JPS61137018A - Apparatus for detecting air intake amount of internal combustion engine - Google Patents
Apparatus for detecting air intake amount of internal combustion engineInfo
- Publication number
- JPS61137018A JPS61137018A JP60252751A JP25275185A JPS61137018A JP S61137018 A JPS61137018 A JP S61137018A JP 60252751 A JP60252751 A JP 60252751A JP 25275185 A JP25275185 A JP 25275185A JP S61137018 A JPS61137018 A JP S61137018A
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- temperature
- air
- intake
- internal combustion
- 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
Landscapes
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Measuring Volume Flow (AREA)
- Testing Of Engines (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は内燃機関の吸気量検出装置に係り、詳しくは吸
気通路内に感温抵抗体を挿入し、この抵抗体の電気的出
力により吸気量を検知する装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake air amount detection device for an internal combustion engine, and more particularly to a device that inserts a temperature-sensitive resistor into an intake passage and detects the intake air amount based on the electrical output of this resistor.
内燃機関の吸気路内に感温抵抗を挿入して、吸気流量を
検出することは例えば特公昭４７−４０２３０号公報な
どで公知である。It is known, for example, in Japanese Patent Publication No. 47-40230, to detect the intake air flow rate by inserting a temperature-sensitive resistor into the intake passage of an internal combustion engine.
この検出装置においては、感温抵抗の発生する熱量が吸
入空気に持ち去られることにより、発生熱量と放熱量と
のバランスにより、空気流量を検出するものである。In this detection device, the amount of heat generated by the temperature-sensitive resistor is carried away by the intake air, and the air flow rate is detected based on the balance between the amount of heat generated and the amount of heat released.
この空気流量の検知を精度よく行うには、空気温度の変
化を補正することが必要である。そのために空気温度を
検知する別の感温抵抗体を設け、測定された空気温度に
対して、流速測定用の感温抵抗の温度を所定温度（例え
ば、２００℃）高く保持するように制御する。ここで、
空気温度検出用の感温抵抗は、空気温度の変化の補正を
正確にするためには、流速測定用抵抗体の近くに配置す
ることが必要である。しかしながら、両者を近接配置す
ると、空気温検出用抵抗は、流速検出用抵抗の熱（例え
ば、２２０〜２３０℃）をも検知することになる。また
、吸入通路内の第１の加熱抵抗体の下流に第２の加熱抵
抗を設けると、第１の加熱抵抗の下流には渦が発生する
。渦は、流速が変化するため、正確な測定が困難となる
。In order to accurately detect this air flow rate, it is necessary to correct changes in air temperature. For this purpose, another temperature-sensitive resistor is provided to detect the air temperature, and the temperature of the temperature-sensitive resistor for flow velocity measurement is controlled to be maintained at a predetermined temperature (for example, 200°C) higher than the measured air temperature. . here,
The temperature-sensitive resistor for detecting air temperature needs to be placed near the resistor for measuring flow velocity in order to accurately correct changes in air temperature. However, if both are placed close to each other, the air temperature detection resistor will also detect the heat (for example, 220 to 230° C.) of the flow velocity detection resistor. Further, when a second heating resistor is provided downstream of the first heating resistor in the suction passage, a vortex is generated downstream of the first heating resistor. Vortices change the flow velocity, making accurate measurement difficult.
本発明は、２つの感温抵抗を吸入通路内で空気の流れ方
向に対してずらして配置するようにしたものである。In the present invention, two temperature-sensitive resistors are arranged in a suction passage so as to be shifted from each other in the air flow direction.
第１図において、シリンダヘッド１０１にガスケット１
０２を介し、ボルト１０３で吸気管１０４をとりつけ、
もれを防止するとともに、−気管１０４の過熱を防止す
る。吸気管１０４には、盲ふた１１２をした小孔１１３
が設けられている。In FIG. 1, a gasket 1 is attached to a cylinder head 101.
Attach the intake pipe 104 with bolts 103 through 02,
In addition to preventing leakage, - preventing overheating of the trachea 104; The intake pipe 104 has a small hole 113 with a blind lid 112.
is provided.
この小孔１１３を用い、吸気管内の圧力を測定すること
ができる。吸気管１０４には、パツキン１０５を介して
、ボルト１０８で絞り弁１０７を有する絞り弁［１０６
が取り付けられる。絞り弁胴１０８、あるいは吸気管１
０４の一部には、小孔１．１４．］、１５を設けてもよ
い。真空進角排気還流などの制御負圧、あるいは信号と
して用いられる。絞り弁胴１０６にはパツキン１０９を
介しボルト１１０でセンサＷｉｌｌが取り付けられる。This small hole 113 can be used to measure the pressure inside the intake pipe. A throttle valve [106
can be installed. Throttle valve body 108 or intake pipe 1
04 has small holes 1.14. ], 15 may be provided. It is used as a control negative pressure for vacuum advance, exhaust gas recirculation, etc., or as a signal. A sensor Will is attached to the throttle valve body 106 with a bolt 110 via a packing 109.
