JP2501542Y2 - Exhaust gas purification system for diesel engines - Google Patents
Exhaust gas purification system for diesel enginesInfo
- Publication number
- JP2501542Y2 JP2501542Y2 JP1989129145U JP12914589U JP2501542Y2 JP 2501542 Y2 JP2501542 Y2 JP 2501542Y2 JP 1989129145 U JP1989129145 U JP 1989129145U JP 12914589 U JP12914589 U JP 12914589U JP 2501542 Y2 JP2501542 Y2 JP 2501542Y2
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- fuel
- exhaust
- exhaust gas
- lean
- 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.)
- Expired - Lifetime
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- Combustion Methods Of Internal-Combustion Engines (AREA)
- Exhaust Gas After Treatment (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案は、排気系に、貴金属もしくは遷移金属を担持
せしめたゼオライト系触媒を備えた希薄燃焼を行う筒内
噴射式内燃機関の排気浄化装置に関する。[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an exhaust gas purification apparatus for a cylinder injection type internal combustion engine that performs lean combustion, in which an exhaust system is provided with a zeolite catalyst supporting a noble metal or a transition metal. Regarding
希薄空燃比領域でNOx浄化能力をもつ、ゼオライト系
担体上に貴金属もしくは遷移金属を担持せしめた触媒
（以下、リーンNOx触媒という）は知られている（たと
えば、特開昭63-283727号公報）。A catalyst (hereinafter referred to as a lean NOx catalyst) in which a precious metal or a transition metal is supported on a zeolite-based carrier, which has an NOx purification capacity in a lean air-fuel ratio region, is known (for example, JP-A-63-283727). .
一方、ディーゼル機関に代表される希薄燃焼を行う筒
内噴射機関は、ストイキ（理論空燃比、A/F13〜14）よ
りもはるかにリーン域（A/F22〜24）にて燃焼される。
リーン域燃焼によって燃費は向上されるものの、リーン
域では三元触媒によるNOx浄化能力がほとんど無いた
め、従来の三元触媒による排気浄化を用いることができ
ず、NOx浄化が問題となる。リーンNOx触媒はリーン域で
NOx浄化能力をもつため、リーンNOx触媒をこのような機
関の排気系に設けることが、NOx低減上有効である。On the other hand, the in-cylinder injection engine that performs lean combustion represented by a diesel engine is burned in a lean range (A / F22 to 24) far more than stoichiometric (theoretical air-fuel ratio, A / F13 to 14).
Although fuel consumption is improved by lean combustion, in the lean region, there is almost no NOx purification capacity with a three-way catalyst, so conventional exhaust gas purification with a three-way catalyst cannot be used, and NOx purification becomes a problem. Lean NOx catalyst is lean
Since it has a NOx purification capability, it is effective to reduce the NOx by providing a lean NOx catalyst in the exhaust system of such an engine.
（考案が解決しようとする課題） しかし、考案者等の試験研究によれば、リーンNOx触
媒によるNOx浄化作用を促進させるには、次の条件が必
要である。(Problems to be solved by the device) However, according to the test studies of the inventor and the like, the following conditions are necessary to promote the NOx purification action by the lean NOx catalyst.
（イ）排気ガス中のHC（末燃炭化水素）の濃度が高いこ
と。希薄燃焼を行う筒内噴射式内燃機関の排気ガスは、
リーン域燃焼のため酸素過剰雰囲気にあり、燃料のHCは
ほとんど酸化されて、HC不足状態にあるが、リーンNOx
触媒によるNOx浄化が効果的に得られるには、排気ガス
中になおHCが必要濃度で残留していなければならない。(B) The concentration of HC (end-burning hydrocarbon) in the exhaust gas is high. The exhaust gas of a cylinder injection type internal combustion engine that performs lean combustion is
Due to lean combustion, it is in an atmosphere with excess oxygen, and most of the fuel HC is oxidized, and it is in a state of HC shortage, but lean NOx
For effective NOx purification by catalyst, HC must still remain in the exhaust gas at the required concentration.
（ロ）残留HCが、その分子の炭素数が少ないものである
こと。たとえば、ディーゼル機関の燃料は軽油であるか
ら機関での燃焼を経て残留した排気ガス中の残留HCは比
較的高級分子（炭素数が多い分子）であるが、リーンNO
x触媒によるNOx低減が有効に働くには、低級（分子数の
少ない）HC分子であることが望ましい。(B) The residual HC has a small number of carbon atoms in its molecule. For example, the diesel engine fuel is light oil, so the residual HC in the exhaust gas that remains after combustion in the engine is a relatively high molecular weight molecule (a molecule with a large number of carbon atoms).
