WO2014188688A1 - Dispositif capteur - Google Patents

Dispositif capteur Download PDF

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Publication number
WO2014188688A1
WO2014188688A1 PCT/JP2014/002589 JP2014002589W WO2014188688A1 WO 2014188688 A1 WO2014188688 A1 WO 2014188688A1 JP 2014002589 W JP2014002589 W JP 2014002589W WO 2014188688 A1 WO2014188688 A1 WO 2014188688A1
Authority
WO
WIPO (PCT)
Prior art keywords
introduction hole
pressure sensor
frequency
electrical signal
processing unit
Prior art date
Application number
PCT/JP2014/002589
Other languages
English (en)
Japanese (ja)
Inventor
為治 太田
Original Assignee
株式会社デンソー
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社デンソー filed Critical 株式会社デンソー
Priority to DE112014002479.1T priority Critical patent/DE112014002479B4/de
Publication of WO2014188688A1 publication Critical patent/WO2014188688A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
    • G01L27/007—Malfunction diagnosis, i.e. diagnosing a sensor defect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/08—Means for indicating or recording, e.g. for remote indication
    • G01L19/12—Alarms or signals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/013—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
    • B60R21/0136—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over responsive to actual contact with an obstacle, e.g. to vehicle deformation, bumper displacement or bumper velocity relative to the vehicle

