CN102980634A - Reed switch transducer control circuit for liquid-level measurement purpose - Google Patents
Reed switch transducer control circuit for liquid-level measurement purpose Download PDFInfo
- Publication number
- CN102980634A CN102980634A CN2012101867170A CN201210186717A CN102980634A CN 102980634 A CN102980634 A CN 102980634A CN 2012101867170 A CN2012101867170 A CN 2012101867170A CN 201210186717 A CN201210186717 A CN 201210186717A CN 102980634 A CN102980634 A CN 102980634A
- Authority
- CN
- China
- Prior art keywords
- circuit
- voltage
- smoothing
- control circuit
- tongue tube
- 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.)
- Pending
Links
Images
Abstract
The invention discloses a reed switch transducer control circuit for liquid-level measurement purpose. The reed switch transducer control circuit for the liquid-level measurement purpose comprises a plurality of reed switch resistors in series connection with each other. A normally open switch is parallelly connected between every two of the resistors. The other end of each normally open switch is connected to a smooth circuit. The output end of the smooth circuit is respectively connected to a voltage buffer and a voltage simulator. When a floater on a reed switch transducer rises along with the rising of oil level, the normally open switches are closed in sequence. Different partial pressure electric signals are output to the smooth circuit. The signals of different partial pressure points are respectively input to the voltage buffer and the voltage simulator through the smooth circuit. The control circuit is capable of reflecting oil filling capacity precisely and rapidly, and avoiding the fact that one numerical value is directly changed into another numerical value when a displayer displays values.
Description
Technical field
The invention belongs to checkout equipment, especially relate to a kind of survey liquid level tongue tube sensor control circuit.
Background technology
Petroleum product has been deep in our daily life now, no matter they are all playing the part of important role in medical science, chemical industry and new material exploitation, wherein close with us has been gasoline.According to South Daily, April 13, refueled the Mrs Qiu refuelling station, South Lake, Gaozhou county of driving, and I had never expected that 280.04 yuan No. 93 " gasoline " adding only have 60 yuan to be pure gasoline, and remaining is water unexpectedly entirely.Report that again the time and again water mixing in the gasoline of a refuelling station of Zhengzhou High-tech Industrial Development Zone not only makes the car owner pay for oily money, therefore engine also may damage.And in recent years along with the rise at full speed of oil price, be further intensified especially in order to obtain larger interests in those evil mind refuelling stations, so that the generation of this type of event is more and more frequent.By the observation in the daily life and analysis, cause the basic reason of this type of event to be that the design of automobile tradition fuel tank is unreasonable, this irrational design is not so that the car owner has clear and definite right to know to vehicle institute volume read-out, add gasoline actual label just said nothing of.
Summary of the invention
Technical matters to be solved by this invention provides a kind of survey liquid level tongue tube sensor control circuit, can accurately survey the oil mass that vehicle refuels.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
A kind ofly survey between liquid level comprises a plurality of mutual series connection with the tongue tube sensor control circuit tongue tube resistance, resistance all and be connected to a normal open switch, the other end of each normal open switch is connected to a smoothing circuit, the smoothing circuit output terminal is connected to respectively voltage buffer and voltage analog device, raise along with oil level and rise when being sheathed on float on the tongue tube sensor, closed normal open switch successively, export different minute piezoelectric signals to smoothing circuit, again the signal of different dividing points is inputed to respectively voltage buffer and voltage analog device by smoothing circuit.
Described smoothing circuit comprises smoothing resistor and smoothing capacity, and smoothing resistor one end links to each other with the output terminal of normal open switch, and the other end links to each other with smoothing capacity, smoothing capacity other end ground connection.
Adopt survey liquid level tongue tube sensor control circuit of the present invention, have following advantage:
1. according to different liquid levels, export different minute piezoelectric signals, thus the reflection volume read-out.
2. can make the voltage rising by smoothing circuit, thereby directly change another numerical value into by a numerical value in the time of can avoiding the display registration.
