JPH10184346A - Emission purifier for internal combustion engine - Google Patents

Emission purifier for internal combustion engine

Info

Publication number
JPH10184346A
JPH10184346A JP35830396A JP35830396A JPH10184346A JP H10184346 A JPH10184346 A JP H10184346A JP 35830396 A JP35830396 A JP 35830396A JP 35830396 A JP35830396 A JP 35830396A JP H10184346 A JPH10184346 A JP H10184346A
Authority
JP
Japan
Prior art keywords
exhaust gas
bypass passage
catalyst
temperature
passage
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
JP35830396A
Other languages
Japanese (ja)
Inventor
Kazuhiko Kanetoshi
和彦 兼利
Hirobumi Tsuchida
博文 土田
Akira Tayama
彰 田山
Keiji Okada
圭司 岡田
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.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP35830396A priority Critical patent/JPH10184346A/en
Publication of JPH10184346A publication Critical patent/JPH10184346A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0835—Hydrocarbons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • F01N3/0878—Bypassing absorbents or adsorbents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/10—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a heat accumulator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

PROBLEM TO BE SOLVED: To completely purify emission at the time of start of an engine. SOLUTION: A bypass passage 3 branching from a main passage 2 is provided with a regenerative material 9 for suppressing the temperature of emission, an absorbent 7 for trapping hydrocarbon of the emission and a catalyst 8 with a heater. Immediately after the start, the emission is guided to the bypass passage 3 by a selector valve 6, the hydrocarbon is trapped by the adsorbent 7 and the selector valve 6 is returned after a main catalyst 4 is activated to change to the main passage 2. When the catalyst 8 with a heater is turned on to obtain activating temperature, high temperature emission is introduced to the bypass passage 3 by the selector valve 6. The hydrocarbon is separated from the adsorbent 7 owing to the high temperature exhaust gas. On the other hand, at this time, the regenerative material 9 suppresses the temperature of the high temperature emission and supplies the emission to the adsorbent 7, so that the abrupt separation of the hydrocarbon from the adsorbent 7 is prevented and the the purifying treatment limit of the catalyst 8 with a heater is prevented from being exceeded.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、内燃機関（エンジ
ン）の排気ガスを浄化する排気浄化装置に関し、特に、
内燃機関の始動直後における排気ガス中に多く含まれる
炭化水素等の大気中への放出を高効率的に防止するよう
にした内燃機関の排気浄化装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas purifying apparatus for purifying exhaust gas of an internal combustion engine (engine).
The present invention relates to an exhaust gas purification device for an internal combustion engine, which efficiently prevents the release of hydrocarbons and the like contained in exhaust gas into the atmosphere immediately after the start of the internal combustion engine.

【０００２】[0002]

【従来の技術】従来、自動車のエンジンから排出される
排気ガスを浄化するためには、白金、ロジウム等の貴金
属やその他の金属を担持した触媒が使用される。この触
媒は、エンジンの排気通路に配置され、排気ガス中の未
燃成分である炭化水素ＨＣ、一酸化炭素ＣＯ、窒素酸化
物ＮＯｘ等を酸化又は還元することにより、排気ガスを
浄化する。このうち、特に炭化水素の触媒による浄化
は、排気温度による影響が大きく、触媒が活性化する温
度として、３００℃前後の温度が一般に必要とされる。2. Description of the Related Art Conventionally, in order to purify exhaust gas emitted from an automobile engine, a catalyst supporting a noble metal such as platinum and rhodium and other metals is used. The catalyst is disposed in an exhaust passage of the engine, and purifies the exhaust gas by oxidizing or reducing hydrocarbons HC, carbon monoxide CO, nitrogen oxide NOx, and the like, which are unburned components in the exhaust gas. Of these, in particular, the purification of hydrocarbons by a catalyst is greatly affected by the exhaust gas temperature, and a temperature around 300 ° C. is generally required as a temperature at which the catalyst is activated.

【０００３】従って、エンジン始動直後では、排気ガス
の温度が低く、触媒が活性化する温度（３００℃前後）
に達していないため、この触媒によっては炭化水素の浄
化はほとんど行われない。そのため炭化水素の大気中へ
の放出量が増大する結果となる。Therefore, immediately after the start of the engine, the temperature of the exhaust gas is low and the temperature at which the catalyst is activated (around 300 ° C.)
, The hydrocarbons are hardly purified by this catalyst. This results in an increased release of hydrocarbons into the atmosphere.

【０００４】このような問題を解決するための内燃機関
の排気浄化装置としては、特開平６−６６１３６号公報
に開示されているようなものが知られている。この排気
浄化装置は、エンジンからの排気ガスが流通されるメイ
ン通路に触媒（以下、メイン触媒という）を配置し、そ
の下流にバイパス通路を設け、このバイパス通路に吸着
剤と該吸着剤のさらに下流側にヒータ付き触媒を配設し
て構成されている。As an exhaust gas purifying apparatus for an internal combustion engine for solving such a problem, there is known an apparatus disclosed in Japanese Patent Application Laid-Open No. 6-66136. In this exhaust gas purification apparatus, a catalyst (hereinafter, referred to as a main catalyst) is disposed in a main passage through which exhaust gas from an engine flows, and a bypass passage is provided downstream of the catalyst. A catalyst with a heater is provided on the downstream side.

