JPH0547779B2 - - Google Patents
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- Publication number
- JPH0547779B2 JPH0547779B2 JP12140788A JP12140788A JPH0547779B2 JP H0547779 B2 JPH0547779 B2 JP H0547779B2 JP 12140788 A JP12140788 A JP 12140788A JP 12140788 A JP12140788 A JP 12140788A JP H0547779 B2 JPH0547779 B2 JP H0547779B2
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- Prior art keywords
- alcohol
- alcohol concentration
- electrodes
- current
- potential difference
- Prior art date
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Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、アルコールを混合した液体中のアル
コール濃度を高精度に検出できる電位差式アルコ
ールセンサに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a potentiometric alcohol sensor that can detect alcohol concentration in a liquid containing alcohol with high accuracy.
近時、諸外国ではガソリン中にアルコールを混
合したアルコール混合ガソリンがいわゆる「ガソ
ホール」として使用されている。純正ガソリンと
ガソホールとでは当然にオクタン価が異なるか
ら、純正ガソリンでは空燃比（空気と燃料の重量
比）Ａ／Ｆが15：１であるのに対し、ガソホール
の空燃比は第９図に示す特性となり、アルコール
濃度が100では空燃比は６：１となる。従つて、
ガソホールを使用する場合には、アルコール濃度
を検出して燃料噴射量、点火時期等を制御する必
要がある。
Recently, in various countries, alcohol-mixed gasoline, which is a mixture of alcohol and gasoline, has been used as so-called "gasohol." Since genuine gasoline and gasohol naturally have different octane ratings, the air-fuel ratio (weight ratio of air and fuel) A/F of genuine gasoline is 15:1, whereas the air-fuel ratio of gasohol has the characteristics shown in Figure 9. Therefore, if the alcohol concentration is 100, the air-fuel ratio will be 6:1. Therefore,
When using gasohol, it is necessary to detect the alcohol concentration and control the fuel injection amount, ignition timing, etc.
このため、従来からガソリン中のアルコール濃
度を検出するアルコールセンサとして、ガソリン
抵抗値とアルコールの抵抗値の相違からアルコー
ル濃度を検出する抵抗式アルコールセンサが検討
されている。 For this reason, as an alcohol sensor for detecting the alcohol concentration in gasoline, a resistance-type alcohol sensor that detects the alcohol concentration from the difference between the gasoline resistance value and the alcohol resistance value has been studied.
この種の抵抗式アルコールセンサを第１０図な
いし第１３図に示す。 This type of resistive alcohol sensor is shown in FIGS. 10 to 13.
同図において、１は燃料パイプ、２はアルコー
ルセンサで、該アルコールセンサ２は燃料パイプ
１内に離間して配設した一対の電極棒、電極板等
からなる電極３，４と、該電極３，４と接続され
た検出回路５とからなり、該検出回路５は一側電
極３と接続された直流電源６と、該直流電源６と
他側電極４間に設けられた検出抵抗７とから構成
されている（第１０図、第１１図参照）。 In the figure, 1 is a fuel pipe, and 2 is an alcohol sensor. , 4, and the detection circuit 5 includes a DC power supply 6 connected to the electrode 3 on one side, and a detection resistor 7 provided between the DC power supply 6 and the electrode 4 on the other side. (See Figures 10 and 11).
そして、上記アルコールセンサ２は一対の電極
３，４間に介在するガソリン中のアルコール濃度
Ｃが高くなると、抵抗値が低下することに基づき
（第１２図参照）、検出抵抗７の両端からの検出電
圧Ｅによりアルコール濃度Ｃ検出するものであ
る。 The alcohol sensor 2 uses detection from both ends of the detection resistor 7 based on the fact that the resistance value decreases as the alcohol concentration C in the gasoline interposed between the pair of electrodes 3 and 4 increases (see FIG. 12). Alcohol concentration C is detected by voltage E.
〔発明が解決しようとする課題〕
ところで、一般に電解装置にあつては電極にイ
オンが蓄積する分極効果と、イオンの動きに抵抗
力を与える緩和効果が表われることが広く知られ
ているが、アルコール混合ガソリン中に一対の電
極３，４を浸漬して通電することにより該アルコ
ール混合ガソリン中のアルコール濃度Ｃを検出す
る抵抗式アルコールセンサにおいても、アルコー
ル濃度が高くなると分極効果と緩和効果とによつ
て電極３，４の電気伝導度が失われ、小さくなる
現象が生じる。[Problems to be Solved by the Invention] By the way, it is widely known that electrolytic devices generally have a polarization effect in which ions accumulate on the electrodes and a relaxation effect that provides resistance to the movement of ions. Even in a resistive alcohol sensor that detects the alcohol concentration C in alcohol-mixed gasoline by immersing a pair of electrodes 3 and 4 in alcohol-mixed gasoline and applying electricity, polarization and relaxation effects occur as the alcohol concentration increases. As a result, the electrical conductivity of the electrodes 3 and 4 is lost and reduced.
