CN110887544A - Combined type fuel sensor - Google Patents
Combined type fuel sensor Download PDFInfo
- Publication number
- CN110887544A CN110887544A CN201911193791.3A CN201911193791A CN110887544A CN 110887544 A CN110887544 A CN 110887544A CN 201911193791 A CN201911193791 A CN 201911193791A CN 110887544 A CN110887544 A CN 110887544A
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- Prior art keywords
- sensor
- resistor
- guide rod
- signal processor
- mounting box
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Classifications
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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
- G01F23/26—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
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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
- G01F23/30—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 floats
- G01F23/64—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 floats of the free float type without mechanical transmission elements
- G01F23/72—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 floats of the free float type without mechanical transmission elements using magnetically actuated indicating means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
Abstract
The invention relates to a composite fuel sensor, which comprises an oil tank shell, a mounting box, a guide rod, a temperature sensor, a liquid level sensor and an oil mass sensor, wherein the mounting box is arranged on the oil tank shell; the top end opening of the oil tank shell is hermetically connected with the bottom of the mounting box; the guide rod is arranged in the oil tank shell, the guide rod is hollow, the top of the guide rod is fixed in the chassis of the mounting box, and the bottom of the guide rod is connected with the bottom of the space in the oil tank shell; the temperature sensor is arranged at the bottom end inside the guide rod; the liquid level sensor is movably arranged outside the guide rod; the oil mass sensor is a capacitance type oil mass sensor and comprises a capacitance type sensor anode and a capacitance type sensor cathode; the positive electrode and the negative electrode of the capacitive sensor are wall-shaped structures with the shapes consistent with the shape of the side wall of the oil tank shell; the top ends of the positive electrode and the negative electrode of the capacitive sensor are fixedly sealed in the mounting box, and the bottom ends of the positive electrode and the negative electrode of the capacitive sensor are fixed on the bottom surface of the oil tank shell; the three sensors are combined to realize the weight reduction and the reduction of the occupied space of the equipment.
Description
Technical Field
The invention belongs to the field of aircraft fuel measurement, and particularly relates to a composite fuel sensor.
Background
The fuel oil system has the functions of measuring the fuel oil quantity, the fuel oil temperature, the residual oil warning signals of all fuel tanks and the like of the airplane in real time. The precision and reliability of the fuel system are directly related to the control precision and reliability of an aircraft control system, and further the flight safety of the whole aircraft. With the continuous development of computer simulation, material science and process technology, the requirement of the airplane is continuously improved, and the development of a new-generation fuel system has very important significance for improving the technical and tactical indexes of the whole airplane and meeting the requirement of the airplane. The liquid level measuring sensor is used as an important part of the initial end of the fuel oil measuring system, and fuel oil data, liquid level and temperature information need to be measured and transmitted to a fuel oil management computer in real time, stably and with external interference reduced as much as possible, so that the liquid level measuring sensor has important significance for fuel oil management of an airplane.
At present, 3 products of an oil mass sensor, a temperature sensor and a liquid level annunciator are needed to be installed in a domestic fuel system for measuring fuel oil mass, fuel temperature and liquid level information (liquid level alarm). Under the current trend of weight reduction of the system, the system needs to be synthesized and optimized on the premise of meeting the system functions, so that 1 composite fuel sensor is needed, and the fuel quantity, the fuel temperature and the liquid level can be measured.
Disclosure of Invention
The invention provides a composite fuel sensor based on the requirement of weight reduction of the existing aircraft system, the volume and the weight of the fuel sensor are reduced by arranging an oil quantity sensor, a temperature sensor and a liquid level sensor into a whole, three signals are processed by using the same signal processor in a centralized manner, and the stability of the system is improved while the weight reduction of the system is realized.
The specific implementation content of the invention is as follows:
a composite fuel sensor comprises an oil tank shell, a mounting box, a guide rod, a temperature sensor, a liquid level sensor, an oil mass sensor and an opening;
the top end opening of the oil tank shell is hermetically connected with the bottom of the mounting box;
the guide rod is arranged in the oil tank shell, the guide rod is hollow, the top of the guide rod is fixed in the chassis of the mounting box, and the bottom of the guide rod is connected with the bottom of the space in the oil tank shell;
the temperature sensor is arranged at the bottom end inside the guide rod;
the liquid level sensor is movably arranged outside the guide rod;
the oil mass sensor is a capacitance type oil mass sensor and comprises a capacitance type sensor anode and a capacitance type sensor cathode; the positive electrode and the negative electrode of the capacitive sensor are wall-shaped structures with the shapes consistent with the shape of the side wall of the oil tank shell; the top ends of the positive electrode and the negative electrode of the capacitive sensor are fixedly sealed in the mounting box, and the bottom ends of the positive electrode and the negative electrode of the capacitive sensor are fixed on the bottom surface of the oil tank shell; the openings are formed in the top end and the bottom end of the positive electrode of the capacitive sensor and the bottom end of the negative electrode of the capacitive sensor.
