JP4222101B2 - Gas measuring method and gas measuring device - Google Patents

Gas measuring method and gas measuring device Download PDF

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JP4222101B2
JP4222101B2 JP2003139459A JP2003139459A JP4222101B2 JP 4222101 B2 JP4222101 B2 JP 4222101B2 JP 2003139459 A JP2003139459 A JP 2003139459A JP 2003139459 A JP2003139459 A JP 2003139459A JP 4222101 B2 JP4222101 B2 JP 4222101B2
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concentration
fuel injection
exhaust gas
gas
cylinders
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JP2004340834A (en
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勇 中田
信久 森
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Toyota Motor Corp
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Toyota Motor Corp
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Description

【０００１】
【発明の属する技術分野】
本発明は、内燃機関の排気ガスの流動状態を計測するガス計測方法及びガス計測装置に関するものである。
【０００２】
【従来の技術】
従来、内燃機関のガス計測装置として、特開２００１−１２４６７４号公報に記載されるように、エンジンの排気管にトレーサガスとして六フッ化硫黄を注入し、排気管における注入位置の下流側で排気ガスの各成分の濃度をトレーサガスの濃度と同時に連続分析するものが知られている。この装置は、トレーサガスの濃度を検出し、そのトレーサガスの濃度に基づいて排気ガスの排出重量を検出しようとするものである。
【０００３】
【特許文献１】
特開２００１−１２４６７４号公報
【０００４】
【発明が解決しようとする課題】
しかしながら、このようなガス計測装置にあっては、トレーサガスを排気管の途中から注入する必要があり、ガス計測に必要な設備が大掛かりになってしまう。このため、より簡易な設備によって排気ガスの計測が行える技術開発が切望されている。
【０００５】
そこで本発明は、このような技術課題に鑑みてなされたものであって、簡易に排気ガスの計測が行えるガス計測方法及びガス計測装置を提供することを目的とする。
【０００６】
【課題を解決するための手段】
すなわち、本発明に係るガス計測方法は、内燃機関の排気ガスを計測するガス計測方法であって、内燃機関の複数ある気筒のうち一部の気筒の燃料噴射量を他の気筒に対し増量又は減量して燃料噴射を行う燃料噴射工程と、内燃機関の排気系の複数の計測ポイントにおいて燃料噴射量の増減に伴って増加する排気ガス中の特定成分の濃度を検出する濃度検出工程と、特定成分の濃度変化に基づいて排気ガスの流動状態を演算する演算工程とを備えて構成される。
【０００７】
また本発明に係るガス計測方法は、前述の燃料噴射工程では内燃機関の複数ある気筒のうち一部の気筒の燃料噴射量を他の気筒に対し増量して燃料噴射を行い、前述の濃度検出工程では排気ガスに含まれる炭化水素の濃度を検出し、前述の演算工程では炭化水素の濃度変化に基づいて排気ガスの流動状態を演算することを特徴とする。
【０００８】
また本発明に係るガス計測装置は、内燃機関の排気ガスを計測するガス計測装置において、内燃機関の複数ある気筒のうち一部の気筒の燃料噴射量を他の気筒に対し増量又は減量して燃料噴射を行う燃料噴射制御手段と、内燃機関の排気系の複数の計測ポイントにおいて燃料噴射量の増減に伴って増加する排気ガス中の特定成分の濃度を検出する濃度検出手段と、特定成分の濃度変化に基づいて排気ガスの流動状態を演算する演算手段とを備えて構成される。
【０００９】
また本発明に係るガス計測装置は、前述の燃料噴射手段が内燃機関の複数ある気筒のうち一部の気筒の燃料噴射量を他の気筒に対し増量して燃料噴射を行い、前述の濃度検出手段が排気ガスに含まれる炭化水素の濃度を検出し、前述の演算手段が炭化水素の濃度変化に基づいて排気ガスの流動状態を演算することを特徴とする。