このため、アルコール濃度Ｃが高くなると検出
抵抗７間の出力電圧Ｅが高くなるべきところ、分
極効果、緩和効果のためにアルコール濃度Ｃが高
い領域で出力電圧Ｅが低下してしまう。 Therefore, when the alcohol concentration C increases, the output voltage E across the detection resistor 7 should increase, but due to the polarization effect and relaxation effect, the output voltage E decreases in the region where the alcohol concentration C is high.
かくして、検出抵抗７間の出力電圧Ｅが第１３
図に示すように、アルコールの高濃度側で急激に
低下する現象が生じ、電圧特性全体としてある濃
度（EO）以上では同一アルコール濃度Ｃに対し
て２値（C1，C2）を持つことになり、アルコー
ル濃度Ｃを正確に検出できないという問題があ
る。 Thus, the output voltage E across the detection resistor 7 becomes
As shown in the figure, a phenomenon occurs where the alcohol decreases rapidly on the high concentration side, and the voltage characteristics as a whole have two values (C 1 , C 2 ) for the same alcohol concentration C above a certain concentration (E O ). Therefore, there is a problem that the alcohol concentration C cannot be detected accurately.
本発明は上述した従来技術の欠点に鑑みなされ
たもので、アルコール混合ガソリン中のアルコー
ル濃度を分極効果や緩和効果の影響を受けること
なく高精度に検出できるようにした電位差式アル
コールセンサを提供するものである。 The present invention has been made in view of the above-mentioned drawbacks of the prior art, and provides a potentiometric alcohol sensor that can detect the alcohol concentration in alcohol-mixed gasoline with high accuracy without being influenced by polarization effects or relaxation effects. It is something.
上述した課題を解決するために、本発明が採用
する構成は、アルコール混合液体中に離間して対
向配設され、一定の電圧が印加されるようになつ
た一対の通電用電極と、該一対の通電用電極間に
位置して所定間隔離間して対向配設された一対の
検出用電極とからなり、前記一対の通電用電極間
の距離はアルコール濃度に比例して該通電用電極
間の電位差が大きくなる範囲に設定し、前記一対
の検出用電極は該通電用電極間においてアルコー
ル濃度に比例して検出電位差が大きくなる範囲に
配設するようにしたことにある。
In order to solve the above-mentioned problems, the configuration adopted by the present invention includes: a pair of current-carrying electrodes that are spaced apart and facing each other in an alcohol mixed liquid and to which a constant voltage is applied; A pair of detection electrodes are located between the current-carrying electrodes and are arranged facing each other with a predetermined distance between them, and the distance between the pair of current-carrying electrodes is proportional to the alcohol concentration. The detection potential difference is set in a range where the potential difference becomes large, and the pair of detection electrodes are disposed between the current-carrying electrodes in a range where the detection potential difference becomes large in proportion to the alcohol concentration.
一対の通電用電極間の距離をその電位差が分極
効果によりアルコール濃度に比例して大きくなる
範囲に配設し、当該通電用電極間に位置して一対
の検出用電極を設け、該検出用電極間の距離をア
ルコール濃度に応じて検出電位差が大きくなる範
囲に設定することにより、該検出用電極によつて
アルコール濃度に比例した直線性のある電位差を
検出することができる。
The distance between the pair of current-carrying electrodes is arranged within a range where the potential difference increases in proportion to the alcohol concentration due to the polarization effect, and a pair of detection electrodes are provided between the current-carrying electrodes, and the detection electrode By setting the distance between them within a range in which the detected potential difference increases according to the alcohol concentration, the detection electrode can detect a linear potential difference that is proportional to the alcohol concentration.
以下、本発明の実施例を第１図ないし第８図に
基づき詳述する。
Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 8.
