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WO2019215978A1 - Dispositif de mesure de quantité physique - Google Patents

Dispositif de mesure de quantité physique Download PDF

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Publication number
WO2019215978A1
WO2019215978A1 PCT/JP2019/005218 JP2019005218W WO2019215978A1 WO 2019215978 A1 WO2019215978 A1 WO 2019215978A1 JP 2019005218 W JP2019005218 W JP 2019005218W WO 2019215978 A1 WO2019215978 A1 WO 2019215978A1
Authority
WO
WIPO (PCT)
Prior art keywords
measurement chamber
physical quantity
quantity measuring
air
measuring device
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2019/005218
Other languages
English (en)
Japanese (ja)
Inventor
丈夫 細川
安藤　亮
貴成 秋元
洋 小貫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Astemo Ltd
Original Assignee
Hitachi Automotive Systems Ltd
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 Hitachi Automotive Systems Ltd filed Critical Hitachi Automotive Systems Ltd
Publication of WO2019215978A1 publication Critical patent/WO2019215978A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G01L19/14—Housings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/14—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature
    • G01N27/18—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by changes in the thermal conductivity of a surrounding material to be tested
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance

Definitions

  • the present invention relates to a physical quantity measuring device.
  • an electronically controlled fuel injection system is adopted, and a physical quantity measuring device for measuring various physical quantities is arranged in the engine room.
  • a humidity sensor is used as a sensor for fuel control.
  • the humidity sensor described in Patent Document 1 is disposed in an intake passage through which intake air flows, and generates a signal corresponding to the humidity of the intake air flowing through the intake passage.
  • the intake passage has a throttle that reduces the cross-sectional area of the flow path, and the humidity sensor is disposed in this throttle.
  • the humidity sensor of Patent Document 1 increases the flow rate of the intake air by suppressing the retention of the intake air in the vicinity of the humidity sensor by increasing the responsiveness of the humidity sensor by disposing the humidity sensor in the diaphragm. .
  • Patent Document 1 since the flow velocity of the intake air in the vicinity of the humidity sensor is increased, there is a possibility that the air flow may affect the detection signal of the humidity sensor as noise. For this reason, there existed a subject which cannot perform highly accurate humidity measurement by the influence of the noise accompanying an air flow.
  • a physical quantity measuring device includes an introduction pipe for introducing a medium to be measured, a first measurement chamber in which a pressure sensor is mounted, and a second measurement chamber in which a humidity sensor is mounted, and the introduction pipe And the first measurement chamber communicate with each other, the first measurement chamber communicates with the second measurement chamber, and the second measurement chamber is disposed offset from the opening of the introduction pipe.
  • the volume of the second measurement chamber is smaller than that of the first measurement chamber, and the pressure sensor and the second measurement chamber are disposed between the first measurement chamber and the second measurement chamber. Steps are formed on both sides in the vertical direction between the humidity sensors.
  • FIG. 1 is a top view of the physical quantity measuring device 1.
  • FIG. 1 shows a surface on which a humidity sensor and a pressure sensor are mounted for easy understanding of the internal configuration.
  • FIG. 2 is a cross-sectional view showing the AA cross section of FIG. In the following description, the vertical direction is based on the vertical direction on the drawing in FIG. 2 and does not necessarily match the vertical direction in the state where the physical quantity measuring device 1 is mounted.
  • the physical quantity measuring device 1 includes a pressure sensor 5 in a first measurement chamber 5A of a housing 1A and a humidity sensor 4 in a second measurement chamber 4A of the housing 1A.
  • the housing 1 ⁇ / b> A is a resin member having a measurement unit accommodation space 13.
  • the measurement unit accommodation space 13 accommodates the substrate 10 on which the humidity sensor 4 and the pressure sensor 5 are mounted.
  • the humidity sensor 4 and the pressure sensor 5 are mounted on the same surface of the substrate 10, and the humidity sensor 4 is provided in the second measurement chamber 4A and the pressure sensor 5 is provided in the first measurement chamber 5A.
  • the upper surface of the substrate 10 is a circuit chamber 15 in which circuit components are arranged, and the circuit chamber 15 is covered with a sensor cover 16.
  • a connector portion 9 is integrally formed on the housing 1A with a resin that forms the main body of the housing 1A.
  • a plurality of connection terminals 9 a protrude from the circuit chamber 15 in the inner space of the connector portion 9. That is, the connection terminal 9a is provided so as to protrude outward from the inner space (the circuit chamber 15 space) of the housing 1A.
