CN107782407A - A kind of fuel-quantity transducer and oil mass detection circuit - Google Patents
A kind of fuel-quantity transducer and oil mass detection circuit Download PDFInfo
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- CN107782407A CN107782407A CN201710813556.6A CN201710813556A CN107782407A CN 107782407 A CN107782407 A CN 107782407A CN 201710813556 A CN201710813556 A CN 201710813556A CN 107782407 A CN107782407 A CN 107782407A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Level Indicators Using A Float (AREA)
Abstract
The invention discloses a kind of fuel-quantity transducer, including slide rheostat, the first diode and the second diode, first diode and the second diode reverse are arranged at the both ends of the slide rheostat；The present invention, which also opens, discloses a kind of detection circuit with the fuel-quantity transducer, including the fuel-quantity transducer and sampling module, the sampling module include single-chip microcomputer and divider resistance.Using the present invention, the precision and reliability of sensor are improved on the basis of low cost, additionally it is possible to which detection circuit when extending the service life of sensor, and applying is simply efficient.
Description
Technical field
The present invention relates to a kind of detection technique field, more particularly to a kind of fuel-quantity transducer and oil mass detection circuit.
Background technology
Currently conventional car fuel quantity sensor is as shown in figure 5, be two line swept resistance formula sensors.It is but long
After time use, the contact of two line swept resistance formula sensors is oxidized easily, and contact value becomes big, directly results in sampling end and adopts
Resistance it is bigger than normal, cause fuel contents gauge not calculated accurately really.Also, the problem is irrecoverable after occurring, it is necessary to which more emat sensor could solve
Certainly.And sensor is arranged in fuel tank, replacing difficulty is big, therefore causes very big waste of human resource and old sensor material
The wasting of resources.
At present, three line swept resistance formulas can be changed into by increasing a wire on the basis of original slide rheostat
Sensor eliminates contact error.But because fuel-quantity transducer is arranged in fuel tank, the general part for gathering oil mass is automobile
Instrument, the fuel tank of different automobile types to the distance of instrument is about 1m to 4m, or even longer.Therefore, three lines for increasing a wire are slided
Cost increase caused by dynamic resistance sensor is also very high.
The content of the invention
In order to solve the above-mentioned technical problem, the invention provides a kind of fuel-quantity transducer, the fuel-quantity transducer includes sliding
Dynamic rheostat R1, the first diode D1With the second diode D2；The slide rheostat R1Including first end, the second end and slip
End；
The slide rheostat R1First end and the first diode D1Positive pole be connected, the slide rheostat R1
The second end and the second diode D2Negative pole be connected, the slide rheostat R1Sliding end can change with oil mass
And move, the first diode D1Negative pole and the second diode D2Positive pole be connected.
Further, the first diode D1With the second diode D2Model is identical.
Further, electric current flows through the first diode D1With the second diode D2When, forward direction circulation, reversely cut
Only.
Correspondingly, present invention also offers a kind of detection circuit with above-mentioned fuel-quantity transducer, including the oil mass to pass
Sensor and sampling module, the sampling module include single-chip microcomputer and divider resistance R2；
The divider resistance R2One end and the slide rheostat R1Sliding end be connected, the divider resistance R2It is another
One end is connected with the PA1 pins of the single-chip microcomputer；The slide rheostat R1ADC of the sliding end also with the single-chip microcomputer
It is connected；The first diode D1Negative pole be connected with the PA2 pins of the single-chip microcomputer；The second diode D2Positive pole
It is connected with the PA2 pins of the single-chip microcomputer.
Further, the fuel-quantity transducer is arranged in fuel tank, and the sampling module is arranged in instrument.
Further, the slip terminal contacts of the slide rheostat can be equivalent to equivalent resistance R in the loop0。
Further, the power port of the single-chip microcomputer connects high voltage V respectivelyccAnd the earth.
Further, the detection circuit includes the first current loop and the second current loop.
