JPH0680426B2 - Air-fuel ratio detector - Google Patents
Air-fuel ratio detectorInfo
- Publication number
- JPH0680426B2 JPH0680426B2 JP59220439A JP22043984A JPH0680426B2 JP H0680426 B2 JPH0680426 B2 JP H0680426B2 JP 59220439 A JP59220439 A JP 59220439A JP 22043984 A JP22043984 A JP 22043984A JP H0680426 B2 JPH0680426 B2 JP H0680426B2
- Authority
- JP
- Japan
- Prior art keywords
- solid electrolyte
- heater
- circuit
- air
- fuel ratio
- 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
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/4065—Circuit arrangements specially adapted therefor
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
Description
【発明の詳細な説明】 〔発明の利用分野〕 本発明は空燃比検出器に係り、特に燃焼器等に使用する
ために好適な空燃比検出器に関する。Description: FIELD OF THE INVENTION The present invention relates to an air-fuel ratio detector, and more particularly to an air-fuel ratio detector suitable for use in a combustor or the like.
従来、空燃比検出器の拡散抵抗体や電極の抵抗値の製造
上のばらつきは、特開昭59−34432号公報に示されてい
るように、外部回路例えばマイクロコンピユータ内に設
けた抵抗値を調整することにより調整していた。しか
し、このような補正方法を採用した場合、回路と検出器
一体で調整しなければならず、空燃比検出器の互換性が
無くなり、量産性、コスト、メンテナンスの点で極めて
不都合が生じるという欠点があつた。Conventionally, the manufacturing variations in the resistance values of the diffusion resistors and the electrodes of the air-fuel ratio detector are caused by the resistance values provided in an external circuit, for example, a microcomputer as shown in JP-A-59-34432. It was adjusted by adjusting. However, if such a correction method is adopted, it is necessary to adjust the circuit and the detector integrally, the compatibility of the air-fuel ratio detector is lost, and there is a disadvantage that mass production, cost, and maintenance are extremely inconvenient. I got it.
本発明の目的は、互換性が向上し、さらにメンテナンス
費、およびコストの低減を促進できる空燃比検出器を提
供することにある。An object of the present invention is to provide an air-fuel ratio detector which has improved compatibility and can promote maintenance cost and cost reduction.
〔発明の概要〕 本発明は、センサ部の拡散抵抗体及び電極のばらつきを
補正するための固体電解質用補償抵抗とヒータの抵抗値
のばらつきを補正するためのヒータ用補償抵抗とをセン
サ部と接続されているコネクタ部内に設けたことを特徴
としている。SUMMARY OF THE INVENTION According to the present invention, a compensation resistor for a solid electrolyte for correcting a dispersion of a diffusion resistor and an electrode of a sensor unit and a compensation resistor for a heater for correcting a dispersion of a resistance value of a heater are provided as a sensor unit. It is characterized in that it is provided in the connected connector part.
第１図は、本発明による空燃比検出器のセンサ本体１の
一実施例を示す断面図である。FIG. 1 is a sectional view showing an embodiment of a sensor body 1 of an air-fuel ratio detector according to the present invention.
第１図において、２は保護管、３はヒータ、４は固体電
解質、５はワツシヤ、６は栓体、７および８はワツシ
ヤ、９は充填剤、10はスペーサ、11はワツシヤ、12は金
網、13は金属ケース、14は金属パイプ、15はコイルバ
ネ、16は金属ケース、17および18,19は絶縁碍子、20は
皿ばね、21はグロメツト、22はヒータ用のリード線、23
は固体電解質用のリード線である。In FIG. 1, 2 is a protective tube, 3 is a heater, 4 is a solid electrolyte, 5 is a washer, 6 is a plug, 7 and 8 are washers, 9 is a filler, 10 is a spacer, 11 is a washer, 12 is a wire mesh. , 13 is a metal case, 14 is a metal pipe, 15 is a coil spring, 16 is a metal case, 17 and 18, 19 are insulators, 20 is a disc spring, 21 is a grommet, 22 is a lead wire for a heater, 23
Is a lead wire for a solid electrolyte.