In order for NOx reduction by the x catalyst to work effectively, it is desirable that it is a low-grade (small number of molecules) HC molecule.
本考案は、排気系にリーンNOx触媒を備えた希薄燃焼
を行う筒内噴射式内燃機関の排気浄化装置において、リ
ーンNOx触媒に流れる排気ガス中のHC濃度を高め、しか
も該HCを低級分子状態でリーンNOx触媒に供給できるよ
うにすることを目的とする。The present invention, in an exhaust gas purification device for a direct injection internal combustion engine that performs lean combustion with a lean NOx catalyst in the exhaust system, increases the HC concentration in the exhaust gas flowing to the lean NOx catalyst and further reduces the HC to a low molecular state. The purpose is to be able to supply to the lean NOx catalyst at.
上記目的は、本考案によれば、次の内燃機関の排気浄
化装置によって、達成される。すなわち、吸気或いは圧
縮行程で筒内に燃料を噴射する燃料噴射手段を有し希薄
空燃比領域で運転される筒内噴射式内燃機関と、その排
気通路に設けられた酸素過剰の排気中でNOxを還元、浄
化するリーンNOx触媒と、からなる内燃機関の排気浄化
装置において、前記吸気或いは圧縮行程で燃料を噴射す
る燃料噴射手段が膨張或いは排気行程にある気筒内に燃
料の一部を噴射する手段として用いられ、前記気筒が膨
張或いは排気行程で筒内に噴射された燃料を筒内の熱で
分解して低級HCとする改質装置として用いられることを
特徴とする内燃機関の排気浄化装置。According to the present invention, the above object is achieved by the following exhaust gas purification apparatus for an internal combustion engine. That is, an in-cylinder injection internal combustion engine that has fuel injection means for injecting fuel into the cylinder during the intake or compression stroke and that is operated in a lean air-fuel ratio region, and NOx in exhaust gas with excess oxygen provided in its exhaust passage In a device for purifying exhaust gas of an internal combustion engine, which comprises a lean NOx catalyst for reducing and purifying fuel, fuel injection means for injecting fuel in the intake or compression stroke injects part of the fuel into the cylinder in the expansion or exhaust stroke. An exhaust gas purification device for an internal combustion engine, characterized in that the cylinder is used as a reformer for decomposing fuel injected into a cylinder in expansion or exhaust stroke with heat in the cylinder to lower HC. .
本考案の内燃機関の排気浄化装置では、吸気或いは圧
縮行程にて噴射される通常の燃料噴射とは別に、燃焼が
終わった膨張行程或いは排気行程にある気筒内にも燃料
が噴射される。この膨張或いは排気行程に噴射された燃
料は、燃焼行程に会うことなく、気筒内の残留熱で熱分
解されて高級分子の鎖状結合が切れ、含有炭素数の少な
いいわゆる低級分子のHC分子として気筒から排出され
る。したがって、リーンNOx触媒に流れる排気ガスのHC
濃度が増え、しかもHCは低級分子の状態になっている。In the exhaust gas purifying apparatus for an internal combustion engine of the present invention, in addition to the normal fuel injection that is performed in the intake or compression stroke, fuel is also injected into the cylinder in the expansion stroke or exhaust stroke where combustion has ended. The fuel injected in this expansion or exhaust stroke is pyrolyzed by the residual heat in the cylinder without meeting the combustion stroke, breaking the chain bonds of higher molecules, and as a so-called lower molecule HC molecule having a small carbon content. Emitted from the cylinder. Therefore, the HC of the exhaust gas flowing to the lean NOx catalyst
The concentration is increasing, and HC is in a lower molecular state.
HCによる、リーンNOx触媒におけるNOx浄化メカニズム
は次のように推定される。The NOx purification mechanism in the lean NOx catalyst by HC is estimated as follows.
すなわち、排気ガス中の未燃HCは、大部分が酸化され
てCO2とH2Oになるが、一部は部分酸化されて活性種のCO
-になる。この活性種は一部がリーンNOx触媒の助けでNO
xと反応して、NOxを還元してN2とCO2にして無害化し、
残りは酸化されてCOになりさらに酸化されてCO2とな
る。この場合、排気ガス中のHC濃度が大になる程活性種
量も増え、NOx浄化が促進される。また、低級HC分子程
活性種生成量も増える。これが、本考案において、燃料
を膨張或いは排気行程にある気筒へ噴射し、低級HC分子
を増やす理由である。 That is, most of the unburned HC in the exhaust gas is oxidized to CO 2 and H 2 O, but part of it is partially oxidized and becomes the active species CO 2.
