CN204881767U - Measure device and car of fuel liquid level - Google Patents
Measure device and car of fuel liquid level Download PDFInfo
- Publication number
- CN204881767U CN204881767U CN201520503376.4U CN201520503376U CN204881767U CN 204881767 U CN204881767 U CN 204881767U CN 201520503376 U CN201520503376 U CN 201520503376U CN 204881767 U CN204881767 U CN 204881767U
- Authority
- CN
- China
- Prior art keywords
- liquid level
- fuel liquid
- constant current
- current source
- level sensor
- 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.)
- Active
Links
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Level Indicators Using A Float (AREA)
Abstract
The utility model provides a measure device and car of fuel liquid level, the device includes: power, constant current source, fuel level sensor, a voltage sample module, AD converter and microprocessor, the constant current source is connected, the constant current source for level sensor provides constant current source for the fuel, a voltage sample module for gather the voltage signal on the fuel level sensor, and send the converter for AD with a voltage signal, the AD converter for send for microprocessor after carrying out analog -to -digital conversion with a voltage signal, microprocessor for according to a voltage signal and power of invariablenes current acquisition fuel level sensor's resistance, by fuel level sensor's resistance acquisition fuel liquid level. Can utilize the sampling scope of AD converter completely to the precision of can guaranteeing to sample is more accurate. And the device, need not consider the proportion problem between pull -up resistance and fuel level sensor's the resistance not including pull -up resistance.
Description
Technical field
The utility model relates to parameter measuring technical field, particularly a kind of device and automobile measuring fuel liquid level.
Background technology
Current fuel liquid level sensor is in fact a kind of variohm, and different resistance values represents different liquid levels, and therefore, the mode measuring fuel liquid level obtains resistance value exactly.
See Fig. 1, this figure is the schematic diagram measuring fuel liquid level sensor in prior art.
The variable resistor of fuel liquid level sensor represents with R2, the first end ground connection of R2, second end of R2 connects power supply VCC by pull-up resistor R1, detect the voltage U of R2 second end, because U is the dividing potential drop of the rear R2 of R1 and R2 series connection, therefore, U=VCC*R2/ (R1+R2), obtaining R2=R1*U/ (VCC-U), after obtaining the resistance of R2, obtaining corresponding fuel liquid level value by tabling look-up.
But, the resistance of fuel liquid level sensor variable resistor R2 is generally smaller, fluctuation range is at 10 ~ 200 ohm, and the upper current requirements passed through of R2 is no more than 50mA, so make the resistance of pull-up resistor R1 should be not less than 100 ohm but too greatly, otherwise can not can affect the scope of sampled voltage U.
Be 100 ohm in order to discuss convenient for R2, when pull-up resistor R1 is 100 ohm, electric current can not more than 50mA, and its sample range is 0.5 ~ 3.3V, can not utilize the four corner of the AD sampling module 0 ~ 5V of microprocessor completely.Therefore, the precision of this fuel liquid level sensor metering circuit sampling of the prior art is lower, and along with the increase of pull-up resistor, the scope of sampling can become less, and therefore, that easily causes fuel liquid level to measure is inaccurate.
Therefore, those skilled in the art need to provide a kind of device measuring fuel liquid level, can the liquid level of Measurement accuracy fuel oil.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of device and the automobile of measuring fuel liquid level, can the liquid level of Measurement accuracy fuel oil.
The utility model provides a kind of device measuring fuel liquid level, comprising: power supply, constant current source, fuel liquid level sensor, the first voltage sample module, AD converter and microprocessor;
Described constant current source connects described power supply;
Described constant current source, for providing steady current for described fuel liquid level sensor;
Described first voltage sample module, for gathering the first voltage signal on described fuel liquid level sensor, and sends to described AD converter by described first voltage signal;
Described AD converter, sends to described microprocessor after described first voltage signal is carried out analog to digital conversion;
Described microprocessor, for obtaining the resistance of described fuel liquid level sensor according to described first voltage signal and described continuous current, obtains fuel liquid level by the resistance of described fuel liquid level sensor.
