JPH11183218A - Heating resistor-type airflow rate measuring device - Google Patents
Heating resistor-type airflow rate measuring deviceInfo
- Publication number
- JPH11183218A JPH11183218A JP9347551A JP34755197A JPH11183218A JP H11183218 A JPH11183218 A JP H11183218A JP 9347551 A JP9347551 A JP 9347551A JP 34755197 A JP34755197 A JP 34755197A JP H11183218 A JPH11183218 A JP H11183218A
- Authority
- JP
- Japan
- Prior art keywords
- heating resistor
- air passage
- supporting
- air flow
- air
- 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.)
- Pending
Links
Landscapes
- Measuring Volume Flow (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、内燃機関の吸入空
気流量を測定する空気流量測定装置に係わり、特に自動
車のエンジンに吸入される空気流量を測定する発熱抵抗
体式空気流量測定装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air flow measuring device for measuring an intake air flow of an internal combustion engine, and more particularly to a heating resistor type air flow measuring device for measuring an air flow taken into an automobile engine.
【０００２】[0002]
【従来の技術】従来の技術には、特願平6−27683号出願
（参照）の発熱抵抗体の支持体の断面形状を八角形にし
たものがある。しかし、上記構造では副空気通路入口上
流部より生じた偏流等の空気乱れの影響による出力ノイ
ズは十分に低減できるものとはなっていなかった。2. Description of the Related Art As a prior art, there is a heating resistor disclosed in Japanese Patent Application No. 6-27683 (see Japanese Patent Application No. Hei 6-27683) in which a support has an octagonal cross section. However, in the above structure, the output noise due to the influence of air turbulence such as a drift generated from the upstream portion of the sub air passage inlet has not been sufficiently reduced.
【０００３】[0003]
【発明が解決しようとする課題】多種のエンジン吸気系
により副空気通路入り口上流部には様々な偏流を生じ
る。空気流量測定装置は、空気の流れを検出するために
副空気通路入り口上流部の偏流や空気の乱れにより出力
ノイズ悪化の原因となっている。The various types of engine intake systems cause various drifts upstream of the entrance of the sub air passage. The air flow measuring device causes output noise to deteriorate due to drift or air turbulence upstream of the sub air passage entrance to detect the flow of air.
【０００４】本発明では、副空気通路入口上流部にて生
じた偏流や空気の乱れによる発熱抵抗体部の流速低下を
抑えることにより出力ノイズ計測精度を十分に維持可能
とすることを目的とするものである。SUMMARY OF THE INVENTION It is an object of the present invention to sufficiently maintain output noise measurement accuracy by suppressing a flow velocity decrease in a heating resistor portion due to a drift or air turbulence generated at an upstream portion of a sub air passage entrance. Things.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に、副空気通路内に配置された発熱抵抗体を支持する支
持体の一方を発熱抵抗体上流にオフセットした位置に設
けた。上記構造にすると副空気通路内に配置されている
発熱抵抗体に対して空気が流れる副空気通路面積が見か
けじょう減少する。言換えれば、発熱抵抗体に対して空
気が収縮されて流れてくる。つまり、副空気通路入口よ
り入ってきた空気は、発熱抵抗体上流にオフセットした
位置に設けた支持体の一方により剥離などにより空気の
乱れを生じる。In order to solve the above-mentioned problems, one of the supports for supporting the heating resistor disposed in the auxiliary air passage is provided at a position offset upstream of the heating resistor. With the above structure, the area of the sub air passage through which air flows to the heating resistor disposed in the sub air passage is apparently reduced. In other words, the air contracts and flows to the heating resistor. That is, the air entering from the sub air passage entrance causes air turbulence due to separation or the like by one of the supports provided at a position offset upstream of the heating resistor.
【０００６】しかし、ここで生じた空気の乱れは発熱抵
抗体に影響しない程度に支持体がオフセットされている
ことにより、発熱抵抗体部の流速を増加し発熱抵抗体部
の空気流れを安定化し副空気通路入口上流部にて生じた
偏流や空気の乱れによる発熱抵抗体の流速低下を防ぎ出
力ノイズの低減を図ったものである。However, the support is offset to such an extent that the generated air turbulence does not affect the heating resistor, thereby increasing the flow velocity of the heating resistor and stabilizing the air flow in the heating resistor. This is to prevent the flow velocity of the heating resistor from decreasing due to the drift and the turbulence of the air generated at the upstream portion of the sub air passage entrance, thereby reducing the output noise.