In order to better implement the invention, further, a signal processor is arranged in the mounting box; the signal processor is connected with the temperature sensor and the oil mass sensor through leads;
the lead of the temperature sensor is connected into the mounting box through a guide rod and then connected with the signal processor;
and a lead connected with the anode of the capacitive oil mass sensor and the cathode of the capacitive oil mass sensor is connected with the signal processor through a connection wire from the mounting box.
In order to better implement the present invention, further, the circuit, to which the oil sensor is connected to the signal processor, includes a signal excitation module, a resistor R412, a resistor R417, a resistor R411, the oil sensor, a first signal amplification module, a digital bridge conversion module, and a signal processor;
the signal excitation module is connected with the resistor R412 and then is connected with the oil quantity sensor;
the oil mass sensor is connected with the negative input end of the first signal amplification module after a signal receiving end of the oil mass sensor is connected with a resistor R412 and a signal output end of the oil mass sensor is connected with a resistor R417;
the output end of the first signal amplification module is connected with the resistor R411 and then is connected with the digital bridge conversion module;
the digital bridge conversion module is connected with the signal processor.
In order to better implement the present invention, further, the circuit, to which the temperature sensor is connected to the signal processor, includes a bridge type resistance sensor module, a resistor R303, a resistor R305, a second signal amplification module, a resistor R326, and a voltage follower;
the bridge type resistance sensor module is a bridge type resistance circuit consisting of a temperature sensor, an adjustable resistor RP301, a resistor R301 and a resistor R308;
the negative output end of the bridge-type resistor circuit is connected with a resistor R305 and then is connected with the negative input end of the second signal amplification module, and the positive output end of the bridge-type resistor circuit is connected with a resistor R303 and then is connected with the positive input end of the second signal amplification module;
the output end of the second signal amplification module is connected with the resistor R326 and then is connected with the positive input end of the voltage follower;
and the output end of the voltage follower is connected with the signal processor.
In order to better realize the invention, further, a liquid level alarm circuit is also arranged; the liquid level alarm circuit is positioned in the guide rod and connected with the signal processor, and comprises a resistor R119, a resistor R118, an optocoupler D114, a resistor R117 and a liquid level annunciator;
the ANODE input end of the optocoupler D114 is connected with the resistor R119 and the resistor R118 which are connected in series, and then is connected with an input power supply;
the CATHODE negative input end of the optocoupler D114 and the EMITTOR emission collector terminal are grounded;
the COLLECTOR terminal of the optocoupler D114 is connected with the signal processor;
the liquid level annunciator is a switching signal and is connected with a node between the resistor R119 and the resistor R118 and a COLLECTOR terminal of a COLLECTOR of the optocoupler D115;
and the resistor R117 is connected with a power supply and then connected into a signal processor.
In order to better realize the invention, further, a magnet is arranged in the liquid level sensor, and the liquid level annunciator is a dry spring which can be attracted by the magnet; the dry spring is fixedly arranged in the guide rod.
In order to better implement the invention, further, the mounting box is machined from an anodized and surface painted monolithic aluminum alloy.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1) the weight of the equipment is reduced;
2) the space occupied by the equipment is reduced;
3) the system runs stably.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of a connection circuit between the signal processor and the oil sensor;
FIG. 3 is a schematic diagram of a connection circuit between the signal processor and the temperature sensor;
FIG. 4 is a schematic diagram of a connection circuit between the signal processor and the liquid level annunciator;
fig. 5 is a schematic view of two bottom ends of two poles of a capacitive sensor provided with openings.