【００１０】
これらの発明によれば、一部の気筒の燃料噴射量を増量又は減量することにより、意図的に燃料を不完全燃焼させて排気ガス中に炭化水素などの特定の成分を増加させ、その成分濃度を検出することで排気ガスの流動状態を演算する。このため、燃料とは別個にトレーサガスを注入する必要がない。従って、簡易設備で排気ガスの計測が可能となる。
【００１１】
【発明の実施の形態】
以下、添付図面を参照して本発明の実施の形態を詳細に説明する。なお、図面の説明において同一の要素には同一の符号を付し、重複する説明を省略する。
【００１２】
図１に本実施形態に係るガス計測装置の構成概略図を示す。
【００１３】
本実施形態に係るガス計測装置１は、エンジン２の排気系３を流れる排気ガスの流動を計測する装置である。図１に示すように、ガス計測装置１は、濃度検出器４を備えている。濃度検出器４は、エンジン２の排気系３を流れる排気ガスに含まれる炭化水素の濃度を検出するものである。
【００１４】
この濃度検出器４は、排気系３に設置されたプローブ５を通じて排気ガスに含まれる特定成分の濃度、即ち炭化水素の濃度を検出する。プローブ５は、排気系３に沿って所定の間隔で複数箇所に設けることが望ましい。このように複数設けることにより、排気系３を流れる排気ガスの流速の計測が可能となる。
【００１５】
濃度検出器４としては、炭化水素の濃度を検出できるものであれば、いずれの検出方式のものでもよいが、応答速度の速いものを用いることが好ましい。例えば、４ｍｓｅｃ．程度の応答速度で連続して計測できるものが好適である。
【００１６】
ガス計測装置１は、ＥＣＵ６を備えている。ＥＣＵ６は、ガス計測装置１の装置全体の制御を行うものであり、例えばＣＰＵ、ＲＯＭ、ＲＡＭを含むコンピュータを主体として構成されている。また、ＥＣＵ６は、エンジン２に設置されるインジェクタ７に噴射制御信号を出力し、燃料噴射量を制御する燃料噴射制御手段として機能する。
【００１７】
エンジン２は複数の気筒を有しており、各気筒に対し少なくとも一つのインジェクタ７を備えており、気筒ごとに燃料噴射量を調整できるようになっている。
【００１８】
ＥＣＵ６は、濃度検出器４と接続され、濃度検出器４に燃料噴射制御信号に同期する同期信号を出力可能となっている。濃度検出器４は、同期信号を受けることにより、インジェクタ７の燃料噴射タイミングを検知することができる。
【００１９】
図２に濃度検出位置の説明図を示す。
【００２０】
図２は排気系３を構成する管体３ａの断面をとって示したものである。排気系３の管体３ａには、プローブ５を挿通するための挿通孔３ｂが周方向に所定の間隔で複数形成されている。この挿通孔３ｂは、管体３ａの外側から差し込んだプローブ５が計測ポイントｘに配置できるように形成される。
【００２１】
計測ポイントｘは、管体３ａの断面を網羅するように複数設定するのが好ましい。例えば、図２に示すように、計測ポイントｘは、外側に８つ、内側に４つ設定される。
【００２２】
このように、排気系３のエキゾーストマニホルドの集合部や排気管の分岐部に多点計測できるようにプローブ５を配置可能とすることにより、排気系３の所定の断面において排気ガスの流動状態が計測可能となる。
【００２３】
次に、本実施形態に係るガス計測装置の動作及びガス計測方法について説明する。
【００２４】
まず、排気ガスの流速を計測する場合について説明する。
【００２５】
図１に示すように、エンジン２の排気系３の上流から下流にかけて複数の計測位置にそれぞれプローブ５を設置する。このとき、各計測位置においてプローブ５を一つ設置すればよい。
【００２６】
そして、エンジン２を駆動させる。このとき、エンジンの複数ある気筒のうち一部の気筒の燃料噴射量を他の気筒に対して増量して燃料噴射が行われる。例えば、複数ある気筒のうち一つの気筒の燃料噴射量が他の気筒に対して増量される。その際、燃料の増量噴射は、例えば一つの気筒について一サイクルだけ行う。この燃料増量により、燃料が不完全燃焼の状態となり、排気ガス中の炭化水素の濃度が増加する。
【００２７】
そして、各プローブ５の設置位置における炭化水素の濃度を濃度検出器４で検出する。ここで、炭化水素は、燃料噴射量の増量に伴って排気ガス中に増加する特定成分である。
【００２８】
そして、濃度検出器４にて検出された濃度に基づいて排気ガスの流速が演算される。この演算処理は、濃度検出器４で行ってもよいし、ＥＣＵ６に濃度検出信号を入力しＥＣＵ６で行ってもよい。
【００２９】
例えば、図１に示すように、排気系４の位置Ａ、Ｂ、Ｃで濃度検出を行う場合、各検出位置Ａ、Ｂ、Ｃにおける濃度の時間的変化を計測する。
【００３０】
