JPS6233938Y2 - - Google Patents

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Publication number
JPS6233938Y2
JPS6233938Y2 JP11950682U JP11950682U JPS6233938Y2 JP S6233938 Y2 JPS6233938 Y2 JP S6233938Y2 JP 11950682 U JP11950682 U JP 11950682U JP 11950682 U JP11950682 U JP 11950682U JP S6233938 Y2 JPS6233938 Y2 JP S6233938Y2
Authority
JP
Japan
Prior art keywords
exhaust gas
filter
exhaust
particulate matter
particulate
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
Application number
JP11950682U
Other languages
Japanese (ja)
Other versions
JPS5924917U (en
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP11950682U priority Critical patent/JPS5924917U/en
Publication of JPS5924917U publication Critical patent/JPS5924917U/en
Application granted granted Critical
Publication of JPS6233938Y2 publication Critical patent/JPS6233938Y2/ja
Granted legal-status Critical Current

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  • Exhaust-Gas Circulating Devices (AREA)

Description

【考案の詳細な説明】 本考案は、排気ガス中に含まれるパテイキユレ
ートを耐熱性フイルタに捕集してこれを一定条件
の下で再燃焼処理して浄化するようにしたパテイ
キユレート浄化装置に関する。
[Detailed Description of the Invention] The present invention relates to a particulate matter purification device that collects particulate matter contained in exhaust gas in a heat-resistant filter and purifies it by re-burning it under certain conditions.

かかるパテイキユレートは、主として煤である
炭化物とハイドロカーボン微粒子の集合物で導電
性を有している。排気ガス中のNOxを低減する
ために排気ガス還流(EGR)を行わせるとパテ
イキユレートの含有量は増大する傾向があり、特
に高負荷運転時にはそれが甚しい。このようなパ
テイキユレートが大気中に放出されることを予防
するために排気ガス通路に耐熱性フイルタを介装
し、このフイルタでパテイキユレートを捕集する
装置が知られている。
This particulate is an aggregate of carbide, which is mainly soot, and fine hydrocarbon particles, and has electrical conductivity. When exhaust gas recirculation (EGR) is performed to reduce NOx in exhaust gas, the particulate content tends to increase, especially during high-load operation. In order to prevent such particulate matter from being released into the atmosphere, an apparatus is known in which a heat-resistant filter is interposed in the exhaust gas passage and the particulate matter is collected by the filter.

ところで、フイルタに捕集されて堆積するパテ
イキユレートを放置すると、フイルタの瀘過抵抗
は大となり機関の排圧を上昇させて機関出力及び
排気エミツシヨン性能を阻害してしまうおそれが
ある。一般にパテイキユレートは、略500℃以上
で自発火燃焼して無害となるが、ヂイーゼル機関
の排気ガス温度は高速高負荷運転時には、燃焼室
近傍の排気ガス通路では500゜〜750℃に達するの
でパテイキユレートは燃焼しフイルタは再生され
る。しかしながら、定常走行時には排気ガス温度
は120゜〜400℃の範囲であるからパテイキユレー
トを燃焼させるに至らずフイルタの目詰りは解消
できない。
By the way, if the particulate matter collected and deposited on the filter is left unattended, the filtration resistance of the filter becomes large and the exhaust pressure of the engine increases, which may impede the engine output and exhaust emission performance. In general, particulate combusts spontaneously at temperatures above 500°C and becomes harmless, but the exhaust gas temperature of a diesel engine reaches 500° to 750°C in the exhaust gas passage near the combustion chamber during high-speed, high-load operation. It burns and the filter is regenerated. However, during steady running, the exhaust gas temperature is in the range of 120° to 400°C, so the particulate is not burned and the filter clogging cannot be eliminated.

