JP4470743B2 - 流量センサ - Google Patents
流量センサ Download PDFInfo
- Publication number
- JP4470743B2 JP4470743B2 JP2005011940A JP2005011940A JP4470743B2 JP 4470743 B2 JP4470743 B2 JP 4470743B2 JP 2005011940 A JP2005011940 A JP 2005011940A JP 2005011940 A JP2005011940 A JP 2005011940A JP 4470743 B2 JP4470743 B2 JP 4470743B2
- Authority
- JP
- Japan
- Prior art keywords
- heating resistor
- resistor
- heating
- bridge circuit
- temperature
- 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.)
- Expired - Fee Related
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/696—Circuits therefor, e.g. constant-current flow meters
- G01F1/698—Feedback or rebalancing circuits, e.g. self heated constant temperature flowmeters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
- G01F1/688—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow using a particular type of heating, cooling or sensing element
- G01F1/69—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow using a particular type of heating, cooling or sensing element of resistive type
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/696—Circuits therefor, e.g. constant-current flow meters
- G01F1/698—Feedback or rebalancing circuits, e.g. self heated constant temperature flowmeters
- G01F1/699—Feedback or rebalancing circuits, e.g. self heated constant temperature flowmeters by control of a separate heating or cooling element
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/72—Devices for measuring pulsing fluid flows
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0414—Air temperature
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Measuring Volume Flow (AREA)
Description
Rt1〜Rt3 測温抵抗体
Vb 電源電圧
R1、R2、R10、R11、R20、R21 抵抗
2 発熱抵抗体Rh1〜Rh4からなるブリッジ回路
3、30、31 差動増幅器
4、40、41 トランジスタ
5a、5b、6a、6b、70、71、80、81 端子
7 演算器
9 ブリッジ回路2、測温抵抗体Rt1及び抵抗R1、R2からなるブリッジ回路
1a、1b、1c 基板
10a、10b、10c メンブレン
Claims (3)
- 気体流体中に設置され、別個に設けられた第1及び第2のメンブレンを有する基板と、
前記基板上に形成され、同一特性の4つの、自身の温度変化にともなって自身の抵抗値が変化する第1の発熱抵抗体と第2の発熱抵抗体と第3の発熱抵抗体と第4の発熱抵抗体とからなり、前記第1の発熱抵抗体と前記第3の発熱抵抗体は前記気体の流れに対して上流側に形成され、前記第2の発熱抵抗体と前記第4の発熱抵抗体は前記気体の流れに対して下流側に形成され、かつ前記第1の発熱抵抗体と前記第2の発熱抵抗体、及び前記第3の発熱抵抗体と前記第4の発熱抵抗体とが、それぞれ前記気体の流れ方向において対向するように形成されている発熱抵抗部と、
前記第1の発熱抵抗体と前記第2の発熱抵抗体が直列に接続され、前記第3の発熱抵抗体と前記第4の発熱抵抗体が直列に接続され、かつ、前記第1の発熱抵抗体と前記第4の発熱抵抗体が電源側及び前記第2の発熱抵抗体と前記第3の発熱抵抗体がアース側にくるように、前記発熱抵抗体の2つの直列回路を並列に接続した、当該第1〜第4の発熱抵抗体で構成される第1のブリッジ回路と、
周辺温度によって自身の抵抗値が変化する測温抵抗体と、所定の抵抗値を有する第1の抵抗体及び第2の抵抗体とを備え、前記第1のブリッジ回路と前記測温抵抗体と前記第1の抵抗体と前記第2の抵抗体とから構成される第2のブリッジ回路であって、平衡したときに前記第1〜第4の発熱抵抗体の温度が前記気体流体中の温度よりも所定温度だけ高くなるように、前記第1の抵抗体と前記第2の抵抗体の抵抗値が調整されている第2のブリッジ回路と、
前記第2のブリッジ回路の中点端子間の電位差をモニターし、当該電位差に基づいて当該第2のブリッジ回路が平衡するように当該第2のブリッジ回路に流す電流を調整する電流調整部と、
前記第1のブリッジ回路の2つの中点端子に接続されており、当該2つの中点端子間の電位差に基づいて、前記気体の流量と流れ方向とを算出する算出部とを備え、
前記発熱抵抗部の前記第1の発熱抵抗体と前記第2の発熱抵抗体とが前記第1のメンブレンに形成され、前記第3の発熱抵抗体と前記第4の発熱抵抗体とが前記第2のメンブレンに形成されることを特徴とする流量センサ。 - 前記測温抵抗体は、前記基板上に形成されていることを特徴とする請求項1に記載の流量センサ。
- 前記4つの発熱抵抗体は、前記基板上に同一の発熱抵抗材料を同一形状に堆積して形成されたものであることを特徴とする請求項1又は2に記載の流量センサ。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005011940A JP4470743B2 (ja) | 2005-01-19 | 2005-01-19 | 流量センサ |
US11/332,352 US7251995B2 (en) | 2005-01-19 | 2006-01-17 | Fluid flow sensor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005011940A JP4470743B2 (ja) | 2005-01-19 | 2005-01-19 | 流量センサ |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2006200991A JP2006200991A (ja) | 2006-08-03 |
JP4470743B2 true JP4470743B2 (ja) | 2010-06-02 |
Family
ID=36682454
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2005011940A Expired - Fee Related JP4470743B2 (ja) | 2005-01-19 | 2005-01-19 | 流量センサ |
Country Status (2)
Country | Link |
---|---|
US (1) | US7251995B2 (ja) |
JP (1) | JP4470743B2 (ja) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4836864B2 (ja) * | 2007-05-16 | 2011-12-14 | 日立オートモティブシステムズ株式会社 | 熱式流量計 |
EP2037234A1 (en) * | 2007-09-14 | 2009-03-18 | General Electric Company | Fluid detector |
