KR20020058784A - Changing capacity of volume measuring apparatus - Google Patents

Changing capacity of volume measuring apparatus Download PDF

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Publication number
KR20020058784A
KR20020058784A KR1020000086914A KR20000086914A KR20020058784A KR 20020058784 A KR20020058784 A KR 20020058784A KR 1020000086914 A KR1020000086914 A KR 1020000086914A KR 20000086914 A KR20000086914 A KR 20000086914A KR 20020058784 A KR20020058784 A KR 20020058784A
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South Korea
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white noise
noise signal
solution
volume
container
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KR1020000086914A
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Korean (ko)
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김건석
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이계안
현대자동차주식회사
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Priority to KR1020000086914A priority Critical patent/KR20020058784A/en
Publication of KR20020058784A publication Critical patent/KR20020058784A/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
    • G01F23/296—Acoustic waves
    • 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
    • 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
    • B60K2015/0321—Fuel tanks characterised by special sensors, the mounting thereof
    • B60K2015/03217—Fuel level sensors

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Acoustics & Sound (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

PURPOSE: A device for measuring changing amount of volume is provided to accurately measure remaining amount of fluid and to linearly display actual fluctuation of the fluid. CONSTITUTION: A device includes a vessel(9) storing fluid to act as a Helmholtz resonator; a transmitter(11) installed on one side of the vessel to transmit white noise to a space in the vessel and including a white noise generator(15) generating white noise and a loud speaker(17) regenerating all components of the white noise; and a receiver(13) measuring white noise signal generated by the transmitter and transmitted through the space in the vessel by a transmission function for measuring remaining amount of fluid in the vessel.

Description

체적 변화량 측정장치{CHANGING CAPACITY OF VOLUME MEASURING APPARATUS}Volume change measuring device {CHANGING CAPACITY OF VOLUME MEASURING APPARATUS}

본 발명은 체적 변화량 측정장치에 관한 것으로서, 보다 상세하게는 일정한 체적을 가지는 용기 내에 담겨 있는 용액의 부피를 햄 홀쯔(Helmholtz) 공진 현상을 이용하여 측정하는 체적 변화량 측정장치에 관한 것이다.The present invention relates to a volume change measuring device, and more particularly, to a volume change measuring device for measuring the volume of a solution contained in a container having a constant volume using a Helmholtz resonance phenomenon.

일반적으로 일정한 체적을 가지는 용기에 용액을 담아서 사용하는 경우에는 용기 내에 어느 정도의 용액이 잔존하는지를 알려주는 용액 잔량 측정장치가 필요하다.In general, when a solution is used in a container having a constant volume, a solution remaining amount measuring device for indicating how much solution remains in the container is required.

이러한 용액 잔량 측정장치의 한 예로서 차량의 연료 게이지를 들 수 있다. 이 연료 게이지는 연료탱크 내의 연료 잔량을 측정할 수 있도록 구성된다.An example of such a solution remaining amount measuring device is a fuel gauge of a vehicle. This fuel gauge is configured to measure the fuel level in the fuel tank.

즉, 연료 게이지는 도 1에 도시된 바와 같이, 연료탱크(1)내에 설치되는 무게(3)가 변화하는 연료 레벨(5)에 따라 작동하고, 이 때 변화하는 저항을 측정하는 저항 테스터(7)를 이용하도록 구성된다.That is, as shown in FIG. 1, the fuel gauge operates according to the fuel level 5 at which the weight 3 installed in the fuel tank 1 changes, and at this time, the resistance tester 7 measuring the resistance which changes. Is configured to use

그러나 상기와 같은 연료 게이지는 연료탱크가 장착된 차량의 기울기에 따른 연료 레벨 변화로 잔존 연료량에 상당한 오차를 발생시켜 운전자를 불안하게 하며,However, such a fuel gauge causes a significant error in the remaining fuel amount due to the change of the fuel level according to the inclination of the vehicle equipped with the fuel tank, which makes the driver uneasy.

연료탱크의 형상이 복잡한 경우 게이지에 나타나는 값이 실제 연료의 변화량과 선형적으로 일치하지 않으므로 정확한 연비 계산을 불가능하게 하는 단점이 있다.If the shape of the fuel tank is complex, the value displayed on the gauge does not linearly match the actual fuel change, which makes it impossible to accurately calculate fuel economy.

따라서 본 발명은 상기와 같은 단점을 해소하기 위하여 발명된 것으로서, 본 발명의 목적은 용기 내에서 용액의 레벨 변화에도 불구하고 용액의 잔량을 정확하게 측정하고, 실제 용액 변화량을 선형적으로 나타내는 체적 변화량 측정장치를 제공한다.Therefore, the present invention was invented to solve the above disadvantages, and an object of the present invention is to accurately measure the residual amount of solution despite the level change of the solution in the container, and to measure the volume change that linearly represents the actual solution change amount. Provide the device.