【０００５】メイン通路とバイパス通路の分岐部には、
エンジンからの排気ガスをメイン通路のさらに下流側ま
たはバイパス通路に選択的に導くための切替バルブ、お
よび排気ガスの温度を検出する排気温度センサが設けら
れている。この排気温度センサにより検出された排気温
度から、メイン触媒が活性化したか否かが判断され、切
替バルブが操作される。[0005] At the branch of the main passage and the bypass passage,
A switching valve for selectively guiding exhaust gas from the engine further downstream of the main passage or to a bypass passage, and an exhaust temperature sensor for detecting the temperature of the exhaust gas are provided. From the exhaust gas temperature detected by the exhaust gas temperature sensor, it is determined whether or not the main catalyst has been activated, and the switching valve is operated.

【０００６】エンジン始動直後においては、切替バルブ
によりバイパス通路に排気ガスを導き、吸着剤に炭化水
素をトラップ（吸着）させ、メイン触媒が活性化した後
に切替バルブを作動させてメイン通路の分岐部よりも下
流側に排気ガスを導くとともに、ヒータ付き触媒に通電
し活性温度に高め、その後再度切替バルブを作動させて
高温となった排気ガスをバイパス通路に導く。これによ
り、吸着剤にトラップされていた炭化水素が吸着剤から
脱離され、活性温度に達したヒータ付き触媒で浄化され
る。Immediately after the start of the engine, the switching valve guides exhaust gas to the bypass passage, traps (adsorbs) hydrocarbons in the adsorbent, activates the switching valve after the main catalyst is activated, and operates the switching valve to branch off the main passage. The exhaust gas is guided further downstream, and the catalyst with a heater is energized to increase the activation temperature, and then the switching valve is operated again to guide the high-temperature exhaust gas to the bypass passage. Thus, the hydrocarbons trapped in the adsorbent are desorbed from the adsorbent and purified by the heater-equipped catalyst that has reached the activation temperature.

【０００７】[0007]

【発明が解決しようとする課題】このように、上記従来
の排気浄化装置においては、吸着剤から炭化水素を脱離
するため、切替バルブを操作し、メイン触媒で浄化され
た高温の排気ガス（約４００℃）をバイパス通路側に流
入させ、これにより、吸着剤が昇温され炭化水素の脱離
が行われ、脱離された炭化水素を吸着剤の下流にあるヒ
ータ付き触媒によって浄化するようにしている。As described above, in the above-mentioned conventional exhaust gas purifying apparatus, the switching valve is operated in order to desorb hydrocarbons from the adsorbent, and the high-temperature exhaust gas (purified by the main catalyst) is operated. (About 400 ° C.) flows into the bypass passage side, whereby the adsorbent is heated to desorb hydrocarbons, and the desorbed hydrocarbons are purified by a catalyst with a heater downstream of the adsorbent. I have to.

【０００８】しかしながら、図５に示されるように、吸
着剤がトラップしている炭化水素の脱離量は、吸着剤の
入口温度により変化し、同図中に符号Ａで示されるよう
に、ある温度を超えると、脱離量は急激に上昇する。た
とえば、ゼオライト系では約２００℃で急激な脱離が行
われる一方、ヒータ付き触媒は活性化のためにヒータに
供給される電力は電力供給系により制限されるため、昇
温される触媒の容量は小容量となる。したがって、図５
に点線で示されているように、ヒータ付き触媒の浄化処
理能力には限界がある。However, as shown in FIG. 5, the amount of desorbed hydrocarbons trapped by the adsorbent changes depending on the inlet temperature of the adsorbent. Above the temperature, the desorption increases sharply. For example, in a zeolite system, rapid desorption occurs at about 200 ° C., whereas in a catalyst with a heater, the power supplied to the heater for activation is limited by the power supply system, so the capacity of the catalyst to be heated is increased. Is small. Therefore, FIG.
As shown by the dotted line in FIG.

【０００９】図６には時間の経過に伴う炭化水素の脱離
量と吸着剤の入口温度の関係が示されている。同図から
明らかなように、ある温度範囲では炭化水素は急激に脱
離されてしまうため、同図中に斜線で示されている部分
において、ヒータ付き触媒の処理限界を越えてしまい、
ヒータ付き触媒では処理できなくなり、その結果、炭化
水素の浄化を十分に行えない場合があるという問題があ
った。FIG. 6 shows the relationship between the amount of hydrocarbon desorbed over time and the inlet temperature of the adsorbent. As is apparent from the figure, hydrocarbons are rapidly desorbed in a certain temperature range, so that the processing range of the heater-equipped catalyst is exceeded in the hatched portion in the figure,
A catalyst with a heater cannot be processed, and as a result, there has been a problem that hydrocarbons may not be sufficiently purified.

【００１０】本発明は、このような従来技術の問題点に
鑑みてなされたものであり、炭化水素等の除去対象成分
を高効率的に除去し、排気ガスの浄化を十分に行えるよ
うにした内燃機関の排気浄化装置を提供することを目的
とする。The present invention has been made in view of such problems of the prior art, and has been designed to efficiently remove components to be removed such as hydrocarbons and to sufficiently purify exhaust gas. An object of the present invention is to provide an exhaust gas purification device for an internal combustion engine.