  • the connection terminal 9a is electrically connected to the humidity sensor 4 and the pressure sensor 5 through the substrate 10, and can supply power to the humidity sensor 4 and the pressure sensor 5 and take out detection signals from the humidity sensor 4 and the pressure sensor 5.
  • the measurement unit accommodating space 13 has a configuration in which the first measurement chamber 5A and the second measurement chamber 4A communicate with each other.
  • the pressure sensor 5 is arranged in the first measurement chamber 5A, and the humidity sensor 4 is arranged in the second measurement chamber 4A. Yes.
  • the physical quantity measuring device 1 is fixed to the pipe wall of the intake pipe 11 (see FIG. 3).
  • the side fixed to the pipe wall of the intake pipe 11 is referred to as a base end side or a fixed side, and the intake pipe is connected from the base end side.
  • the side inserted into the air passage (air flow path) in the intake pipe 12 formed inside 11 is called the front end side.
  • the first measurement chamber 5A, the pressure sensor 5, the second measurement chamber 4A, and the humidity sensor 4 of the physical quantity measuring device 1 are disposed on the proximal end side, and the temperature sensor 14 and the introduction member 2 are disposed on the distal end side.
  • the housing 1A is formed with an air introduction pipe 3 extending from the measurement unit accommodating space 13 toward the distal end side.
  • the base end side of the air introduction tube 3 is a substrate 10, and the substrate 10 is configured to block an air passage formed inside the air introduction tube 3. That is, the air introduction tube 3 is provided in a direction perpendicular to the plane of the substrate 10 (the mounting surface of the substrate 10).
  • An introduction member 2 is provided in the inner center on the distal end side of the air introduction tube 3 in a direction perpendicular to the plane of the substrate 10. Further, a temperature sensor 14 is provided at the tip of the introduction member 2. The introduction member 2 and the temperature sensor 14 are fixed to the housing 1A.
  • FIG. 3 is a cross-sectional view of the physical quantity measuring device 1 attached to the intake pipe 11. With reference to this figure, the mechanism which introduces the air which flows through the intake pipe 11 into the measurement part accommodation space 13 of the physical quantity measuring device 1 is demonstrated.
  • the introduction member 2 is disposed on the distal end side of the air introduction pipe 3, and the air flowing through the intake pipe 11 hits the introduction member 2, and actively replaces the air from the one opening 3a or the one opening 3b to the first measurement chamber 5A. . That is, the air hitting the introduction member 2 is introduced from the air introduction pipe 3 into the first measurement chamber 5A on the entire circumference (360 °) in the circumferential direction of the one opening 3a or the one opening 3b. Therefore, it is possible to introduce air regardless of the direction of air flow through the intake pipe 11.
  • the air in the air introduction tube 3 is introduced from the one opening 3a side (tip side) toward the substrate 10 side (base end side) and from the substrate 10 side (base end side) to the one opening 3b side (tip end). There is a flow of discharge toward the side.
  • the part of the air introduction pipe 3 functions as the gas exchange part 7a.
  • the gas exchange unit 7a the air is smoothly exchanged, and the air in the vicinity of the substrate 10 is smoothly exchanged.
  • the air introduction tube 3 and the first measurement chamber 5A communicate with each other
  • the first measurement chamber 5A and the second measurement chamber 4A communicate with each other
  • the center S2 of the second measurement chamber 4A is arranged at a position separated by a distance T. That is, the second measurement chamber 4 ⁇ / b> A is arranged offset from the opening of the air introduction pipe 3. For this reason, air actively flows into the first measurement chamber 5A from the air introduction pipe 3, and a vertical vortex is generated in the vertical direction in the first measurement chamber 5A. Moreover, a horizontal vortex is generated in the horizontal direction in the first measurement chamber 5A.
  • the second measurement chamber 4A since the second measurement chamber 4A has a configuration described in detail below, the second measurement chamber 4A uses the phenomenon that the gas spreads in the space due to the gas concentration difference (in this embodiment, the air humidity difference). 2 Introduce into the measurement chamber 4A. For this reason, the humidity sensor 4 arranged in the second measurement chamber 4A is not affected by the vertical vortex and the horizontal vortex generated in the first measurement chamber 5A.
  • FIG. 4 (a) and 4 (b) are partial enlarged views of the physical quantity measuring device 1
  • FIG. 4 (a) is a top view
  • FIG. 4 (b) is a cross-sectional view.
  • the second measurement chamber 4A has a volume smaller than that of the first measurement chamber 5A. That is, as shown in FIG. 4A, when the width of the first measurement chamber 5A is ⁇ , the width of the second measurement chamber 4A is ⁇ , and the width of the pressure sensor 5 is ⁇ , the width ⁇ of the second measurement chamber 4A. Is configured to be narrower than the width ⁇ of the first measurement chamber 5A, and is provided with a wall that forms a step between the first measurement chamber 5A and the second measurement chamber 4A in the horizontal direction with respect to the plane of the substrate 10.
  • the step is provided in the same shape on both sides in the vertical direction between the mounting of the pressure sensor 5 and the humidity sensor 4, that is, in the direction perpendicular to the direction from the pressure sensor 5 to the humidity sensor 4.
  • the wall of the housing 1A formed by this step prevents the horizontal vortex generated in the first measurement chamber 5A from being transmitted to the second measurement chamber 4A.
  • the size of the step is preferably such that the relationship of ⁇ / ⁇ ⁇ 7/10 and ⁇ ⁇ ⁇ holds.
  • a wall is provided that forms a step between the first measurement chamber 5A and the second measurement chamber 4A in a direction perpendicular to the plane of the substrate 10 (vertical direction).
  • the flow velocity of air can be suppressed in the vicinity of the communication from the first measurement chamber 5A to the second measurement chamber 4A.
  • the humidity sensor 4 is disposed in the back of the second measurement chamber 4A away from the air introduction tube 3, so that the humidity sensor ahead of the communication portion between the first measurement chamber 5A and the second measurement chamber 4A.
  • the air is introduced by utilizing the phenomenon that the gas spreads in the space due to the gas concentration difference (in this embodiment, the air humidity difference).
  • the wall is preferably formed by the housing 1A, but the same effect can be obtained even if the wall is formed by other members.
  • the first measurement chamber 5A and the second measurement chamber 4A are molded during molding by molding with the housing 1A, the manufacturing is not complicated and the manufacturing cost is superior.
  • T ⁇ P / 2 is satisfied, where T is the height of the second measurement chamber 4A and P is the height of the pressure sensor 5.
  • FIG. 5 is a top view of a physical quantity measuring device according to a modification.
  • the step provided in the horizontal direction on the plane of the substrate 10 at the communication portion between the first measurement chamber 5A and the second measurement chamber 4A is the R-shaped portion 2f.
  • Other configurations are the same as those of the above-described embodiment.
  • the R-shaped portion 2f is connected in a smooth R shape from the first measurement chamber 5A to the communication portion with the second measurement chamber 4A, and can further rectify the air flow, and the R-shaped portion is equally distributed on both sides. By arranging in, it is possible to obtain the same effect as the above-described embodiment.
  • the humidity sensor is desired to be a humidity sensor that has few restrictions on the mounting direction and can be mounted in any direction.
  • the mounting direction of the physical quantity measuring device 1 is not limited. That is, the mounting direction of the humidity sensor does not depend on the direction of air flow. Therefore, the humidity sensor of this embodiment has few restrictions with respect to an attachment direction, and is suitable for arrange
  • the humidity sensor 4 is exemplified by a thermal humidity detection element that detects humidity by measuring a change in heat conduction of the measurement medium based on a heat radiation amount of the heating element exposed to the measurement medium.
  • a capacitive humidity detecting element may be used.
  • the physical quantity measuring device 1 includes an air introduction pipe 3 for introducing a medium to be measured, a first measurement chamber 5A in which a pressure sensor 5 is mounted, and a second measurement chamber 4A in which a humidity sensor 4 is mounted.
  • the air introduction tube 3 and the first measurement chamber 5A communicate with each other
  • the first measurement chamber 5A and the second measurement chamber 4A communicate with each other
  • the second measurement chamber 4A is disposed offset from the opening of the air introduction tube 3
  • the volume of the second measurement chamber 4A is smaller than that of the first measurement chamber 5A
  • the pressure sensor 5 is interposed between the first measurement chamber 5A and the second measurement chamber 4A. Steps are formed on both sides in the vertical direction between the humidity sensor 4 and the humidity sensor 4. This makes it possible to perform highly accurate humidity measurement while reducing the influence of noise associated with the air flow.
  • the present invention is not limited to the above-described embodiment, and other forms conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention as long as the characteristics of the present invention are not impaired. . Moreover, it is good also as a structure which combined the above-mentioned embodiment and a modification.
  • SYMBOLS 1 Physical quantity measuring device, 1A ... Housing, 2 ... Introducing member, 2f ... R shape part, 3 ... Air introducing pipe, 3a ... Single opening part, 3b ... Single opening part, 4 ... Humidity sensor, 4A ... 2nd measurement chamber DESCRIPTION OF SYMBOLS 5 ... Pressure sensor, 5A ... 1st measurement chamber, 7a ... Gas exchange part, 9 ... Connector part, 9a ... Connection terminal, 10 ... Substrate, 11 ... Intake pipe, 12 ... Intake pipe, 13 ... Measurement part accommodation space, 15 ... Circuit room, 16 ... Sensor cover

