CN107782407B - Oil mass sensor and oil mass detection circuit - Google Patents

Oil mass sensor and oil mass detection circuit Download PDF

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Publication number
CN107782407B
CN107782407B CN201710813556.6A CN201710813556A CN107782407B CN 107782407 B CN107782407 B CN 107782407B CN 201710813556 A CN201710813556 A CN 201710813556A CN 107782407 B CN107782407 B CN 107782407B
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diode
pin
sliding
oil
current loop
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CN107782407A (en
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吴勉尧
李端阳
黄潇榕
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Huizhou Desay SV Automotive Co Ltd
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Huizhou Desay SV Automotive Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22Indicating 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
    • G01F23/24Indicating 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

Abstract

The invention discloses an oil mass sensor which comprises a sliding rheostat, a first diode and a second diode, wherein the first diode and the second diode are reversely arranged at two ends of the sliding rheostat; the invention also discloses a detection circuit with the oil mass sensor, which comprises the oil mass sensor and a sampling module, wherein the sampling module comprises a singlechip and a divider resistor. The invention improves the precision and reliability of the sensor on the basis of low cost, can also prolong the service life of the sensor, and has simple and efficient detection circuit when in application.

Description

Oil mass sensor and oil mass detection circuit
Technical Field
The invention relates to the technical field of detection, in particular to an oil mass sensor and an oil mass detection circuit.
Background
A currently used fuel level sensor for an automobile is shown in fig. 5, which is a two-wire sliding resistance type sensor. However, after long-time use, the contacts of the two-wire sliding resistance type sensor are easily oxidized, the contact value becomes large, the resistance collected by the sampling end is directly large, and the oil quantity calculation is inaccurate. Moreover, the problem cannot be recovered after occurrence, and the sensor must be replaced to solve the problem. And the sensor is arranged in the oil tank, and the replacement difficulty is high, so that great waste of human resources and waste of old sensor material resources are caused.
At present, a contact error can be eliminated by adding a conducting wire on the basis of the original slide rheostat and changing the conducting wire into a three-wire slide resistance type sensor. However, since the fuel sensor is installed in the fuel tank, the part for collecting fuel is typically an automobile meter, and the distance from the fuel tank to the meter is about 1m to 4m, or even longer, for different vehicle types. Therefore, the cost increase caused by the three-wire sliding resistive sensor with one wire added is also very high.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides an oil amount sensor including a sliding rheostat R1A first diode D1And a second diode D2(ii) a The slide rheostat R1Comprises a first end, a second end and a sliding end;
the slide rheostat R1And the first diode D1Is connected with the positive pole of the sliding rheostat R1And the second terminal of the second diode D2Negative electrode phase ofAnd, the slide rheostat R1Can move with the change of the oil quantity, the first diode D1And the cathode of the second diode D2The positive electrodes of (a) and (b) are connected.
Further, the first diode D1And the second diode D2The models are the same.
Further, a current flows through the first diode D1And the second diode D2When the water flows in the positive direction, the water is stopped in the reverse direction.
Correspondingly, the invention also provides a detection circuit with the oil quantity sensor, which comprises the oil quantity sensor and a sampling module, wherein the sampling module comprises a single chip microcomputer and a divider resistor R2
The voltage-dividing resistor R2And the sliding rheostat R1The sliding end of the voltage dividing resistor R is connected with the sliding end of the voltage dividing resistor R2The other end of the single-chip microcomputer is connected with a PA1 pin of the single-chip microcomputer; the slide rheostat R1The sliding end of the sliding mechanism is also connected with an ADC module of the singlechip; the first diode D1The negative electrode of the single-chip microcomputer is connected with a PA2 pin of the single-chip microcomputer; the second diode D2The anode of the single-chip microcomputer is also connected with a PA2 pin of the single-chip microcomputer.
Further, the oil mass sensor is arranged in the oil tank, and the sampling module is arranged in the instrument.
Further, the sliding end contact of the sliding rheostat can be equivalent to an equivalent resistance R in a loop0
Furthermore, the power supply ports of the single chip microcomputer are respectively connected with a high voltage VccAnd the earth.
Further, the detection circuit includes a first current loop and a second current loop.
Specifically, the first current loop sequentially passes through the voltage dividing resistor R from a PA1 pin of a single chip microcomputer2Sliding rheostat R1Between the sliding end and the first end of the resistor R21A first diode D1To the PA2 pin of the singlechip;
in particular, the method comprises the following steps of,the second current loop sequentially passes through a second diode D from a PA2 pin of the singlechip2Sliding rheostat R1And a resistance R between the second end and the sliding end32A voltage dividing resistor R2To the PA1 pin of the single chip microcomputer.
Further, when the output of the pin PA1 is at a high level and the output of the pin PA2 is at a low level, the detection circuit forms the first current loop; when the output of the pin PA1 is at a low level and the output of the pin PA2 is at a high level, the detection circuit forms the second current loop.