【００１１】なお、吸着剤の冷却装置を有する従来技術
として、特開平７−１３９３４３号公報には、内燃機関
の始動直後の炭化水素の吸着を確実に行うために吸着剤
を冷却媒体で冷却するものが開示されているが、この技
術は脱離時に冷却を行うものではなく、急激な炭化水素
の脱離を抑制するものではない。また、冷却媒体がエン
ジン冷却水等であるため配管や制御機構が複雑であり、
装置が大型化するという問題がある。As a prior art having a cooling device for the adsorbent, Japanese Patent Application Laid-Open No. 7-139343 discloses that the adsorbent is cooled with a cooling medium in order to surely adsorb hydrocarbons immediately after the start of the internal combustion engine. However, this technique does not perform cooling at the time of desorption, and does not suppress rapid desorption of hydrocarbons. Also, since the cooling medium is engine cooling water, piping and control mechanisms are complicated,
There is a problem that the device becomes large.

【００１２】[0012]

【課題を解決するための手段】上記目的を達成するた
め、請求項１記載の本発明の内燃機関の排気浄化装置
は、内燃機関の排気通路に設けられた第１触媒手段と、
該第１触媒手段の下流側で該排気通路から分岐するバイ
パス通路と、該バイパス通路に設けられた該バイパス通
路を流通する排気の除去対象成分を吸着する吸着手段
と、該バイパス通路の該吸着手段よりも下流側に設けら
れた加熱機能を有する第２触媒手段と、該バイパス通路
の該吸着手段よりも上流側に設けられた該バイパス通路
を流通する排気の温度を抑制する蓄熱手段と、該排気通
路と該バイパス通路との分岐部に設けられ、所定の運転
状態にあるときに排気を該バイパス通路側に導く開閉弁
と、を備えたことを特徴とする。According to a first aspect of the present invention, there is provided an exhaust gas purifying apparatus for an internal combustion engine, comprising: first catalytic means provided in an exhaust passage of the internal combustion engine;
A bypass passage branched from the exhaust passage at a downstream side of the first catalyst unit; an adsorption unit provided in the bypass passage for adsorbing a component to be removed of exhaust flowing through the bypass passage; and an adsorption unit for adsorbing the bypass passage. Second catalyst means having a heating function provided downstream of the means, and heat storage means for suppressing the temperature of exhaust gas flowing through the bypass passage provided upstream of the adsorption means of the bypass passage, An opening / closing valve provided at a branch portion between the exhaust passage and the bypass passage to guide exhaust gas to the bypass passage side in a predetermined operation state.

【００１３】請求項１記載の本発明の内燃機関の排気浄
化装置によると、バイパス通路の吸着手段よりも上流側
に蓄熱手段を設けており、この蓄熱手段は、吸着手段に
トラップされている炭化水素等の除去対象成分を脱離さ
せるためにバイパス通路に、高温の排気を導入した場合
に、この高温の排気の温度を抑制して吸着手段に導く作
用をなし、このため、吸着手段からの該除去対象成分の
急激な脱離が抑制され、その下流に存在する加熱機能を
有する第２触媒手段の処理能力を超えることが少なくな
り、排気の十分な浄化を行うことができるようになる。According to the exhaust gas purifying apparatus for an internal combustion engine according to the first aspect of the present invention, the heat storage means is provided on the upstream side of the adsorption means in the bypass passage, and the heat storage means is provided with the carbonization trapped in the adsorption means. When high-temperature exhaust gas is introduced into the bypass passage in order to desorb a component to be removed such as hydrogen, an action of suppressing the temperature of the high-temperature exhaust gas and guiding it to the adsorption means is performed. Abrupt desorption of the component to be removed is suppressed, and the processing capacity of the second catalyst means having a heating function existing downstream thereof is less likely to be exceeded, so that exhaust gas can be sufficiently purified.

【００１４】また、請求項２記載の本発明の内燃機関の
排気浄化装置は、請求項１記載の内燃機関の排気浄化装
置において、前記蓄熱手段は潜熱型であることを特徴と
する。According to a second aspect of the present invention, there is provided an exhaust gas purification apparatus for an internal combustion engine according to the first aspect, wherein the heat storage means is a latent heat type.

【００１５】請求項２記載の本発明の内燃機関の排気浄
化装置によると、蓄熱手段を潜熱型としており、潜熱型
は所定の条件下では流入する排気の温度にかかわらず、
流出する排気の温度を該流入する排気の温度よりも低い
温度で、ほぼ一定に保つことが可能であるとともに、エ
ネルギ密度が大きく、構成も簡単にできるので、装置構
成をそれほど複雑化することなく、高効率的に排気の浄
化を行うことができるようになる。According to the exhaust gas purifying apparatus for an internal combustion engine according to the second aspect of the present invention, the heat storage means is of a latent heat type.
The temperature of the exhaust gas flowing out can be kept substantially constant at a temperature lower than the temperature of the exhaust gas flowing in, and the energy density is large and the configuration can be simplified, so that the device configuration is not so complicated. Thus, the exhaust gas can be purified with high efficiency.

【００１６】[0016]

【発明の効果】請求項１記載の本発明の内燃機関の排気
浄化装置によると、排気中に含まれる炭化水素等の除去
対象成分を高効率的に除去することができ、排気ガスの
浄化を十分に行える内燃機関の排気浄化装置が提供され
るという効果がある。According to the exhaust gas purifying apparatus for an internal combustion engine according to the present invention, components to be removed such as hydrocarbons contained in exhaust gas can be efficiently removed, and purification of exhaust gas can be performed. There is an effect that an exhaust gas purification device for an internal combustion engine that can be sufficiently performed is provided.