そこで、フイルタの上流に排気ガス加熱用のバ
ーナを取付け、フイルタ入口の排圧が予め設定さ
れた特定の機関回転速度と負荷条件における設定
値以上に達した段階でバーナを作動させたり、又
は車両走行距離が所定値を超えた場合やタイマな
どを用いて規則的な間隔でバーナを作動させたり
して、パテイキユレートを燃焼させ、フイルタの
目詰りを解消させていた。
Therefore, a burner for heating the exhaust gas is installed upstream of the filter, and the burner is activated when the exhaust pressure at the filter inlet reaches a preset value for a specific engine speed and load condition. When the mileage exceeded a predetermined value, or by using a timer, the burner was activated at regular intervals to burn particulate and unclog the filter.

ところが、これらの加熱用のバーナには燃料を
供給又は制限するために燃料制御弁が設けられて
いるが、この燃料制御弁の作動不良によつてバー
ナの非作動時にも燃料が供給され排気管端から垂
れ流しとなつて公害を発生させ、かかる状態で点
火プラグが作動すれば大量の燃料が引火して爆発
などの事故につながる欠点があつた。そしてこの
欠点を解決するために更にバーナへの配管に電磁
弁を追加すれば故障個所が更に増加するという新
たな欠点を生ずる。
However, these heating burners are equipped with fuel control valves to supply or restrict fuel, but if this fuel control valve malfunctions, fuel may be supplied even when the burners are not in operation, causing problems in the exhaust pipe. The drawback was that the fuel dripped from the end, causing pollution, and if the spark plug operated under such conditions, a large amount of fuel would ignite, leading to an explosion or other accident. If a solenoid valve is further added to the piping to the burner in order to solve this drawback, a new drawback arises in that the number of failure points further increases.

本考案の目的は、従来の上記した欠点を解消し
排気管にバーナを設ける必要のないパテイキユレ
ート浄化装置を提供することにある。
An object of the present invention is to provide a particulate purification device that eliminates the above-mentioned conventional drawbacks and does not require a burner in the exhaust pipe.

かかる目的は、排気ガス通路に設けられたパテ
イキユレート捕集用の耐熱性フイルタと、複数気
筒のうちの特定の気筒に過剰率の排気ガス還流を
行なう排気ガス還流手段とを備えたことを特徴と
するパテイキユレート浄化装置によつて達成され
る。
This object is characterized by comprising a heat-resistant filter for collecting particulate matter provided in the exhaust gas passage, and an exhaust gas recirculation means for recirculating an excessive amount of exhaust gas to a specific cylinder among the plurality of cylinders. This is achieved by a particulate purification device.

以下図示の実施例につき詳細に説明する。 The illustrated embodiment will be described in detail below.

図において、符号1はエンジン本体を示し、エ
ンジン本体1の図中右側にインテイクマニホルド
2およびエキゾーストマニホルド3が取付けられ
ている。この場合エンジンは4シリンダ直列型を
示しており、マニホルドはそれぞれ4シリンダへ
連結されている。エキゾーストマニホルド3には
排気管4が接続され、排気管4にはフイルタ装置
5が介装されている。フイルタ装置5は、ケース
6内にステンレスの波形板7を介し弾力的に耐熱
性フイルタ8が支持装着されて構成される。耐熱
性フイルタ8は、例えばハニカム形状のセラミツ
ク又はセラミツクコーテイングをしたワイヤメツ
シユあるいはグラスフアイバ織物からなつて、平
均0.3μ直径の微粒子を捕集し燃焼させるのに好
適な構造と耐熱性を有している。
In the figure, reference numeral 1 indicates an engine body, and an intake manifold 2 and an exhaust manifold 3 are attached to the right side of the engine body 1 in the figure. In this case, the engine is a 4-cylinder in-line type, and the manifolds are connected to each of the 4 cylinders. An exhaust pipe 4 is connected to the exhaust manifold 3, and a filter device 5 is interposed in the exhaust pipe 4. The filter device 5 includes a heat-resistant filter 8 elastically supported and mounted in a case 6 via a stainless steel corrugated plate 7. The heat-resistant filter 8 is made of, for example, honeycomb-shaped ceramic, ceramic-coated wire mesh, or glass fiber fabric, and has a structure and heat resistance suitable for collecting and burning fine particles with an average diameter of 0.3 μm. .

