JPH0680812U - Engine exhaust purification device - Google Patents

Engine exhaust purification device

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Publication number
JPH0680812U
JPH0680812U JP2222093U JP2222093U JPH0680812U JP H0680812 U JPH0680812 U JP H0680812U JP 2222093 U JP2222093 U JP 2222093U JP 2222093 U JP2222093 U JP 2222093U JP H0680812 U JPH0680812 U JP H0680812U
Authority
JP
Japan
Prior art keywords
catalyst
pipe
exhaust
engine
exhaust gas
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
Application number
JP2222093U
Other languages
Japanese (ja)
Inventor
健造 小松
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Subaru Corp
Original Assignee
Fuji Jukogyo KK
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 by Fuji Jukogyo KK filed Critical Fuji Jukogyo KK
Priority to JP2222093U priority Critical patent/JPH0680812U/en
Publication of JPH0680812U publication Critical patent/JPH0680812U/en
Pending legal-status Critical Current

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Abstract

(57)【要約】 【目的】 エンジンの冷態始動時における触媒の活性化
を図るとともに、暖機後の触媒の過剰な温度上昇を抑止
したエンジンの排気浄化装置の提供。 【構成】 エンジンの排気浄化装置を、エンジン本体1
に繋がる排気管2に接続し、触媒3を内蔵する内管4
と、内管4を囲繞する外管5とよりなる二重管6と、外
管5と内管下流の排気管7とを、逆止弁9を介して接続
する分岐管10と、内管4と内管下流の排気管7とを接
続する切換え弁8とを備えてなり、切換え弁8の切換え
により、内管4を通過後の排気が、外管5内に流出する
か、そのまま排気管7へ向かうか選択できるように構成
した。
(57) [Abstract] [Purpose] To provide an exhaust emission control device for an engine, which activates the catalyst at the time of cold start of the engine and suppresses excessive temperature rise of the catalyst after warming up. [Structure] An engine exhaust gas purification device is provided for an engine body 1
The inner pipe 4 which is connected to the exhaust pipe 2 and which contains the catalyst 3
A double pipe 6 composed of an outer pipe 5 surrounding the inner pipe 4, a branch pipe 10 connecting the outer pipe 5 and an exhaust pipe 7 downstream of the inner pipe via a check valve 9, and an inner pipe 4 and a switching valve 8 that connects the exhaust pipe 7 downstream of the inner pipe. By switching the switching valve 8, the exhaust gas that has passed through the inner pipe 4 either flows into the outer pipe 5 or is exhausted as it is. It is configured so that it can be selected whether to go to the tube 7.

Description

【考案の詳細な説明】[Detailed description of the device]

【0001】[0001]

【産業上の利用分野】[Industrial applications]

本考案は、エンジンの排気浄化装置に関するものである。 The present invention relates to an engine exhaust gas purification device.

【0002】[0002]

【従来の技術】[Prior art]

エンジンの排気システムにおける排気浄化装置については、従来種々の技術が 開発されている。図3は特開昭58−59308号公報に開示された気筒数制御 エンジンにおける排気管装置を示す構成図である。一般に気筒数制御エンジンに おいては、エンジン軽負荷時に休止している気筒から排出される低温の新気には HCなどの有害成分が含まれているが、低温による触媒の不活性により上記有害 成分が浄化されずに大気中に放出される恐れがある。 Conventionally, various technologies have been developed for exhaust emission control devices in engine exhaust systems. FIG. 3 is a configuration diagram showing an exhaust pipe device in a cylinder number control engine disclosed in JP-A-58-59308. Generally, in a cylinder number control engine, harmful components such as HC are contained in the low temperature fresh air discharged from the cylinders that are idle when the engine is lightly loaded. The components may be released into the atmosphere without being purified.

【0003】 上記発明はこれを回避するためなされたもので、図3にみるように、排気通路 を休止側の気筒#1〜#3と稼働側の気筒#4〜#6に対応して休止側排気通路 21と稼働側排気通路22とに分割し、この両排気通路に対応して排気浄化用の 触媒23を配設するとともに、この触媒23と排気通路21,22の触媒流入部 25を囲う合流通路24を形成して、触媒通過後の排気をこの合流通路24に導 き、#1〜#3気筒からの新気及び触媒23を加熱し、触媒23の活性を高めよ うとするものである。The above invention has been made to avoid this, and as shown in FIG. 3, the exhaust passage is deactivated corresponding to the deactivated side cylinders # 1 to # 3 and the activated side cylinders # 4 to # 6. The exhaust side exhaust passage 21 and the working side exhaust passage 22 are divided, and an exhaust purification catalyst 23 is arranged corresponding to both the exhaust passages, and the catalyst 23 and the catalyst inflow portion 25 of the exhaust passages 21 and 22 are arranged. An enclosing confluent passage 24 is formed to guide the exhaust gas after passing through the catalyst to the confluent passage 24 to heat the fresh air from the # 1 to # 3 cylinders and the catalyst 23 to enhance the activity of the catalyst 23. is there.

