WO2016104466A1 - Dispositif de détection de surface d'un liquide - Google Patents

Dispositif de détection de surface d'un liquide Download PDF

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Publication number
WO2016104466A1
WO2016104466A1 PCT/JP2015/085758 JP2015085758W WO2016104466A1 WO 2016104466 A1 WO2016104466 A1 WO 2016104466A1 JP 2015085758 W JP2015085758 W JP 2015085758W WO 2016104466 A1 WO2016104466 A1 WO 2016104466A1
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WO
WIPO (PCT)
Prior art keywords
propagation
wave
vibration
liquid level
internal
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Application number
PCT/JP2015/085758
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English (en)
Japanese (ja)
Inventor
政稔 市村
小出　茂樹
博行 鈴木
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日本精機株式会社
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Publication of WO2016104466A1 publication Critical patent/WO2016104466A1/fr

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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

Definitions

  • the present invention relates to a liquid level detection device that detects the liquid level of a liquid in a tank using ultrasonic waves.
  • the conventional liquid level detection device is a method for detecting the surface of an ultrasonic wave propagating through the ultrasonic good conductor by a change in the contact length between the ultrasonic good conductor and the liquid when a part of the ultrasonic good conductor in the gas is in the liquid.
  • the level of the liquid was measured using the fact that the wave propagation time changes (see Patent Document 1).
  • the liquid level detection device using ultrasonic waves is influenced by temperature in principle, the liquid level detection device or a temperature sensor for detecting the temperature of the liquid to be measured is provided, and the temperature detected by the temperature sensor is corrected. It has been considered to detect the liquid level.
  • the provision of the temperature sensor causes an increase in manufacturing cost, and it is necessary to perform measurement using the temperature sensor, which causes a problem that the detection process becomes complicated.
  • the present invention pays attention to the above-mentioned problems, and provides a liquid level detecting device capable of detecting a liquid level with high accuracy without using a temperature sensor.
  • the present invention provides a propagating body that is immersed in a liquid, a vibration generating means that applies vibration to the propagating body, a vibration detecting means that detects vibration of the propagating body, and a drive that drives the vibration generating means.
  • Position detecting means for outputting a signal and propagating a wave generated by the vibration of the vibration generating means to propagate and reflect on the propagating body and receive a measurement signal detected by the vibration detecting means to detect the position of the liquid surface of the liquid
  • the vibration generating means generates a surface wave on the surface of the propagating body and generates an internal propagating wave inside the propagating body
  • the position detecting means The vibration of the surface wave propagated and reflected by the propagating body is detected and the measurement signal is output, and the reference signal is detected by detecting the vibration of the internal propagating wave propagated and reflected by the internal propagating wave.
  • the position detection means corrects the propagation time of the surface wave obtained from the drive signal and the measurement signal by the propagation time of the internal propagation wave obtained from the drive signal and the reference signal, It is to detect.
  • liquid level detection apparatus that can achieve the intended purpose and can accurately detect the liquid level using ultrasonic waves without using a temperature sensor.
  • the block diagram of 1st Embodiment of this invention The side view of the propagation body of the embodiment.
  • the wave form diagram which shows the surface wave and internal propagation wave of the embodiment.
  • (A) is a figure which shows the relationship between the propagation time of an internal propagation wave, and temperature
  • (b) is a figure which shows the relationship between the propagation time of a surface wave, and a liquid level position.
  • the liquid level detection device F includes at least a propagation body 1, vibration generation detection means 2, and position detection means 3 as shown in FIG.
  • the propagating body 1 is immersed in a liquid L stored in a tank (not shown), for example, a medium such as gasoline or alcohol.
  • the propagation body 1 is a material that can transmit vibrations satisfactorily.
  • the propagation body 1 is mainly composed of a synthetic resin, particularly polyphenylene sulfide (PPS), and an additive is added in some cases.
  • the shape of the propagating body 1 is a columnar body, and includes a propagation surface composed of a plane on which a surface wave W1 to be described later propagates.
  • the propagating body 1 is a quadrangular column.
  • a notched groove 1a is provided in a part thereof.
  • the groove 1a includes an internal propagation wave reflecting portion 1b that reflects an internal propagation wave to be described later.
  • the vibration generation detection unit 2 is a vibration generation unit that applies vibration to the propagation body 1 and is a vibration detection unit that detects the vibration of the propagation body 1.
  • the vibration generation detection means 2 includes a piezoelectric element 2a, a transmission circuit 2b that transmits a signal for driving the piezoelectric element 2a, and a reception circuit 2c that receives a signal detected by the piezoelectric element 2a.