Wherein: 1. oil tank casing, 2, mounting box, 3, signal processor, 4, guide arm, 5, temperature sensor, 6, level sensor, 7, oil mass sensor, 8, capacitive sensor positive pole, 9, capacitive sensor negative pole, 10, dry spring, 11, opening.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and therefore should not be considered as a limitation to the scope of protection. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
a composite fuel sensor is shown in figures 1 and 5 and comprises a fuel tank shell 1, a mounting box 2, a guide rod 4, a temperature sensor 5, a liquid level sensor 6, a fuel quantity sensor 7 and an opening 11;
the top end opening of the oil tank shell 1 is hermetically connected with the bottom of the mounting box 2;
the guide rod 4 is arranged in the oil tank shell 1, the guide rod 4 is hollow, the top of the guide rod 4 is fixed in the chassis of the mounting box 2, and the bottom of the guide rod is connected with the bottom of the space in the oil tank shell 1;
the temperature sensor 5 is arranged at the bottom end inside the guide rod 4;
the liquid level sensor 6 is movably arranged outside the guide rod 4;
the oil mass sensor 7 is a capacitance type oil mass sensor and comprises a capacitance type sensor anode 8 and a capacitance type sensor cathode 9; the positive electrode 8 and the negative electrode 9 of the capacitive sensor are wall-shaped structures which are consistent with the side wall of the oil tank shell 1 in shape; the top ends of the positive electrode 8 and the negative electrode 9 of the capacitive sensor are fixedly sealed in the mounting box 2, and the bottom ends of the positive electrode and the negative electrode are fixed on the bottom surface of the oil tank shell 1; the openings 11 are arranged at the top end and the bottom end of the positive electrode 8 and the negative electrode 9 of the capacitive sensor.
The working principle is as follows: the liquid level sensor 6, the temperature sensor 5 and the fuel quantity sensor 7 are arranged together, so that the occupied volume and the weight of equipment are reduced, the positive electrode and the negative electrode are both arranged into wall-shaped structures with the same shapes as the side walls of the oil tank shell 1, openings are arranged at the upper end and the lower end of two-pole wall plates, so that fuel can be fully and comprehensively contacted with two poles of the capacitive fuel quantity sensor, and the capacitive fuel quantity sensor can sense the change of the fuel in the whole oil tank; the temperature sensor 5 is arranged at the bottom of the guide rod 4 and used for detecting the change of the fuel level by a temperature liquid level sensor 6 at the bottom of the fuel tank.
Example 2:
in order to better implement the present invention, further, as shown in fig. 1, a signal processor 3 is provided in the mounting box 2; the signal processor 3 is connected with the temperature sensor 5 and the oil quantity sensor 7 through leads;
the lead of the temperature sensor 5 is connected into the mounting box 2 through a guide rod 4 and then connected with the signal processor 3;
and a lead connected with the anode 8 of the capacitive oil mass sensor and the cathode 9 of the capacitive oil mass sensor is connected with the signal processor 3 from the mounting box 2.
The working principle is as follows: the signal processor 3 is arranged in the mounting box 2, so that fuel in the fuel tank shell 1 can be isolated from contacting the signal processor 3.
Other parts of this embodiment are the same as those of embodiment 1, and thus are not described again.
Example 3:
on the basis of any one of the above embodiments 1-2, in order to better implement the present invention, as shown in fig. 1, fig. 2, fig. 3 and fig. 4, further, a circuit, to which the oil quantity sensor 7 is connected with the signal processor 3, includes a signal excitation module, a resistor R412, a resistor R417, a resistor R411, an oil quantity sensor, a first signal amplification module, a digital bridge conversion module, and the signal processor 3;
the signal excitation module is connected with the resistor R412 and then is connected with the oil quantity sensor 7;
the oil mass sensor 7 is connected with the negative input end of the first signal amplification module after receiving a signal end and connecting a resistor R412 and an output signal end and connecting a resistor R417;
the output end of the first signal amplification module is connected with the resistor R411 and then is connected with the digital bridge conversion module;
the digital bridge conversion module is connected with the signal processor 3;
the circuit connected with the temperature sensor 5 and the signal processor 3 comprises a bridge type resistance sensor module, a resistor R303, a resistor R305, a second signal amplification module, a resistor R326 and a voltage follower;
the bridge type resistance sensor module is a bridge type resistance circuit consisting of a temperature sensor 5, an adjustable resistor RP301, a resistor R301 and a resistor R308;
the negative output end of the bridge-type resistor circuit is connected with a resistor R305 and then is connected with the negative input end of the second signal amplification module, and the positive output end of the bridge-type resistor circuit is connected with a resistor R303 and then is connected with the positive input end of the second signal amplification module;
the output end of the second signal amplification module is connected with the resistor R326 and then is connected with the positive input end of the voltage follower;
the output end of the voltage follower is connected with the signal processor 3;
further, a liquid level alarm circuit is also arranged; the liquid level alarm circuit is positioned in the guide rod 4 and connected with the signal processor 3, and comprises a resistor R119, a resistor R118, an optical coupler D114, a resistor R117 and a liquid level annunciator;
the ANODE input end of the optocoupler D114 is connected with the resistor R119 and the resistor R118 which are connected in series, and then is connected with an input power supply;
the CATHODE negative input end of the optocoupler D114 and the EMITTOR emission collector terminal are grounded;
the COLLECTOR terminal of the optocoupler D114 is connected with the signal processor 3;
the liquid level annunciator is a switching signal and is connected with a node between the resistor R119 and the resistor R118 and a COLLECTOR terminal of a COLLECTOR of the optocoupler D115;
the resistor R117 is connected with a power supply and then connected into the signal processor 3.
The working principle is as follows: the positive electrode 8 of the capacitive oil mass sensor and the negative electrode 9 of the capacitive oil mass sensor of the oil mass sensor 7 are inserted into fuel oil, excitation signals with different changes can be fed back according to the change of the fuel oil, the oil mass sensor 7 feeds back different capacitance signals to the first signal amplification module according to the different excitation signals, the first signal amplification module amplifies the weak capacitance signal change in proportion and transmits the amplified capacitance signal change to the digital bridge conversion module, and then the amplified capacitance signal change is transmitted to the signal processor 3 through the digital bridge conversion module, wherein different times of amplification of the capacitance signal can be realized according to different resistance values of the resistor R413;
the temperature sensor and other resistors form a bridge type resistor circuit, a power supply is connected, then a second signal amplification module is connected for amplifying signals, and then a voltage follower is connected between the second signal amplification module and the signal processor 3, so that the measurement and analysis of the temperature at the bottom of the oil tank are finally formed;
the liquid level signal device is a switch signal, when the liquid level signal switch is switched on and switched off, power signals received by the signal processor 3 are different, and therefore the liquid level signal device can achieve the alarm effect when the liquid level reaches a certain limit.
Other parts of this embodiment are the same as any of embodiments 1-2 described above, and thus are not described again.
Example 4:
on the basis of any one of the above embodiments 1 to 3, in order to better implement the present invention, as shown in fig. 1 and 4, a magnet is further installed in the liquid level sensor 6, and the liquid level annunciator is a dry spring 10 capable of being attracted by the magnet; the dry spring 10 is fixedly mounted in the guide rod 4.
The working principle is as follows: the liquid level sensor 6 is lifted on the guide rod 4 along with the height of the liquid level, a magnet is arranged in the liquid level sensor 6, a dry spring 10 is arranged in the guide rod 4 and serves as a liquid level annunciator, when the liquid level sensor 6 reaches the position of the dry spring 10, the dry spring 10 is attracted by the magnet, so that the dry spring 10 is connected with an alarm circuit preset in the guide rod 4, and the alarm function is realized; it should be noted that the dry springs 10 are arranged according to different requirements, and may be arranged at a high position inside the guide rod 4 to give an alarm when the liquid level is too high, or at a low position inside the guide rod 4 to give an alarm when the liquid level is too low, and different sets of dry springs 10 may be arranged in the guide rod to give alarms at different liquid levels; and the dry spring 10 can transmit the change of the signal through the magnet attraction connection, and can also alarm through the change of the feedback signal through the magnet attraction disconnection circuit, which are all in the protection scope of the invention.
Other parts of this embodiment are the same as any of embodiments 1 to 3, and thus are not described again.
Example 5:
the present invention is made in view of any one of the above embodiments 1 to 4, and in order to better implement the present invention, the mounting case 2 is further formed by processing a monolithic aluminum alloy which is anodized and surface-painted.
The working principle is as follows: the operation can meet the requirements of the device on certain electromagnetic shielding, certain structural strength and corrosion resistance.
Other parts of this embodiment are the same as any of embodiments 1 to 4, and thus are not described again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (7)
1. A composite fuel sensor is characterized by comprising an oil tank shell (1), a mounting box (2), a guide rod (4), a temperature sensor (5), a liquid level sensor (6), an oil mass sensor (7) and an opening (11);
the top end opening of the oil tank shell (1) is hermetically connected with the bottom of the mounting box (2);
the guide rod (4) is arranged in the oil tank shell (1), the guide rod (4) is hollow, the top of the guide rod is fixed in the chassis of the mounting box (2), and the bottom of the guide rod is connected with the bottom of the space in the oil tank shell (1);
the temperature sensor (5) is arranged at the bottom end inside the guide rod (4);
the liquid level sensor (6) is movably arranged outside the guide rod (4);
the oil quantity sensor (7) is a capacitance type oil quantity sensor and comprises a capacitance type sensor anode (8) and a capacitance type sensor cathode (9); the positive electrode (8) and the negative electrode (9) of the capacitive sensor are wall-shaped structures which are consistent with the side wall of the oil tank shell (1) in shape; the top ends of the positive electrode (8) and the negative electrode (9) of the capacitive sensor are fixedly sealed in the mounting box (2), and the bottom ends of the positive electrode and the negative electrode are fixed on the bottom surface of the oil tank shell (1); a fixed interval is arranged between the positive electrode (8) of the capacitive sensor and the negative electrode (9) of the capacitive sensor; the openings (11) are formed in the top end and the bottom end of the positive electrode (8) and the negative electrode (9) of the capacitive sensor.
