JPH01216247A - Fuel sensor for alcohol-blended fuel - Google Patents
Fuel sensor for alcohol-blended fuelInfo
- Publication number
- JPH01216247A JPH01216247A JP4146588A JP4146588A JPH01216247A JP H01216247 A JPH01216247 A JP H01216247A JP 4146588 A JP4146588 A JP 4146588A JP 4146588 A JP4146588 A JP 4146588A JP H01216247 A JPH01216247 A JP H01216247A
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- electrode
- sensor
- alcohol
- electrode member
- 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.)
- Granted
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 63
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 230000002093 peripheral effect Effects 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 8
- 238000002156 mixing Methods 0.000 abstract description 4
- 238000007789 sealing Methods 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 2
- 230000002950 deficient Effects 0.000 abstract 2
- 229920002313 fluoropolymer Polymers 0.000 abstract 1
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 230000005686 electrostatic field Effects 0.000 description 3
- 239000012212 insulator Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- -1 methanol Chemical compound 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発明は、ガソリンにアルコールを混合してなるアル
コール混合燃料の燃料成分つまりアルコール混合割合を
静電容量変化から検出するアルコール混合燃料用燃料セ
ンサに関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a fuel sensor for alcohol-mixed fuel that detects the fuel components of alcohol-mixed fuel, that is, the mixing ratio of alcohol, from changes in capacitance.
従来の技術
内燃機関の燃料としてガソリンにメタノール等のアルコ
ールを混合したアルコール混合燃料を使用することが従
来から試みられているが、種々の混合割合の燃料に内燃
機関を対応させるためには、使用燃料の混合割合を実際
に燃料センサにて検出し、それに応じて燃料供給ｇｉｔ
や点火時期等の補正が行われるように構成する必要があ
る。Conventional Technology Previous attempts have been made to use alcohol blended fuel, which is a mixture of gasoline and alcohol such as methanol, as fuel for internal combustion engines. The fuel mixture ratio is actually detected by the fuel sensor, and the fuel supply git is adjusted accordingly.
It is necessary to configure the system so that corrections such as ignition timing, etc. can be made.
このような目的で用いられる燃料センサとしては、例え
ば１９７７年アルコール燃料シンポジウムにおいて配布
されたＡＦＴペーパーに記載されている静電界１１を型
燃料センサが知られている。As a fuel sensor used for such a purpose, for example, an electrostatic field 11 type fuel sensor described in an AFT paper distributed at the 1977 Alcohol Fuel Symposium is known.
第４図は、この従来の燃料センサ３Ｉの構成を示すもの
で、円筒状をなすマイナス側の電極部材３２両端に燃料
通路接続管３３．３３がそれぞれ固設されているととも
に、その内部に円柱状のプラス側電極部材３４が絶縁体
３５を介して同心状に支持されている。これにより画電
極部材３２゜３４の間に環状間隙３６が形成されている
。また３７は上記マイナス側電極部材３２外表面に接合
されたマイナス側端子、３８は上記マイナス側電極部材
３２に絶縁体３９を介して取り付けられたプラス側端子
であって、このプラス側端子３８は、合成樹脂等からな
る絶縁体３９に螺合し、先端がプラス側電極部材３４に
当接して導通がなされている。FIG. 4 shows the configuration of this conventional fuel sensor 3I, in which fuel passage connecting pipes 33 and 33 are fixedly installed at both ends of the cylindrical negative side electrode member 32, and a circular A columnar positive electrode member 34 is supported concentrically with an insulator 35 in between. As a result, an annular gap 36 is formed between the picture electrode members 32 and 34. Further, 37 is a negative terminal joined to the outer surface of the negative electrode member 32, and 38 is a positive terminal attached to the negative electrode member 32 via an insulator 39. , is screwed onto an insulator 39 made of synthetic resin or the like, and its tip abuts against the positive electrode member 34 to establish electrical continuity.
