel oil | |
| CN201569469U (en) | Digital capacitance type liquid level measurement sensor | |
| CN104848915A (en) | Implementation method of capacitance liquid level sensor with high accuracy, self-adaptation performance and large measurement range | |
| CN105136250A (en) | Oil level detection device and detection method for fuel oil tank | |
| CN107907175B (en) | Marine diesel engine oil consumption comparison metering method and high-precision measuring system | |
| CN201382799Y (en) | Capacity transduction type fuel oil metering instrument | |
| CN202101733U (en) | Detection device of automobile oil level | |
| CN100334434C (en) | Digital method for measuring quantity of fuel oil in fuel tank of motor vehicle, and metering device | |
| CN201852605U (en) | A Vehicle Fuel Consumption Totalizer Based on Communication Network | |
| CN202319936U (en) | Combined instrument device of motorcycle | |
| CN103196507A (en) | Automobile oil tank oil consumption monitoring device and automobile | |
| CN201011498Y (en) | Automobile electronic instrument board | |
| CN106595805A (en) | Method for measuring fuel quantity of fuel tank of vehicle | |
| CN100507457C (en) | Motor Vehicle Electronic Instrument Panel | |
| CN200941061Y (en) | Oil gage of autocar fuel tank | |
| CN115099001A (en) | Design method for relationship between fuel gauge display and resistance value, fuel detection system and vehicle | |
| CN201573548U (en) | Automobile electronic combination meter | |
| CN2470176Y (en) | Digital display instrument for oil quantity special for automobile | |
| CN202528848U (en) | Automobile electronic combination instrument | |
| CN203100819U (en) | Automobile fuel quantity measuring device | |
| CN2484212Y (en) | Vehicle fuel-tank level sensor | |
| CN201852616U (en) | A car remaining fuel indicator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100901 Effective date of abandoning: 20090924 |