JPH0452679Y2 - - Google Patents
Info
- Publication number
- JPH0452679Y2 JPH0452679Y2 JP1985172591U JP17259185U JPH0452679Y2 JP H0452679 Y2 JPH0452679 Y2 JP H0452679Y2 JP 1985172591 U JP1985172591 U JP 1985172591U JP 17259185 U JP17259185 U JP 17259185U JP H0452679 Y2 JPH0452679 Y2 JP H0452679Y2
- Authority
- JP
- Japan
- Prior art keywords
- light
- gasoline
- sensor
- rod
- transparent body
- 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
Links
- 239000000203 mixture Substances 0.000 claims description 32
- 239000010410 layer Substances 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 20
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 239000004065 semiconductor Substances 0.000 claims description 5
- 239000011247 coating layer Substances 0.000 claims description 3
- 230000004907 flux Effects 0.000 claims description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 21
- 239000000446 fuel Substances 0.000 description 13
- 239000003502 gasoline Substances 0.000 description 11
- 238000002156 mixing Methods 0.000 description 11
- 238000002485 combustion reaction Methods 0.000 description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000010409 thin film Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 3
- 238000000151 deposition Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 238000004544 sputter deposition Methods 0.000 description 3
- 238000007740 vapor deposition Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
Description
【考案の詳細な説明】
［産業上の利用分野］
本考案は、内燃機関用燃料としてのガソリン〜
アルコール混合液の、ガソリン〜アルコール混合
比を検知するための光電変換型センサに関する。[Detailed explanation of the invention] [Industrial application field] The invention is based on the use of gasoline as a fuel for internal combustion engines.
The present invention relates to a photoelectric conversion sensor for detecting the gasoline-alcohol mixture ratio of an alcohol mixture.
［従来の技術］
人や物を移送する乗物を動かすために、また工
業製品の原料として、今や日常生活に不可欠の存
在となつている石油資源も将来確実に涸渇への一
途をたどる運命にある。対応策の一つとして極く
短時間を隔てて再生産が可能な植物や石炭、天然
ガス等を原料としてアルコールを製造し、ガソリ
ンと混用することによつて石油消費量を極力抑制
しようとする計画が各地で進められている。[Conventional technology] Petroleum resources, which are now indispensable to daily life as they are used to move vehicles that transport people and goods, and as raw materials for industrial products, are destined to be depleted in the future. . One countermeasure is to try to reduce oil consumption as much as possible by producing alcohol from plants, coal, natural gas, etc., which can be reproduced over short periods of time, and mixing it with gasoline. Plans are underway across the country.
［考案が解決しようとする問題点］
内燃機関、殊に自動車用エンジンの場合には、
上記の問題とも関連して極力燃焼効率を高めるた
めに、また有害な燃焼ガスによる人体への悪影響
をできるだけ少なくするために、エンジンシリン
ダ内に供給する混合気の空気対燃料の比率や点火
時期は特に厳密に制御する必要がある。そして燃
料の種類が異なる毎にこれらの制御条件は当然に
変更されなければならない。ガソリン〜アルコー
ル混合燃料の場合には、市場での使い勝手を考慮
すれば、混合燃料とガソリンとの混用も可能なシ
ステムとすることが望ましい。[Problems to be solved by the invention] In the case of internal combustion engines, especially automobile engines,
In connection with the above problem, in order to increase combustion efficiency as much as possible and to minimize the adverse effects of harmful combustion gases on the human body, the air-to-fuel ratio of the mixture supplied into the engine cylinder and the ignition timing are adjusted. Particularly strict control is required. Naturally, these control conditions must be changed each time the type of fuel differs. In the case of a gasoline-alcohol mixed fuel, considering ease of use in the market, it is desirable to have a system that allows mixed use of the mixed fuel and gasoline.