【0004】 また図4は特開平2−291414号公報に開示された内燃機関の排気浄化装 置の構成図である。この排気浄化装置は、V型に配置された内燃機関において、 後側機関31の第1排気管33と前側機関32の第2排気管34との合流部位よ りも下流側に触媒コンバータ35を設け、上記合流部位に上流側が2重管状に区 画形成され、かつ下流側が合流する合流管36を設けるとともに、この合流管上 流側の排気管37内にサブ触媒であるスタートキャット38を内蔵させて構成さ れている。FIG. 4 is a configuration diagram of an exhaust gas purification device for an internal combustion engine disclosed in Japanese Patent Laid-Open No. 2-291414. In this exhaust gas purification device, in a V-type internal combustion engine, a catalytic converter 35 is provided downstream of a confluence portion between the first exhaust pipe 33 of the rear engine 31 and the second exhaust pipe 34 of the front engine 32. The upstream side is formed into a double tubular shape and the downstream side is joined to the merging portion, and a merging pipe 36 is provided in the merging portion. It is made up of.

【0005】 この結果、後側機関31の排気は、合流管36においてスタートキャットを3 8通過したとき反応熱により加熱されて温度が上昇するので、触媒35を加熱し てその活性化を促進し、同時に前側機関32の排気は、合流管36において、ス タートキャット38を外部より加熱しその活性化を促進する。すなわち本発明に おいては、エンジン排気の保有する熱が、触媒35あるいはスタートキャット3 8の活性化に有効に利用されているのである。As a result, the exhaust gas of the rear engine 31 is heated by the reaction heat when passing through the start cat 38 in the confluence pipe 36 and its temperature rises. Therefore, the catalyst 35 is heated to promote its activation. At the same time, the exhaust of the front engine 32 heats the start cat 38 from the outside in the confluence pipe 36 to promote its activation. That is, in the present invention, the heat retained by the engine exhaust is effectively utilized for activating the catalyst 35 or the start cat 38.

【0006】[0006]

【考案が解決しようとする課題】[Problems to be solved by the device]

ところで上記従来の排気浄化装置において、前者の構造では、気筒#1〜#6 全部が作動しているときは、その熱で触媒が過剰に加熱されるので、触媒が溶損 などにより破壊される恐れや触媒の熱劣化を促進させる恐れがある。また後者に おいても、暖機後ではスタートキャットが過大な温度上昇により溶損などによる 破壊を招く恐れや触媒の熱劣化を促進させる恐れがある。 By the way, in the above-mentioned conventional exhaust emission control device, in the former structure, when all the cylinders # 1 to # 6 are operating, the catalyst heats up excessively, so that the catalyst is destroyed due to melting damage or the like. There is a risk of promoting heat deterioration of the catalyst. Also in the latter case, after warming up, the start cat may cause destruction due to melting loss or the like due to excessive temperature rise, or may accelerate thermal deterioration of the catalyst.

【0007】 本考案は、従来装置の上記欠点を解消するためになされたもので、排気浄化の ための触媒の活性化を図るとともに、エンジン暖機後における触媒の過大な温度 上昇を抑止し、溶損などによる触媒の破壊を防止した排気浄化装置を提供しよう とするものである。The present invention has been made in order to solve the above-mentioned drawbacks of the conventional device, and aims to activate the catalyst for purifying exhaust gas and prevent an excessive temperature rise of the catalyst after engine warm-up. It is intended to provide an exhaust emission control device that prevents the destruction of the catalyst due to melting damage and the like.

【0008】[0008]

【課題を解決するための手段】[Means for Solving the Problems]

上記目的を達成するため本考案は、エンジンの排気浄化装置を、エンジンの排 気管に接続し、触媒を内蔵する内部通路と、該内部通路を囲繞する外部通路と、 内部通路の触媒を通過した排気の、触媒下流の排気管への流出と、上記外部通路 への流出とを切換えるための切換え手段と、外部通路と触媒下流の排気管とを接 続し、逆止弁とを備えた分岐管とを備えて構成した。 To achieve the above object, the present invention connects an engine exhaust gas purification device to an engine exhaust pipe and passes an internal passage containing a catalyst, an external passage surrounding the internal passage, and a catalyst in the internal passage. A branching means provided with a switching means for switching the outflow of exhaust gas to the exhaust pipe downstream of the catalyst and to the above-mentioned external passage, the external passage and the exhaust pipe downstream of the catalyst, and a check valve. It is configured with a tube and.