- to become. Part of this active species is NO with the help of lean NOx catalysts.
reacts with x to reduce NOx to N 2 and CO 2 to make it harmless,
The rest is oxidized to CO and further oxidized to CO 2 . In this case, as the HC concentration in the exhaust gas increases, the amount of active species also increases, and NOx purification is promoted. In addition, the lower the HC molecule, the greater the amount of active species produced. This is the reason why, in the present invention, fuel is injected into the cylinder in the expansion or exhaust stroke to increase the number of lower HC molecules.
以下に、本考案に係る内燃機関の排気浄化装置の望ま
しい実施例を、図面を参照して説明する。Hereinafter, a preferred embodiment of an exhaust gas purifying apparatus for an internal combustion engine according to the present invention will be described with reference to the drawings.
第１図は本考案実施例の排気浄化装置を示している。
第１図中、１は希薄燃焼を行う筒内噴射式内燃機関（た
とえば、ディーゼル機関、以下同じ）の燃料噴射ポン
プ、２はディーゼル機関の各気筒に設けた燃料噴射ノズ
ル２、３は燃料噴射ポンプ１からの軽油燃料を各燃料噴
射ノズル２に導く燃料供給通路である、＃１、＃２、＃
３、＃４は、たとえば４気筒の場合の、気筒No.を示
す。燃料噴射ノズル２と燃料供給通路３は気筒数だけあ
る。FIG. 1 shows an exhaust emission control device according to an embodiment of the present invention.
In FIG. 1, 1 is a fuel injection pump of a cylinder injection type internal combustion engine (for example, diesel engine, the same applies hereinafter) that performs lean combustion, 2 is fuel injection nozzles 2 and 3 provided in each cylinder of the diesel engine, and fuel injection is performed. Fuel supply passages for guiding the light oil fuel from the pump 1 to the respective fuel injection nozzles # 1, # 2, #
3 and # 4 indicate the cylinder numbers in the case of four cylinders, for example. There are as many fuel injection nozzles 2 and fuel supply passages 3 as there are cylinders.
第２図は第１図のII−II線断面を第１図よりも拡大し
た状態で示している。第２図中、＃１、＃２、＃３、＃
４はそれぞれ、＃１気筒、＃２気筒、＃３気筒、＃４気
筒に対応する燃料供給通路３を示している。燃料供給通
路３の途中には、燃料噴射期間にある気筒への燃料供給
通路３と、それと同時期に排気行程の初期にある気筒へ
の燃料供給通路３とを連通する連通路５が設けられてい
る。そして、各連通路５には、燃料噴射期間にある気筒
への燃料供給通路３の圧力が一定値を超えたときに、燃
料噴射期間にある気筒への燃料供給通路３にある燃料の
一部を排気行程にある気筒への燃料供給通路３にリリー
フするリリーフ弁４が設けられている。たとえば、着火
順序が＃１、＃３、＃４、＃２のエンジンでは、燃料の
リリーフは＃３→＃１、＃１→＃２、＃２→＃４、＃４
→＃３となる。FIG. 2 shows a cross section taken along line II-II of FIG. 1 in a state enlarged from that of FIG. In FIG. 2, # 1, # 2, # 3, #
Reference numeral 4 denotes the fuel supply passages 3 corresponding to the # 1 cylinder, # 2 cylinder, # 3 cylinder, and # 4 cylinder, respectively. In the middle of the fuel supply passage 3, there is provided a communication passage 5 that connects the fuel supply passage 3 to the cylinder in the fuel injection period and the fuel supply passage 3 to the cylinder in the initial stage of the exhaust stroke at the same time. ing. Then, in each communication passage 5, when the pressure of the fuel supply passage 3 to the cylinder in the fuel injection period exceeds a certain value, a part of the fuel in the fuel supply passage 3 to the cylinder in the fuel injection period A relief valve 4 is provided to relieve the fuel supply passage 3 to the cylinder in the exhaust stroke. For example, in an engine having an ignition order of # 1, # 3, # 4, # 2, the relief of fuel is # 3 → # 1, # 1 → # 2, # 2 → # 4, # 4.
