WO2019073771A1 - Dispositif de mesure d'humidité - Google Patents

Dispositif de mesure d'humidité Download PDF

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Publication number
WO2019073771A1
WO2019073771A1 PCT/JP2018/034733 JP2018034733W WO2019073771A1 WO 2019073771 A1 WO2019073771 A1 WO 2019073771A1 JP 2018034733 W JP2018034733 W JP 2018034733W WO 2019073771 A1 WO2019073771 A1 WO 2019073771A1
Authority
WO
WIPO (PCT)
Prior art keywords
measuring device
introduction
humidity
humidity measuring
inlet opening
Prior art date
Application number
PCT/JP2018/034733
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English (en)
Japanese (ja)
Inventor
丈夫 細川
洋 小貫
安藤　亮
浩昭 星加
Original Assignee
日立オートモティブシステムズ株式会社
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 日立オートモティブシステムズ株式会社 filed Critical 日立オートモティブシステムズ株式会社
Publication of WO2019073771A1 publication Critical patent/WO2019073771A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/02—Details or accessories of testing apparatus
    • 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 detection device suitable for measuring the humidity of intake air in an internal combustion engine.
  • an electronically controlled fuel injection system is adopted, and various sensors and control devices are disposed in an engine room.
  • One of the sensors disposed in the engine room is a humidity measuring device. This humidity measuring device is used for fuel control.
  • Patent Document 1 a humidity measuring device described in JP-A-2015-232514 (Patent Document 1) is known.
  • the humidity measuring device of Patent Document 1 includes a humidity sensor which is disposed in an intake passage through which intake air flows, and generates a signal according to the humidity of the intake air flowing through the intake passage.
  • the intake channel has a throttle which reduces the cross-sectional area of the flow path, and the humidity sensor is arranged at this throttle.
  • the humidity measuring device of Patent Document 1 increases the flow velocity of the intake air by disposing the humidity sensor at the aperture, suppresses the stagnation of the intake air in the vicinity of the humidity sensor, and improves the responsiveness of the humidity sensor. (See summary).
  • Patent Document 2 Japanese Patent Application Laid-Open No. 2003-107033
  • Patent Document 2 describes a gas sensor having a gas sensor element inserted and disposed in a housing.
  • This gas sensor is fixed to the front end side of the housing, and has a measurement-side cover including a cylindrical outer cover and an inner cover having different diameters that share substantially the same central axis.
  • the outer cover and the inner cover each have an outer introduction hole and an inner introduction hole for introducing the gas to be measured into the inner cover from the outside of the outer cover (see the abstract).
  • the humidity measuring device of Patent Document 1 can improve responsiveness. However, since the flow velocity of the intake air near the humidity sensor is increased, the flow of air may affect the detection signal of the humidity sensor as noise. For this reason, there is a possibility that the noise generated by the flow of air may cause a limit in achieving high accuracy of the humidity measuring device.
  • the gas sensor of Patent Document 2 is a sensor that detects an oxygen concentration
  • the gas which has passed through the outer introduction hole and the inner introduction hole formed in the outer cover and the inner cover is a measurement gas in which the gas sensor element is disposed. It flows directly into the chamber. Therefore, when the humidity measuring device is configured with the structure of the gas sensor of Patent Document 2, the gas flowing into the measurement gas chamber flows with a relatively high flow velocity in the vicinity of the gas sensor element. For this reason, the flow of gas may affect as noise to the detection signal of the gas sensor element, and there may be a limit due to the noise generated by the flow of gas in achieving high accuracy of the gas sensor.
  • An object of the present invention is to provide a humidity measuring device capable of performing highly accurate measurement with less noise due to air flow.
  • the introduction pipe for taking in the intake air into the physical quantity detection section and the inlet section of the introduction pipe are the first wall surface and the second wall surface located inside the first wall.
  • the first wall surface portion and the second wall surface portion are provided such that the window of the first wall surface portion and the wall of the second wall surface portion overlap in a direction perpendicular to the introduction direction of the introduction pipe.
  • the second wall portion has a shape in which a wall and a window are alternately formed at a predetermined interval.