Preferably, also comprise: switching tube;
The first end of described switching tube connects described power supply, and the second end of described switching tube connects described constant current source;
The control end of described switching tube connects described microprocessor;
Described microprocessor, also for conducting and the disconnection of gauge tap pipe, to control described power supply respectively and described constant current source switches on and off.
Preferably, also comprise: protection module;
Described protection module is connected between described constant current source and described fuel liquid level sensor;
Described protection module, for the protection of constant current source.
Preferably, described protection module is diode;
The anode of described diode connects described constant current source, and the negative electrode of described diode connects described fuel liquid level sensor.
Preferably, also comprise: the second voltage sample module;
Described second voltage sample module, for detecting second voltage signal at described constant current source two ends, sends to described AD converter by described second voltage signal;
Described AD converter, sends to described microprocessor after described second voltage signal is carried out analog to digital conversion;
By described second voltage signal, described microprocessor, for judging whether constant current source normally works.
Preferably, described second voltage sample module is sampling resistor.
Preferably, described constant current source comprises: three-terminal voltage regulator, the first resistance and the second resistance;
Described three-terminal voltage regulator comprises first end, the second end and the 3rd end, and described first end is power input, and described second end is current input terminal, and described 3rd end is by described second resistance eutral grounding;
Described first resistance is connected between described second end and the 3rd end.
The utility model also provides a kind of automobile, comprises the device of described measurement fuel liquid level, also comprises: fuel tank.
Compared with prior art, the utility model has the following advantages:
The device that the present embodiment provides, the electric current of suitable constant current source can be set according to the resistance of fuel liquid level sensor, such as, when the span of the resistance of fuel liquid level sensor is between 10 ohm ~ 200 ohm, now the electric current of constant current source can be configured to 25mA, the scope of the first voltage signal on the fuel liquid level sensor of such sampling is 0.25V ~ 5V, be understandable that, this voltage range is the sample range of AD converter, the sample range of AD converter can be utilized so completely, thus can ensure that sampling precision is more accurate.And this device does not comprise pull-up resistor, do not need to consider the ratio problems between pull-up resistor and the resistance of fuel liquid level sensor.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram measuring fuel liquid level sensor in prior art;
Fig. 2 is device embodiment one schematic diagram of the measurement fuel liquid level that the utility model provides;
Fig. 3 is device embodiment two schematic diagram of the measurement fuel liquid level that the utility model provides;
Fig. 4 is the another embodiment schematic diagram of device of the measurement fuel liquid level that the utility model provides;
Fig. 5 is the constant current source structural drawing that the utility model provides.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
For enabling above-mentioned purpose of the present utility model, feature and advantage become apparent more, are described in detail embodiment of the present utility model below in conjunction with accompanying drawing.
Embodiment one:
See Fig. 2, this figure is device embodiment one schematic diagram of the measurement fuel liquid level that the utility model provides.
The device of the measurement fuel liquid level that the present embodiment provides, comprising: power supply 201, constant current source 202, fuel liquid level sensor 203, first voltage sample module 204, AD converter 205 and microprocessor 206;
Described constant current source 202 connects described power supply 201;
Be understandable that, described power supply 201 provides power supply for constant current source 202.
It should be noted that, on automobile, the voltage range that this power supply 201 provides is generally 9V ~ 32V.
Described constant current source 202, for providing steady current for described fuel liquid level sensor 203;
It should be noted that, constant current source 202 can export constant electric current, thus provides constant electric current, when fuel liquid level changes for fuel liquid level sensor 203, the resistance that fuel liquid level sensor 203 embodies will change, and the voltage measured on fuel liquid level sensor 203 will change like this.