【０００７】[0007]
【発明の実施の形態】本発明の実施例を図１〜図４によ
り説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.
【０００８】図１は本発明の一実施例を示す空気流量測
定装置の上流からみた外観図である。図２は図１の断面
Ａ−Ａ図である。FIG. 1 is an external view of an air flow measuring device according to an embodiment of the present invention as viewed from the upstream side. FIG. 2 is a sectional AA view of FIG.
【０００９】副空気通路２の中には発熱抵抗体４及び吸
入空気温度を検出する感温抵抗体５が配置されており、
発熱抵抗体及び感温抵抗体は各々の支持部６ａ，６ｂを
介し駆動回路を内蔵するモジュール７と電気的に接続さ
れている。又、副空気通路は空気流量計の回路モジュー
ルと一体化されており、主空気通路１を形成する空気流
量計ボディ３の中に配置されている。更に、発熱抵抗体
支持部６ａの一方は、発熱抵抗体上流にオフセットした
位置に設けられている。A heating resistor 4 and a temperature-sensitive resistor 5 for detecting the intake air temperature are arranged in the sub air passage 2.
The heat-generating resistor and the temperature-sensitive resistor are electrically connected to a module 7 having a built-in drive circuit via respective supporting portions 6a and 6b. The sub air passage is integrated with the circuit module of the air flow meter, and is disposed in the air flow meter body 3 forming the main air passage 1. Further, one of the heating resistor support portions 6a is provided at a position offset upstream of the heating resistor.
【００１０】上記構造によれば、副空気通路より流れて
きた空気流れ８は、発熱抵抗体部が空気流れを感知する
前に発熱抵抗体支持部に接触する。そして、発熱抵抗体
支持部に接触した接触抵抗により剥離などの空気の乱れ
を生じる。また、発熱抵抗体は発熱抵抗体支持部の接触
抵抗により生じた空気乱れの影響を受けない位置にオフ
セットされているために、空気流れは、発熱抵抗体支持
部の接触抵抗により生じた空気乱れにより発熱抵抗体に
収縮して流れる。その結果、発熱抵抗体部の流速を増加
し発熱抵抗体部の空気流れを安定化し副空気通路入口上
流部にて生じた偏流や空気の乱れによる発熱抵抗体の流
速低下を防ぎ出力ノイズの低減ができる。According to the above structure, the airflow 8 flowing from the auxiliary air passage contacts the heating resistor support before the heating resistor detects the airflow. Then, air turbulence such as separation occurs due to contact resistance in contact with the heating resistor support portion. Also, since the heating resistor is offset to a position not affected by the air turbulence caused by the contact resistance of the heating resistor support, the air flow is caused by the air turbulence caused by the contact resistance of the heating resistor support. As a result, the heat shrinks and flows to the heating resistor. As a result, the flow velocity of the heating resistor section is increased, the air flow of the heating resistor section is stabilized, and the flow velocity of the heating resistor is prevented from lowering due to drift or air turbulence generated at the upstream of the sub air passage entrance, thereby reducing output noise. Can be.
【００１１】図３は、本発明の一実施例を示す空気流量
測定装置の横断面図である。図４は、図３の断面Ｂ−Ｂ
図である。本構造の発熱抵抗体支持体は、発熱抵抗体と
水平な位置関係にあり発熱抵抗体支持体の一方が発熱抵
抗体上流にオフセットした位置に設けられている。本構
造によれば、図１に示した実施例と同様の作用効果が望
めながら、発熱抵抗体と発熱抵抗体支持部が水平な位置
関係にあるため副空気通路をコンパクトにすることがで
きる。FIG. 3 is a cross-sectional view of an air flow measuring device showing one embodiment of the present invention. FIG. 4 is a sectional view taken along line BB of FIG.
FIG. The heating resistor support of the present structure has a horizontal positional relationship with the heating resistor, and is provided at a position where one of the heating resistor supports is offset upstream of the heating resistor. According to this structure, while the same operational effects as those of the embodiment shown in FIG. 1 can be expected, the auxiliary air passage can be made compact because the heating resistor and the heating resistor support are in a horizontal positional relationship.