Specifically, first current loop passes through the divider resistance R successively since the PA1 pins of single-chip microcomputer2, it is sliding
Dynamic rheostat R1Sliding end and first end between resistance R21, the first diode D1Until the PA2 pins of single-chip microcomputer；
Specifically, second current loop passes through the second diode D successively since the PA2 pins of single-chip microcomputer2, slide
Rheostat R1The second end and sliding end between resistance R32, divider resistance R2Until the PA1 pins of single-chip microcomputer.
Further, when the output of PA1 pins is high level, and the output of PA2 pins is low level, the detection circuit is formed
First current loop；When the output of PA1 pins is low level, and the output of PA2 pins is high level, the detection circuit is formed
Second current loop.
Further, the PA1 pins and the high level of PA2 pins output are Vcc, the low level of output is 0V；Institute
State VccFor the supply voltage of single-chip microcomputer work.
Further, the slide rheostat corresponds to resistance of the resistance of real-time oil quantity between first end and sliding end
Value.
In the detection circuit of the present invention, R1It is known for total resistance of swept resistance；R2For the resistance of divider resistance, it is
It is known；VdIt is known for the conducting voltage of general-purpose diode；PA1, PA2 are MCU common I/O port, and it exports high level H
It is respectively V with low level L voltagesccAnd 0V.
Work as PA1=H, during PA2=L, form the first current loop, now Chip Microcomputer A/D C mouths detect voltage Vad1, draw
Equation：
Work as PA1=L, during PA2=H, form the second current loop, now Chip Microcomputer A/D C mouths detect electric Vad2, draw
Formula：
Due to R12With R23And be swept resistance total value, then have equation：
R1=R21+R32(3)
In equation (1), (2), (3), R0、R21With R32To be unknown.
To sum up three formulas (1) (2) (3), it is as follows that three unknown numbers can be calculated：
Therefore, increased loop allows sampling end to calculate the effective resistance R that oil pump capacity corresponds to swept resistance12, and
The inside does not include contact resistance part R0, so as to eliminate deviation.
The present invention has the advantages that：
(1) this invention removes deviation caused by contact resistance so that sensor long-play also can accurate measurement oil
Amount, extend sensor life-time, avoid unnecessary waste, economize on resources, meet green theory.
(2) the more traditional two lines swept resistance formula sensor of this sensor merely add two general-purpose diodes, and its is increased
Cost is far below the increased cost of three wire sensor institute.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art and advantage, below will be to implementing
The required accompanying drawing used is briefly described in example or description of the prior art, it should be apparent that, drawings in the following description are only
Only it is some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the circuit equivalent figure of fuel-quantity transducer first embodiment of the present invention；
Fig. 2 is the equivalent circuit diagram of oil mass detection circuit first embodiment of the present invention；
Fig. 3 is the circuit equivalent figure of fuel-quantity transducer second embodiment of the present invention；
Fig. 4 is the equivalent circuit diagram of oil mass detection circuit second embodiment of the present invention；
Fig. 5 is the circuit equivalent figure of traditional two line fuel-quantity transducers.
Wherein, accompanying drawing correspondence markings are in figure：1- sampling modules；The first end of 101- slide rheostats；102-, which is slided, to be become
Hinder the sliding end of device；Second end of 103- slide rheostats；2- fuel-quantity transducers；201- single-chip microcomputers；The current loops of 3- first；4-
Second current loop.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with accompanying drawing
It is described in detail on step ground.Obviously, described embodiment is only one embodiment of the invention, rather than whole embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are obtained all on the premise of creative work is not made
Other embodiment, belong to the scope of protection of the invention.