2. A composite fuel sensor as set forth in claim 1, characterized in that a signal processor (3) is provided in said mounting box (2); the signal processor (3) is connected with the temperature sensor (5) and the oil quantity sensor (7) through leads;
the lead of the temperature sensor (5) is connected into the mounting box (2) through a guide rod (4) and then is connected with the signal processor (3);
and a lead connected with the anode (8) of the capacitive oil mass sensor and the cathode (9) of the capacitive oil mass sensor is connected with the signal processor (3) by connecting from the mounting box (2).
3. The composite fuel sensor as claimed in claim 2, wherein the circuit connecting the fuel sensor (7) and the signal processor (3) comprises a signal excitation module, a resistor R412, a resistor R417, a resistor R411, a fuel sensor, a first signal amplification module, a digital bridge conversion module, and the signal processor (3);
the signal excitation module is connected with a resistor R412 and then is connected with an oil quantity sensor (7);
the oil mass sensor (7) is connected with the negative input end of the first signal amplification module after receiving a signal end and connecting a resistor R412 and an output signal end and connecting a resistor R417;
the output end of the first signal amplification module is connected with the resistor R411 and then is connected with the digital bridge conversion module;
the digital bridge conversion module is connected with the signal processor (3).
4. The composite fuel sensor according to claim 2, wherein the circuit connecting the temperature sensor (5) and the signal processor (3) comprises a bridge type resistance sensor module, a resistor R303, a resistor R305, a second signal amplification module, a resistor R326 and a voltage follower;
the bridge type resistance sensor module is a bridge type resistance circuit consisting of a temperature sensor (5), an adjustable resistor RP301, a resistor R301 and a resistor R308;
the negative output end of the bridge-type resistor circuit is connected with a resistor R305 and then is connected with the negative input end of the second signal amplification module, and the positive output end of the bridge-type resistor circuit is connected with a resistor R303 and then is connected with the positive input end of the second signal amplification module;
the output end of the second signal amplification module is connected with the resistor R326 and then is connected with the positive input end of the voltage follower;
the output end of the voltage follower is connected with the signal processor (3).
5. The composite fuel sensor of claim 2, further comprising a fluid level alarm circuit; the liquid level alarm circuit is positioned in the guide rod (4) and connected with the signal processor (3), and comprises a resistor R119, a resistor R118, an optical coupler D114, a resistor R117 and a liquid level annunciator;
the ANODE input end of the optocoupler D114 is connected with the resistor R119 and the resistor R118 which are connected in series, and then is connected with an input power supply;
the CATHODE negative input end of the optocoupler D114 and the EMITTOR emission collector terminal are grounded;
the COLLECTOR terminal of the optocoupler D114 is connected with the signal processor (3);
the liquid level annunciator is a switching signal and is connected with a node between the resistor R119 and the resistor R118 and a COLLECTOR terminal of a COLLECTOR of the optocoupler D115;
the resistor R117 is connected with a power supply and then connected into the signal processor (3).
6. The composite fuel sensor according to claim 5, wherein a magnet is installed in the liquid level sensor (6), and the liquid level annunciator is a dry spring (10) capable of being attracted by the magnet; the dry spring (10) is fixedly arranged in the guide rod (4).
7. A composite fuel sensor according to claim 1, characterised in that the mounting box (2) is machined from an anodised, painted surface monolithic aluminium alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911193791.3A CN110887544A (en) | 2019-11-28 | 2019-11-28 | Combined type fuel sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911193791.3A CN110887544A (en) | 2019-11-28 | 2019-11-28 | Combined type fuel sensor |
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| Publication Number | Publication Date |
|---|---|
| CN110887544A true CN110887544A (en) | 2020-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911193791.3A Pending CN110887544A (en) | 2019-11-28 | 2019-11-28 | Combined type fuel sensor |
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| CN (1) | CN110887544A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112504399A (en) * | 2020-11-20 | 2021-03-16 | 北奔重型汽车集团有限公司 | Liquid level transmitter for vehicle fuel oil theft prevention |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112504399A (en) * | 2020-11-20 | 2021-03-16 | 北奔重型汽车集团有限公司 | Liquid level transmitter for vehicle fuel oil theft prevention |
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