JPH0422017Y2 - - Google Patents
Info
- Publication number
- JPH0422017Y2 JPH0422017Y2 JP17258986U JP17258986U JPH0422017Y2 JP H0422017 Y2 JPH0422017 Y2 JP H0422017Y2 JP 17258986 U JP17258986 U JP 17258986U JP 17258986 U JP17258986 U JP 17258986U JP H0422017 Y2 JPH0422017 Y2 JP H0422017Y2
- Authority
- JP
- Japan
- Prior art keywords
- back pressure
- heater
- exhaust
- exhaust gas
- measuring device
- 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
Links
- 239000000919 ceramic Substances 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 5
- 230000008929 regeneration Effects 0.000 claims description 3
- 238000011069 regeneration method Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案はデイーゼルエンジンの排気ガス浄化装
置に係り、より詳しくは、フイルタ再生可能なデ
イーゼル排気固形微粒子捕集装置における再生時
期検知用の背圧測定装置の背圧導入用口金構造に
関する。[Detailed description of the invention] [Field of industrial application] The present invention relates to an exhaust gas purification device for a diesel engine, and more specifically, to a back pressure for detecting regeneration timing in a diesel exhaust solid particulate collection device that can regenerate a filter. This invention relates to a structure of a cap for introducing back pressure into a measuring device.
従来のデイーゼルエンジンの排気ガス背圧測定
装置における背圧検出ポート（以下背圧ポートと
いう）の一例を第５図〜第６図に示す。第５図
は、背圧ポート３０の一部断面外観図で排気管１
０に取り付けられた状態を示し、第６図は第５図
の断面図である。背圧ポート３０は第５図に示す
ように排気管１０内の排気ガスＧの流れの中にそ
の口金部２０を突出させている。口金部２０では
中空円筒状のセラミツクヒーター２４が同時に排
気導入用の排気通路２２にもなり、その背圧取入
口２２ａはヒータ２４の先端にあり、直接排気ガ
スの流れに向いて開口し、その周囲は保護カバー
２６で覆われている。図中２５は外部電源よりヒ
ータ２４のプラス端子２１までを繋いでいるリー
ド線で、２８はセラミツクヒータ２４に続いて排
気通路２２を形成し、外部に背圧を誘導している
内管である。第６図の２７はセラミツクヒータ２
４を背圧ポート内で保持している保持金具で、ま
たヒータのマイナス電極２３の接地を行つてい
る。
An example of a back pressure detection port (hereinafter referred to as a back pressure port) in a conventional diesel engine exhaust gas back pressure measuring device is shown in FIGS. 5 and 6. FIG. 5 is a partial cross-sectional external view of the back pressure port 30 and the exhaust pipe 1.
6 is a sectional view of FIG. 5. The back pressure port 30 has its mouthpiece 20 protruding into the flow of exhaust gas G in the exhaust pipe 10, as shown in FIG. In the base portion 20, a hollow cylindrical ceramic heater 24 also serves as an exhaust passage 22 for introducing exhaust gas, and its back pressure intake port 22a is located at the tip of the heater 24 and opens directly toward the flow of exhaust gas. The surrounding area is covered with a protective cover 26. In the figure, 25 is a lead wire connecting an external power source to the positive terminal 21 of the heater 24, and 28 is an inner tube that forms an exhaust passage 22 following the ceramic heater 24 and induces back pressure to the outside. . 27 in Fig. 6 is the ceramic heater 2
The negative electrode 23 of the heater is also grounded by the holding metal fitting that holds 4 in the back pressure port.
上記の通り、背圧ポートの入口にヒータを設け
て排気通路内に侵入してきた排気微粒子を燃焼さ
せて排気通路のつまりをなくし、適正な背圧測定
ができるようにしている。 As described above, a heater is provided at the inlet of the back pressure port to burn exhaust particulates that have entered the exhaust passage, thereby eliminating clogging of the exhaust passage and enabling proper back pressure measurement.
