JPH0566525B2 - - Google Patents
Info
- Publication number
- JPH0566525B2 JPH0566525B2 JP59121832A JP12183284A JPH0566525B2 JP H0566525 B2 JPH0566525 B2 JP H0566525B2 JP 59121832 A JP59121832 A JP 59121832A JP 12183284 A JP12183284 A JP 12183284A JP H0566525 B2 JPH0566525 B2 JP H0566525B2
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- flow rate
- intake passage
- thermal air
- present
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は内燃機関の吸入空気流量計装置に係
り、特に感熱抵抗体を用い高精度な計測ができる
熱式空気流量計に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an intake air flow meter device for an internal combustion engine, and more particularly to a thermal air flow meter that uses a heat-sensitive resistor and is capable of highly accurate measurement.
従来、内燃機関の吸入空気量を計測する熱式空
気流量計としては、特公昭57−49846がある。こ
の流量計の構造は流量検出用感熱抵抗体と温度補
償用感熱抵抗体の下流側に逆流防止部材を設けた
ものである。しかし逆流防止対策として設けた逆
流防止部材は、流量検出用抵抗体と温度補償抵抗
体の両方を保護するため、形状が大きくなる。こ
のため、吸気通路の断面積が変化し、流速及び流
速分布が変化する。また、前記抵抗体の支持とは
別個に逆流防止材を設けるため、吸気系全体の圧
力損失が大きくなり、内燃機関の動力性能が低下
するという問題があつた。
Conventionally, there is a thermal air flow meter for measuring the intake air amount of an internal combustion engine, which is the Japanese Patent Publication No. 57-49846. The structure of this flowmeter is such that a backflow prevention member is provided on the downstream side of the heat-sensitive resistor for flow rate detection and the heat-sensitive resistor for temperature compensation. However, the backflow prevention member provided as a backflow prevention measure has a large shape because it protects both the flow rate detection resistor and the temperature compensation resistor. Therefore, the cross-sectional area of the intake passage changes, and the flow velocity and flow velocity distribution change. Furthermore, since a backflow prevention material is provided separately from supporting the resistor, there is a problem in that the pressure loss of the entire intake system becomes large and the power performance of the internal combustion engine is reduced.
本発明の目的は、吸気系全体の圧力損失を損う
ことなく逆流領域における計測精度を向上させた
熱式空気流量計を提供するにある。
SUMMARY OF THE INVENTION An object of the present invention is to provide a thermal air flow meter that improves measurement accuracy in a backflow region without impairing the pressure loss of the entire intake system.
本発明ではエンジン全開付近で、また全開で顕
著な吹き返しによる計測精度の低下を防止するた
め、第２図に示すように流量検出用感熱抵抗体１
の下流側に整流部材２を設ける。該感熱抵抗体の
外径d1、投影面積S1、整流部材の投影面積S2とす
ると、S1≦S2とし、該感熱抵抗体と整流部材との
間隙は、≧d1とする。
In the present invention, in order to prevent a decrease in measurement accuracy due to noticeable blowback near or at full throttle of the engine, as shown in FIG.
A rectifying member 2 is provided on the downstream side. Assuming that the outer diameter d 1 of the heat-sensitive resistor, the projected area S 1 and the projected area S 2 of the rectifying member are S 1 ≦S 2 , and the gap between the heat-sensitive resistor and the rectifying member is ≧d 1 .
以下本発明の実施例について説明する。吸気通
路に設けられたボデイ３内の流量検出用感熱抵抗
体１と該抵抗体の真下に本発明による円柱状整流
部材２及び空気補償用感熱抵抗体４を配置し、流
量計を構成している。正常な空気流に対しては、
整流部材２が流量検出用抵抗体１の真下に配置し
ているため、特性に影響を与えず、吹き返しによ
る逆流のみ直接流量検出用抵抗体１に当たらない
ようになる。本発明の実施例によれば、第６図，
第７図に示すように逆流による影響を低減でき
る。また、流量検出用抵抗体の真下に配置したた
め小形であり、このため圧力損失が小さくでき
る。
Examples of the present invention will be described below. A flowmeter is constructed by arranging a heat-sensitive resistor 1 for detecting flow rate in a body 3 provided in an intake passage, and a cylindrical rectifying member 2 and a heat-sensitive resistor 4 for air compensation according to the present invention arranged directly below the resistor. There is. For normal airflow,
Since the rectifying member 2 is arranged directly below the flow rate detection resistor 1, the characteristics are not affected and only the backflow due to blowback does not directly hit the flow rate detection resistor 1. According to an embodiment of the invention, FIG.
As shown in FIG. 7, the influence of backflow can be reduced. In addition, since it is placed directly below the flow rate detection resistor, it is small, and therefore pressure loss can be reduced.
第４図に本発明の他の実施例を示す。流量検出
用抵抗体とその真下に配置した整流部材２と温度
補償用抵抗体４を吸気通路にバイパスして設けた
バイパス通路５内に設け、流量計を構成してい
る。 FIG. 4 shows another embodiment of the invention. A flow meter is constructed by providing a flow rate detection resistor, a rectifying member 2 disposed directly below the flow rate detection resistor, and a temperature compensation resistor 4 in a bypass passage 5 that bypasses the intake passage.
本実施例によれば、逆流の影響を低減できるほ
か、圧力損失が小さく、小形にできる。また、バ
ツクフアイア等の強い火焔から流量検出用抵抗体
を保護できる。 According to this embodiment, the influence of backflow can be reduced, pressure loss is small, and the device can be made compact. In addition, the flow rate detection resistor can be protected from strong flames such as backfire.
本発明によれば、吸気系の圧力損失を損うこと
なく吹き返しの影響を低減し、計測精度を向上で
きる効果がある。
According to the present invention, the effect of blowback can be reduced without impairing pressure loss in the intake system, and measurement accuracy can be improved.
第１図および第２図は本発明の実施例を示す平
面図およびＰ視図、第３図は本発明の実施例を示
す外観図、第４図は本発明の他の実施例を示す外
観図、第５図は本発明の構成を説明するモデル
図、第６図は本発明の効果を示す流量特性図、第
７図は本発明の効果を示すエンジン特性図であ
る。
１……流量検出用感熱抵抗体、２……整流部
材、３……ボデイ、４……空気温補償用感熱抵抗
体、５……バイパス追路、６……モジユール。
1 and 2 are a plan view and a P view showing an embodiment of the present invention, FIG. 3 is an external view showing an embodiment of the present invention, and FIG. 4 is an external view showing another embodiment of the present invention. 5 is a model diagram explaining the configuration of the present invention, FIG. 6 is a flow rate characteristic diagram showing the effects of the present invention, and FIG. 7 is an engine characteristic diagram showing the effects of the present invention. DESCRIPTION OF SYMBOLS 1... Heat-sensitive resistor for flow rate detection, 2... Rectifying member, 3... Body, 4... Heat-sensitive resistor for air temperature compensation, 5... Bypass follow-up path, 6... Module.
Claims (1)
量計において、流量検出用円柱状感温抵抗体の吸
気通路の中心軸に沿つて下流側に該抵抗体の投影
面積と少くとも同じ投影面積を有し、該抵抗体の
外径と少くとも同じ寸法の間隙を有するような整
流部材を設けたことを特徴とする熱式空気流量
計。 ２ 特許請求の範囲第１項において、吸気通路が
主通路に対してバイパスしたバイパス通路である
ことを特徴とする熱式空気流量計。[Scope of Claims] 1. In a thermal air flowmeter disposed in an intake passage of an internal combustion engine, the projected area of a cylindrical temperature-sensitive resistor for detecting flow rate is located downstream along the central axis of the intake passage. 1. A thermal air flow meter comprising a rectifying member having a projected area at least the same as that of the resistor and having a gap at least the same size as the outer diameter of the resistor. 2. The thermal air flowmeter according to claim 1, wherein the intake passage is a bypass passage bypassing the main passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59121832A JPS612020A (en) | 1984-06-15 | 1984-06-15 | Thermal air flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59121832A JPS612020A (en) | 1984-06-15 | 1984-06-15 | Thermal air flow meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS612020A JPS612020A (en) | 1986-01-08 |
| JPH0566525B2 true JPH0566525B2 (en) | 1993-09-22 |
Family
ID=14821029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59121832A Granted JPS612020A (en) | 1984-06-15 | 1984-06-15 | Thermal air flow meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS612020A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62181706A (en) * | 1986-02-04 | 1987-08-10 | 株式会社クボタ | Apparatus for mounting front mount working machine |
| JP3133608B2 (en) * | 1994-02-28 | 2001-02-13 | 株式会社ユニシアジェックス | Thermal air flow detector |
-
1984
- 1984-06-15 JP JP59121832A patent/JPS612020A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS612020A (en) | 1986-01-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3285513B2 (en) | Thermal flow sensor and intake device for internal combustion engine | |
| US6701781B1 (en) | Mass air flow sensor bypass housing | |
| EP0054887B1 (en) | Air flow meter assembly | |
| JPH10300545A (en) | Thermosensitive flow rate sensor | |
| JP3240782B2 (en) | Hot wire type air flow meter | |
| JP2857787B2 (en) | Thermal air flow meter and internal combustion engine equipped with the flow meter | |
| GB2158590A (en) | Air induction system for an internal combustion engine | |
| JPH0566525B2 (en) | ||
| JPH0672793B2 (en) | Flow rate detector | |
| JPH0320619A (en) | hot wire air flow meter | |
| JPS6126822A (en) | Thermal type air flow rate detecting device | |
| JPH0626903A (en) | Air flow measuring device | |
| JP3378833B2 (en) | Heating resistor type air flow measurement device | |
| JPS633422Y2 (en) | ||
| JPS5821517A (en) | Sensor for karman's vortex street flow rate | |
| JPS6131923A (en) | Thermal detecting device for gas flow rate | |
| JPS61264216A (en) | hot wire air flow meter | |
| JP2515018Y2 (en) | Intake air flow rate measuring device for internal combustion engine | |
| JPH0337687B2 (en) | ||
| JPH0314426U (en) | ||
| JPH06288805A (en) | Air flowmeter | |
| JPH03269220A (en) | hot wire air flow meter | |
| JPH04290918A (en) | Structure of flow straightening element for air flow meter | |
| JPH04344424A (en) | Hot wire type air flow meter | |
| JP2001059759A (en) | Heating resistance type flow measurement device |