インテイクマニホルド2に接続される吸気管9
には、主EGR装置10が取付けられている。主
EGR装置10は、弁11,弁体12,負圧室1
3などからなり、負圧室13の圧力とスプリング
14との合成力を弁11に作用させている。更
に、詳しくは弁体12はL形通路を形成していて
吸気管9および排気管4に接続するバイパス15
とにそれぞれ連通しており、弁11は上記L形通
路を遮断可能に支持されていて弁11の両面に作
用する排気圧力および吸気圧力と上記合成力とに
よつてL形通路を開閉し、排気ガスを吸気系統へ
還流させたり制限させたりするようになつてい
る。負圧室13は制御弁16を介して真空タンク
17に連通しており、真空タンク17はクランク
プーリ18によつて駆動される真空ポンプ19に
接続される。
Intake pipe 9 connected to intake manifold 2
A main EGR device 10 is attached to the . main
The EGR device 10 includes a valve 11, a valve body 12, and a negative pressure chamber 1.
3, etc., and causes the combined force of the pressure in the negative pressure chamber 13 and the spring 14 to act on the valve 11. Furthermore, in detail, the valve body 12 forms an L-shaped passage and has a bypass 15 connected to the intake pipe 9 and the exhaust pipe 4.
The valve 11 is supported to be able to shut off the L-shaped passage, and opens and closes the L-shaped passage by the exhaust pressure and intake pressure acting on both sides of the valve 11 and the combined force. It is designed to recirculate or restrict exhaust gas to the intake system. The negative pressure chamber 13 communicates with a vacuum tank 17 via a control valve 16, and the vacuum tank 17 is connected to a vacuum pump 19 driven by a crank pulley 18.

次に、本考案の特徴である補助EGR装置10
Aは、上記した主EGR装置10の構成と同様で
あるので、部品名を同一とし符号はサフイツクス
Aを付して各部品の説明を省略する。
Next, the auxiliary EGR device 10, which is a feature of the present invention,
Since A is the same as the configuration of the main EGR device 10 described above, the parts have the same names, the suffix A is added to the reference numerals, and the description of each part is omitted.

補助EGR装置10Aは、4シリンダのうちの
特定シリンダ例えば図中上端の一番シリンダに接
続する分岐管2aに取付けられている。すなわ
ち、弁11Aの両面に作用する排気圧力および吸
気圧力と、負圧室13A内における負圧とスプリ
ング14Aとの合成力によつて弁11Aは排気ガ
スをバイパス15を介して分岐管2aに還流した
り制限したりする。負圧室13A内の負圧の調整
は制御弁16Aの作動を介して行われ、制御弁1
6Aへの指令は図示しない公知の手段によつて自
動又は手動によつてなされる。
The auxiliary EGR device 10A is attached to a branch pipe 2a connected to a specific cylinder among the four cylinders, for example, the cylinder at the top end in the figure. That is, the valve 11A returns the exhaust gas to the branch pipe 2a via the bypass 15 by the combined force of the exhaust pressure and intake pressure acting on both sides of the valve 11A, the negative pressure in the negative pressure chamber 13A, and the spring 14A. to do or limit. Adjustment of the negative pressure in the negative pressure chamber 13A is performed through the operation of the control valve 16A.
Commands to 6A are issued automatically or manually by known means (not shown).

以上の構成において、車両走行中に主EGR装
置10は所定の条件の下に作動してNOxを低減
させかつ煙成分、パテイキユレートが過大に発生
することのない程度、すなわちEGR率は0〜50
%の範囲に制御されている。
In the above configuration, the main EGR device 10 operates under predetermined conditions while the vehicle is running to reduce NOx and to a degree that does not excessively generate smoke components and particulate matter, that is, the EGR rate is 0 to 50.
It is controlled within a range of %.