このような構造のセンサ本体は、栓体６により燃焼器の
排気管に取り付けられる。固体電解質４は、ヒータ３に
より加熱され、活性化される。加熱された固体電解質４
は、保温性も考慮された保護管２により保護されてい
る。固体電解質４の外側は、排気にさらされており、ヒ
ータ５側には大気が導かれている。また、リード線とし
ては、ヒーター用のリード線22が２本、固体電解質用の
リード線23が２本取り出されている。The sensor body having such a structure is attached to the exhaust pipe of the combustor by the plug body 6. The solid electrolyte 4 is heated and activated by the heater 3. Heated solid electrolyte 4
Are protected by a protective tube 2 in which heat retention is also taken into consideration. The outside of the solid electrolyte 4 is exposed to exhaust gas, and the atmosphere is guided to the heater 5 side. As the lead wires, two lead wires 22 for the heater and two lead wires 23 for the solid electrolyte are taken out.
第２図は、空燃比センサの検出原理を示す図である。固
体電解質４の大気側と排気側にＡ電極25とＥ電極24が設
けてあり、排気側にはさらに拡散抵抗体26が設けられて
いる。Ａ電極25を正極、Ｅ電極24を負極として電圧を印
加すると、排気中の酸素が固体電解質４内を通つて排気
側から大気側に流れる。この酸素の流れを拡散抵抗体26
により律すると、排気中の酸素濃度に比例した限界電流
が得られる。この電流値を電圧値に変換した場合の空燃
比検出器の出力特性を第３図に実線で示しているが、空
気過剰率λが排気中の酸素濃度に比例するため、空気過
剰率λに比例した出力電圧が得られる。FIG. 2 is a diagram showing the detection principle of the air-fuel ratio sensor. An A electrode 25 and an E electrode 24 are provided on the atmosphere side and the exhaust side of the solid electrolyte 4, and a diffusion resistor 26 is further provided on the exhaust side. When a voltage is applied with the A electrode 25 as the positive electrode and the E electrode 24 as the negative electrode, oxygen in the exhaust gas passes through the solid electrolyte 4 and flows from the exhaust gas side to the atmosphere side. Diffusion resistor 26
If it is controlled by, the limiting current proportional to the oxygen concentration in the exhaust gas can be obtained. The output characteristic of the air-fuel ratio detector when this current value is converted into a voltage value is shown by the solid line in FIG. 3, but since the excess air ratio λ is proportional to the oxygen concentration in the exhaust gas, A proportional output voltage is obtained.
ここで、拡散抵抗体26やＥ電極24の厚さが厚いか、また
は気孔率が小さい場合は、出力電力は第３図(イ)の破線
に示すように低くなつてしまう。また、拡散抵抗体４や
Ｅ電極24の厚さが薄いか、または気孔率が大きい場合に
は、第３図(ロ)の破線で示すように出力電圧が高くなつ
てしまう。このような製造上のばらつきは、厳密には避
けることができない。従つて、このばらつきを補正しな
ければならない。Here, when the diffusion resistor 26 and the E electrode 24 are thick or the porosity is small, the output power becomes low as shown by the broken line in FIG. If the diffusion resistor 4 and the E electrode 24 are thin or have a high porosity, the output voltage becomes high as shown by the broken line in FIG. Such manufacturing variations cannot be strictly avoided. Therefore, this variation must be corrected.
一方、固体電解質４とヒータ３で加熱し活性化するが、
この際に固体電解質４の温度が設定値より高いと、第３
図(ロ)の破線のように出力電圧が高くなり、逆に温度が
低いと第３図(イ)の破線のように出力電圧が低くなる。
従つて、ヒータ３の抵抗値が製造段階でばらついたので
は、正確な温度制御はできない。このため、ヒータ３の
抵抗値のばらつきも補正しなければならない。On the other hand, the solid electrolyte 4 and the heater 3 heat and activate the
At this time, if the temperature of the solid electrolyte 4 is higher than the set value, the third
The output voltage becomes high as indicated by the broken line in FIG. 2B, and conversely when the temperature is low, the output voltage becomes low as indicated by the broken line in FIG.
Therefore, if the resistance value of the heater 3 varies at the manufacturing stage, accurate temperature control cannot be performed. Therefore, it is also necessary to correct the variation in the resistance value of the heater 3.
