JPH11237360A - Air-fuel ratio measuring device and its calibration method - Google Patents
Air-fuel ratio measuring device and its calibration methodInfo
- Publication number
- JPH11237360A JPH11237360A JP10056049A JP5604998A JPH11237360A JP H11237360 A JPH11237360 A JP H11237360A JP 10056049 A JP10056049 A JP 10056049A JP 5604998 A JP5604998 A JP 5604998A JP H11237360 A JPH11237360 A JP H11237360A
- Authority
- JP
- Japan
- Prior art keywords
- air
- fuel ratio
- measuring device
- oxygen concentration
- engine
- 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.)
- Pending
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000001301 oxygen Substances 0.000 claims abstract description 33
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 33
- 239000007789 gas Substances 0.000 claims abstract description 30
- 238000005259 measurement Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000009838 combustion analysis Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、空燃比センサで
測定し、その測定値に基づいて空燃比を求めるようにし
た空燃比測定装置とその校正方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-fuel ratio measuring device which measures an air-fuel ratio based on an air-fuel ratio sensor and obtains an air-fuel ratio based on the measured value.
【０００２】[0002]
【従来の技術】空燃比測定装置は、例えば自動車のエン
ジンの燃料供給系統の調整や空燃比制御精度の試験や燃
焼解析などを行う場合に不可欠の装置であり、一般的に
は、図１および図２に示すように構成されている。すな
わち、図１において、１はエンジン、２はその排気管、
３は排気マニホールドで、この排気マニホールド３に直
挿型の空燃比センサ４が取り付けられている。５，６は
空燃比センサ４よりも下流側の排気管２に設けられる触
媒ケース、マフラーである。2. Description of the Related Art An air-fuel ratio measuring device is an indispensable device for performing, for example, adjustment of a fuel supply system of an automobile engine, testing of air-fuel ratio control accuracy, and combustion analysis. It is configured as shown in FIG. That is, in FIG. 1, 1 is an engine, 2 is an exhaust pipe thereof,
Reference numeral 3 denotes an exhaust manifold to which a direct insertion type air-fuel ratio sensor 4 is attached. Reference numerals 5 and 6 denote catalyst cases and mufflers provided in the exhaust pipe 2 downstream of the air-fuel ratio sensor 4.
【０００３】そして、７は空燃比センサ４からの信号を
処理する測定装置本体で、空燃比センサ４に付設された
コネクタ付き信号線８ａおよび測定装置本体７に接続さ
れたコネクタ付き信号線８ｂを介して空燃比センサ４と
着脱自在に接続されている。この測定装置本体７は、図
２に示すように、信号変換回路９、ＡＤ変換回路１０、
演算処理部１１、演算結果を表示する表示装置１２およ
び入力装置１３などよりなり、空燃比センサ４からの出
力を演算処理したり、演算結果を表示あるいは記憶する
ものである。なお、演算処理部１１は、ＣＰＵ、各種制
御プログラムを収容したＲＯＭ、演算結果など各種のデ
ータを記憶するＲＡＭなどのメモリを備えている。[0003] Reference numeral 7 denotes a measuring device main body for processing a signal from the air-fuel ratio sensor 4, and a signal line 8 a with a connector attached to the air-fuel ratio sensor 4 and a signal line 8 b with a connector connected to the measuring device main body 7. It is detachably connected to the air-fuel ratio sensor 4 via the air-fuel ratio sensor. As shown in FIG. 2, the measuring device main body 7 includes a signal conversion circuit 9, an AD conversion circuit 10,
It comprises an arithmetic processing unit 11, a display device 12 for displaying the calculation results, an input device 13, and the like, and performs an arithmetic process on the output from the air-fuel ratio sensor 4, and displays or stores the calculation results. The arithmetic processing unit 11 includes a memory such as a CPU, a ROM storing various control programs, and a RAM storing various data such as calculation results.
【０００４】そして、上記のように構成された空燃比測
定装置において、空燃比センサ４の出力から燃料がリー
ン域（燃料の完全燃焼に必要な化学当量より空気が多い
燃焼状態）における空燃比Ａ／Ｆは、次のようにして求
められる。[0004] In the air-fuel ratio measuring device configured as described above, the air-fuel ratio A in the lean region (combustion state in which the air is larger than the chemical equivalent required for complete combustion of the fuel) based on the output of the air-fuel ratio sensor 4. / F is obtained as follows.
【０００５】すなわち、上記燃料（ＣＨm Ｏn ）がリー
ン域における空気過剰率λは、下記式（１）で表され
る。 λ＝１＋｛ＣO2／（２０．９−ＣO2）｝・〔１＋｛（ｍ／４＋ｎ／２）／ （１＋ｍ／４−ｎ／２）｝・０．２０９〕 ………（１） ここで、ＣO2は％で表した排気ガス中の酸素濃度、ｍは
燃料における水素と炭素との原子数比（Ｈ／Ｃ）、ｎは
燃料における酸素と炭素との原子数比（Ｏ／Ｃ）であ
る。Namely, the fuel (CH m O n) is the excess air ratio λ in the lean region, represented by the following formula (1). λ = 1 + {C O2 /(20.9−C O2 )} · [1 + {(m / 4 + n / 2) / (1 + m / 4−n / 2)} · 0.209] (1) Here Where C O2 is the oxygen concentration in the exhaust gas expressed in%, m is the atomic ratio of hydrogen and carbon in the fuel (H / C), and n is the atomic ratio of oxygen and carbon in the fuel (O / C). ).
【０００６】また、理論空燃比Ａ／Ｆo は、下記式
（２）で表される。 Ａ／Ｆo ＝２８．９６・（１＋ｍ／４−ｎ／２）／ （１２．０１１＋１．００８・ｍ＋１６・ｎ）・０．２０９ ………（２）The stoichiometric air-fuel ratio A / F o is represented by the following equation (2). A / F o = 28.96 · (1 + m / 4−n / 2) / (12.0011 + 1.008 · m + 16 · n) · 0.209 (2)
【０００７】そして、空燃比は、燃焼に使用される空気
と燃料の質量比であるから、空燃比Ａ／Ｆは、下記式
（３）で与えられる。 Ａ／Ｆ＝（Ａ／Ｆo ）・λ ………（３）Since the air-fuel ratio is the mass ratio of air and fuel used for combustion, the air-fuel ratio A / F is given by the following equation (3). A / F = (A / F o ) · λ (3)
【０００８】従来の空燃比測定装置においては、校正ガ
スに対する空燃比センサ４の出力信号と既知の校正ガス
の酸素濃度から空燃比センサ４の出力と酸素濃度の関係
を求めて測定装置本体７の演算処理部１１に記憶し、排
気ガスを測定した空燃比センサ４の出力から未知の酸素
濃度を求め、上記式（１）から空気過剰率λを求めてい
た。In the conventional air-fuel ratio measuring device, the relationship between the output of the air-fuel ratio sensor 4 and the oxygen concentration is determined from the output signal of the air-fuel ratio sensor 4 for the calibration gas and the known oxygen concentration of the calibration gas. The unknown oxygen concentration was obtained from the output of the air-fuel ratio sensor 4 which was stored in the arithmetic processing unit 11 and measured the exhaust gas, and the excess air ratio λ was obtained from the above equation (1).
【０００９】[0009]
【発明が解決しようとする課題】ここで、正確な空燃比
Ａ／Ｆを測定するためには、正確な酸素濃度の測定が必
要であり、このため正確な濃度が既知である高価な標準
ガスを使って空燃比センサ４の校正が行われていた。こ
の場合でも、空燃比測定の誤差は、再現性や直線性など
の空燃比センサ４固有の誤差要因のほかに、校正ガスの
濃度の誤差が加わるのが避けられない。Here, in order to accurately measure the air-fuel ratio A / F, it is necessary to accurately measure the oxygen concentration, and therefore, an expensive standard gas whose exact concentration is known is used. Was used to calibrate the air-fuel ratio sensor 4. Even in this case, the error in the measurement of the air-fuel ratio is unavoidably added to the error of the concentration of the calibration gas in addition to the error factors unique to the air-fuel ratio sensor 4 such as reproducibility and linearity.