さて、耐熱性フイルタ8にパテイキユレートが
所定量堆積すると、自動又は手動によつて制御弁
16Aの作動が行われ、負圧室13A内における
負圧が強まり、弁11Aが引上げられて排気ガス
がバイパス15から弁体12Aを通つて分岐管2
aに入り込み一番シリンダに還流される。その際
肝要なことはEGR率が約50%を超えた過剰率を
もつて行われることであつて、このためシリンダ
内の最高温度は低くなる代りに、燃焼が長びいて
燃焼後半の温度が高くなる。従つてシリンダから
高温状態で排出されるので、耐熱性フイルタ8は
加熱されて温度が上昇しパテイキユレートを燃焼
させることができる。
Now, when a predetermined amount of particulate matter is deposited on the heat-resistant filter 8, the control valve 16A is activated automatically or manually, the negative pressure in the negative pressure chamber 13A is strengthened, the valve 11A is pulled up, and the exhaust gas is bypassed. 15 to the branch pipe 2 through the valve body 12A.
a and is first refluxed to the cylinder. What is important in this case is that the EGR rate is carried out at an excess rate exceeding approximately 50%, and as a result, although the maximum temperature inside the cylinder is lowered, combustion is prolonged and the temperature in the latter half of combustion is lowered. It gets expensive. Therefore, since the particulate is discharged from the cylinder in a high temperature state, the heat-resistant filter 8 is heated and the temperature rises, so that the particulate can be combusted.

このように本考案は、二重EGR装置の設置に
より特定シリンダのみ過剰排気還流を行なつて排
気温度を上昇させるものであり、しかも特定シリ
ンダ以外の他シリンダは定常運転であるからドラ
イビリテイの悪化は無視できる。
In this way, the present invention increases exhaust temperature by recirculating excess exhaust gas only in specific cylinders by installing a dual EGR device, and since all cylinders other than the specific cylinder are in steady operation, there is no deterioration in drivability. Can be ignored.

本実施例では主EGR装置が取付けられている
エンジンについて本考案が適用されているが、本
考案はこれに限定するものでなくEGR装置のな
いエンジンにも適用できることはいうまでもな
い。
In this embodiment, the present invention is applied to an engine equipped with a main EGR device, but it goes without saying that the present invention is not limited to this and can be applied to an engine without an EGR device.

【図面の簡単な説明】[Brief explanation of the drawing]

図は本考案によるパテイキユレート浄化装置の
一例を示す構成図である。 1……エンジン本体、2……インテイクマニホ
ルド、4……排気管、5……フイルタ装置、8…
…耐熱性フイルタ、10A……補助EGR装置。
The figure is a configuration diagram showing an example of a particulate matter purifying device according to the present invention. 1...Engine body, 2...Intake manifold, 4...Exhaust pipe, 5...Filter device, 8...
...Heat-resistant filter, 10A...Auxiliary EGR device.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 排気ガス通路に設けられたパテイキユレート捕
集用の耐熱性フイルタと、複数気筒のうちの特定
の気筒に過剰率の排気ガス還流を行なう排気ガス
還流手段とを備えたことを特徴とするパテイキユ
レート浄化装置。
A particulate matter purification device comprising: a heat-resistant filter for collecting particulate matter provided in an exhaust gas passage; and an exhaust gas recirculation means for recirculating an excessive amount of exhaust gas to a specific cylinder among a plurality of cylinders. .
JP11950682U 1982-08-06 1982-08-06 Pateikurate purification equipment Granted JPS5924917U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11950682U JPS5924917U (en) 1982-08-06 1982-08-06 Pateikurate purification equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11950682U JPS5924917U (en) 1982-08-06 1982-08-06 Pateikurate purification equipment

Publications (2)

Publication Number Publication Date
JPS5924917U JPS5924917U (en) 1984-02-16
JPS6233938Y2 true JPS6233938Y2 (en) 1987-08-31

Family

ID=30274242

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11950682U Granted JPS5924917U (en) 1982-08-06 1982-08-06 Pateikurate purification equipment

Country Status (1)

Country Link
JP (1) JPS5924917U (en)

Also Published As

Publication number Publication date
JPS5924917U (en) 1984-02-16

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