図において、１１，１２は燃料パイプ１（第１
０図参照）内に距離Ｌだけ離間して配設した一対
の電極板からなる通電用電極で、一側の通電用電
極１１は直流電源１３と接続され、他側の通電用
電極１２は固定抵抗１４を介して該直流電源１３
と接続されている。 In the figure, 11 and 12 are fuel pipes 1 (first
A current-carrying electrode consisting of a pair of electrode plates spaced apart by a distance L within a space (see Fig. The DC power supply 13 via the resistor 14
is connected to.
１５，１６はこれらの間に介在するガソリンの
電位差を測定するため、前記一対の電極１１，１
２間に設けられた他の一対の小形の電極板からな
る検出用電極で、該各検出用電極１５，１６は通
電用電極１１，１２から所定間隔離間し、かつ、
互に距離ｌだけ離間した状態で対向配設されてい
る。 15 and 16 are the pair of electrodes 11 and 1, in order to measure the potential difference of the gasoline interposed between them.
A detection electrode consisting of another pair of small electrode plates provided between the two, each of the detection electrodes 15 and 16 being separated from the current-carrying electrodes 11 and 12 by a predetermined distance, and
They are arranged facing each other and spaced apart by a distance l.
１７は前記一対の検出用電極１５，１６間の電
位差を検出するために、該検出用電極１５，１６
間に接続された電圧検出装置である。 Reference numeral 17 indicates the detection electrodes 15 and 16 in order to detect the potential difference between the pair of detection electrodes 15 and 16.
A voltage detection device is connected between the two.
叙上の如く、実施例のアルコールセンサは一対
の通電用電極１１，１２と、これらの間に設けら
れた他の一対の検出用電極１５，１６とを有して
いるが、ここで、この種の電位差式アルコールセ
ンサの基本的作動について説明する。 As mentioned above, the alcohol sensor of the embodiment has a pair of current-carrying electrodes 11 and 12 and another pair of detection electrodes 15 and 16 provided between them. The basic operation of a potentiometric alcohol sensor will be explained.
各一対の通電用電極１１，１２及び検出用電極
１５，１６は燃料パイプ１内のアルコール混合ガ
ソリン中に浸漬されており、この状態で通電用電
極１１，１２間に直流電源１３から一定の電圧を
印加する。この時、通電用電極１１，１２間に介
在するアルコール混合ガソリン中のアルコール濃
度Ｃが高いと、抵抗値は小さいから該電極１１，
１２間の電位差は小さくなり、逆にアルコール濃
度Ｃが低いと、抵抗値は大きいから電極１１，１
２間の電位差は大きくなる。 Each pair of current-carrying electrodes 11, 12 and detection electrodes 15, 16 are immersed in alcohol-mixed gasoline in the fuel pipe 1, and in this state, a constant voltage is applied between the current-carrying electrodes 11, 12 from the DC power source 13. Apply. At this time, if the alcohol concentration C in the alcohol-mixed gasoline interposed between the current-carrying electrodes 11 and 12 is high, the resistance value is small, so the electrodes 11 and 12
The potential difference between electrodes 11 and 12 becomes small, and conversely, when the alcohol concentration C is low, the resistance value is large, so electrodes 11 and 1
The potential difference between the two becomes large.
そこで、通電用電極１１，１２間に介装した一
対の検出用電極１５，１６により、該通電用電極
１１，１２間の電位差を電圧検出装置１７で電圧
検出することにより、アルコール濃度が高くなる
と出力電圧が直線的に小さくなるような電圧特性
を得ることができ、これによりアルコール濃度を
測定するようになつている。 Therefore, by detecting the potential difference between the current-carrying electrodes 11 and 12 using a voltage detection device 17 using a pair of detection electrodes 15 and 16 interposed between the current-carrying electrodes 11 and 12, the alcohol concentration increases. A voltage characteristic in which the output voltage decreases linearly can be obtained, and alcohol concentration can be measured based on this voltage characteristic.
ところで、前述の如く通電用電極１１，１２間
に直流電源１３から一定の電圧EVを印加すると、
該通電用電極１１，１２間の電圧Vt及び固定抵
抗１４の両端間電圧Ｅは理論的には第３図に示す
ようになる。従つて、第４図に示すように、アル
コール濃度Ｃに対する通電用電極１１，１２間の
差電圧はアルコール濃度Ｃ＝100のときの電位差
V1が最小、アルコール濃度Ｃ＝60のときの電位
差V2が中間、アルコール濃度Ｃ＝40のときに電
位差V3が最大になる。 By the way, as mentioned above, when a constant voltage E V is applied from the DC power supply 13 between the current-carrying electrodes 11 and 12,
The voltage Vt between the current-carrying electrodes 11 and 12 and the voltage E across the fixed resistor 14 are theoretically as shown in FIG. Therefore, as shown in FIG. 4, the voltage difference between the current-carrying electrodes 11 and 12 with respect to the alcohol concentration C is the potential difference when the alcohol concentration C=100.
When V 1 is the minimum, the potential difference V 2 is intermediate when the alcohol concentration C=60, and the potential difference V 3 is the maximum when the alcohol concentration C=40.
然るに、通電用電極１１，１２には直流電源１
３から電圧EVが印加されるから、該各電極１１，
１２には従来技術における電極３，４と同様に分
極効果と緩和効果とが表われる。このため、アル
コール濃度Ｃの高濃度領域、例えば80％以上の領
域では、各通電用電極１１，１２の電気伝導度が
失われて小さくなる結果、第５図に示すようにア
ルコール濃度Ｃに反比例的に減少する電極１１，
１２間の電圧Vtが高濃度領域では立上る現象が
生じる。 However, the DC power supply 1 is connected to the current-carrying electrodes 11 and 12.
Since voltage E V is applied from 3, each electrode 11,
Similar to the electrodes 3 and 4 in the prior art, the polarization effect and relaxation effect appear in the electrode 12. Therefore, in a high concentration region of alcohol concentration C, for example, in a region of 80% or more, the electrical conductivity of each current-carrying electrode 11, 12 is lost and becomes small, and as a result, it is inversely proportional to alcohol concentration C, as shown in FIG. electrode 11,
A phenomenon occurs in which the voltage Vt between 12 and 12 rises in a high concentration region.
かくして、一対の通電用電極１１，１２間にお
ける各アルコール濃度毎の電位差V1，V2，V3は
電極１１，１２近傍で分極効果の影響を強く受け
る結果、傾きの直線性が失われることになり、し
かも、分極効果はアルコール濃度Ｃが高濃度にな
るほど増加するため、第６図に示すようにアルコ
ール濃度Ｃ＝100の場合の電位差V1がアルコール
濃度Ｃ＝60、Ｃ＝40の場合の各電位差V2，V3に
対して逆転し、アルコール濃度Ｃ＝60の場合の電
位差V2が低濃度Ｃ＝40の電位差V3に逆転して大
きくなる。このため、検出用電極１５，１６を通
電用電極１１，１２間に単に配設した構成では、
アルコール濃度Ｃを正確に検出できないという不
具合がある。 Thus, the potential differences V 1 , V 2 , V 3 for each alcohol concentration between the pair of current-carrying electrodes 11 and 12 are strongly influenced by the polarization effect near the electrodes 11 and 12, and as a result, the linearity of the slope is lost. Moreover, since the polarization effect increases as the alcohol concentration C becomes higher, as shown in Fig. 6, the potential difference V 1 when the alcohol concentration C=100 is the same as when the alcohol concentration C=60 and C=40. The potential difference V 2 at the alcohol concentration C= 60 is reversed to the potential difference V 3 at the low concentration C=40 and becomes large . Therefore, in a configuration in which the detection electrodes 15 and 16 are simply arranged between the current-carrying electrodes 11 and 12,
There is a problem that the alcohol concentration C cannot be detected accurately.
そこで、実施例では各アルコール濃度Ｃ毎の電
位差V1，V2，V3が通電用電極１１，１２間の全
域で分極効果の影響を受けるように、通電用電極
１１，１２間の距離ＬはL′に設定してある。これ
により、アルコール濃度Ｃ＝100のときの電位差
V1がアルコール濃度Ｃ＝60のときの電位差V2に
対してＡ点で逆転し、電位差V2がアルコール濃
度Ｃ＝40のときの電位差V3に対してＢ点で逆転
し、各電位差がV1＞V2＞V3の関係になるように
してある。 Therefore, in the embodiment, the distance L between the current-carrying electrodes 11 and 12 is adjusted so that the potential differences V 1 , V 2 , and V 3 for each alcohol concentration C are affected by the polarization effect in the entire area between the current-carrying electrodes 11 and 12. is set to L′. As a result, the potential difference when the alcohol concentration C = 100 is
V 1 is reversed at point A with respect to potential difference V 2 when alcohol concentration C = 60, and potential difference V 2 is reversed at point B with respect to potential difference V 3 when alcohol concentration C = 40, and each potential difference is The relationship is set such that V 1 > V 2 > V 3 .
