JPH0247561U - - Google Patents
Info
- Publication number
- JPH0247561U JPH0247561U JP12702488U JP12702488U JPH0247561U JP H0247561 U JPH0247561 U JP H0247561U JP 12702488 U JP12702488 U JP 12702488U JP 12702488 U JP12702488 U JP 12702488U JP H0247561 U JPH0247561 U JP H0247561U
- Authority
- JP
- Japan
- Prior art keywords
- air
- oxygen concentration
- gas
- fuel
- 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.)
- Granted
Links
- 239000000446 fuel Substances 0.000 claims description 10
- 230000035945 sensitivity Effects 0.000 claims description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 5
- 239000007789 gas Substances 0.000 claims 5
- 229910052760 oxygen Inorganic materials 0.000 claims 5
- 239000001301 oxygen Substances 0.000 claims 5
- 238000005086 pumping Methods 0.000 claims 3
- 229910052799 carbon Inorganic materials 0.000 claims 2
- 238000001514 detection method Methods 0.000 claims 1
- 238000009792 diffusion process Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
Landscapes
- Measuring Oxygen Concentration In Cells (AREA)
Description
第１図はこの考案の一実施例のブロツク図、第
２図は空燃比検出器により空燃比を検出する原理
を説明するための回路図である。
１ａ〜１ｄ…空燃比検出器、１１ａ〜１１ｄ…
駆動回路、２１ａ〜２１ｄ…電流電圧変換回路、
２２…Ａ／Ｄ変換回路、２３ａ〜２３ｄ…感度係
数設定用のデジタルスイツチ、２４…水炭比設定
用のデジタルスイツチ、３１…演算回路、３２…
インターフエース、３３…ＣＰＵ、３４…メモリ
、３５…表示器、４１…マルチプレクサ。
FIG. 1 is a block diagram of an embodiment of this invention, and FIG. 2 is a circuit diagram for explaining the principle of detecting an air-fuel ratio by an air-fuel ratio detector. 1a to 1d...Air-fuel ratio detector, 11a to 11d...
Drive circuit, 21a to 21d... current voltage conversion circuit,
22... A/D conversion circuit, 23a to 23d... Digital switch for setting sensitivity coefficient, 24... Digital switch for setting water-to-coal ratio, 31... Arithmetic circuit, 32...
Interface, 33...CPU, 34...Memory, 35...Display device, 41...Multiplexer.
Claims (1)
素濃度検出の動作とポンピング動作をそれぞれ行
うジルコニア板と、各ジルコニア板の両主面に形
成された電極と、両ジルコニア板の間に設けられ
被測定ガスの導かれる中空室と、この中空室への
被測定ガスの拡散速度を律する部位とからなる空
燃比検出器と、前記酸素濃度検出の動作を行うジ
ルコニア板の中空室側電極近傍の酸素濃度が常に
予め定めた基準値と一致するように、前記各空燃
比検出器へのポンピング電流を制御する回路と、
前記各空燃比検出器の被測定ガス中の特定ガス成
分濃度に対する感度係数をそれぞれ設定する手段
と、燃料の種類に応じて決定される水炭比を設定
する手段と、予め設定された数値の異なる複数の
空燃比および当量比のいずれか一方と前記水炭比
の設定値とから、予定の演算式に基づいて空燃比
および当量比のいずれか一方とこれに対応する酸
素濃度との関係を示す数値対応表を作成する手段
と、この数値対応表を記憶する手段と、前記ポン
ピング電流からそのときの酸素濃度を気筒別に算
出する手段と、この気筒別の酸素濃度に対応する
空燃比を前記数値対応表を用いて算出する手段と
を備えることを特徴とする多気筒エンジンの空燃
比計測装置。 A zirconia plate is attached to each cylinder of the engine and performs the oxygen concentration detection operation and the pumping operation, respectively, an electrode is formed on both main surfaces of each zirconia plate, and a zirconia plate is installed between the two zirconia plates to detect the gas to be measured. The air-fuel ratio detector consists of a hollow chamber to which the gas is guided, and a part that controls the diffusion rate of the gas to be measured into the hollow chamber, and the oxygen concentration near the electrode on the hollow chamber side of the zirconia plate that performs the operation of detecting the oxygen concentration is always maintained. a circuit that controls pumping current to each of the air-fuel ratio detectors so as to match a predetermined reference value;
means for setting a sensitivity coefficient for each of the air-fuel ratio detectors with respect to the concentration of a specific gas component in the gas to be measured, means for setting a water-to-carbon ratio determined according to the type of fuel, and means for setting a preset numerical value. From one of a plurality of different air-fuel ratios and equivalence ratios and the set value of the water-to-carbon ratio, the relationship between one of the air-fuel ratios and equivalence ratios and the corresponding oxygen concentration is determined based on a predetermined calculation formula. means for creating a numerical correspondence table indicating the numerical correspondence; means for storing the numerical correspondence table; means for calculating the oxygen concentration at that time for each cylinder from the pumping current; 1. An air-fuel ratio measuring device for a multi-cylinder engine, comprising means for calculating using a numerical correspondence table.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12702488U JPH0738849Y2 (en) | 1988-09-28 | 1988-09-28 | Air-fuel ratio measuring device for multi-cylinder engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12702488U JPH0738849Y2 (en) | 1988-09-28 | 1988-09-28 | Air-fuel ratio measuring device for multi-cylinder engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0247561U true JPH0247561U (en) | 1990-03-30 |
| JPH0738849Y2 JPH0738849Y2 (en) | 1995-09-06 |
Family
ID=31379073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12702488U Expired - Lifetime JPH0738849Y2 (en) | 1988-09-28 | 1988-09-28 | Air-fuel ratio measuring device for multi-cylinder engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0738849Y2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006284358A (en) * | 2005-03-31 | 2006-10-19 | Ngk Spark Plug Co Ltd | Gas sensor control device |
| JP2007127540A (en) * | 2005-11-04 | 2007-05-24 | Ngk Spark Plug Co Ltd | Sensor control device |
-
1988
- 1988-09-28 JP JP12702488U patent/JPH0738849Y2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006284358A (en) * | 2005-03-31 | 2006-10-19 | Ngk Spark Plug Co Ltd | Gas sensor control device |
| JP2007127540A (en) * | 2005-11-04 | 2007-05-24 | Ngk Spark Plug Co Ltd | Sensor control device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0738849Y2 (en) | 1995-09-06 |
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