JP5492834B2 (ja) * | 2011-07-26 | 2014-05-14 | 日立オートモティブシステムズ株式会社 | 熱式流量計 |
EP2959328A4 (en) * | 2013-02-22 | 2016-10-19 | Vaisala Oyj | RADIO PROBE AND METHOD FOR ATMOSPHERIC MEASUREMENTS AT HIGH TEMPERATURES |
CN103424153B (zh) * | 2013-08-05 | 2016-01-20 | 中国计量学院 | 天然气气体流量的测量装置及测量方法 |
US20160370809A1 (en) * | 2015-06-19 | 2016-12-22 | Hni Technologies Inc. | Fluid flow system |
JP6556217B2 (ja) | 2017-12-20 | 2019-08-07 | 三菱電機株式会社 | 流量検出装置 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4080821A (en) * | 1977-03-28 | 1978-03-28 | Rosemount Engineering Company Limited | Electric circuits |
DE2906847A1 (de) * | 1979-02-22 | 1980-09-04 | Bosch Gmbh Robert | Einrichtung zum messen des luftdurchsatzes im luftansaugrohr einer brennkraftmaschine |
JPH01185416A (ja) | 1988-01-20 | 1989-07-25 | Mitsubishi Electric Corp | 内燃機関用熱式流量計 |
US5069066A (en) * | 1990-05-10 | 1991-12-03 | Djorup Robert Sonny | Constant temperature anemometer |
JPH0829228A (ja) | 1994-07-13 | 1996-02-02 | Unisia Jecs Corp | 熱式空気流量検出装置 |
JPH0843162A (ja) | 1994-07-28 | 1996-02-16 | Unisia Jecs Corp | 熱式空気流量検出装置 |
DE19542143A1 (de) * | 1995-11-11 | 1997-05-15 | Bosch Gmbh Robert | Vorrichtung zur Bestimmung des Durchsatzes eines strömenden Mediums |
EP1418408B1 (en) * | 2001-08-14 | 2014-07-09 | Hitachi, Ltd. | Thermal flow sensor |
DE10324292B4 (de) * | 2003-05-21 | 2018-03-15 | Robert Bosch Gmbh | Messelement für einen Durchflusssensor, insbesondere einen Luftmassensensor für Brennkraftmaschinen |
-
2005
- 2005-01-19 JP JP2005011940A patent/JP4470743B2/ja not_active Expired - Fee Related
-
2006
- 2006-01-17 US US11/332,352 patent/US7251995B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US20060156807A1 (en) | 2006-07-20 |
US7251995B2 (en) | 2007-08-07 |
JP2006200991A (ja) | 2006-08-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6209402B1 (en) | Measuring element, mass air flow meter therewith and compensating method for accurately measuring air flow | |
JP4470743B2 (ja) | 流量センサ | |
US6935172B2 (en) | Thermal type flow measuring device | |
US7287424B2 (en) | Thermal type flow measurement apparatus having asymmetrical passage for flow rate measurement | |
US7010971B2 (en) | Heating resistor type flow-measuring device having a heating resistor and a thermoresistance, whose resistance value varies in response to the ambient temperature | |
JP2004093189A (ja) | 熱式流量検出装置 | |
JP3758081B2 (ja) | 熱式流量検出装置 | |
US6508117B1 (en) | Thermally balanced mass air flow sensor | |
JP2003106887A (ja) | 流量計測装置 | |
JP2003322658A (ja) | 流速センサ | |
JPH0625684B2 (ja) | 流体の流量検出センサー | |
US20020170352A1 (en) | Flow rate detector | |
JP3293469B2 (ja) | 熱式流速センサ | |
JP5029509B2 (ja) | 流量センサ | |
JP3454265B2 (ja) | 熱式流速センサ | |
JP5178261B2 (ja) | 熱式流量計 | |
JP2004340936A (ja) | 流量センサ | |
JP3577902B2 (ja) | 熱式流速センサ | |
JP2019109190A (ja) | 流量検出装置 | |
JPH11351936A (ja) | 熱式流量センサ及び熱式流量検出回路 | |
JP4089657B2 (ja) | 空気流量センサ | |
JPH0843162A (ja) | 熱式空気流量検出装置 | |
JP2009229092A (ja) | 熱式流量計およびその初期調整方法 | |
JP2000275075A (ja) | 熱式流量センサ | |
JPH08105779A (ja) | 熱式空気流量検出装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20070206 |
|
A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20091113 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20091117 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20100108 |
|
TRDD | Decision of grant or rejection written | ||
A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20100209 |
|
A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 |
|
A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20100222 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130312 Year of fee payment: 3 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130312 Year of fee payment: 3 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140312 Year of fee payment: 4 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
LAPS | Cancellation because of no payment of annual fees |