Description of drawings
The present invention is elaborated below in conjunction with the drawings and specific embodiments:
Fig. 1 is the structural representation that survey liquid level of the present invention is used the tongue tube sensor control circuit.
Fig. 2 is a part of control circuit figure of tongue tube sensor of the present invention.
Fig. 3 is another part control circuit figure of tongue tube sensor of the present invention.
Fig. 4 is the level gauging circuit diagram of main circuit of the present invention.
Fig. 5 is a part of control circuit figure of capacitive transducer of the present invention.
Fig. 6 is another part control circuit figure of capacitive transducer of the present invention.
Fig. 7 is the power circuit diagram of main circuit of the present invention.
Fig. 8 is the gasoline label testing circuit figure of main circuit of the present invention.
Embodiment
As shown in Figure 1, survey liquid level of the present invention mainly comprises fuel reserve tank 1 with the tongue tube sensor control circuit, end cap 2, tongue tube sensor 3, capacitive transducer 4 and display 5, end cap 2 is provided with and is funnelform and advances porose 6 and be covered in the fuel reserve tank 1, the upper end of tongue tube sensor 3 and capacitive transducer 4 is fixedly arranged on the end cap 2, insert respectively in the fuel reserve tank 1 lower end, reflect volume read-out and oil product label in order to detect respectively liquid level and voltage, and the output terminal of tongue tube sensor 3 and capacitive transducer 4 is connected to display 5 by wire 7, in order to the display measurement result.Described tongue tube sensor 3 comprises by many single tongue tubes and is connected in series the pipe shaft that consists of and is sheathed on float 8 on the pipe shaft, float 8 is with fuel reserve tank 1 interior liquid surface lifting, and triggers corresponding liquid level.Compare with general pressure transducer, select tongue tube sensor 3 to have fabulous degree of accuracy, not affected by environment, even the temperature of gasoline can constantly raise with vehicle operating in the car, can not affect its measuring accuracy yet.Described end cap 2 tops also are provided with terminal box 9, and the upper end of described tongue tube sensor 3 and capacitive transducer 4 and wire 7 coupling parts are sealed in the terminal box 9.So, can avoid tongue tube sensor 3 and capacitive transducer 4 all to be immersed in the oil, cause potential safety hazard thereby introduce charged element.
The circuit design of pick-up unit of the present invention is divided into three parts: motherboard circuit, tongue tube sensor control circuit and capacitive transducer 4 control circuits.Motherboard circuit comprises again power circuit, measures the liquid level circuit and detects gasoline label circuit three parts.
See also shown in Figure 2, take the 7 end to end formation tongue tube of tongue tube sensors as example, comprise resistance R 1-R6, the R10 that 7 head and the tail are in series by its liquid level detection circuit that consists of, between resistance all and be connected to a normal open switch S1-S7, the S1-S7 other end all is connected to smoothing circuit, and this smoothing circuit comprises smoothing resistor R7 and level and smooth capacitor C 1, and smoothing resistor R7 one end links to each other with the output terminal of normal open switch S1-S7, the other end links to each other with smoothing capacity C1, smoothing capacity C1 other end ground connection.When float raises along with oil level and rises, closed difference is divided the switch S 1-S7 of piezoelectricity successively, and the signal output of different minutes piezoelectricity, and make the voltage rising by smoothing circuit, thus directly change another numerical value into by a numerical value in the time of can avoiding the display registration.
Please in conjunction with shown in Figure 3, smoothing circuit inputs to respectively voltage buffer and voltage analog device with the signal of different dividing points.The voltage analog device comprises that amplifier LVM358 and capacitor C 2 consist of, and is in order to strengthen the driving force of signal; Voltage comparator also comprises amplifier LVM358, that voltage and the reference voltage that will export compares, when the oil mass that adds surpasses setting range, when namely exceeding the maximum magnitude that tongue tube can detect, the voltage of output this moment is greater than reference voltage, voltage comparator is derived high level signal, triggers simultaneously and measures the liquid level circuit.