本考案は、内燃機関の燃料供給系に組み込んで
ガソリン〜アルコール混合比を連続的に計測し、
内燃機関の自動燃焼制御装置にフイードバツク制
御情報を供給するための、計測精度の向上された
ガソリン〜アルコール混合比センサを提供するこ
とを目的とする。 This invention is incorporated into the fuel supply system of an internal combustion engine to continuously measure the gasoline-alcohol mixture ratio.
An object of the present invention is to provide a gasoline-alcohol mixture ratio sensor with improved measurement accuracy for supplying feedback control information to an automatic combustion control device for an internal combustion engine.
［問題点を解決するための手段］
上記の目的を達成するために、両端部を把持用
部材で支持するとともに、外周面をガソリン〜ア
ルコ−ル混合液に接触させた、該混合液より屈折
率が大きい棒状透光体の、一方の端面に発光素子
を、他方の端面に受光素子を、これら三者の各々
の光束進行方向中心線を一致させるように取付け
てなる、ガソリン〜アルコール混合比センサにお
いて、前記把持用部材と前記棒状透光体との接触
界面に、前記棒状透光体より屈折率が大きい、金
属や半導体の被着層ないしは被覆層からなる光反
射層を設けた構成を採用した。[Means for Solving the Problems] In order to achieve the above object, both ends are supported by gripping members, and the outer peripheral surface is brought into contact with the gasoline-alcohol mixture. A light-emitting element is attached to one end face of a rod-shaped light-transmitting body with a large ratio, a light-receiving element is attached to the other end face, and the center line of each of these three members in the light flux traveling direction is aligned, and the gasoline-alcohol mixing ratio is obtained. In the sensor, a light reflecting layer made of a metal or semiconductor adhesion layer or coating layer having a higher refractive index than the rod-shaped transparent body is provided at the contact interface between the gripping member and the rod-shaped transparent body. Adopted.
［作用および考案の効果］
上記のごとき構成を備えたガソリン〜アルコー
ル混合比センサは、棒状透光体とその把持用部材
との接触界面に、金属や半導体の被着層ないしは
被覆層からなり、棒状透光体より屈折率が大きい
光反射層を設けることによつて、以下の作用効果
を奏する。[Operation and effects of the invention] The gasoline-alcohol mixture ratio sensor having the above-mentioned configuration includes an adhesion layer or a coating layer of metal or semiconductor on the contact interface between the rod-shaped transparent body and the gripping member, By providing a light reflecting layer having a higher refractive index than the rod-shaped light transmitting body, the following effects can be achieved.
発光素子から放射される光が、上記混合液とは
異なる光学的特性をもつた把持用部材方向に進む
際、透光体と混合液との接触界面に対してその臨
界角以上の角度をなして照射されるような入射角
の光ばかりでなく、全ての角度をなして照射され
るような入射角の光が全反射するので、ガソリン
〜アルコール混合液の混合比の変化に対する受光
素子の電気出力の直線的変化関係が、把持用部材
による光吸収現象によつて損われる不都合が生ぜ
ず、従つてセンサの計測精度は良好に保たれる。 When the light emitted from the light emitting element travels toward a gripping member that has optical characteristics different from those of the liquid mixture, it forms an angle greater than the critical angle with respect to the contact interface between the transparent body and the liquid mixture. Not only light at an angle of incidence that is irradiated at a certain angle, but also light at an angle of incidence that is irradiated at all angles is totally reflected. The linear change relationship of the output is not impaired by the light absorption phenomenon by the gripping member, and therefore the measurement accuracy of the sensor is maintained at a good level.
光反射層の形成に要するコストの上昇は微小で
あるのに対して、上記センサの計測精度向上によ
る内燃機関の運転効率の向上や排気ガスの浄化度
の向上に伴う効果は極めて大きい。 Although the increase in cost required to form the light-reflecting layer is small, the effects of improving the operational efficiency of the internal combustion engine and improving the degree of purification of exhaust gas due to the improved measurement accuracy of the sensor are extremely large.
