JP6549235B2 - 空気流量計 - Google Patents
空気流量計 Download PDFInfo
- Publication number
- JP6549235B2 JP6549235B2 JP2017537655A JP2017537655A JP6549235B2 JP 6549235 B2 JP6549235 B2 JP 6549235B2 JP 2017537655 A JP2017537655 A JP 2017537655A JP 2017537655 A JP2017537655 A JP 2017537655A JP 6549235 B2 JP6549235 B2 JP 6549235B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- characteristic
- correction
- flow meter
- air flow
- 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.)
- Active
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
-
- 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
-
- 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
-
- 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
- G01F1/6842—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow with means for influencing the 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
- G01F1/6847—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow where sensing or heating elements are not disturbing the fluid flow, e.g. elements mounted outside the flow duct
-
- 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
-
- 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
- G01F1/6965—Circuits therefor, e.g. constant-current flow meters comprising means to store calibration data for flow signal calculation or correction
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/02—Compensating or correcting for variations in pressure, density or temperature
- G01F15/04—Compensating or correcting for variations in pressure, density or temperature of gases to be measured
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F5/00—Measuring a proportion of the volume flow
Description
最後に、補正後の回路温度センサ19の出力(TLSI)に応じた補正を出力補正マップ37のデータを用いて壁温補正後の流量信号(QA1)を補正し、流量信号を目標値に合わせる。また同時に、補正後の吸気温度センサ3の出力(TA)は、温度信号として出力される。また本補正は、マップによる補正のみでなく、多項式による補正でも対応可能である。多項式による補正のメリットとしては、記憶回路21、ROM29の容量が小さくて済むことであり、容量が小さければチップサイズの縮小が可能となり低コストが出来る。またマップによる補正のメリットとしては、入力に対する補正量の急激な変化に対応可能であり、高精度化が可能となる点である。
Claims (6)
- 出力を補正する演算回路を備えた空気流量計において、
前記演算回路には、前記空気流量計の出力特性の調整要素として空気温度及びセンサモジュール温度を取り入れ、
前記空気温度と前記センサモジュール温度との温度差に応じて出力特性を補正し、かつ、前記空気温度と前記センサモジュール温度との差の絶対値が閾値より小さいときは、補正量を一次特性とした値と比較して補正量を小さくすることを特徴とする空気流量計。 - 請求項1記載の空気流量計において、
前記出力特性の補正量は、変化率が異なる第一の領域と第二の領域を有することを特徴とする空気流量計。 - 請求項2記載の空気流量計において、
前記第一の領域は、前記第二の領域の変化率より小さい変化率であることを特徴とする空気流量計。 - 請求項2または3に記載の空気流量計において、
前記第一の領域は、前記空気温度と前記センサモジュール温度との温度差に対する補正量の変化率がゼロであり、
前記第二の領域の変化率は、1次特性を有していることを特徴とする空気流量計。 - 請求項2または3に記載の空気流量計において、
前記第一の領域は、前記空気温度と前記センサモジュール温度との温度差に対する補正量の変化率が2次特性であり、
前記第二の領域の変化率は、1次特性を有していることを特徴とする空気流量計。 - 請求項2または3に記載の空気流量計において、
前記第一の領域は、前記空気温度と前記センサモジュール温度との温度差に対する補正量の変化率がゼロであり、
前記第二の領域の変化率は、2次特性を有していることを特徴とする空気流量計。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2015169972 | 2015-08-31 | ||
JP2015169972 | 2015-08-31 | ||
PCT/JP2016/071944 WO2017038312A1 (ja) | 2015-08-31 | 2016-07-27 | 空気流量計 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPWO2017038312A1 JPWO2017038312A1 (ja) | 2018-03-22 |
JP6549235B2 true JP6549235B2 (ja) | 2019-07-24 |
Family
ID=58187236
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2017537655A Active JP6549235B2 (ja) | 2015-08-31 | 2016-07-27 | 空気流量計 |
Country Status (5)
Country | Link |
---|---|
US (1) | US10591332B2 (ja) |
EP (1) | EP3346240B1 (ja) |
JP (1) | JP6549235B2 (ja) |
CN (1) | CN107923780B (ja) |
WO (1) | WO2017038312A1 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6843014B2 (ja) | 2017-07-31 | 2021-03-17 | アズビル株式会社 | 熱式流量計および流量補正方法 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6218708U (ja) * | 1985-07-19 | 1987-02-04 | ||
JP2786668B2 (ja) * | 1989-04-21 | 1998-08-13 | 株式会社日立製作所 | 自動車のエンジン制御用センサ |
JPH0814978A (ja) * | 1994-07-05 | 1996-01-19 | Hitachi Ltd | 熱式空気流量計 |
EP0890827A1 (en) * | 1997-07-08 | 1999-01-13 | Hitachi, Ltd. | Thermal type flow measuring instrument and temperature-error correcting apparatus thereof |
DE01918944T1 (de) * | 2000-03-23 | 2004-10-21 | Invensys Systems, Inc., Foxboro | Korrektur für eine zweiphasenströmung in einem digitalen durchflussmesser |
JP2002054964A (ja) * | 2000-08-10 | 2002-02-20 | Mitsui Mining & Smelting Co Ltd | 流量測定方法及び流量計 |
US6904379B1 (en) * | 2000-09-04 | 2005-06-07 | Hitachi, Ltd. | Thermal air flowmeter |
US7716994B2 (en) * | 2006-05-08 | 2010-05-18 | Invensys Systems, Inc. | Single and multiphase fluid measurements using a Coriolis meter and a differential pressure flowmeter |
JP2010216906A (ja) * | 2009-03-16 | 2010-09-30 | Hitachi Automotive Systems Ltd | 自動車用流量計 |
JP5315304B2 (ja) * | 2010-07-30 | 2013-10-16 | 日立オートモティブシステムズ株式会社 | 熱式流量計 |
JP5271997B2 (ja) * | 2010-12-28 | 2013-08-21 | 日立オートモティブシステムズ株式会社 | 吸気温度センサ |
JP5914388B2 (ja) * | 2013-03-05 | 2016-05-11 | 日立オートモティブシステムズ株式会社 | 熱式流体計測装置 |
-
2016
- 2016-07-27 WO PCT/JP2016/071944 patent/WO2017038312A1/ja active Application Filing
- 2016-07-27 CN CN201680049796.7A patent/CN107923780B/zh active Active
- 2016-07-27 JP JP2017537655A patent/JP6549235B2/ja active Active
- 2016-07-27 EP EP16841344.1A patent/EP3346240B1/en active Active
- 2016-07-27 US US15/754,477 patent/US10591332B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
US20180252565A1 (en) | 2018-09-06 |
EP3346240A1 (en) | 2018-07-11 |
WO2017038312A1 (ja) | 2017-03-09 |
US10591332B2 (en) | 2020-03-17 |
EP3346240B1 (en) | 2020-06-24 |
EP3346240A4 (en) | 2019-04-17 |
JPWO2017038312A1 (ja) | 2018-03-22 |
CN107923780A (zh) | 2018-04-17 |
CN107923780B (zh) | 2021-06-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7231312B2 (en) | Physical quantity detecting method and sensor device | |
EP2924405B1 (en) | Intake air temperature sensor and flow measurement device | |
US8874387B2 (en) | Air flow measurement device and air flow correction method | |
JP5900536B2 (ja) | センサ信号検出装置 | |
JP5914388B2 (ja) | 熱式流体計測装置 | |
JP2005106723A (ja) | 熱式流量計及び制御システム | |
WO2002021084A1 (fr) | Debitmetre a air thermique | |
JP5577198B2 (ja) | 気体流量測定装置 | |
JP6549235B2 (ja) | 空気流量計 | |
JPS5877630A (ja) | 温度測定装置 | |
CN111954793B (zh) | 热式流量计 | |
JP3609148B2 (ja) | 発熱抵抗式空気流量計 | |
JP2010216906A (ja) | 自動車用流量計 | |
WO2019239726A1 (ja) | 物理量検出装置 | |
JP6201901B2 (ja) | 空気流量測定装置 | |
JP5120289B2 (ja) | 空気流量測定装置 | |
JP5814884B2 (ja) | 熱式流量測定装置及びこれを用いた制御装置 | |
JP2001174304A (ja) | 演算装置内蔵センサ | |
US10753300B2 (en) | Flow rate detector | |
WO2019221183A1 (ja) | 気体流量測定装置および気体流量測定方法 | |
JP2019066253A (ja) | 流量計測装置 | |
JP5391754B2 (ja) | エアフローメータ |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20171130 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20181204 |
|
A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20190130 |
|
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: 20190611 |
|
A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20190626 |
|
R150 | Certificate of patent or registration of utility model |
Ref document number: 6549235 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |