JPH0256610B2 - - Google Patents
Info
- Publication number
- JPH0256610B2 JPH0256610B2 JP57014938A JP1493882A JPH0256610B2 JP H0256610 B2 JPH0256610 B2 JP H0256610B2 JP 57014938 A JP57014938 A JP 57014938A JP 1493882 A JP1493882 A JP 1493882A JP H0256610 B2 JPH0256610 B2 JP H0256610B2
- Authority
- JP
- Japan
- Prior art keywords
- main air
- air passage
- passage
- flow rate
- 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.)
- Expired - Lifetime
Links
- 238000001514 detection method Methods 0.000 claims description 10
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 230000010349 pulsation Effects 0.000 description 8
- 206010016754 Flashback Diseases 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
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)
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
り、特に熱線を用いた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 more particularly to an air flow rate detection device using a hot wire.
この種の空気流量検出装置は、従来、主空気通
路に熱線を備えたもの、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。 BACKGROUND ART Conventionally, this type of air flow rate detection device includes one equipped with a hot wire in the main air passage or one equipped with a hot wire in a bypass passage.
しかし、前者は逆火等により熱線が汚れて性能
劣化が生じるという優いがあり、また、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測定できないという欠点
があつた（特開昭55−14938号公報参照）。 However, the former has the advantage that the hot wire becomes dirty due to flashbacks, etc., resulting in performance deterioration, and the latter, even if it is possible to prevent the hot wire from getting dirty, the air flow rate detector is affected by the intake pulsation that occurs when the engine is under high load. The disadvantage was that the output increased and the true air flow rate could not be measured (see Japanese Patent Laid-Open No. 14938/1983).
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、吸気脈動時に発生する検出器
の出力上昇を解消した内燃機関用吸入空気流量検
出装置を提供するにある。 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, etc., and also eliminate the increase in detector output that occurs during intake pulsation.
このような目的を達成するために、本発明は、
機関の吸気脈動によつ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
りバイパス通路における脈動を干渉させるように
したものである。 In order to achieve such an objective, the present invention
We experimentally confirmed that the flow velocity fluctuations caused by the engine's intake pulsation affect the bypass air passage.
By providing an auxiliary opening in the bypass air passage, pulsations in the bypass air passage are interfered with.
以下、実施例を用いて本発明を詳細に説明す
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−線における断面図である。吸入空気流
量検出器１はその開口端２ａ，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
さくなつてベンチユリー３が形成されている。ま
た、前記主空気通路とほぼ平行に前記開口端２ａ
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は前記ベンチユリー３の
部分にて、第２図に示すように、主空気通路の周
方向に沿つた円弧状を描き、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た熱線コン
トロールユニツト７に接続されている。また、主
空気通路の周方向に沿つたバイパス通路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 one embodiment of an intake air flow rate detection device for an internal combustion engine according to the present invention, and FIG.
It is a sectional view taken along the - line in the figure. The intake air flow rate detector 1 has a main air passage communicating with its open ends 2a and 2b, and a ventilate 3 is formed with a relatively small diameter in the middle of the main air passage. Further, the opening end 2a is substantially parallel to the main air passage.
A bypass passage 4 having the same opening end is formed on the side, and this bypass passage 4 draws an arc shape along the circumferential direction of the main air passage at the ventilee 3, as shown in FIG. The 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 connected to a hot wire control unit 7 attached to the outer periphery of the intake air flow rate detector 1. . 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２ａに流れるとともにベンチユリ
ー３にも流れる。この際、ベンチユリー３には負
の圧力が発生し、主空気通路との圧力差によつて
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によつて計測することにより主空気通路に流
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 from the open end 2b to 2a and also flows into the ventilate 3. At this time, negative pressure is generated in the ventilate 3, and air flow is generated in the bypass passage 4 due to the pressure difference with the main air passage. By measuring the flow velocity of air in the bypass passage 4 with the hot wire element 5, the flow velocity of the air flowing in 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、ベンチユリー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線Ａ，Ｂのようにな
る。第３図から明らかなように曲線Ａ，Ｂは経過
時間に沿つ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４を流れる空気量は多くな
り、流量検出器の出力が実際の空気流量より大き
くなるものである。しかし、上述した実施例のよ
うに、ベンチユリー３に補助開口部６を設けるこ
とにより、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
つて圧力変化状態にずれがなく、したがつて逆流
は防止でき正常な圧力差となる。 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 FIG. 3, the pressure waveform of the ventilate 3 and the pressure waveform of the main air passage are curves A and B, respectively. As is clear from FIG. 3, curves A and B have a difference in pressure change state over time, so the air flowing through the bypass passage 4 flows backwards, and as a result, the amount of air flowing through the bypass passage 4 is large. Therefore, the output of the flow rate detector is larger than the actual air flow rate. However, as in the embodiment described above, by providing the auxiliary opening 6 in the ventilate 3, when pulsation occurs, a pulsating pressure wave out of phase from the auxiliary opening 6 acts on the bypass passage 4. As shown in the figure, there is no deviation in the state of pressure change over time, so 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 becomes possible to eliminate the increase in detector output that occurs during intake pulsation.
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−線における断面図、第３図は従来の欠
点を説明するためのグラフ、第４図は本発明の効
果を説明するためのグラフである。
４……バイパス通路、５……熱線エレメント、
６……補助開口部。
FIG. 1 is a sectional view showing one embodiment of an intake air flow rate detection device for an internal combustion engine according to the present invention, and FIG.
3 is a graph for explaining the drawbacks of the conventional method, and FIG. 4 is a graph for explaining the effects of the present invention. 4... Bypass passage, 5... Heat wire element,
6...Auxiliary opening.
Claims (1)
主空気通路と同じ開口を有しかつ主空気通路方向
に延在しベンチユリー部にて主空気通路の周方向
に沿つ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具備するものにおいて、主
空気通路の周方向に沿つ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。1. A main air passage forming a ventilate, which has the same opening as the 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 at the ventilate part. An auxiliary opening that communicates with the main air passage in the middle of the bypass passage along the circumferential direction of the main air passage in a device comprising a bypass passage and a hot wire arranged in the bypass passage extending in the direction of the main air passage. An intake air flow rate detection device for an internal combustion engine, characterized in that an intake air flow rate detection device is provided with a section.
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 JPS58132618A (en) | 1983-08-08 |
| JPH0256610B2 true 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) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2657429B1 (en) * | 1990-01-22 | 1995-08-11 | Normandie Ateliers | PNEUMATIC MEASURING DEVICE. |
| JP5168223B2 (en) * | 2009-05-01 | 2013-03-21 | 株式会社デンソー | Air flow measurement device |
-
1982
- 1982-02-03 JP JP57014938A patent/JPS58132618A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58132618A (en) | 1983-08-08 |
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