【００１２】[0012]
【発明の効果】本発明は、副空気通路内に設置されてい
る発熱抵抗体部の流速を早め発熱抵抗体部の流量安定化
を可能とした。そのため出力ノイズを低減することがで
きる。According to the present invention, the flow velocity of the heating resistor provided in the auxiliary air passage is increased, and the flow rate of the heating resistor can be stabilized. Therefore, output noise can be reduced.
【図１】本発明の一実施例である空気流量測定装置の上
流から見た外観図。FIG. 1 is an external view of an air flow measuring device according to an embodiment of the present invention as viewed from upstream.
【図２】図１のＡ−Ａ線断面図。FIG. 2 is a sectional view taken along line AA of FIG.
【図３】本発明の一実施例である空気流量測定装置の横
断面図。FIG. 3 is a cross-sectional view of an air flow measuring device according to one embodiment of the present invention.
【図４】図３のＢ−Ｂ線断面図。FIG. 4 is a sectional view taken along line BB of FIG. 3;
１…主空気通路、２…副空気通路、３…空気流量計ボデ
ィ、４…発熱抵抗体、５…感温抵抗体、６ａ…発熱抵抗
体支持部、６ｂ…感温抵抗体支持部、７…モジュール、
８…空気流れ。DESCRIPTION OF SYMBOLS 1 ... Main air passage, 2 ... Sub air passage, 3 ... Air flow meter body, 4 ... Heating resistor, 5 ... Temperature sensitive resistor, 6a ... Heating resistor support, 6b ... Temperature sensitive resistor support, 7 …module,
8 ... Air flow.
Claims (2)
に、内部に吸入空気への放熱量を基に空気流量を測定す
る発熱抵抗体及び発熱抵抗体を支持する支持体を備えた
副空気通路を、前記吸気管路の主空気通路に配置した発
熱抵抗体式空気流量測定装置において、前記副空気通路
内部に設置されている発熱抵抗体を支持する支持体の一
方は、発熱抵抗体上流にオフセットした位置であること
を特徴とする発熱抵抗体式空気流量測定装置。An auxiliary air having therein a heating resistor for measuring an air flow rate based on an amount of heat released to the intake air and a support for supporting the heating resistor for measuring an intake air flow rate of the internal combustion engine. In the heating resistor type air flow measurement device in which the passage is arranged in the main air passage of the intake pipe, one of the supports for supporting the heating resistor installed in the sub air passage is located upstream of the heating resistor. A heating resistor type air flow measuring device, characterized in that it is at an offset position.
係にあり支持体の一方が発熱抵抗体上流にオフセットし
た位置であることを特徴とする請求項１記載の発熱抵抗
体式空気流量測定装置。2. A heating resistor type air flow according to claim 1, wherein said support is in a horizontal positional relationship with said heating resistor, and one of said supports is offset upstream of said heating resistor. measuring device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9347551A JPH11183218A (en) | 1997-12-17 | 1997-12-17 | Heating resistor-type airflow rate measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9347551A JPH11183218A (en) | 1997-12-17 | 1997-12-17 | Heating resistor-type airflow rate measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11183218A true JPH11183218A (en) | 1999-07-09 |
Family
ID=18391000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9347551A Pending JPH11183218A (en) | 1997-12-17 | 1997-12-17 | Heating resistor-type airflow rate measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11183218A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007113978A (en) * | 2005-10-19 | 2007-05-10 | Hitachi Ltd | Heating resistor type air flow measuring instrument |
| JP2008249393A (en) * | 2007-03-29 | 2008-10-16 | Denso Corp | Air flow rate measuring device |
-
1997
- 1997-12-17 JP JP9347551A patent/JPH11183218A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007113978A (en) * | 2005-10-19 | 2007-05-10 | Hitachi Ltd | Heating resistor type air flow measuring instrument |
| JP2008249393A (en) * | 2007-03-29 | 2008-10-16 | Denso Corp | Air flow rate measuring device |
| DE102008000864B4 (en) * | 2007-03-29 | 2016-02-25 | Denso Corporation | Flowmeter |
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