Further, the high level output by the PA1 pin and the PA2 pin is VccThe output low level is 0V; the V isccIs the power supply voltage for the work of the singlechip.
Further, the resistance value of the slide rheostat corresponding to the real-time oil quantity is the resistance value between the first end and the sliding end.
In the detection circuit of the present invention, R1Is the total resistance of the sliding resistor, is known; r2The resistance of the divider resistor is known; vdThe turn-on voltage of a common diode is known; PA1 and PA2 are common IO ports of MCU, and output high level H and low level L voltages are V respectivelyccAnd 0V.
When PA1 equals H and PA2 equals L, a first current loop is formed, and the ADC port of the single chip microcomputer detects a voltage V at the momentad1To derive the equation:
when PA1 equals L and PA2 equals H, a second current loop is formed, and the ADC port of the single chip microcomputer detects the voltage V at the momentad2To derive the equation:
due to R12And R23Is the total value of the sliding resistance, then there is the equation:
R1=R21+R32(3)
in equations (1), (2), (3), R0、R21And R32Is unknown.
From the above three equations (1), (2) and (3), three unknowns can be calculated as follows:
therefore, the added loop enables the sampling end to calculate the effective resistance R of the oil quantity corresponding to the sliding resistance12And does not include therein the contact resistance portion R0Thereby eliminating the deviation.
The invention has the following beneficial effects:
(1) the invention eliminates the deviation caused by contact resistance, ensures that the sensor can accurately measure the oil mass after long-time operation, prolongs the service life of the sensor, avoids unnecessary waste, saves resources and conforms to the concept of environmental protection.
(2) Compared with the traditional two-wire sliding resistance type sensor, the sensor only adds two common diodes, and the added cost is far lower than that of a three-wire sensor.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions and advantages of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a circuit equivalent diagram of a first embodiment of an oil amount sensor according to the present invention;
fig. 2 is an equivalent circuit diagram of a first embodiment of the oil amount detection circuit according to the present invention;
fig. 3 is a circuit equivalent diagram of a second embodiment of the oil amount sensor according to the present invention;
fig. 4 is an equivalent circuit diagram of a second embodiment of the oil amount detection circuit according to the present invention;
fig. 5 is a circuit equivalent diagram of a conventional two-wire oil quantity sensor.
Wherein, the corresponding reference numbers in the figures are: 1-a sampling module; 101-a first end of a sliding varistor; 102-sliding end of sliding varistor; 103-a second end of the sliding varistor; 2-an oil mass sensor; 201-single chip microcomputer; 3-a first current loop; 4-second current loop.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings. It should be apparent that the described embodiment is only one embodiment of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
as shown in FIG. 1, the present invention provides an oil quantity sensor, wherein the sensor 1 comprises a slide rheostat R1A first diode D1And a second diode D2(ii) a The slide rheostat R1Comprises a first end 101, a second end 103 and a sliding end 102;
the slide rheostat R1First terminal 101 and first diode D1Is connected with the positive pole of the sliding rheostat R1Second terminal 103 and second diode D2Is connected to the negative pole of the slide rheostat R1Can move with the change of the oil quantity, the first diode D1And the cathode of the second diode D2The positive electrodes of (a) and (b) are connected.
Further, the first diode D1And stationThe second diode D2The models are the same.
Further, a current flows through the first diode D1And the second diode D2When the water flows in the positive direction, the water is stopped in the reverse direction.
As shown in fig. 2, correspondingly, the invention also provides a detection circuit with the oil quantity sensor, which comprises the oil quantity sensor and a sampling module, wherein the sampling module comprises a single chip microcomputer (201) MCU and a voltage division resistor R2
The voltage-dividing resistor R2One end of the slide rheostat R1Is connected to the sliding end 102, and the voltage dividing resistor R2The other end of the single-chip microcomputer 201 is connected with a PA1 pin of the single-chip microcomputer 201; the slide rheostat R1The sliding end 102 of the single chip microcomputer 201 is also connected with an ADC module of the single chip microcomputer; the first diode D1The negative electrode of the single-chip microcomputer 201 is connected with a PA2 pin of the single-chip microcomputer 201; the second diode D2And the anode of the single chip microcomputer 201 is also connected with a pin PA2 of the single chip microcomputer.
Further, the oil mass sensor is arranged in the oil tank, and the sampling module is arranged in the instrument.
Further, the slide rheostat R1The sliding end 102 contact of (a) can be equivalent to an equivalent resistance R in a loop0
Further, the detection circuit comprises a first current loop 3 and a second current loop 4.
Specifically, the first current loop 3 sequentially passes through the voltage dividing resistor R from a pin PA1 of the single chip microcomputer 2012Sliding rheostat R1Between the sliding end 102 and the first end 10121A first diode D1To the PA2 pin of the single chip 201;
specifically, the second current loop 4 sequentially passes through the second diode D from a pin PA2 of the single chip 2012Sliding rheostat R1And the resistance R between the second end 103 and the sliding end 10232A voltage dividing resistor R2Up to the PA1 pin of the single chip 201.
Further, when the pin output of the PA1 is at a high level and the pin output of the PA2 is at a low level, the detection circuit forms the first current loop 3; when the pin output of the PA1 is at a low level and the pin output of the PA2 is at a high level, the detection circuit forms the second current loop 4.
Further, the high level output by the PA1 pin and the PA2 pin is VccThe output low level is 0V; the V isccWhich is the supply voltage for the operation of the single chip 201.
Further, the slide rheostat R1The resistance value corresponding to the real time oil amount is the resistance value between the first terminal 101 and the sliding terminal 102.
In the detection circuit of the present invention, R1Is the total resistance of the sliding resistor, is known; r2The resistance of the divider resistor is known; vdThe turn-on voltage of a common diode is known; PA1 and PA2 are common IO ports of MCU, and output high level H and low level L voltages are V respectivelyccAnd 0V.
When PA1 is H and PA2 is L, a first current loop 3 is formed, and at this time, the ADC port of the single chip 201 detects a voltage Vad1To derive the equation:
when PA1 is L and PA2 is H, a second current loop 4 is formed, and at this time, the ADC port of the single chip 201 detects the voltage Vad2To derive the equation:
due to R21And R32Is the total value of the sliding resistance, then there is the equation:
R1=R21+R32(3)
in equations (1), (2), (3), R0、R21And R32Is unknown.
From the above three equations (1), (2) and (3), three unknowns can be calculated as follows:
therefore, the added loop enables the sampling end to calculate the effective resistance R of the oil quantity corresponding to the sliding resistance21And does not include therein the contact resistance portion R0Thereby eliminating the deviation.
Example two:
as shown in fig. 3, the present invention provides an oil amount sensor including a sliding rheostat R1A first diode D1And a second diode D2(ii) a The slide rheostat R1Comprises a first end 101, a second end 103 and a sliding end 102;
the slide rheostat R1First terminal 101 and first diode D1Is connected to the negative pole of the slide rheostat R1Second terminal 103 and second diode D2Is connected with the positive pole of the sliding rheostat R1Can move with the change of the oil quantity, the first diode D1And the second diode D2Are connected with each other.
Further, the first diode D1And the second diode D2The models are the same.
Further, a current flows through the first diode D1And the second diode D2When the water flows in the positive direction, the water is stopped in the reverse direction.
As shown in fig. 4, correspondingly, the invention further provides a detection circuit with the oil quantity sensor, which comprises the oil quantity sensor and a sampling module, wherein the sampling module comprises a single chip microcomputer 201 and a voltage dividing resistor R2
The voltage-dividing resistor R2One end of the slide rheostat R1Is connected to the sliding end 102, and the voltage dividing resistor R2The other end of the single-chip microcomputer 201 is connected with a PA1 pin of the single-chip microcomputer 201; the slide rheostat R1The sliding end 102 of the single chip microcomputer 201 is also connected with an ADC module of the single chip microcomputer; the first diode D1The anode of the single-chip microcomputer 201 is connected with a PA2 pin of the single-chip microcomputer 201; the second diode D2And the negative electrode of the single chip microcomputer 201 is also connected with a pin PA2 of the single chip microcomputer.
Further, the oil quantity sensor 1 is arranged in the oil tank, and the sampling module 4 is arranged in the instrument.
Further, the slide rheostat R1The sliding end 102 contact of (a) can be equivalent to an equivalent resistance R in a loop0
Further, the detection circuit comprises a first current loop 3 and a second current loop 4.
Specifically, the first current loop 3 sequentially passes through the voltage dividing resistor R from a pin PA1 of the single chip microcomputer 2012Sliding rheostat R1Between the sliding end 102 and the second end 10323A second diode D2To the PA2 pin of the single chip 201;
specifically, the second current loop 4 sequentially passes through the first diode D from a pin PA2 of the single chip 2011Sliding rheostat R1Between the first end 101 and the sliding end 102 of the resistor R12A voltage dividing resistor R2Up to the PA1 pin of the single chip 201.
Further, when the pin output of the PA1 is at a high level and the pin output of the PA2 is at a low level, the detection circuit forms the first current loop 3; when the pin output of the PA1 is at a low level and the pin output of the PA2 is at a high level, the detection circuit forms the second current loop 4.
Further, the high level output by the PA1 pin and the PA2 pin is VccThe output low level is 0V; the V isccWhich is the supply voltage for the operation of the single chip 201.
Further, the slide rheostat R1Resistance corresponding to real-time oil massIs the resistance between the first end 101 and the sliding end 102.
In the detection circuit of the present invention, R1Is the total resistance of the sliding resistor, is known; r2The resistance of the divider resistor is known; vdThe turn-on voltage of a common diode is known; PA1 and PA2 are common IO ports of MCU, and output high level H and low level L voltages are V respectivelyccAnd 0V.
When PA1 is H and PA2 is L, a first current loop is formed, and at this time, the ADC port of the single chip 201 detects the voltage Vad1To derive the equation:
when PA1 is L and PA2 is H, a second current loop is formed, and at this time, the ADC port of the single chip 201 detects the voltage Vad2To derive the equation:
due to R12And R23Is the total value of the sliding resistance, then there is the equation:
R1=R12+R23(3)
in equations (1), (2), (3), R0、R12And R23Is unknown.
From the above three equations (1), (2) and (3), three unknowns can be calculated as follows:
thus, increased circuit yieldThe sample end can calculate the effective resistance R of the oil output corresponding to the sliding resistance12And does not include therein the contact resistance portion R0Thereby eliminating the deviation.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (10)

1. Oil quantity sensor, characterized in that the oil quantity sensor (1) comprises a slide rheostat R1A first diode D1And a second diode D2(ii) a The slide rheostat R1Comprises a first end (101), a second end (103) and a sliding end (102);
the slide rheostat R1And the first terminal (101) of the first diode D1Is connected with the positive pole of the sliding rheostat R1And a second terminal (103) of the second diode D2Is connected to the negative pole of the slide rheostat R1Can move with the change of the oil quantity, the first diode D1And the cathode of the second diode D2The positive electrodes of (a) and (b) are connected.
2. The fuel level sensor of claim 1 wherein said first diode D1And the second diode D2The models are the same.
3. An oil quantity detection circuit, characterized by comprising the oil quantity sensor (1) of any one of claims 1-2 and a sampling module (2), wherein the sampling module comprises a single chip microcomputer (201) and a voltage dividing resistor R2
The voltage-dividing resistor R2And the sliding rheostat R1Is connected with the sliding end (102), and the voltage dividing resistor R2The other end of the single-chip microcomputer (201) is connected with a PA1 pin of the single-chip microcomputer (201); the slide rheostat R1The sliding end (102) of the single chip microcomputer(201) The ADC modules are connected; the first diode D1The negative electrode of the single-chip microcomputer (201) is connected with a PA2 pin of the single-chip microcomputer (201); the second diode D2The positive pole of the single-chip microcomputer (201) is also connected with a PA2 pin of the single-chip microcomputer.
4. A fuel quantity detection circuit according to claim 3, characterized in that the fuel quantity sensor (1) is arranged in a fuel tank and the sampling module (2) is arranged in a meter.
5. The oil quantity detecting circuit of claim 3, wherein the slide rheostat R1Can be equivalent to an equivalent resistance R in a loop0
6. A fuel quantity detection circuit according to claim 3, characterized in that the detection circuit comprises a first current loop (3) and a second current loop (4);
the first current loop (3) sequentially passes through the voltage division resistor R from a PA1 pin of the singlechip (201)2Sliding rheostat R1Between the sliding end (102) and the first end (101) of the resistor (R)21A first diode D1To a PA2 pin of the singlechip (201);
the second current loop (4) sequentially passes through a second diode D from a PA2 pin of the singlechip (201)2Sliding rheostat R1And the resistance R between the second end (103) and the sliding end (102)32A voltage dividing resistor R2To the PA1 pin of the singlechip (201).
7. The oil amount detecting circuit according to claim 6, wherein the detecting circuit forms the first current loop (3) when the pin output of PA1 is high and the pin output of PA2 is low; the detection circuit forms the second current loop (4) when the pin output of PA1 is low and the pin output of PA2 is high.
8. According to claimThe oil quantity detection circuit of claim 7, characterized in that the high level output by the pin PA1 and the pin PA2 is VccThe output low level is 0V; the V isccThe power supply voltage for the work of the singlechip (201).
9. The oil quantity detecting circuit of claim 3, wherein the slide rheostat R1The resistance value corresponding to the real time oil amount is the resistance value between the first terminal (101) and the sliding terminal (102).
10. The fuel quantity detection circuit according to claim 8, wherein the resistance R corresponding to the real-time fuel quantity21It can be obtained by the following formula:
wherein, VdIs a common diode turn-on voltage; r1The total resistance value of the slide rheostat; r2Is the resistance value of the divider resistor; vad1When the current loop is the first current loop (3), the voltage of an ADC port of the singlechip (201); vad2When the current loop is the second current loop (4), the voltage of the ADC port of the singlechip (201) is obtained.
CN201710813556.6A 2017-09-11 2017-09-11 Oil mass sensor and oil mass detection circuit Active CN107782407B (en)

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