Please in conjunction with shown in Figure 4, when smoothing circuit inputs to the voltage analog device with the signal of different dividing points, the voltage analog device strengthens after the driving force of signal the measurement liquid level circuit that signal is inputed in the motherboard circuit, consists of a monostable circuit.This measurement liquid level circuit comprises the monostable circuit chip of 74CH123 type, can access a regular time parameter 4s by resistance R 10, capacitor C 4, and monostable circuit is triggered when oil level surpasses peak, and hummer continues the 4s that pipes, and stops behind the 4s piping.If still pour gasoline into this moment in device, monostable circuit is triggered again, and hummer continues the 4s that pipes
See also shown in Figure 5ly, the control circuit of capacitive transducer has used the 74HC4046 cake core, and it mainly is made of voltage controlled oscillator (VCO) and frequency comparator.C7 is local oscillator electric capacity, and setting value is 100 pico farads; If electric capacity between pole plate is designated as the C pole plate, C=C7+C pole plate then, wherein C7 and R1, R2 consist of RC concussion, i.e. voltage controlled oscillator.By voltage controlled oscillator output frequency be denoted as fRC.Wherein fRC is directly proportional with input voltage.Active crystal oscillator is linked to each other with 14 interfaces of chip, and wherein active crystal oscillator setting value is 100MHz, is denoted as f0.Frequency comparator compares fRC and f0 and export, and output valve equals │ fRC-f0 │, is denoted as V0.When not adding any medium between two-plate, this moment, output voltage was 1V, and this is worth the namely specific inductive capacity of air, is denoted as the V air.If add gasoline in container, fRC reduces, thereby f0＞fRC. is so that │ fRC-f0 │ value becomes large at this moment, and namely the V0 value becomes large.Because fRC is directly proportional with input voltage, so along with the V0 value becomes large, fRC also becomes large and again inputs to frequency comparator and active crystal oscillator compares.This step circuit circulation running, until fRC equals active crystal oscillator 1MHz, this wherein the variable quantity of voltage be designated as Δ V, so V oil=1V+ Δ V. Δ V difference when adding the gasoline of different labels, so circuit can be told the gasoline of different labels.
Please in conjunction with shown in Figure 6, by testing to such an extent that the mean value of V93# oil is 2.5V, the mean value of V97# oil is 2.8V.Because empirical value is comparatively approaching, therefore in last minute circuit, increased a differential amplifier, and to set VW1 be 2V, the wherein gain of differential amplifier
Computing formula is: the * G of V output=(V0-VW1).Calculate according to this formula, the * 4.7=2.42V of V 93# gasoline output=(2.5V-2V), the * 4.7=3.76V of V 97# gasoline output=(2.8V-2V), difference is obvious.Obtained rule through many experiments, and finished thus the later stage circuit of capacitive transducer: what output voltage values surpassed 3.5V is 97# gasoline, is 93# gasoline between 2V and 3.5V.
See also shown in Figure 7ly, the power circuit of motherboard circuit mainly comprises power supply BT1, interrupteur SW 1 and a mu balanced circuit that is made of 78X X series voltage stabilizing chip, when input voltage during more than or equal to 9V, sets output voltage and equals all the time 5V.