【００１７】また、請求項２記載の本発明の内燃機関の
排気浄化装置によると、吸着手段へ導く排気ガスの温度
制御が容易であるとともに、構成をそれほど複雑化する
ことなく、排気中の炭化水素等の除去対象成分の除去を
高効率的に行えるようにした内燃機関の排気浄化装置が
提供されるという効果がある。Further, according to the exhaust gas purifying apparatus for an internal combustion engine of the present invention, it is easy to control the temperature of the exhaust gas guided to the adsorbing means, and the carbonization in the exhaust gas is not so complicated. There is an effect that an exhaust gas purifying apparatus for an internal combustion engine is provided which is capable of efficiently removing components to be removed such as hydrogen.

【００１８】[0018]

【発明の実施の形態】以下、本発明の実施の形態を図面
を参照して詳細に説明する。図１は本発明の実施の形態
に係る内燃機関（エンジン）の排気浄化装置の構成の概
要を示す図である。Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing an outline of a configuration of an exhaust gas purification apparatus for an internal combustion engine (engine) according to an embodiment of the present invention.

【００１９】同図において、１はエンジンを示してい
る。２はエンジン１の排気ポートにその一端が接続され
た排気通路としてのメイン通路であり、メイン通路２の
下流側（エンジン１の排気ポートに対して逆側）にはメ
イン通路２から分岐されるとともに、さらに下流側でメ
イン通路２に合流されるバイパス通路３が設けられてい
る。In FIG. 1, reference numeral 1 denotes an engine. Reference numeral 2 denotes a main passage as an exhaust passage whose one end is connected to an exhaust port of the engine 1, and is branched from the main passage 2 on the downstream side of the main passage 2 (the side opposite to the exhaust port of the engine 1). In addition, a bypass passage 3 that joins the main passage 2 further downstream is provided.

【００２０】メイン通路２のバイパス通路３との分岐部
よりも上流側には、メイン触媒（第１触媒手段）４が設
けられている。メイン通路２のメイン触媒４よりも下流
側でバイパス通路３との分岐部よりも上流側の部分に
は、この部分を流通する排気ガスの温度を検出する排気
温度センサ５が設けられている。メイン通路２とバイパ
ス通路３との分岐部には、メイン通路２の該分岐部より
も上流側を流通される排気ガスをメイン通路２の該分岐
部よりも下流側に流通させるか、またはバイパス通路に
流通させるかを選択的に切り替える切替バルブ（開閉
弁）６が設けられている。A main catalyst (first catalyst means) 4 is provided upstream of the branch of the main passage 2 with the bypass passage 3. An exhaust temperature sensor 5 for detecting a temperature of exhaust gas flowing through this portion of the main passage 2 downstream of the main catalyst 4 and upstream of a branch portion with the bypass passage 3 is provided. In the branch between the main passage 2 and the bypass passage 3, exhaust gas flowing upstream of the branch of the main passage 2 is caused to flow downstream of the branch of the main passage 2, or A switching valve (opening / closing valve) 6 for selectively switching whether to flow through the passage is provided.

【００２１】メイン通路２に分岐して並列的に設けられ
たバイパス通路３には、吸着剤（吸着手段）７が設けら
れている。吸着剤７の型としてはペレット、フォーム、
ハニカム等のいずれでもよい。An adsorbent (adsorbing means) 7 is provided in the bypass passage 3 branched in parallel with the main passage 2 and provided in parallel. The types of the adsorbent 7 are pellets, foams,
Any of a honeycomb or the like may be used.

【００２２】バイパス通路３の吸着剤７の下流側には、
図示しない電源回路からの電源の供給を受けて発熱する
ヒータを有するヒータ付き触媒（第２触媒手段）８が設
けられている。ヒータ付き触媒８に担持される触媒は、
三元触媒、酸化触媒のいずれでもよい。On the downstream side of the adsorbent 7 in the bypass passage 3,
A heater-equipped catalyst (second catalyst means) 8 having a heater that generates heat when supplied with power from a power supply circuit (not shown) is provided. The catalyst supported on the heater-equipped catalyst 8 is:
Either a three-way catalyst or an oxidation catalyst may be used.

【００２３】パイパス通路３の吸着剤７の上流側には、
蓄熱材（蓄熱手段）９が配置されている。この蓄熱材９
としては、顕熱型、潜熱型、反応型等の各種の方式のい
ずれかを採用することができる。On the upstream side of the adsorbent 7 in the bypass passage 3,
A heat storage material (heat storage means) 9 is provided. This heat storage material 9
Any of various methods such as a sensible heat type, a latent heat type, and a reaction type can be adopted.

【００２４】ここで、顕熱型は温度上昇を利用するもの
であり、蓄熱量が〔比熱×温度〕で表され、エネルギ密
度は小さいが取り扱いが容易であるという得失を有す
る。潜熱型は相転移、融解の潜熱を利用するものであ
り、一定温度で熱の出し入れができ、顕熱型よりもエネ
ルギ密度が大きく、構成を簡単にできるという利点を有
している。反応型は可逆反応に伴う吸発熱現象を利用し
たものであり、長期間の蓄熱が可能であるという利点を
有しているが、熱媒体搬送動力装置等が必要であり装置
が複雑になるという欠点がある。Here, the sensible heat type utilizes the rise in temperature, and has the advantage and disadvantage that the heat storage amount is represented by [specific heat × temperature] and the energy density is small but easy to handle. The latent heat type utilizes the latent heat of phase transition and melting, has the advantage that heat can be taken in and out at a constant temperature, the energy density is higher than that of the sensible heat type, and the structure can be simplified. The reaction type uses the phenomenon of heat absorption and exotherm accompanying the reversible reaction, and has the advantage of being able to store heat for a long period of time. There are drawbacks.

【００２５】このような蓄熱材の各方式における原理、
特徴を考慮すると、排気温度を一定の温度以下に抑制で
き、構成が簡単であるという特徴を有する潜熱型がもっ
とも有効であり適している。The principle of each type of such heat storage material,
Considering the features, the latent heat type, which has the feature that the exhaust gas temperature can be suppressed to a certain temperature or lower and the configuration is simple, is the most effective and suitable.

【００２６】また、この排気浄化装置は、バイパス通路
３の蓄熱材９のさらに上流側に２次空気を導入するため
のエアポンプ１１と該エアポンプ１１による２次空気の
導入又は停止を選択的に行うための２次空気切替バルブ
１０を備えている。但し、２次空気の導入位置はヒータ
付き触媒８の上流側で且つメイン通路２のメイン触媒４
の下流側であれば他の位置でも良い。This exhaust gas purifying apparatus selectively performs an air pump 11 for introducing secondary air further upstream of the heat storage material 9 in the bypass passage 3 and the introduction or stop of the secondary air by the air pump 11. Air switching valve 10 is provided. However, the introduction position of the secondary air is on the upstream side of the heater-equipped catalyst 8 and the main catalyst 4 in the main passage 2.
Any other position may be used as long as it is on the downstream side of.

【００２７】メイン通路２とバイパス通路３の分岐部に
配置された切替バルブ６は、図示しない制御回路（ＥＣ
Ｕ）によって制御されるアクチュエータにより切替えら
れ、メイン通路２の該分岐部よりも上流側の排気ガス流
を、メイン通路２の該分岐部よりも下流側に、またはバ
イパス通路３に導入する。The switching valve 6 disposed at the branch of the main passage 2 and the bypass passage 3 is connected to a control circuit (EC) (not shown).
The flow is switched by an actuator controlled by U), and the exhaust gas flow upstream of the branch of the main passage 2 is introduced downstream of the branch of the main passage 2 or into the bypass passage 3.

【００２８】また、エンジン１から排出された排気ガス
の温度は、排気温度センサ５により検出され、この排気
温度センサ５により検出された排気温度についての電気
信号が該制御回路に入力され、該制御回路からの出力信
号によってヒータ付き触媒８のヒータの作動、切替バル
ブ６の作動、２次空気切替バルブ１０の作動等が制御さ
れるようになっている。The temperature of the exhaust gas discharged from the engine 1 is detected by an exhaust temperature sensor 5, and an electric signal about the exhaust temperature detected by the exhaust temperature sensor 5 is input to the control circuit. The operation of the heater of the catalyst with heater 8, the operation of the switching valve 6, the operation of the secondary air switching valve 10, and the like are controlled by an output signal from the circuit.

【００２９】ここで、図２を参照して、蓄熱材９の詳細
について説明することにする。蓄熱材９は、蓄熱筒１２
の中に潜熱型の蓄熱材料が封入された蓄熱カプセル１３
を熱交換通路を形成するように排気ガス流に対して平行
となるように収容して構成されている。蓄熱カプセル１
３の断面形状は、この実施の形態では長楕円形をしたも
のを採用しているが、円形等でもよい。Here, the details of the heat storage material 9 will be described with reference to FIG. The heat storage material 9 is a heat storage cylinder 12
Heat storage capsule 13 in which a latent heat type heat storage material is enclosed
Are arranged so as to be parallel to the exhaust gas flow so as to form a heat exchange passage. Thermal storage capsule 1
In this embodiment, the cross-sectional shape of 3 is an elliptical shape, but may be a circle or the like.

【００３０】蓄熱材料は吸着剤７の種類により選定する
必要がある。例えば、蓄熱材料としては、相転移点が１
００℃以下であれば、ナフタリンやステアリン酸等を採
用することができる。相転移点が１００℃前後では高密
度ポリエチレン等を採用することができ、２００℃付近
ではＮａＯＨ−ＫＯＨ，ペンタエリトリトール等を採用
することができる。封入される蓄熱材料の量は脱離量を
考慮し、あらかじめ適量に設定される。The heat storage material needs to be selected according to the type of the adsorbent 7. For example, as a heat storage material, the phase transition point is 1
If the temperature is not higher than 00 ° C., naphthalene, stearic acid or the like can be employed. When the phase transition point is around 100 ° C., high-density polyethylene or the like can be adopted, and at around 200 ° C., NaOH-KOH, pentaerythritol or the like can be adopted. The amount of the heat storage material to be enclosed is set to an appropriate amount in advance in consideration of the desorption amount.

【００３１】エンジン１の排気通路としてのメイン通路
２に設けられたメイン触媒４は、エンジン１の定常運転
状態では必要な温度になっており、十分に活性化してい
るので、排気ガス中の炭化水素等を酸化、あるいは還元
して無害化する能力を持っている。従って、切替バルブ
６は定常運転状態では、エンジン１からの排気ガスをメ
イン通路２の該分岐部よりも下流側に導入するように設
定されている。The main catalyst 4 provided in the main passage 2 serving as the exhaust passage of the engine 1 has a required temperature in a steady operation state of the engine 1 and is sufficiently activated. It has the ability to oxidize or reduce hydrogen and the like to render them harmless. Therefore, the switching valve 6 is set to introduce exhaust gas from the engine 1 downstream of the branch portion of the main passage 2 in a steady operation state.

【００３２】一方、エンジン１の始動直後においては、
エンジン１は炭化水素を比較的多量に放出する傾向があ
るのに対し、メイン触媒４の温度が低く十分に炭化水素
を浄化することができない。そこで、切替バルブ６によ
りバイパス通路３側に排気ガスを流し、炭化水素を吸着
剤７に吸着させる。On the other hand, immediately after the start of the engine 1,
While the engine 1 tends to emit a relatively large amount of hydrocarbons, the temperature of the main catalyst 4 is so low that the hydrocarbons cannot be sufficiently purified. Therefore, the exhaust gas is caused to flow toward the bypass passage 3 by the switching valve 6 so that the hydrocarbon is adsorbed by the adsorbent 7.

【００３３】メイン通路２のメイン触媒４が活性化した
時点で、即ち排気温度センサ５により検出された温度
が、予め設定された所定の温度よりも高くなった時点
で、切替バルブ６を作動させて、バイパス通路３に流し
ていた排気ガスをメイン通路２の該分岐部の下流側に流
す。これと前後して、ヒータ付き触媒８のヒータに通電
して該触媒の温度を高め、該触媒を活性化させる。When the main catalyst 4 in the main passage 2 is activated, that is, when the temperature detected by the exhaust gas temperature sensor 5 becomes higher than a predetermined temperature, the switching valve 6 is operated. Thus, the exhaust gas flowing through the bypass passage 3 flows downstream of the branch portion of the main passage 2. Before or after this, the heater of the heater-equipped catalyst 8 is energized to increase the temperature of the catalyst and activate the catalyst.

【００３４】その後、再度切替バルブ６を作動させて、
排気ガスを再度バイパス通路３に導き、吸着剤７にトラ
ップされていた炭化水素を脱離させる。このとき、バイ
パス通路３には高温の排気ガス（約４００℃）が流れ込
むが、蓄熱材９と排気ガスとの間で熱交換が行われる。After that, the switching valve 6 is operated again,
The exhaust gas is guided again to the bypass passage 3 to desorb hydrocarbons trapped in the adsorbent 7. At this time, high-temperature exhaust gas (about 400 ° C.) flows into the bypass passage 3, but heat exchange is performed between the heat storage material 9 and the exhaust gas.

【００３５】熱交換が進行し、蓄熱材９が所定温度にな
ると相変化を起こしながら熱を吸収し、その下流側にあ
る吸着剤７にほぼ一定の温度（蓄熱材料が相変化を起こ
す所定の温度付近の温度）の排気ガスが供給される。そ
の結果、急激な炭化水素の脱離を押さえることができ、
小容量なヒータ付き触媒８で排気ガスを完全に浄化する
ことができる。When heat exchange progresses and the heat storage material 9 reaches a predetermined temperature, the heat storage material 9 absorbs heat while causing a phase change, and the adsorbent 7 on the downstream side has a substantially constant temperature (a predetermined temperature at which the heat storage material undergoes a phase change). (Temperature near the temperature). As a result, rapid desorption of hydrocarbons can be suppressed,
Exhaust gas can be completely purified by the small-capacity catalyst with heater 8.

【００３６】なお、エアポンプ１１と２次空気切替バル
ブ１０による２次空気のバイパス通路３への導入は、吸
着剤７に炭化水素を吸着させた後、炭化水素を脱離させ
るために高温の排気ガスをバイパス通路３に導入したと
きに行われる。これは、吸着剤７から脱離した炭化水素
とともに、酸素をヒータ付き触媒８へ供給することによ
り、ヒータ付き触媒８による炭化水素の浄化をさらに促
進するためである。The introduction of the secondary air into the bypass passage 3 by the air pump 11 and the secondary air switching valve 10 is performed by adsorbing the hydrocarbon on the adsorbent 7 and then exhausting the high-temperature exhaust gas in order to desorb the hydrocarbon. This is performed when gas is introduced into the bypass passage 3. This is because oxygen is supplied to the catalyst 8 with the heater together with the hydrocarbon desorbed from the adsorbent 7 to further promote purification of the hydrocarbon by the catalyst 8 with the heater.

【００３７】また、切替バルブ６等の作動制御は、必ず
しも排気温度センサ５の出力によって行う必要はなく、
排気温度を推定できるもの、例えば、エンジン始動から
の経過時間によって制御するようにしてもよい。It is not always necessary to control the operation of the switching valve 6 and the like based on the output of the exhaust gas temperature sensor 5.
The exhaust gas temperature may be estimated, for example, the control may be performed based on the elapsed time from the start of the engine.

【００３８】図３は、本発明の実施形態の効果を説明す
るための図である。吸着剤７から炭化水素を脱離させる
ため、切替バルブ６をバイパス通路３側に切替えると、
バイパス通路３には高温の排気ガス（約４００℃）が流
れ込む。この時の吸着剤入口温度の時間変化を、図３の
上段のグラフに示している。FIG. 3 is a diagram for explaining the effect of the embodiment of the present invention. When the switching valve 6 is switched to the bypass passage 3 side in order to desorb hydrocarbons from the adsorbent 7,
High-temperature exhaust gas (about 400 ° C.) flows into the bypass passage 3. The time change of the adsorbent inlet temperature at this time is shown in the upper graph of FIG.