  • the vertical direction in the following description is defined on the basis of the vertical direction in FIG. 1B, and does not necessarily coincide with the vertical direction in the state where the humidity measuring device is mounted.
  • FIG. 1A is a schematic view showing the lower surface of the humidity measuring device according to one embodiment of the present invention.
  • FIG. 1B is a schematic view showing an AA cross section of FIG. 1A.
  • the humidity measuring device 1 includes a housing 1A, a humidity detecting element 4, a substrate 10, a measuring chamber 5, an introducing pipe 3, and air introducing portions 8a and 8b. , The introduction guide 2, and the connection terminal 9.
  • the housing 1 ⁇ / b> A is a resin member having a measurement unit housing space 13.
  • a substrate 10 on which the humidity detection element 4 is mounted and a sensor cover 6 covering the humidity detection element 4 are accommodated in the measurement unit accommodation space 13.
  • a recess 6 a is formed in the sensor cover 6, and by combining the sensor cover 6 and the substrate 10, a measurement chamber 5 in which the humidity detection element 4 is accommodated in the recess 6 a is configured. That is, the humidity detection element 4 is disposed in the measurement chamber 5 constituted by the sensor cover 6 and the substrate 10.
  • the housing 1A is fixed to the pipe wall 11 of the intake pipe (see FIG. 2), the side fixed to the intake pipe wall 11 is called the proximal side or the fixed side, and from the proximal side to the inner side of the intake pipe 11.
  • the side to be inserted into the formed air passage (air passage) is called the tip side.
  • the measuring unit housing space 13, the measuring chamber 5, the humidity detecting element 4, the substrate 10, and the sensor cover 6 are configured at the end (proximal end) of the proximal end side of the housing 1A and disposed outside the intake pipe 11. Ru.
  • the 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 project from the measurement portion accommodation space 13. That is, the connection terminal 9a is provided so as to protrude outward from the inner space (measurement portion accommodation space) 13 of the housing 1A.
  • the connection terminal 9 a is electrically connected to the humidity detection element 4 via the substrate 10, and enables power supply to the humidity detection element 4 and extraction of a detection signal from the humidity detection element 4.
  • the power supply and the detection signal will be described as being called an electrical signal.
  • An introduction pipe (air introduction pipe) 3 is formed in the housing 1A so as to extend from the measurement portion accommodation space 13 toward an end (tip end) on the tip end side.
  • a substrate 10 is provided at the end of the proximal end side of the introduction pipe 3, and the substrate 10 blocks most of the cross section of the air passage formed inside the introduction pipe 3.
  • the substrate 10 is provided with air introduction portions (communication passages or communication holes) 8a and 8b, and the air passage of the introduction pipe 3 is in communication with the measurement chamber 5 through the air introduction portions 8a and 8b. That is, the introduction pipe 3 and the air introduction parts 8 a and 8 b constitute an introduction part (air introduction part) for introducing air into the measurement chamber 5.
  • the housing 1A is constituted by two members of a proximal end housing member (first housing member) 1Aa and a distal end housing member (second housing member) 1Ab.
  • the proximal end side member 1Aa is provided with a measurement unit housing space 13, a measurement chamber 5, a humidity detection element 4, a substrate 10, a sensor cover 6, and a part of the proximal end side of the introduction pipe 3.
  • the leading end side member 1Ab is provided with a part of the leading end side of the introducing pipe 3 and an introducing guide (air introducing guide) 2 formed at the leading end of the introducing pipe 3.
  • the introduction guide 2 protrudes from the inlet opening 3a of the introduction pipe 3 to the tip end side and guides the measurement medium with a plurality of first introduction guides (first wall surface portions) 2a and a plurality of second introduction guides (second wall surfaces) Part) 2b.
  • the plurality of second introduction guides 2 b are disposed on the tip end side with respect to the inlet opening 3 a of the introduction pipe 3 and on the radially outer side of the inlet opening 3 a.
  • the plurality of first introduction guides 2a are disposed on the tip end side with respect to the inlet opening 3a of the introduction tube 3 and radially outside the plurality of second introduction guides 2b.
  • the plurality of first introduction guides 2a are arranged radially outward with respect to the plurality of second introduction guides 2b, and the plurality of second introduction guides 2b are arranged radially inward with respect to the plurality of first introduction guides 2a. Will be placed.
  • Each of the plurality of second introduction guide portions 2b is arranged to be separated in the circumferential direction surrounding the inlet opening 3a, and a second circumferential gap (a second window) is formed between two adjacent second introduction guide portions 2b. Part 2d is formed.
  • Each of the plurality of first introduction guide portions 2a is arranged to be separated in the circumferential direction surrounding the inlet opening 3a and the second introduction guide portion 2b, and between the adjacent two first introduction guide portions 2a, the first A circumferential gap (first window) 2c is formed.
  • the introduction guide 2 has a first introduction guide 2a, a second introduction guide 2b, a first window 2c, a second window 2d, and a radial gap 2e.
  • a passage in which air flows from the outer peripheral side of the introduction guide 2 to the inner peripheral side of the introduction guide 2 through the first window 2 c and the second window 2 d is configured.
  • the housing 1A is constituted by two members, but may be constituted by one member or may be divided into three or more members. Since the housing 1A is configured by two members, the part configured by the proximal end housing member 1Aa is made common, and a plurality of types in which the configuration of the part of the introduction guide 2 is changed is configured with a reduced number of parts. Can. Alternatively, the design change of the portion of the introduction guide 2 is facilitated.
  • leading end side housing member 1Ab on the opposite side to the leading end side (the measurement unit accommodation space 13 side) of the introduction pipe 3 and the introduction guide 2 are formed, whereby a plurality of first introduction guide portions 2a And the plurality of second introduction guide portions 2b can be integrally formed parts.
  • FIG. 2 is a schematic view showing a cross section of the humidity measuring device according to one embodiment of the present invention in a state of being attached to an intake pipe.
  • the first window portion 2c and the second window portion 2d are arranged so as not to align in a straight line in the radial direction. That is, the first introduction guide portion (first wall surface portion) 2a includes a first window portion 2c and a second introduction guide portion (second wall surface portion) 2b configured between two adjacent first introduction guide portions 2a. And so as to overlap in the circumferential direction of the inlet opening 3a. Further, in the second introduction guide portion 2b, the second window portion 2d configured between the two adjacent second introduction guide portions 2b and the first introduction guide portion 2a overlap in the circumferential direction of the entrance opening portion 3a. Provided as.
  • the introduction guide 2 prevents air from flowing straight from the outer peripheral side to the inner peripheral side.
  • the first introduction guide portion 2a and the second introduction guide portion 2b of the introduction guide 2 form a labyrinth portion 7a in which the air passage bends in a complicated manner.
  • Q1 and Q2 indicate the flow of air.
  • the air having passed through the labyrinth portion 7a flows into the introduction pipe 3 from the inlet opening 3a as a swirling flow.
  • the air flowing into the introduction pipe 3 flows by swirling so that the flow toward the substrate 10 (base end) and the flow from the substrate 10 toward the inlet opening 3 a (tip) are mixed.
  • the portion of the introduction pipe 3 constitutes a gas exchange unit 7b.
  • the gas exchange unit 7b the air is smoothly exchanged, and the air in the vicinity of the substrate 10 is smoothly exchanged.
  • the air flowing into the introduction pipe 3 flows out of the inlet opening 3 a to the outside of the introduction pipe 3.
  • the inlet opening 3 a constitutes the outlet (outlet opening) of the introduction pipe 3.
  • the introduction pipe 3 and the measurement chamber 5 are separated by the substrate 10, and the measurement chamber 5 is configured to have a diffusion portion 7c. That is, the air flow flowing through the introduction pipe 3 and reaching the substrate 10 is blocked by the substrate 10, and the air on the introduction pipe 3 side reaching the vicinity of the substrate 10 is introduced into the measurement chamber 5 by diffusion through the air introduction portions 8a and 8b. Ru.
  • the substrate 10 constitutes a blocking portion (a blocking wall) that blocks the flow of air flowing through the introduction pipe 3.
  • the substrate 10 constitutes a partition (partition wall) that partitions the introduction pipe 3 and the measurement chamber 5.