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  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Electrochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Measuring Fluid Pressure (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

Il existe un problème selon lequel l'influence du bruit associé à un écoulement d'air empêche de réaliser une mesure d'humidité à haute précision. L'air provenant d'un tuyau d'entrée d'air 3 s'écoule vigoureusement dans une première chambre de mesure 5A et génère un tourbillon longitudinal dans la direction verticale à l'intérieur de la première chambre de mesure 5A. En outre, un tourbillon transversal est également généré dans la direction horizontale à l'intérieur de la première chambre de mesure 5A. Parallèlement, en tirant parti d'un phénomène selon lequel le gaz se diffuse dans l'espace en raison de différences de concentration de gaz, de l'air est introduit dans une seconde chambre de mesure 4A. Grâce à cette configuration, un capteur d'humidité 4 disposé à l'intérieur de la seconde chambre de mesure 4A ne subit pas l'influence du tourbillon longitudinal et du tourbillon transversal générés à l'intérieur de la première chambre de mesure 5A.
PCT/JP2019/005218 2018-05-11 2019-02-14 Dispositif de mesure de quantité physique Ceased WO2019215978A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-092010 2018-05-11
JP2018092010A JP2021139622A (ja) 2018-05-11 2018-05-11 物理量計測装置

Publications (1)

Publication Number Publication Date
WO2019215978A1 true WO2019215978A1 (fr) 2019-11-14

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PCT/JP2019/005218 Ceased WO2019215978A1 (fr) 2018-05-11 2019-02-14 Dispositif de mesure de quantité physique

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WO (1) WO2019215978A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103743437A (zh) * 2013-12-30 2014-04-23 无锡盛邦电子有限公司 温湿度传感器
JP2016011868A (ja) * 2014-06-27 2016-01-21 株式会社デンソー 空気流量測定装置
WO2016017301A1 (fr) * 2014-07-30 2016-02-04 日立オートモティブシステムズ株式会社 Dispositif de détection de quantité physique
JP2016031341A (ja) * 2014-07-30 2016-03-07 日立オートモティブシステムズ株式会社 物理量検出装置
WO2017203860A1 (fr) * 2016-05-23 2017-11-30 日立オートモティブシステムズ株式会社 Appareil de mesure d'humidité

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103743437A (zh) * 2013-12-30 2014-04-23 无锡盛邦电子有限公司 温湿度传感器
JP2016011868A (ja) * 2014-06-27 2016-01-21 株式会社デンソー 空気流量測定装置
WO2016017301A1 (fr) * 2014-07-30 2016-02-04 日立オートモティブシステムズ株式会社 Dispositif de détection de quantité physique
JP2016031341A (ja) * 2014-07-30 2016-03-07 日立オートモティブシステムズ株式会社 物理量検出装置
WO2017203860A1 (fr) * 2016-05-23 2017-11-30 日立オートモティブシステムズ株式会社 Appareil de mesure d'humidité

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