JPH0431616A - Exhaust gas catalytic device for internal combustion engine - Google Patents
Exhaust gas catalytic device for internal combustion engineInfo
- Publication number
- JPH0431616A JPH0431616A JP13770990A JP13770990A JPH0431616A JP H0431616 A JPH0431616 A JP H0431616A JP 13770990 A JP13770990 A JP 13770990A JP 13770990 A JP13770990 A JP 13770990A JP H0431616 A JPH0431616 A JP H0431616A
- Authority
- JP
- Japan
- Prior art keywords
- carrier
- catalyst
- exhaust
- temperature
- switch
- 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
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 11
- 230000003197 catalytic effect Effects 0.000 title claims 3
- 239000003054 catalyst Substances 0.000 claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims description 14
- 238000005485 electric heating Methods 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract 1
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 238000009877 rendering Methods 0.000 description 2
- 229910052703 rhodium Inorganic materials 0.000 description 2
- 239000010948 rhodium Substances 0.000 description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 2
- 239000000872 buffer Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は内燃機関の排気ガス中に含まれる未燃々料、有
害物質を酸化反応させ無害化する排気触媒装置に関する
。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an exhaust catalyst device that oxidizes unburned fuel and harmful substances contained in the exhaust gas of an internal combustion engine to render them harmless.
（従来の技術〕
内燃機関の排気触媒装置は第４図のように触媒の担体１
、（以下担体と略す）ケース２、排気管３より構成され
ている。触媒としてはパラジウム、ロジウム、白金等が
使用され図示しない内燃機関よりの排気ガスが排気触媒
装置に導入され触媒温度が２５０〜３００℃になると触
媒が排気ガス中に含まれる未燃々料、アルデヒド、ハイ
ドロカーボン等その他の有害物質に酸化、反応して無害
化する。(Prior art) An exhaust catalyst device for an internal combustion engine has a catalyst carrier 1 as shown in Fig. 4.
, a case 2 (hereinafter referred to as carrier), and an exhaust pipe 3. Palladium, rhodium, platinum, etc. are used as the catalyst. Exhaust gas from an internal combustion engine (not shown) is introduced into the exhaust catalyst device, and when the catalyst temperature reaches 250 to 300°C, the catalyst converts unburned fuel and aldehyde contained in the exhaust gas. , oxidizes and reacts with other harmful substances such as hydrocarbons, rendering them harmless.
このような従来の排気触媒装置においては触媒の温度が
２５０〜３００℃に達しないと触媒としての機能が発揮
できないので、排気ガス温度の低い内燃機関の始動直後
においては、排気ガス中の未燃々料、を書物質は浄化さ
れないまま大気中に排出されていたという問題がある。Such conventional exhaust catalyst devices cannot function as a catalyst unless the temperature of the catalyst reaches 250 to 300°C. There is a problem in that the materials used in this process are discharged into the atmosphere without being purified.
本発明はこれに鑑み、排気触媒装置の担体の外周を電熱
機で囲繞し、加熱すると共に更に排気管内に排気絞り弁
を設けて、始動時の触媒温度を上昇させる機構を提供し
て、上記の問題の解消を図る目的としてなされたもので
ある。In view of this, the present invention provides a mechanism in which the outer periphery of the carrier of the exhaust catalyst device is surrounded by an electric heater to heat it, and an exhaust throttle valve is further provided in the exhaust pipe to raise the catalyst temperature at the time of startup. This was done with the aim of solving the problem of.
上記目的を達するために本発明は、排気触媒装置の触媒
の担体の外周部を電熱材で囲繞し、機関の始動前に前記
電熱材に通電して担体を加熱する装置とし、更に電熱材
の加熱時間を制御するタイマスイッチを設け、該タイマ
スイッチの作動に連動して機関の始動スイッチを作動さ
せる制御機構を設けると共に、更に触媒装置の後方に連
接する排気管内に排気絞り弁を設け、前記機関の始動ス
イッチの作動に連動して排気絞り弁の開閉時間を制御す
るタイマスイッチを設けて、機関の始動時の触媒温度を
上昇させる構成とした。In order to achieve the above object, the present invention is a device that surrounds the outer periphery of a catalyst carrier of an exhaust catalyst device with an electric heating material, heats the carrier by applying electricity to the electric heating material before starting the engine, and A timer switch for controlling the heating time is provided, a control mechanism is provided for operating an engine start switch in conjunction with the operation of the timer switch, and an exhaust throttle valve is further provided in the exhaust pipe connected to the rear of the catalyst device. A timer switch is provided to control the opening/closing time of the exhaust throttle valve in conjunction with the operation of the engine start switch to increase the catalyst temperature when the engine is started.
上記の構成により担体を急速に昇温させることができる
ので、排気温度の低い始動時の排気ガス中の未燃々料、
有害物質などを効果的に浄化することができる。With the above configuration, the temperature of the carrier can be raised rapidly, so that unfueled fuel in the exhaust gas during startup when the exhaust temperature is low,
It can effectively purify harmful substances.
本発明の構成を第１〜第３に示す実施例に従って説明す
る。第１図において担体ｌは熱伝導の良いメタル製が好
しく、触媒としては公知のパラジウム、ロジウム、白金
などが使用される。The structure of the present invention will be explained according to the first to third embodiments. In FIG. 1, the carrier l is preferably made of a metal with good thermal conductivity, and the catalyst used is known palladium, rhodium, platinum, or the like.
電熱材４はケース２の外周を囲繞しており、セラミック
などの絶縁材５で被覆されている。電熱材４は第２図に
示すようにＮｉ−Ｃｒの線材４ｃと伝熱管４ａ内径部で
形成される中間部にセラミック粉末４ｂが充填されてい
る。第２図に示す実施例では線材４ｃとしたが板材であ
っても良い。排気管３は２示しないガスケットを介して
ケース２に締結されており、弁軸７により支持されてい
る排気絞り弁６は連結してい・るレバー８１ソレノイド
９により、この開閉が制御すれる。タイマスイッチ１０
は担体外周部の加熱時間を、タイマスイッチ１１は排気
絞り弁６の開閉時間をそれぞれＩ！御するものである。The electric heating material 4 surrounds the outer periphery of the case 2 and is covered with an insulating material 5 such as ceramic. As shown in FIG. 2, the electric heating material 4 is filled with ceramic powder 4b in the intermediate portion formed by the Ni--Cr wire 4c and the inner diameter portion of the heat transfer tube 4a. In the embodiment shown in FIG. 2, the wire rod 4c is used, but a plate material may also be used. The exhaust pipe 3 is connected to the case 2 via a gasket (not shown), and the opening and closing of the exhaust throttle valve 6 supported by the valve shaft 7 is controlled by a lever 81 and a solenoid 9 connected thereto. timer switch 10
is the heating time of the outer circumference of the carrier, and the timer switch 11 is the opening/closing time of the exhaust throttle valve 6, respectively. It is under your control.
リレー１３は担体外局部の加熱と始動スイッチ１２、排
気絞り弁６の作動を切換えるもので、接片１３ａ、：＋
イル１３ｂ１接点１３ｃ、１３ｄを含んでいる。The relay 13 switches between heating the external part of the carrier, the start switch 12, and the operation of the exhaust throttle valve 6, and has contact pieces 13a, :+
The coil 13b1 includes contacts 13c and 13d.
前記の各機器とバフテリ１４．始動スイッチ１２、スイ
ッチ１５は導線１６で結ばれ、本発明の触媒装置を構成
している。Each of the above-mentioned devices and buffers 14. The starting switch 12 and the switch 15 are connected by a conducting wire 16 and constitute the catalyst device of the present invention.
第３図は本発明と従来の場合の担体の温度Ｓと加熱時間
ｔとの関係を示すもので、曲線Ａは排気絞り弁を閉止し
た本発明の場合、曲線Ｂ（点線）は排気絞りのない従来
の場合、曲線Ｃは電熱材による加熱と、排気絞り弁によ
る加熱を組合せた本発明の場合で温度Ｓ、は触媒が酸化
反応する温度２５０〜３００℃を示している。Figure 3 shows the relationship between carrier temperature S and heating time t for the present invention and the conventional case. Curve A is for the present invention with the exhaust throttle valve closed, and curve B (dotted line) is for the exhaust throttle valve. In the conventional case, curve C shows the case of the present invention which combines heating by an electric heating material and heating by an exhaust throttle valve, and the temperature S indicates a temperature of 250 to 300° C. at which the catalyst undergoes an oxidation reaction.
本発明の機関の始動前加熱時間１．は機関の仕様によっ
て異なるが担体温度が６００〜８００℃になるようにき
める。また【、は機関の始動後排気絞り弁を閉止させた
場合の時間て一般に２〜３分程度必要である。（１，）
は排気絞りかない従来の場合の時間で５分前後と長くな
っている。つぎに作用を第１図、第３図にて説明する０
機関の始動前スイッチ１５をＯＮにするとバッテリ１４
よりの電流はタイマスイッチ１０を通り、リレー１３の
コイル１３ｂを励磁し接片１３ａは接点１３ｃを閉じる
ので、電熱材４は急速に加熱されて担体ｌが昇温する。Heating time before starting the engine of the present invention1. The carrier temperature is determined to be 600 to 800°C, although it varies depending on the specifications of the engine. In addition, it generally takes about 2 to 3 minutes to close the exhaust throttle valve after starting the engine. (1,)
The time taken in the conventional case without exhaust throttle is around 5 minutes, which is longer. Next, the action will be explained with reference to Figures 1 and 3.
When the engine pre-start switch 15 is turned on, the battery 14
The electric current passes through the timer switch 10, excites the coil 13b of the relay 13, and the contact piece 13a closes the contact 13c, so that the electric heating material 4 is rapidly heated and the temperature of the carrier 1 increases.
前記のように担体温度が６００〜８００℃になる所定の
加熱時間ｔ、を経過するとタイマスイッチ１０が切れコ
イル１３ｂも消磁するので、接片１３ａは接点１３ｃを
開いて担体１の加熱を中止し、接点１３ａを閉じ電流は
始動スイッチ１２をＯＮとして内燃機関を始動させる。As mentioned above, when the predetermined heating time t for the carrier temperature to reach 600 to 800°C has elapsed, the timer switch 10 is turned off and the coil 13b is also demagnetized, so the contact piece 13a opens the contact 13c and stops heating the carrier 1. , the contact 13a is closed and the current turns on the starting switch 12 to start the internal combustion engine.
同時にソレノイド９を作動させて排気絞り弁６を閉じ、
排気ガス温度を高めて担体１を加熱し触媒の温度Ｓ１が
２５０〜３００℃になる所定の加熱時間ｔ７、一般に２
〜３分を経過するとタイマスイッチ１１が切れて排気絞
り弁６が開き担体１の加熱作用は終了して、担体１は第
３図の曲線Ｃのような温度を維持できるので触媒は適正
な酸化反応を行うことができる。At the same time, operate the solenoid 9 to close the exhaust throttle valve 6,
A predetermined heating time t7, generally 2
When ~3 minutes have elapsed, the timer switch 11 is turned off and the exhaust throttle valve 6 is opened to complete the heating action of the carrier 1. Since the carrier 1 can maintain a temperature as shown by curve C in Figure 3, the catalyst is properly oxidized. reactions can be carried out.
本発明は以上のように排気触媒装置の機能を発揮させる
ために触媒の担体外局部を電熱材で囲繞して内燃機関の
始動前に通電加熱し、また始動後は可変排気絞りを作動
させて排気ガス温度を高め担体の昇温を図っているので
、きわめて短時間に触媒の機能回復、維持が可能であり
、排気温度の低い内燃機関の始動直後、排気ガス中に含
まれる未燃々料、アルデヒド、ハイドロカーボン等の有
害物質に触媒が有効に酸化反応して無害化することがで
きる。As described above, in order to exert the function of the exhaust catalyst device, the present invention surrounds the external part of the catalyst carrier with an electric heating material, heats it with electricity before starting the internal combustion engine, and operates the variable exhaust throttle after starting the internal combustion engine. By raising the temperature of the exhaust gas and increasing the temperature of the carrier, it is possible to recover and maintain the catalyst function in an extremely short period of time. The catalyst can effectively oxidize harmful substances such as aldehydes, hydrocarbons, etc., rendering them harmless.
このように本発明は公害防止のため優れた効果が期待で
きるのである。As described above, the present invention can be expected to have an excellent effect on preventing pollution.
第１図は本発明の実施例を示す排気触媒装置の全形図。
第２図は本発明の実施例を示す電熱材の詳細図。
第３図は本発明の実施例と従来の触媒の担体温度と加熱
時間を示す関係図。
第４図は従来の排気触媒装置の全形図である。
１・・・・・・・・・触媒の担体
２・・・・・・・・・ケース
４・・・・・・・・・−電熱材
６・・・・・・・・・排気絞り弁
９・・・ ・・・・・ ・ソレノイド
１０．１１・・・・・タイマスイッチ
１２・・・・・・・・始動スイッチ
１３・・・・・・・・リレー
１５・・・・・・・・スイッチFIG. 1 is an overall view of an exhaust catalyst device showing an embodiment of the present invention. FIG. 2 is a detailed diagram of an electric heating material showing an embodiment of the present invention. FIG. 3 is a relational diagram showing the carrier temperature and heating time of an example of the present invention and a conventional catalyst. FIG. 4 is an overall view of a conventional exhaust catalyst device. 1... Catalyst carrier 2... Case 4... - Electric heating material 6... Exhaust throttle valve 9...... Solenoid 10.11... Timer switch 12... Start switch 13... Relay 15... ·switch
Claims (3)
繞し、機関の始動前に前記電熱材に通電して担体を加熱
する構成としたことを特徴とする内燃機関の排気触媒装
置。(1) An exhaust catalytic device for an internal combustion engine, characterized in that the outer periphery of a catalyst carrier of the exhaust catalytic device is surrounded by an electric heating material, and the carrier is heated by applying electricity to the electric heating material before starting the engine. .
するタイマスイッチを設け、該タイマスイッチの作動に
連動して機関の始動スイッチを作動させる制御機構を設
けたことを特徴とする請求項（１）項の内燃機関の排気
触媒装置。(2) A claim characterized in that a timer switch is provided for controlling the heating time of the electric heating material on the outer periphery of the catalyst carrier, and a control mechanism is provided for operating an engine starting switch in conjunction with the operation of the timer switch. The exhaust catalyst device for an internal combustion engine according to item (1).
り弁を設け、前記機関の始動スイッチの作動に連動して
排気絞り弁の開閉時間を制御するタイマスイッチを設け
たことを特徴とする請求項（２）項の内燃機関の排気触
媒装置。(3) An exhaust throttle valve is provided in the exhaust pipe connected to the rear of the catalyst device, and a timer switch is provided for controlling the opening/closing time of the exhaust throttle valve in conjunction with the operation of the engine start switch. The exhaust catalyst device for an internal combustion engine according to claim (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13770990A JPH0431616A (en) | 1990-05-28 | 1990-05-28 | Exhaust gas catalytic device for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13770990A JPH0431616A (en) | 1990-05-28 | 1990-05-28 | Exhaust gas catalytic device for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0431616A true JPH0431616A (en) | 1992-02-03 |
Family
ID=15204992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13770990A Pending JPH0431616A (en) | 1990-05-28 | 1990-05-28 | Exhaust gas catalytic device for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0431616A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015178834A (en) * | 2014-03-19 | 2015-10-08 | エーバーシュペッヒャー・エグゾースト・テクノロジー・ゲーエムベーハー・ウント・コンパニー・カーゲー | Exhaust gas device |
-
1990
- 1990-05-28 JP JP13770990A patent/JPH0431616A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015178834A (en) * | 2014-03-19 | 2015-10-08 | エーバーシュペッヒャー・エグゾースト・テクノロジー・ゲーエムベーハー・ウント・コンパニー・カーゲー | Exhaust gas device |
| US9464558B2 (en) | 2014-03-19 | 2016-10-11 | Eberspächer Exhaust Technology GmbH & Co. KG | Heating device for an exhaust system |
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