  • the piezoelectric element 2a generates a surface wave W1 and an internal propagation wave W2 on the propagating body 1 and has no groove 1a up to the other end of the propagating body 1 in order to detect the surface wave W1 and the internal propagating wave W2.
  • the piezoelectric element 2a is installed so as to protrude.
  • the propagating body 1 and the piezoelectric element 2a are fixed in close contact.
  • the piezoelectric element 2a applies vibration to the propagating body 1 to generate a surface wave W1 on the surface of the propagating body 1 and an internal propagation wave W2 inside the propagating body 1.
  • vibration of the propagating body 1 (vibration caused by the surface wave W1 and the internal propagation wave W2) is detected and converted into a voltage.
  • the surface wave W1 includes a Rayleigh wave, a leaky Rayleigh wave, and a transverse surface acoustic wave
  • the internal propagation wave W2 includes a transverse wave.
  • the transmission circuit 2b drives the piezoelectric element 2a.
  • the transmission circuit 2b includes a drive circuit and a transformer (not shown). A voltage is applied.
  • the receiving circuit 2c detects a signal output from the piezoelectric element 2a and outputs a signal to the position detecting means 3, and includes, for example, an input protection circuit, an amplifier circuit, a band pass filter, a waveform shaping circuit, etc. (not shown).
  • the vibration detected by the piezoelectric element 2a is output to the position detection means 3 as a signal.
  • the vibration generated in the propagation body 1 will be described with reference to FIG. FIG. 4 is shown schematically.
  • the leftmost vibration is the vibration V1 generated by the piezoelectric element 2a by the drive signal S1 output from the position detecting means 3.
  • the second vibration from the left is the vibration V ⁇ b> 2 of the internal propagation wave W ⁇ b> 2 that has traveled through the propagation body 1 and reflected back by the internal propagation wave reflection portion 1 b of the propagation body 1.
  • the rightmost vibration is the vibration V ⁇ b> 3 of the surface wave W ⁇ b> 1 that is transmitted through the surface of the propagating body 1, reflected at the other end of the propagating body 1, and returned.
  • a signal output from the receiving circuit 2c due to the vibration V3 of the surface wave W1 is referred to as a measurement signal S3, and a signal output from the receiving circuit 2c due to the vibration V2 of the internal propagation wave W2 is referred to as a reference signal S2.
  • the surface wave W1 has a property that the speed of the surface wave W1 traveling through the propagating body 1 is slow in the portion where the propagating body 1 is immersed in the liquid L, and the liquid surface LS of the liquid L is affected by the propagation time T2 of the surface wave W1. Can be detected.
  • the propagation time T1 of the internal propagation wave W2 is the internal propagation wave W2 that is generated by the internal propagation wave W2 from the time t1 when the control unit 3a of the position detection unit 3 outputs the drive signal S1 and reflected by the vibration generation detection unit 2.
  • the time T2 from the time t1 when the control unit 3a of the position detecting means 3 outputs the drive signal S1 to the time t2 until the time t2 at which the reference signal S2 is detected and output is received. This is the time until time t3 when receiving the measurement signal S3 generated and detected by the surface wave W1 reflected at the other end of the propagating body 1.
  • the receiving circuit 2c of the vibration generation detecting means 2 outputs a measurement signal S3 obtained by detecting the vibration V3 of the surface wave W1 propagated and reflected by the surface wave W1 through the propagation body 1 to the position detecting means 3, and the internal propagation wave W2 propagates.
  • a reference signal S2 obtained by detecting the vibration V2 of the internal propagation wave W2 propagated and reflected by the body 1 is output to the position detection means 3.
  • the position detection means 3 includes at least a control unit 3a composed of a microcomputer or the like and a storage means 3b.
  • the position detection unit 3 outputs a drive signal S1 that drives and vibrates the vibration generation detection unit 2, and the surface wave W1 and the internal propagation wave W2, which are propagation waves generated by the vibration of the vibration generation detection unit 2, are propagated by the propagation body 1.
  • the position of the liquid surface LS of the liquid L is detected by detecting the vibration of the surface wave W1 and the internal propagation wave W2 by the vibration generation detecting means 2.
  • the control unit 3a includes a CPU that performs processing executed by the control unit 3a, a RAM that functions as a main memory of the CPU, a ROM that stores various programs that cause the control unit 3a to execute predetermined processing, and the control unit 3a. And various converters that digitally convert input / output information (signals) for the CPU and analog convert for output.
  • the storage means 3b is a non-volatile memory or the like and stores the relationship between the propagation time T1 of the internal propagation wave W2 and the temperature of the propagation body 1 shown in FIG.
  • the position detection means 3 obtains the temperature of the propagation body 1 with reference to the storage means 3b based on the propagation time T1 of the internal propagation wave W2 obtained from the drive signal S1 and the reference signal S2, and is driven by the temperature of the propagation body 1.
  • the liquid surface LS is accurately detected by correcting the propagation time T2 of the surface wave W1 obtained from the signal S1 and the measurement signal S3.
  • step ST1 the position detection means 3 outputs a drive signal S1.