〔考案が解決しようとする問題点〕
排気管内の圧力変動が急激に生じると（例えば
エンジンの空ふかしなどの場合）背圧ポートの内
部まですゝのような排気微粒子が混入し、入口に
設けたヒータでは完全に燃えないものが発生す
る。[Problem that the invention aims to solve] When pressure fluctuations in the exhaust pipe occur rapidly (for example, when the engine is revved up), exhaust particulates such as ゝ get into the back pressure port, and the Heaters generate things that cannot be completely burned.
これを防ぐために中空ヒータの中にフイルタを
入れてもよいが、これは構造が複雑であり、また
フイルタ部での圧力損失が大きくなる欠点があ
る。 In order to prevent this, a filter may be placed inside the hollow heater, but this has the drawback of a complicated structure and a large pressure loss at the filter portion.
上記の問題点を解決するために本考案において
は、排気背圧を導入する口金部における円筒状の
セラミツクヒータの排気ガス側の先端の開口部を
閉塞し、その側面を開口することを特徴とする。
In order to solve the above-mentioned problems, the present invention is characterized in that the opening at the end of the cylindrical ceramic heater on the exhaust gas side in the mouthpiece for introducing exhaust back pressure is closed, and the side surface thereof is opened. do.
また、必要に応じ、前記セラミツクヒータの側
面にトラツプ層を設け、また口金部開口部にしぼ
りを設けるものとする。 Further, if necessary, a trap layer may be provided on the side surface of the ceramic heater, and a restriction may be provided at the opening of the mouthpiece.
上記の構成により、ヒータの有効面積が大きく
なり、排気微粒子の燃焼性が向上し、また、排気
ガスが円筒状ヒータの側面に設けられた孔から背
圧ポート内に導入されるために排気微粒子の捕集
効率が良く、特に、トラツプ層を設けた場合に顕
著である。
With the above configuration, the effective area of the heater is increased, improving the combustibility of exhaust particulates, and since the exhaust gas is introduced into the back pressure port from the hole provided on the side of the cylindrical heater, the exhaust particulates are The trapping efficiency is good, especially when a trap layer is provided.
また、ヒータの開口部を側孔としたために流入
する排気の流れへの抵抗が大きくなり、全体の排
気微粒子の背圧ポート内への侵入量が少なくな
る。特に口金部の入口を狭くした場合には、これ
によるしぼり効果が大きい。 Furthermore, since the opening of the heater is formed as a side hole, resistance to the flow of incoming exhaust gas is increased, and the amount of the exhaust particles that enter the back pressure port is reduced overall. Particularly when the entrance of the mouthpiece is narrowed, this has a great squeezing effect.
本考案の第１実施例を第１図〜第２図に示す。
第１図は本考案による背圧ポートの口金部１の断
面図を示すもので、円筒状のセラミツクヒータ２
の排気ガス側に向いた先端を閉じて、この部分に
肉厚の閉塞部２ａを形成し、ヒータ２の側面を開
口して背圧取入れ口となる側孔３ａを設け、その
周囲を保護カバー４で覆つている。また、保持金
具５でセラミツクヒータ２を保持し、該保持金具
５は、ヒータ２のアースにもなつている。６はヒ
ータ２のプラス端子からのリード線である。１０
は背圧ポートを取付けた場合の排気管の位置を示
し、Ｇはそのときの排気ガスの流れを示す。
A first embodiment of the present invention is shown in FIGS. 1 and 2.
FIG. 1 shows a cross-sectional view of the mouthpiece 1 of the back pressure port according to the present invention, and shows a cylindrical ceramic heater 2.
The end facing the exhaust gas side is closed to form a thick closed part 2a in this part, the side of the heater 2 is opened to form a side hole 3a which serves as a back pressure intake, and a protective cover is placed around it. It is covered by 4. Further, the ceramic heater 2 is held by a holding metal fitting 5, and the holding metal fitting 5 also serves as a ground for the heater 2. 6 is a lead wire from the positive terminal of the heater 2. 10
indicates the position of the exhaust pipe when a back pressure port is installed, and G indicates the flow of exhaust gas at that time.
