JPH1123336A - Heating resistor type apparatus for measuring air flow rate - Google Patents
Heating resistor type apparatus for measuring air flow rateInfo
- Publication number
- JPH1123336A JPH1123336A JP9173499A JP17349997A JPH1123336A JP H1123336 A JPH1123336 A JP H1123336A JP 9173499 A JP9173499 A JP 9173499A JP 17349997 A JP17349997 A JP 17349997A JP H1123336 A JPH1123336 A JP H1123336A
- Authority
- JP
- Japan
- Prior art keywords
- sub
- air path
- air passage
- heating resistor
- 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.)
- Granted
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、特公平4−34686号公報
のように副空気通路を迂回通路にした空気流量測定装置
がある。これは特に脈動流の影響による発熱抵抗体式空
気流量測定装置の測定誤差（例えば逆流影響）の低減を
図ることを目的としたものである。2. Description of the Related Art As a prior art, there is an air flow measuring device in which a sub air passage is a bypass passage as disclosed in Japanese Patent Publication No. 4-34686. This is intended to reduce the measurement error (for example, the influence of the backflow) of the heating resistor type air flow measurement device due to the influence of the pulsating flow.
【０００３】[0003]
【発明が解決しようとする課題】上記通路構造では曲が
り部による管路抵抗等により発熱抵抗体が検知する流速
が低下してしまい、特にアイドル付近の流速が遅くなっ
てしまい発熱抵抗体の検出精度が悪化してしまう問題が
あった。In the above-mentioned passage structure, the flow velocity detected by the heating resistor decreases due to the pipe resistance or the like due to the bent portion, and the flow velocity particularly near idle becomes slow, and the detection accuracy of the heating resistor decreases. There was a problem that was worse.
【０００４】本発明は、副空気通路に設置した発熱抵抗
体部の流速低下を防ぎ、特に発熱抵抗体部の流速低下で
問題となるエンジンのアイドル回転数付近における計測
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。The present invention can prevent a decrease in the flow velocity of the heating resistor provided in the auxiliary air passage, and can sufficiently maintain the measurement accuracy near the idling speed of the engine, which is a problem particularly due to the decrease in the flow velocity of the heating resistor. It is intended to do so.
【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、副空気通路の出入り口間に穴を設け、穴口の圧力差
によって設けた穴より空気を流し副空気通路内発熱抵抗
体部の流速の増加を図った。In order to solve the above-mentioned problems, a hole is provided between the entrance and exit of the sub air passage, air flows from the hole provided by the pressure difference between the holes, and the flow velocity of the heating resistor portion in the sub air passage is increased. To increase.
【０００６】具体的な例では、副空気通路内に設置され
ている発熱抵抗体下流の副空気通路の内外側の流速を比
較した時に（副空気通路内側流速)＜(副空気通路外側流
速）という関係が成立する場所、つまり静圧の関係が
（副空気通路内側静圧）＞（副空気通路外側静圧）とい
う関係になる場所に、そしてその圧力差により空気流量
が流れ出る穴を副空気通路出入り口間に設ける。もしく
は、副空気通路内に設置されている発熱抵抗体下流と副
空気通路出口間において剥離渦のある通路と剥離渦の無
い通路の通路同士を連通した穴を副空気通路に設ける。In a specific example, when comparing the flow rates inside and outside the sub air passage downstream of the heating resistor provided in the sub air passage, (flow velocity inside the sub air passage) <(flow velocity outside the sub air passage) Where the relation of (static air pressure inside the auxiliary air passage)> (static air pressure outside the auxiliary air passage) is satisfied, and the hole through which the air flow rate flows due to the pressure difference Provided between the passage entrance and exit. Alternatively, a hole is provided in the sub air passage between the downstream of the heating resistor and the outlet of the sub air passage, which is provided in the sub air passage, and connects the passage having the separation vortex and the passage having no separation vortex.
【０００７】[0007]
【発明の実施の形態】本発明の実施例を図１〜図８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
定装置を上流から見た外観図である。また、図２は図１
のＡ−Ａ断面、図３は図２のＢ−Ｂ断面拡大図である。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. FIG. 2 shows FIG.
3 is an enlarged cross-sectional view taken along the line BB 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支持部６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７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、発熱抵抗体と副空気通路
出口間の副空気通路の主空気流れ方向とほぼ平行な壁面
には、副空気通路と主空気通路を連結する穴８を設けて
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 a support portion 6. or,
The sub air passage is integrated with the circuit module 7 of the air flow meter, and the air flow meter body 3 forming the main air passage 1 is formed.