そして、図３に示すように、炭化水素（ＨＣ）の濃度変化を計測したら、検出位置Ａ、Ｂ、Ｃにおける濃度増加時間ｔａ、ｔｂ、ｔｃをそれぞれ検出する。そして、検出位置における濃度増加時間の時間差と距離に基づいて排気ガスの流速を算出する。例えば、検出位置Ａ、Ｂにおける濃度増加時間の時間差をｔｂ−ｔａ、検出位置Ａ、Ｂ間の距離をｄ１とすると、Ａ−Ｂ間の排気ガスの流速がｄ１／（ｔｂ−ｔａ）を計算することにより算出できる。
【００３１】
次に、排気ガスの挙動状態を計測する場合について説明する。
【００３２】
図２に示すように、排気系３の管体３ａ内の計測ポイントｘにプローブ５を配置し、各計測ポイントｘの濃度変化を検出できるようにする。例えば、計測ポイントｘの全てにプローブ５を配置する。なお、後述するように計測ポイントｘの一部、例えば一つの計測ポイントｘにプローブ５を配置する場合もある。
【００３３】
そして、エンジン２を駆動させる。このとき、エンジンの複数ある気筒のうち一部の気筒の燃料噴射量を他の気筒に対して増量して燃料噴射が行われる。例えば、複数ある気筒のうち一つの気筒の燃料噴射量が他の気筒に対して増量される。この燃料増量により、燃料が不完全燃焼の状態となり、排気ガス中の炭化水素の濃度が増加する。
【００３４】
そして、各計測ポイントｘにおける炭化水素の濃度を濃度検出器４で検出する。ここで、炭化水素は、燃料噴射量の増量に伴って排気ガス中に増加する特定成分である。
【００３５】
そして、濃度検出器４にて検出された濃度に基づいて排気ガスの挙動が演算される。この演算処理は、濃度検出器４で行ってもよいし、ＥＣＵ６に濃度検出信号を入力しＥＣＵ６で行ってもよい。
【００３６】
例えば、図２の各計測ポイントｘにおける炭化水素の濃度変化を検出し、所定時間ごとの濃度分布を演算し画像として表す。図４に排気ガスの挙動を示した図を示す。本図は、クランク角３０度ごとに濃度分布を示したものである。図４中の暗い部分は濃度が濃く、明るい部分は濃度が薄い部分である。図４では、特定の気筒の排気ガスが下方の位置から右回りに回転して移動していることがわかる。
【００３７】
なお、この排気ガスの挙動計測において、計測ポイントｘの一つにのみプローブ５を配置して濃度検出を行う場合には、計測ポイントｘの一つについて濃度計測を行った後、プローブ５の配置位置を順次変えて、複数ある計測ポイントｘの全てについて濃度計測を行い、燃料噴射タイミングに基づいて時間軸を合わせて、各計測ポイントｘの濃度検出結果を合成すればよい。これにより、図４に示すような排気ガスの挙動を示す画像が得られる。
【００３８】
以上のように、本実施形態に係るガス計測装置及びガス計測方法によれば、エンジン２の一部の気筒の燃料噴射量を増量することにより、意図的に燃料を不完全燃焼させて排気ガス中の炭化水素の成分を増加させ、その成分濃度を検出することで排気ガスの流動状態を演算する。このため、燃料とは別個にトレーサガスを注入する必要がない。従って、簡易な設備で排気ガスの計測が精度良く行える。
【００３９】
また、エンジン２の一つの気筒の燃料噴射量を増量することにより、気筒ごとの排気ガスの流動状態を計測することができる。このため、Ｏ２センサに対する気筒ごとの排気ガスのガス当たりの状態などを正確に検出することができる。
【００４０】
なお、上述した実施形態では、複数ある気筒のうち一部の気筒の燃料噴射量を他の気筒に対し増量する場合について説明したが、本発明に係るガス計測方法及びガス計測装置はそのようなものに限定されるものではなく、一部の気筒の燃料噴射量を他の気筒に対し減量してガス計測を行ってもよい。この場合、エンジン２の排気系３にて排気ガスの特定成分として窒素酸化物（ＮＯｘ）の濃度を検出し、その成分濃度に基づいて排気ガスの流動状態を演算すればよい。このようなガス計測方法及びガス計測装置であっても、上述したガス計測方法及びガス計測装置と同様な作用効果が得られる。
【００４１】
【発明の効果】
以上説明したように本発明によれば、簡易に排気ガスの計測が行えるガス計測方法及びガス計測装置を提供することができる。
【図面の簡単な説明】
【図１】本発明の実施形態に係るガス計測装置の構成概略図である。
【図２】本発明の実施形態に係るガス計測装置及びガス計測方法におけるプローブの配置の説明図である。
【図３】本発明の実施形態に係るガス計測装置及びガス計測方法における排気ガスの流動計測の説明図である。
【図４】本発明の実施形態に係るガス計測装置及びガス計測方法における排気ガスの挙動計測の説明図である。
【符号の説明】
１…ガス計測装置、２…エンジン（内燃機関）、３…排気系、４…濃度検出器、５…プローブ、６…ＥＣＵ、７…インジェクタ。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas measuring method and a gas measuring device for measuring a flow state of exhaust gas of an internal combustion engine.