  • step ST2 the position detection means 3 determines whether or not the reference signal S2 is detected based on the internal propagation wave W2 generated in the propagation body 1 by the drive signal S1. If it is determined that the reference signal S2 has been detected, the process proceeds to step ST3. When it determines with not detecting, it returns to step ST1.
  • the position detection means 3 obtains a propagation time T1 in which the internal propagation wave W2 propagates through the propagation body 1.
  • the propagation time T1 is obtained as the propagation time T1 from the output of the drive signal S1 to the input of the reference signal S2.
  • the time to receive the signal is considered to be negligible.
  • step ST4 the position detection means 3 obtains the temperature of the propagation body 1 with reference to the storage means 3b from the propagation time T1 of the reference signal S2.
  • step ST5 the position detection means 3 determines whether or not the measurement signal S3 is detected based on the surface wave W1 generated on the surface of the propagation body 1 by the drive signal S1. If it is determined that the measurement signal S3 has been detected, the process proceeds to step ST6. When it determines with not detecting, it returns to step ST1.
  • step ST6 the position detection means 3 obtains a propagation time T2 in which the surface wave W1 propagates on the surface of the propagation body 1.
  • step ST7 the position detecting means 3 calculates the propagation time T2 of the surface wave W1 based on the temperature of the propagating body 1 obtained in step ST4 by the correction coefficient (a, b) based on the temperature of the propagating body 1.
  • the liquid level LS is detected based on the corrected propagation time.
  • the formula which makes propagation time T2 a solution is represented by the following linear formula.
  • the propagating body 1 immersed in the liquid L, the vibration generating means 2 for applying vibration to the propagating body 1, the vibration detecting means 2 for detecting the vibration of the propagating body 1, and the drive signal for driving the vibration generating means 2 are output.
  • the vibration generating means 2 generates a surface wave W1 on the surface of the propagating body 1 and an internal propagating wave W2 inside the propagating body 1, and the vibration detecting means 2 is a surface wave.
  • the position detection means 3 is driven By detecting the liquid level LS by correcting the propagation time T2 of the surface wave W1 obtained from the driving signal S1 and the measurement signal S3 by the propagation time T1 of the internal propagation wave W2 obtained from the signal S1 and the reference signal S2, the temperature sensor Therefore, it is possible to provide a liquid level detection apparatus capable of detecting a liquid level with high accuracy without using an ultrasonic wave.
  • storage means 3b for storing the relationship between the propagation time T2 of the internal propagation wave W2 obtained from the drive signal S1 and the reference signal S2 and the temperature of the propagation body 1, and the position detection means 3 is stored in the storage means 3b.
  • the propagating body 1 is provided with the internal propagation wave reflecting portion 1b, it is possible to provide a liquid level detecting device capable of detecting the liquid level with high accuracy without using a temperature sensor. Furthermore, the surface wave W1 and the internal propagation wave W2 can be obtained by the same drive signal S1, the detection process is simplified, and the cost can be reduced.
  • the storage unit 3b indicates the position of the liquid level LS related to the propagation time T2 of the surface wave W1 for each predetermined temperature (for example, every 5 degrees Celsius) of the propagation body 1.
  • FIG. 5B illustrates another example of 0 degrees Celsius, 5 degrees Celsius, and 10 degrees Celsius.
  • the position detecting means 3 detects the position of the liquid level LS by obtaining the position of the liquid level LS related to the propagation time T2 of the surface wave W1 based on the temperature of the propagating body 1 stored in the storage means 3b. Also good.
  • the groove 1a is formed by cutting out the internal propagation wave reflection portion 1b.
  • the present invention is not limited to this embodiment.
  • a part of the propagating body 1 cut out to the bottom surface and formed into a key shape, a screw stopper, or another member fitted in the groove 1a may be used.
  • the another member may be a resin or a metal.
  • the liquid level of liquid fuel such as gasoline or alcohol is detected.
  • the liquid level is not limited to liquid fuel such as gasoline or alcohol, and other liquids such as water are detected. It is also possible to do.
  • a use is not limited to vehicles, such as a vehicle, It can utilize for a wide use.
  • the shape of the propagating body 1 is not limited to a quadrangular prism, and may be any plane as long as the surface wave W1 can propagate.
  • a cross-sectional shape perpendicular to the longitudinal direction of the propagating body 1 may be D-shaped or the like.
  • the present invention relates to a liquid level detection apparatus, and in particular, can be used for a liquid level detection apparatus that detects a liquid level using ultrasonic waves.
  • Liquid level detection device L Liquid LS Liquid level S1 Drive signal S2 Reference signal (internal propagation wave W2) S3 Measurement signal (surface wave W1) T1 propagation time (internal propagation wave W2) T2 Propagation time (surface wave W1) V1 vibration V2 vibration (internal propagation wave) V3 vibration (surface wave) W1 Surface wave W2 Internal propagation wave 1 Propagator 1a Groove 1b Internal propagation wave reflection part 2 Vibration generation detection means (vibration generation means, vibration detection means) 2a Piezoelectric element 2b Transmission circuit 2c Reception circuit 3 Position detection means 3a Control unit 3b Storage means