  • the substrate 10 has air introducing portions (communication paths) 8 a and 8 b formed in part of the surface facing the inner side of the introducing pipe 3 in order to stop the air flow.
  • air is introduced into the measurement chamber 5 by utilizing the phenomenon that the gas spreads in the space due to the concentration difference of the gas (the humidity difference of the air in the present embodiment).
  • gas exchange in the vicinity of the humidity detecting element 4 is performed by diffusion from the air introducing portions 8a and 8b, and high precision humidity measurement with less noise to the humidity signal due to the flow of air is realized. ing.
  • the humidity detection element 4 an example of a thermal humidity detection element that detects humidity by measuring the change in heat conduction of the measurement medium based on the amount of heat released from the heating element exposed to the measurement medium
  • a capacitive humidity detection element may be used.
  • the introduction guide 2 is disposed on the upstream side of the introduction pipe 3 and is configured to actively exchange air from the inlet opening 3 a to the substrate 10 that divides the introduction pipe 3 and the measurement chamber 5.
  • the first introduction guide 2a, the second introduction guide 2b, the first window 2c, and the second window 2d are uniformly distributed in the circumferential direction of the inlet opening 3a of the introduction tube 3
  • the inlet opening 3a of the introduction pipe 3 is opened inside the introduction guide 2 from any direction perpendicular to the air introduction direction.
  • the air that has hit the introduction guide 2 is introduced into the introduction pipe 3 over the entire circumference (360 °) in the circumferential direction of the inlet opening 3a. Therefore, air can be introduced to the humidity sensor element 4 regardless of the direction of the air flow, and high-speed response can be ensured to the humidity change of the measurement target medium.
  • FIG. 3 is a bottom view schematically showing a modified example in which the configuration of the introduction guide 2 is changed in the humidity measuring device according to the embodiment of the present invention.
  • the introduction guide 2 has a wing-shaped portion 2 f in place of the first introduction guide portion 2 a and the second introduction guide portion 2 b.
  • the other configuration is the same as the above-described embodiment.
  • a plurality of wing-shaped portions 2 f are arranged at intervals in the circumferential direction on the radially outer side of the inlet opening 3 a of the introduction pipe 3.
  • a circumferential gap (window) 2g is formed between two adjacent wing-shaped portions 2f.
  • the wing-shaped portion 2f has a curved shape on the plane of FIG. 3 (on a plane perpendicular to the air introduction direction of the introduction pipe 3), and constitutes a curved flow path 2g.
  • the wing-shaped portion 2 f that is, the curved flow path 2 g applies a turning force to the air flow flowing into the introduction pipe 3.
  • air is introduced into the introduction pipe 3 from the entire circumference of the inlet opening 3a in the same manner as the above-described embodiment by evenly distributing the wing-shaped portions 2f all around the inlet opening 3a. be able to.
  • the first introduction guide portion 2a, the second introduction guide portion 2b, and the wing shaped portion 2f are disposed radially outside the inlet opening 3a of the introduction tube 3, and from the tip end portion (inlet opening 3a) of the introduction tube 3 It is comprised by the projecting part formed so that the side (proximal end side) in which the measurement chamber 5 was provided may project on the opposite side (distal end side).
  • the humidity measuring device In the engine room of automobiles in recent years, restrictions on the mounting layout have been increased due to the increase in the number of mounted parts along with the downsizing and the sophistication. For this reason, it is desirable for the humidity measuring device to be a humidity measuring device that is mounted in a free direction with less restrictions on the mounting direction.
  • the mounting direction of the humidity measuring device 1 since the inflow direction of the air to the introduction pipe 3 for introducing the air into the measurement chamber 5 is not limited, the mounting direction of the humidity measuring device 1 is not limited. That is, the mounting direction of the humidity measuring device does not depend on the air flow direction. Therefore, the humidity measuring device of the present embodiment has few restrictions on the mounting direction and is suitable for being disposed in the engine room of a car.
  • the present invention is not limited to the embodiments described above, but includes various modifications.
  • the embodiments described above are described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations.