［実施例］
以下に付図に示す実施例に基づいて本考案の具
体的な構成を説明する。[Example] The specific configuration of the present invention will be described below based on the example shown in the attached drawings.
第１図はガソリン〜アルコール混合比センサＡ
の側断面図であつて、ガラス製の棒状透光体１の
両端部は金属や合成樹脂などで作られた異経内空
部を備えた短筒形の把持用部材４または５の一端
側内空部に嵌合されている。そして把持用部材４
の他端側内空部には、発光素子としての発光ダイ
オード２がその発光部を棒状透光体１の一方の端
面１ａに対向させて各々の光束進行方向の中心線
が一致するよう嵌着されている。２ａと２ｂはダ
イオード２の入力端子である。また把持用部材５
の他端側内空部には、受光素子としてのホトダイ
オード３がその受光面を棒状透光体１の他方の端
面１ｂに対向させて各々の光束進行方向の中心線
が一致するように嵌着されている。３ａと３ｂは
ホトダイオード３の出力端子である。 Figure 1 shows gasoline-alcohol mixture ratio sensor A.
, in which both ends of a rod-shaped transparent body 1 made of glass are on one end side of a short cylindrical gripping member 4 or 5 with a different inner cavity made of metal, synthetic resin, etc. It is fitted into the inner cavity. and gripping member 4
A light-emitting diode 2 as a light-emitting element is fitted in the inner space on the other end side with its light-emitting part facing one end surface 1a of the rod-shaped transparent body 1 so that the center lines of the respective light flux traveling directions coincide with each other. has been done. 2a and 2b are input terminals of diode 2. Also, the gripping member 5
A photodiode 3 as a light-receiving element is fitted into the inner space on the other end side with its light-receiving surface facing the other end surface 1b of the rod-shaped transparent body 1 so that the center lines of the respective light beam traveling directions coincide with each other. has been done. 3a and 3b are output terminals of the photodiode 3.
棒状透光体１とその把持用部材４および５との
接触界面、この場合には透光体１の外周面には、
光反射層１０として銀その他の金属または酸化チ
タンなどの半導体を蒸着法、スパツタリング法、
メツキ法、或はペースト状材の塗布法等によつて
被着させた薄膜ないし厚膜層が設けられている。
或はこれらの材料からなるシート状材の被覆層で
あつてもよい。 At the contact interface between the rod-shaped transparent body 1 and its gripping members 4 and 5, in this case, on the outer peripheral surface of the transparent body 1,
As the light reflecting layer 10, silver or other metals or semiconductors such as titanium oxide are deposited by vapor deposition, sputtering,
A thin film or thick film layer is provided, which is deposited by a plating method, a paste-like material coating method, or the like.
Alternatively, it may be a covering layer of a sheet material made of these materials.
把持用部材４と５の間には、これら両部材の外
周面に掛け渡すようにして筒状ケーシング６が嵌
着されており、棒状透光体１と筒状ケーシング６
との間の円筒状閉鎖空間は、混合比を計測すべき
ガソリン〜アルコール混合液Ｃを棒状透光体１に
接触させるための混合液溜７としての役目を果た
す。筒状ケーシング６には被計測混合液の液入口
継手６ａと流出口継手６ｂが設けられている。ま
た把持用部材４と５の内壁面には、これら部材と
棒状透光体１との接触間隙から混合液Ｃが外界に
漏れ出ることを防ぐためのＯリング８のはめ込み
用溝４ａ，５ａを設けてある。 A cylindrical casing 6 is fitted between the gripping members 4 and 5 so as to span over the outer peripheral surfaces of these two members, and the rod-shaped transparent body 1 and the cylindrical casing 6
The cylindrical closed space between the two serves as a mixed liquid reservoir 7 for bringing the gasoline-alcohol mixed liquid C whose mixture ratio is to be measured into contact with the rod-shaped transparent body 1. The cylindrical casing 6 is provided with a liquid inlet joint 6a and an outlet joint 6b for the mixed liquid to be measured. Further, the inner wall surfaces of the gripping members 4 and 5 are provided with grooves 4a and 5a for fitting O-rings 8 to prevent the mixed liquid C from leaking to the outside from the contact gap between these members and the rod-shaped transparent body 1. It is provided.