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

L'invention concerne un dispositif de détection de surface d'un liquide permettant de détecter avec précision la surface d'un liquide à l'aide d'ultrasons et sans l'aide d'un capteur de température. Un moyen de génération de vibrations 2 génère une onde de surface W1 sur la surface d'un corps de propagation 1 et génère une onde de propagation interne W2 à l'intérieur du corps de propagation 1. Un moyen de détection de vibrations 2 délivre en sortie un signal de mesure en détectant la vibration de l'onde de surface W1 qui s'est propagée à travers le corps de propagation 1 et a été réfléchie, et délivre en sortie un signal de référence en détectant la vibration de l'onde de propagation interne W2 qui s'est propagée à travers le corps de propagation 1 et a été réfléchie. Un moyen de détection de position 3 corrige un temps de propagation de l'onde de surface W1 déterminé à partir d'un signal d'entraînement et du signal de mesure à l'aide d'un temps de propagation de l'onde de propagation interne W2 déterminé à partir du signal d'entraînement et du signal de référence et détecte la surface d'un liquide (LS).
PCT/JP2015/085758 2014-12-26 2015-12-22 Dispositif de détection de surface d'un liquide WO2016104466A1 (fr)

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JP2014264163A JP6270055B2 (ja) 2014-12-26 2014-12-26 液面検出装置
JP2014-264163 2014-12-26

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018040661A (ja) * 2016-09-07 2018-03-15 日本精機株式会社 液面検出装置、及び液面検出装置の製造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5427149B2 (fr) * 1973-02-12 1979-09-07
JPH05231905A (ja) * 1990-08-06 1993-09-07 Tidel Eng Inc 距離測定装置及び方法
JP4095960B2 (ja) * 2001-07-27 2008-06-04 エンドレス ウント ハウザー ゲーエムベーハー ウント コンパニー コマンディートゲゼルシャフト 伝播時間原理に基づき動作する充填レベル測定装置を用いた、容器内媒体の充填レベル測定方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8248888B1 (en) * 2010-08-04 2012-08-21 Measurement Specialties, Inc. Bottom up contact type ultrasonic continuous level sensor
DE102011118711A1 (de) * 2011-11-16 2013-05-16 Seuffer Gmbh & Co.Kg Messvorrichtung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5427149B2 (fr) * 1973-02-12 1979-09-07
JPH05231905A (ja) * 1990-08-06 1993-09-07 Tidel Eng Inc 距離測定装置及び方法
JP4095960B2 (ja) * 2001-07-27 2008-06-04 エンドレス ウント ハウザー ゲーエムベーハー ウント コンパニー コマンディートゲゼルシャフト 伝播時間原理に基づき動作する充填レベル測定装置を用いた、容器内媒体の充填レベル測定方法

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JP2016125825A (ja) 2016-07-11

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