Described first voltage sample module 204, for gathering the first voltage signal on described fuel liquid level sensor 203, and sends to described AD converter 205 by described first voltage signal;
Described AD converter 205, sends to described microprocessor 206 after described first voltage signal is carried out analog to digital conversion;
Described microprocessor 206, for obtaining the resistance of described fuel liquid level sensor 203 according to described first voltage signal and described continuous current, obtains fuel liquid level by the resistance of described fuel liquid level sensor 203.
Due to voltage U=resistance R* electric current I.When I is constant, R can be calculated by U.Utilize the relation of R and liquid level can know current fuel liquid level.
The device that the present embodiment provides, the electric current of suitable constant current source can be set according to the resistance of fuel liquid level sensor, such as, when the span of the resistance of fuel liquid level sensor is between 10 ohm ~ 200 ohm, now the electric current of constant current source can be configured to 25mA, the scope of the first voltage signal on the fuel liquid level sensor 203 of such sampling is 0.25V ~ 5V, be understandable that, this voltage range is the sample range of AD converter 205, the sample range of AD converter 205 can be utilized so completely, thus can ensure that sampling precision is more accurate.And this device does not comprise pull-up resistor, do not need to consider the ratio problems between pull-up resistor and the resistance of fuel liquid level sensor.
Embodiment two:
See Fig. 3, this figure is device embodiment two schematic diagram of the measurement fuel liquid level that the utility model provides.
The device of the measurement fuel liquid level that the present embodiment provides, also comprises: switching tube 301;
The first end of described switching tube 301 connects described power supply, and the second end of described switching tube 301 connects described constant current source;
The control end of described switching tube 301 connects described microprocessor 206;
Described microprocessor 206, also for conducting and the disconnection of gauge tap pipe 301, switches on and off with described constant current source 202 to control described power supply 201 respectively.
When needing to measure the fuel liquid level height in fuel tank, the conducting of microprocessor 206 gauge tap pipe 301, thus make the energy of power supply 201 arrive constant current source 202, constant current source 202 according to pre-configured parameter for fuel liquid level sensor 203 provides constant current value, first voltage sample module 204 gathers the magnitude of voltage of fuel liquid level sensor 203 to microprocessor 206 simultaneously, the galvanometer that microprocessor 206 is provided by first voltage signal of sampling and constant current source calculates the resistance value of corresponding fuel liquid level sensor 203, and the height of fuel oil in fuel tank liquid level is obtained by resistance value, when after the collection completing fuel oil in fuel tank liquid level, microprocessor 206 gauge tap pipe 301 is closed, and is cut off by the energy of power supply 201.
In addition, the device of the measurement fuel liquid level that the present embodiment provides, also comprises: protection module 302;
Described protection module 302 is connected between described constant current source 202 and described fuel liquid level sensor 203;
Described protection module 302, for the protection of constant current source 202.
In Automotive Electronics Standards ISO16750; when automobile carries out the test being shorted to 32V; when the output terminal of fuel liquid level sensor 203 is shorted to power supply 201, arrive the electric current of fuel liquid level sensor 203 by protection module 302 constant current source 202 that can ensure to decay.
Being understandable that, is that the first voltage signal that the first voltage sample module 204 is sampled can reflect and now carries out short circuit test, and microprocessor 206 can notify user, such as, carry out warning light display or audible alarm when automobile carries out short circuit test.
Particularly, as shown in Figure 4, described protection module can be diode;
The anode of described diode connects described constant current source 202, and the negative electrode of described diode connects described fuel liquid level sensor 203.
The device of the measurement fuel liquid level that the present embodiment provides, also comprises: the second voltage sample module 303;
Described second voltage sample module 303, for detecting second voltage signal at described constant current source 202 two ends, sends to described AD converter 205 by described second voltage signal;
Described AD converter 205, sends to described microprocessor after described second voltage signal is carried out analog to digital conversion;
By described second voltage signal, described microprocessor 206, for judging whether constant current source 202 normally works.
Be understandable that, described second voltage sample module 303 is sampling resistor.
Whether the second voltage sample module 303 runs well for the work of monitoring constant current source 202.When judging to occur abnormal, take correction measure in time.