【００３９】バイパス通路３側に流れ込んだ排気ガスと
蓄熱材９内に組み込まれた蓄熱カプセル１３との間で熱
交換が行われる。熱交換が進み蓄熱カプセル１３内の蓄
熱材料は所定温度になると、潜熱型の蓄熱材料では相変
化を起こしながら熱を吸収するため、相変化を起こす温
度（ここでは２００℃以下）で排気ガス温度は、ほぼ一
定に保たれ、吸着剤７に流入することになる。Heat exchange is performed between the exhaust gas flowing into the bypass passage 3 and the heat storage capsule 13 incorporated in the heat storage material 9. When heat exchange progresses and the heat storage material in the heat storage capsule 13 reaches a predetermined temperature, the latent heat type heat storage material absorbs heat while causing a phase change, so that the exhaust gas temperature is 200 ° C. or less at which the phase change occurs. Is kept substantially constant and flows into the adsorbent 7.

【００４０】その結果、図３の下段のグラフにおいて、
太実線で示すように炭化水素の脱離量が一定量以上には
ならなくなり、即ち、ヒータ付き触媒８の処理限界（同
図中、点線で示されている）を越えてしまうことがなく
なり、ヒータ付き触媒８で十分浄化ができるようにな
る。As a result, in the lower graph of FIG.
As shown by the bold solid line, the amount of desorbed hydrocarbons does not exceed a certain amount, that is, does not exceed the processing limit of the catalyst 8 with a heater (indicated by a dotted line in the figure), The catalyst with heater 8 can sufficiently purify the catalyst.

【００４１】図４は上述した本実施形態の一部の構成を
変更した例を示しており、独立的に設けられた蓄熱材９
は廃止して、吸着剤７が収容される吸着筒１４の内部に
蓄熱材をも収容したものである。即ち、吸着剤７の吸着
筒１４には、蓄熱材料が封入された蓄熱カプセル１３′
が直接的に埋め込まれている。このような構成を採用す
ることにより、本発明を適用したとしても従来の技術と
比較して装置を大型化することがない。なお、蓄熱材９
との熱交換を考慮し、吸着剤７の型としてはメタルハニ
カムを用いている。FIG. 4 shows an example in which a part of the configuration of the above-described embodiment is changed, and a heat storage material 9 provided independently is provided.
Is abolished, and a heat storage material is also accommodated inside the adsorption cylinder 14 in which the adsorbent 7 is accommodated. That is, the heat storage capsule 13 ′ in which the heat storage material is sealed is placed in the adsorption cylinder 14 of the adsorbent 7.
Is directly embedded. By adopting such a configuration, even when the present invention is applied, the size of the apparatus is not increased as compared with the related art. The heat storage material 9
In consideration of the heat exchange with the metal honeycomb, a metal honeycomb is used as the type of the adsorbent 7.

【００４２】なお、以上説明した実施形態は、本発明の
理解を容易とするために記載されたものであって、本発
明を限定するために記載されたものではない。従って、
上記の実施形態に開示された各要素は、本発明の技術的
範囲に属する全ての設計変更や均等物をも含む趣旨であ
る。The embodiments described above are described for facilitating the understanding of the present invention, and are not described for limiting the present invention. Therefore,
Each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

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

【図１】本発明の実施形態の構成図である。FIG. 1 is a configuration diagram of an embodiment of the present invention.

【図２】本発明の実施形態の蓄熱材の詳細図であり、
（ａ）は側面図、（ｂ）は（ａ）中のＢ−Ｂ線に沿った
断面図である。FIG. 2 is a detailed view of a heat storage material according to the embodiment of the present invention,
(A) is a side view, and (b) is a cross-sectional view along line BB in (a).

【図３】本発明の実施形態の効果を示す説明図である。FIG. 3 is an explanatory diagram showing an effect of the embodiment of the present invention.

【図４】本発明の実施形態の一部の構成を変更した詳細
図であり、（ａ）は側面図、（ｂ）は（ａ）中のＣ−Ｃ
線に沿った断面図である。FIG. 4 is a detailed view in which a part of the configuration of the embodiment of the present invention is changed, (a) is a side view, and (b) is a CC in (a).
It is sectional drawing along the line.

【図５】吸着剤の入口温度と脱離量との関係を示す特性
図である。FIG. 5 is a characteristic diagram showing a relationship between an inlet temperature of an adsorbent and a desorption amount.

【図６】従来技術の問題点を示す説明図である。FIG. 6 is an explanatory diagram showing a problem of the related art.

【符号の説明】[Explanation of symbols]

１ エンジン ２ メイン通路 ３ バイパス通路 ４ メイン触媒 ５ 排気温度センサ ６ 切替バルブ ７ 吸着剤 ８ ヒータ付き触媒 ９ 蓄熱材 １０ ２次空気切替バルブ １１ エアポンプ DESCRIPTION OF SYMBOLS 1 Engine 2 Main passage 3 Bypass passage 4 Main catalyst 5 Exhaust temperature sensor 6 Switching valve 7 Adsorbent 8 Catalyst with heater 9 Heat storage material 10 Secondary air switching valve 11 Air pump