また、上述の如く配設した一対の通電用電極１
１，１２間に介在するガソリンの電位差V1，V2，
V3を検出する一対の検出用電極１５，１６は前
述の如く通電用電極１１，１２間で各電位差V1，
V2，V3が逆転したＡ点及びＢ点よりも外側、即
ち通電用電極１１，１２寄りに位置するように、
検出用電極１５，１６間の距離ｌはl′に設定して
ある。 In addition, a pair of current-carrying electrodes 1 arranged as described above are provided.
The potential difference of gasoline between 1 and 12 V 1 , V 2 ,
A pair of detection electrodes 15 and 16 for detecting V 3 have respective potential differences V 1 and 16 between current-carrying electrodes 11 and 12 as described above.
So that V 2 and V 3 are located outside the reversed points A and B, that is, closer to the current-carrying electrodes 11 and 12,
The distance l between the detection electrodes 15 and 16 is set to l'.
上記の各距離L′，l′を具体的に示すと、各通電
用電極１１，１２の電極面積を100mm2、直流電源
１３の電圧EV＝12Vとした場合、通電用電極１
１，１２間の距離L′はL′＝15mm、検出用電極１
５，１６間の距離l′はl′＝12mmである。 Specifically showing each distance L', l' above, when the electrode area of each current-carrying electrode 11, 12 is 100 mm 2 and the voltage E V of the DC power supply 13 is 12V, the current-carrying electrode 1
The distance L′ between 1 and 12 is L′=15mm, detection electrode 1
The distance l' between 5 and 16 is l'=12 mm.
かくして、実施例によれば一対の通電用電極１
１，１２間に介在するガソリンの電位差Ｖは、該
通電用電極１１，１２の分極効果に拘らず一対の
検出用電極１５，１６によつて第８図に示すよう
に、アルコール濃度Ｃに比例した直線性のある値
として検出することができるから、アルコール濃
度Ｃの高精度が検出が可能である。なお、アルコ
ール濃度Ｃに対する通電用電極１１，１２間の電
圧Vtは第８図に示すとおりである。 Thus, according to the embodiment, the pair of current-carrying electrodes 1
The potential difference V of the gasoline interposed between 1 and 12 is determined by the pair of detection electrodes 15 and 16, regardless of the polarization effect of the current-carrying electrodes 11 and 12, as shown in FIG. Since the alcohol concentration C can be detected as a linear value, the alcohol concentration C can be detected with high accuracy. Note that the voltage Vt between the current-carrying electrodes 11 and 12 with respect to the alcohol concentration C is as shown in FIG.
なお、実施例において電圧検出装置１７に増幅
器を接続し、電圧検出装置１７の検出電圧Ｅを該
増幅器で増幅して外部機器に出力するようにして
もよい。また、実施例ではアルコール混合液体と
してアルコール混合ガソリンを例示したが、本発
明はこれ以外のアルコール含有液体に適用しうる
ものである。 In the embodiment, an amplifier may be connected to the voltage detection device 17, and the detected voltage E of the voltage detection device 17 may be amplified by the amplifier and output to an external device. Furthermore, although alcohol-mixed gasoline was exemplified as the alcohol-mixed liquid in the examples, the present invention can be applied to other alcohol-containing liquids.
本発明は以上詳述した如くであつて、アルコー
ル混合液体中に離間して対向配設された一対の通
電用電極間の距離を分極効果によりアルコール濃
度に比例して電位差が大きくなる範囲に設定し、
該通電用電極間に位置して対向配設された一対の
検出用電極間の距離をアルコール濃度に比例して
検出電位差が大きくなる範囲に設定する構成とし
たから、該検出用電極によつてアルコール濃度に
比例した直線性のある電位差を効果的に検出する
ことができ、高精度にアルコール濃度を測定する
ことができる。
As described in detail above, the present invention sets the distance between a pair of current-carrying electrodes that are spaced apart and facing each other in an alcohol mixed liquid to a range where the potential difference increases in proportion to the alcohol concentration due to the polarization effect. death,
Since the distance between the pair of detection electrodes located opposite to each other between the energizing electrodes is set to a range in which the detection potential difference increases in proportion to the alcohol concentration, the detection electrodes A linear potential difference proportional to alcohol concentration can be effectively detected, and alcohol concentration can be measured with high accuracy.