【００１０】また、従来の空燃比測定装置における計算
式は、前記式（１）で示すように、吸入空気（燃焼に供
せられる空気）の酸素濃度を例えば２０．９％というよ
うに定数として固定されていることが多かったが、エン
ジン１に吸入される空気の酸素濃度は、大気の湿度など
によって変化するため、測定の都度、吸入空気中の酸素
濃度を正確に求め、これを計算式に組み込む必要があっ
た。In addition, the calculation formula in the conventional air-fuel ratio measuring device is expressed as a constant such that the oxygen concentration of the intake air (air used for combustion) is, for example, 20.9% as shown in the above formula (1). Although it is often fixed, the oxygen concentration of the air taken into the engine 1 changes depending on the humidity of the atmosphere and the like. Had to be incorporated into
【００１１】上述のように、従来の空燃比測定装置にお
いては、精度よく空燃比を測定するために、大変煩わし
い作業を行う必要があった。As described above, in the conventional air-fuel ratio measuring device, it is necessary to perform a very troublesome operation in order to accurately measure the air-fuel ratio.
【００１２】この発明は、上述の事柄に留意してなされ
たもので、その目的は、高精度で空燃比を測定すること
ができる空燃比測定装置を提供することおよび簡便かつ
安価にセンサの校正を行うことができる空燃比測定装置
の校正方法を提供することである。SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned circumstances, and has as its object to provide an air-fuel ratio measuring device capable of measuring an air-fuel ratio with high accuracy, and to provide a simple and inexpensive sensor calibration. To provide a method for calibrating an air-fuel ratio measuring device capable of performing the following.
【００１３】[0013]
【課題を解決するための手段】上記目的を達成するた
め、この発明では、エンジンからの排気ガスを空燃比セ
ンサで測定し、その測定値に基づいて空燃比を求めるよ
うにした空燃比測定装置において、校正ガスとしてエン
ジンに吸引される空気を用い、空燃比センサの出力を、
吸入空気の酸素濃度を基準として校正し、排気ガス中の
酸素濃度と吸入空気の酸素濃度との比を求め、この比を
用いて空燃比を計算するようにしている。In order to achieve the above object, according to the present invention, there is provided an air-fuel ratio measuring apparatus which measures an exhaust gas from an engine with an air-fuel ratio sensor and obtains an air-fuel ratio based on the measured value. In, using air sucked into the engine as a calibration gas, the output of the air-fuel ratio sensor,
Calibration is performed based on the oxygen concentration of the intake air, the ratio between the oxygen concentration in the exhaust gas and the oxygen concentration in the intake air is determined, and the air-fuel ratio is calculated using this ratio.
【００１４】そして、この発明では、エンジンからの排
気ガスを空燃比センサで測定し、その測定値に基づいて
空燃比を求めるようにした空燃比測定装置において、校
正ガスとしてエンジンに吸引される空気を用い、計算式
に組み込まれた空気中の酸素濃度にセンサの出力を合わ
せるようにして校正を行っている。According to the present invention, in an air-fuel ratio measuring device in which exhaust gas from an engine is measured by an air-fuel ratio sensor and an air-fuel ratio is obtained based on the measured value, air sucked into the engine as a calibration gas The calibration is performed by adjusting the output of the sensor to the oxygen concentration in the air incorporated in the calculation formula.
【００１５】[0015]
【発明の実施の形態】発明の実施の形態を図面を参照し
ながら説明する。この発明の空燃比測定装置は、その構
成は、図１および図２に示したものと変わるところがな
い。Embodiments of the present invention will be described with reference to the drawings. The configuration of the air-fuel ratio measuring apparatus of the present invention is the same as that shown in FIGS.
【００１６】まず、この発明の空燃比測定装置の校正方
法は、空燃比センサ４の校正ガスとして、エンジン１に
吸入される空気と同じ空気を用い、その濃度を実際の酸
素濃度ではなく、例えば２０．９％として校正し、前記
式（１）に基づいて空気過剰率λを計算するのである。
このようにすることにより、高価な標準ガスを用いるこ
となく簡便に空燃比センサ４の校正を行うことができ
る。First, in the calibration method of the air-fuel ratio measuring device of the present invention, the same air as the air taken into the engine 1 is used as the calibration gas of the air-fuel ratio sensor 4, and the concentration is not the actual oxygen concentration but, for example, Calibration is performed at 20.9%, and the excess air ratio λ is calculated based on the equation (1).
In this way, the air-fuel ratio sensor 4 can be easily calibrated without using expensive standard gas.
【００１７】ところで、前記式（１）を詳細に調べる
と、排気ガス中の酸素濃度ＣO2と、大気の酸素濃度の相
対誤差は、空気過剰率λの計算に同程度の誤差（影響）
を与えることがわかる。これは、式（１）を変形して得
られる下記式（４）を見れば明らかである。When the above equation (1) is examined in detail, it is found that the relative error between the oxygen concentration C O2 in the exhaust gas and the oxygen concentration in the atmosphere is substantially the same as the error (effect) in the calculation of the excess air ratio λ.
It turns out that giving. This is apparent from the following equation (4) obtained by modifying equation (1).
【００１８】 λ＝１＋｛（ＰO2／ＰａO2）／（１−ＰO2／ＰａO2）｝・〔１＋｛（ｍ／４ ＋ｎ／２）／（１＋ｍ／４−ｎ／２）｝・ＰａO2〕 ………（４） ここで、ＰO2は排気ガス中の酸素の体積割合（濃度）、
ＰａO2は吸入空気中の酸素の体積割合である。Λ = 1 + {( PO2 / PaO2 ) / (1- PO2 / PaO2 )}. [1 + {(m / 4 + n / 2) / (1 + m / 4-n / 2)}. Pa O2 ] (4) Here, P O2 is a volume ratio (concentration) of oxygen in the exhaust gas,
Pa O2 is the volume ratio of oxygen in the intake air.
【００１９】前記式（４）を用いて空気過剰率λを計算
する場合、排気ガス中の酸素濃度を知る必要がないこと
がわかる。つまり、排気ガス中の酸素の体積割合を酸素
濃度としてではなく、吸入空気の酸素の体積割合との比
ＰO2／ＰａO2として空燃比を計算すればよい。より具体
的には、吸入空気を測定したときの空燃比センサ４の出
力信号を測定装置本体７の演算処理部１１に記憶し、排
気ガスを測定したときの空燃比センサ４の出力信号を、
前記記憶した出力信号で割算することにより、排気ガス
中の酸素の体積割合と吸入空気中の酸素の体積割合との
比ＰO2／ＰａO2を求め、この比ＰO2／ＰａO2を前記式
（４）に代入すればよい。When calculating the excess air ratio λ using the above equation (4), it is understood that it is not necessary to know the oxygen concentration in the exhaust gas. That is, the air-fuel ratio may be calculated not as the oxygen concentration in the exhaust gas but as the ratio P O2 / Pa O2 with respect to the oxygen volume ratio in the intake air. More specifically, the output signal of the air-fuel ratio sensor 4 when measuring the intake air is stored in the arithmetic processing unit 11 of the measuring device main body 7, and the output signal of the air-fuel ratio sensor 4 when measuring the exhaust gas is
By dividing by the stored output signal, a ratio P O2 / Pa O2 of the volume ratio of oxygen in the exhaust gas to the volume ratio of oxygen in the intake air is obtained, and this ratio P O2 / Pa O2 is calculated by the above equation. What is necessary is just to substitute for (4).
【００２０】したがって、この発明の空燃比測定装置に
よれば、吸入空気の酸素濃度を計算式に設定しなくても
よく、従来に比べてはるかに簡単に空燃比を求めること
ができ、しかも、校正ガスの酸素濃度値の誤差が空燃比
の計算に影響を与えることがないから、空燃比を高精度
で測定することができる。Therefore, according to the air-fuel ratio measuring apparatus of the present invention, it is not necessary to set the oxygen concentration of the intake air in the calculation formula, and the air-fuel ratio can be obtained much more easily than in the conventional case. Since the error in the oxygen concentration value of the calibration gas does not affect the calculation of the air-fuel ratio, the air-fuel ratio can be measured with high accuracy.
