CN202393454U - Acquisition circuit of oil level sensor - Google Patents
Acquisition circuit of oil level sensor Download PDFInfo
- Publication number
- CN202393454U CN202393454U CN2011205486516U CN201120548651U CN202393454U CN 202393454 U CN202393454 U CN 202393454U CN 2011205486516 U CN2011205486516 U CN 2011205486516U CN 201120548651 U CN201120548651 U CN 201120548651U CN 202393454 U CN202393454 U CN 202393454U
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- CN
- China
- Prior art keywords
- resistance
- fuel
- transport
- quantity transducer
- placing device
- 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.)
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Abstract
The utility model provides an acquisition circuit of an oil level sensor. The acquisition circuit comprises the oil level sensor (1) and a resistor (10), wherein one end of the oil level sensor (1) is in ground connection, and the other end of the oil level sensor (1) is connected with one end of the resistor (10) in series; the other end of the resistor (10) is connected with a constant voltage power supply (VCC); and the relationship among the resistance value R10 of the resistor (10), the minimum resistance value Rmin and the maximum resistance value Rmax of the oil level sensor (1) and the voltage value V6 of the VCC meets the formula: Rmin*V6/ (Rmin+R10) is more than or equal to 0.1V, and Rmax*V6/ (Rmax+R10) is less than or equal to 5V. The acquisition circuit of the oil level sensor provided by the utility model ensures the oil quantity data acquired on the oil level sensor (1) to be higher in accuracy and more accurate.
Description
Technical field
The utility model relates to heavy vehicle, relates in particular to a kind of fuel-quantity transducer Acquisition Circuit that is used for heavy vehicle.
Background technology
The existing fuel-quantity transducer that is used for heavy vehicle is resistance sensor; Its Acquisition Circuit adopts the constant current source Acquisition Circuit more; Be fuel-quantity transducer a steady current is provided; Owing to the resistance value of fuel-quantity transducer along with the oil mass of gathering changes, cause voltage also to change, therefore the magnitude of voltage through collection fuel-quantity transducer two ends can obtain the oil mass data.
Yet in the prior art, the earth terminal of fuel-quantity transducer is directly to overlap in the earth loop of car load; Because the common mode interference that the earth point of heavy vehicle has loop current to cause; Usually can produce a loop voltage about 0.01V in the earth loop, and because the electric current of constant current source is all very faint, and the resistance value of fuel-quantity transducer is also very little; The oil mass sensing data that causes collecting receives the serious interference of loop voltage, when low oil mass, causes sensing data inaccurate fully especially.
The utility model content
The purpose of the utility model is the inaccurate problem of oil mass data that collects to existing fuel-quantity transducer Acquisition Circuit, provides a kind of acquisition precision high fuel-quantity transducer Acquisition Circuit.
To achieve these goals; The utility model provides a kind of fuel-quantity transducer Acquisition Circuit; This Acquisition Circuit comprises fuel-quantity transducer and resistance, and an end of said fuel-quantity transducer is used for ground connection, and the other end of said fuel-quantity transducer is used for being connected in series with an end of said resistance; The other end of said resistance is used for being connected with constant voltage source, the minimum resistance R of the resistance value R10 of said resistance, said fuel-quantity transducer
MinWith maximum resistance R
Max, and the relation of the magnitude of voltage V6 of said constant voltage source satisfy following formula: R
Min* V6/ (R
Min+ R10)>=and 0.1V, R
Max* V6/ (R
Max+ R10)≤5V.
Preferably, the minimum resistance R of the resistance value R10 of said resistance, said fuel-quantity transducer
MinWith maximum resistance R
Max, and the relation of the magnitude of voltage V6 of said constant voltage source satisfy following formula: R
Min* V6/ (R
Min+ R10)>=and 0.24V, R
Max* V6/ (R
Max+ R10)≤2.5V.
Preferably, said Acquisition Circuit also comprises photoelectric isolating circuit, and the link of said resistance and said fuel-quantity transducer is connected with the input end of this photoelectric isolating circuit.
Preferably, said photoelectric isolating circuit comprises first transport and placing device, linear optical coupling and second transport and placing device, and said first transport and placing device, linear optical coupling and second transport and placing device connect in order.
Preferably; Said photoelectric isolating circuit also comprises first resistance, second resistance and the 3rd resistance; The link of said resistance and said fuel-quantity transducer is connected with the input negative terminal of said first transport and placing device through first resistance; The input anode of said first transport and placing device is used for ground connection; The input anode of said second transport and placing device is used for ground connection; Said linear optical coupling has the first transmitting terminal pin, the second transmitting terminal pin, the first feedback end pin, the second feedback end pin, the first receiving end pin and the second receiving end pin, and the first transmitting terminal pin of said linear optical coupling is used for ground connection, the first receiving end pin through the 3rd resistance is connected with the output terminal of said first transport and placing device, the second transmitting terminal pin is used to connect said constant voltage source VCC, the first feedback end pin is connected to said first transport and placing device input negative terminal, the second feedback end pin and is used for that ground connection, the second receiving end pin are connected with the input negative terminal of said second transport and placing device, the second receiving end pin also is connected with the output terminal of said second transport and placing device through second resistance.
The technical scheme that provides according to the utility model is carried out dividing potential drop through resistance of series connection on fuel-quantity transducer, and makes the minimum resistance R of the resistance value R10 of this resistance, said fuel-quantity transducer
MinWith maximum resistance R
Max, and the relation of the magnitude of voltage V6 of said constant voltage source satisfy following formula: R
Min* V6/ (R
Min+ R10)>=and 0.1V, R
Max* V6/ (R
Max+ R10)≤2.5V; Can be when the loop voltage of 0.01V be arranged on the fuel-quantity transducer; Make that the maximum error of data is merely 0.01V/0.1V=10% on the fuel-quantity transducer collect, make that thus the oil mass data precision of the collection on the fuel-quantity transducer is higher, the oil mass data are more accurate.
Other feature and advantage of the utility model will partly specify in embodiment subsequently.
Description of drawings
Accompanying drawing is the further understanding that is used to provide the utility model, and constitutes the part of instructions, is used to explain the utility model with following embodiment, but does not constitute the restriction to the utility model.In the accompanying drawings:
Fig. 1 is the structural representation of the fuel-quantity transducer Acquisition Circuit that provides of the utility model;
Fig. 2 is the circuit structure diagram of a kind of preferred implementation of the fuel-quantity transducer Acquisition Circuit that provides of the utility model.
Description of reference numerals
1 fuel-quantity transducer, 9 photoelectric isolating circuits
10 resistance R, 1 first resistance
R2 second resistance R 3 the 3rd resistance
The E1 first transport and placing device E2 second transport and placing device
The U1 linear optical coupling A first transmitting terminal pin
The B second transmitting terminal pin C first feedback end pin
The D second feedback end pin E first receiving end pin
The F second receiving end pin VCC constant voltage source
Embodiment
Be elaborated below in conjunction with the embodiment of accompanying drawing to the utility model.Should be understood that embodiment described herein only is used for explanation and explains the utility model, is not limited to the utility model.
The utility model provides a kind of fuel-quantity transducer Acquisition Circuit; As shown in Figure 1; This Acquisition Circuit comprises fuel-quantity transducer 1 and resistance 10, and an end of said fuel-quantity transducer 1 is used for ground connection, and the other end of said fuel-quantity transducer 1 is used for being connected in series with an end of said resistance 10; The other end of said resistance 10 is used for being connected with constant voltage source VCC, the minimum resistance R of the resistance value R10 of said resistance 10, said fuel-quantity transducer 1
MinWith maximum resistance R
Max, and the relation of the magnitude of voltage V6 of said constant voltage source VCC satisfy following formula: R
Min* V6/ (R
Min+ R10)>=and 0.1V, R
Max* V6/ (R
Max+ R10)≤5V.
Said fuel-quantity transducer 1 is for just changing the oil measurement device of measuring the oil mass size through oil level; Fuel-quantity transducer 1 mainly comprises oil float and swept resistance; Usually through coming sensing oil level height in the fuel tank that oil float is installed in heavy vehicle; Can cause change in resistance by the moving Wound-rotor type swept resistance of oil float subband, the height through oil level in the fuel tank causes that the variation of swept resistance resistance measures oil mass and change.The Standard resistance range R of said fuel-quantity transducer
Min-R
MaxCan select according to the needs of practical operation.