See also shown in Figure 8, capacitive transducer 4 can be differentiated 93# gasoline and 97# gasoline, but this only is an analog quantity, how to make this analog quantity change digital quantity into? in detecting the gasoline label circuit, mainly use two voltage comparators and a gated buffer.Capacitive transducer 4 inputs to respectively the high low-voltage place of motherboard circuit with the gained signal, and the voltage comparator at two places compares input signal and reference signal, and wherein the reference signal at low-voltage place is 2V, and the reference signal at high voltage place is 4V.If input signal is greater than reference signal, then voltage comparator is exported high level signal, the circuit voltage 5V that namely sets; If less than reference signal, then the voltage comparator output signal is 0. by this principle, if when adding 93# gasoline in the circuit (input voltage is 2.42V), the voltage comparator at the low place of pressing is output as 5V, the voltage comparator at the height place of pressing is output as 0, so LED display shows 93# gasoline; If but what add is 97# gasoline, then can show simultaneously 93# gasoline and 97# gasoline on the display screen, this is obviously unreasonable, so has added again gated buffer in circuit.Gated buffer compares the magnitude of voltage of the height place of pressing input, and the side that registration is larger output.Signal driver triode after the output is so that LED display shows correct gasoline label.At first take 93# gasoline as example, when 2.42V voltage inputs to respectively the voltage comparator at high low-voltage place, high voltage comparer output 0V opens the gate-control signal of gated buffer, so that low spot presses the output signal of comparer by 74HC125 type gated buffer, output rear drive triode T1 makes LED display show 93# gasoline; Because the high voltage comparer is output as 0, can not drive triode, so display screen can't show 97# gasoline.Again take 97# gasoline as example, when inputting 3.76V respectively to high low-voltage comparator, high low-voltage comparator is exported high level signal simultaneously, and this moment, the height place of pressing closed gate-control signal, so that the low place of pressing can't drive triode, and the height place of pressing driving triode makes display screen show 97# gasoline
In sum, in today that oil price rapidly goes up, adopt pick-up unit of the present invention can make the car owner that gasoline is had clear and definite right to know, at utmost avoid some illegal refuelling stations to embezzle part of what should be issued gasoline for obtaining more interests, even the generation of this event of water mixing in oil.Arrive above-mentioned purpose by tongue tube sensor 3 and capacitive transducer 4, measure fast accurate, have very high using value.In addition, cheap, the stable performance of this installation cost, and has a higher security, can be installed in the place of any loading gasoline, by the current real-time oil quantity of being converted to of electronic sensing device and add the label of gasoline, and measurement result shows with numeral on LCDs, can make the car owner that oil product, the oil mass of gasoline that vehicle adds are had intuitively understanding.
But, those of ordinary skill in the art will be appreciated that, above embodiment illustrates the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of the above embodiment.
Claims (2)
1. survey liquid level tongue tube sensor control circuit for one kind, it is characterized in that:
Comprise between the tongue tube resistance, resistance of a plurality of mutual series connection all and be connected to a normal open switch, the other end of each normal open switch is connected to a smoothing circuit, the smoothing circuit output terminal is connected to respectively voltage buffer and voltage analog device, raise along with oil level and rise when being sheathed on float on the tongue tube sensor, closed normal open switch successively, export different minute piezoelectric signals to smoothing circuit, again the signal of different dividing points is inputed to respectively voltage buffer and voltage analog device by smoothing circuit.
2. survey liquid level tongue tube sensor control circuit according to claim 1, it is characterized in that: described smoothing circuit comprises smoothing resistor and smoothing capacity, smoothing resistor one end links to each other with the output terminal of normal open switch, and the other end links to each other with smoothing capacity, smoothing capacity other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101867170A CN102980634A (en) | 2012-06-07 | 2012-06-07 | Reed switch transducer control circuit for liquid-level measurement purpose |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101867170A CN102980634A (en) | 2012-06-07 | 2012-06-07 | Reed switch transducer control circuit for liquid-level measurement purpose |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102980634A true CN102980634A (en) | 2013-03-20 |