【００２１】[0021]
【発明の効果】この発明の空燃比測定装置の校正方法に
よれば、高価な標準ガスを用いることなく安価かつ簡便
に空燃比センサの校正を行うことができる。According to the method of calibrating the air-fuel ratio measuring apparatus of the present invention, the air-fuel ratio sensor can be calibrated inexpensively and easily without using expensive standard gas.
【００２２】そして、この発明の空燃比測定装置によれ
ば、安価かつ簡便に校正が行なえるとともに、吸入空気
の酸素濃度を計算式に設定しなくてもよく、従来に比べ
てはるかに簡単に空燃比を求めることができ、校正ガス
の酸素濃度値の誤差が空燃比の計算に影響を与えること
がないから、特にリーン域における空燃比を高精度で測
定することができる。According to the air-fuel ratio measuring apparatus of the present invention, calibration can be performed inexpensively and easily, and the oxygen concentration of the intake air does not need to be set in a calculation formula, which is much easier than in the past. Since the air-fuel ratio can be obtained and the error in the oxygen concentration value of the calibration gas does not affect the calculation of the air-fuel ratio, the air-fuel ratio can be measured with high accuracy, particularly in the lean region.
【図１】この発明の空燃比測定装置の空燃比センサの取
り付け状態および全体構成を概略的に示す図である。FIG. 1 is a diagram schematically showing an attached state and an overall configuration of an air-fuel ratio sensor of an air-fuel ratio measuring device of the present invention.
【図２】前記空燃比測定装置の構成を概略的に示すブロ
ック図である。FIG. 2 is a block diagram schematically showing a configuration of the air-fuel ratio measuring device.
１…エンジン、４…空燃比センサ。 1 ... engine, 4 ... air-fuel ratio sensor.
Claims (2)
で測定し、その測定値に基づいて空燃比を求めるように
した空燃比測定装置において、校正ガスとしてエンジン
に吸引される空気を用い、空燃比センサの出力を、吸入
空気の酸素濃度を基準として校正し、排気ガス中の酸素
濃度と吸入空気の酸素濃度との比を求め、この比を用い
て空燃比を計算するようにしたことを特徴とする空燃比
測定装置。1. An air-fuel ratio measuring device which measures exhaust gas from an engine with an air-fuel ratio sensor and obtains an air-fuel ratio based on the measured value, using air sucked into the engine as a calibration gas, The output of the fuel ratio sensor was calibrated based on the oxygen concentration of the intake air, the ratio of the oxygen concentration in the exhaust gas to the oxygen concentration of the intake air was determined, and the air-fuel ratio was calculated using this ratio. Characteristic air-fuel ratio measurement device.
で測定し、その測定値に基づいて空燃比を求めるように
した空燃比測定装置において、校正ガスとしてエンジン
に吸引される空気を用い、計算式に組み込まれた空気中
の酸素濃度にセンサの出力を合わせるようにしたことを
特徴とする空燃比測定装置の校正方法。2. An air-fuel ratio measuring device which measures exhaust gas from an engine with an air-fuel ratio sensor and obtains an air-fuel ratio based on the measured value, using air sucked into the engine as a calibration gas and calculating the air-fuel ratio. A method for calibrating an air-fuel ratio measuring device, wherein the output of a sensor is adjusted to the oxygen concentration in air incorporated in the equation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10056049A JPH11237360A (en) | 1998-02-20 | 1998-02-20 | Air-fuel ratio measuring device and its calibration method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10056049A JPH11237360A (en) | 1998-02-20 | 1998-02-20 | Air-fuel ratio measuring device and its calibration method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11237360A true JPH11237360A (en) | 1999-08-31 |
Family
ID=13016239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10056049A Pending JPH11237360A (en) | 1998-02-20 | 1998-02-20 | Air-fuel ratio measuring device and its calibration method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11237360A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6789533B1 (en) | 2003-07-16 | 2004-09-14 | Mitsubishi Denki Kabushiki Kaisha | Engine control system |
-
1998
- 1998-02-20 JP JP10056049A patent/JPH11237360A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6789533B1 (en) | 2003-07-16 | 2004-09-14 | Mitsubishi Denki Kabushiki Kaisha | Engine control system |
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