センサ筒１１１には感熱抵抗１１６が取り付けられる。A heat-sensitive resistor 116 is attached to the sensor tube 111.
感熱抵抗１１６の一端はリード線１１７を介してセンサ
筒１１１に絶縁材１１９を介して取りつけられる。One end of the heat-sensitive resistor 116 is attached to the sensor tube 111 via a lead wire 117 via an insulating material 119.
第２図に示したごとく、絶縁材１１９はポル１−１２１
、パツキン１２２を介してセンサ筒１１１に取り付けら
れる。リード線１１７の他端は端子１２４を介して、リ
ード線１１８で外部に取り出させる。あるいはセンサ筒
１１１に固定された処理回路１２３の端子１２５に取り
付けられる。センサ筒１１１には同様な方法で第２図に
示した感温抵抗１２０が取り付けられる。感温抵抗１１
６は吸入空気より高い温度に保持され、一部の熱はリー
ド線１１７を介し絶縁材１１９の方に伝導される。した
がって、リード線１１７，１２６はできるだけ細くする
必要がある。センサ筒１１７と絶縁材１１９，１２７の
熱膨張の差は、パツキン１２２．１２８で吸収すること
ができる。また絶縁材１１９は、接着材１２９でセンサ
筒１１１に取り付けてもよい。センサ筒１１１．感熱抵
抗１１６、リード線１１７の熱膨張の差は、リード線ｉ
ｉ７，１２６で吸収する。この熱膨張の差を吸収するた
め、リード線１１７，１２６の一部にたわみ部１３０，
１３１を設けることができる。As shown in FIG. 2, the insulation material 119 is
, is attached to the sensor cylinder 111 via a packing 122. The other end of the lead wire 117 is taken out to the outside by a lead wire 118 via a terminal 124. Alternatively, it is attached to the terminal 125 of the processing circuit 123 fixed to the sensor tube 111. A temperature-sensitive resistor 120 shown in FIG. 2 is attached to the sensor tube 111 in a similar manner. Temperature sensitive resistance 11
6 is maintained at a higher temperature than the intake air, and some of the heat is conducted to the insulating material 119 via the lead wire 117. Therefore, the lead wires 117 and 126 need to be made as thin as possible. The difference in thermal expansion between the sensor tube 117 and the insulating materials 119 and 127 can be absorbed by the packings 122 and 128. Further, the insulating material 119 may be attached to the sensor tube 111 with an adhesive 129. Sensor cylinder 111. The difference in thermal expansion between the heat sensitive resistor 116 and the lead wire 117 is determined by the lead wire i.
Absorb at i7,126. In order to absorb this difference in thermal expansion, a bending portion 130 is provided on a portion of the lead wires 117 and 126.
131 can be provided.
また、第３図に示したごとく、感熱抵抗１１６、感温抵
抗１２０を同一絶縁材１１９に取り付け、さらに、処理
のための電気回路１３２を絶縁材１１９ （セラミック
など）上に設けることができる。第２図において、絶縁
材１１９の表面が水、ごみなどで抵抗１１６，１２０の
抵抗値が変化するので、絶縁材１１９の表面積を増大す
ることができる。水分の付着に関しては絶縁材１１９の
表面が冷されないことが要件である。Further, as shown in FIG. 3, the heat-sensitive resistor 116 and the temperature-sensitive resistor 120 can be attached to the same insulating material 119, and furthermore, an electric circuit 132 for processing can be provided on the insulating material 119 (ceramic or the like). In FIG. 2, the surface area of the insulating material 119 can be increased because the resistance values of the resistors 116 and 120 change due to water, dirt, etc. on the surface of the insulating material 119. Regarding the adhesion of moisture, it is necessary that the surface of the insulating material 119 is not cooled.
エンジンのシリンダヘッド１０１の熱が吸気筒１０４に
伝達されるのは、ガスケット１０２で防止される。吸気
管１０４、あるいは絞り弁胴１０６の一部を、温水ジャ
ケット１０３，１３８で加熱し、絞り弁１０７がアイシ
ングなどで固着するのを防止したり、吸気管１０４の内
壁に付着した熱料を蒸発する場合がある。この場合、絞
り弁胴１０６からセンサ筒１１１に伝ねる熱は、パツキ
ン１０９で防止できる。したがって、センサ筒１１１は
、吸入空気と同程度の温度に維持される。The gasket 102 prevents heat from the cylinder head 101 of the engine from being transferred to the intake cylinder 104. The intake pipe 104 or a part of the throttle valve body 106 is heated with the hot water jackets 103 and 138 to prevent the throttle valve 107 from sticking with icing, etc., and to evaporate heating material adhering to the inner wall of the intake pipe 104. There are cases where In this case, the gasket 109 can prevent heat from being transmitted from the throttle valve body 106 to the sensor tube 111. Therefore, the sensor cylinder 111 is maintained at about the same temperature as the intake air.
吸気人口１４４、吸気人口１４３から熱交換器１４２（
ホットエア用で省略することもできる）を介し、切換弁
１４１を通り、エアクリーナエレメント１４０を通り、
センサ筒１１１に供給される空気、エアクリーナ１３９
．センサ筒１１１外部の空気と熱交換を行う、しかし一
般にセンサ筒１１１の内側の熱伝達率が外側に比べ高く
、センサ筒１１１は、吸入空気と同程度の温度である。From the intake population 144 and intake population 143 to the heat exchanger 142 (
(can be omitted as it is for hot air), passes through the switching valve 141, passes through the air cleaner element 140,
Air supplied to the sensor cylinder 111, air cleaner 139
．． The sensor cylinder 111 exchanges heat with the air outside the sensor cylinder 111, but generally the heat transfer coefficient inside the sensor cylinder 111 is higher than that outside the sensor cylinder 111, and the temperature of the sensor cylinder 111 is about the same as that of the intake air.
処理回路１２３の発熱量の一部は、センサ筒１１１を介
し、吸入空気に伝えられ、処理回路１２３の過熱が防止
される。処理回路１２３の近くのセンサ筒１１１が局所
的に加熱されるのを防止するため、センサ筒１１１は熱
伝道率の高い金属（アルミニウム）で造られる。センサ
筒１１１の加熱による空気の温度変化を防止するため、
感温抵抗１０２、感熱抵抗１１６を処理回路１２３の放
熱部より上流に設け、かつ、処理回路１２３と上記の抵
抗１２０，１１６の取り付は部分パツキンで熱しゃ断す
ることができる。１３７，１３８は温水ジャケットであ
る。A part of the heat generated by the processing circuit 123 is transmitted to the intake air via the sensor cylinder 111, thereby preventing the processing circuit 123 from overheating. In order to prevent the sensor tube 111 near the processing circuit 123 from being locally heated, the sensor tube 111 is made of metal (aluminum) with high thermal conductivity. In order to prevent temperature changes in the air due to heating of the sensor cylinder 111,
The temperature-sensitive resistor 102 and the heat-sensitive resistor 116 are provided upstream of the heat dissipation section of the processing circuit 123, and the processing circuit 123 and the above-mentioned resistors 120 and 116 can be mounted to be heat-insulated by partial packing. 137 and 138 are hot water jackets.
こ、こで、本発明の要部について、第３図を用いて説明
する。感熱抵抗１１６は流速を測定するため、空気温度
より高く加熱され、発熱量の一部は空気への対流以外に
、輻射、伝導によって熱が外部に失われる。リードｍ１
１７あるいは支柱は、熱抵抗が大きいことが望ましい。Now, the main parts of the present invention will be explained using FIG. 3. Since the heat-sensitive resistor 116 measures the flow velocity, it is heated to a higher temperature than the air temperature, and part of the heat generated is lost to the outside by radiation and conduction in addition to convection to the air. lead m1
It is desirable that the support 17 or the support column has high thermal resistance.