도 1은 종래기술에 따른 연료탱크 내의 유량 측정장치의 구성도이다.1 is a block diagram of a flow rate measuring device in a fuel tank according to the prior art.

도 2는 본 발명에 따른 연료탱크 내의 체적 변화량 측정장치의 구성도이다.2 is a block diagram of an apparatus for measuring volume change in a fuel tank according to the present invention.

도 3은 본 발명에 따른 연료탱크 내의 체적 변화량 측정장치의 작동 원리를 설명한 흐름도이다.Figure 3 is a flow chart illustrating the operating principle of the volume change measurement device in the fuel tank according to the present invention.

이를 실현하기 위하여 본 발명에 따른 체적 변화량 측정장치는,In order to realize this, the volume change measuring device according to the present invention,

a)햄 홀쯔 공진기(Helmholtz Resonator) 역할을 하도록 용액을 담는 밀폐된 공간의 일정 체적을 형성하는 용기,a) a container that forms a volume in a closed space containing a solution to serve as a Helmholtz Resonator,

b)상기 용기의 공간에 백색 소음 신호를 전달할 수 있도록 상기 용기의 상 단에 설치되어 백색 소음 신호를 발생시키는 트랜스미터,b) a transmitter installed at the top of the container to transmit a white noise signal to the space of the container, to generate a white noise signal,

c)상기 트랜스미터에서 발생된 상기 백색 소음 신호가 전달함수에 의하여 상 기 용기의 공간을 통하여 전달되는 소음 신호를 측정하여 상기 용기 내의 용액 잔량을 측정하는 리시버,c) a receiver for measuring the residual amount of solution in the vessel by measuring the noise signal transmitted through the space of the vessel by the transfer function of the white noise signal generated by the transmitter,

를 포함하여 구성된다.It is configured to include.

이하, 본 발명의 바람직한 실시예를 첨부한 도면에 의하여 보다 상세히 설명한다.Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in more detail.

도 2는 본 발명에 따른 연료탱크 내의 체적 변화량 측정장치의 구성도로서, 용기(9), 트랜스미터(11), 그리고 리시버(13)를 포함한다.2 is a block diagram of a volume change measurement device in a fuel tank according to the present invention, which includes a container 9, a transmitter 11, and a receiver 13.

용기(9)는 도 2에 도시된 바와 같은 햄 홀쯔 공진기(Helmholtz Resonator) 역할을 하도록 구성된다. 이 용기(9)는 용액을 담는 밀폐된 공간, 즉 일정한 체적을 형성하다.The vessel 9 is configured to serve as a Hamholtz Resonator as shown in FIG. 2. This container 9 forms a closed space, ie a constant volume, containing the solution.

트랜스미터(11)는 백색 소음 신호를 발생시키도록 구성된다. 또 트랜스미터(11)는 용액이 차지하지 않는 용기(9)의 공간에 백색 소음 신호를 전달할 수 있도록 용기(9)의 일측에 설치된다. 보다 효과적으로 백색 소음 신호를 전달하기 위하여 용기(9)의 상측에 설치됨이 바람직하다.The transmitter 11 is configured to generate a white noise signal. In addition, the transmitter 11 is installed on one side of the container 9 so as to transmit a white noise signal to the space of the container 9 which is not occupied by the solution. In order to more effectively transmit the white noise signal, it is preferable to be installed above the container 9.

이러한 트랜스미터(11)는 도 3에 도시된 바와 같이, 백색 소음 발생기(15)와 라우드 스피커(17)를 포함한다. 백색 소음 발생기(15)는 용기(9)를 향하여 백색 소음 신호를 발생시키도록 구성된다. 라우드 스피커(17)는 백색 소음 발생기(15)에서 발생된 백색 소음 신호의 모든 성분을 재생시키도록 구성된다.This transmitter 11 includes a white noise generator 15 and a loudspeaker 17, as shown in FIG. The white noise generator 15 is configured to generate a white noise signal towards the container 9. The loudspeaker 17 is configured to reproduce all components of the white noise signal generated by the white noise generator 15.

그리고 리시버(13)는 트랜스미터(11)에서 발생된 백색 소음 신호가 용기(9)의 용액이 없는 공간을 통하여 전달되는 소음 신호를 측정하도록 구성된다. 또 리시버(13)는 전달함수에 의하여 용기(9) 내의 용액 잔량을 측정하도록 상기 트랜스미터(11)의 대향측에 설치된다. 이러한 리시버(13)는 다양하게 구성될 수 있으나 도 3에서는 마이크로폰으로 구성된 것을 예시한다.And the receiver 13 is configured to measure the noise signal from the white noise signal generated from the transmitter 11 is transmitted through the space without the solution of the container (9). The receiver 13 is provided on the opposite side of the transmitter 11 to measure the remaining amount of solution in the container 9 by the transfer function. The receiver 13 may be configured in various ways, but FIG. 3 illustrates a microphone.