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｆ０１Ｎ 3/20 ＺＡＢ Ｆ０１Ｎ 3/20 ＺＡＢＫ 3/22 ＺＡＢ 3/22 ＺＡＢ ３０１ ３０１Ｂ 9/00 ＺＡＢ 9/00 ＺＡＢＺ Ｆ０２Ｄ 45/00 ＺＡＢ Ｆ０２Ｄ 45/00 ＺＡＢ ３１０ ３１０Ｂ ３６０ ３６０Ｃ (72)発明者 岡田 圭司 神奈川県横浜市神奈川区宝町２番地 日産 自動車株式会社内──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code FI F01N 3/20 ZAB F01N 3/20 ZABK 3/22 ZAB 3/22 ZAB 301 301B 9/00 ZAB 9/00 ZABZ F02D 45/00 ZAB F02D 45/00 ZAB 310 310B 360 360C (72) Inventor Keiji Okada Nissan Motor Co., Ltd. 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】内燃機関の排気通路に設けられた第１触媒
手段と、 該第１触媒手段の下流側で該排気通路から分岐するバイ
パス通路と、 該バイパス通路に設けられた該バイパス通路を流通する
排気の除去対象成分を吸着する吸着手段と、 該バイパス通路の該吸着手段よりも下流側に設けられた
加熱機能を有する第２触媒手段と、 該バイパス通路の該吸着手段よりも上流側に設けられた
該バイパス通路を流通する排気の温度を抑制する蓄熱手
段と、 該排気通路と該バイパス通路との分岐部に設けられ、所
定の運転状態にあるときに排気を該バイパス通路側に導
く開閉弁と、を備えたことを特徴とする内燃機関の排気
浄化装置。A first catalyst unit provided in an exhaust passage of the internal combustion engine; a bypass passage branching from the exhaust passage downstream of the first catalyst unit; and a bypass passage provided in the bypass passage. An adsorbing means for adsorbing the component to be removed of the flowing exhaust gas; a second catalytic means having a heating function provided downstream of the adsorbing means in the bypass passage; and an upstream of the adsorbing means in the bypass passage. A heat storage means for suppressing the temperature of exhaust gas flowing through the bypass passage provided at a branch portion between the exhaust passage and the bypass passage, and for discharging exhaust gas to the bypass passage side in a predetermined operation state. An exhaust purification device for an internal combustion engine, comprising: an on-off valve for guiding. 【請求項２】前記蓄熱手段は潜熱型であることを特徴と
する請求項１記載の内燃機関の排気浄化装置。2. An exhaust gas purifying apparatus for an internal combustion engine according to claim 1, wherein said heat storage means is of a latent heat type.
JP35830396A 1996-12-27 1996-12-27 Emission purifier for internal combustion engine Pending JPH10184346A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP35830396A JPH10184346A (en) 1996-12-27 1996-12-27 Emission purifier for internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP35830396A JPH10184346A (en) 1996-12-27 1996-12-27 Emission purifier for internal combustion engine

Publications (1)

Publication Number Publication Date
JPH10184346A true JPH10184346A (en) 1998-07-14

Family

ID=18458604

Family Applications (1)

Application Number Title Priority Date Filing Date
JP35830396A Pending JPH10184346A (en) 1996-12-27 1996-12-27 Emission purifier for internal combustion engine

Country Status (1)

Country Link
JP (1) JPH10184346A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017151972A1 (en) * 2016-03-02 2017-09-08 Watlow Electric Manufacturing Company Thermal storage device for use in a fluid flow system
CN114776423A (en) * 2022-04-14 2022-07-22 一汽解放汽车有限公司 Diesel vehicle tail gas online collecting and processing device and control method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017151972A1 (en) * 2016-03-02 2017-09-08 Watlow Electric Manufacturing Company Thermal storage device for use in a fluid flow system
US10470247B2 (en) 2016-03-02 2019-11-05 Watlow Electric Manufacturing Company Susceptor for use in a fluid flow system
US10815858B2 (en) 2016-03-02 2020-10-27 Watlow Electric Manufacturing Company Exhaust system with actuated flow bypass and thermal storage device
CN114776423A (en) * 2022-04-14 2022-07-22 一汽解放汽车有限公司 Diesel vehicle tail gas online collecting and processing device and control method thereof

Similar Documents

Publication Publication Date Title
KR960004832B1 (en) Engine exhaust gas purification apparatus
JPH0559942A (en) Cold hc adsorption removal device
US5373696A (en) Automotive engine with exhaust hydrocarbon adsorber having oxygen sensor regeneration control
JP2000045756A (en) Engine for reducing carbon monoxide, hydrogen and hydrocarbon in exhaust gas and method for the same
JPH1182000A (en) Exhaust gas purifying device in internal combustion engine
JPH10121949A (en) Engine exhaust emission control device
JP2855986B2 (en) Exhaust gas purification device
JPS6368713A (en) Exhaust emission control device for engine
JPH05231134A (en) Engine exhaust emission control system
JP2845080B2 (en) Exhaust gas purification device for internal combustion engine
JP2010101303A (en) Exhaust emission control device of internal combustion engine
JPH10184346A (en) Emission purifier for internal combustion engine
JP2694739B2 (en) Engine exhaust purification device
JP2011001876A (en) Exhaust control device of internal combustion engine
JP2827738B2 (en) Exhaust gas purification device
JP6838384B2 (en) Exhaust gas purification system and poison control method for exhaust gas purification system
JP3515483B2 (en) Exhaust gas purification system
JP3396247B2 (en) Exhaust gas purification device
JPH10184345A (en) Emission control device for engine
JP3055270B2 (en) Exhaust gas purification device for internal combustion engine
JP2000073747A (en) Catalyst system
JPS62189309A (en) Unburnt fuel purifier for alcohol fuel vehicle
JPH0771237A (en) Exhaust emission control device for internal combustion engine
JP3343948B2 (en) Exhaust gas purification device
JP3306914B2 (en) Engine exhaust purification device