Definitions

  • the present disclosure relates to a sensor device including a pressure sensor, a processing unit that processes an electrical signal of the pressure sensor, and a housing that houses the pressure sensor and the processing unit and that introduces a fluid to be measured to the pressure sensor. It is about.
  • Patent Document 1 a pressure sensor in which a sensor element for pressure detection is accommodated inside a sensor body, a chamber member in which a chamber space is formed and disposed in a vehicle bumper, .
  • a vehicle collision detection device detects a pressure in a chamber space by a sensor element, and detects a collision with a vehicle bumper based on the pressure detection result.
  • the chamber member is provided with an opening for communicating the chamber space to the outside and an opening for fixing the sensor body.
  • the sensor body is provided with a pressure inlet for introducing pressure in the chamber space.
  • the sensor main body is fixed to one of the two openings of the chamber member. Therefore, when the other opening of the chamber member (introduction hole) is blocked by a foreign substance (for example, ice), a desired pressure cannot be detected.
  • a sensor device houses a pressure sensor that converts the pressure of a fluid to be measured into an electrical signal, a processing unit that processes the electrical signal of the pressure sensor, a pressure sensor, and a processing unit.
  • a stationary wave having a resonance frequency determined by the shape and state of the introduction hole by vibrating the housing to which the fluid to be measured is introduced to the pressure sensor and the fluid to be measured in the introduction hole are vibrated. And a vibrating portion to be generated.
  • One end of the introduction hole is opened, the other end is closed, and the pressure sensor is provided in the housing so that the pressure sensor can detect the pressure of the fluid to be measured in the introduction hole.
  • the pressure sensor When a standing wave is generated in the introduction hole by the vibration unit, the pressure sensor outputs an electrical signal whose amplitude varies periodically according to the resonance frequency, and the processing unit outputs the electric signal of the pressure sensor according to the resonance frequency. Based on the frequency of the signal, it is determined whether or not the introduction hole is blocked by foreign matter.
  • the introduction hole is blocked by foreign matter. Therefore, when the introduction hole is obstruct
  • the processing unit has a threshold value based on the frequency of the electrical signal output from the pressure sensor when the introduction hole is not completely blocked by the foreign matter, and the processing unit includes: Based on the magnitude relationship between the frequency of the electrical signal output from the pressure sensor and the threshold value, it is determined whether or not the introduction hole is blocked by foreign matter.
  • the frequency of the standing wave formed in the introduction hole (hereinafter referred to as resonance frequency) is likely to be different from the resonance frequency of the standing wave in the open state. Therefore, for example, when determining whether or not the introduction hole is closed based on the frequency of the electrical signal of the pressure sensor in the open state, the introduction hole is only partially closed. Therefore, there is a risk of determining that the state is closed. Therefore, as described above, the threshold value is determined based on the electrical signal output from the pressure sensor when the introduction hole is not completely closed. By doing so, it is possible to suppress erroneous determination of the closed state of the introduction hole as compared with the above-described comparative configuration.
  • the vibration part is provided in the introduction hole. According to this, even if a foreign substance adheres in the introduction hole, the foreign substance can be removed by the vibration of the vibration part.
  • the threshold is higher than the frequency of the electrical signal output from the pressure sensor when the introduction hole is open, and from the pressure sensor when the introduction hole is blocked by a foreign object.
  • the frequency is set lower than the frequency of the electrical signal to be output, and when the processing unit determines that the frequency of the electrical signal output from the pressure sensor is lower than the threshold value, it is determined that the introduction hole is not blocked by the foreign matter.
  • it is determined that the frequency of the electric signal output from the pressure sensor is equal to or higher than the threshold value it is determined that the introduction hole is blocked by the foreign matter.
  • the vibration part When the vibration part is provided in the introduction hole, whether the introduction hole is closed or not, the fluid to be measured in the introduction hole is vibrated by the vibration part, and a standing wave is generated in the introduction hole.
  • the resonance frequency of the standing wave generated in the introduction hole differs depending on whether or not the introduction hole is closed.
  • the resonance frequency in the closed state is higher than the resonance frequency in the open state, which is approximately twice. Therefore, the threshold is set higher than the frequency of the electrical signal output from the pressure sensor in the open state and lower than the frequency of the electrical signal output from the pressure sensor in the closed state.
  • the processing unit determines that the frequency of the electrical signal output from the pressure sensor is lower than the threshold, the processing unit determines that the introduction hole is in an open state, and the frequency of the electrical signal output from the pressure sensor is equal to or greater than the threshold. If it is determined that there is, the introduction hole is determined to be in a closed state.
  • the vibration part is provided on one end side of the inner wall of the introduction hole. According to this, unlike the configuration in which the vibration part is provided on the other end side of the inner wall of the introduction hole, it is possible to suppress the vibration having the inherent frequency generated in the vibration part from being transmitted to the pressure sensor. . Therefore, it is suppressed that the precision which determines whether the introduction hole is obstruct
  • the vibration part may be provided not only on one end side of the inner wall of the introduction hole but on the entire surface. According to this, as compared with the configuration in which the vibration part is provided on a part of the inner wall of the introduction hole, the foreign matter attached to the introduction hole can be removed regardless of the attachment location.
  • FIG. 4 is a sectional view taken along line IV-IV shown in FIG. 3.
  • FIG. 3 the cross-sectional shape of the introduction hole 31 is represented by a broken line, and the inner panel 200 is omitted in FIGS. 3 and 4.
