JP2017110556A - Exhaust emission control device - Google Patents

Exhaust emission control device Download PDF

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JP2017110556A
JP2017110556A JP2015245458A JP2015245458A JP2017110556A JP 2017110556 A JP2017110556 A JP 2017110556A JP 2015245458 A JP2015245458 A JP 2015245458A JP 2015245458 A JP2015245458 A JP 2015245458A JP 2017110556 A JP2017110556 A JP 2017110556A
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injector
exhaust gas
exhaust
exhaust passage
control device
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隆行 木内
Takayuki Kiuchi
隆行 木内
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Isuzu Motors Ltd
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Isuzu Motors Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an exhaust emission control device that can prevent soot from depositing in an injection port of an injector without a decline in cleaning rate of an exhaust gas.SOLUTION: The exhaust emission control device includes: the injector 4 inserted into an exhaust passage 2 of a diesel engine 1 having a plurality of bent parts 5a to 5d; and a PM collection filter 7 interposed into the exhaust passage 2 positioned downstream of the injector 4, where the injector 4 is inserted from an inner side of the bent part 5a coming closest to the diesel engine 1.SELECTED DRAWING: Figure 1

Description

本発明は排ガス浄化装置に関し、更に詳しくは、排ガスの浄化率を低下させることなく、インジェクターの噴口部への煤の堆積を防止することができる排ガス浄化装置に関する。   The present invention relates to an exhaust gas purification device, and more particularly, to an exhaust gas purification device that can prevent soot from accumulating in an injection nozzle portion without reducing the purification rate of exhaust gas.

ディーゼルエンジンを駆動源とする車両には、排ガスに含まれる粒子状物質（ＰＭ）や窒素酸化物（ＮＯｘ）などの有害物質を除去するための排ガス浄化装置が搭載されている。   A vehicle using a diesel engine as a drive source is equipped with an exhaust gas purification device for removing harmful substances such as particulate matter (PM) and nitrogen oxide (NOx) contained in the exhaust gas.

前者のＰＭについては、セラミックス製のハニカム状多孔体のフィルターによりＰＭを捕集して浄化するＰＭ捕集フィルターが主に用いられている（例えば、特許文献１を参照）。このＰＭ捕集フィルターは、捕集されたＰＭによる目詰まりを防ぐために、捕集限界量に達する前にＰＭを燃焼させて除去する必要がある。排ガスの温度が５００℃以上などの高温であるときには、ＰＭは連続的に自然燃焼する。しかし、排ガスの温度が低温のときには、排ガス中に未燃燃料を供給して、未燃燃料の炭化水素（ＨＣ）をフィルターの前段に配置された酸化触媒（ＤＯＣ）で燃焼させ、その酸化反応熱を利用してＤＯＣを６００℃程度に加熱することで排ガスを昇温して、捕集されたＰＭを強制的に燃焼させる強制再生が必要となる。   As for the former PM, a PM collection filter that collects and purifies PM by a filter made of a honeycomb-like porous body made of ceramics is mainly used (for example, see Patent Document 1). In order to prevent clogging by the collected PM, the PM collection filter needs to burn and remove PM before reaching the collection limit amount. When the temperature of the exhaust gas is a high temperature such as 500 ° C. or higher, PM spontaneously burns continuously. However, when the temperature of the exhaust gas is low, unburned fuel is supplied into the exhaust gas, and the hydrocarbon (HC) of the unburned fuel is burned by the oxidation catalyst (DOC) arranged in the front stage of the filter, and the oxidation reaction The forced regeneration which heats exhaust gas by heating DOC to about 600 degreeC using heat and forcibly burns the collected PM is required.

通常、排ガス中への未燃燃料の供給は、排気通路に挿入されたインジェクターにより行われる。このインジェクターは、先端の噴口部から未燃燃料を噴霧するものであるが、排ガス中に含まれる煤が噴口部に堆積して噴霧異常に至るおそれがある。   Usually, unburned fuel is supplied into the exhaust gas by an injector inserted in the exhaust passage. This injector sprays unburned fuel from the tip part of the nozzle, but there is a possibility that soot contained in the exhaust gas accumulates on the nozzle part and causes a spray abnormality.

特開２００５−１６３１７号公報JP 2005-16317 A

本発明の目的は、排ガスの浄化率を低下させることなく、インジェクターの噴口部への煤の堆積を防止することができる排ガス浄化装置を提供することにある。   An object of the present invention is to provide an exhaust gas purifying device capable of preventing soot from accumulating in an injection nozzle portion without reducing the exhaust gas purification rate.

上記の目的を達成する本発明の排ガス浄化装置は、複数の湾曲部を有するエンジンの排気通路に挿入されたインジェクターと、前記インジェクターの下流側の前記排気通路に介設されたＰＭ捕集フィルターと、を備えた排ガス浄化装置において、前記インジェクターを、前記複数の湾曲部のうちの前記エンジンに最も近接する湾曲部の内側から挿入してなる構成を有することを特徴とするものである。   An exhaust gas purifying apparatus of the present invention that achieves the above object includes an injector inserted into an exhaust passage of an engine having a plurality of curved portions, a PM collection filter interposed in the exhaust passage downstream of the injector, The exhaust gas purifying apparatus having the above-described configuration is characterized in that the injector is inserted from the inside of the curved portion closest to the engine among the plurality of curved portions.

