KR101796921B1 - Compressed natural gas instrument use ultrasonic wave attenuation - Google Patents

Compressed natural gas instrument use ultrasonic wave attenuation Download PDF

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Publication number
KR101796921B1
KR101796921B1 KR1020160004505A KR20160004505A KR101796921B1 KR 101796921 B1 KR101796921 B1 KR 101796921B1 KR 1020160004505 A KR1020160004505 A KR 1020160004505A KR 20160004505 A KR20160004505 A KR 20160004505A KR 101796921 B1 KR101796921 B1 KR 101796921B1
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KR
South Korea
Prior art keywords
cng
ultrasonic
tank
signal
fuel
Prior art date
Application number
KR1020160004505A
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Korean (ko)
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KR20170085205A (en
Inventor
최두석
임석연
김권세
Original Assignee
공주대학교 산학협력단
동명대학교산학협력단
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Application filed by 공주대학교 산학협력단, 동명대학교산학협력단 filed Critical 공주대학교 산학협력단
Priority to KR1020160004505A priority Critical patent/KR101796921B1/en
Priority to PCT/KR2017/000475 priority patent/WO2017123049A1/en
Publication of KR20170085205A publication Critical patent/KR20170085205A/en
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Publication of KR101796921B1 publication Critical patent/KR101796921B1/en

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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
    • G01F23/28—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 the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/03006—Gas tanks
    • 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
    • G01F23/14—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 measurement of pressure
    • G01F23/16—Indicating, recording, or alarm devices being actuated by mechanical or fluid means, e.g. using gas, mercury, or a diaphragm as transmitting element, or by a column of liquid
    • G01F23/165—Indicating, recording, or alarm devices being actuated by mechanical or fluid means, e.g. using gas, mercury, or a diaphragm as transmitting element, or by a column of liquid of bubbler type
    • G01F23/167—Indicating, recording, or alarm devices being actuated by mechanical or fluid means, e.g. using gas, mercury, or a diaphragm as transmitting element, or by a column of liquid of bubbler type with mechanic or fluid indicating or recording
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S367/00—Communications, electrical: acoustic wave systems and devices
    • Y10S367/908—Material level detection, e.g. liquid level

Abstract

The present invention relates to a CNG fuel level meter using an ultrasonic attenuation signal, and more particularly, to a CNG fuel level meter using an ultrasonic attenuation signal, To a CNG fuel level meter using an attenuation signal.

Description

[0001] The present invention relates to a CNG fuel level meter using an ultrasonic attenuation signal,

The present invention relates to a CNG (Compressed Natural Gas) fuel level meter using an attenuation signal, which measures the degree of attenuation of an ultrasonic wave attenuated by passing an CNG fuel through the emission of ultrasonic waves, To a CNG fuel level meter using an ultrasonic attenuation signal.

Conventionally, a plurality of laser sensors or ultrasonic sensors are mounted on the upper end of a fuel tank for fuel measurement of an automobile, and the distance to the surface of the fuel is detected as an average value. Thereafter, the remaining amount of fuel, Etc. have been widely used.

1, a conventional fuel measuring apparatus includes a fuel tank in which fuel is stored and has a predetermined space therein, a plurality of fuel tanks in the ceiling of the fuel tank for precisely detecting the remaining amount of fuel remaining in the fuel tank A sensor unit for measuring the distance to the surface of the fuel; an average value calculation unit for calculating a mean value by receiving the signal detected by the sensor unit, and comparing the average value with the volume of the fuel tank built in, And a display unit for receiving the output signal of the control unit and displaying a remaining amount of fuel, a distance traveled by the vehicle, and an average fuel consumption rate, etc. .

However, since the conventional fuel measuring apparatus measures the amount of fuel remaining in the fuel tank by using the distance value from the top of the fuel tank to the surface of the liquefied fuel, the amount of the fuel, which is the liquefied fuel, Gas), it is difficult to measure the residual amount of CNG (compressed natural gas) provided in a gaseous state.

In order to solve this disadvantage, the pressure measuring device 2 is attached to the outlet of the fuel tank 1 as shown in FIG. 2, and the pressure of the compressed natural gas discharged is measured, It is difficult to measure the amount of compressed natural gas remaining in the fuel tank 1 because the compressed natural gas is a pure gas and the volume of the natural gas varies greatly according to the temperature .

Accordingly, there is a need for a fuel measuring device capable of accurately measuring the amount of compressed natural gas provided in the fuel tank.

Korean Patent Publication No. 2005-0038461

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a method and an apparatus for reducing the amount of compressed natural gas remaining in a gas tank by using the principle that the ultrasonic waves collide with particles of compressed natural gas existing in a gaseous state, And a CNG fuel level meter using an ultrasonic attenuation signal capable of measuring an accurate amount.

In order to achieve the above object, the CNG fuel level meter using the ultrasonic attenuation signal according to the present invention includes an ultrasonic transmission sensor 110 attached to one side of a CNG tank of a vehicle and emitting ultrasonic waves, An ultrasonic transmission / reception unit (100) including an ultrasonic reception sensor (120) disposed opposite to the transmission sensor (110) and receiving the ultrasonic signal emitted from the ultrasonic transmission sensor (110); A signal measuring unit 200 for measuring the CNG remaining amount in the CNG tank using the ultrasonic signal measured by the ultrasonic transmitting / receiving unit 100; And a control unit.

In addition, the signal measuring unit 200 uses attenuation of ultrasonic waves.

Further, the CNG fuel level meter using the ultrasonic attenuation signal may further include a pressure sensor 300 for measuring the internal pressure of the CNG tank, and the pressure sensor 300 may be interlocked with the signal measuring unit 200 , And the temperature of CNG is calculated.

The CNG fuel level meter using the ultrasonic attenuation signal may further include a temperature controller 400 for controlling the temperature of CNG and the temperature controller 400 may operate in conjunction with the signal measuring unit 200 do.
The ultrasonic transmission sensor 110 is attached to one side of the CNG tank of the vehicle and emits ultrasonic waves. The ultrasonic transmission sensor 110 is disposed opposite to the ultrasonic transmission sensor 110 on the other side of the CNG tank of the vehicle. An ultrasonic transmission / reception unit (100) including an ultrasonic reception sensor (120) for receiving ultrasonic signals; A signal measuring unit 200 for measuring the amount of CNG remaining in the CNG tank using the ultrasonic signal measured by the ultrasonic transmitting / receiving unit 100; A pressure sensor (300) for measuring the internal pressure of the CNG tank; And a temperature control unit 400 for controlling the CNG temperature. The signal measuring unit 200 measures the remaining amount of CNG using the attenuation of ultrasonic waves, and the pressure sensor 300 measures the amount of CNG remaining in the signal measuring unit 200, And the temperature controller (400) controls the temperature of the CNG in conjunction with the signal measuring unit (200). The CNG fuel level meter using the ultrasonic attenuation signal.

The CNG fuel level meter using the ultrasonic attenuation signal according to the present invention having the above-described structure utilizes the characteristic that the ultrasonic waves are collided with compressed natural gas (CNG) particles in a gaseous state to be attenuated so that the density of the compressed natural gas changes It is possible to measure the exact remaining amount of compressed natural gas.

Also, by comparing the measured pressure of the CNG fuel tank with the amount of CNG remaining in the CNG fuel tank to measure the temperature of the CNG and maintaining the temperature of the CNG at an appropriate temperature, safety is improved.

1 is a perspective view showing a conventional fuel measuring device.
2 is a perspective view showing a conventional fuel measurement device.
3 is a perspective view illustrating a CNG fuel level meter using an ultrasonic attenuation signal according to the present invention.
4 is a perspective view of a CNG fuel level meter using an ultrasonic attenuation signal according to the present invention.
5 is a conceptual diagram showing experimental data values of a CNG fuel level meter using an ultrasonic attenuation signal of the present invention.

Natural gas (NG) is a fossil fuel mainly composed of methane (methane). Compared to compressed natural gas (CNG), liquefied natural gas (LNG) and adsorbed natural gas (CNG) compressed natural gas at a high pressure of 200 ~ 250kg / cm 2 , and LNG is made by cooling the natural gas to -161.5 ° C or lower to be in a liquid state, ANG is a natural gas compressed to 30 to 60 kg / cm 2 on an adsorbent such as activated carbon.

LNG requires expensive cooling or cryogenic tanks (insulation), but CNG does not require such equipment and can save money. On the other hand, CNG has a volume three times as high as LNG and has to use a high-pressure fuel tank, so there is a risk of explosion when the storage container (fuel tank) ruptures, but CNG itself is safe against fire risk due to high auto ignition temperature. Natural gas such as CNG and LNG has almost no emissions of sulfur oxides and nitrogen oxides, which are the main pollutants of air pollution, and the amount of carbon dioxide emissions is less than gasoline (gasoline), light oil and LPG (liquefied petroleum gas) .

Natural gas powered natural gas vehicles were first built in the 1930s and have become a means of energy conservation since the 1970s and have become a means of preventing air pollution since the early 1990s. Natural gas buses, which have been in service in Korea since 2000, are also called CNG buses because they use CNG as a fuel, and a large number of cities in the world are expanding CNG buses.

In recent years, there has been a need for a device that can accurately measure the amount of CNG, and a CNG fuel level meter using the ultrasonic attenuation signal of the present invention will be described below with reference to the drawings. .

3, the CNG fuel level meter using the ultrasonic attenuation signal according to the present invention includes an ultrasonic transmission sensor 110 attached to one side of a CNG tank 10 of a vehicle to emit ultrasonic waves to the other side, And an ultrasonic reception sensor 120 disposed opposite to the ultrasonic transmission sensor 110 on the other side of the ultrasonic sensor 10 for receiving ultrasonic signals emitted from the ultrasonic transmission sensor 110. The ultrasonic transmission / And a signal measuring unit 200 for measuring the amount of CNG remaining in the CNG tank using the ultrasonic signal measured by the ultrasonic transmitting and receiving unit 100. The signal measuring unit 200 measures the attenuation of ultrasonic waves .

In detail, ultrasound destroys sound waves having high frequencies that can not be heard by human ears, and ultrasound waves are usually referred to as sound waves of 20,000 Hz or more. Such high frequency ultrasonic waves are hardly transmitted in the air and are easily transmitted in liquid or solid. Such ultrasonic waves have properties such as linearity, transmission, refraction, reflection, scattering, attenuation, resolution, focusing, propagation, etc. At this time, in the present invention, the characteristics of weakening by attenuation (absorption, scattering, diffusion appearing by propagation of ultrasonic waves) .

4, the ultrasonic waves emitted from the ultrasonic transmission sensor 110 are transmitted to the ultrasonic reception sensor 120 through the CNG (11) gas particles existing in the gaseous state inside the CNG tank 10 And the signal is attenuated due to absorption, scattering, diffusion, etc., and the amount of attenuation of the ultrasonic signal is proportional to the number and amount of CNG (11) gas particles. That is, when the number of particles of the CNG 11 located in the CNG tank 10 is large, the attenuation becomes large, and when the number of particles of the CNG 11 is small, the attenuation becomes small.

Accordingly, since the ultrasonic signal changes according to the number of particles of the CNG 11, the temperature of the CNG is changed by the peripheral system (external, CNG tank), and the CNG 11, which is located inside the CNG tank 10, It is possible to measure the remaining amount of CNG accurately.

In addition, the signal measuring unit 200 may display the amount of the CNG 11 located inside the CNG tank 10 by the level (the total amount is divided by a constant value) using the measured ultrasonic signal.

Referring to FIG. 5, since the ultrasonic wave has a voltage value depending on the degree of attenuation, the voltage value corresponding to the attenuation value of the ultrasonic signal measured by the signal measuring unit 200 is converted to a CNG signal 11 ) So that the driver operating the vehicle can check the amount of the remaining CNG 11.

5, as the amount of particles of the CNG 11 located in the CNG tank 11 increases, the voltage value measured by the signal measuring unit 200 increases, and when the CNG tank 11 is located within the CNG tank 10 Although the voltage measured by the signal measuring unit 200 is reduced as the amount of the CNG 11 is decreased, it may be variously changed according to an algorithm or a display method. It is sufficient if the voltage value is changed in accordance with the amount. The CNG fuel level meter using the ultrasonic attenuation signal of the present invention can measure the remaining amount of CNG by measuring the area (area) of the voltage appearing in the signal layer 200.

The CNG fuel level meter using the ultrasonic attenuation signal according to the present invention further includes a pressure sensor 300 for measuring the internal pressure of the CNG tank 10. The pressure sensor 300 measures the internal pressure of the CNG tank 10, Can be used to calculate the temperature of the CNG (11).

4, since the CNG 11 is a compressed gas, the pressure of the CNG 11 varies in response to a temperature change of the season and the surrounding system, so that the CNG 11 becomes bulky and the CNG tank 10 is damaged The CNG tank 10 is generally made of a material having a high thickness and a high rigidity. However, the CNG tank 10 can not withstand the pressure of the CNG 11, Accidents can also occur.

Therefore, in the present invention, the pressure sensor 300 is provided in the discharge part 12 of the CNG tank 10 and then interlocked with the signal measuring part 200, so that the signal measuring part 200 can detect the ultrasonic transmitting / The temperature change of the CNG 11 is measured based on the total amount of the CNG 11 obtained by using the ultrasonic signals measured by the pressure sensor 300 and the pressure data of the CNG 11 obtained by the pressure sensor 300, It is possible.

The pressure sensor 300 may also be configured to measure the remaining amount of the CNG 11 measured by the ultrasonic transmitting and receiving unit 100 and the signal measuring unit 200 in accordance with different methods Attenuation, and pressure).

In addition, the CNG fuel level meter using the ultrasonic attenuation signal of the present invention may further include a temperature controller 400 for controlling the temperature of CNG, and the temperature controller 400 may be interlocked with the signal measuring unit 200.

The CNG tank 10 is provided with the temperature control unit 400 and the signal measuring unit 200 measures the temperature of the CNG tank 10 based on the data obtained from the ultrasonic transmitting and receiving unit 100 and the pressure sensor 300. [ It is possible to prevent a safety accident by controlling the temperature of the CNG tank 10 or the CNG 11 when an abnormality occurs in the temperature of the CNG tank 11 and to control the temperature of the CNG 11 flowing into the engine to an effective temperature for combustion .

4 shows a method of cooling the CNG tank 10 by cooling water flowing into the CNG tank 10 when the temperature control unit 400 senses a danger in the signal measuring unit 200. However, Various other temperature control methods are possible.

The technical idea should not be interpreted as being limited to the above-described embodiment of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, such modifications and changes are within the scope of protection of the present invention as long as it is obvious to those skilled in the art.

10: CNG tank 11: CNG
100: ultrasonic transmitter 110: ultrasonic transmitter
120: Ultrasonic receiving sensor
200: Signal measurement unit
300: Pressure sensor
400: temperature control unit

Claims (4)

An ultrasonic transmission sensor 110 attached to one side of the CNG tank of the vehicle and emitting ultrasonic waves; a plurality of ultrasonic transducers 110 disposed opposite to the ultrasonic transmission sensor 110 on the other side of the CNG tank of the vehicle, (100) comprising an ultrasonic receiving sensor (120) for receiving ultrasonic waves;
A signal measuring unit 200 for measuring the amount of CNG remaining in the CNG tank using the ultrasonic signal measured by the ultrasonic transmitting / receiving unit 100;
A pressure sensor (300) for measuring the internal pressure of the CNG tank; And
And a temperature control unit (400) for controlling the CNG temperature,
The signal measuring unit 200 measures the remaining amount of CNG using the attenuation of ultrasonic waves,
The pressure sensor 300 calculates the temperature of the CNG in conjunction with the signal measuring unit 200,
Wherein the temperature controller (400) controls the temperature of the CNG in conjunction with the signal measuring unit (200).



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KR1020160004505A 2016-01-14 2016-01-14 Compressed natural gas instrument use ultrasonic wave attenuation KR101796921B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020160004505A KR101796921B1 (en) 2016-01-14 2016-01-14 Compressed natural gas instrument use ultrasonic wave attenuation
PCT/KR2017/000475 WO2017123049A1 (en) 2016-01-14 2017-01-13 Ultrasonic cng fuel level measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020160004505A KR101796921B1 (en) 2016-01-14 2016-01-14 Compressed natural gas instrument use ultrasonic wave attenuation

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KR20170085205A KR20170085205A (en) 2017-07-24
KR101796921B1 true KR101796921B1 (en) 2017-12-12

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