このように構成された燃料センサ３１は、例えば燃料タ
ンクから機関へ向かう燃料通路中に介装され、上記環状
間隙３６を燃料が通流する。そして、画電極部材３２．
３４間の静電容量が燃料成分つまりアルコール混合割合
に応じて変化するので、これからアルコール混合割合が
検出されるのである。The fuel sensor 31 configured in this manner is interposed, for example, in a fuel passage leading from the fuel tank to the engine, and fuel flows through the annular gap 36. Then, the picture electrode member 32.
Since the capacitance between 34 changes depending on the fuel components, that is, the alcohol mixing ratio, the alcohol mixing ratio can be detected from this.
発明が解決しようとする課題
ところで、この燃料センサ３１が被検出体とするメタノ
ール等は導電性を有しているので、燃料に没しているプ
ラス側の電極部材３４や端子３８先端部において電食が
発生ずる。ここで上記従来の構成にあっては、プラス側
端子３８先端が電極部材３４に接触して導通が確保され
ているので、その接触部で特に電食が発生し易く、この
結果、接触不良による故障を生じる虞れかあった。Problems to be Solved by the Invention By the way, since methanol or the like that is detected by this fuel sensor 31 has conductivity, no electricity is generated at the tip of the positive electrode member 34 or terminal 38 submerged in the fuel. An eclipse will occur. In the above-mentioned conventional configuration, since the tip of the positive terminal 38 contacts the electrode member 34 to ensure continuity, electrical corrosion is particularly likely to occur at the contact portion, and as a result, due to poor contact. There was a risk of a malfunction occurring.
課題全解決するための手段
この兇明は、上記の課題を解決するためにプラス側の電
極部と端子部とを一体化して燃料中の接触部の除去を図
ったものである。すなわち、この発明に係るアルコール
混合燃料用燃料センサは、燃料通路の一部を構成するセ
ンサボディに、円筒状内周面を何するマイナス側の電極
部を形成し、かつ基端に端子部が一体に形成された電極
部材を１−記センサボディに絶縁性シール部材を介して
挿入固定して、該電極部材先端のプラス側電極部と上記
マイナス側電極部との間に燃料が通流する環状間隙を形
成し、両電極部間の静電界４１変化から燃料成分を検出
するようにしたものである。Means for Solving All Problems In order to solve the above-mentioned problems, this solution integrates the positive side electrode part and the terminal part to eliminate the contact part in the fuel. That is, the fuel sensor for alcohol mixed fuel according to the present invention has a negative electrode portion formed on the cylindrical inner circumferential surface of the sensor body constituting a part of the fuel passage, and a terminal portion at the base end. The integrally formed electrode member is inserted and fixed into the sensor body described in 1- above through an insulating seal member, and fuel flows between the positive electrode portion at the tip of the electrode member and the negative electrode portion. An annular gap is formed, and fuel components are detected from changes in the electrostatic field 41 between both electrode parts.
作用
り記構成では、プラス側の電極部と端子部とが一体とな
っており、電食の発生部位となる接触部が存在しない。In the working configuration, the positive side electrode portion and the terminal portion are integrated, and there is no contact portion that can cause electrolytic corrosion.
従って、電食による接触不良が防止される。Therefore, poor contact due to electrolytic corrosion is prevented.
実施例
第１図および第２図は、この発明に係る燃料センサｌの
一実施例を示している。尚、この燃料センサ１は、信号
処理回路２とともにケース３内に収納されている。Embodiment FIGS. 1 and 2 show an embodiment of a fuel sensor I according to the present invention. Note that this fuel sensor 1 is housed in a case 3 together with a signal processing circuit 2.
この燃料センサ１の中央部に位置する短円筒状のセンサ
ボディ４は、上部ボディ４ａおよび下部ボディ４ｂに２
分割して構成されており、少なくとも上部ボディ４ａが
導電性金属にて形成されている。また上記センサボディ
４は、内部に燃料通路部５を備えた中空状をなし、かつ
１８０°離れた位置に、燃料人口６および燃料用ロアを
備えている。この燃料人口６および燃料用ロアには、そ
れぞれ燃料通路接続管８．９が接続固定されている。そ
して、上記上部ボディ４ａと一体に、円筒状のマイナス
側電極部ｌＯが形成されている。この電極部１０は、燃
料通路部５内に位置し、かつ第２図に示すように該燃料
通路部５と同心状に形成されている。尚、上記上部ボデ
ィ４ａ自体をマイナス側の端子として信号処理回路２の
リード線１１の一方が結線されている。A short cylindrical sensor body 4 located at the center of the fuel sensor 1 has an upper body 4a and a lower body 4b.
It has a divided structure, and at least the upper body 4a is made of conductive metal. Further, the sensor body 4 has a hollow shape with a fuel passage portion 5 therein, and is provided with a fuel port 6 and a fuel lower at a position 180° apart. A fuel passage connecting pipe 8.9 is connected and fixed to the fuel port 6 and the fuel lower, respectively. A cylindrical negative electrode portion IO is formed integrally with the upper body 4a. This electrode section 10 is located within the fuel passage section 5, and is formed concentrically with the fuel passage section 5, as shown in FIG. Incidentally, one of the lead wires 11 of the signal processing circuit 2 is connected to the upper body 4a itself as a negative terminal.
また上記上部ボディ４ａの中心部、詳しくは上記マイナ
ス側電極部ｌＯの内周に沿って、円形のｌｌｒ通孔１２
が設けられており、ここにフッ素系樹脂等からなる絶縁
性シール部材１３．１４を介して棒状をなすプラス側の
電極部材Ｉ５が挿入固定されている。この電極部材！５
は、先端部に円柱状の電極部１６を有するとともに、基
端部に螺条が刻設された端子部１７を有し、かつ上記電
極部１６が上記マイナス側電極部ｌＯの中心部に配置さ
れている。これによって、両型極部１０．１６の間に、
燃料が通流する環状間隙１８が形成されている。尚、燃
料の円滑な通流を確保すべく、マイナス側電極部１０の
燃料人口６．燃料用ロアに対向した位置に小孔１９．２
０が形成されている。Further, a circular llr through hole 12 is located in the center of the upper body 4a, specifically along the inner circumference of the negative electrode portion
is provided, into which a rod-shaped positive electrode member I5 is inserted and fixed via insulating seal members 13 and 14 made of fluororesin or the like. This electrode member! 5
has a cylindrical electrode part 16 at the distal end and a terminal part 17 with a thread carved in the base end, and the electrode part 16 is arranged at the center of the negative side electrode part IO. has been done. As a result, between the two pole parts 10.16,
An annular gap 18 is formed through which fuel flows. In addition, in order to ensure smooth flow of fuel, the fuel population 6. Small hole 19.2 located opposite the fuel lower
0 is formed.
また上記端子部１７には、一対のナツト２１゜２２が螺
合し、これらを介して信号処理回路２のリード線ＩＩの
他方が結線されている。Further, a pair of nuts 21 and 22 are screwed into the terminal portion 17, and the other lead wire II of the signal processing circuit 2 is connected through these nuts.