【0009】[0009]

【作用】[Action]

エンジンの冷態時は、切換え手段を内部通路の触媒を通過した排気が外部通路 を通過し、分岐管を介して触媒下流の排気管に向かうように切換え手段を切換え る。この結果排気が外部通路を通過するとき、排気の有する熱で触媒を加熱する ので、触媒は活性化され、エンジン始動直後の冷態時であっても、排気の浄化は 行われる。 When the engine is in a cold state, the switching means is switched so that the exhaust gas passing through the catalyst in the internal passage passes through the external passage and goes to the exhaust pipe downstream of the catalyst via the branch pipe. As a result, when the exhaust gas passes through the external passage, the heat of the exhaust gas heats the catalyst, so that the catalyst is activated, and the exhaust gas is purified even in the cold state immediately after the engine is started.

【0010】 エンジンの暖機が進み触媒が十分に活性化した後は、切換え手段を切換えて内 部通路を触媒下流の排気管に接続し、触媒を通過した排気を直接触媒下流の排気 管に流出させる。その結果排気による触媒の加熱は停止され、触媒が過剰に加熱 されることはなく、触媒の溶損などのトラブルは発生しない。なお触媒下流の排 気管へ流出した脈動を伴う排気の、マフラなどの抵抗による上記外部通路などへ の影響は、上記逆止弁により阻止される。After the engine warms up and the catalyst is sufficiently activated, the switching means is switched to connect the internal passage to the exhaust pipe downstream of the catalyst, and the exhaust gas passing through the catalyst is directly supplied to the exhaust pipe downstream of the catalyst. Drain. As a result, the heating of the catalyst by the exhaust gas is stopped, the catalyst is not overheated, and troubles such as catalyst melting loss do not occur. It should be noted that the check valve prevents the influence of pulsating exhaust gas that has flowed out to the exhaust pipe downstream of the catalyst on the external passage due to the resistance of the muffler.

【0011】[0011]

【実施例】【Example】

図1は本考案の一実施例である排気浄化装置の構成図である。 図にみるように排気浄化装置は、エンジン本体1に繋がる排気管2に接続し、 触媒3を内蔵する内管4と、内管4を囲繞する外管5とよりなる二重管6と、外 管5と内管下流の排気管7とを、逆止弁9を介して接続する分岐管10と、内管 4と内管下流の排気管7とを接続する切換え弁8とを備えてなり、切換え弁8の 切換えにより、内管4を通過後の排気が、外管5内に流出するか、そのまま排気 管7へ向かうか選択できるように構成されている。なお上記切換え弁8は耐熱性 を備えた材料で形成される必要がある。本考案に係る排気浄化装置はこのように 構成されている。 FIG. 1 is a block diagram of an exhaust gas purification apparatus which is an embodiment of the present invention. As shown in the figure, the exhaust gas purification device is connected to an exhaust pipe 2 connected to the engine body 1, and has a double pipe 6 composed of an inner pipe 4 containing a catalyst 3 and an outer pipe 5 surrounding the inner pipe 4, A branch pipe 10 that connects the outer pipe 5 and the exhaust pipe 7 downstream of the inner pipe via a check valve 9 and a switching valve 8 that connects the inner pipe 4 and the exhaust pipe 7 downstream of the inner pipe are provided. By switching the switching valve 8, it is possible to select whether the exhaust gas after passing through the inner pipe 4 flows out into the outer pipe 5 or goes directly to the exhaust pipe 7. The switching valve 8 must be made of a material having heat resistance. The exhaust emission control device according to the present invention is constructed in this way.

【0012】 次に動作を説明する。一般にエンジン始動時の冷態時は、触媒3は温度も低く 排気の浄化能力が低下している。このとき内管4を通過後の排気が外管5に向か うように切換え弁8を切換えると、エンジン1の排気は、矢印A方向へ排気管2 から内管4を経て外管5に向かい、その後、分岐管10を経由して内管4下流の 排気管7より大気に放出される。この間排気は内管4内の触媒により有害成分が 浄化され、その際反応熱により温度が上昇し、外管5内を通過する時保有する熱 で触媒3を加熱する。この結果触媒3はエンジン始動直後の冷態時であっても活 性化され、排気の浄化は行われる。Next, the operation will be described. Generally, when the engine is in a cold state at the time of starting, the temperature of the catalyst 3 is low and the exhaust gas purification capability is low. At this time, when the switching valve 8 is switched so that the exhaust gas after passing through the inner pipe 4 is directed to the outer pipe 5, the exhaust gas of the engine 1 flows from the exhaust pipe 2 to the outer pipe 5 via the inner pipe 4 in the direction of arrow A. After that, it is discharged to the atmosphere from the exhaust pipe 7 downstream of the inner pipe 4 via the branch pipe 10. During this time, the exhaust gas is cleaned of harmful components by the catalyst in the inner pipe 4, the temperature of the exhaust gas is raised by the reaction heat, and the heat retained when passing through the outer pipe 5 heats the catalyst 3. As a result, the catalyst 3 is activated even in the cold state immediately after the engine is started, and the exhaust gas is purified.

【0013】 次にエンジン始動後、時間が経過し暖機された後は、触媒3は十分に活性化さ れているので、切換え弁8を切換えて、排気を内管4より矢印B方向すなわち内 管下流の排気管7に直接流出させる。このため触媒3は排気による加熱はなくな り、その結果、触媒3が過剰に加熱されて溶損するなどのトラブルはなくなる。 なお排気管7へ流出した脈動を伴う排気の、マフラなどの抵抗による外管への悪 影響は逆止弁9により抑止される。Next, after the engine is started and after the time has elapsed and the engine has been warmed up, the catalyst 3 is sufficiently activated, so the switching valve 8 is switched to direct the exhaust from the inner pipe 4 in the direction of arrow B, It is directly discharged to the exhaust pipe 7 downstream of the inner pipe. For this reason, the catalyst 3 is not heated by exhaust gas, and as a result, troubles such as excessive heating of the catalyst 3 and melting damage are eliminated. It should be noted that the check valve 9 suppresses the adverse effect of the pulsating exhaust gas flowing into the exhaust pipe 7 on the outer pipe due to the resistance of the muffler or the like.

【0014】 図2は本考案の他の実施例を示す排気浄化装置の構成図で、切換え弁8の代わ りに2個のカットバルブ11,12を内管4の出口に設けたものである。エンジ ン始動直後の冷態時は、カットバルブ11を開くとともにカットバルブ12を閉 じ、排気を内管4から外管5に導いて触媒3を加熱する。またエンジン暖機後は 、カットバルブ11を閉じてカットバルブ12を開き、排気を内管4より直接排 気管7に流出させる。FIG. 2 is a block diagram of an exhaust gas purification apparatus showing another embodiment of the present invention, in which two cut valves 11 and 12 are provided at the outlet of the inner pipe 4 instead of the switching valve 8. . When the engine is in a cold state immediately after starting, the cut valve 11 is opened and the cut valve 12 is closed, and exhaust gas is guided from the inner pipe 4 to the outer pipe 5 to heat the catalyst 3. After the engine is warmed up, the cut valve 11 is closed and the cut valve 12 is opened, so that the exhaust gas is directly discharged from the inner pipe 4 to the exhaust pipe 7.

【0015】[0015]

【考案の効果】[Effect of device]

本考案は、エンジンの排気浄化装置を、エンジンの排気管に接続し、触媒を内 蔵する内部通路と、該内部通路を囲繞する外部通路と、内部通路の触媒を通過し た排気の、触媒下流の排気管への流出と、上記外部通路への流出とを切換えるた めの切換え手段と、外部通路と触媒下流の排気管とを接続し、逆止弁とを備えた 分岐管とを備えて構成したので、次に述べるような優れた効果を挙げることにな った。 According to the present invention, an exhaust gas purifying apparatus for an engine is connected to an exhaust pipe of the engine, an internal passage for containing a catalyst, an external passage surrounding the internal passage, and a catalyst for exhaust gas passing through the catalyst in the internal passage are provided. A switching pipe for switching between the outflow to the exhaust pipe downstream and the outflow to the external passage; and a branch pipe connecting the external passage and the exhaust pipe downstream of the catalyst and having a check valve. Since it was configured as described above, it was possible to obtain the following excellent effects.