Is located inside. Further, a hole 8 for connecting the sub air passage and the main air passage is provided on a wall surface of the sub air passage between the heating resistor and the sub air passage outlet which is substantially parallel to the main air flow direction.
【００１０】ここで、穴付近の副空気通路と主空気通路
の流速を比較した時には、図３に示すように副空気通路
の流速９より主空気通路の流速１０の方が速く、穴８の
両口には副空気通路の方が、主空気通路より大きい静圧
差を生じる。もしくは、設けた穴付近の主空気通路側に
は副空気通路によって発生し発達した剥離渦が存在して
いる。Here, when comparing the flow velocity of the sub air passage near the hole with that of the main air passage, the flow velocity 10 of the main air passage is faster than the flow velocity 9 of the sub air passage as shown in FIG. The auxiliary air passages at both ports generate a static pressure difference larger than the main air passages. Alternatively, a separation vortex generated and developed by the sub air passage exists on the side of the main air passage near the hole provided.
【００１１】ここで生じた圧力差より副空気通路から主
空気通路へ空気１１が流れ出る。従って、副空気通路内
に設置されている発熱抵抗体部の流速は、副空気通路を
流れ路流速９と穴８を流れる流速１１の合計流速１２と
なるため流速増加が図れる。図４は本発明の他の一実施
例を示す空気流量測定装置を上流から見た外観図であ
る。また図５は図３のＣ−Ｃ断面、図６は図５の拡大図
である。本構造の副空気通路２はしきり壁１３を介し
て、ほぼＵ字形に迂回した副空気通路である。The air 11 flows out of the sub air passage to the main air passage from the pressure difference generated here. Accordingly, the flow velocity of the heating resistor portion provided in the sub air passage is the total flow velocity 12 of the flow velocity 9 and the flow velocity 11 flowing through the hole 8 in the sub air passage, so that the flow velocity can be increased. FIG. 4 is an external view of an air flow measuring device showing another embodiment of the present invention as viewed from upstream. 5 is a cross-sectional view taken along the line CC of FIG. 3, and FIG. 6 is an enlarged view of FIG. The sub-air passage 2 of this structure is a sub-air passage that is detoured in a substantially U-shape through the partition wall 13.
【００１２】副空気通路に設置されている発熱抵抗体の
下流と副空気通路出口間の副空気通路しきり壁１３に副
空気通路同士を連結する穴８Ｂが設けられている。ここ
で、迂回した副空気通路側の穴口付近には、図６に示す
ように副空気通路内を迂回した際に副空気通路しきり壁
により剥離域１４が発生する。剥離渦の中心付近は、他
の部分と比べて圧力が低くなるため、穴８Ｂにおいて
は、剥離渦に向って空気１１が流れる。A hole 8B for connecting the sub air passages is provided in the sub air passage partition wall 13 between the downstream side of the heating resistor provided in the sub air passage and the outlet of the sub air passage. Here, as shown in FIG. 6, a separation area 14 is formed near the hole on the side of the bypassed sub-air passage due to the sub-air passage partition wall when bypassing the inside of the sub-air passage. Since the pressure near the center of the separation vortex is lower than that of other parts, the air 11 flows toward the separation vortex in the hole 8B.
【００１３】従って、このように迂回した管路抵抗の大
きい副空気通路であっても上記通路構造によれば発熱抵
抗体部の流速低下を防ぐことが出来る。また、仮に穴８
Ｂの穴口付近に、剥離域１４が存在していなくても図１
で示した実施例と同様の作用効果を得る事が出来る。Therefore, even with the bypass air passage having a large pipe resistance, the flow path structure can prevent the flow rate of the heating resistor from lowering. Also, if the hole 8
Even if the peeling area 14 does not exist near the hole B in FIG.
The same operation and effect as those of the embodiment shown in FIG.
【００１４】図７は本発明の副空気通路構造を有した発
熱抵抗体式空気流量測定装置を、エンジン吸入空気量を
コントロールするバルブ１５を有するスルットルボディ
１６に装着した一実施例である。又、図８は図７と同様
に本発明の副空気通路を有した発熱抵抗体式空気流量測
定装置をエアクリーナに装着した実施例である。FIG. 7 shows an embodiment in which the heating resistor type air flow measuring device having the auxiliary air passage structure of the present invention is mounted on a throttle body 16 having a valve 15 for controlling an engine intake air amount. FIG. 8 shows an embodiment in which a heating resistor type air flow measuring device having a sub air passage according to the present invention is mounted on an air cleaner as in FIG.
【００１５】エアクリーナは吸入空気量を取り込むため
の導入ダクトを有する上流側ケース部材１７と、吸入空
気量をエンジンルームへ導入するダクトを有する下流側
ケース部材１８で、空気中のダクトを除去するためのフ
ィルタ部材１９を挟み込んで固定する構造である。The air cleaner has an upstream case member 17 having an introduction duct for taking in the intake air amount, and a downstream case member 18 having a duct for introducing the intake air amount into the engine room. This is a structure in which the filter member 19 is sandwiched and fixed.
【００１６】[0016]
【発明の効果】本発明は、副空気通路内の流速が低下す
る副空気通路を使用しても、流速の増加を図ることがで
きるため、発熱式空気流量測定装置の計測精度の向上を
図ることが出来る。According to the present invention, the flow velocity can be increased even if a sub air passage having a reduced flow velocity in the sub air passage is used, so that the measurement accuracy of the heating type air flow measuring device is improved. I can do it.
【図１】本発明の一実施例である空気流量測定装置を上
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の実施例の断面図。FIG. 2 is a sectional view of the embodiment of FIG.
【図３】図２の実施例の断面の拡大図。FIG. 3 is an enlarged view of a cross section of the embodiment of FIG. 2;
【図４】本発明の一実施例である空気流量測定装置を上
流から見た外観図。FIG. 4 is an external view of an air flow measuring device according to an embodiment of the present invention as viewed from upstream.
【図５】図３の実施例の断面図。FIG. 5 is a sectional view of the embodiment of FIG. 3;
【図６】図５の実施例の拡大図。FIG. 6 is an enlarged view of the embodiment of FIG. 5;
【図７】本発明の一実施例であるスロットルボディ一体
型空気流量測定装置の横断面図。FIG. 7 is a cross-sectional view of a throttle body-integrated air flow measuring device according to an embodiment of the present invention.
【図８】本発明の一実施例である空気流量測定装置内蔵
型エアクリーナ横断面図。FIG. 8 is a cross-sectional view of an air cleaner with a built-in air flow measuring device according to an embodiment of the present invention.
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、６…支持部、７
…モジュール、８，８Ｂ…穴、９…副空気通路の流速、
１０…主空気通路の流速、１１…流れ出る空気、１２…
合計流速、１３…副空気通路しきり壁、１４…剥離域、
１５…スロットルバルブ、１６…スロットルボディ、１
７…エアクリーナ上流ケース、１８…エアクリーナ下流
ケース、１９…フィルタ。DESCRIPTION OF SYMBOLS 1 ... Main air passage, 2 ... Sub air passage, 3 ... Air flow meter body, 4 ... Heating resistor, 5 ... Temperature sensitive resistor, 6 ... Support part, 7
… Module, 8, 8B… Hole, 9… Flow velocity of sub air passage,
10: velocity of the main air passage, 11: air flowing out, 12:
Total flow velocity, 13: wall separating auxiliary air passage, 14: separation area,
15 ... Throttle valve, 16 ... Throttle body, 1
7 ... air cleaner upstream case, 18 ... air cleaner downstream case, 19 ... filter.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小林 千尋 茨城県ひたちなか市大字高場2520番地 株 式会社日立製作所自動車機器事業部内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Chihiro Kobayashi 2520 No. Odaiba, Hitachinaka City, Ibaraki Prefecture Inside the Automotive Equipment Division of Hitachi, Ltd.
Claims (5)
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、前記副空気通路は少なくても１つ以上の曲がりを
有し、主空気の流れ方向とほぼ平行な副空気通路の壁面
に主空気通路と副空気通路とを連通させる穴を前記発熱
抵抗体下流に設けたことを特徴とする発熱体式空気流量
測定装置。1. An auxiliary air passage provided with a heating resistor for measuring an air flow rate based on a heat release amount to intake air in order to measure an intake air flow rate of an internal combustion engine. In the heating resistor type air flow measuring device arranged in the air passage, the sub air passage has at least one bend, and the main air passage and the wall of the sub air passage substantially parallel to the main air flow direction. A heating element type air flow measuring device, wherein a hole communicating with a sub air passage is provided downstream of the heating resistor.
抗体下流で少なくても１つ以上の曲がりを有し、更に前
記曲がり部前後の副空気通路を連通する穴を前記発熱抵
抗体下流に有していることを特徴とする発熱抵抗体式空
気流量測定装置。2. The heating element according to claim 1, wherein the auxiliary air passage has at least one bend downstream of the heating resistor, and further includes a hole communicating with the sub air passage before and after the bent portion. A heating resistor type air flow measuring device, which is provided downstream.
より発生する副空気通路内の剥離部域に前記穴設けてい
ることを特徴とする空気流量測定装置。3. The air flow measuring device according to claim 2, wherein said hole is provided in a separation area in the sub air passage generated by bending of the sub air passage.
体，温度補償のための感温抵抗体及びこれらを駆動する
回路更に、これらを保持するためのハウジング部材を請
求項１〜３のいずれかに記載の副空気通路と一体化した
ことを特徴とする発熱抵抗体式空気流量測定装置。4. A heating device for detecting at least an air flow rate, a temperature-sensitive resistor for temperature compensation, a circuit for driving them, and a housing member for holding them. A heating resistor type air flow measuring device, which is integrated with the auxiliary air passage described in the above item.
ーナ，スロットルボディ等の外壁に副空気通路部を前記
吸気通路内に挿入する穴を設け、前記吸気通路構成部品
に固定し使用する請求項４に記載の発熱抵抗体式空気流
量測定装置。5. A hole for inserting a sub air passage portion into the intake passage is provided in an outer wall of a part of the intake passage, for example, an air cleaner or a throttle body, and is fixed to the intake passage component. 5. The heating resistor type air flow measuring device according to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17349997A JP3386982B2 (en) | 1997-06-30 | 1997-06-30 | Heating resistor type air flow measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17349997A JP3386982B2 (en) | 1997-06-30 | 1997-06-30 | Heating resistor type air flow measurement device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1123336A true JPH1123336A (en) | 1999-01-29 |
| JP3386982B2 JP3386982B2 (en) | 2003-03-17 |
Family
ID=15961659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17349997A Expired - Lifetime JP3386982B2 (en) | 1997-06-30 | 1997-06-30 | Heating resistor type air flow measurement device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3386982B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006234766A (en) * | 2005-02-28 | 2006-09-07 | Hitachi Ltd | Device for measuring gas flow rate |
| US7228734B2 (en) | 2004-04-28 | 2007-06-12 | Denso Corporation | Air flow rate measuring device having sensing unit |
| US7234349B2 (en) | 2004-04-28 | 2007-06-26 | Denso Corporation | Air flow rate measuring device having bypass passage |
| JP2007298481A (en) * | 2006-05-08 | 2007-11-15 | Hitachi Ltd | Flow measuring instrument |
| JP2008281581A (en) * | 2001-07-18 | 2008-11-20 | Hitachi Ltd | Apparatus for measuring gas flow rate |
-
1997
- 1997-06-30 JP JP17349997A patent/JP3386982B2/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008281581A (en) * | 2001-07-18 | 2008-11-20 | Hitachi Ltd | Apparatus for measuring gas flow rate |
| US7228734B2 (en) | 2004-04-28 | 2007-06-12 | Denso Corporation | Air flow rate measuring device having sensing unit |
| US7234349B2 (en) | 2004-04-28 | 2007-06-26 | Denso Corporation | Air flow rate measuring device having bypass passage |
| CN100357711C (en) * | 2004-04-28 | 2007-12-26 | 株式会社电装 | Air flow rate measuring device having bypass passage |
| CN100414264C (en) * | 2004-04-28 | 2008-08-27 | 株式会社电装 | Air flow rate measuring device having sensing unit |
| DE102005019614B4 (en) * | 2004-04-28 | 2016-02-11 | Denso Corporation | Air flow meter with a bypass passage |
| JP2006234766A (en) * | 2005-02-28 | 2006-09-07 | Hitachi Ltd | Device for measuring gas flow rate |
| JP2007298481A (en) * | 2006-05-08 | 2007-11-15 | Hitachi Ltd | Flow measuring instrument |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3386982B2 (en) | 2003-03-17 |
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