According to the technical scheme of the utility model, in order to measure the oil mass data more accurately, resistance 10 of series connection is as shown in Figure 1 on fuel-quantity transducer 1, and makes the minimum resistance R of the resistance value R10 of this resistance, said fuel-quantity transducer
MinWith maximum resistance R
Max, and the relation of the magnitude of voltage V6 of said constant voltage source VCC satisfy following formula: R
Min* V6/ (R
Min+ R10)>=and 0.1V, R
Max* V6/ (R
Max+ R10)≤5V; Thus, carry out dividing potential drop through adopting series resistor 10, when the common mode interference owing to car load causes on fuel-quantity transducer 1, producing the loop voltage of 0.01V; The maximum error of voltage data is merely 0.01V/0.1V=10% on the fuel-quantity transducer 1 that collects; This error amount reduces greatly, makes that the oil mass data precision of gathering on the fuel-quantity transducer 1 is higher, and the oil mass data are more accurate.
In order to obtain oil mass data more accurately, under the preferable case, can be so that the minimum resistance R of the resistance value R10 of said resistance 10, said fuel-quantity transducer 1
MinWith maximum resistance R
Max, and the relation of the magnitude of voltage V6 of said constant voltage source VCC satisfy following formula: R
Min* V6/ (R
Min+ R10)>=and 0.24V, Rmax * V6/ (Rmax+R10)≤2.5V.
Thus, when fuel-quantity transducer 1 produces the loop voltage of 0.01V, can be so that the maximum error of the voltage data on the fuel-quantity transducer that collects 1 be merely 0.01V/0.24V=4%, the oil mass data that collect thus are more accurate.
Because the common mode interference that the earth point of heavy vehicle has loop current to cause; Make the simulating signal of fuel-quantity transducer 1 output receive serious interference; For fuel-quantity transducer Acquisition Circuit and car load ground wire are isolated, reduce the interference of car load to Acquisition Circuit, as shown in Figure 2; The Acquisition Circuit that the utility model provides also comprises photoelectric isolating circuit 9, and the link of said resistance 10 and said fuel-quantity transducer 1 is connected with the input end of this photoelectric isolating circuit 9.
Technical scheme according to the utility model; Said photoelectric isolating circuit 9 is made up of linear photoconductor isolated component and peripheral discharge circuit; The interface circuit that this photoelectric isolating circuit 9 is isolated as simulating signal; Be used to realize the mutual isolation between signal input, the output, reduce the interference of interference source, as shown in Figure 2; Said photoelectric isolating circuit 9 comprises the first transport and placing device E1, linear optical coupling U1 and the second transport and placing device E2, and the said first transport and placing device E1, linear optical coupling U1 and the second transport and placing device E2 connect in order.Said photoelectric isolating circuit 9 also comprises first resistance R 1, second resistance R 2 and the 3rd resistance R 3; The link of said resistance 10 and said fuel-quantity transducer 1 is connected through the input negative terminal of first resistance R 1 with the said first transport and placing device E1; The input anode of the said first transport and placing device E1 is used for ground connection; The input anode of the said second transport and placing device E2 is used for ground connection; Said linear optical coupling U1 has the first transmitting terminal pin A, the second transmitting terminal pin B, the first feedback end pin C, the second feedback end pin D, the first receiving end pin E and the second receiving end pin F, and the first transmitting terminal pin A of said linear optical coupling U1 is used for ground connection, the first receiving end pin E through the 3rd resistance R 3 is connected with the output terminal of the said first transport and placing device E1, the second transmitting terminal pin B is used to connect said constant voltage source VCC, the first feedback end pin C is connected to the said first transport and placing device E1 input negative terminal, the second feedback end pin D and is used for that ground connection, the second receiving end pin F are connected with the input negative terminal of the said second transport and placing device E2, the second receiving end pin F also is connected with the output terminal of the said second transport and placing device E2 through second resistance R 2.
Can isolate amplification owing to gather through photoelectric isolating circuit 9 from the voltage data of fuel-quantity transducer 1, avoid the common mode interference of the ground wire loop current of car load, make that the analog voltage signal that collects is more stable the fuel-quantity transducer Acquisition Circuit.
More than combine accompanying drawing to describe the preferred implementation of the utility model in detail; But; The utility model is not limited to the detail in the above-mentioned embodiment; In the technical conceive scope of the utility model, can carry out multiple simple variant to the technical scheme of the utility model, these simple variant all belong to the protection domain of the utility model.
Need to prove in addition; Each concrete technical characterictic described in above-mentioned embodiment under reconcilable situation, can make up through any suitable manner; For fear of unnecessary repetition, the utility model is to the explanation no longer separately of various possible array modes.
In addition, also can carry out combination in any between the various embodiment of the utility model, as long as its thought without prejudice to the utility model, it should be regarded as content disclosed in the utility model equally.
Claims (5)
1. fuel-quantity transducer Acquisition Circuit; It is characterized in that; This Acquisition Circuit comprises fuel-quantity transducer (1) and resistance (10), and an end of said fuel-quantity transducer (1) is used for ground connection, and the other end of said fuel-quantity transducer (1) is used for being connected in series with an end of said resistance (10); The other end of said resistance (10) is used for being connected with constant voltage source (VCC), the minimum resistance R of the resistance value R10 of said resistance (10), said fuel-quantity transducer (1)
MinWith maximum resistance R
Max, and the relation of the magnitude of voltage V6 of said constant voltage source (VCC) satisfy following formula:
R
min×V6/(R
min+R10)≥0.1V，R
max×V6/(R
max+R10)≤5V。
2. Acquisition Circuit according to claim 1 is characterized in that, the minimum resistance R of the resistance value R10 of said resistance (10), said fuel-quantity transducer (1)
MinWith maximum resistance R
Max, and the relation of the magnitude of voltage V6 of said constant voltage source (VCC) satisfy following formula:
R
min×V6/(R
min+R10)≥0.24V，R
max×V6/(R
max+R10)≤2.5V。
3. Acquisition Circuit according to claim 1 is characterized in that, said Acquisition Circuit also comprises photoelectric isolating circuit (9), and the link of said resistance (10) and said fuel-quantity transducer (1) is connected with the input end of this photoelectric isolating circuit (9).
4. Acquisition Circuit according to claim 3; It is characterized in that; Said photoelectric isolating circuit (9) comprises first transport and placing device (E1), linear optical coupling (U1) and second transport and placing device (E2), and said first transport and placing device (E1), linear optical coupling (U1) and second transport and placing device (E2) connect in order.
5. Acquisition Circuit according to claim 4; It is characterized in that; Said photoelectric isolating circuit (9) also comprises first resistance (R1), second resistance (R2) and the 3rd resistance (R3); The link of said resistance (10) and said fuel-quantity transducer (1) is connected through the input negative terminal of first resistance (R1) with said first transport and placing device (E1); The input anode of said first transport and placing device (E1) is used for ground connection; The input anode of said second transport and placing device (E2) is used for ground connection; Said linear optical coupling (U1) has the first transmitting terminal pin (A), the second transmitting terminal pin (B), the first feedback end pin (C), the second feedback end pin (D), the first receiving end pin (E) and the second receiving end pin (F), and the first transmitting terminal pin (A) of said linear optical coupling (U1) is used for ground connection, the first receiving end pin (E) through the 3rd resistance (R3) is connected with the output terminal of said first transport and placing device (E1), the second transmitting terminal pin (B) is used to connect said constant voltage source (VCC), the first feedback end pin (C) is connected to said first transport and placing device (E1) input negative terminal, the second feedback end pin (D) and is used for that ground connection, the second receiving end pin (F) are connected with the input negative terminal of said second transport and placing device (E2), the second receiving end pin (F) also is connected with the output terminal of said second transport and placing device (E2) through second resistance (R2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205486516U CN202393454U (en) | 2011-12-23 | 2011-12-23 | Acquisition circuit of oil level sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205486516U CN202393454U (en) | 2011-12-23 | 2011-12-23 | Acquisition circuit of oil level sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202393454U true CN202393454U (en) | 2012-08-22 |
Family
ID=46668370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205486516U Expired - Fee Related CN202393454U (en) | 2011-12-23 | 2011-12-23 | Acquisition circuit of oil level sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202393454U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102865909A (en) * | 2012-09-12 | 2013-01-09 | 安徽江淮汽车股份有限公司 | Detection circuit for motormeter |
| CN108917878A (en) * | 2018-08-07 | 2018-11-30 | 江西清华泰豪三波电机有限公司 | A kind of device and method changing resistive sensor resistance size |
-
2011
- 2011-12-23 CN CN2011205486516U patent/CN202393454U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102865909A (en) * | 2012-09-12 | 2013-01-09 | 安徽江淮汽车股份有限公司 | Detection circuit for motormeter |
| CN102865909B (en) * | 2012-09-12 | 2014-07-16 | 安徽江淮汽车股份有限公司 | Detection circuit for motormeter |
| CN108917878A (en) * | 2018-08-07 | 2018-11-30 | 江西清华泰豪三波电机有限公司 | A kind of device and method changing resistive sensor resistance size |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120822 Termination date: 20151223 |
|
| EXPY | Termination of patent right or utility model |