[0002]
[Prior art]
Conventionally, as a gas measuring device for an internal combustion engine, as described in JP-A-2001-124673, sulfur hexafluoride is injected as a tracer gas into an exhaust pipe of the engine and exhausted downstream of the injection position in the exhaust pipe. One that continuously analyzes the concentration of each component of the gas simultaneously with the concentration of the tracer gas is known. This apparatus detects the concentration of the tracer gas and attempts to detect the exhaust weight of the exhaust gas based on the concentration of the tracer gas.
[0003]
[Patent Document 1]
[Patent Document 1] Japanese Patent Application Laid-Open No. 2001-124673
[Problems to be solved by the invention]
However, in such a gas measuring device, it is necessary to inject the tracer gas from the middle of the exhaust pipe, and the equipment necessary for gas measurement becomes large. For this reason, there is an urgent need for technological development that enables measurement of exhaust gas with simpler equipment.
[0005]
Therefore, the present invention has been made in view of such a technical problem, and an object thereof is to provide a gas measuring method and a gas measuring device capable of easily measuring exhaust gas.
[0006]
[Means for Solving the Problems]
That is, the gas measurement method according to the present invention is a gas measurement method for measuring exhaust gas of an internal combustion engine, and increases the fuel injection amount of some cylinders among a plurality of cylinders of the internal combustion engine relative to other cylinders. A fuel injection process for performing fuel injection at a reduced amount, a concentration detection process for detecting a concentration of a specific component in the exhaust gas that increases as the fuel injection amount increases or decreases at a plurality of measurement points of the exhaust system of the internal combustion engine, and a specific And a calculation step for calculating the flow state of the exhaust gas based on the concentration change of the component .
[0007]
In the gas measurement method according to the present invention, in the fuel injection process described above, the fuel injection is performed by increasing the fuel injection amount of some of the cylinders of the internal combustion engine to the other cylinders, and the concentration detection described above. In the process, the concentration of hydrocarbons contained in the exhaust gas is detected, and in the aforementioned calculation process, the flow state of the exhaust gas is calculated based on the change in the concentration of hydrocarbons.
[0008]
The gas measuring device according to the present invention is a gas measuring device that measures exhaust gas of an internal combustion engine, and increases or decreases the fuel injection amount of some of the cylinders of the internal combustion engine relative to other cylinders. Fuel injection control means for performing fuel injection, concentration detection means for detecting the concentration of a specific component in exhaust gas that increases as the fuel injection amount increases or decreases at a plurality of measurement points of the exhaust system of the internal combustion engine , And a calculation means for calculating the flow state of the exhaust gas based on the concentration change .
[0009]
Further, in the gas measuring device according to the present invention, the above-described fuel injection means performs fuel injection by increasing the fuel injection amount of some cylinders of the plurality of cylinders of the internal combustion engine to the other cylinders, and detects the concentration described above. The means detects the concentration of hydrocarbons contained in the exhaust gas, and the calculating means described above calculates the flow state of the exhaust gas based on the change in the hydrocarbon concentration .
[0010]
According to these inventions, by increasing or decreasing the fuel injection amount of some cylinders, the fuel is intentionally incompletely burned to increase specific components such as hydrocarbons in the exhaust gas. The flow state of the exhaust gas is calculated by detecting the concentration. For this reason, it is not necessary to inject the tracer gas separately from the fuel. Therefore, exhaust gas can be measured with simple equipment.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.