第４図は電子制御式燃料噴射装置が組込まれた
自動車用エンジンの作動制御システム図であつ
て、４０はエンジンシリンダ、５０はエンジンの
キースイツチ、５１は制御回路、５５は車載バツ
テリ電源、２０は燃料タンク、Ａは本考案による
ガソリン〜アルコール混合比センサである。 FIG. 4 is a diagram of the operation control system of an automobile engine incorporating an electronically controlled fuel injection device, in which 40 is an engine cylinder, 50 is an engine key switch, 51 is a control circuit, 55 is an on-vehicle battery power supply, and 20 is an engine key switch. The fuel tank A is a gasoline-alcohol mixture ratio sensor according to the present invention.
燃焼系統の主要構成部品としての２１は燃料ポ
ンプ、２３はプレツシヤレギユレータ、２４はイ
ンジエクタ、２５はイグニツシヨンコイル、２６
はコールドスタートインジエクタであり、３０は
エアクリーナ、３１はエアバルブ、３２はエアフ
ローメータ、３３はスロツトルバルブ、３４はス
ロツトルポジシヨンセンサ、３５は吸気管、３６
は排気管である。また５２は酸素センサ、５３は
エンジン冷却水温センサである。 The main components of the combustion system are 21 a fuel pump, 23 a pressure regulator, 24 an injector, 25 an ignition coil, and 26
is a cold start injector, 30 is an air cleaner, 31 is an air valve, 32 is an air flow meter, 33 is a throttle valve, 34 is a throttle position sensor, 35 is an intake pipe, 36
is the exhaust pipe. Further, 52 is an oxygen sensor, and 53 is an engine cooling water temperature sensor.
次に上記実施例センサＡの作動について第１図
〜第４図を参照しながら説明する。エンジンのキ
ースイツチ５０をスタート位置にセツトすること
によつてエンジンが起動するとともに制御回路５
１への作動電力の供給が行われる。燃料タンク２
０に蓄えられているガソリンとアルコール（一般
にはメタノール）との任意の割合の混合液として
の燃料は、燃料ポンプ２１の働きによつて燃料配
管２２をたどつてインジエクタ２４に供給され
る。インジエクタ２４は制御回路５１の指示に従
つてその時々のエンジン運転条件に最も適した量
の混合液Ｃを吸気管３５内に向けて噴射させる。 Next, the operation of the above embodiment sensor A will be explained with reference to FIGS. 1 to 4. By setting the engine key switch 50 to the start position, the engine starts and the control circuit 5
1 is supplied with operating power. fuel tank 2
Fuel in the form of a mixture of gasoline and alcohol (generally methanol) in a desired ratio is supplied to an injector 24 through a fuel pipe 22 by the action of a fuel pump 21 . The injector 24 injects the liquid mixture C into the intake pipe 35 in an amount most suitable for the engine operating conditions at the time according to instructions from the control circuit 51.
混合比センサＡはこの燃料配管２２の途中に介
在させるようにしてその混合液流入口継手６ａと
流出口継手６ｂがそれぞれ配管２２に接続されて
いる。そして発光ダイオード２には制御回路５１
から電流が継続的に流されるので、発光ダイオー
ド２から放射された光は素子の発光面に対置され
ている棒状透光体１の一方の端面１ａから透光体
１内に侵入する。 The mixture ratio sensor A is interposed in the middle of the fuel pipe 22, and its mixed liquid inlet joint 6a and outlet joint 6b are connected to the pipe 22, respectively. The light emitting diode 2 has a control circuit 51.
Since a current is continuously passed through the light emitting diode 2, the light emitted from the light emitting diode 2 enters the light transmitting body 1 from one end surface 1a of the rod-shaped light transmitting body 1, which is placed opposite to the light emitting surface of the element.
透光体１は、第１図に描かれているように、混
合液Ｃが満たされている筒状ケーシング６内に納
められ、外周面が常に、屈折率が透光体１より小
さい関係にある混合液Ｃと接触状態にあるので、
透光体１と混合液Ｃとの接触界面に対して臨界角
以上の入射角でもつて一方の端面１ａから侵入し
た光は接触界面で全反射を繰り返しながら透光体
１の他方の端面１ｂに到達し、この端面に向けて
対置されているホトダイオード３の受光面を照射
するので、素子の出力端子３ａと３ｂ間には照射
光量に比例した出力が生ずる。 As depicted in FIG. 1, the transparent body 1 is housed in a cylindrical casing 6 filled with a liquid mixture C, and the outer peripheral surface always has a smaller refractive index than the transparent body 1. Since it is in contact with a certain mixed liquid C,
Light that enters the contact interface between the transparent body 1 and the mixed liquid C from one end surface 1a at an incident angle equal to or greater than the critical angle is repeatedly totally reflected at the contact interface and reaches the other end surface 1b of the transparent body 1. Since the light reaches the light-receiving surface of the photodiode 3 placed opposite to this end face, an output proportional to the amount of irradiated light is generated between the output terminals 3a and 3b of the element.
一方、上記の臨界角未満の小さな入射角をもつ
て侵入した光は、透光体１の外周面に到達した後
透光体１の外に逃げ出るので、ホトダイオード３
に出力を生ぜしめることには全く関与しない。 On the other hand, the light that enters with a small incident angle that is less than the above-mentioned critical angle escapes from the light transmitting body 1 after reaching the outer peripheral surface of the light transmitting body 1.
It is not involved in producing any output.
混合液Ｃとの接触界面における透光体１の臨界
角は混合液Ｃの構成成分であるガソリンとアルコ
ールの混合比の如何によつて当然に変化するので
発光ダイオード２から発した光のうち、透光体１
内で全反射を繰り返して（もつとも入射角によつ
ては唯一回全反射して）ホトダイオード３の受光
面に到達する光量の割合は、ガソリン〜アルコー
ル混合比の変動に伴つて変化することになる。従
つて、ホトダイオード３の出力とガソリン〜アル
コール混合比の関係データを予め実験的に求めて
おくことによつて、受光素子の出力をガソリン〜
アルコール混合比に換算した値として求めること
は電子回路を利用して容易に行うことができ、混
合比センサとしての機能が果される。 The critical angle of the transparent body 1 at the contact interface with the mixed liquid C naturally changes depending on the mixing ratio of gasoline and alcohol, which are the constituent components of the mixed liquid C. Translucent body 1
The ratio of the amount of light that reaches the light-receiving surface of the photodiode 3 after repeated total reflections (depending on the angle of incidence, only one total reflection depending on the incident angle) will change as the gasoline-alcohol mixture ratio changes. . Therefore, by experimentally determining the relationship data between the output of the photodiode 3 and the gasoline-alcohol mixture ratio, the output of the light-receiving element can be changed from gasoline to alcohol.
The value converted to the alcohol mixing ratio can be easily obtained using an electronic circuit, and functions as a mixing ratio sensor.
ところで、この実施例センサＡは、棒状透光体
１とその両端部に配置した把持用部材４または５
との接触界面に光反射層１０が設けられている。 By the way, this embodiment sensor A consists of a rod-shaped transparent body 1 and gripping members 4 or 5 disposed at both ends thereof.
A light reflecting layer 10 is provided at the contact interface with.
この光反射層１０を設けた理由を、第２図に示
した光反射層が設けられていない点を除いてセン
サＡと同一の構造を備えている別の混合比センサ
Ｂの側断面図を参照しながら説明する。 The reason for providing this light reflecting layer 10 will be explained with reference to the side cross-sectional view of another mixture ratio sensor B having the same structure as sensor A except that the light reflecting layer shown in FIG. 2 is not provided.