Family
ID=47854862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101867170A Pending CN102980634A (en) | 2012-06-07 | 2012-06-07 | Reed switch transducer control circuit for liquid-level measurement purpose |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102980634A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108204847A (en) * | 2017-12-27 | 2018-06-26 | 中国航发四川燃气涡轮研究院 | A kind of aircraft engine oil liquid level and oil product one measurement sensor and method |
| CN110887544A (en) * | 2019-11-28 | 2020-03-17 | 四川泛华航空仪表电器有限公司 | Combined type fuel sensor |
| CN111879375A (en) * | 2020-07-16 | 2020-11-03 | 三峡大学 | Water level monitoring device and method based on electric conductivity |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5478966A (en) * | 1994-03-08 | 1995-12-26 | Tokyo Keiso Kabushiki-Kaisha | Hinged long-reach magnetic detector for liquid level measurements |
| CN101526386A (en) * | 2009-04-03 | 2009-09-09 | 哈尔滨威帝汽车电子有限公司 | High precision tongue tube fuel sensor |
| CN102173055A (en) * | 2011-01-30 | 2011-09-07 | 河南工业职业技术学院 | Liquid level detection and oil liquid automatic compensation device |
| CN102445252A (en) * | 2011-12-10 | 2012-05-09 | 河南科技大学 | Resistor type water-level digital sensor |
-
2012
- 2012-06-07 CN CN2012101867170A patent/CN102980634A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5478966A (en) * | 1994-03-08 | 1995-12-26 | Tokyo Keiso Kabushiki-Kaisha | Hinged long-reach magnetic detector for liquid level measurements |
| CN101526386A (en) * | 2009-04-03 | 2009-09-09 | 哈尔滨威帝汽车电子有限公司 | High precision tongue tube fuel sensor |
| CN102173055A (en) * | 2011-01-30 | 2011-09-07 | 河南工业职业技术学院 | Liquid level detection and oil liquid automatic compensation device |
| CN102445252A (en) * | 2011-12-10 | 2012-05-09 | 河南科技大学 | Resistor type water-level digital sensor |
Non-Patent Citations (1)
| Title |
|---|
| 徐柳娟 等: ""智能水箱水位控制系统设计"", 《浙江水利水电专科学校学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108204847A (en) * | 2017-12-27 | 2018-06-26 | 中国航发四川燃气涡轮研究院 | A kind of aircraft engine oil liquid level and oil product one measurement sensor and method |
| CN110887544A (en) * | 2019-11-28 | 2020-03-17 | 四川泛华航空仪表电器有限公司 | Combined type fuel sensor |
| CN111879375A (en) * | 2020-07-16 | 2020-11-03 | 三峡大学 | Water level monitoring device and method based on electric conductivity |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101738240B (en) | Capacitance sensing type fuel meter | |
| CN104266712A (en) | Liquid height measurement method and device based on capacitive sensor | |
| CN102778268B (en) | Integrated measurement system for indirectly measuring oil consumption of vehicular fuel oil | |
| CN102288259A (en) | Segmentation capacitance type liquid level sensor and liquid level measurement method thereof | |
| CN102997977A (en) | Vehicle charged oil capacity and oil product grade detection device | |
| CN201672957U (en) | Automobile fuel meter digitalized device | |
| CN102980634A (en) | Reed switch transducer control circuit for liquid-level measurement purpose | |
| CN101566491A (en) | Method and system for measuring liquid level of conductive liquid | |
| CN108362355A (en) | A kind of level measuring method, device and electronic equipment based on merogenesis capacitance | |
| CN206475739U (en) | Bleeder plug, oil mass detection device and vehicle | |
| CN201438127U (en) | Precise liquid level sensor | |
| CN205102889U (en) | Automatic calibrating installation of fuel tanker aircraft | |
| CN202648759U (en) | Liquid level measuring circuit for refueling vehicle | |
| CN202750071U (en) | Capacitance sensor control circuit used for vehicle refueling | |
| CN201382799Y (en) | Capacity transduction type fuel oil metering instrument | |
| CN202735293U (en) | Power circuit for vehicle refueling detection | |
| CN202649159U (en) | Octane rating measuring circuit | |
| CN103323075A (en) | Fuel level sensor | |
| CN103344300A (en) | Detection device of oil-water interface position and detection method thereof | |
| CN203587151U (en) | Ultrasonic open-channel meter | |
| CN204963949U (en) | Digital fuel quantity sensor of intelligence | |
| CN103575365A (en) | Liquidometer and vehicle-mounted LNG gas bottle | |
| CN208780291U (en) | Engineering truck fuel tank fuel quantity detection device | |
| CN202066552U (en) | Liquid level display device | |
| CN206095352U (en) | Differential pressure liquid level changer of measurable quantity layering density |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130320 |