【0016】 (1) エンジンの始動時に、排気により触媒を加熱しその活性化を図るので、エン ジンが冷態時であっても排気の浄化は行われ、有害成分の排出量は低減する。 (2) またエンジン始動後時間を経過し、触媒が十分活性化した後は、排気による 触媒の加熱は停止されるので、触媒が過剰な温度上昇をきたすことなく、したが って触媒が溶損などにより破壊される恐れや触媒の熱劣化を促進させる恐れはな くなる。 (3) 装置が軽量で、設備コストが低廉である。(1) Since the catalyst is heated by the exhaust gas and activated when the engine is started, the exhaust gas is purified even when the engine is in a cold state, and the emission amount of harmful components is reduced. (2) In addition, after a certain time has passed since the engine was started and the catalyst has been sufficiently activated, heating of the catalyst by exhaust gas is stopped, so the catalyst does not rise excessively and the catalyst melts accordingly. There is no risk of destruction due to loss or the like, or promotion of thermal deterioration of the catalyst. (3) The equipment is lightweight and the equipment cost is low.

【図面の簡単な説明】[Brief description of drawings]

【図1】本考案の一実施例を示すエンジンの排気浄化装
置の構成図である。
FIG. 1 is a configuration diagram of an engine exhaust gas purification apparatus showing an embodiment of the present invention.

【図2】本考案の他の実施例を示すエンジンの排気浄化
装置の構成図である。
FIG. 2 is a schematic diagram of an engine exhaust gas purification apparatus showing another embodiment of the present invention.

【図3】従来の排気浄化装置の構成図である。FIG. 3 is a configuration diagram of a conventional exhaust emission control device.

【図4】従来の排気浄化装置の構成図である。FIG. 4 is a configuration diagram of a conventional exhaust emission control device.

【符号の説明】[Explanation of symbols]

1 エンジン本体 2 排気管 3 触媒 4 内管 5 外管 6 二重管 7 排気管 8 切換え弁 9 逆止弁 10 分岐管 11 カットバルブ 12カットバルブ 1 engine body 2 exhaust pipe 3 catalyst 4 inner pipe 5 outer pipe 6 double pipe 7 exhaust pipe 8 switching valve 9 check valve 10 branch pipe 11 cut valve 12 cut valve

Claims (3)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項1】 エンジンの排気管に接続し触媒を内蔵す
る内部通路と、 該内部通路を囲繞する外部通路と、 内部通路の触媒を通過した排気の、触媒下流の排気管へ
の流出と、上記外部通路への流出とを切換えるための切
換え手段と、 外部通路と触媒下流の排気管とを接続し、逆止弁とを備
えた分岐管とを備えて構成されたことを特徴とするエン
ジンの排気浄化装置。
1. An internal passage that is connected to an exhaust pipe of an engine and contains a catalyst, an external passage that surrounds the internal passage, and an exhaust gas that passes through the catalyst in the internal passage and flows into an exhaust pipe downstream of the catalyst. An engine characterized by comprising switching means for switching between outflow to the external passage and a branch pipe connecting the external passage and an exhaust pipe downstream of the catalyst and having a check valve. Exhaust purification device.
【請求項2】 上記切換え手段が2方向切換え弁である
ことを特徴とする請求項1に記載のエンジンの排気浄化
装置。
2. The exhaust gas purifying apparatus for an engine according to claim 1, wherein the switching means is a two-way switching valve.
【請求項3】 上記切換え手段が、内部通路と内部通路
下流の排気管とを繋ぐカットバルブと、内部通路と外部
通路とを繋ぐカットバルブであることを特徴とする請求
項1に記載のエンジンの排気浄化装置。
3. The engine according to claim 1, wherein the switching means is a cut valve that connects the internal passage and an exhaust pipe downstream of the internal passage, and a cut valve that connects the internal passage and the external passage. Exhaust purification device.
JP2222093U 1993-04-27 1993-04-27 Engine exhaust purification device Pending JPH0680812U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2222093U JPH0680812U (en) 1993-04-27 1993-04-27 Engine exhaust purification device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2222093U JPH0680812U (en) 1993-04-27 1993-04-27 Engine exhaust purification device

Publications (1)

Publication Number Publication Date
JPH0680812U true JPH0680812U (en) 1994-11-15

Family

ID=12076720

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2222093U Pending JPH0680812U (en) 1993-04-27 1993-04-27 Engine exhaust purification device

Country Status (1)

Country Link
JP (1) JPH0680812U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015222050A (en) * 2014-05-23 2015-12-10 マツダ株式会社 Internal combustion engine exhaust system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015222050A (en) * 2014-05-23 2015-12-10 マツダ株式会社 Internal combustion engine exhaust system

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