Embodiment one：
As shown in figure 1, the invention provides a kind of fuel-quantity transducer, the sensor 1 includes slide rheostat R1, first
Diode D1With the second diode D2；The slide rheostat R1Including first end 101, the second end 103 and sliding end 102；
The slide rheostat R1The diode D of first end 101 and first1Positive pole be connected, the slide rheostat R1's
Second end 103 and the second diode D2Negative pole be connected, the slide rheostat R1Sliding end 102 can change with oil mass
And move, the first diode D1Negative pole and the second diode D2Positive pole be connected.
Further, the first diode D1With the second diode D2Model is identical.
Further, electric current flows through the first diode D1With the second diode D2When, forward direction circulation, reversely cut
Only.
As shown in Fig. 2 correspondingly, present invention also offers a kind of detection circuit with above-mentioned fuel-quantity transducer, including
The fuel-quantity transducer and sampling module, the sampling module include single-chip microcomputer (201) MCU and divider resistance R2；
The divider resistance R2One end and the slide rheostat R1Sliding end 102 be connected, the divider resistance R2It is another
One end is connected with the PA1 pins of the single-chip microcomputer 201；The slide rheostat R1Sliding end 102 also with the single-chip microcomputer 201
ADC be connected；The first diode D1Negative pole be connected with the PA2 pins of the single-chip microcomputer 201；Two or two pole
Pipe D2PA2 pin of the positive pole also with the single-chip microcomputer 201 be connected.
Further, the fuel-quantity transducer is arranged in fuel tank, and the sampling module is arranged in instrument.
Further, the slide rheostat R1The contact of sliding end 102 can be equivalent to equivalent resistance R in the loop0。
Further, the detection circuit includes the first current loop 3 and the second current loop 4.
Specifically, first current loop 3 passes through the divider resistance successively since the PA1 pins of single-chip microcomputer 201
R2, slide rheostat R1Sliding end 102 and first end 101 between resistance R21, the first diode D1Until single-chip microcomputer 201
PA2 pins；
Specifically, second current loop 4 passes through the second diode D successively since the PA2 pins of single-chip microcomputer 2012、
Slide rheostat R1The second end 103 and sliding end 102 between resistance R32, divider resistance R2Until the PA1 of single-chip microcomputer 201 draws
Pin.
Further, when the output of PA1 pins is high level, and the output of PA2 pins is low level, the detection circuit is formed
First current loop 3；When the output of PA1 pins is low level, and the output of PA2 pins is high level, the detection circuit shape
Into second current loop 4.
Further, the PA1 pins and the high level of PA2 pins output are Vcc, the low level of output is 0V；Institute
State VccThe supply voltage to be worked for single-chip microcomputer 201.
Further, the slide rheostat R1Corresponding to real-time oil quantity resistance for first end 101 and sliding end 102 it
Between resistance.
In the detection circuit of the present invention, R1It is known for total resistance of swept resistance；R2For the resistance of divider resistance, it is
It is known；VdIt is known for the conducting voltage of general-purpose diode；PA1, PA2 are MCU common I/O port, and it exports high level H
It is respectively V with low level L voltagesccAnd 0V.
Work as PA1=H, during PA2=L, form the first current loop of loop 3, now single-chip microcomputer 201ADC mouths detect voltage
Vad1, draw equation：
Work as PA1=L, during PA2=H, form the second current loop 4, now single-chip microcomputer 201ADC mouths detect electric Vad2, obtain
Go out equation：
Due to R21With R32And be swept resistance total value, then have equation：
R1=R21+R32(3)
In equation (1), (2), (3), R0、R21With R32To be unknown.
To sum up three formulas (1) (2) (3), it is as follows that three unknown numbers can be calculated：
Therefore, increased loop allows sampling end to calculate the effective resistance R that oil pump capacity corresponds to swept resistance21, and
The inside does not include contact resistance part R0, so as to eliminate deviation.