  • FIG. 4 the control circuit 203 mounted on the vehicle is schematically shown as a block, and the electrical connection between the control circuit 203 and the sensor device 100 is indicated by a broken line.
  • x direction three directions that are orthogonal to each other are indicated as an x direction, a y direction, and a z direction.
  • the plane defined by the x direction and the y direction is the xy plane
  • the plane defined by the y direction and the z direction is the yz plane
  • the plane defined by the z direction and the x direction is z ⁇ . Shown as x-plane.
  • the sensor device 100 As shown in FIG. 1, the sensor device 100 according to the present embodiment is provided on an inner panel 200 inside the door. As shown in FIG. 4, the sensor device 100 includes a pressure sensor 10, a processing unit 20, a housing 30, and a vibration unit 40. The pressure sensor 10 converts the pressure of the fluid to be measured into an electrical signal. An electrical signal output from the pressure sensor 10 is input to the processing unit 20.
  • the processing unit 20 performs processing such as foreign object detection processing based on the received electrical signal.
  • the housing 30 houses the pressure sensor 10 and the processing unit 20.
  • the housing 30 is formed with an introduction hole 31 that guides the fluid to be measured to the pressure sensor 10.
  • the vibration part 40 vibrates the fluid to be measured in the introduction hole 31 and generates a standing wave having a resonance frequency determined by the shape and state (open state or closed state described later) of the introduction hole 31.
  • a standing wave is applied to the pressure sensor 10
  • an electrical signal whose amplitude periodically varies according to the resonance frequency is output from the pressure sensor 10.
  • the fluid to be measured is air.
  • the introduction hole 31 is normally in a state where one end is opened and the other end is closed (hereinafter, referred to as an open state for convenience). However, when one end of the introduction hole 31 is closed by a foreign matter such as water sprayed on the vehicle or ice formed by freezing water in the atmosphere, the introduction hole 31 is closed (hereinafter referred to as a closed state for convenience). Show).
  • the state of the introduction hole 31 changes in this way, the resonance frequency of the standing wave generated by the vibration unit 40 also changes.
  • the pressure applied to the pressure sensor 10 also varies, and the frequency of the electrical signal output from the pressure sensor 10 also changes.
  • the processing unit 20 determines whether one end of the introduction hole 31 is closed based on the frequency of the electrical signal of the pressure sensor 10. In other words, the processing unit 20 determines whether the introduction hole 31 is in an open state or a closed state based on the frequency of the electrical signal of the pressure sensor 10.
  • the processing unit 20 determines whether the introduction hole 31 is in an open state or a closed state based on the frequency of the electrical signal of the pressure sensor 10.
  • the pressure sensor 10 normally outputs an electric signal corresponding to a pressure fluctuation in a space (hereinafter, referred to as a detected space 202) formed between the inner panel 200 and the outer panel 201 of the vehicle due to an external force applied to the vehicle. It performs the function to output.
  • This electrical signal is output to a control circuit 203 that controls the airbag system of the vehicle.
  • the control circuit 203 controls the driving of the airbag based on the electric signal from the pressure sensor 10.
  • the pressure sensor 10 also functions to output an electrical signal corresponding to the resonance frequency of the standing wave to the processing unit 20 when the introduction hole 31 is inspected.
  • the pressure sensor 10 is provided on one surface 11 a of the wiring board 11.
  • a processing unit 20 is provided on the one surface 11a, and a capacitor 12 is provided on the back surface 11b.
  • Each of the pressure sensor 10, the processing unit 20, and the capacitor 12 is electrically connected via the wires 13 and the wiring of the wiring board 11 to form a circuit.
  • the processing unit 20 has a threshold value based on the frequency of the electrical signal output from the pressure sensor 10 when one end of the introduction hole 31 is not completely closed by the foreign matter. Based on the magnitude relationship between the frequency and the threshold value, it is determined whether one end of the introduction hole 31 is closed by a foreign object. As will be described later, the vibrating portion 40 is provided in the introduction hole 31. Therefore, regardless of whether one end of the introduction hole 31 is closed, the fluid to be measured in the introduction hole 31 is vibrated by the vibration unit 40, and a standing wave is generated in the introduction hole 31. However, the resonance frequency of the standing wave generated in the introduction hole 31 varies depending on whether or not the introduction hole 31 is closed.
  • the threshold is set higher than the frequency of the electrical signal output from the pressure sensor 10 in the open state and lower than the frequency of the electrical signal output from the pressure sensor 10 in the closed state.
  • the processing unit 20 determines that the frequency of the electrical signal output from the pressure sensor 10 is lower than the threshold, the processing unit 20 determines that the introduction hole 31 is in an open state, and the frequency of the electrical signal output from the pressure sensor 10 is When it determines with it being more than a threshold value, it determines with the introduction hole 31 being a blockade state.
  • the resonance frequency of the standing wave formed in the introduction hole 31 is the steady wave in the open state.
  • the resonance frequency may be slightly different.
  • the resonance frequency of the standing wave may approach the resonance frequency of the closed state from the resonance frequency of the open state.
  • the threshold value is set higher by a predetermined value than the frequency of the electric signal output from the pressure sensor 10 when one end of the introduction hole 31 is not closed at all by the foreign matter. Yes.
  • This predetermined value is determined by whether or not the degree of blocking of the introduction hole 31 by a foreign substance affects the detection accuracy of the pressure of the fluid to be detected. That is, when the detected resonance frequency is higher than the resonance frequency in the open state and lower than the threshold value, the detection accuracy of the pressure of the fluid to be detected does not decrease so much, and the pressure of the fluid to be detected can be detected. It is considered to be in an open state. On the other hand, if the detected resonance frequency is higher than the threshold value and lower than the resonance frequency in the closed state, the detection accuracy of the pressure of the detected fluid is significantly lowered, and the pressure of the detected fluid cannot be detected. Is considered to be in a blocked state.
