JPH06148130A - Measuring method for water concentration and oxygen concentration in exhaust gas - Google Patents
Measuring method for water concentration and oxygen concentration in exhaust gasInfo
- Publication number
- JPH06148130A JPH06148130A JP4298937A JP29893792A JPH06148130A JP H06148130 A JPH06148130 A JP H06148130A JP 4298937 A JP4298937 A JP 4298937A JP 29893792 A JP29893792 A JP 29893792A JP H06148130 A JPH06148130 A JP H06148130A
- Authority
- JP
- Japan
- Prior art keywords
- oxygen
- concentration
- signal
- exhaust gas
- oxygen pump
- 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
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 95
- 239000001301 oxygen Substances 0.000 title claims abstract description 95
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 95
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 239000007789 gas Substances 0.000 title claims description 30
- 238000000034 method Methods 0.000 title claims description 19
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 32
- 150000002500 ions Chemical class 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 4
- 229910052573 porcelain Inorganic materials 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 abstract description 4
- 238000000926 separation method Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000005868 electrolysis reaction Methods 0.000 description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical group O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
Description
【発明の詳細な説明】Detailed Description of the Invention
【０００１】[0001]
【産業上の利用分野】本発明は、ゴミ焼却炉、汚泥焼却
炉、ならびに石炭ボイラ等の排ガス中の水分濃度および
酸素濃度を測定する方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste incinerator, a sludge incinerator, and a method for measuring the water content and oxygen content in exhaust gas from a coal boiler or the like.
【０００２】[0002]
【従来の技術】従来、排ガス中の水分濃度および酸素濃
度を測定する方法として、通常の固体電解質を利用した
酸素濃淡電池により酸素濃度を測定するとともに、(a)
ジルコニア酸素ポンプの電圧Vpを、排ガス中の水蒸気を
電気分解しないような第１の設定電圧と、排ガス中の水
蒸気を電気分解するような第２の設定電圧とを交互に切
り替えて、それぞれの酸素ポンプ電流の差により水分濃
度を測定する方法、(b)ジルコニア酸素ポンプを２個準
備して、一方は上記第１の設定電圧とし、他は第２の設
定電圧として、それぞれのポンプ電流の差により水分濃
度を測定する方法（例えば、特開昭６３−８５３５１号
公報）、(c) ジルコニア２セル方式を用いて、酸素濃淡
電池の制御電圧を第１の設定電圧と第２の設定電圧とし
て、それぞれの酸素ポンプ電流を測定し、その差から水
分濃度を測定する方法等が知られている。2. Description of the Related Art Conventionally, as a method for measuring the water concentration and oxygen concentration in exhaust gas, the oxygen concentration is measured by an oxygen concentration battery using a normal solid electrolyte, and (a)
The voltage Vp of the zirconia oxygen pump is switched alternately between a first set voltage that does not electrolyze the water vapor in the exhaust gas and a second set voltage that electrolyzes the water vapor in the exhaust gas to obtain the respective oxygen. Method for measuring water concentration by difference in pump current, (b) Two zirconia oxygen pumps are prepared, one of which is the first set voltage and the other of which is the second set voltage. Method (for example, Japanese Patent Laid-Open No. 63-85351), (c) Zirconia 2-cell method is used, and the control voltage of the oxygen concentration battery is set to the first set voltage and the second set voltage. A method is known in which the oxygen pump currents are measured and the water concentration is measured from the difference.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上述し
た(a) に示す方法では、酸素ポンプに印加する第１の設
定電圧と第２の設定電圧を交互に取り替え、かつ同期を
とって酸素ポンプ電流Ipを測定しなければならないた
め、そのための回路構成が複雑になる問題があった。ま
た、ジルコニア酸素ポンプを長時間使用していると、H2
O の電気分解時におけるＨ+ イオンがチャージして、酸
素ポンプに発生する酸素濃淡電池の逆起電力が増加し
て、ジルコニア酸素ポンプ電流が時間と共に低下して、
指示誤差を発生する問題もあった。さらに、上述した
(b) 、(c) に示す方法では、酸素ポンプを２個必要とし
構成が複雑となるとともに、上述した(a) の方法と同様
に、H2O の電気分解によるＨ+ イオンのチャージによる
指示誤差が発生する問題があった。However, in the method shown in (a) above, the first set voltage and the second set voltage applied to the oxygen pump are alternately replaced and the oxygen pump current is synchronized. Since Ip must be measured, there is a problem that the circuit configuration for that becomes complicated. Also, if the zirconia oxygen pump is used for a long time, H 2
H + ions are charged during the electrolysis of O 2, the counter electromotive force of the oxygen concentration battery generated in the oxygen pump increases, and the zirconia oxygen pump current decreases with time,
There was also a problem that an instruction error occurred. Furthermore, as mentioned above
In the methods shown in (b) and (c), two oxygen pumps are required, which complicates the configuration, and as in the method (a) described above, due to the charge of H + ions by the electrolysis of H 2 O. There was a problem that an instruction error occurred.