Embodiment two：
As shown in figure 3, the invention provides a kind of fuel-quantity transducer, including slide rheostat R1, the first diode D1With
Two diode D2；The slide rheostat R1Including first end 101, the second end 103 and sliding end 102；
The slide rheostat R1The diode D of first end 101 and first1Negative pole be connected, the slide rheostat R1's
Second end 103 and the second diode D2Positive pole be connected, the slide rheostat R1Sliding end 102 can change with oil mass
And move, the first diode D1Positive pole and the second diode D2Negative pole be connected.
Further, the first diode D1With the second diode D2Model is identical.
Further, electric current flows through the first diode D1With the second diode D2When, forward direction circulation, reversely cut
Only.
As shown in figure 4, correspondingly, present invention also offers a kind of detection circuit with above-mentioned fuel-quantity transducer, including
The fuel-quantity transducer and sampling module, the sampling module include single-chip microcomputer 201 and divider resistance R2；
The divider resistance R2One end and the slide rheostat R1Sliding end 102 be connected, the divider resistance R2It is another
One end is connected with the PA1 pins of the single-chip microcomputer 201；The slide rheostat R1Sliding end 102 also with the single-chip microcomputer 201
ADC be connected；The first diode D1Positive pole be connected with the PA2 pins of the single-chip microcomputer 201；Two or two pole
Pipe D2PA2 pin of the negative pole also with the single-chip microcomputer 201 be connected.
Further, the fuel-quantity transducer 1 is arranged in fuel tank, and the sampling module 4 is arranged in instrument.
Further, the slide rheostat R1The contact of sliding end 102 can be equivalent to equivalent resistance R in the loop0。
Further, the detection circuit includes the first current loop 3 and the second current loop 4.
Specifically, first current loop 3 passes through the divider resistance successively since the PA1 pins of single-chip microcomputer 201
R2, slide rheostat R1The end 103 of sliding end 102 and second between resistance R23, the second diode D2Until single-chip microcomputer 201
PA2 pins；
Specifically, second current loop 4 passes through the first diode D successively since the PA2 pins of single-chip microcomputer 2011、
Slide rheostat R1First end 101 and sliding end 102 between resistance R12, divider resistance R2Until the PA1 of single-chip microcomputer 201 draws
Pin.
Further, when the output of PA1 pins is high level, and the output of PA2 pins is low level, the detection circuit is formed
First current loop 3；When the output of PA1 pins is low level, and the output of PA2 pins is high level, the detection circuit shape
Into second current loop 4.
Further, the PA1 pins and the high level of PA2 pins output are Vcc, the low level of output is 0V；Institute
State VccThe supply voltage to be worked for single-chip microcomputer 201.
Further, the slide rheostat R1Corresponding to real-time oil quantity resistance for first end 101 and sliding end 102 it
Between resistance.
In the detection circuit of the present invention, R1It is known for total resistance of swept resistance；R2For the resistance of divider resistance, it is
It is known；VdIt is known for the conducting voltage of general-purpose diode；PA1, PA2 are MCU common I/O port, and it exports high level H
It is respectively V with low level L voltagesccAnd 0V.
Work as PA1=H, during PA2=L, form the first current loop, now the ADC mouths of single-chip microcomputer 201 detect voltage Vad1,
Draw equation：
Work as PA1=L, during PA2=H, form the second current loop, now the ADC mouths of single-chip microcomputer 201 detect electric Vad2, obtain
Go out equation：
Due to R12With R23And be swept resistance total value, then have equation：
R1=R12+R23(3)
In equation (1), (2), (3), R0、R12With R23To be unknown.
To sum up three formulas (1) (2) (3), it is as follows that three unknown numbers can be calculated：
Therefore, increased loop allows sampling end to calculate the effective resistance R that oil pump capacity corresponds to swept resistance12, and
The inside does not include contact resistance part R0, so as to eliminate deviation.
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (10)
1. a kind of fuel-quantity transducer, it is characterised in that the fuel-quantity transducer (1) includes slide rheostat R1, the first diode D1
With the second diode D2；The slide rheostat R1Including first end (101), the second end (103) and sliding end (102)；
The slide rheostat R1First end (101) and the first diode D1Positive pole be connected, the slide rheostat R1
The second end (103) and the second diode D2Negative pole be connected, the slide rheostat R1Sliding end (102) can be with
Oil mass change and move, the first diode D1Negative pole and the second diode D2Positive pole be connected.
A kind of 2. fuel-quantity transducer according to claim 1, it is characterised in that the first diode D1With described second
Diode D2Model is identical.
3. a kind of oil mass detection circuit, it is characterised in that including the fuel-quantity transducer (1) described in claim 1-2 any one
With sampling module (2), the sampling module includes single-chip microcomputer (201) and divider resistance R2；
The divider resistance R2One end and the slide rheostat R1Sliding end (102) be connected, the divider resistance R2It is another
One end is connected with the PA1 pins of the single-chip microcomputer (201)；The slide rheostat R1Sliding end (102) also with the monolithic
The ADC of machine (201) is connected；The first diode D1Negative pole be connected with the PA2 pins of the single-chip microcomputer (201)；Institute
State the second diode D2PA2 pin of the positive pole also with the single-chip microcomputer (201) be connected.
4. a kind of detection circuit according to claim 3, it is characterised in that the fuel-quantity transducer (1) is arranged at fuel tank
In, the sampling module (2) is arranged in instrument.
A kind of 5. detection circuit according to claim 3, it is characterised in that the slide rheostat R1Sliding end (102)
Contact can be equivalent to equivalent resistance R in the loop0。
6. a kind of detection circuit according to claim 3, it is characterised in that the detection circuit includes the first current loop
And the second current loop (4) (3)；
First current loop (3) passes through the divider resistance R successively since the PA1 pins of single-chip microcomputer (201)2, slide become
Hinder device R1Sliding end (102) and first end (101) between resistance R21, the first diode D1Until the PA2 of single-chip microcomputer (201)
Pin；
Second current loop (4) passes through the second diode D successively since the PA2 pins of single-chip microcomputer (201)2, slide variable resistance
Device R1The second end (103) and sliding end (102) between resistance R32, divider resistance R2Until the PA1 of single-chip microcomputer (201) draws
Pin.
7. a kind of detection circuit according to claim 6, it is characterised in that when the output of PA1 pins is high level, PA2 draws
When pin output is low level, the detection circuit forms first current loop (3)；It is low level when PA1 pins export,
When the output of PA2 pins is high level, the detection circuit forms second current loop (4).
8. a kind of detection circuit according to claim 7, it is characterised in that the PA1 pins and PA2 pins output
High level be Vcc, the low level of output is 0V；The VccFor the supply voltage of single-chip microcomputer (201) work.
A kind of 9. detection circuit according to claim 3, it is characterised in that the slide rheostat R1Corresponding to real-time oil
Resistance of the resistance of amount between first end (101) and sliding end (102).
10. any one detection circuit according to claim 3-9, it is characterised in that resistance R corresponding to real-time oil quantity21,
It can be obtained by following formula：
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Wherein, VdFor general-purpose diode conducting voltage；R1For the total resistance of slide rheostat；R2For divider resistance resistance；Vad1For electricity
Flow back to the ADC mouth voltages of single-chip microcomputer (201) when road is the first current loop (3)；Vad2It is the second current loop for current loop
(4) the ADC mouth voltages of single-chip microcomputer (201) when.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710813556.6A CN107782407B (en) | 2017-09-11 | 2017-09-11 | Oil mass sensor and oil mass detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710813556.6A CN107782407B (en) | 2017-09-11 | 2017-09-11 | Oil mass sensor and oil mass detection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN107782407A true CN107782407A (en) | 2018-03-09 |
| CN107782407B CN107782407B (en) | 2020-03-24 |
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ID=61438264
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710813556.6A Active CN107782407B (en) | 2017-09-11 | 2017-09-11 | Oil mass sensor and oil mass detection circuit |
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