本発明の排ガス浄化装置によれば、インジェクターをエンジンに最も近接している湾曲部の内側から挿入するようにしたので、排気通路の湾曲部の内側に発生する排ガスの渦によって煤の滞在が抑制されるので、インジェクターの噴口部への煤の堆積を防止することができる。また、高温の排ガス中に未燃燃料が噴霧されるので、未燃燃料が液滴化することなく排ガスと十分に混合してＰＭ捕集フィルターの再生に供されるため、排ガスの浄化率が低下することはない。   According to the exhaust gas purification apparatus of the present invention, since the injector is inserted from the inside of the curved portion closest to the engine, the stay of soot is suppressed by the exhaust gas vortex generated inside the curved portion of the exhaust passage. As a result, accumulation of soot at the injection hole of the injector can be prevented. Moreover, since the unburned fuel is sprayed in the high-temperature exhaust gas, the unburned fuel is sufficiently mixed with the exhaust gas without forming droplets and used for regeneration of the PM collection filter. There is no decline.

本発明の実施形態からなる排ガス浄化装置の構成図である。It is a block diagram of the exhaust gas purification apparatus which consists of embodiment of this invention.

以下に、本発明の実施の形態について、図面を参照して説明する。図１は、本発明の第１の実施形態からなる排ガス浄化装置の構成を示す。   Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of an exhaust gas purifying apparatus according to the first embodiment of the present invention.

この排ガス浄化装置は、車両に搭載されたディーゼルエンジン１からの排ガスＧが流れる排気通路２に介設された太径の触媒コンバーター３と、その触媒コンバーター３の上流側の排気通路２に挿入されたインジェクター４とを備えている。   This exhaust gas purification device is inserted into a large-diameter catalytic converter 3 interposed in an exhaust passage 2 through which exhaust gas G from a diesel engine 1 mounted on a vehicle flows, and an exhaust passage 2 upstream of the catalytic converter 3. The injector 4 is provided.

排気通路２には、車両のレイアウトに応じた複数（この例では４個）の湾曲部５ａ〜５ｄが、ディーゼルエンジン１から順に形成されている。   In the exhaust passage 2, a plurality (four in this example) of curved portions 5 a to 5 d corresponding to the layout of the vehicle are formed in order from the diesel engine 1.

触媒コンバーター３内には、前段に酸化触媒（ＤＯＣ）６が配置されたＰＭ捕集フィルター７が格納されている。ＤＯＣ６は、ディーゼルエンジン１の排ガスＧの混合機能を有する構造に成形した金属製の担持体に、ロジウム、酸化セリウム、白金、酸化アルミニウム等を担持して形成される。また、ＰＭ捕集フィルター７は、多孔質セラミック製のハニカムのチャンネル（セル）の入口と出口を交互に目封じしたモノリスハニカム型のウオールフロータイプのフィルターから形成される。なお、図１の構成例では、ＤＯＣとＰＭ捕集フィルターとを別体としているが、フィルターに酸化触媒物質を担持させたＣＳＦとして一体で用いるようにしても良い。   In the catalytic converter 3, a PM collection filter 7 in which an oxidation catalyst (DOC) 6 is disposed in the previous stage is stored. The DOC 6 is formed by supporting rhodium, cerium oxide, platinum, aluminum oxide or the like on a metal carrier formed into a structure having a function of mixing the exhaust gas G of the diesel engine 1. The PM collection filter 7 is formed of a monolith honeycomb wall flow type filter in which the inlet and outlet of a porous ceramic honeycomb channel (cell) are alternately plugged. In the configuration example of FIG. 1, the DOC and the PM collection filter are separated from each other. However, the DOC and the PM collection filter may be integrally used as a CSF in which an oxidation catalyst substance is supported on the filter.

インジェクター４は、燃料タンク（図示せず）から圧送された未燃燃料を、排気通路２内に位置する先端の噴口部８から噴霧する機能を有している。このインジェクター４は、未燃燃料と排ガスＧとが十分に混合するように、排気通路２の下流側に向けて傾斜して挿入されている。   The injector 4 has a function of spraying unburned fuel pumped from a fuel tank (not shown) from the nozzle portion 8 at the tip located in the exhaust passage 2. The injector 4 is inserted inclined toward the downstream side of the exhaust passage 2 so that the unburned fuel and the exhaust gas G are sufficiently mixed.

このような排ガス浄化装置において、インジェクター４は、４個の湾曲部５ａ〜５ｄのうちで、ディーゼルエンジン１に最も近接している湾曲部５ａの内側から排気通路２へ挿入されている。   In such an exhaust gas purification device, the injector 4 is inserted into the exhaust passage 2 from the inside of the curved portion 5a closest to the diesel engine 1 among the four curved portions 5a to 5d.

このように構成することで、排気通路２の湾曲部５ａの内側に発生する排ガスＧの渦によって煤の滞在が抑制されるので、インジェクター４の噴口部８への煤の堆積を防止することができるのである。また、ディーゼルエンジン１から排出された直後の高温の排ガスＧ中に未燃燃料が噴霧されるので、未燃燃料が液滴化することなく排ガスＧと十分に混合してＰＭ捕集フィルター７の再生に供されるため、排ガスＧの浄化率が低下することはない。   With this configuration, the stay of soot is suppressed by the vortex of the exhaust gas G generated inside the curved portion 5a of the exhaust passage 2, so that soot can be prevented from accumulating at the nozzle portion 8 of the injector 4. It can be done. Further, since the unburned fuel is sprayed in the high-temperature exhaust gas G immediately after being discharged from the diesel engine 1, the unburned fuel is sufficiently mixed with the exhaust gas G without forming droplets, and the PM collection filter 7 Since it is used for regeneration, the purification rate of the exhaust gas G does not decrease.

１ ディーゼルエンジン
２ 排気通路
３ 触媒コンバーター
４ インジェクター
５ａ〜５ｄ 湾曲部
６ ＤＯＣ
７ ＰＭ捕集フィルター
８ 噴口部 DESCRIPTION OF SYMBOLS 1 Diesel engine 2 Exhaust passage 3 Catalytic converter 4 Injector 5a-5d Curved part 6 DOC
7 PM collection filter 8 Port

Claims (2)

複数の湾曲部を有するエンジンの排気通路に挿入されたインジェクターと、前記インジェクターの下流側の前記排気通路に介設されたＰＭ捕集フィルターと、を備えた排ガス浄化装置において、
前記インジェクターを、前記複数の湾曲部のうちの前記エンジンに最も近接する湾曲部の内側から挿入してなる構成を有することを特徴とする排ガス浄化装置。 In an exhaust gas purification apparatus comprising: an injector inserted into an exhaust passage of an engine having a plurality of curved portions; and a PM collection filter interposed in the exhaust passage on the downstream side of the injector;
An exhaust gas purifier having a configuration in which the injector is inserted from the inside of a curved portion closest to the engine among the plurality of curved portions. 前記インジェクターを前記排気通路の下流側に向けて傾斜させて挿入してなる構成を有する請求項１に記載の排ガス浄化装置。   The exhaust gas purifying apparatus according to claim 1, wherein the injector is configured to be inclined and inserted toward the downstream side of the exhaust passage.
JP2015245458A 2015-12-16 2015-12-16 Exhaust emission control device Pending JP2017110556A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020056393A (en) * 2018-10-03 2020-04-09 株式会社三五 Exhaust purification device

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Publication number Priority date Publication date Assignee Title
JPH10141113A (en) * 1996-11-05 1998-05-26 Toyota Motor Corp Intake pipe structure for internal combustion engine
JP2000204940A (en) * 1999-01-12 2000-07-25 Toyota Motor Corp Exhaust gas control device for internal combustion engine
JP2010203248A (en) * 2009-02-27 2010-09-16 Toyota Motor Corp Exhaust pipe structure of internal combustion engine
KR20110062617A (en) * 2009-12-03 2011-06-10 현대자동차주식회사 System for controlling secondary injection of automobile and method thereof
WO2012011148A1 (en) * 2010-07-21 2012-01-26 トヨタ自動車株式会社 Exhaust gas purification device for internal combustion engine
JP2012107523A (en) * 2010-11-15 2012-06-07 Toyota Motor Corp Exhaust purification control device
JP2013096246A (en) * 2011-10-28 2013-05-20 Isuzu Motors Ltd Exhaust emission control device of internal combustion engine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10141113A (en) * 1996-11-05 1998-05-26 Toyota Motor Corp Intake pipe structure for internal combustion engine
JP2000204940A (en) * 1999-01-12 2000-07-25 Toyota Motor Corp Exhaust gas control device for internal combustion engine
JP2010203248A (en) * 2009-02-27 2010-09-16 Toyota Motor Corp Exhaust pipe structure of internal combustion engine
KR20110062617A (en) * 2009-12-03 2011-06-10 현대자동차주식회사 System for controlling secondary injection of automobile and method thereof
WO2012011148A1 (en) * 2010-07-21 2012-01-26 トヨタ自動車株式会社 Exhaust gas purification device for internal combustion engine
JP2012107523A (en) * 2010-11-15 2012-06-07 Toyota Motor Corp Exhaust purification control device
JP2013096246A (en) * 2011-10-28 2013-05-20 Isuzu Motors Ltd Exhaust emission control device of internal combustion engine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020056393A (en) * 2018-10-03 2020-04-09 株式会社三五 Exhaust purification device
JP7232631B2 (en) 2018-10-03 2023-03-03 株式会社三五 Exhaust purification device

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