第４図はこの補正のための回路の一実施例を示すもので
あり、固体電解質４、ヒータ３、ヒータ用補償抵抗27、
固体電解質用補償抵抗28、ヒータ用回路29、固体電解質
用回路30、回路基板部31の構成を示している。同図にお
いてヒータ３には、回路基板Ｍ部（マイクロコンピュー
タも含む）内の回路29から定電圧または定電流が供給さ
れる。ヒータ用補償抵抗体27は、センサ部（Ｓ部）と、
前記Ｍ部を結線する場合の途中のコネクタ部（Ｃ部）の
Ｓ部側に設けられている。このため、Ｃ部の切り放し部
は、図４中の矢印部より左側となる。このヒータ用補償
抵抗体27の抵抗値を調整することにより、ヒータ３の抵
抗値とヒータ用補償抵抗体27の抵抗値との和が全ての製
品で一定となるようにする。このようにすることによ
り、ヒータ３の抵抗値のばらつきをＳ部側で補償でき
る。なお、補償抵抗体27の抵抗値の調整の仕方は、例え
ばレーザートリミングやポテンシヨンメーターなどを用
いる方法が考えられる。FIG. 4 shows an embodiment of a circuit for this correction. The solid electrolyte 4, the heater 3, the heater compensating resistor 27,
The configurations of a solid electrolyte compensation resistor 28, a heater circuit 29, a solid electrolyte circuit 30, and a circuit board portion 31 are shown. In the figure, a constant voltage or a constant current is supplied to the heater 3 from a circuit 29 in the circuit board M section (including a microcomputer). The heater compensation resistor 27 includes a sensor section (S section),
It is provided on the S section side of the connector section (C section) in the middle of connecting the M section. Therefore, the cut-off portion of the C portion is on the left side of the arrow portion in FIG. By adjusting the resistance value of the heater compensation resistor 27, the sum of the resistance value of the heater 3 and the resistance value of the heater compensation resistor 27 is made constant in all products. By doing so, variations in the resistance value of the heater 3 can be compensated for on the S section side. As a method of adjusting the resistance value of the compensation resistor 27, for example, a method using laser trimming or a potentiometer can be considered.
一方、固体電解質４には、回路30内の端子33,34より一
定の電圧が供給されており、このとき固体電解質４に流
れる電流値が、固体電解質用補償抵抗体28の両端の電圧
値として端子32,33で検出される。この検出電圧値が第
３図で示した検出器の出力電圧となる。この場合、補償
用抵抗体28の抵抗値を変化させることにより、その出力
電圧は第３図(イ)，(ロ)のように自由に変化する。すなわ
ち、出力電圧のゲインの調整が可能になる。そこで、固
体電解質４の排気にさらされる部分を既知の酸素濃度ふ
ん囲気中に置き、第５図で示すようにある設定電圧VSを
端子35,36に印加し、そのときの端子36,37間の電圧VTが
全ての製品で一定になるように補償用抵抗体28の抵抗値
を調整する。これにより、固体電解質４の製造上のばら
つきを補償できる。なお、既知の酸素濃度とは、例えば
大気中の酸素濃度でもよい。また、補償用抵抗体28の抵
抗値の調整の方法は、抵抗体28の場合と同様に、例えば
レーザートリミングやポテンシヨンメータでもよい。On the other hand, the solid electrolyte 4 is supplied with a constant voltage from the terminals 33 and 34 in the circuit 30, and the current value flowing through the solid electrolyte 4 at this time is the voltage value across the compensating resistor 28 for the solid electrolyte. Detected at terminals 32 and 33. This detected voltage value becomes the output voltage of the detector shown in FIG. In this case, by changing the resistance value of the compensating resistor 28, its output voltage freely changes as shown in FIGS. 3 (a) and 3 (b). That is, the gain of the output voltage can be adjusted. Therefore, the portion of the solid electrolyte 4 exposed to the exhaust gas is placed in a known oxygen concentration atmosphere, and a certain set voltage V S is applied to the terminals 35 and 36 as shown in FIG. 5, and the terminals 36 and 37 at that time are applied. The resistance value of the compensating resistor 28 is adjusted so that the voltage V T between them becomes constant in all products. This makes it possible to compensate for manufacturing variations in the solid electrolyte 4. The known oxygen concentration may be, for example, the oxygen concentration in the atmosphere. The method of adjusting the resistance value of the compensating resistor 28 may be, for example, laser trimming or a potentiometer, as in the case of the resistor 28.