→ It becomes # 3.
第３図は、たとえば＃３気筒の燃料供給通路３に対し
て設けられたリリーフ弁４を示している。リリーフ弁４
はスプリング６によって、＃１気筒に接続する燃料供給
通路３から＃３気筒に接続する燃料供給通路３に向って
付勢されている。＃３気筒が吸気行程にあるとき、＃３
気筒に接続する燃料供給通路３の燃料圧力がスプリング
６の付勢力から決められる一定値を超えると、リリーフ
弁４は開き、微料燃料を＃１気筒に接続する燃料供給通
路３内にリリーフし、＃１気筒の燃料噴射ノズル２を介
して、排気行程初期にある＃１気筒内に噴射する。リリ
ーフ弁４の開弁圧は、後述するリーンNOx触媒に供給さ
れるHCの量が適切になるように定める。FIG. 3 shows a relief valve 4 provided for the fuel supply passage 3 of the # 3 cylinder, for example. Relief valve 4
Is urged by the spring 6 from the fuel supply passage 3 connected to the # 1 cylinder toward the fuel supply passage 3 connected to the # 3 cylinder. # 3 When the cylinder is in the intake stroke, # 3
When the fuel pressure in the fuel supply passage 3 connected to the cylinder exceeds a certain value determined by the urging force of the spring 6, the relief valve 4 opens and the fine fuel is relieved in the fuel supply passage 3 connected to the # 1 cylinder. , Through the fuel injection nozzle 2 of the # 1 cylinder into the # 1 cylinder at the beginning of the exhaust stroke. The valve opening pressure of the relief valve 4 is determined so that the amount of HC supplied to the lean NOx catalyst described later is appropriate.
第４図は、ディーゼル機関とその吸、排系を示してい
る。７はディーゼル機関、８は吸気マニホルド、９は排
気マニホルド、11は必要に応じて設けられる改質装置で
ある。排気系には、そして改質装置11が設けられる場合
はその下流に、リーンNOx触媒10を含む触媒コンバータ
が設けられる。改質装置11は、軽油燃料の炭素数の多い
高級分子を炭素数の少ない低級分子に熱分解する装置で
ある。リーンNOx触媒10は、貴金属もしくは遷移金属を
担持せしめたゼオライト系触媒からなり、かかる触媒は
希薄空燃比領域でNOx還元能力を有する。ただし、NOx浄
化能力には、前記の如く、HCの存在、とりわけ低級HCの
存在が必要である。FIG. 4 shows a diesel engine and its intake and exhaust systems. Reference numeral 7 is a diesel engine, 8 is an intake manifold, 9 is an exhaust manifold, and 11 is a reformer provided as necessary. A catalytic converter including the lean NOx catalyst 10 is provided in the exhaust system, and downstream of the reformer 11 when provided. The reformer 11 is a device for thermally decomposing high-molecular-weight molecules of light oil fuel having a high carbon number into lower-molecular-weight molecules having a low carbon number. The lean NOx catalyst 10 is composed of a zeolite-based catalyst supporting a noble metal or a transition metal, and the catalyst has a NOx reducing ability in a lean air-fuel ratio region. However, the NOx purification capacity requires the presence of HC, especially the presence of lower HC, as described above.
つぎに、作用について説明する。 Next, the operation will be described.
ある気筒、たとえば＃３気筒が燃料噴射期間にあると
き、別の気筒、すなわち＃１気筒が排気行程初期にあ
る。＃３気筒に噴射された燃料は燃焼行程を経て熱機関
としての仕事をした後、排気系に排出される。この場合
NOxが生成しているので、NOxとともに排出される。＃３
気筒の燃料供給通路３の圧力は一定値を超えるから一部
がリリーフ弁４、連通路５を通して＃１気筒の燃料供給
通路３にリリーフされ、＃１気筒の燃料噴射ノズル２を
介して＃１気筒に噴射される。＃１気筒に噴射された微
量の燃料は、＃１気筒が排気行程にあるから燃焼されな
いでそのまま排出される。＃１気筒から排出される前
に、＃１気筒の燃焼ガスに残存している熱によってHCは
熱分解され、低級分子、たとえばＣが３個のプロピレン
になる。＃３気筒からのNOxを含む排出ガスと＃１気筒
からの低級HCを含む排出ガスとは排気マニホルド９の合
流部で合流されて、リーンNOx触媒に至る。リーンNOx触
媒10の助けを借りて、前記メカニズムに従って、NOxは
還元され、N2とCO2になって無害化される。この還元
は、＃１気筒にリリーフされ、＃１気筒で熱分解され
た、必要量の低級HCによって、十分に行われる。したが
って、リーンNOx触媒10を通って大気に排出される排出
ガスに含まれるNOxは十分に低減されている。When one cylinder, for example, the # 3 cylinder is in the fuel injection period, another cylinder, that is, the # 1 cylinder is in the early stage of the exhaust stroke. The fuel injected into the # 3 cylinder passes through the combustion stroke, works as a heat engine, and is then discharged to the exhaust system. in this case
Since NOx is produced, it is emitted together with NOx. # 3
Since the pressure of the fuel supply passage 3 of the cylinder exceeds a certain value, a part of the pressure is relieved to the fuel supply passage 3 of the # 1 cylinder through the relief valve 4 and the communication passage 5, and the fuel is injected through the fuel injection nozzle 2 of the # 1 cylinder to # 1. It is injected into the cylinder. The small amount of fuel injected into the # 1 cylinder is discharged without being burned because the # 1 cylinder is in the exhaust stroke. Before being discharged from the # 1 cylinder, HC is thermally decomposed by the heat remaining in the combustion gas of the # 1 cylinder, and lower molecules, for example, C, become three propylene. The exhaust gas containing NOx from the # 3 cylinder and the exhaust gas containing low-grade HC from the # 1 cylinder are combined at the confluence of the exhaust manifold 9 to reach the lean NOx catalyst. With the help of the lean NOx catalyst 10, NOx is reduced and rendered harmless to N 2 and CO 2 according to the mechanism described above. This reduction is sufficiently performed by the required amount of low-grade HC which is reliefed in the # 1 cylinder and thermally decomposed in the # 1 cylinder. Therefore, the NOx contained in the exhaust gas discharged to the atmosphere through the lean NOx catalyst 10 is sufficiently reduced.
上記の排気浄化装置は、連通路５とリリーフ弁４を従
来装置に加設するだけで済み、特別な燃料圧送装置や、
特別な制御装置を設けることを必要としない。たとえ
ば、リリーフ弁４は、スプリング６の付勢力を超えると
自動的に開弁し、特別な、HC供給のための、タイミング
制御装置等を一切必要としない。このため、コストアッ
プがほとんどなく、また、構造がシンプルであるから作
動、耐久上の信頼性も高い。In the above exhaust gas purification device, the communication passage 5 and the relief valve 4 need only be added to the conventional device, and a special fuel pressure feeding device,
No special control device need be provided. For example, the relief valve 4 automatically opens when the biasing force of the spring 6 is exceeded, and no special timing control device for supplying HC is required. For this reason, there is almost no increase in cost, and since the structure is simple, the operation and durability are high.
リーンNOx触媒は、NOx浄化を促進させるには、HC、と
りわけ低級HCを必要とするが、本考案によれば、膨張・
排気行程にある気筒内に燃料が噴射され、その燃料が気
筒内の残留熱により熱分解されて低級HCとなり排気され
るので、リーンNOx触媒は必要十分な量の低級HCの供給
をうけることができ、NOx浄化率が向上する。The lean NOx catalyst requires HC, especially low-grade HC, to accelerate NOx purification.
Fuel is injected into the cylinder in the exhaust stroke, and the fuel is thermally decomposed by the residual heat in the cylinder to become low-grade HC and exhausted, so the lean NOx catalyst can be supplied with a sufficient amount of low-grade HC. The NOx purification rate is improved.
また、吸気或いは圧縮行程に燃料を噴射する燃料噴射
手段と同じ手段が膨張或いは排気行程にある気筒に燃料
を噴射する手段として用いられるので、新たにHC供給手
段を設ける必要がない。さらに、気筒が膨張或いは排気
行程に筒内に噴射された燃料を筒内の熱で分解しNOxの
還元に効果のある低級HCに改質してリーンNOx触媒へ供
給する改質装置として用いられるので、専用の燃料改質
装置等を付加する必要もない。つまり僅かな改良のみで
よいので大幅なコストアップを招くこともなく、また装
置の信頼性を大幅に低下させることも無い。Further, since the same means as the fuel injection means for injecting fuel in the intake or compression stroke is used as the means for injecting fuel into the cylinder in the expansion or exhaust stroke, it is not necessary to newly provide the HC supply means. Further, it is used as a reformer that reforms the fuel injected into the cylinder during the expansion or exhaust stroke of the cylinder by the heat in the cylinder to reform it to lower HC that is effective in reducing NOx and supplies it to the lean NOx catalyst. Therefore, it is not necessary to add a dedicated fuel reformer or the like. That is, since only a slight improvement is required, the cost is not increased significantly, and the reliability of the device is not significantly lowered.