【０００４】本発明の目的は上述した課題を解決して、
簡単な構成で精度良く長時間にわたって排ガス中の水分
濃度と酸素濃度を測定できる方法を提供しようとするも
のである。The object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide a method capable of accurately measuring the water concentration and oxygen concentration in exhaust gas for a long time with a simple configuration.
【０００５】[0005]
【課題を解決するための手段】本発明の排ガス中の水分
濃度および酸素濃度の測定方法は、酸素ポンプに以下の
式で示される電圧Vpを印加し、Means for Solving the Problems The method for measuring the water content and oxygen content in exhaust gas of the present invention is to apply a voltage Vp represented by the following formula to an oxygen pump,
【数５】 Vp＝V1＋((V2−V1)/2)＊(1＋Ｆ(t))＋Ip＊(Rp ＋rl＋Ro) ここで、 V1 ：排ガス中の水蒸気を電気分解しないような第
１の設定電圧、 V2 ：排ガス中の水蒸気を電気分解するような第２
の設定電圧、 F(t) ：重畳する交流電圧、ただし−１≦Ｆ(t) ≦
１、 Ip ：酸素ポンプ電流 Rp ：酸素ポンプの内部抵抗 rl ：リード線の抵抗 Ro ：Ipの検出抵抗 酸素ポンプ電流Ipの交流分を取り出し、整流し、ローパ
スフィルタで平滑化した平均値信号を水分信号として得
るとともに、酸素ポンプ電流IpからIpの交流分を引き算
した信号を酸素濃度信号として得、得られた水分信号お
よび酸素濃度信号から排ガス中の水分濃度および酸素濃
度を測定することを特徴とするものである。[Equation 5] Vp = V1 + ((V2-V1) / 2) * (1 + F (t)) + Ip * (Rp + rl + Ro) where V1 is the first set voltage that does not electrolyze the water vapor in the exhaust gas, V2: Second type that electrolyzes water vapor in exhaust gas
Set voltage, F (t): AC voltage to be superimposed, -1≤F (t) ≤
1, Ip: Oxygen pump current Rp: Oxygen pump internal resistance rl: Lead wire resistance Ro: Ip detection resistance The AC component of the oxygen pump current Ip is extracted, rectified, and smoothed by a low-pass filter A signal obtained by subtracting the alternating current component of Ip from the oxygen pump current Ip is obtained as an oxygen concentration signal, and the moisture concentration and oxygen concentration in the exhaust gas are measured from the obtained moisture signal and oxygen concentration signal. To do.
【０００６】[0006]
【作用】上述した構成において、排ガス中の水蒸気を電
気分解しないような第１の設定電圧V1に、所定の交流信
号を重畳させ、上記第１の設定電圧V1と排ガス中の水蒸
気を電気分解するような第２の設定電圧V2との間をVpが
繰り返し変化するようにしたため、従来方法における酸
素ポンプ電流の差をポンプ電流の交流分を整流しローパ
スフィルタで平滑した平均値として求めることができ、
その結果簡単な回路かつ１つの酸素ポンプで排ガス中の
水分濃度を測定することができる。In the above structure, a predetermined AC signal is superimposed on the first set voltage V1 which does not electrolyze the steam in the exhaust gas, and the first set voltage V1 and the steam in the exhaust gas are electrolyzed. Since Vp is repeatedly changed between the second set voltage V2 and the second set voltage V2 as described above, the difference between the oxygen pump currents in the conventional method can be obtained as an average value obtained by rectifying the AC component of the pump current and smoothing it with a low-pass filter. ,
As a result, the water concentration in the exhaust gas can be measured with a simple circuit and one oxygen pump.