第６図は、第４図の回路を製品化した場合の実際の概観
図であり、センサ部（Ｓ部）より、４本のリード線22,2
3が取り出されており、コネクタ部（Ｃ部）に接続され
ている。コネクタ部（Ｃ部）は、センサ部（Ｓ部）側の
コネクタ38と回路部（Ｍ部）側のコネクタ39とから構成
されており、ヒータ用補償抵抗体27と固体電解質用補償
抵抗体28は、センサ側のコネクタ38内に設置されてい
る。FIG. 6 is an actual overview of the circuit shown in FIG. 4 when it is commercialized, and the four lead wires 22, 2 from the sensor section (S section)
3 is taken out and connected to the connector part (C part). The connector section (C section) is composed of a sensor section (S section) side connector 38 and a circuit section (M section) side connector 39, and comprises a heater compensation resistor 27 and a solid electrolyte compensation resistor 28. Are installed in the connector 38 on the sensor side.
第７図は、ヒータ用回路29の詳細図である。同図におい
て、40はマイクロコンピユータ、41はトランジスタ、42
はコイル、43はスイツチである。マイクロコンピユータ
40から出力される信号によりトランジスタ41が通電状態
になると、コイル42に電圧VDが作用し、スイツチ43がON
状態となり、ヒータ３に電圧VDが印加される。逆に、マ
イクロコンピユータ40からOFF信号が出力された場合に
は、トランジスタ41がOFF状態となり、スイツチ43もOFF
となり、ヒータ３には電圧VDは印加されなくなる。FIG. 7 is a detailed view of the heater circuit 29. In the figure, 40 is a microcomputer, 41 is a transistor, and 42
Is a coil and 43 is a switch. Micro Computer
When the transistor 41 is energized by the signal output from 40, the voltage V D acts on the coil 42 and the switch 43 turns on.
Then, the voltage V D is applied to the heater 3. On the contrary, when the OFF signal is output from the microcomputer 40, the transistor 41 is turned off and the switch 43 is also turned off.
Therefore, the voltage V D is not applied to the heater 3.
第８図は、固体電解質用回路30の詳細図である。同図に
おいて、44はオペアンプ、45はオペアンプ、46はトラン
ジスタ、47,48は抵抗である。この回路30では、オペア
ンプ44とトランジスタ46とにより、固体電解質４に印加
される電圧が抵抗47,48で分圧された一定電圧値になる
ように制御されている。また、補償用抵抗体28に流れる
電流値を検出してオペアンプ45で増幅し、検出出力Vout
として送出している。この回路30では、補償用抵抗体28
でゲイン調整をしているために回路側での調整が不要と
なる。FIG. 8 is a detailed view of the solid electrolyte circuit 30. In the figure, 44 is an operational amplifier, 45 is an operational amplifier, 46 is a transistor, and 47 and 48 are resistors. In this circuit 30, the voltage applied to the solid electrolyte 4 is controlled by the operational amplifier 44 and the transistor 46 to be a constant voltage value divided by the resistors 47 and 48. Further, the value of the current flowing through the compensating resistor 28 is detected and amplified by the operational amplifier 45, and the detection output V out
Is sent as. In this circuit 30, the compensation resistor 28
Since the gain is adjusted in, the adjustment on the circuit side becomes unnecessary.
第９図は、ヒータ用コネクタ部と回路との接続関係の応
用例を示す図であり、ヒータ３に流れる電流を補償用抵
抗体27の両端の電圧値として検出し、ヒータ３に流れる
電流値が常に一定になるように、オペアンプ49、トラン
ジスタ50により制御するものである。この構成によれ
ば、コネクタ部（Ｃ部）の回路側端子は３端子となる。FIG. 9 is a diagram showing an application example of the connection relationship between the heater connector section and the circuit, in which the current flowing through the heater 3 is detected as the voltage value across the compensating resistor 27, and the current value flowing through the heater 3 is detected. Is controlled by the operational amplifier 49 and the transistor 50 so that is always constant. According to this configuration, the circuit side terminals of the connector section (C section) are three terminals.
