JPS58109815A - Air flow meter - Google Patents
Air flow meterInfo
- Publication number
- JPS58109815A JPS58109815A JP56214741A JP21474181A JPS58109815A JP S58109815 A JPS58109815 A JP S58109815A JP 56214741 A JP56214741 A JP 56214741A JP 21474181 A JP21474181 A JP 21474181A JP S58109815 A JPS58109815 A JP S58109815A
- Authority
- JP
- Japan
- Prior art keywords
- pass
- air
- air flow
- passage
- venturi
- 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
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】
内燃機関用の吸入空気流量検出装置に係夛、特に熱線を
用い九エアフローメータに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake air flow rate detection device for an internal combustion engine, particularly to an air flow meter using a hot wire.
主空気通路をバイパスするバイパス通路に熱線を設けた
エアフローメータを横置で使用する場合、バイパス通路
の出口がベンチュリの量下面に開口しているとこの部分
で主吸気通路内の水分がバイパス通路に浸入する問題が
ある。When using a horizontally installed air flow meter with a hot wire in the bypass passage that bypasses the main air passage, if the outlet of the bypass passage opens at the bottom of the venturi, moisture in the main intake passage will flow through the bypass passage. There is a problem of infiltration.
本発明の目的は、主空気通路に分岐するノ（イノくス方
式エア７０−メータにおいて、）（イノくス通路での水
の蓄積を防止するエアフローメータを提供することにあ
る。SUMMARY OF THE INVENTION It is an object of the present invention to provide an air flow meter that prevents the accumulation of water in the air passageway (in an air flow meter) that branches into the main air passageway.
第１．２図によって、本発明の一爽施例を説明する。エ
アフローメータ１は、主空気通路２ ａ。An exemplary embodiment of the present invention will be explained with reference to FIG. 1.2. The air flow meter 1 is connected to the main air passage 2a.
２ｂとベンチュリ３、バイパス通路４、横通路４ａＳ環
状通路４ｂ、熱線エレメント５、熱線駆動回路６で構成
されている。バイパス通路４は、ベンチュリ３部に開口
分岐し、他端をべ／チュリ３上流の主空気通路２ｂに開
口している。熱線エレメ゛ント５はバイパス通路の横道
路４ａに設けられ熱線駆動回路６に接続されている。2b, a venturi 3, a bypass passage 4, a side passage 4aS, an annular passage 4b, a hot wire element 5, and a hot wire drive circuit 6. The bypass passage 4 opens and branches into the venturi 3, and the other end opens into the main air passage 2b upstream of the venturi 3. The hot wire element 5 is provided on the side road 4a of the bypass passage and is connected to the hot wire drive circuit 6.
計測される空気は、主空気通路２・ｂ１ベンチュリ３、
主空気通路２ｍへと流れる。この時べ／チェ９部３は絞
られているため負の圧力が発生し、主空気通路部２ｂと
の圧力差によってバイパス通路４に空気流が生じる。こ
の空気流速を熱線エレメント５によって計測する。この
ことはすでに周知の通り、バイパス通路の流速を検出す
ることによって全体の空気流量が計量できる。The air to be measured is the main air passage 2, b1 venturi 3,
Flows into the main air passage 2m. At this time, negative pressure is generated in the bay/chef 9 section 3 because it is constricted, and an air flow is generated in the bypass passage 4 due to the pressure difference with the main air passage section 2b. This air flow velocity is measured by the hot wire element 5. As is already well known, by detecting the flow velocity in the bypass passage, the total air flow rate can be measured.
バイパス通路４の出ロアは、ベンチュリ内壁の最下部に
は開口せず、少し上方に開口している。The lower exit of the bypass passage 4 does not open at the lowest part of the venturi inner wall, but opens slightly upward.
エアクリーナからエンジンへ至る間の空気通路において
、雪又は、水分又は冷却等によシ、空気中の水分が液化
した場合の水分は通路内の下部にたまり、下部内壁をつ
たわって流れる。この場合にも本発明のものなら、バイ
パス通路４に水が進入することなく、バイパス通路を水
でふさぐことはない。In the air passage from the air cleaner to the engine, when moisture in the air liquefies due to snow, moisture, cooling, etc., the moisture accumulates in the lower part of the passage and flows along the inner wall of the lower part. Even in this case, with the present invention, water will not enter the bypass passage 4 and the bypass passage will not be blocked by water.
本発明によれば、バイパス通路４の出ロアから水が浸入
することがなく、水だまシによるエア７０−メータの作
動不能ということはない。According to the present invention, water does not enter from the outlet lower part of the bypass passage 4, and the air meter 70 does not become inoperable due to water accumulation.
第１図は本発明の一実施例になるエアフローメータの１
＃？面図、第２図は第１図のＰ矢視図である。
１・・・エア７０−メータ、２ａ、２ｂ・・・主空気通
路、３・・・ベンチュリ、４・・・バイパス通路、４ｇ
・・・横通路、４ｂ・・・環状通路、７・・・出口。
代理人 弁理士 高橋明夫Figure 1 shows one example of an air flow meter that is an embodiment of the present invention.
#? The top view, FIG. 2 is a view taken along arrow P in FIG. 1... Air 70-meter, 2a, 2b... Main air passage, 3... Venturi, 4... Bypass passage, 4g
...Horizontal passage, 4b...Circular passage, 7...Exit. Agent Patent Attorney Akio Takahashi
Claims (1)
がエア７０−メータの中心を通る水平面よシ上側で、出
口が中心を通る水平面よシ下側に開口し、開口部がスリ
ット状であるエア７０−メータにおいて、ベンチュリ内
壁の最下部には、スリットが開口にしないエア７０−メ
ータ。1. A hot wire is installed in the bypass passage, and the bypass inlet is above the horizontal plane passing through the center of the air 70-meter, the outlet is below the horizontal plane passing through the center, and the opening is in the form of a slit. - In the meter, the lowest part of the venturi inner wall has a slit that does not open the air 70 - meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56214741A JPS58109815A (en) | 1981-12-23 | 1981-12-23 | Air flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56214741A JPS58109815A (en) | 1981-12-23 | 1981-12-23 | Air flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58109815A true JPS58109815A (en) | 1983-06-30 |
Family
ID=16660819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56214741A Pending JPS58109815A (en) | 1981-12-23 | 1981-12-23 | Air flow meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58109815A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4624134A (en) * | 1983-11-16 | 1986-11-25 | Hitachi, Ltd. | Hot-wire air-flow meter |
| US4986116A (en) * | 1988-10-18 | 1991-01-22 | Hitachi, Ltd. | Air flow meter for internal combustion engine |
-
1981
- 1981-12-23 JP JP56214741A patent/JPS58109815A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4624134A (en) * | 1983-11-16 | 1986-11-25 | Hitachi, Ltd. | Hot-wire air-flow meter |
| US4986116A (en) * | 1988-10-18 | 1991-01-22 | Hitachi, Ltd. | Air flow meter for internal combustion engine |
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