第１図ないし第８図は本発明の実施例に係り、
第１図はアルコールセンサの回路図、第２図はア
ルコールセンサの構成説明図、第３図は理想状態
におけるアルコール濃度と出力電圧との関係を示
す線図、第４図は理想状態における通電用電極間
のアルコール濃度毎の電位差を示す説明図、第５
図は分極効果による実際の出力電圧の変化を示す
線図、第６図は通電用電極間のアルコール濃度毎
の電位差が分極効果により逆転した状態を示す説
明図、第７図は通電用電極と逆転した電位差に対
する検出用電極の配設状態を示す説明図、第８図
はアルコール濃度と逆転した電位差との関係を示
す特性線図、第９図ないし第１３図は従来技術に
係り、第９図はアルコール濃度に対する空燃比の
関係を示す線図、第１０図はアルコールセンサを
燃料パイプに配設した状態を示す配置図、第１１
図はアルコールセンサの回路図、第１２図はアル
コール濃度と検出抵抗との関係を示す線図、第１
３図はアルコール濃度と出力電圧との関係を示す
線図である。
１１，１２…通電用電極、１５，１６…検出用
電極、Ａ，Ｂ…逆転位置。
1 to 8 relate to embodiments of the present invention,
Figure 1 is a circuit diagram of the alcohol sensor, Figure 2 is an explanatory diagram of the configuration of the alcohol sensor, Figure 3 is a diagram showing the relationship between alcohol concentration and output voltage in an ideal state, and Figure 4 is for energization in an ideal state. Explanatory diagram showing the potential difference for each alcohol concentration between electrodes, 5th
The figure is a diagram showing the actual change in output voltage due to the polarization effect, Figure 6 is an explanatory diagram showing the state in which the potential difference for each alcohol concentration between the current-carrying electrodes is reversed due to the polarization effect, and Figure 7 is a diagram showing the difference between the current-carrying electrodes and the alcohol concentration. FIG. 8 is a characteristic diagram showing the relationship between alcohol concentration and reversed potential difference; FIGS. 9 to 13 relate to the prior art; Figure 10 is a diagram showing the relationship between the air-fuel ratio and alcohol concentration; Figure 10 is a layout diagram showing the alcohol sensor installed in the fuel pipe;
The figure is a circuit diagram of the alcohol sensor, Figure 12 is a diagram showing the relationship between alcohol concentration and detection resistance, and Figure 1 is a diagram showing the relationship between alcohol concentration and detection resistance.
FIG. 3 is a diagram showing the relationship between alcohol concentration and output voltage. 11, 12...electrode for energization, 15, 16...electrode for detection, A, B...reverse position.
Claims (1)
れ、一定の電圧が印加されるようになつた一対の
通電用電極と、該一対の通電用電極間に位置して
所定間隔離間して対向配設された一対の検出用電
極とからなり、前記一対の通電用電極間の距離は
アルコール濃度に比例して該通電用電極間の電位
差が大きくなる範囲に設定し、前記一対の検出用
電極は該通電用電極間においてアルコール濃度に
比例して検出電位差が大きくなる範囲に配設する
ように構成してなる電位差式アルコールセンサ。1. A pair of current-carrying electrodes that are arranged facing each other at a distance in an alcohol mixed liquid and to which a constant voltage is applied; The distance between the pair of current-carrying electrodes is set in a range where the potential difference between the current-carrying electrodes increases in proportion to the alcohol concentration, and the pair of detection electrodes A potentiometric alcohol sensor configured to be arranged in a range where a detected potential difference increases in proportion to alcohol concentration between the current-carrying electrodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12140788A JPH01291150A (en) | 1988-05-18 | 1988-05-18 | Potential difference type alcohol sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12140788A JPH01291150A (en) | 1988-05-18 | 1988-05-18 | Potential difference type alcohol sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01291150A JPH01291150A (en) | 1989-11-22 |
| JPH0547779B2 true JPH0547779B2 (en) | 1993-07-19 |
Family
ID=14810412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12140788A Granted JPH01291150A (en) | 1988-05-18 | 1988-05-18 | Potential difference type alcohol sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01291150A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09196877A (en) * | 1996-01-18 | 1997-07-31 | Toyota Central Res & Dev Lab Inc | Cleaning liquid contamination degree inspection device |
-
1988
- 1988-05-18 JP JP12140788A patent/JPH01291150A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09196877A (en) * | 1996-01-18 | 1997-07-31 | Toyota Central Res & Dev Lab Inc | Cleaning liquid contamination degree inspection device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01291150A (en) | 1989-11-22 |
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