第10図は、一定電流を固体電解質４に励起し、０〜1V間
で変化する電圧値を0.5Vになるように制御して、空燃比
を制御するタイプのセンサの較正法を示した図である。
同図において、コネクタ部（Ｃ部）には、固体電解質４
と並列に可変抵抗52が設けられており、固体電解質４を
既知の酸素濃度ふん囲気中に置いた状態で固体電解質４
に一定電流ISを流し、第11図に示すように、０〜1V間で
変化し、0.5V付近で落着くように抵抗52を調整する（固
体電解質４に流れる電流を調整するのと同じ）。これに
より、センサのばらつきを補正できる。なお、第10図に
おける53は定電流発生回路、54は電圧検出器である。FIG. 10 is a diagram showing a method for calibrating a sensor of a type in which a constant current is excited in the solid electrolyte 4 and a voltage value varying between 0 and 1 V is controlled to 0.5 V to control the air-fuel ratio. Is.
In the figure, the solid electrolyte 4 is attached to the connector portion (C portion).
A variable resistor 52 is provided in parallel with the solid electrolyte 4 in a state where the solid electrolyte 4 is placed in a known oxygen concentration atmosphere.
A constant current I S, as shown in FIG. 11, vary between 0 to 1 V, adjusting the resistance 52 so that rather settle around 0.5V (equivalent to adjusting the current flowing in the solid electrolyte 4 ). This makes it possible to correct the sensor variation. In FIG. 10, 53 is a constant current generating circuit and 54 is a voltage detector.
第12図は、第10図における回路54の一例を示す図であ
り、センサの起電力変化（０〜1V）をオペアンプ55によ
つて検出し、設定空燃比を境いとしてON,OFFする出力信
号が送出される。FIG. 12 is a diagram showing an example of the circuit 54 in FIG. 10, in which an electromotive force change (0 to 1 V) of the sensor is detected by the operational amplifier 55, and the output is turned on and off with the set air-fuel ratio as a boundary. The signal is sent out.
第13図は、空燃比の検出法の応用例を示したもので、空
気過剰率λが1.0よりも小さい領域でも測定できる方法
である。すなわち、λ＜1.0では、第13図（ａ）に示す
ように、電圧VB1を印加することにより拡散抵抗体26内
に酸素を送り込む。次に、この送り込んだ酸素と排気中
の一酸化炭素とが拡散抵抗体26内で反応して残つた酸素
量を、電圧VS（VB1とは逆極性）を印加することにより
検出する。そこで、この検出された電流値を積分する
と、第14図の実線（ａ）のような特性となる。すなわ
ち、この場合は第13図（ｂ）に示すように固体電解質４
に極性の異なつたVSとVB1の電圧を時分割的に印加する
必要がある。FIG. 13 shows an application example of the air-fuel ratio detection method, which is a method that can be measured even in a region where the excess air ratio λ is smaller than 1.0. That is, when λ <1.0, oxygen is sent into the diffusion resistor 26 by applying the voltage V B1 as shown in FIG. Next, the amount of oxygen left by the reaction between the fed oxygen and carbon monoxide in the exhaust gas in the diffusion resistor 26 is detected by applying a voltage V S (having a polarity opposite to V B1 ). Therefore, when the detected current value is integrated, the characteristics shown by the solid line (a) in FIG. 14 are obtained. That is, in this case, as shown in FIG.
It is necessary to apply the voltages of V S and V B1 , which have different polarities, in a time division manner.
λ＞1.0では、排気中に酸素が存在するので、拡散抵抗
体26内に酸素を送り込む必要がなく、大気側に移動させ
るだけでよい。このときのVSが印加されている状態での
電流値を電圧値に変換すると、第14図の実線（ｂ）のよ
うな特性となる。When λ> 1.0, since oxygen exists in the exhaust gas, it is not necessary to send oxygen into the diffusion resistor 26, and it is sufficient to move it to the atmosphere side. When the current value with V S applied at this time is converted into a voltage value, the characteristics shown by the solid line (b) in FIG. 14 are obtained.
第15図は、第13図で説明した検出方法を実現するための
回路の一実施例を示すもので、56〜58はトランジスタ、
59〜61はコイル、62〜64はスイツチ、65はオペアンプで
ある。FIG. 15 shows an embodiment of a circuit for realizing the detection method described in FIG. 13, 56 to 58 are transistors,
Reference numerals 59 to 61 are coils, 62 to 64 are switches, and 65 is an operational amplifier.
マイクロコンピユータ40の出力信号により、トランジス
タ−56〜58はそれぞれ適時ON、OFF状態にし、コイル59
〜61にそれぞれ適時電圧VDを印加する。これにより、ス
イツチ62〜64がON、OFFして、第13図（ｂ），（ｄ）の
電圧信号を時分割的に作り出し、固体電解質４に印加す
る。また、補償用抵抗体28の両端の電圧を検出し、オペ
アンプ65で増幅し、検出出力Voutとして送出する。Depending on the output signal of the microcomputer 40, the transistors 56 to 58 are turned on and off respectively at appropriate times, and the coil 59
The voltage V D is applied to each of ~ 61 at appropriate times. As a result, the switches 62 to 64 are turned on and off to generate the voltage signals of FIGS. 13 (b) and 13 (d) in a time division manner and apply them to the solid electrolyte 4. Further, the voltage across the compensating resistor 28 is detected, amplified by the operational amplifier 65, and sent as the detection output V out .
本発明によれば、固体電解質の拡散抵抗や電極、さらに
はヒータの抵抗値の製造上のばらつきを回路で補償する
必要はなくなり、回路に対する互換性が向上する。ま
た、センサ部の組み立て後に固体電解質とヒータの双方
の調整をすることができるため固体電解質の正確な温度
制御が可能となる。According to the present invention, it is not necessary to compensate for variations in the diffusion resistance of the solid electrolyte, electrodes, and manufacturing variations in the resistance value of the heater in the circuit, and compatibility with the circuit is improved. In addition, since both the solid electrolyte and the heater can be adjusted after the sensor unit is assembled, the temperature of the solid electrolyte can be accurately controlled.
第１図は本発明に用いるセンサ本体の断面図、第２図は
固体電解質の断面図、第３図はセンサ特性図、第４図は
外部回路、コネクタ、センサ部の結線図、第５図はばら
つき較正時の特性図、第６図は回路、コネクタ、センサ
部の実際の概観図、第７図はヒータ用回路の詳細図、第
８図は固体電解質用回路の詳細図、第９図はヒータ用回
路の応用例を示す図、第10図は固体電解質用回路の応用
例を示す図、第11図は特性較正時の特性図、第12図は第
10図の回路54詳細図、第13図は空燃比測定法の他の例を
示す原理図、第14図は第13図の方法を用いて得られる特
性図、第15図は第13図の測定方法を実現するための回路
図である。 ３…ヒーター、４…固体電解質、26…拡散抵抗体、27,2
8…補償用抵抗体、29…ヒーター用回路、30…固体電解
質用回路、38,39…コネクタ部、40…マイクロコンピユ
ータ。FIG. 1 is a sectional view of a sensor body used in the present invention, FIG. 2 is a sectional view of a solid electrolyte, FIG. 3 is a sensor characteristic diagram, FIG. 4 is a connection diagram of an external circuit, a connector and a sensor portion, and FIG. Is a characteristic diagram during dispersion calibration, FIG. 6 is an actual overview of the circuit, connector, and sensor unit, FIG. 7 is a detailed view of the heater circuit, FIG. 8 is a detailed view of the solid electrolyte circuit, and FIG. Is a diagram showing an application example of a circuit for a heater, FIG. 10 is a diagram showing an application example of a circuit for a solid electrolyte, FIG. 11 is a characteristic diagram during characteristic calibration, and FIG.
Detailed circuit 54 of FIG. 10, FIG. 13 is a principle diagram showing another example of the air-fuel ratio measuring method, FIG. 14 is a characteristic diagram obtained by using the method of FIG. 13, FIG. 15 is of FIG. It is a circuit diagram for realizing a measuring method. 3 ... Heater, 4 ... Solid electrolyte, 26 ... Diffusion resistor, 27,2
8 ... Compensating resistor, 29 ... Heater circuit, 30 ... Solid electrolyte circuit, 38, 39 ... Connector part, 40 ... Microcomputer.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭58−205849（ＪＰ，Ａ) 特開 昭59−34432（ＪＰ，Ａ) 特開 昭56−86349（ＪＰ，Ａ) 特開 昭60−192251（ＪＰ，Ａ) 実開 昭60−120354（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-58-205849 (JP, A) JP-A-59-34432 (JP, A) JP-A-56-86349 (JP, A) JP-A-60- 192251 (JP, A) Actually opened Sho 60-120354 (JP, U)
Claims (1)
る固体電解質、その固体電解質の排気ガス側に設けられ
た拡散抵抗体及び前記固体電解質を加熱するためのヒー
タとを有するセンサ部と、前記センサ部と前記センサ部
を駆動するための回路部とを接続するためのコネクタ部
とを備えた空燃比検出器において、前記拡散抵抗体及び
前記電極の抵抗値のばらつきを補正するための固体電解
質用補償抵抗と前記ヒータの抵抗値のばらつきを補正す
るためのヒータ用補償抵抗とを前記センサ部と接続され
ている前記コネクタ部内に設けたことを特徴とする空燃
比検出器。1. A sensor unit having a solid electrolyte having electrodes on the atmosphere side and the exhaust gas side, a diffusion resistor provided on the exhaust gas side of the solid electrolyte, and a heater for heating the solid electrolyte, In an air-fuel ratio detector including a connector section for connecting the sensor section and a circuit section for driving the sensor section, a solid body for correcting variations in resistance values of the diffusion resistor and the electrode. An air-fuel ratio detector, wherein an electrolyte compensation resistor and a heater compensation resistor for correcting variations in the resistance value of the heater are provided in the connector portion connected to the sensor portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59220439A JPH0680426B2 (en) | 1984-10-22 | 1984-10-22 | Air-fuel ratio detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59220439A JPH0680426B2 (en) | 1984-10-22 | 1984-10-22 | Air-fuel ratio detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6199852A JPS6199852A (en) | 1986-05-17 |
| JPH0680426B2 true JPH0680426B2 (en) | 1994-10-12 |
Family
ID=16751124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59220439A Expired - Lifetime JPH0680426B2 (en) | 1984-10-22 | 1984-10-22 | Air-fuel ratio detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0680426B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2505459B2 (en) * | 1987-01-27 | 1996-06-12 | 日本碍子株式会社 | Adjustment method of oxygen concentration measuring device |
| JP2633641B2 (en) * | 1988-08-26 | 1997-07-23 | 本田技研工業株式会社 | Exhaust gas concentration detector |
| US5182519A (en) * | 1990-10-22 | 1993-01-26 | Mitsubishi Denki Kabushiki Kaisha | Heater control device for an air-fuel ratio sensor |
| EP0937979A3 (en) * | 1998-02-20 | 2000-11-22 | NGK Spark Plug Co. Ltd. | NOx sensor control circuit unit and NOx sensor system using the same |
| IT1306315B1 (en) * | 1998-07-16 | 2001-06-04 | Magneti Marelli Spa | CONTROL DEVICE OF A LINEAR OXYGEN PROBE |
| IT1306286B1 (en) * | 1998-11-13 | 2001-06-04 | Magneti Marelli Spa | CONTROL DEVICE OF A LINEAR OXYGEN PROBE. |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5686349A (en) * | 1979-12-18 | 1981-07-14 | Nissan Motor Co Ltd | Production of substrate for gas sensor with heater |
| JPS58205849A (en) * | 1982-05-26 | 1983-11-30 | Toyota Motor Corp | Oxygen concentration detector |
| JPS5934432A (en) * | 1982-08-23 | 1984-02-24 | Toyota Motor Corp | Air-fuel ratio controller of internal-combustion engine |
-
1984
- 1984-10-22 JP JP59220439A patent/JPH0680426B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6199852A (en) | 1986-05-17 |
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