ここで上記電極部材１５が取り付けられる貫通孔１２は
、その上部開口側が僅かに小径になっており、他方、電
極部材Ｉ５の電極部１６は端子部ｌ７よりも大径になっ
ている。そして、シール部材Ｉ３は、第３図に詳示する
ように、貫通孔１２の口径と同様に小径部１３ａおよび
大径部１３ｂを有している。従って、電極部材１５をシ
ール部材１３とともに貫通孔１２に下面側から挿入し、
かつシール部材１４を挟んでナツト２１を締め付けてや
れば、貫通孔１２の小径部１２ａと電極部１６との間で
シール部材１３が挟圧されて、電極部材１５が上部ボデ
ィ４ａに堅固に固定されるのである。また上記シール部
材１３は、小径部Ｉ３ユと大径部１３ｂとの間にテーパ
部１３ｃを有しており、これがナツト２１の締め付けに
伴って圧縮変形するので、非常に良好なシール性が確保
される。The through hole 12 to which the electrode member 15 is attached has a slightly smaller diameter on its upper opening side, while the electrode portion 16 of the electrode member I5 has a larger diameter than the terminal portion l7. As shown in detail in FIG. 3, the seal member I3 has a small diameter portion 13a and a large diameter portion 13b, which are similar to the diameter of the through hole 12. Therefore, the electrode member 15 is inserted into the through hole 12 from the bottom side together with the seal member 13,
When the nut 21 is tightened with the seal member 14 in between, the seal member 13 is compressed between the small diameter portion 12a of the through hole 12 and the electrode portion 16, and the electrode member 15 is firmly fixed to the upper body 4a. It will be done. Further, the seal member 13 has a tapered portion 13c between the small diameter portion I3 and the large diameter portion 13b, and this is compressed and deformed as the nut 21 is tightened, so that very good sealing performance is ensured. be done.
さて上記構成においては、プラス側の電極部材Ｉ５が全
体として一部材となっており、燃料中に没した部分に接
触部は存在しない。従って、燃料中の接触部において発
生し易い電食を防止でき、その電食による接触不良等の
不具合がない。また、両型極部１０．１６の相対位置が
、略円筒状をなずシール部材１３によって規制されるの
で、環状゛間隙１８を各部均一に確実に確保でき、検出
精度のばらつきを防止できる。そして、上記シール部材
＋３によって上述したように非常に優れたシール性が得
られ、燃料漏れを生じることがない。Now, in the above configuration, the positive side electrode member I5 is a single member as a whole, and there is no contact portion in the portion immersed in the fuel. Therefore, it is possible to prevent electrolytic corrosion that is likely to occur at the contact portion in the fuel, and there is no problem such as poor contact due to the electrolytic corrosion. Further, since the relative positions of the two pole portions 10.16 are not substantially cylindrical and are regulated by the seal member 13, the annular gap 18 can be ensured uniformly at each portion, and variations in detection accuracy can be prevented. Further, the seal member +3 provides extremely excellent sealing performance as described above, and no fuel leakage occurs.
尚、１−記のように信号処理回路２を燃料センサ！と同
一のケース３内に収納した構成によれば、高い周波数で
も精度良く静電界１１を測定できる利点がある。In addition, as described in 1-, the signal processing circuit 2 is used as a fuel sensor! According to the structure housed in the same case 3, there is an advantage that the electrostatic field 11 can be measured with high accuracy even at high frequencies.
発明の効果
以」−の説明で明らかなように、この発明に係るアルコ
ール混合燃料用燃料センサにおいては、プラス側の電極
部材が端子部をも含めて一体化されており、燃料中に従
来のような接触部が存在しないので、電食による接触不
良を防止できる。従って、耐久性、信頼性に優れた燃料
センサを提供することができる。As is clear from the explanation in ``Effects of the Invention'', in the fuel sensor for alcohol mixed fuel according to the present invention, the positive electrode member including the terminal part is integrated, and the conventional Since there are no such contact parts, poor contact due to electrolytic corrosion can be prevented. Therefore, a fuel sensor with excellent durability and reliability can be provided.
第１図はこの発明に係る燃料センサの一実施例を示す断
面図、第２図はその■−■線に沿った断面図、第３図は
そのシール部材の拡大断面図、第４図は従来における燃
料センサの一構成例を示す断面図である。
１・・・燃料センサ、４・・・センサボディ、ＩＯ・・
・マイナス側電極部、１３．１４・・・シール部材、１
５・・・プラス側電極部、材、１６・・・電極部、■７
・・・端子部、１８・・・環状間隙。
外２名
第２図
第３図
ＩＩＪ図FIG. 1 is a sectional view showing an embodiment of the fuel sensor according to the present invention, FIG. 2 is a sectional view taken along the line ■-■, FIG. 3 is an enlarged sectional view of the seal member, and FIG. FIG. 2 is a cross-sectional view showing an example of the configuration of a conventional fuel sensor. 1...Fuel sensor, 4...Sensor body, IO...