これによって熱伝導の量を無視できる程度まで小さくす
る。抵抗１１６の下流の吸入空気は上流側より温度が上
昇する。したがって、抵抗１１６．１２０は、お互いに
この温度上昇の影響を受けない個所、例えば第３図に示
した温度境界層Ａ、Ｂ以外の領域に、抵抗１２０を設け
る。又抵抗１１６に、抵抗１２０の渦流域が影響を及ぼ
さない個所に抵抗１２０が配設される。また抵抗１１６
の輻射によって、抵。This reduces the amount of heat conduction to a negligible level. The temperature of the intake air downstream of the resistor 116 increases from that on the upstream side. Therefore, the resistors 116 and 120 are provided at locations that are not mutually affected by this temperature increase, for example, in regions other than the temperature boundary layers A and B shown in FIG. Further, a resistor 120 is disposed on the resistor 116 at a location where the eddy area of the resistor 120 does not have an influence. Also resistance 116
Due to the radiation of
抗１２０が加熱されるのを防止するため、抵抗１２０と
１１６の間に、輻射防止板１４６が設けられる。感温抵
抗１２０は、吸入空気温度と同じ温度に維持される。抵
抗１２０も自己発熱による加熱、抵抗の熱容量、リード
線１２６あるいは支柱の伝導によって、温度差が生じや
すい、したがって、リード線１２６、あるいは支柱を細
くし、伝導の影響を小さくする。また熱容量を小さくす
るため、抵抗１２０を細線（０，１ｍ以下の径）で構成
し、セラミック多孔材などの熱抵抗の大きい材料で支持
するのが望ましい、さらに自己発熱は、対流表面積を大
きくして、すみやかに放散させる。A radiation prevention plate 146 is provided between resistors 120 and 116 to prevent resistor 120 from being heated. The temperature sensitive resistor 120 is maintained at the same temperature as the intake air temperature. The resistor 120 also tends to have a temperature difference due to heating due to self-heating, heat capacity of the resistor, and conduction of the lead wire 126 or the pillar. Therefore, the lead wire 126 or the pillar is made thin to reduce the influence of conduction. In addition, in order to reduce heat capacity, it is desirable to configure the resistor 120 with a thin wire (diameter of 0.1 m or less) and support it with a material with high thermal resistance such as a porous ceramic material. and dissipate it promptly.
吸入空気が冷却されると、抵抗１２０，１１８の外面セ
ンサ筒１１１の内表面に水分が付着する。When the intake air is cooled, moisture adheres to the inner surface of the outer sensor cylinder 111 of the resistors 120 and 118.
このため、上記の部分の温度は、吸入空気より常に高く
なっている。センサ筒１１１が吸入空気より早く冷却さ
れた場合、抵抗１２０．１１６が表面に付着した水分に
より１部分的に短絡することが考えられる。これを防止
するため、抵抗１２０゜１１６、リード線１１７，１２
６の一部、あるいは全部を絶縁性の被覆材で被覆し、抵
抗１２０゜１１６の端子間の電気抵抗を増大することが
できる０本発明によれば、正確な吸気量検出が可能とな
る。Therefore, the temperature of the above portion is always higher than that of the intake air. If the sensor tube 111 is cooled down faster than the intake air, it is possible that one portion of the resistor 120, 116 may be short-circuited due to moisture adhering to the surface. To prevent this, resistor 120°116, lead wires 117, 12
According to the present invention, it is possible to cover part or all of 6 with an insulating covering material to increase the electrical resistance between the terminals of the resistor 120. According to the present invention, it is possible to accurately detect the amount of intake air.
第１図は本発明を実施した内燃機関の吸気量検出装置の
全体構造の断面図、第２図は第１図の要部断面図、第３
図は本発明の一実施例を示す要部断面図である。
１１６．１２０・・・感温抵抗。FIG. 1 is a cross-sectional view of the overall structure of an intake air amount detection device for an internal combustion engine embodying the present invention, FIG. 2 is a cross-sectional view of the main part of FIG. 1, and FIG.
The figure is a sectional view of a main part showing an embodiment of the present invention. 116.120... Temperature sensitive resistance.
Claims (1)
り高い温度に保持される流速測定用の第１感温抵抗と、
この第１の感温抵抗と近接して前記吸入通路内に設置さ
れた吸入空気温度と同じ温度に保持される第２の感温抵
抗とを有し、上記第１の感温抵抗と第２の感温抵抗を空
気の流れ方向に対してずらして配置したことを特徴とす
る内燃機関の吸気量検出装置。1. a first temperature-sensitive resistor for measuring flow velocity that is maintained at a temperature higher than the intake air temperature and installed in the intake passage of the internal combustion engine;
A second temperature-sensitive resistor is provided in the vicinity of the first temperature-sensitive resistor and is maintained at the same temperature as the intake air temperature. An intake air amount detection device for an internal combustion engine, characterized in that a temperature-sensitive resistor is arranged offset with respect to the air flow direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60252751A JPS61137018A (en) | 1985-11-13 | 1985-11-13 | Apparatus for detecting air intake amount of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60252751A JPS61137018A (en) | 1985-11-13 | 1985-11-13 | Apparatus for detecting air intake amount of internal combustion engine |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12284478A Division JPS5549544A (en) | 1978-10-04 | 1978-10-04 | Detector of suction air quantity in internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61137018A true JPS61137018A (en) | 1986-06-24 |
Family
ID=17241774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60252751A Pending JPS61137018A (en) | 1985-11-13 | 1985-11-13 | Apparatus for detecting air intake amount of internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61137018A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4948893A (en) * | 1972-09-13 | 1974-05-11 |
-
1985
- 1985-11-13 JP JP60252751A patent/JPS61137018A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4948893A (en) * | 1972-09-13 | 1974-05-11 |
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