該セラミツクヒータ２は次のように形成されて
いる。第２図に示すように、アルミナグリーンシ
ート２″の上に白金（Pt）等でヒータパターン８
が印刷されており、また、ヒータの側孔の位置に
穴３a″があけられている。また中軸２′はアルミ
ナでできており、ヒータ側孔の位置に穴３a′があ
けられここまでは中空にしてある。中軸２′にシ
ート２″を重ね、穴３a′と３a″とが重なるように
してシート２″を中軸２′に巻きつけたあと一体焼
成してヒータ２の本体を構成する。ヒータ２と保
持金具５はメタライズ層により接合されヒータの
マイナス端子８ｂはシート２″にあけられた穴を
通して保持金具５と接触しアースされている。ヒ
ータのプラス端子８ａからはリード線６が引き出
されている。以上の構成よりなるヒータ２を第５
図〜第６図に示すような従来の方法で背圧センサ
ーとして組み付ける。 The ceramic heater 2 is formed as follows. As shown in Figure 2, a heater pattern 8 made of platinum (Pt) etc. is placed on the alumina green sheet 2''.
is printed, and a hole 3a'' is drilled at the position of the side hole of the heater.The center shaft 2' is made of alumina, and a hole 3a' is drilled at the position of the heater side hole. It is hollow.The sheet 2'' is stacked on the center shaft 2', and the sheet 2" is wrapped around the center shaft 2' so that the holes 3a' and 3a" overlap, and then fired as a unit to form the main body of the heater 2. . The heater 2 and the holding fitting 5 are joined by a metallized layer, and the negative terminal 8b of the heater contacts the holding fitting 5 through a hole drilled in the sheet 2'' and is grounded.A lead wire 6 is drawn out from the positive terminal 8a of the heater. The heater 2 having the above configuration is used as the fifth heater.
It is assembled as a back pressure sensor using the conventional method as shown in FIGS.
上記背圧取入れ口３ａの位置、大きさ、個数に
関しての制約はないが、排気微粒子の燃焼性との
かねあいと排気微粒子の排気通路３内への混入防
止の意味で発熱体の中央付近に３ミリメートル程
度のもの１個くらいがよい。 There are no restrictions on the position, size, or number of the back pressure intake ports 3a, but in consideration of the combustibility of exhaust particulates and to prevent exhaust particulates from entering the exhaust passage 3, the back pressure intake ports 3a should be placed near the center of the heating element. One piece of millimeter size is good.
上記の構成により、従来型では急激に多量の黒
煙排気微粒子が発生した場合に排気通路２２内に
深く侵入していた排気微粒子は、本考案によれば
背圧取入れ口の入口で一たん遮られて直接真直ぐ
に背圧ポート内部まで侵入することがなく、また
入口でのヒータ面の接触面積を広く、また閉塞部
２ａが肉厚でその熱容量も大きいために排気管よ
り入る排気微粒子を背圧ポートの入口付近にとど
めて有効にその燃焼を行うことができる。 With the above configuration, the exhaust particles that would have penetrated deeply into the exhaust passage 22 when a large amount of black smoke exhaust particles were suddenly generated in the conventional type are temporarily blocked at the entrance of the back pressure intake according to the present invention. Since the contact area of the heater surface at the inlet is wide, and the closed part 2a is thick and has a large heat capacity, it prevents exhaust particles from entering from the exhaust pipe. It is possible to effectively burn the fuel by keeping it near the inlet of the pressure port.
つぎに本考案の第２実施例を第３図に示す。本
実施例ではヒータ２の表面に排気微粒子のトラツ
プ層としてアルミナ等の粉末を９に示すように吹
き付けてある。このときのトラツプ層の厚さは50
〜100ミクロン、粒径は10〜100ミクロン程度のも
ので十分である。これによりトラツプ層の凹部に
排気微粒子を捕捉して背圧取入れ口より内部への
侵入を防ぎ、ヒータ２で焼却するのに有効であ
る。 Next, a second embodiment of the present invention is shown in FIG. In this embodiment, powder such as alumina is sprayed onto the surface of the heater 2 as shown in 9 as a trap layer for exhaust particulates. The thickness of the trap layer at this time is 50
~100 microns, and a particle size of about 10 to 100 microns is sufficient. This is effective in trapping exhaust particulates in the recesses of the trap layer, preventing them from entering the interior through the back pressure intake, and incinerating them with the heater 2.
本考案の第３実施例を第４図に示す。これはヒ
ータ２の保護カバー４の先端部４ａの開口面積を
小さくして侵入する排気ガスにしぼりを与えこれ
によつて排気微粒子の侵入を防いでいる。 A third embodiment of the present invention is shown in FIG. This reduces the opening area of the tip 4a of the protective cover 4 of the heater 2 to restrict the invading exhaust gas, thereby preventing the intrusion of exhaust particles.
本考案を実施することにより次のような効果が
ある。
By implementing the present invention, the following effects can be obtained.
(1) 同一のヒータ径でも有効面積が大きくなり排
気微粒子の燃焼性が向上する。(1) Even with the same heater diameter, the effective area becomes larger and the combustibility of exhaust particulates improves.
(2) 排気ガスが直接ヒータ内に入ることができ
ず、特にトラツプ層を付けた場合には、そのト
ラツプ層をかすめるようにして通るために、排
気微粒子の捕集効率がよい。(2) Exhaust gas cannot directly enter the heater; especially when a trap layer is attached, the exhaust gas passes by passing through the trap layer, which improves the efficiency of collecting exhaust particles.
(3) 開口部を側孔としたために流入する排気の流
れへの抵抗が大きくなり全体の排気微粒子の侵
入量が減る。特に口金部の入口を狭くした場合
にはしぼり効果が起りこの効果が大きい。(3) Since the opening is a side hole, the resistance to the flow of incoming exhaust gas increases, reducing the overall amount of intrusion of exhaust particles. In particular, when the entrance of the mouthpiece is narrowed, a squeezing effect occurs and this effect is significant.
(4) フイルタが不要である。(4) No filter is required.
(5) 内径を大きくしてフイルタを付けるよりも、
内径が同じで外にトラツプ層を付ける方が構造
的にも製作上もはるかに簡単である。(5) Rather than increasing the inner diameter and attaching a filter,
It is much simpler in terms of structure and production to have the same inner diameter and attach a trap layer to the outside.
(6) 従来型に比し、特にコストの上昇はない。(6) There is no particular increase in cost compared to the conventional type.
第１図は本考案の第１実施例を示す背圧ポート
の口金部周辺の部分断面図、第２図は第１図のヒ
ータの構造説明図、第３図はトラツプ層を取り付
けたヒータを有する本考案の第２実施例の断面
図、第４図は保護カバーの先端の開口面積を小さ
くした口金部を有する本考案の第３図実施例の部
分断面図、第５図は従来型の背圧ポートの一部断
面外観図、第６図は第５図の断面図を示す。
１……口金部、２……セラミツクヒータ、２′
……中軸、２″……アルミナグリーンシート、３
ａ……ヒータの側孔、４……保護カバー、５……
保持金具、１０……排気管、Ｇ……排気ガス。
Fig. 1 is a partial sectional view of the vicinity of the base of the back pressure port showing the first embodiment of the present invention, Fig. 2 is an explanatory diagram of the structure of the heater in Fig. 1, and Fig. 3 is a diagram showing the heater with a trap layer attached. 3 is a partial sectional view of the embodiment of the present invention, and FIG. 5 is a sectional view of the conventional type. A partially sectional external view of the back pressure port, FIG. 6 shows a sectional view of FIG. 5. 1... Base part, 2... Ceramic heater, 2'
...Central shaft, 2" ...Alumina green sheet, 3
a... Heater side hole, 4... Protective cover, 5...
Holding metal fitting, 10... Exhaust pipe, G... Exhaust gas.