・Minus side electrode part, 13.14... Seal member, 1
5... Positive side electrode part, material, 16... Electrode part, ■7
...Terminal part, 18...Annular gap. 2 people Figure 2 Figure 3 Figure IIJ
Claims (1)
状内周面を有するマイナス側の電極部を形成し、かつ基
端に端子部が一体に形成された電極部材を上記センサボ
ディに絶縁性シール部材を介して挿入固定して、該電極
部材先端のプラス側電極部と上記マイナス側電極部との
間に燃料が通流する環状間隙を形成し、両電極部間の静
電容量変化から燃料成分を検出するようにしたアルコー
ル混合燃料用燃料センサ。(1) A negative electrode portion having a cylindrical inner peripheral surface is formed on the sensor body that constitutes a part of the fuel passage, and an electrode member having a terminal portion integrally formed at the base end is attached to the sensor body. The electrode member is inserted and fixed via an insulating seal member to form an annular gap through which fuel flows between the positive side electrode portion at the tip of the electrode member and the negative side electrode portion, and to reduce the capacitance between both electrode portions. A fuel sensor for alcohol mixed fuel that detects fuel components based on changes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63041465A JP2505847B2 (en) | 1988-02-24 | 1988-02-24 | Fuel sensor for alcohol blended fuel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63041465A JP2505847B2 (en) | 1988-02-24 | 1988-02-24 | Fuel sensor for alcohol blended fuel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01216247A true JPH01216247A (en) | 1989-08-30 |
| JP2505847B2 JP2505847B2 (en) | 1996-06-12 |
Family
ID=12609123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63041465A Expired - Lifetime JP2505847B2 (en) | 1988-02-24 | 1988-02-24 | Fuel sensor for alcohol blended fuel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2505847B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0360061U (en) * | 1989-10-16 | 1991-06-13 | ||
| JPH03216542A (en) * | 1990-01-23 | 1991-09-24 | Kobe Steel Ltd | Electrode for measuring electrostatic capacitance |
| JP2009505074A (en) * | 2005-08-08 | 2009-02-05 | コンチネンタル オートモーティヴ システムズ ユーエス，インコーポレイテッド | Fluid quality sensor |
| JP2011164085A (en) * | 2010-01-12 | 2011-08-25 | Denso Corp | Fuel alcohol concentration detector |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5757253A (en) * | 1980-09-25 | 1982-04-06 | Nissan Motor Co Ltd | Device for detecting alcohol blending ratio of alcohol blender gasoline |
-
1988
- 1988-02-24 JP JP63041465A patent/JP2505847B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5757253A (en) * | 1980-09-25 | 1982-04-06 | Nissan Motor Co Ltd | Device for detecting alcohol blending ratio of alcohol blender gasoline |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0360061U (en) * | 1989-10-16 | 1991-06-13 | ||
| JPH03216542A (en) * | 1990-01-23 | 1991-09-24 | Kobe Steel Ltd | Electrode for measuring electrostatic capacitance |
| JP2009505074A (en) * | 2005-08-08 | 2009-02-05 | コンチネンタル オートモーティヴ システムズ ユーエス，インコーポレイテッド | Fluid quality sensor |
| JP4881951B2 (en) * | 2005-08-08 | 2012-02-22 | コンチネンタル オートモーティヴ システムズ ユーエス，インコーポレイテッド | Sensor device for detecting fluid characteristics |
| JP2011164085A (en) * | 2010-01-12 | 2011-08-25 | Denso Corp | Fuel alcohol concentration detector |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2505847B2 (en) | 1996-06-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |