CN106323415A - Method for adjusting capacitance value of capacitive fuel quantity sensor - Google Patents
Method for adjusting capacitance value of capacitive fuel quantity sensor Download PDFInfo
- Publication number
- CN106323415A CN106323415A CN201610688720.0A CN201610688720A CN106323415A CN 106323415 A CN106323415 A CN 106323415A CN 201610688720 A CN201610688720 A CN 201610688720A CN 106323415 A CN106323415 A CN 106323415A
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- outer tube
- sensor
- adjusting
- capacitance value
- pipe
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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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention provides a method for adjusting a capacitance value of a capacitive fuel quantity sensor and aims to provide a method with high consistency and reliable stability for accurately adjusting the capacitance value of the sensor. The method is realized by the following technical scheme: according to the characteristic that the distance between polar plates is constant, adjusting the capacitance value by adjusting the areas of the polar plates; in an inner/outer tube coaxial capacitor consisting of two parallel metal plates separated by an insulating medium; firstly, forming a group of adjusting windows which are mutually symmetric in a part, close to the tail end, of an outer tube, and meanwhile, adding a compensating tube in the outer tube; secondly, enabling a press riveting screw to penetrate through an adjusting groove in the end, close to the sensor, of the outer tube, and rigidly connecting the compensating tube with the press riveting screw, wherein the outer tube and the compensating tube jointly form an electrode of the sensor; enabling the press riveting screw to slide in the adjusting groove of the outer tube; adjusting the capacitance value by adjusting superposed area of the outer tube and the compensating tube through the press riveting screw; after the capacitance value is adjusted to be in place, the compensating tube is fixed by using a nut.
Description
Technical field
Type of the present invention relates to one and may be installed various occasion and carry out the various oil levels such as gasoline, diesel oil, hydraulic oil accurately
Measurement, be also applied for various non-electrically conductive liquid measure Capacitor-type Fuel Quantity Sensor, especially survey aircraft fuel oil storage dress
Put the Capacitor-type Fuel Quantity Sensor of intermediate fuel oil liquid level.
Background technology
Capacitor-type Fuel Quantity Sensor is because of its simple in construction, mechanical motion structure, and measuring principle is reliable, durable,
The fuel tank environment of rather harsh presents good compatibility and long-life, obtains extensively in World Airways oil measurement field
Application.But the accuracy of this sensor is affected relatively big by connection arrangement of conductors electric capacity and temperature, thus constrains condenser type
The raising of fuel level gauge certainty of measurement.
The transducing part of capacitance type oil level sensor is a coaxial container, by being arranged on the metal electricity of fuel tank internal
Hold test pole, it is possible to accurately measure the trapped fuel amount in fuel tank.When oil enter cause after container sensor housing and induction electrode it
Between the change of capacitance, this variable quantity is by the conversion of circuit and carries out accurate linear and temperature-compensating, output simulation letter
Number or data communication supply display instrument or miscellaneous equipment.Use in linear capacitance sensor measurement complicated shape fuel tank on aircraft
Oil mass, owing to there is the measurement error that electric capacity non-ideal causes in capacitance sensor, the attitude produced when measuring fuel oil is by mistake
Difference, test result often produces the temperature error of considerable influence.Owing to Capacitor-type Fuel Quantity Sensor is by connecting arrangement of conductors electric capacity
Impact and hardware compensating temperature error precision are the highest, have to use and add the method for draining the oil the most repeatedly after capacitive fuel gage installation
Adjust.
Capacitance type oil level sensor is aimed at accurately measuring and making to measure, by being arranged on fuel tank internal of oil level
Metal capacitance test pole, the level height change of minimum 1mm can be measured.Capacitance type sensor measures system at aircraft fuel oil
In, the change of fuel level position may result in capacitance and produces change.By circuit, the change of capacitance is converted into the signal of telecommunication,
I.e. realize the measurement to the change of aircraft fuel oil oil mass.Capacitance type oil level sensor is to utilize to be filled with liquid medium shape between positive and negative rapier
The electric capacity become linearly changes, by defeated for the signal of telecommunication that the variable quantity (i.e. the variable quantity of liquid level) of electric capacity is converted into standard along with liquid level
Go out.On the other hand, irregularly shaped due to fuel tank, special-shaped fuel tank determines the change of the height change of fuel oil and volume thereof not
Linear, use analog circuit marked ratio to be relatively difficult to, so existing measuring method generally has bigger error.
Owing to capacitance type sensor self capacity amount is the least, only tens pico farads, the most a few pico farad, therefore sensor is disturbed by parasitic capacitance
Problem the most prominent.Inner tube, outer tube that typical Capacitor-type Fuel Quantity Sensor structure is generally made by metal material are constituted, electricity
Appearance formula fuel-quantity transducer inner and outer tubes are relatively fixed, i.e. the distance of pole plate immobilizes, sensor production complete after pole plate
Area the most no longer changes, and measures level height by becoming the dielectric constant of medium.But because of by material, processing method, assembling
Deng the impact of many factors, the capacitance of different sensors is difficult to keep higher concordance, and this gives the line of aircraft oil measurement
Property degree index, machine on zero, the work such as full position calibration make troubles,
Summary of the invention
It is an object of the invention to the weak point existed for above-mentioned prior art, it is provided that a kind of concordance is high, has height
Precision, high stability, the method that can accurately adjust sensor capacitance value, to meet the electric capacity of the required precision of aircraft oil measurement
Formula fuel-quantity transducer method for regulating capacitance value.
The technical solution adopted for the present invention to solve the technical problems is: a kind of Capacitor-type Fuel Quantity Sensor capacitance adjusts
Method, has following technical characteristic: according to polar plate spacing from changeless characteristic, uses the area adjusting pole plate to adjust electricity
Capacitance, in the inside/outside pipe ganged condenser being made up of separate two parallel metal sheets of dielectric, first leans at outer tube 2
Opening one group of symmetrical regulation window 12 at proximal end, increase by a compensation pipe 10 simultaneously in outer tube 2, then, will press spiral shell
Nail 7, rivets by compensating pipe installing hole through described outer tube by the regulating tank 11 on sensor terminal, by compensations pipe 10 with press
Screw 7 is rigidly connected, and outer tube 2 and compensation pipe 10 collectively form an electrode of sensor, and make self-clinching stud 7 outside
Slide in pipe 2 regulating tank 11, adjust outer tube by self-clinching stud and compensate pipe overlapping area, i.e. adjusting sensor plate area and come
Adjust capacitance, to be adjusted put in place after, with nut 8 fixed compensation pipe.
The present invention has the advantages that compared to prior art
Concordance is high.The present invention, in the inside/outside pipe ganged condenser of dielectric separate two parallel metal sheets composition, depends on
According to polar plate spacing from the characteristic that immobilizes, take to adjust the area of pole plate, adjust capacitance, by increasing a tune on outer tube
Joint window and a compensation pipe, by screw Hard link, it is achieved the fine setting of sensor capacitance value, greatly improve condenser type and pass
The concordance of sensor.
There is high accuracy, high stability,.The present invention opens one group of symmetrical regulation window on outer tube, and increases by a compensation
Pipe, compensates pipe and fills within the outer tube, and self-clinching stud passes outer tube regulating tank, is riveted on compensation pipe installing hole, self-clinching stud and benefit
Repaying pipe Hard link together, self-clinching stud slides in outer tube regulating tank, and outer tube and compensation pipe collectively form of sensor
Electrode, by adjusting outer tube and compensating pipe overlapping area, i.e. adjusts sensor plate area and adjusts capacitance, through accurate
Temperature-compensating and linear correction, have high accuracy, high stability and test constantly advantage.
Accompanying drawing explanation
Fig. 1 is the organigram of Capacitor-type Fuel Quantity Sensor of the present invention.
Fig. 2 is the organigram of Fig. 1 Capacitor-type Fuel Quantity Sensor capacitance adjustment member.
In figure: 1. inner tube, 2. outer tube, 3. connection box set component, 4. end cap molectron, 5. fixing hoop, 6. movable dog,
7. self-clinching stud, 8. nut, 9. pad, 10. compensate pipe, 11. regulating tanks, 12. regulation windows.
Further illustrate the present invention below in conjunction with the accompanying drawings with example, but the most therefore limit the present invention to described enforcement
Among example scope.
Detailed description of the invention
Refering to Fig. 1, Fig. 2.The mounting means of sensor is built-in type, uses screw by fixing hoop 5 and movable dog (6)
Being arranged in fuel storage device, movable dog 6 can be movable within the specific limits, and make sensor is provided with certain fault-tolerant energy
Power.Sensor wire case assembly 3 is fixed on outer tube 2, and the inner tube 1 of sensing part, outer tube 2 are solid by metal pivot pin and liner
Fixed.Outer tube 2 and inner tube 1 constitute the two poles of the earth of sensor, are respectively designated as outer tube pole and inner tube pole.
The present invention from changeless characteristic, uses the area adjusting pole plate to adjust capacitance according to polar plate spacing,
In the inside/outside pipe ganged condenser being made up of separate two parallel metal sheets of dielectric, first at outer tube 2 near end
Open one group of symmetrical regulation window 12, in outer tube 2, increase by a compensation pipe 10, then, by self-clinching stud 7 through institute simultaneously
State outer tube and lean on the regulating tank 11 on sensor terminal, rivet, by compensation pipe 10 and self-clinching stud 7 rigidity by compensating pipe installing hole
Linking together, outer tube 2 and compensation pipe 10 collectively form an electrode of sensor, and make self-clinching stud 7 at outer tube 2 regulating tank
Slide in 11, adjust outer tube by self-clinching stud and compensate pipe overlapping area, i.e. adjusting sensor plate area and adjust electric capacity
Value, to be adjusted put in place after, with nut 8, pad 9 fixed compensation pipe.
Claims (4)
1. a Capacitor-type Fuel Quantity Sensor method for regulating capacitance value, has following technical characteristic: according to polar plate spacing from fixing
Constant characteristic, uses the area adjusting pole plate to adjust capacitance, by separate two the parallel metal sheet groups of dielectric
In the inside/outside pipe ganged condenser become, first open one group of symmetrical regulation window (12) at outer tube (2) near end,
In outer tube (2), increase by compensation pipe (10), then, by self-clinching stud (7) through described outer tube by sensor terminal simultaneously
Regulating tank (11), rivet by compensating pipe installing hole, (10) and self-clinching stud (7) managed in compensations and is rigidly connected, outward
Pipe (2) and compensation pipe (10) collectively form an electrode of sensor, and make self-clinching stud (7) at outer tube (2) regulating tank (11)
Interior slip, adjusts outer tube by self-clinching stud and compensates pipe overlapping area, i.e. adjusting sensor plate area and adjust capacitance,
To be adjusted put in place after, with nut (8) fixed compensation pipe.
2. Capacitor-type Fuel Quantity Sensor method for regulating capacitance value as claimed in claim 1, it is characterised in that: the installation of sensor
Mode is built-in type, uses screw fixing hoop (5) and movable dog (6) to be arranged in fuel storage device, movable dog
(6) can be movable within the specific limits, make sensor is provided with certain fault-tolerant ability.
3. Capacitor-type Fuel Quantity Sensor method for regulating capacitance value as claimed in claim 1, it is characterised in that: sensor wire box
Assembly (3) is fixed on outer tube (2), and the inner tube (1) of sensing part, outer tube (2) are fixed by metal pivot pin and liner.
4. Capacitor-type Fuel Quantity Sensor method for regulating capacitance value as claimed in claim 1, it is characterised in that: outer tube (2) and interior
Pipe (1) constitutes the two poles of the earth of sensor, is respectively designated as outer tube pole and inner tube pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610688720.0A CN106323415B (en) | 2016-08-18 | 2016-08-18 | Capacitance value adjusting method for capacitive oil quantity sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610688720.0A CN106323415B (en) | 2016-08-18 | 2016-08-18 | Capacitance value adjusting method for capacitive oil quantity sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106323415A true CN106323415A (en) | 2017-01-11 |
| CN106323415B CN106323415B (en) | 2023-05-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610688720.0A Active CN106323415B (en) | 2016-08-18 | 2016-08-18 | Capacitance value adjusting method for capacitive oil quantity sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108204846A (en) * | 2017-12-13 | 2018-06-26 | 中国航空工业集团公司成都飞机设计研究所 | Aircraft fuel quantity meas urement system calibration-free design method |
| CN112543525A (en) * | 2020-12-14 | 2021-03-23 | 湖南顶立科技有限公司 | Self-adaptive frequency modulation method and system for medium-frequency induction heating furnace |
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| DE3923079A1 (en) * | 1989-07-13 | 1991-01-24 | Fresenius Ag | Measuring level of electrically conducting liquid - has measuring of infusion liquid or blood from change in capacitance of electrodes in measurement liquid |
| DE10250523A1 (en) * | 2001-10-31 | 2003-07-24 | Ifm Electronic Gmbh | Method for measuring the capacity or capacity change of a capacitive circuit or component, especially for use with a liquid level measurement instrument, whereby measurement windows are set to compensate deposition effects |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112543525A (en) * | 2020-12-14 | 2021-03-23 | 湖南顶立科技有限公司 | Self-adaptive frequency modulation method and system for medium-frequency induction heating furnace |
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| Publication number | Publication date |
|---|---|
| CN106323415B (en) | 2023-05-09 |
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