  • the processing unit 20 includes a filter that extracts a frequency in a specific band, a measurement unit that measures the frequency of an electric signal of the pressure sensor 10 via the filter, and a frequency that is measured by the measurement unit.
  • a comparison unit that compares the reference frequency corresponding to the threshold value. At this time, for example, if a Hi signal is output from the comparison unit, it is determined that one end of the introduction hole 31 is closed by a foreign object, and if a Lo signal is output from the comparison unit, it is determined that one end of the introduction hole 31 is not closed by a foreign object. Is done.
  • the housing 30 is attached and fixed to the inner panel 200 while housing the pressure sensor 10 and the processing unit 20.
  • a plurality of terminals 32 are insert-molded in the housing 30, and some of the terminals 32 are electrically connected to a circuit formed on the wiring board 11 via the wires 14 and are electrically connected to the vibration unit 40. The remaining terminals 32 are electrically connected to the wiring board 11 via the wires 15.
  • the housing 30 communicates the storage portion 33 having a storage space for storing the wiring substrate 11, the support portion 34 for supporting the wiring substrate 11 stored in the storage space, and the storage space and the detected space 202. And an introduction part 35 in which an introduction hole 31 for introducing a fluid to be measured to the pressure sensor 10 is formed.
  • the support portion 34 has an annular shape, and one of two open ends formed by the support portion 34 communicates with the introduction hole 31.
  • one end of the support portion 34 is fixed to the storage portion 33 so as to surround the other end of the introduction hole 31, and the other end is in contact with the one surface 11 a of the wiring board 11.
  • the other end of the introduction hole 31 is closed by the support portion 34 and the wiring board 11, and a space communicating with the introduction hole 31 is formed by a part of the one surface 11 a and the inner ring surface of the support portion 34.
  • the pressure sensor 10 and the processing unit 20 are positioned in this space, and the pressure of the fluid to be measured in the introduction hole 31 is applied to the pressure sensor 10 at the other end of the closed introduction hole 31.
  • a part of the space where the pressure sensor 10 and the processing unit 20 are located is filled with a gel-like protection member 36 that protects the pressure sensor 10 and the processing unit 20. Therefore, when the vibration unit 40 is in a non-driven state, the pressure of the fluid to be measured in the detection space 202 is transmitted to the pressure sensor 10 through the introduction hole 31 and the protection member 36. On the other hand, when the vibration unit 40 is in a driving state, a stationary wave is transmitted to the pressure sensor 10 along with the pressure of the fluid to be measured in the detection space 202 through the introduction hole 31 and the protection member 36. The pressure of the fluid to be measured in the detection space 202 usually corresponds to atmospheric pressure. Therefore, when the vibration unit 40 is in a driving state, only a standing wave is substantially transmitted to the pressure sensor 10.
  • the housing 30 has a blade portion 37 connected to the storage portion 33 in addition to the above-described components 31 to 36.
  • Two blade portions 37 are formed in the storage portion 33, and the two blade portions 37 are arranged in the y direction via the storage portion 33.
  • the facing surface 37a of the blade portion 37 facing the inner panel 200 and the facing surface 33a of the storage portion 33 facing the inner panel 200 are flush with each other, and the facing distance between the facing surfaces 33a, 37a and the inner panel 200 is constant. ing.
  • the sealing member 38 has an annular shape in the yz plane, and the length (thickness) in the x direction is constant.
  • a first through hole is formed in each of the two blade portions 37, and a second through hole corresponding to the first through hole is formed in the inner panel 200.
  • Each of the two through holes is arranged in the x direction, and an insertion portion 39 made of a screw, a bolt, a rivet or the like is inserted into each of the two through holes.
  • a material that is higher in rigidity than the resin material constituting the housing 30 for example, the same metal material as the insertion portion 39). ) Is provided.
  • the insertion portion 39 is in direct contact with this collar.
  • the vibrating unit 40 generates a standing wave in the introducing hole 31 by vibrating the fluid to be measured in the introducing hole 31 and applies a pressure generated by the standing wave to the pressure sensor 10.
  • the vibrating part 40 is provided in the introduction hole 31.
  • the vibration part 40 is provided on all the inner walls of the introduction hole 31.
  • the vibration part 40 has the same shape as the inner wall of the introduction hole 31 and is tubular.
  • the processing unit 20 can determine whether or not the introduction hole 31 is blocked by a foreign substance based on the frequency of the electrical signal of the pressure sensor 10. Thereby, when the introduction hole 31 is obstruct
  • the processing unit 20 has a threshold value based on the frequency of the electrical signal output from the pressure sensor 10 when the introduction hole 31 is not completely blocked by foreign matter, and this threshold value is completely blocked by the foreign matter.
  • the frequency is set higher than the frequency of the electrical signal output from the pressure sensor 10 when not.
  • the frequency of the standing wave generated in the introduction hole 31 (resonance frequency) is likely to be different from the resonance frequency of the standing wave in the open state. Therefore, for example, when determining whether or not the introduction hole 31 is closed based on the frequency of the electrical signal of the pressure sensor 10 in the open state, only a part of the introduction hole 31 is closed. Nevertheless, there is a risk of determining that it is in a closed state. Therefore, as described above, the threshold value is determined to be higher than the frequency of the electrical signal output from the pressure sensor 10 when the introduction hole 31 is not completely closed. By doing so, it is possible to suppress erroneous determination of the closed state of the introduction hole 31 compared to the above-described comparative configuration.
  • the vibrating part 40 is provided in the introduction hole 31. According to this, even if a foreign matter adheres in the introduction hole 31, the foreign matter can be removed by the vibration of the vibrating portion 40.
  • the vibrating part 40 is provided on the entire inner wall of the introduction hole 31. According to this, as compared with a configuration in which the vibration part is provided on a part of the inner wall of the introduction hole, the foreign matter attached in the introduction hole 31 can be removed regardless of the attachment location.
  • the configuration in which the vibration part 40 is provided on all the inner walls of the introduction hole 31 is shown.