[0012]
FIG. 1 shows a schematic configuration diagram of a gas measuring apparatus according to the present embodiment.
[0013]
The gas measuring device 1 according to the present embodiment is a device that measures the flow of exhaust gas flowing through the exhaust system 3 of the engine 2. As shown in FIG. 1, the gas measuring device 1 includes a concentration detector 4. The concentration detector 4 detects the concentration of hydrocarbons contained in the exhaust gas flowing through the exhaust system 3 of the engine 2.
[0014]
The concentration detector 4 detects the concentration of a specific component contained in the exhaust gas, that is, the concentration of hydrocarbons, through a probe 5 installed in the exhaust system 3. The probes 5 are preferably provided at a plurality of locations along the exhaust system 3 at predetermined intervals. By providing a plurality of the exhaust gases in this way, the flow velocity of the exhaust gas flowing through the exhaust system 3 can be measured.
[0015]
As the concentration detector 4, any detection system may be used as long as it can detect the concentration of hydrocarbons, but it is preferable to use one having a high response speed. For example, 4 msec. What can measure continuously with the response speed of a grade is suitable.
[0016]
The gas measuring device 1 includes an ECU 6. The ECU 6 controls the entire apparatus of the gas measuring device 1 and is configured mainly by a computer including a CPU, a ROM, and a RAM, for example. The ECU 6 also functions as fuel injection control means for outputting an injection control signal to an injector 7 installed in the engine 2 to control the fuel injection amount.
[0017]
The engine 2 has a plurality of cylinders, and includes at least one injector 7 for each cylinder so that the fuel injection amount can be adjusted for each cylinder.
[0018]
The ECU 6 is connected to the concentration detector 4 and can output a synchronization signal synchronized with the fuel injection control signal to the concentration detector 4. The concentration detector 4 can detect the fuel injection timing of the injector 7 by receiving the synchronization signal.
[0019]
FIG. 2 is an explanatory diagram of the density detection position.
[0020]
FIG. 2 shows a cross section of a tube body 3 a constituting the exhaust system 3. A plurality of insertion holes 3b through which the probe 5 is inserted are formed in the tubular body 3a of the exhaust system 3 at predetermined intervals in the circumferential direction. The insertion hole 3b is formed so that the probe 5 inserted from the outside of the tube 3a can be placed at the measurement point x.
[0021]
It is preferable to set a plurality of measurement points x so as to cover the cross section of the tubular body 3a. For example, as shown in FIG. 2, eight measurement points x are set on the outside and four on the inside.
[0022]
In this way, by allowing the probe 5 to be arranged so that multipoint measurement can be performed at the exhaust manifold 3 exhaust manifold assembly and the exhaust pipe branching portion, the flow state of the exhaust gas in a predetermined cross section of the exhaust system 3 can be improved. It becomes possible to measure.
[0023]
Next, the operation of the gas measuring device and the gas measuring method according to this embodiment will be described.
[0024]
First, the case where the flow rate of exhaust gas is measured will be described.
[0025]
As shown in FIG. 1, probes 5 are respectively installed at a plurality of measurement positions from upstream to downstream of the exhaust system 3 of the engine 2. At this time, one probe 5 may be installed at each measurement position.
[0026]
Then, the engine 2 is driven. At this time, fuel injection is performed by increasing the fuel injection amount of some of the cylinders of the engine to other cylinders. For example, the fuel injection amount of one cylinder among a plurality of cylinders is increased with respect to the other cylinders. At that time, the fuel injection is performed only for one cycle per cylinder, for example. This fuel increase causes the fuel to be incompletely burned and increases the concentration of hydrocarbons in the exhaust gas.
[0027]
Then, the concentration detector 4 detects the hydrocarbon concentration at the installation position of each probe 5. Here, the hydrocarbon is a specific component that increases in the exhaust gas as the fuel injection amount increases.
[0028]
Then, the flow rate of the exhaust gas is calculated based on the concentration detected by the concentration detector 4. This calculation process may be performed by the concentration detector 4 or may be performed by the ECU 6 by inputting a concentration detection signal to the ECU 6.
[0029]
For example, as shown in FIG. 1, when concentration detection is performed at positions A, B, and C of the exhaust system 4, the temporal change in concentration at each detection position A, B, and C is measured.