【０００７】また、酸素濃度分は、所定の交流信号を重
畳させたポンプ電流を酸素濃度分＋水分濃度分として取
り出し、上述したようにして求めた水分濃度分を引き算
することにより酸素濃度分を得ることができる。このよ
うにして、本発明では、１個の酸素ポンプを構成するこ
とにより、排ガス中の水分濃度と酸素濃度とを簡単な回
路で測定することができる。As for the oxygen concentration, the oxygen concentration is obtained by taking out a pump current on which a predetermined AC signal is superimposed as an oxygen concentration + a moisture concentration and subtracting the moisture concentration obtained as described above. Obtainable. Thus, in the present invention, by configuring one oxygen pump, the water concentration and oxygen concentration in the exhaust gas can be measured with a simple circuit.
【０００８】[0008]
【実施例】図１は本発明の排ガス中の水分濃度および酸
素濃度の測定方法を実施する装置の一例の構成を示すブ
ロック図である。図１において、信号発生回路２〜４に
おいてそれぞれ発生した信号 V1 ＋Ａ、Ａsin ωｔ、Ip
＊（Rp＋rl＋Ro）は加算器１において加算され印加電圧
Vpを得る。ここで、V1は限界電流に対応した基準酸素ポ
ンプ電圧、Ａは（V2−V1）／２、Ipは酸素ポンプに流れ
る電流、Rpは酸素ポンプの内部抵抗、rlはリード線の抵
抗、RoはIpの検出抵抗、Ａsin ωｔは重畳する交流電圧
であり、上述したようにV1は排ガス中の水蒸気を電気分
解しないような第１の設定電圧、V2はジルコニア磁器の
黒化を引き起こす電圧を越えない排ガス中の水蒸気を電
気分解するような第２の設定電圧で、さらにFIG. 1 is a block diagram showing the construction of an example of an apparatus for carrying out the method for measuring the water concentration and oxygen concentration in exhaust gas according to the present invention. In FIG. 1, the signals V1 + A, Asin ωt, and Ip generated in the signal generating circuits 2 to 4 respectively.
* (Rp + rl + Ro) is added in adder 1 and applied voltage
Get Vp. Here, V1 is the reference oxygen pump voltage corresponding to the limiting current, A is (V2-V1) / 2, Ip is the current flowing in the oxygen pump, Rp is the internal resistance of the oxygen pump, rl is the resistance of the lead wire, and Ro is The detection resistance of Ip, Asin ωt, is the superimposed AC voltage. As mentioned above, V1 is the first set voltage that does not electrolyze the water vapor in the exhaust gas, and V2 does not exceed the voltage that causes blackening of the zirconia porcelain. With a second set voltage that electrolyzes water vapor in exhaust gas,
【数６】 Vp＝V1＋((V2−V1)/2)＊(1＋Ｆ(t))＋Ip＊(Rp ＋rl＋Ro) の関係にある。[Equation 6] Vp = V1 + ((V2-V1) / 2) * (1 + F (t)) + Ip * (Rp + rl + Ro).
【０００９】加算器１で加算された信号Vpは、抵抗５を
介して酸素ポンプ６に供給される。酸素ポンプ６の構造
は従来から公知の構造のものを使用することができ、例
えばジルコニア基板の表裏に電極を形成したものを使用
できる。酸素ポンプ電流Ipは一旦抵抗５の両端に発生す
る電圧として差動増幅器７に供給され、Ipの電圧信号と
して取り出される。取り出されたIpの電圧信号は信号入
力部９から供給されるVpと割算処理部８において(Rp ＋
rl＋Ro) はVp／Ipとして計算され、信号発生回路４へ供
給する。信号発生回路４へは酸素ポンプ電流Ipも供給さ
れ、所定の信号を発生している。The signal Vp added by the adder 1 is supplied to the oxygen pump 6 via the resistor 5. The oxygen pump 6 may have a conventionally known structure, for example, a zirconia substrate with electrodes formed on the front and back. The oxygen pump current Ip is once supplied to the differential amplifier 7 as a voltage generated across the resistor 5, and is taken out as a voltage signal of Ip. The extracted voltage signal of Ip is Vp supplied from the signal input unit 9 and (Rp +
rl + Ro) is calculated as Vp / Ip and supplied to the signal generation circuit 4. The oxygen pump current Ip is also supplied to the signal generating circuit 4 to generate a predetermined signal.