상술한 바와 같이 구성되는 체적 변화량 측정장치의 작용을 설명한다.The operation of the volume change measuring device configured as described above will be described.

트랜스미터(11)의 백색 소음 발생기(15)에서 백색 소음 신호를 발생시킨다.The white noise generator 15 of the transmitter 11 generates a white noise signal.

이 백색 소음 신호는 백색 소음 스펙트럼(19)을 통하여 라우드 스피커(17)로 전달된다.This white noise signal is transmitted to the loudspeaker 17 via the white noise spectrum 19.

이 라우드 스피커(17)는 백색 소음 발생기(15)에서 발생된 모든 소음 신호 성분을 재생시킨다.This loudspeaker 17 reproduces all noise signal components generated by the white noise generator 15.

이렇게 재생된 소음 신호는 햄 홀쯔 공진기(Helmholtz Resonator) 역할을 하는 용기(9)의 용액이 없는 부분을 통하여 리시버(13)로 전달된다.The regenerated noise signal is transmitted to the receiver 13 through the solution-free portion of the container 9 serving as a Helmholtz Resonator.

이 때, 햄 홀쯔 공진 주파수(fc)에 해당하는 성분을 제거한다. 이 소음 신호를 리시버(13)로 측정한다.At this time, the component corresponding to the ham Holtz resonance frequency fc is removed. This noise signal is measured by the receiver 13.

이 소음 신호의 주파수를 분석하면 용기(9)에서 용액이 없는 부분에 대한 햄 홀쯔 공진 주파수(fc)를 측정할 수 있다.By analyzing the frequency of this noise signal, the Hamholtz resonant frequency fc for the absence of solution in the vessel 9 can be measured.

c는 사운드의 스피드, Ln은 넥크(21) 길이, S는 넥크(21) 단면적, V는 용액이 없는 부분의 체적을 나타낸다.c is the speed of the sound, Ln is the length of the neck 21, S is the cross-sectional area of the neck 21, V is the volume of the portion without the solution.

즉, 백색 소음 발생기(15)에서 발생된 소음 신호와 리시버(13)에서 측정된 소음 신호 사이의 전달함수를 측정하며 용기(9)에서 용액이 없는 부분의 체적(V)을구할 수 있다.That is, the transfer function between the noise signal generated by the white noise generator 15 and the noise signal measured by the receiver 13 is measured, and the volume V of the part without the solution in the container 9 can be obtained.

따라서 용액 잔량(ΔV)은 용기(9) 전체의 체적(V0)에서 용액이 없는 공간의 공기 체적(V)을 차감하여 구할 수 있다.Therefore, the remaining solution amount ΔV can be obtained by subtracting the air volume V of the space without the solution from the volume V0 of the entire container 9.

△V = V0 - VΔV = V0-V

결국, 본 실시예의 체적 변화량 측정장치가 차량의 연료 게이지로 사용되면, 차량의 기울기에 따른 연료 레벨 변화에도 잔존 연료량을 정확하게 측정할 수 있다. 따라서 운전자의 불안을 해소할 수 있다.As a result, when the volume change amount measuring apparatus of the present embodiment is used as the fuel gauge of the vehicle, it is possible to accurately measure the remaining fuel amount even when the fuel level changes due to the inclination of the vehicle. Therefore, the driver's anxiety can be solved.

그리고 연료탱크의 형상이 복잡한 경우에도 게이지에 나타나는 값이 실제 연료의 변화량과 선형적으로 일치하므로 정확한 연비 계산을 가능하게 한다.And even when the shape of the fuel tank is complicated, the value displayed on the gauge is linearly matched with the actual fuel change, thereby enabling accurate fuel economy calculation.

상술한 바와 같이 본 발명에 따른 체적 변화량 측정장치는 용기의 상단에 설치된 트랜스미터가 백색 소음 신호를 발생시키고 용기의 공간을 통하여 전달되는 신호를 리시버가 측정하므로 트랜스미터의 신호와 리시버 신호 사이의 전달함수를 측정할 수 있다.As described above, the volume change measuring apparatus according to the present invention generates a white noise signal by a transmitter installed at the top of the container, and the receiver measures the signal transmitted through the space of the container. It can be measured.

따라서 본 발명의 체적 변화량 측정장치는 상기 전달함수를 측정함으로써 용기 내에서 용액의 레벨 변화에도 불구하고 용액의 잔량을 정확하게 측정하고, 실제 용액 변화량을 선형적으로 나타낼 수 있다.Therefore, the volume change measuring apparatus of the present invention can accurately measure the residual amount of the solution despite the level change of the solution in the container by measuring the transfer function, and can represent the actual solution change linearly.

Claims (5)

a)햄 홀쯔 공진기(Helmholtz Resonator) 역할을 하도록 용액을 담는 밀폐된 공간의 일정 체적을 형성하는 용기,a) a container that forms a volume in a closed space containing a solution to serve as a Helmholtz Resonator, b)상기 용기의 공간에 백색 소음 신호를 전달할 수 있도록 상기 용기의 일 측에 설치되어 백색 소음 신호를 발생시키는 트랜스미터,b) a transmitter installed at one side of the container to transmit a white noise signal to the space of the container, generating a white noise signal, c)상기 트랜스미터에서 발생된 상기 백색 소음 신호가 전달함수에 의하여 상 기 용기의 공간을 통하여 전달되는 소음 신호를 측정하여 상기 용기 내의 용액 잔량을 측정하는 리시버,c) a receiver for measuring the residual amount of solution in the vessel by measuring the noise signal transmitted through the space of the vessel by the transfer function of the white noise signal generated by the transmitter, 를 포함하는 체적 변화량 측정장치.Volume change measuring device comprising a. 청구항 1에 있어서, 상기 b)트랜스미터는,The method according to claim 1, wherein b) the transmitter, d)백색 소음 신호를 발생시키는 백색 소음 발생기,d) white noise generator, generating a white noise signal, e)상기 백색 소음 발생기에서 발생된 상기 백색 소음 신호의 모든 성분을 재 생시키는 라우드 스피커,e) a loudspeaker that reproduces all components of the white noise signal generated by the white noise generator, 를 포함하는 체적 변화량 측정장치.Volume change measuring device comprising a. 청구항 1에 있어서, 상기 c)리시버는,The method according to claim 1, wherein c) the receiver, 마이크로폰으로 구성됨을 특징으로 하는 체적 변화량 측정장치.Volume change measuring device, characterized in that consisting of a microphone. 청구항 1에 있어서, 상기 용액 잔량(ΔV)은,The method according to claim 1, wherein the remaining amount of solution (ΔV), 상기 용기 전체의 체적(V0)에서 용액이 없는 공간의 공기 체적(V)을 차감하여 구하는 체적 변화량 측정장치.And a volume change amount measuring device obtained by subtracting an air volume (V) of a space without a solution from the volume (V0) of the entire container. 청구항 4에 있어서, 상기 공기 체적(V)은,The method according to claim 4, wherein the air volume (V), 햄 홀쯔 공진 주파수를 이용하여 구함을 특징으로 하는 체적 변화량 측정장치.Volume change measurement device characterized in that obtained by using the Ham Holtz resonant frequency.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010024058A1 (en) * 2010-06-17 2011-12-22 Airbus Operations Gmbh Device for determining filling level of container, has sound sensor attached to container, where sound sensor is connected to evaluation unit, and evaluation unit is arranged for determining helmholtz frequency of sound waves
CN110166895A (en) * 2018-02-13 2019-08-23 许丽莲 The ultralow audio frequency sound wave generation device of suction strainer noise

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10148560A (en) * 1996-11-18 1998-06-02 Ono Sokki Co Ltd Liquid-level detecting apparatus
JPH10153466A (en) * 1996-11-21 1998-06-09 Denso Corp Volume measuring device
JPH11281462A (en) * 1998-03-27 1999-10-15 Toshiba Corp Liquid level gage
JP2000241226A (en) * 1999-02-24 2000-09-08 Maeda Science:Kk Volumeter
JP2000329602A (en) * 1999-05-24 2000-11-30 Hitachi Zosen Corp Ice storage tank and method for measuring ice filling rate thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10148560A (en) * 1996-11-18 1998-06-02 Ono Sokki Co Ltd Liquid-level detecting apparatus
JPH10153466A (en) * 1996-11-21 1998-06-09 Denso Corp Volume measuring device
JPH11281462A (en) * 1998-03-27 1999-10-15 Toshiba Corp Liquid level gage
JP2000241226A (en) * 1999-02-24 2000-09-08 Maeda Science:Kk Volumeter
JP2000329602A (en) * 1999-05-24 2000-11-30 Hitachi Zosen Corp Ice storage tank and method for measuring ice filling rate thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010024058A1 (en) * 2010-06-17 2011-12-22 Airbus Operations Gmbh Device for determining filling level of container, has sound sensor attached to container, where sound sensor is connected to evaluation unit, and evaluation unit is arranged for determining helmholtz frequency of sound waves
CN110166895A (en) * 2018-02-13 2019-08-23 许丽莲 The ultralow audio frequency sound wave generation device of suction strainer noise

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