センサＢの透光体１に発光ダイオード２から入
射した光のうち、Ｏリング８が接触している個所
において、透光体１の外周面に混合液Ｃに対する
臨界角以上の入射角で到達した光は、Ｏリング８
が存在しなければ全反射させられるべきはずのも
のが、Ｏリング８に対する透光体１の臨界角が、
混合液Ｃに対する透光体１の臨界角より小さいた
めに、全反射されずにＯリング８に吸収されてし
まう現象が生ずるものである。第２図の破線ロは
Ｏリング８の存在によつて全反射されるべき光が
Ｏリング８に吸収される有り様を説明しており、
実線イは混合液Ｃとの接触界面に臨界角以上をも
つて照射された光は全反射させられる有り様を示
している。このように本来は全反射すべきはずの
入射角をもつて透光体の一方の端面１ａに入射し
た光が透光体の外側に持ち出されてしまう現象
は、光学的特性が混合液Ｃとは異なる把持用部材
４または５と透光体１との接触界面においても起
こることになる。 Of the light incident on the light transmitting body 1 of the sensor B from the light emitting diode 2, the light reaches the outer circumferential surface of the light transmitting body 1 at a point where the O ring 8 is in contact with the light transmitting body 1 at an incident angle equal to or higher than the critical angle for the mixed liquid C. The light is O-ring 8
The critical angle of the light-transmitting body 1 with respect to the O-ring 8 is
Since the angle is smaller than the critical angle of the transparent body 1 with respect to the liquid mixture C, a phenomenon occurs in which the light is absorbed by the O-ring 8 without being totally reflected. The broken line B in FIG. 2 explains how light that should be totally reflected due to the presence of the O-ring 8 is absorbed by the O-ring 8.
The solid line A shows how the light irradiated to the contact interface with the mixed liquid C with an angle equal to or greater than the critical angle is totally reflected. This phenomenon in which the light incident on one end surface 1a of the transparent body at an incident angle that should have been totally reflected is carried out to the outside of the transparent body is due to the optical characteristics of the mixed liquid C. This also occurs at the contact interface between the different gripping members 4 or 5 and the transparent body 1.
透光体１に上述のような変則的な光の屈折現象
が起これば、ホトダイオード３の出力と発光ダイ
オード２から放射される光量との間の比例関係に
も乱れが生ぜざるを得ない。一種の光電変換型セ
ンサとしての混合比センサＡにとつて、入射光量
と電気出力との間に直線的比例関係が保たれるこ
とはセンサの計測精度を確保する上から極めて重
要である。 If the above-described irregular light refraction phenomenon occurs in the transparent body 1, the proportional relationship between the output of the photodiode 3 and the amount of light emitted from the light emitting diode 2 will inevitably be disturbed. For the mixture ratio sensor A, which is a type of photoelectric conversion type sensor, it is extremely important to maintain a linear proportional relationship between the amount of incident light and the electrical output in order to ensure the measurement accuracy of the sensor.
そこで本願考案者は透光体の把持用部材４と５
およびＯリング８による好ましくない光学的影響
力を排除するための手段として、透光体１とその
把持用部材４および５との接触界面に光反射層１
０を設ける方法を着想するに至つたものである。 Therefore, the inventor of the present application has developed the gripping members 4 and 5 of the transparent body.
As a means for eliminating undesirable optical influences caused by the O-ring 8, a light reflecting layer is placed on the contact interface between the transparent body 1 and its gripping members 4 and 5.
This led to the idea of a method for setting 0.
