JP2000192814A5 - - Google Patents

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Publication number
JP2000192814A5
JP2000192814A5 JP2000027322A JP2000027322A JP2000192814A5 JP 2000192814 A5 JP2000192814 A5 JP 2000192814A5 JP 2000027322 A JP2000027322 A JP 2000027322A JP 2000027322 A JP2000027322 A JP 2000027322A JP 2000192814 A5 JP2000192814 A5 JP 2000192814A5
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JP
Japan
Prior art keywords
nox
exhaust gas
nox adsorption
purifying apparatus
gas purifying
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Application number
JP2000027322A
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Japanese (ja)
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JP2000192814A (en
JP4027555B2 (en
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Publication date
Priority claimed from JP09013655A external-priority patent/JP3107294B2/en
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Publication of JP2000192814A publication Critical patent/JP2000192814A/en
Publication of JP2000192814A5 publication Critical patent/JP2000192814A5/ja
Application granted granted Critical
Publication of JP4027555B2 publication Critical patent/JP4027555B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Claims (3)

排ガス中の各成分間の酸化還元化学量論関係において還元剤に対して酸化剤が多い状態でＮＯｘを化学吸着し、酸化剤に対し還元剤が同量以上の状態で吸着したＮＯｘを接触還元するＮＯｘ吸着触媒を排ガス流路に配置してなる排ガス浄化装置であって、前記ＮＯｘ吸着触媒としてカリウム，ナトリウム，ストロンチウム及びカルシウムから選ばれる少なくとも一種と、セリウム等の希土類から選ばれる少なくとも一種と、白金，ロジウム，パラヂウム等の貴金属から選ばれる少なくとも一種と、チタン及びシリコンから選ばれる少なくとも一種の元素を含む、金属及び金属酸化物もしくは複合酸化物からなる組成物を多孔質耐熱性金属酸化物に担持してなる触媒を備え、ＥＣＵの判定及び制御信号によりリーン運転時には前記ＮＯｘ吸着触媒のＮＯｘ吸着能力を常時判定して、ＮＯｘ浄化能力が低下した場合に空燃比をリッチ側にシフトして前記吸着触媒の吸着能を回復させることを特徴とする内燃機関の排ガス浄化装置。In the oxidation-reduction stoichiometry relationship between each component in the exhaust gas, NOx is chemisorbed in a state where the oxidizing agent is large relative to the reducing agent, and NOx adsorbed in a state where the reducing agent is equal to or more than the oxidizing agent is catalytically reduced. An exhaust gas purifying apparatus having a NOx adsorption catalyst arranged in an exhaust gas flow path , wherein the NOx adsorption catalyst is at least one selected from potassium, sodium, strontium and calcium, and at least one selected from rare earths such as cerium; A composition comprising a metal and a metal oxide or a composite oxide containing at least one selected from noble metals such as platinum, rhodium and palladium and at least one element selected from titanium and silicon is used as a porous heat-resistant metal oxide. The lean catalyst is provided during lean operation according to a judgment and control signal of the ECU. Of the NOx adsorbing capacity at all times determined by exhaust gas purifying apparatus for an internal combustion engine, characterized in that by shifting the air-fuel ratio to the rich side to restore the adsorption capacity of the adsorption catalyst when the NOx purifying ability is lowered. 請求項１において、前記リーン運転時にＮＯｘ吸着量の推定演算を行い該推定ＮＯｘ吸着量が所定限界量であるか否かを判定し、ＮＯｘ吸着能がない場合に前記リッチ側へのシフトを行うことを特徴とする内燃機関の排ガス浄化装置。 2. The method according to claim 1, wherein an estimation calculation of the NOx adsorption amount is performed during the lean operation to determine whether or not the estimated NOx adsorption amount is a predetermined limit amount, and if there is no NOx adsorption capability, the shift to the rich side is performed. An exhaust gas purifying apparatus for an internal combustion engine, comprising: 請求項１において、前記リーン運転時にＮＯｘ吸着量の推定演算を行い該推定ＮＯｘ吸着量が所定限界量であるか否かを判定し、ＮＯｘ吸着能がある場合には前記ＥＣＵの指示通りの設定空燃比を行うことを特徴とする内燃機関の排ガス浄化装置。 2. The ECU according to claim 1, wherein an estimation calculation of the NOx adsorption amount is performed during the lean operation, and it is determined whether or not the estimated NOx adsorption amount is a predetermined limit amount. An exhaust gas purifying apparatus for an internal combustion engine, which performs an air-fuel ratio .
JP2000027322A 1997-01-28 2000-01-31 Exhaust gas purification device for internal combustion engine Expired - Fee Related JP4027555B2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP09013655A JP3107294B2 (en) 1997-01-28 1997-01-28 Exhaust gas purification device for internal combustion engine

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP09013655A Division JP3107294B2 (en) 1996-06-10 1997-01-28 Exhaust gas purification device for internal combustion engine

Publications (3)

Publication Number Publication Date
JP2000192814A JP2000192814A (en) 2000-07-11
JP2000192814A5 true JP2000192814A5 (en) 2004-10-28
JP4027555B2 JP4027555B2 (en) 2007-12-26

Family

ID=11839237

Family Applications (4)

Application Number Title Priority Date Filing Date
JP09013655A Expired - Fee Related JP3107294B2 (en) 1996-06-10 1997-01-28 Exhaust gas purification device for internal combustion engine
JP2000027323A Expired - Fee Related JP4027556B2 (en) 1997-01-28 2000-01-31 Exhaust gas purification device for internal combustion engine
JP2000027321A Expired - Fee Related JP3746179B2 (en) 1997-01-28 2000-01-31 Exhaust gas purification device for internal combustion engine
JP2000027322A Expired - Fee Related JP4027555B2 (en) 1997-01-28 2000-01-31 Exhaust gas purification device for internal combustion engine

Family Applications Before (3)

Application Number Title Priority Date Filing Date
JP09013655A Expired - Fee Related JP3107294B2 (en) 1996-06-10 1997-01-28 Exhaust gas purification device for internal combustion engine
JP2000027323A Expired - Fee Related JP4027556B2 (en) 1997-01-28 2000-01-31 Exhaust gas purification device for internal combustion engine
JP2000027321A Expired - Fee Related JP3746179B2 (en) 1997-01-28 2000-01-31 Exhaust gas purification device for internal combustion engine

Country Status (1)

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JP (4) JP3107294B2 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4438114B2 (en) 1999-01-14 2010-03-24 株式会社日立製作所 Exhaust gas purification method, exhaust gas purification catalyst and exhaust gas purification device for internal combustion engine
JP3897483B2 (en) * 1999-03-31 2007-03-22 トヨタ自動車株式会社 Exhaust gas purification catalyst, method for producing the same, and exhaust gas purification method
DE10003219A1 (en) * 2000-01-26 2001-08-02 Volkswagen Ag Method and device for controlling a NOx storage catalytic converter arranged in an exhaust gas duct of an internal combustion engine
JP2004162626A (en) 2002-11-14 2004-06-10 Hitachi Ltd Exhaust emission control device
JP2006122873A (en) * 2004-11-01 2006-05-18 Mitsubishi Heavy Ind Ltd Adsorbent filling structure for denitrification device
JP4332102B2 (en) * 2004-11-30 2009-09-16 本田技研工業株式会社 Engine air-fuel ratio control device
JP4510651B2 (en) * 2005-01-28 2010-07-28 本田技研工業株式会社 Exhaust gas purification device for internal combustion engine
JP4605397B2 (en) * 2006-05-16 2011-01-05 三菱自動車工業株式会社 NOx catalyst deterioration diagnosis device
RU2457901C2 (en) * 2008-03-19 2012-08-10 АйСиТи КО., ЛТД. Catalyst for cleaning internal combustion engine exhaust gas and method of cleaning exhaust gas using said catalyst

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