  • a configuration in which the vibrating portion 40 is provided on a part of the inner wall of the introduction hole 31 may be employed.
  • the vibration part 40 is compared with the structure formed on the other end side of the inner wall of the introduction hole 31. It is suppressed that the vibration (the vibration different from the resonance frequency) having a specific frequency generated at 40 is transmitted to the pressure sensor 10. Therefore, a decrease in accuracy in determining whether one end of the introduction hole 31 is closed by a foreign object is suppressed.
  • by forming the vibrating portion 40 in an annular shape the foreign matter attached to one end of the introduction hole 31 can be reduced in place compared to the configuration in which the vibrating portion is formed in a C shape having a gap. It can be removed independently.
  • the structure of the pressure sensor 10 is not particularly mentioned, but the configuration shown in FIG. 8 can be adopted. That is, it is possible to employ a configuration in which the strain gauge 10c is formed on the membrane 10b whose thickness is locally reduced in the semiconductor substrate 10a.
  • the example in which the vibration part 40 is formed on the inner wall of the introduction hole 31 is shown.
  • a configuration in which the vibration part 40 is formed on the semiconductor substrate 10a may be employed.
  • the piezoelectric element 10e is formed on the membrane 10d having a locally thinned thickness in the semiconductor substrate 10a.
  • a configuration in which a groove 10f is formed between the two is preferable.
  • the configuration in which the vibration unit 40 is provided in the introduction hole 31 is shown.
  • a configuration in which the vibration unit 40 is provided outside the introduction hole 31 may be employed.
  • the vibration unit 40 for example, as schematically illustrated in FIG. 9, a speaker 204 mounted on the vehicle can be employed.
  • the threshold value of the processing unit 20 is set lower than the frequency of the electrical signal output from the pressure sensor 10 in the open state and higher than the frequency of the electrical signal output from the pressure sensor 10 in the closed state.
  • the processing unit 20 determines that the frequency of the electrical signal output from the pressure sensor 10 is equal to or higher than the threshold value, determines that the introduction hole 31 is in an open state, and the electrical signal output from the pressure sensor 10. Is determined to be lower than the threshold, the introduction hole 31 is determined to be in a closed state.
  • the above-described speaker 204 employs a configuration having a sound source that is usually provided in a vehicle that performs music and voice notifications, and a transmission unit that transmits sound output from the sound source to the detected space 202. can do.
  • the speaker 204 may have a dedicated sound source that is different from the sound source normally provided in the vehicle.
  • the sensor device 100 is different from the configuration in which the vibration unit 40 is provided in the housing 30 separately from the speaker provided in the vehicle. An increase in the number of parts is suppressed.
  • the processing unit 20 includes a filter, a measurement unit, and a comparison unit.
  • the processing unit 20 is not limited to the above example.
  • a configuration in which the processing unit 20 includes an F / V conversion circuit and a comparator may be employed.
  • the frequency of the electric signal of the pressure sensor 10 is converted into a voltage by the F / V conversion circuit, and the converted voltage is input to the comparator.
  • a threshold voltage is input to the comparator.
  • This threshold voltage corresponds to the threshold in this modification.
  • a configuration including a Fourier transform unit and a digital processing unit may be employed so that the processing unit 20 performs digital processing.
  • various configurations can be adopted as the configuration for processing the frequency of the electrical signal of the pressure sensor 10.
  • the attached member to which the sensor device 100 is attached and fixed is not limited to the above example, and is appropriately adopted depending on the application.
  • the pressure sensor 10, the wiring substrate 11, the processing unit 20, and the capacitor 12 are electrically connected via the wire 13.
  • a configuration in which the pressure sensor 10, the wiring board 11, the processing unit 20, and the capacitor 12 are electrically connected via solder (not shown) may be employed.
  • the support portion 34 has an annular shape.
  • the shape of the support portion 34 is not limited to the above example.
  • the pressure sensor 10 and the processing unit 20 are each covered and protected by the gel-like protective member 36.
  • the protective member 36 may not be provided.
  • the relationship between the shape of the introduction hole 31 and the standing wave is not specified.
  • the introduction hole 31 according to the present embodiment has an almost constant inner diameter, but is L-shaped and bent in the zx plane. Therefore, when sound is generated in the introduction hole 31, pressure loss occurs due to the bending. However, after all, only a specific frequency according to the shape of the introduction hole 31 is emphasized, and as shown in FIGS. 5 and 6, the introduction hole 31 is not bent. Similarly, a standing wave is generated in the introduction hole 31. Therefore, the shape of the introduction hole 31 can be appropriately adopted as long as one end and the other end communicate with each other.
  • the specific configuration of the vibrating portion 40 provided in the introduction hole 31 is not particularly described in detail.
  • an ultrasonic transducer having a piezoelectric effect can be used as the vibrating unit 40.
  • This ultrasonic transducer is composed of two electrodes and a piezoelectric material provided between the electrodes.
  • the two electrodes described above are arranged in the radial direction of the introduction hole 31 through the piezoelectric material, and are formed in a tubular shape following the shape of the inner wall of the introduction hole 31.
  • a flexible piezoelectric material for example, a piezoelectric polymer film can be employed.
  • the piezoelectric polymer film When an electric signal whose amplitude fluctuates from positive to negative at a constant period is input to the piezoelectric polymer film, the piezoelectric polymer film expands and contracts in the radial direction, and a sound corresponding to the frequency of the electric signal is generated from the vibration unit 40 and introduced. A standing wave is generated in the hole 31. Strictly speaking, the piezoelectric polymer film also vibrates in the circumferential direction of the introduction hole 31 when expanding and contracting in the radial direction. Therefore, strictly speaking, the vibrating portion 40 has a tube shape having a gap as play for vibrating in the circumferential direction.
  • the input of the electric signal for generating this standing wave to the vibration part 40 is performed when the introduction hole 31 is inspected.
  • the process part 20 may have a production

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  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biomedical Technology (AREA)
  • Mechanical Engineering (AREA)
  • Measuring Fluid Pressure (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

L'invention porte sur un dispositif capteur qui comprend un capteur de pression (10), une unité de traitement (20), un boîtier (30), dans lequel est formé un trou d'entrée (31) servant à guider un fluide à mesurer jusqu'au capteur de pression, et une unité de vibration (40, 204), destinée à générer dans le trou d'entrée une onde stationnaire ayant une fréquence de résonance déterminée par la forme et l'état du trou d'entrée, en faisant vibrer le fluide à mesurer dans le trou d'entrée. Une première extrémité du trou d'entrée est ouverte et l'autre extrémité est fermée. A l'extrémité fermée du trou d'entrée, le capteur de pression est placé dans le boîtier de manière à pouvoir détecter la pression du fluide à mesurer dans le trou d'entrée. Lorsque l'onde stationnaire est générée dans le trou d'entrée par l'unité de vibration, le capteur de pression émet un signal électrique dont l'amplitude varie périodiquement et qui correspond à la fréquence de résonance. Sur la base de la fréquence du signal électrique de capteur de pression correspondant à la fréquence de résonance, l'unité de traitement détermine si le trou d'entrée a été bloqué par une matière étrangère.
PCT/JP2014/002589 2013-05-20 2014-05-16 Dispositif capteur WO2014188688A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112014002479.1T DE112014002479B4 (de) 2013-05-20 2014-05-16 Sensorvorrichtung

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JP2013106021 2013-05-20
JP2013-106021 2013-05-20
JP2014095614A JP5867542B2 (ja) 2013-05-20 2014-05-06 センサ装置
JP2014-095614 2014-05-06

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WO2014188688A1 true WO2014188688A1 (fr) 2014-11-27

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WO (1) WO2014188688A1 (fr)

Families Citing this family (2)

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Publication number Priority date Publication date Assignee Title
JP7115210B2 (ja) * 2018-10-17 2022-08-09 トヨタ自動車株式会社 燃料供給制御装置
EP3767266B1 (fr) * 2019-07-15 2022-10-05 VEGA Grieshaber KG Système de transmetteur de pression ou convertisseur de mesure de pression à essai automatique intégré

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