光反射層１０の形成方法としては透光体１の両
端部分外周面に、スパツタリング法、蒸着法或は
電気的または化学的メツキ法などによつて薄膜層
を被着させるか、酸化チタンなどの半導体や金属
の粉末を主成分とするコーテイング材を塗布して
比較的厚い塗膜を設ける方法などが可能である。
或は光反射性を有するフイルム状板ないし板材を
巻きつけてもよい。把持用部材４および５側に光
反射量１０を設けることもできる。 The light reflecting layer 10 can be formed by depositing a thin film layer on the outer peripheral surface of both end portions of the light transmitting body 1 by sputtering, vapor deposition, electrical or chemical plating, or by depositing a thin film layer on the outer peripheral surface of both end portions of the light transmitting body 1, or by depositing a thin film layer on the outer circumferential surface of both end portions of the light transmitting body 1 by a sputtering method, a vapor deposition method, an electrical or chemical plating method, or the like. Possible methods include applying a coating material mainly composed of semiconductor or metal powder to form a relatively thick coating.
Alternatively, a film-like plate or a plate material having light reflecting properties may be wrapped around it. A light reflection amount of 10 can also be provided on the gripping members 4 and 5 side.
本考案による上記実施例センサＡと光反射層を
有しない上記の比較用混合比センサＢとについ
て、各々の出力特性を比べた実験データを第３図
に示した。 FIG. 3 shows experimental data comparing the output characteristics of the above-mentioned Example Sensor A according to the present invention and the above-mentioned Comparative Mixing Ratio Sensor B having no light reflecting layer.
縦軸にサンセの電気出力が、横軸に混合比を計
測すべきガソリン〜アルコール（メタノール）混
合液Ｃ中のメタノール混入率がとられている。 The vertical axis represents the electrical output of the sansé, and the horizontal axis represents the mixing ratio of methanol in the gasoline-alcohol (methanol) mixture C, the mixing ratio of which is to be measured.
尚、本願考案において、棒状透光体２の屈折率
（1.52）＞ガソリンの屈折率（1.43）＞メタノール
の屈折率（1.33）であるので、ガソリン100％及
びメタル100％の場合の臨界角θ1，θ2は、以下式
により、それぞれ、70°、61°となる。 In addition, in the present invention, since the refractive index of the rod-shaped transparent body 2 (1.52) > the refractive index of gasoline (1.43) > the refractive index of methanol (1.33), the critical angle θ in the case of 100% gasoline and 100% metal 1 and θ 2 are 70° and 61°, respectively, according to the following equations.
Sinθ1＝1.43／1.52≒0.94
Sinθ2＝1.33／1.52≒0.875
つまり、ガソリン中のメタノール混入率が大き
い程、臨界角が小さいので、発光ダイオードから
放射された光の内、透光体１と混合液Ｃとの接触
界面で全反射してホトダイオード３に到達する割
合が増加し、ホトダイオード３への受光量が多く
なり、第３図に示すように出力が増加する
グラフ(イ)はセンサＡについて、またグラフ(ロ)は
センサＢについて描かれたものであつて、光反射
層１０を備えた本考案センサＡはメタノール混入
率の変化に対してホトダイオード３の出力はほぼ
直線関係を保つて追従変化しているのに対して、
光反射層１０を有しないセンサＢの示すグラフ(ロ)
はかなり直線性が損われており、従つてセンサＢ
はセンサＡに比べてガソリン〜アルコール混合液
Ｃの混合比検出精度がかなり劣つているものと解
することができる。 Sinθ 1 = 1.43/1.52≒0.94 Sinθ 2 = 1.33/1.52≒0.875 In other words, the greater the methanol mixing rate in gasoline, the smaller the critical angle, so that more of the light emitted from the light emitting diode is mixed with the transparent material 1. The rate of total reflection at the contact interface with liquid C and reaching photodiode 3 increases, the amount of light received by photodiode 3 increases, and the output increases as shown in Figure 3. Graph (a) is for sensor A. , graph (b) is drawn for sensor B, and shows that in sensor A of the present invention, which is equipped with a light reflecting layer 10, the output of the photodiode 3 follows changes in the methanol mixing rate while maintaining an almost linear relationship. While it is changing,
Graph (b) shown by sensor B without light reflective layer 10
The linearity of sensor B is considerably impaired, so sensor B
It can be understood that the detection accuracy of the mixture ratio of gasoline to alcohol mixture C is considerably inferior to that of sensor A.