第１図は本考案に係る内燃機関の排気浄化装置の概略系
統図、 第２図は第１図のII−II線に沿う断面図、 第３図は第２図のリリーフ弁近傍の拡大断面図、 第４図は希薄燃焼を行う内燃機関とその吸・排気系の概
略平面図、 である。 １……燃料噴射ポンプ ２……燃料噴射ノズル ３……燃料供給通路 ４……リリーフ弁 ５……連通路 ６……スプリング ７……希薄燃焼を行う内燃機関、たとえばディーゼル機
関 ９……排気マニホルド 10……リーンNOx触媒FIG. 1 is a schematic system diagram of an exhaust purification system for an internal combustion engine according to the present invention, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is an enlarged sectional view in the vicinity of the relief valve in FIG. FIG. 4 is a schematic plan view of an internal combustion engine that performs lean combustion and its intake and exhaust systems. 1 ... Fuel injection pump 2 ... Fuel injection nozzle 3 ... Fuel supply passage 4 ... Relief valve 5 ... Communication passage 6 ... Spring 7 ... Internal combustion engine performing lean combustion, for example, diesel engine 9 ... Exhaust manifold 10: lean NOx catalyst
Claims (1)
る燃料噴射手段を有し希薄空燃比領域で運転される筒内
噴射式内燃機関と、その排気通路に設けられた酸素過剰
の排気中でNOxを還元、浄化するリーンNOx触媒と、から
なる内燃機関の排気浄化装置において、前記吸気或いは
圧縮行程で燃料を噴射する燃料噴射手段が膨張或いは排
気行程にある気筒内に燃料の一部を噴射する手段として
用いられ、前記気筒が膨張或いは排気行程で筒内に噴射
された燃料を筒内の熱で分解して低級HCとする改質装置
として用いられることを特徴とする内燃機関の排気浄化
装置。1. An in-cylinder injection type internal combustion engine having fuel injection means for injecting fuel into a cylinder during an intake or compression stroke and operated in a lean air-fuel ratio region, and an excess oxygen exhaust gas provided in an exhaust passage thereof. In an exhaust gas purification device for an internal combustion engine, which comprises a lean NOx catalyst that reduces and purifies NOx, a part of the fuel in the cylinder in which the fuel injection means that injects fuel in the intake or compression stroke is in the expansion or exhaust stroke Of the internal combustion engine, wherein the cylinder is used as a reformer that decomposes the fuel injected into the cylinder in the expansion or exhaust stroke with heat in the cylinder to lower HC. Exhaust purification device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989129145U JP2501542Y2 (en) | 1989-11-06 | 1989-11-06 | Exhaust gas purification system for diesel engines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989129145U JP2501542Y2 (en) | 1989-11-06 | 1989-11-06 | Exhaust gas purification system for diesel engines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0368516U JPH0368516U (en) | 1991-07-05 |
| JP2501542Y2 true JP2501542Y2 (en) | 1996-06-19 |
Family
ID=31676801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989129145U Expired - Lifetime JP2501542Y2 (en) | 1989-11-06 | 1989-11-06 | Exhaust gas purification system for diesel engines |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2501542Y2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4404123B2 (en) | 2007-09-07 | 2010-01-27 | トヨタ自動車株式会社 | Additive dispersion plate structure in exhaust passage |
| JP4375465B2 (en) | 2007-09-14 | 2009-12-02 | トヨタ自動車株式会社 | Additive dispersion plate structure in exhaust passage |
| JP4600457B2 (en) * | 2007-10-02 | 2010-12-15 | トヨタ自動車株式会社 | Additive dispersion plate structure in exhaust passage |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6338619U (en) * | 1986-08-29 | 1988-03-12 | ||
| DE3713169A1 (en) * | 1987-04-17 | 1988-11-03 | Bayer Ag | METHOD AND DEVICE FOR REDUCING NITROGEN OXIDES |
-
1989
- 1989-11-06 JP JP1989129145U patent/JP2501542Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0368516U (en) | 1991-07-05 |
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