Introduce the constant current source adopted in the utility model below, see Fig. 5, this figure is the structural drawing of the constant current source that the utility model provides.
The constant current source that the present embodiment provides comprises: three-terminal voltage regulator 501, first resistance R1 and the second resistance R2;
Described three-terminal voltage regulator comprises first end A, the second end B and the 3rd end C, and described first end A is power input, and described second end B is current input terminal, and described 3rd end C is by described second resistance R2 ground connection;
Described first resistance R1 is connected between described second end B and the 3rd end C.
The principle of this three-terminal voltage regulator 501 is the adjustments by regulating the scale between R1 and R2 to complete output voltage, voltage because of R1 two ends remains a definite value U, and it is very faint from C electric current out, so the electric current flowing through R1 is consistent with the electric current flowing through R2, electric current I=U/R1 needed for such constant current part, only needs the resistance of regulating resistance R1 just can complete the size of constant current portion of electrical current value.
Based on the device of the measurement fuel liquid level that above embodiment provides, the utility model also provides a kind of automobile, comprises the device of the measurement fuel liquid level described in above embodiment, also comprises: fuel tank.
Wherein, the device of this measurement fuel liquid level can measure the liquid level of fuel oil exactly.
The above is only preferred embodiment of the present utility model, not does any pro forma restriction to the utility model.Although the utility model discloses as above with preferred embodiment, but and be not used to limit the utility model.Any those of ordinary skill in the art, do not departing under technical solutions of the utility model ambit, the Method and Technology content of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solutions of the utility model, or be revised as the Equivalent embodiments of equivalent variations.Therefore, every content not departing from technical solutions of the utility model, according to technical spirit of the present utility model to any simple modification made for any of the above embodiments, equivalent variations and modification, all still belongs in the scope of technical solutions of the utility model protection.
Claims (8)
1. measure a device for fuel liquid level, it is characterized in that, comprising: power supply, constant current source, fuel liquid level sensor, the first voltage sample module, AD converter and microprocessor;
Described constant current source connects described power supply;
Described constant current source, for providing steady current for described fuel liquid level sensor;
Described first voltage sample module, for gathering the first voltage signal on described fuel liquid level sensor, and sends to described AD converter by described first voltage signal;
Described AD converter, sends to described microprocessor after described first voltage signal is carried out analog to digital conversion;
Described microprocessor, for obtaining the resistance of described fuel liquid level sensor according to described first voltage signal and described continuous current, obtains fuel liquid level by the resistance of described fuel liquid level sensor.
2. the device of measurement fuel liquid level according to claim 1, is characterized in that, also comprise: switching tube;
The first end of described switching tube connects described power supply, and the second end of described switching tube connects described constant current source;
The control end of described switching tube connects described microprocessor;
Described microprocessor, also for conducting and the disconnection of gauge tap pipe, to control described power supply respectively and described constant current source switches on and off.
3. the device of measurement fuel liquid level according to claim 1, is characterized in that, also comprise: protection module;
Described protection module is connected between described constant current source and described fuel liquid level sensor;
Described protection module, for the protection of constant current source.
4. the device of measurement fuel liquid level according to claim 3, is characterized in that, described protection module is diode;
The anode of described diode connects described constant current source, and the negative electrode of described diode connects described fuel liquid level sensor.
5. the device of measurement fuel liquid level according to claim 1, is characterized in that, also comprise: the second voltage sample module;
Described second voltage sample module, for detecting second voltage signal at described constant current source two ends, sends to described AD converter by described second voltage signal;
Described AD converter, sends to described microprocessor after described second voltage signal is carried out analog to digital conversion;
By described second voltage signal, described microprocessor, for judging whether constant current source normally works.
6. the device of measurement fuel liquid level according to claim 5, is characterized in that, described second voltage sample module is sampling resistor.