【００１０】酸素ポンプ電流Ipは、キャパシタ11および
抵抗12からなるAC分離回路により、重畳した交流分を取
り出される。そして、取り出された酸素ポンプ電流Ipの
交流分は、整流器13において整流され、ローパスフィル
タ14において平滑した平均値信号とされる。最後に、平
均値信号はH2O 出力変換器15において所望の出力形式の
データに変換され、水分濃度として出力される。これと
同時に、酸素ポンプ電流Ipは、前記AC分離回路により取
り出された交流分を減算器17において先の水分濃度分を
引いた後、ローパスフィルタ16で平滑化され酸素濃度分
として取り出され、O2出力変換器18において所望の出力
形式のデータに変換され、酸素濃度として出力される。The oxygen pump current Ip is taken out of the superimposed alternating current component by an AC separation circuit composed of a capacitor 11 and a resistor 12. Then, the extracted AC component of the oxygen pump current Ip is rectified by the rectifier 13 and made into a smoothed average value signal by the low-pass filter 14. Finally, the average value signal is converted into data of a desired output format in the H 2 O output converter 15 and output as the water concentration. At the same time, the oxygen pump current Ip is taken out as an oxygen concentration component after being smoothed by the low-pass filter 16 after subtracting the previous water concentration component in the subtractor 17 from the AC component extracted by the AC separation circuit. It is converted into data in a desired output format in the two- output converter 18 and output as oxygen concentration.
【００１１】上述した構成の装置においては、長時間ジ
ルコニア酸素ポンプ６を使用すると、H2O の電気分解に
よりＨ+ イオンが電極にチャージされるため、定期的に
出力信号をホールドしてV1≦０として交流信号の重畳分
で酸素ポンプ６の電極にチャージしたＨ+ イオンをディ
スチャージすることが好ましい。その後、交流信号をof
f して、酸素ポンプ６の印加電圧をキャパシタ20、及び
抵抗19からなるランプ信号回路からのランプ信号で徐々
に増加させ、このときのIpを計測してRp＋rl＋Ro＝Vp／
Ipを演算で求め、ほぼ一定の値が継続する期間のVp／Ip
をジルコニア酸素ポンプ６の内部抵抗およびリード線の
抵抗、Ipの検出抵抗の和とすることが好ましい。When the zirconia oxygen pump 6 is used for a long time in the apparatus having the above-mentioned structure, the H + ions are charged in the electrodes by the electrolysis of H 2 O, so that the output signal is periodically held and V 1 ≤ It is preferable to set 0 to discharge the H + ions charged in the electrode of the oxygen pump 6 by the superimposed portion of the AC signal. After that, the AC signal of
Then, the applied voltage of the oxygen pump 6 is gradually increased by the ramp signal from the ramp signal circuit composed of the capacitor 20 and the resistor 19, and Ip at this time is measured to obtain Rp + rl + Ro = Vp /
Ip is calculated, and Vp / Ip during the period when a nearly constant value continues
Is preferably the sum of the internal resistance of the zirconia oxygen pump 6, the resistance of the lead wire, and the detection resistance of Ip.
【００１２】また、酸素ポンプ電流より排ガス中の酸素
濃度を求め、予め酸素ポンプ６のギャップ側の酸素濃度
を0.002 ppm として、ネルンストの酸素濃淡電池の発生
起電力EMF をEMF ＝(RT ／nF）Log(O2／0.002)から求
め、このEMF をジルコニア酸素ポンプ６に供給する基準
限界電圧V1とすることが好ましい。なお、V1は大気エア
で換算して500 〜700 ｍＶが好ましい。Further, the oxygen concentration in the exhaust gas is obtained from the oxygen pump current, the oxygen concentration on the gap side of the oxygen pump 6 is set to 0.002 ppm in advance, and the electromotive force EMF generated by the Nernst oxygen concentration battery is EMF = (RT / nF) It is preferable to obtain it from Log (O 2 /0.002) and set this EMF as the reference limit voltage V1 to be supplied to the zirconia oxygen pump 6. In addition, V1 is preferably 500 to 700 mV in terms of atmospheric air.
【００１３】さらに、重畳する交流電圧をＦ(t) とし
て、一定の周期で同一の波形が繰り返えされ、かつ−１
≦Ｆ（ｔ）≦１を満たす電圧であれば何でも使用するこ
とができ、例えば三角波、ノコギリ波等を使用すること
ができる。なお、V1＋Ａ（１＋Ｆ(t))の電圧は、酸素ポ
ンプ６のジルコニア磁器の黒化を引き起こす電圧を越え
ない電圧とすることが好ましい。Further, the same waveform is repeated at a constant cycle with the superimposed AC voltage as F (t), and -1
Any voltage that satisfies ≦ F (t) ≦ 1 can be used, and for example, a triangular wave or a sawtooth wave can be used. It is preferable that the voltage of V1 + A (1 + F (t)) does not exceed the voltage that causes blackening of the zirconia porcelain of the oxygen pump 6.
【００１４】図２は本発明における交流電圧を重畳する
際の状態を説明するためのグラフである。図２におい
て、Ｘ軸は設定電圧Vpを、Ｙ軸は酸素ポンプ電流Ipを示
しており、Ioを基準にIoより酸素ポンプ電流が小さい領
域が酸素ガス領域を、Ioより酸素ポンプ電流が大きい領
域が水蒸気を含む水蒸気領域をそれぞれ示している。な
お、ここでは、理解を簡単にするため、実際に印加する
電圧からIp*(Rp＋rl＋Ro) を除いて表示している。ここ
で、図２に示すように、水蒸気を電気分解しないような
第１の設定電圧V1を酸素ガス領域にとり、水蒸気を電気
分解するような第２の設定電圧V2を水蒸気領域にとる
と、交流電圧Ｆ(t) を重畳したVpはV1とV2との間を繰り
返すこととなる。この状態のIpの変化は図２に示すよう
になり、斜線で囲んだ交流分１周期を整流しローパスフ
ィルタを通過させて平均値をとれば、従来のΔIp＝（Ip
2 −Ip1 ）に対応した値を得ることができる。FIG. 2 is a graph for explaining the state when the AC voltage is superimposed in the present invention. In FIG. 2, the X-axis shows the set voltage Vp, and the Y-axis shows the oxygen pump current Ip. The region where the oxygen pump current is smaller than Io is the oxygen gas region, and the region where the oxygen pump current is larger than Io is based on Io. Indicates the water vapor region containing water vapor. In addition, here, in order to facilitate understanding, Ip * (Rp + rl + Ro) is excluded from the actually applied voltage. Here, as shown in FIG. 2, if the first set voltage V1 that does not electrolyze water vapor is taken in the oxygen gas region and the second set voltage V2 that electrolyze water vapor is taken in the water vapor region, an alternating current Vp superimposed with the voltage F (t) repeats between V1 and V2. The change of Ip in this state is as shown in Fig. 2. If one cycle of the AC component surrounded by the diagonal line is rectified and passed through a low-pass filter and the average value is taken, the conventional ΔIp = (Ip
2 −Ip1) can be obtained.
【００１５】[0015]
【発明の効果】以上の説明から明らかなように、本発明
によれば、酸素ポンプに印加する電圧として交流分を含
む所定の電圧を使用しているため、ジルコニア酸素ポン
プ１個で排ガス中の酸素濃度と水分濃度とを測定するこ
とができる。また、長時間使用してもジルコニア酸素ポ
ンプの劣化が少なく、水分濃度の測定精度を高く維持す
ることができる。さらに、好ましい実施例においては、
ジルコニア酸素ポンプの電極界面の抵抗増加に対して定
期的に抵抗補正をすることができる。As is apparent from the above description, according to the present invention, since a predetermined voltage including an AC component is used as a voltage applied to the oxygen pump, a single zirconia oxygen pump can be used to remove the exhaust gas from the exhaust gas. The oxygen concentration and the water concentration can be measured. Further, even if the zirconia oxygen pump is used for a long time, deterioration of the zirconia oxygen pump is small, and the measurement accuracy of the water concentration can be kept high. Furthermore, in a preferred embodiment,
The resistance can be periodically corrected for the increase in resistance at the electrode interface of the zirconia oxygen pump.
【図１】本発明の排ガス中の水分濃度および酸素濃度の
測定方法を実施する装置の一例の構造を示すブロック図
である。FIG. 1 is a block diagram showing a structure of an example of an apparatus for carrying out a method for measuring a water concentration and an oxygen concentration in exhaust gas according to the present invention.
【図２】本発明における交流電圧を重畳する際の状態を
説明するためのグラフである。FIG. 2 is a graph for explaining a state when an AC voltage is superimposed in the present invention.
１ 加算器 ２〜４ 信号発生器 ５, 12, 19 抵抗 ６ 酸素ポンプ ７ 差動増巾器 ８ 割算処理部 ９ 信号入力部 11, 20 キャパシタ 13 整流器 14, 16 ローパスフィルタ 15 H2O 出力変換器 17 減算器 18 O2出力変換器1 Adder 2-4 Signal generator 5, 12, 19 Resistance 6 Oxygen pump 7 Differential amplifier 8 Division processing unit 9 Signal input unit 11, 20 Capacitor 13 Rectifier 14, 16 Low pass filter 15 H 2 O Output conversion Device 17 Subtractor 18 O 2 output converter
Claims (5)
を印加し、 【数１】 Vp＝V1＋((V2−V1)/2)＊(1＋Ｆ(t))＋Ip＊(Rp ＋rl＋Ro) ここで、 V1 ：排ガス中の水蒸気を電気分解しないような第
１の設定電圧、 V2 ：排ガス中の水蒸気を電気分解するような第２
の設定電圧、 F(t) ：重畳する交流電圧、ただし−１≦Ｆ(t) ≦
１、 Ip ：酸素ポンプ電流 Rp ：酸素ポンプの内部抵抗 rl ：リード線の抵抗 Ro ：Ipの検出抵抗 酸素ポンプ電流Ipの交流分を取り出し、整流し、ローパ
スフィルタで平滑化した平均値信号を水分信号として得
るとともに、酸素ポンプ電流IpからIpの交流分を引き算
した信号を酸素濃度信号として得、得られた水分信号お
よび酸素濃度信号から排ガス中の水分濃度および酸素濃
度を測定することを特徴とする排ガス中の水分濃度およ
び酸素濃度の測定方法。1. A voltage Vp represented by the following formula for an oxygen pump:
Vp = V1 + ((V2-V1) / 2) * (1 + F (t)) + Ip * (Rp + rl + Ro) where V1 is the first such that steam in the exhaust gas is not electrolyzed. Set voltage, V2: Second such as electrolyzing water vapor in exhaust gas
Set voltage, F (t): AC voltage to be superimposed, -1≤F (t) ≤
1, Ip: Oxygen pump current Rp: Oxygen pump internal resistance rl: Lead wire resistance Ro: Ip detection resistance The AC component of the oxygen pump current Ip is extracted, rectified, and smoothed by a low-pass filter A signal obtained by subtracting the alternating current component of Ip from the oxygen pump current Ip is obtained as an oxygen concentration signal, and the moisture concentration and oxygen concentration in the exhaust gas are measured from the obtained moisture signal and oxygen concentration signal. Method for measuring water concentration and oxygen concentration in exhaust gas.
る請求項１記載の排ガス中の水分濃度および酸素濃度の
測定方法。2. The method for measuring a water concentration and an oxygen concentration in exhaust gas according to claim 1, wherein the AC voltage F (t) is sin (ωt).
を求め、予め酸素ポンプのギャップの濃度を0.002 ppm
として、ネルンストの酸素濃淡電池の発生起電力EMF を 【数２】EMF ＝(RT/nF) ×LOG(O2／0.002 ） として、 【数３】V1＝EMF と限界電流に対応した基準酸素ポンプ電圧を作ることを
特徴とする請求項１記載の排ガス中の水分濃度および酸
素濃度の測定方法。3. The oxygen concentration in the exhaust gas is obtained from the oxygen pump current, and the concentration of the oxygen pump gap is set to 0.002 ppm in advance.
And the electromotive force EMF generated by the Nernst oxygen concentration battery is [Equation 2] EMF = (RT / nF) x LOG (O 2 /0.002), and [Equation 3] V1 = EMF and the reference oxygen pump corresponding to the limiting current. The method for measuring the water content and oxygen content in the exhaust gas according to claim 1, wherein a voltage is created.
圧とする請求項１記載の排ガス中の水分濃度および酸素
濃度の測定方法。4. Moisture in the exhaust gas according to claim 1, wherein V1 + ((V2-V1) / 2) * (1 + F (t)) does not exceed the voltage causing blackening of the zirconia porcelain. Method of measuring concentration and oxygen concentration.
０にセットして、酸素ポンプの電極にチャージしたＨ＋
イオンを交流信号によりディスチャージし、交流信号を
off して、徐々にVpを増加しながらIpを計測して、Rp＋
rl＋Ro＝Vp／IpとしてRp＋rl＋Roの値が近似的に一定と
なる範囲の値となるRp＋rl＋Roを求めることを特徴とす
る請求項１記載の排ガス中の水分濃度および酸素濃度の
測定方法。5. An output signal is periodically held to hold V1 ≦.
H + charged to the oxygen pump electrode set to 0
Ions are discharged by an AC signal, and the AC signal is
Turn off, measure Ip while gradually increasing Vp, Rp +
The method for measuring the water concentration and the oxygen concentration in the exhaust gas according to claim 1, wherein Rp + rl + Ro is obtained as a value in a range in which the value of Rp + rl + Ro is approximately constant as rl + Ro = Vp / Ip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29893792A JP3162836B2 (en) | 1992-11-09 | 1992-11-09 | Measuring method of water concentration and oxygen concentration in exhaust gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29893792A JP3162836B2 (en) | 1992-11-09 | 1992-11-09 | Measuring method of water concentration and oxygen concentration in exhaust gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06148130A true JPH06148130A (en) | 1994-05-27 |
| JP3162836B2 JP3162836B2 (en) | 2001-05-08 |
Family
ID=17866122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29893792A Expired - Fee Related JP3162836B2 (en) | 1992-11-09 | 1992-11-09 | Measuring method of water concentration and oxygen concentration in exhaust gas |
Country Status (1)
| Country | Link |
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| JP (1) | JP3162836B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018189502A (en) * | 2017-05-08 | 2018-11-29 | 日本特殊陶業株式会社 | Gas concentration detector |
| JP2019515292A (en) * | 2016-05-02 | 2019-06-06 | コンチネンタル オートモーティヴ ゲゼルシャフト ミット ベシュレンクテル ハフツングＣｏｎｔｉｎｅｎｔａｌ Ａｕｔｏｍｏｔｉｖｅ ＧｍｂＨ | How the probe works |
-
1992
- 1992-11-09 JP JP29893792A patent/JP3162836B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019515292A (en) * | 2016-05-02 | 2019-06-06 | コンチネンタル オートモーティヴ ゲゼルシャフト ミット ベシュレンクテル ハフツングＣｏｎｔｉｎｅｎｔａｌ Ａｕｔｏｍｏｔｉｖｅ ＧｍｂＨ | How the probe works |
| US10845331B2 (en) | 2016-05-02 | 2020-11-24 | Vitesco Technologies GmbH | Method for operating an internal combustion engine |
| JP2018189502A (en) * | 2017-05-08 | 2018-11-29 | 日本特殊陶業株式会社 | Gas concentration detector |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3162836B2 (en) | 2001-05-08 |
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