[0030]
As shown in FIG. 3, when the change in hydrocarbon (HC) concentration is measured, the concentration increase times ta, tb, and tc at the detection positions A, B, and C are detected. Then, the flow rate of the exhaust gas is calculated based on the time difference and distance of the concentration increase time at the detection position. For example, assuming that the time difference between the concentration increase times at the detection positions A and B is tb-ta and the distance between the detection positions A and B is d1, the exhaust gas flow velocity between A and B is calculated as d1 / (tb-ta). This can be calculated.
[0031]
Next, the case where the behavior state of exhaust gas is measured will be described.
[0032]
As shown in FIG. 2, a probe 5 is arranged at a measurement point x in the tube 3a of the exhaust system 3 so that a change in concentration at each measurement point x can be detected. For example, the probes 5 are arranged at all the measurement points x. As will be described later, the probe 5 may be arranged at a part of the measurement point x, for example, at one measurement point x.
[0033]
Then, the engine 2 is driven. At this time, fuel injection is performed by increasing the fuel injection amount of some of the cylinders of the engine to other cylinders. For example, the fuel injection amount of one cylinder among a plurality of cylinders is increased with respect to the other cylinders. This fuel increase causes the fuel to be incompletely burned and increases the concentration of hydrocarbons in the exhaust gas.
[0034]
Then, the concentration detector 4 detects the hydrocarbon concentration at each measurement point x. Here, the hydrocarbon is a specific component that increases in the exhaust gas as the fuel injection amount increases.
[0035]
Then, the behavior of the exhaust gas is calculated based on the concentration detected by the concentration detector 4. This calculation process may be performed by the concentration detector 4 or may be performed by the ECU 6 by inputting a concentration detection signal to the ECU 6.
[0036]
For example, a change in the hydrocarbon concentration at each measurement point x in FIG. 2 is detected, and the concentration distribution for each predetermined time is calculated and represented as an image. FIG. 4 shows the behavior of the exhaust gas. This figure shows the density distribution for every 30 degrees of crank angle. The dark part in FIG. 4 has a high density, and the bright part has a low density. In FIG. 4, it can be seen that the exhaust gas of a specific cylinder is moving clockwise from a lower position.
[0037]
In this exhaust gas behavior measurement, when the probe 5 is arranged at only one of the measurement points x and concentration detection is performed, the concentration measurement is performed for one of the measurement points x and then the probe 5 is arranged. It is only necessary to sequentially change the position, measure the concentration at all of the plurality of measurement points x, match the time axis based on the fuel injection timing, and synthesize the concentration detection results at each measurement point x. Thereby, an image showing the behavior of the exhaust gas as shown in FIG. 4 is obtained.
[0038]
As described above, according to the gas measuring device and the gas measuring method according to the present embodiment, the exhaust gas is intentionally burnt incompletely by increasing the fuel injection amount of some cylinders of the engine 2. The flow state of the exhaust gas is calculated by increasing the components of hydrocarbons therein and detecting the concentration of the components. For this reason, it is not necessary to inject the tracer gas separately from the fuel. Therefore, exhaust gas can be accurately measured with simple equipment.
[0039]
Further, by increasing the fuel injection amount of one cylinder of the engine 2, the flow state of the exhaust gas for each cylinder can be measured. For this reason, the state per gas of the exhaust gas for each cylinder with respect to the O2 sensor can be accurately detected.
[0040]
In the above-described embodiment, the case where the fuel injection amount of some of the cylinders is increased with respect to the other cylinders has been described. However, the gas measurement method and the gas measurement device according to the present invention are such The gas measurement may be performed by reducing the fuel injection amount of some cylinders relative to other cylinders. In this case, the exhaust system 3 of the engine 2 may detect the concentration of nitrogen oxide (NOx) as a specific component of the exhaust gas, and calculate the flow state of the exhaust gas based on the component concentration. Even with such a gas measurement method and gas measurement device, the same effects as those of the gas measurement method and gas measurement device described above can be obtained.
[0041]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a gas measuring method and a gas measuring device that can easily measure exhaust gas.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a gas measurement device according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram of the arrangement of probes in a gas measuring device and a gas measuring method according to an embodiment of the present invention.
FIG. 3 is an explanatory diagram of exhaust gas flow measurement in the gas measurement device and the gas measurement method according to the embodiment of the present invention.
