JPS58132618A - Device for detecting flow rate of intake air for internal combustion engine - Google Patents
Device for detecting flow rate of intake air for internal combustion engineInfo
- Publication number
- JPS58132618A JPS58132618A JP57014938A JP1493882A JPS58132618A JP S58132618 A JPS58132618 A JP S58132618A JP 57014938 A JP57014938 A JP 57014938A JP 1493882 A JP1493882 A JP 1493882A JP S58132618 A JPS58132618 A JP S58132618A
- Authority
- JP
- Japan
- Prior art keywords
- main air
- flow rate
- intake air
- path
- air passage
- 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
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Details Of Flowmeters (AREA)
- Measuring Volume Flow (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は内燃機関用吸入空気流量検出装置に係夛、籍に
熱ＩＩＩｔ用い九空気流量検出装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake air flow rate detection device for an internal combustion engine, and particularly relates to an air flow rate detection device using thermal IIIt.
この種の空気流量検出装置は、゛郷来、主空気通路〈熱
線を備えたもの、あるいはバイパス通路に熱線を備えた
ものが知られている。This type of air flow rate detection device has traditionally been known as having a main air passage with a hot wire or a bypass passage with a hot wire.
しかし、前者は逆火等によｐ熱線が汚れて性能劣化が生
じるという優いかあす、ま九、後者は熱線の汚れは防止
できるとしても、機関の高負荷時に発生する吸気脈動に
より空気流量検出器の出力が上昇し真の空気流量が側御
でき゛な調という欠点があった。However, the former has the disadvantage that the P heating wire becomes dirty due to backfire etc., resulting in performance deterioration.The latter, although it is possible to prevent the heating wire from becoming dirty, the air flow rate is detected due to the intake pulsation that occurs when the engine is under high load. The drawback was that the output of the device increased and the true air flow rate could not be controlled.
本発明の目的は、逆火等による熱線の汚れを防止できる
とともに、吸気脈動時−発生する検出器の出力上昇を解
消した内燃機関用吸入空気流量検出装置を提供するＫあ
る。゛
このような目的を達成する九めに、本発明は、機関の一
気脈動によって発生する流速変動がバイパス空気通路に
作用することを実験的に確認し、バイパス空気通路に補
助開口部を設けることによシバイパス通路における脈動
を干渉させるようｉ −したものでおる。SUMMARY OF THE INVENTION An object of the present invention is to provide an intake air flow rate detection device for an internal combustion engine that can prevent contamination of a hot wire due to backfire or the like and also eliminates an increase in output of a detector that occurs during intake pulsation.゛Ninthly, in order to achieve such an object, the present invention experimentally confirms that the flow velocity fluctuations caused by the engine's one-stroke pulsations act on the bypass air passage, and provides an auxiliary opening in the bypass air passage. It is designed to interfere with pulsation in the bypass passage.
以下、実施例を用いて本発明の詳細な説明する。Hereinafter, the present invention will be explained in detail using Examples.
第１図は本発明による内燃機関用吸入空気流量検出装置
の一実施例を示す断面図、第２図は第１図の１−１線に
おける断面図である。吸入空気流量検出器ｌはその開口
端２ｍ、２ｂに連通する主空気通路が形成され、その中
途部は比較的径が小さくなってベンチュリー３が形成さ
れている。を九、前記主空気通路とほぼ平行に前記開口
端２畠側に同じ開口端を有、するバイパス通路４が形成
され、このバイパス通路４は前記ペンチエリ−３の部分
にて、第２図に示すように、主空気通路の局方向に沿っ
た円弧状を描き、その終端は前記主空気通路に連通して
いる。そして、主空気通路と平行に配置されたバイパス
通路４内には熱線エレメント５が備えられ、この熱線エ
レメント５は吸入空気流量検出器１の外周に取付けられ
良熱線コントロールユニット７に接続されている。また
、主空気通路の周方向に沿ったバイパス通路４はその中
途部にて主空気通路と連通する補助開口部６が形成され
ている。FIG. 1 is a sectional view showing an embodiment of an intake air flow rate detection device for an internal combustion engine according to the present invention, and FIG. 2 is a sectional view taken along line 1--1 in FIG. The intake air flow rate detector 1 has a main air passage communicating with its open ends 2m and 2b, and a venturi 3 is formed with a relatively small diameter in the middle of the main air passage. (9) A bypass passage 4 is formed substantially parallel to the main air passage and having the same opening end on the side of the opening end 2, and this bypass passage 4 is located at the pentier area 3, as shown in FIG. As shown, it draws an arc shape along the local direction of the main air passage, and its terminal end communicates with the main air passage. A hot wire element 5 is provided in the bypass passage 4 arranged parallel to the main air passage, and this hot wire element 5 is attached to the outer periphery of the intake air flow rate detector 1 and connected to the hot wire control unit 7. . Further, the bypass passage 4 along the circumferential direction of the main air passage has an auxiliary opening 6 formed in the middle thereof to communicate with the main air passage.
このように構成した内燃機関用吸入空気流量検出装置に
おいて、計測される空気は主空気通路を開口端２ｂから
２ｍに流れるとともにペンチエリ−３にも流れる。この
際、ペンチエリ−３には負の圧力が発生し、主空気通路
との圧力差によってバイパス通路４には空気の流れが生
じる。このバイパス通路４における空気の流速を熱線エ
レメント５によって計測するととＫよシ主空気通路に流
れる空気流速を検出するものである。In the intake air flow rate detection device for an internal combustion engine configured as described above, the air to be measured flows through the main air passage 2 m from the open end 2b and also flows into the pentier 3. At this time, negative pressure is generated in the pentier 3, and air flow is generated in the bypass passage 4 due to the pressure difference with the main air passage. When the flow velocity of air in the bypass passage 4 is measured by the hot wire element 5, the velocity of air flowing into the main air passage is detected.
ところで、実施例で示す補助開口部６が形成されていな
い従来は機関が高負荷時において主空気通路の空気には
吸気脈動が生じ、機関回転数、吸気脈動速度などの条件
が揃うと、第３図に示すように、ペンチエリ−３の圧力
波形および主空気通路の圧力波形はそれぞれ曲ＭＡ、Ｂ
のようになる。By the way, in conventional systems in which the auxiliary opening 6 shown in the embodiment is not formed, intake pulsation occurs in the air in the main air passage when the engine is under high load, and when conditions such as engine speed and intake pulsation speed are met, As shown in Figure 3, the pressure waveform of Pentieri-3 and the pressure waveform of the main air passage are curves MA and B, respectively.
become that way.
第３図から明らかなように曲線ム、Ｂは経過時間に沿っ
て圧力変化状態にずれがあることから、バイパス通路４
を流れる空気は逆流し、この結果、バイパス通路番を流
れる空気量は多くなシ、流量検出器の出力が実際の空気
流量よシ大きくなるものである。しかし、上述した実施
例のように、ぺ／チュリー３．に補助開口部６を設ける
ことによシ、脈動発生時には補助開口部６からの位相の
ずれた脈動圧力波がバイパス通路４に作用することから
、第４図に示すように、経過時間に沿りて圧力変化状態
にずれがなく、シたがって逆流は防止でき正常な圧力差
となる。As is clear from FIG. 3, curves M and B have deviations in the pressure change state along the elapsed time, so the bypass passage 4
The air flowing through the bypass passage flows backwards, and as a result, the amount of air flowing through the bypass passage is large, and the output of the flow rate detector becomes larger than the actual air flow rate. However, as in the embodiment described above, Bae/Churi 3. By providing auxiliary opening 6 in Therefore, there is no deviation in the pressure change state, and therefore backflow can be prevented and a normal pressure difference can be achieved.
以上述べたことから明らかなように、本発明による内燃
機関用吸入空気流量検出装置によれば、吸気脈動時に発
生する検出器の出力上昇を解消することができるように
なる。As is clear from the above description, according to the intake air flow rate detection device for an internal combustion engine according to the present invention, it is possible to eliminate the increase in output of the detector that occurs during intake pulsation.
第１ｌＩＡは本発明による内燃機関用吸入空気流量検出
装置の一実施例を示す断面図、第２図は第１図のＩ−１
線における断面図、第３図は従来の欠点を説明する丸め
のグラフ、第４図は本発明の詳細な説明するためのグラ
ブである。
４・・・バイハス通路、５・・・熱線エレメント、６・
・・補９２11A is a sectional view showing an embodiment of the intake air flow rate detection device for an internal combustion engine according to the present invention, and FIG. 2 is I-1 in FIG.
3 is a rounded graph illustrating the drawbacks of the prior art, and FIG. 4 is a graph illustrating the present invention in detail. 4. Bypass passage, 5. Heat wire element, 6.
・Supplementary 92
Claims (1)
通路と同じ開口を有しかつ主空気通路方向に延在しベン
チエリ一部にて主空気通路の周方向に沿って終端が主空
気通路と連通するバイパス通路と、主空気通路方向に延
在するバイパス通路内に配置された熱線とを臭儂するも
のべおいて、主空気通路の周方向に沿りたバイパス通路
の中途部に主空気通路と連通する補助開口部を設けたこ
とを特徴とする内燃機関用吸入空気流量検出装置。L A main air passage forming a bench area, which has the same opening as this main air passage, extends in the direction of the main air passage, and has a terminal end communicating with the main air passage along the circumferential direction of the main air passage in a part of the bench area. The main air passage is located in the middle of the bypass passage along the circumferential direction of the main air passage. An intake air flow rate detection device for an internal combustion engine, characterized in that an auxiliary opening communicating with the internal combustion engine is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57014938A JPS58132618A (en) | 1982-02-03 | 1982-02-03 | Device for detecting flow rate of intake air for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57014938A JPS58132618A (en) | 1982-02-03 | 1982-02-03 | Device for detecting flow rate of intake air for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58132618A true JPS58132618A (en) | 1983-08-08 |
| JPH0256610B2 JPH0256610B2 (en) | 1990-11-30 |
Family
ID=11874899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57014938A Granted JPS58132618A (en) | 1982-02-03 | 1982-02-03 | Device for detecting flow rate of intake air for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58132618A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2657429A1 (en) * | 1990-01-22 | 1991-07-26 | Normandie Ateliers | PNEUMATIC MEASURING DEVICE. |
| JP2010261771A (en) * | 2009-05-01 | 2010-11-18 | Denso Corp | Device for measurement of air flow rate |
-
1982
- 1982-02-03 JP JP57014938A patent/JPS58132618A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2657429A1 (en) * | 1990-01-22 | 1991-07-26 | Normandie Ateliers | PNEUMATIC MEASURING DEVICE. |
| US5140846A (en) * | 1990-01-22 | 1992-08-25 | Ateliers De Normandie | Pneumatic measurement apparatus |
| JP2010261771A (en) * | 2009-05-01 | 2010-11-18 | Denso Corp | Device for measurement of air flow rate |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0256610B2 (en) | 1990-11-30 |
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