第１図は本考案によるガソリン〜アルコール混
合比センサの側断面図、第２図は光反射層を有し
ない点を除いて第１図のセンサと同一の構造を備
えたセンサの側断面図、第３図は第１図と第２図
にそれぞれ示されたセンサについて実測したガソ
リン中のメタノール混入率対出力グラフの比較
図、第４図は混合比センサが組込まれた自動車エ
ンジン用電子制御式燃料噴射装置の制御システム
図である。
図中、Ａ……ガソリン〜アルコール混合比セン
サ、Ｃ……ガソリン〜アルコール混合液、１……
棒状透光体、２……発光ダイオード（発光素子）、
３……ホトダイオード（受光素子）、４，５……
把持用部材、１０……光反射層。
FIG. 1 is a side sectional view of a gasoline-alcohol mixture ratio sensor according to the present invention, and FIG. 2 is a side sectional view of a sensor having the same structure as the sensor in FIG. 1 except that it does not have a light reflecting layer. Figure 3 is a comparison graph of methanol mixing ratio in gasoline versus output measured using the sensors shown in Figures 1 and 2, respectively. Figure 4 is an electronically controlled automobile engine type with a built-in mixture ratio sensor. It is a control system diagram of a fuel injection device. In the figure, A...Gasoline-alcohol mixture ratio sensor, C...Gasoline-alcohol mixture, 1...
Rod-shaped transparent body, 2... Light emitting diode (light emitting element),
3...Photodiode (light receiving element), 4, 5...
Gripping member, 10... light reflecting layer.
Claims (1)
面をガソリン〜アルコ−ル混合液に接触させた、
該混合液より屈折率が大きい棒状透光体の、一方
の端面に発光素子を、他方の端面に受光素子を、
これら三者の各々の光束進行方向中心線を一致さ
せるように取付けてなる、ガソリン〜アルコール
混合比センサにおいて、 前記把持用部材と前記棒状透光体との接触界面
に、前記棒状透光体より屈折率が大きい、金属や
半導体の被着層ないしは被覆層からなる光反射層
を設けたことを特徴とするガソリン〜アルコール
混合比センサ。[Claims for Utility Model Registration] Both ends are supported by gripping members, and the outer peripheral surface is in contact with the gasoline-alcohol mixture.
A light-emitting element is placed on one end surface of a rod-shaped transparent body having a refractive index higher than that of the liquid mixture, and a light-receiving element is placed on the other end surface.
In the gasoline-alcohol mixture ratio sensor, which is installed so that the center lines of the light flux traveling direction of each of these three members coincide with each other, a contact interface between the gripping member and the rod-shaped light-transmitting member is provided with a light-transmitting rod, A gasoline-alcohol mixture ratio sensor comprising a light reflecting layer made of a metal or semiconductor adhesion layer or coating layer having a high refractive index.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985172591U JPH0452679Y2 (en) | 1985-11-08 | 1985-11-08 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985172591U JPH0452679Y2 (en) | 1985-11-08 | 1985-11-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6281047U JPS6281047U (en) | 1987-05-23 |
| JPH0452679Y2 true JPH0452679Y2 (en) | 1992-12-10 |
Family
ID=31109267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985172591U Expired JPH0452679Y2 (en) | 1985-11-08 | 1985-11-08 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0452679Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5751920A (en) * | 1980-07-15 | 1982-03-27 | Tno | Fuel feeding system of combustion engine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56170754U (en) * | 1981-04-30 | 1981-12-17 |
-
1985
- 1985-11-08 JP JP1985172591U patent/JPH0452679Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5751920A (en) * | 1980-07-15 | 1982-03-27 | Tno | Fuel feeding system of combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6281047U (en) | 1987-05-23 |
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