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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)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Testing Of Engines (AREA)

Abstract

La présente invention concerne un dispositif de mesure d'humidité capable d'effectuer une mesure d'humidité extrêmement précise avec moins de bruit dû à un flux d'air. Un dispositif de mesure d'humidité (1) selon la présente invention comprend : un élément de détection d'humidité (4); une chambre de mesure (5), dans laquelle l'élément de détection d'humidité (4) est disposé; un tuyau d'introduction (3) pour introduire de l'air vers la chambre de mesure (5); et une section de séparation (10), qui sépare le tuyau d'introduction (3) et la chambre de mesure (5), et qui est pourvue d'un trajet de communication pour faire communiquer le tuyau d'introduction (3) et la chambre de mesure (5) l'un avec l'autre.
PCT/JP2018/034733 2017-10-10 2018-09-20 Dispositif de mesure d'humidité WO2019073771A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017196657A JP2021014987A (ja) 2017-10-10 2017-10-10 湿度測定装置
JP2017-196657 2017-10-10

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WO2019073771A1 true WO2019073771A1 (fr) 2019-04-18

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61152961U (fr) * 1985-03-13 1986-09-22
JP2001073827A (ja) * 1999-09-01 2001-03-21 Unisia Jecs Corp 排気ガスセンサ及びその制御装置
JP2008151735A (ja) * 2006-12-20 2008-07-03 Yamaha Motor Co Ltd ガスセンサおよびそれを備えた空燃比制御装置ならびに輸送機器
US20090064759A1 (en) * 2007-09-10 2009-03-12 Veris Industries, Llc Environmental sensing unit
JP2010151795A (ja) * 2008-11-28 2010-07-08 Hitachi Automotive Systems Ltd 熱式空気流量センサ
JP2012083119A (ja) * 2010-10-07 2012-04-26 Hitachi Automotive Systems Ltd センサの構造
WO2013042458A1 (fr) * 2011-09-20 2013-03-28 日立オートモティブシステムズ株式会社 Dispositif de détection de quantité physique d'air
JP2015004609A (ja) * 2013-06-21 2015-01-08 日立オートモティブシステムズ株式会社 ガスセンサ装置およびガスセンサ装置の取付け構造
JP2015230269A (ja) * 2014-06-06 2015-12-21 株式会社デンソー 湿度検出機能付き空気流量測定装置
WO2017043263A1 (fr) * 2015-09-09 2017-03-16 株式会社村田製作所 Dispositif de détection de concentration de gaz

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61152961U (fr) * 1985-03-13 1986-09-22
JP2001073827A (ja) * 1999-09-01 2001-03-21 Unisia Jecs Corp 排気ガスセンサ及びその制御装置
JP2008151735A (ja) * 2006-12-20 2008-07-03 Yamaha Motor Co Ltd ガスセンサおよびそれを備えた空燃比制御装置ならびに輸送機器
US20090064759A1 (en) * 2007-09-10 2009-03-12 Veris Industries, Llc Environmental sensing unit
JP2010151795A (ja) * 2008-11-28 2010-07-08 Hitachi Automotive Systems Ltd 熱式空気流量センサ
JP2012083119A (ja) * 2010-10-07 2012-04-26 Hitachi Automotive Systems Ltd センサの構造
WO2013042458A1 (fr) * 2011-09-20 2013-03-28 日立オートモティブシステムズ株式会社 Dispositif de détection de quantité physique d'air
JP2015004609A (ja) * 2013-06-21 2015-01-08 日立オートモティブシステムズ株式会社 ガスセンサ装置およびガスセンサ装置の取付け構造
JP2015230269A (ja) * 2014-06-06 2015-12-21 株式会社デンソー 湿度検出機能付き空気流量測定装置
WO2017043263A1 (fr) * 2015-09-09 2017-03-16 株式会社村田製作所 Dispositif de détection de concentration de gaz

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