FIG. 4 is an explanatory diagram of exhaust gas behavior measurement in the gas measurement device and the gas measurement method according to the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Gas measuring device, 2 ... Engine (internal combustion engine), 3 ... Exhaust system, 4 ... Concentration detector, 5 ... Probe, 6 ... ECU, 7 ... Injector.

Claims (4)

内燃機関の排気ガスを計測するガス計測方法であって、
前記内燃機関の複数ある気筒のうち一部の気筒の燃料噴射量を他の気筒に対し増量又は減量して燃料噴射を行う燃料噴射工程と、
前記内燃機関の排気系の複数の計測ポイントにおいて、前記燃料噴射量の増減に伴って増加する前記排気ガス中の特定成分の濃度を検出する濃度検出工程と、
前記特定成分の濃度変化に基づいて前記排気ガスの流動状態を演算する演算工程と、
を備えたことを特徴とするガス計測方法。A gas measurement method for measuring exhaust gas of an internal combustion engine,
A fuel injection step of performing fuel injection by increasing or decreasing the fuel injection amount of some of the plurality of cylinders of the internal combustion engine relative to other cylinders;
A concentration detection step of detecting a concentration of a specific component in the exhaust gas that increases as the fuel injection amount increases or decreases at a plurality of measurement points of the exhaust system of the internal combustion engine;
A calculation step of calculating a flow state of the exhaust gas based on a concentration change of the specific component ;
A gas measuring method comprising: 前記燃料噴射工程では、前記内燃機関の複数ある気筒のうち一部の気筒の燃料噴射量を他の気筒に対し増量して燃料噴射を行い、
前記濃度検出工程では、前記排気ガスに含まれる炭化水素の濃度を検出し、
前記演算工程では、前記炭化水素の濃度変化に基づいて前記排気ガスの流動状態を演算すること、
を特徴とする請求項１に記載のガス計測方法。In the fuel injection step, fuel injection is performed by increasing the fuel injection amount of some of the plurality of cylinders of the internal combustion engine relative to other cylinders,
In the concentration detection step, the concentration of hydrocarbons contained in the exhaust gas is detected,
In the calculation step, calculating a flow state of the exhaust gas based on a change in the concentration of the hydrocarbon,
The gas measurement method according to claim 1, wherein: 内燃機関の排気ガスを計測するガス計測装置において、
前記内燃機関の複数ある気筒のうち一部の気筒の燃料噴射量を他の気筒に対し増量又は減量して燃料噴射を行う燃料噴射制御手段と、
前記内燃機関の排気系の複数の計測ポイントにおいて、前記燃料噴射量の増減に伴って増加する前記排気ガス中の特定成分の濃度を検出する濃度検出手段と、
前記特定成分の濃度変化に基づいて前記排気ガスの流動状態を演算する演算手段と、
を備えたことを特徴とするガス計測装置。In a gas measuring device for measuring exhaust gas of an internal combustion engine,
Fuel injection control means for performing fuel injection by increasing or decreasing the fuel injection amount of some of the plurality of cylinders of the internal combustion engine relative to other cylinders;
Concentration detecting means for detecting the concentration of a specific component in the exhaust gas that increases with an increase or decrease in the fuel injection amount at a plurality of measurement points of the exhaust system of the internal combustion engine;
A calculation means for calculating a flow state of the exhaust gas based on a concentration change of the specific component ;
A gas measuring device comprising: 前記燃料噴射手段は、前記内燃機関の複数ある気筒のうち一部の気筒の燃料噴射量を他の気筒に対し増量して燃料噴射を行い、
前記濃度検出手段は、前記排気ガスに含まれる炭化水素の濃度を検出し、
前記演算手段は、前記炭化水素の濃度変化に基づいて前記排気ガスの流動状態を演算すること、
を特徴とする請求項３に記載のガス計測装置。The fuel injection means performs fuel injection by increasing the fuel injection amount of some of the cylinders of the internal combustion engine to other cylinders,
The concentration detection means detects the concentration of hydrocarbons contained in the exhaust gas,
The calculating means calculates a flow state of the exhaust gas based on a change in the concentration of the hydrocarbon;
The gas measuring device according to claim 3.
JP2003139459A 2003-05-16 2003-05-16 Gas measuring method and gas measuring device Expired - Fee Related JP4222101B2 (en)

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