Claims (1)
形微粒子捕集装置における再生時期検知用の背
圧測定装置の背圧検出ポートにおいて、 排気背圧を導入する口金部１における円筒状
のセラミツクヒータ２の排気ガスＧ側の先端開
口部を閉塞２ａし、その側面を開口３ａして背
圧取入れ口としたことを特徴とするデイーゼル
エンジンの排気ガス背圧測定装置の背圧検出ポ
ート構造。 ２ 前記口金部１のセラミツクヒータ２の側面に
トラツプ層９を設けたことを特徴とする実用新
案登録請求の範囲第１項記載のデイーゼルエン
ジンの排気ガス背圧測定装置の背圧検出ポート
構造。 ３ 前記口金部１の開口部にしぼり４ａを設けた
ことを特徴とする実用新案登録請求の範囲第１
項記載のデイーゼルエンジンの排気ガス背圧測
定装置の背圧検出ポート構造。[Scope of Claim for Utility Model Registration] 1. A cylindrical shape in the base part 1 for introducing exhaust back pressure in a back pressure detection port of a back pressure measuring device for detecting regeneration timing in a filter regeneration type exhaust solid particulate collector of a diesel engine. A back pressure detection port of an exhaust gas back pressure measuring device for a diesel engine, characterized in that a tip opening on the exhaust gas G side of a ceramic heater 2 is closed 2a, and a side surface thereof is opened 3a to serve as a back pressure intake port. structure. 2. A back pressure detection port structure for an exhaust gas back pressure measuring device for a diesel engine as claimed in claim 1, characterized in that a trap layer 9 is provided on the side surface of the ceramic heater 2 of the base portion 1. 3 Utility model registration claim 1 characterized in that the opening of the cap part 1 is provided with a restriction 4a.
Back pressure detection port structure of the diesel engine exhaust gas back pressure measuring device described in .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17258986U JPH0422017Y2 (en) | 1986-11-12 | 1986-11-12 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17258986U JPH0422017Y2 (en) | 1986-11-12 | 1986-11-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6378116U JPS6378116U (en) | 1988-05-24 |
| JPH0422017Y2 true JPH0422017Y2 (en) | 1992-05-20 |
Family
ID=31109264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17258986U Expired JPH0422017Y2 (en) | 1986-11-12 | 1986-11-12 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0422017Y2 (en) |
-
1986
- 1986-11-12 JP JP17258986U patent/JPH0422017Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6378116U (en) | 1988-05-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1192893A (en) | Catalyst for reducing the ignition temperature of diesel black | |
| CA1284955C (en) | Electrical ignition device for regeneration of a particulate trap | |
| US20120085146A1 (en) | Particulate matter detection sensor | |
| CN109209621A (en) | The exhaust system of internal combustion engine | |
| JPH0422017Y2 (en) | ||
| JPH0422016Y2 (en) | ||
| JPS6239247B2 (en) | ||
| JPS6058810U (en) | Exhaust particulate separator | |
| JPS6119755U (en) | Particulate accumulation amount sensor in exhaust gas | |
| JP3692606B2 (en) | Air-fuel ratio sensor | |
| JPS59170612U (en) | Diesel engine exhaust gas purification device | |
| JPS58202014A (en) | Apparatus for purifying fine particles in exhaust gas of internal-combustion engine | |
| JPH063140Y2 (en) | Back pressure port structure of exhaust gas back pressure measuring device | |
| JPH03293552A (en) | Gas density detector | |
| JPS6327056Y2 (en) | ||
| JPH0424092Y2 (en) | ||
| JPH0511291Y2 (en) | ||
| JPS6311294Y2 (en) | ||
| JPS57212315A (en) | Purification device of fine exhaust gas particle for diesel engine | |
| JPH0241578Y2 (en) | ||
| JPH0430329Y2 (en) | ||
| JPH0122894Y2 (en) | ||
| JPH0317223U (en) | ||
| JPS581149U (en) | Flue smoke mercury detection device | |
| JPH0424093Y2 (en) |