7. the device of measurement fuel liquid level according to claim 1, is characterized in that, described constant current source comprises: three-terminal voltage regulator, the first resistance and the second resistance;
Described three-terminal voltage regulator comprises first end, the second end and the 3rd end, and described first end is power input, and described second end is current input terminal, and described 3rd end is by described second resistance eutral grounding;
Described first resistance is connected between described second end and the 3rd end.
8. an automobile, is characterized in that, comprises the device of the measurement fuel liquid level described in any one of claim 1-7, also comprises: fuel tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520503376.4U CN204881767U (en) | 2015-07-13 | 2015-07-13 | Measure device and car of fuel liquid level |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520503376.4U CN204881767U (en) | 2015-07-13 | 2015-07-13 | Measure device and car of fuel liquid level |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204881767U true CN204881767U (en) | 2015-12-16 |
Family
ID=54826129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520503376.4U Active CN204881767U (en) | 2015-07-13 | 2015-07-13 | Measure device and car of fuel liquid level |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204881767U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106919117A (en) * | 2017-04-25 | 2017-07-04 | 航天科技控股集团股份有限公司 | For automobile instrument water temperature fuel sensor sample circuit |
| CN107560686A (en) * | 2017-08-07 | 2018-01-09 | 浙江海洋大学 | A kind of crude oil liquid level emasuring device |
| CN109540254A (en) * | 2018-10-10 | 2019-03-29 | 惠州市德赛西威汽车电子股份有限公司 | A kind of fuel oil for vehicles overmeasure computation method based on voltage ratio |
-
2015
- 2015-07-13 CN CN201520503376.4U patent/CN204881767U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106919117A (en) * | 2017-04-25 | 2017-07-04 | 航天科技控股集团股份有限公司 | For automobile instrument water temperature fuel sensor sample circuit |
| CN107560686A (en) * | 2017-08-07 | 2018-01-09 | 浙江海洋大学 | A kind of crude oil liquid level emasuring device |
| CN109540254A (en) * | 2018-10-10 | 2019-03-29 | 惠州市德赛西威汽车电子股份有限公司 | A kind of fuel oil for vehicles overmeasure computation method based on voltage ratio |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204881767U (en) | Measure device and car of fuel liquid level | |
| CN105628266A (en) | Temperature compensation system and method of pressure sensor | |
| CN111722044A (en) | Direct current charging pile testing method, device and equipment based on frequency sweep calibration shunt | |
| CN104181434A (en) | Direct current power supply insulation detection device and detection method | |
| CN104458045A (en) | Temperature measuring system | |
| CN108226646B (en) | Sensitive resistance measuring device and measuring method | |
| CN204964077U (en) | Pressure drag formula pressure sensor pressure detection circuit | |
| CN205720565U (en) | A kind of batch testing plate for testing signal condition chip | |
| CN203688108U (en) | Transformer temperature measurement system calibration meter | |
| CN102768078B (en) | Automatic resistance compensation method for temperature-measuring conductors for two-wire thermal resistor | |
| CN203705602U (en) | Automatic detection and calibration device for bridge board of electric vehicle | |
| CN204989442U (en) | Contact resistance tester calibrating device | |
| CN205384360U (en) | BMS current parameter calibrating device | |
| CN204007788U (en) | Resistance-type level transducer | |
| CN108572273B (en) | Low current measuring circuit and measuring method thereof | |
| CN203084120U (en) | Static parameter tester for voltage limiting type surge protector | |
| CN203519712U (en) | Battery voltage acquisition system | |
| CN203657964U (en) | Pressure transmitter | |
| CN203396501U (en) | Pointer type electronic thermometer | |
| CN109061525A (en) | L ED driving power supply performance test system | |
| CN204730800U (en) | A kind of sensor for large scale structure displacement measurement and device | |
| CN203786111U (en) | Calibrating device for optical interference type methane measuring equipment | |
| CN204495909U (en) | Wide-range high-accuracy electrical resistance collection circuit | |
| CN206339258U (en) | Laboratory safety-protection system based on Zigbee | |
| CN205027778U (en) | Anemometer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |