EP1507964A1 - Spark ignition engine including three-way catalyst with nox storage component - Google Patents
Spark ignition engine including three-way catalyst with nox storage componentInfo
- Publication number
- EP1507964A1 EP1507964A1 EP03725426A EP03725426A EP1507964A1 EP 1507964 A1 EP1507964 A1 EP 1507964A1 EP 03725426 A EP03725426 A EP 03725426A EP 03725426 A EP03725426 A EP 03725426A EP 1507964 A1 EP1507964 A1 EP 1507964A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- engine
- twc
- nox
- engine according
- nox storage
- 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.)
- Ceased
Links
- 239000003054 catalyst Substances 0.000 title claims abstract description 68
- 239000000446 fuel Substances 0.000 claims abstract description 59
- 230000004044 response Effects 0.000 claims abstract description 10
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 25
- 239000007789 gas Substances 0.000 claims description 22
- 229930195733 hydrocarbon Natural products 0.000 claims description 21
- 150000002430 hydrocarbons Chemical class 0.000 claims description 21
- 239000000203 mixture Substances 0.000 claims description 19
- 239000010948 rhodium Substances 0.000 claims description 18
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 9
- 239000003502 gasoline Substances 0.000 claims description 9
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 7
- 229910052703 rhodium Inorganic materials 0.000 claims description 7
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 6
- 230000032683 aging Effects 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 229910052697 platinum Inorganic materials 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 5
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 5
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 claims description 5
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims description 5
- 229910052746 lanthanum Inorganic materials 0.000 claims description 5
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 4
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 4
- 229910052783 alkali metal Inorganic materials 0.000 claims description 4
- 150000001340 alkali metals Chemical class 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 239000011572 manganese Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910052763 palladium Inorganic materials 0.000 claims description 4
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 4
- 229910052726 zirconium Inorganic materials 0.000 claims description 4
- 239000004215 Carbon black (E152) Substances 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- 239000003915 liquefied petroleum gas Substances 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 239000011777 magnesium Substances 0.000 claims description 3
- 239000003345 natural gas Substances 0.000 claims description 3
- 239000003381 stabilizer Substances 0.000 claims description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 2
- 229910052779 Neodymium Inorganic materials 0.000 claims description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 2
- 229910052777 Praseodymium Inorganic materials 0.000 claims description 2
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052788 barium Inorganic materials 0.000 claims description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052792 caesium Inorganic materials 0.000 claims description 2
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 239000002826 coolant Substances 0.000 claims description 2
- 229910052741 iridium Inorganic materials 0.000 claims description 2
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims description 2
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims description 2
- 229910052762 osmium Inorganic materials 0.000 claims description 2
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 claims description 2
- -1 perovskites Inorganic materials 0.000 claims description 2
- 229910052700 potassium Inorganic materials 0.000 claims description 2
- 239000011591 potassium Substances 0.000 claims description 2
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 claims description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims description 2
- 229910052707 ruthenium Inorganic materials 0.000 claims description 2
- 229910052727 yttrium Inorganic materials 0.000 claims description 2
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims 2
- 150000002910 rare earth metals Chemical class 0.000 claims 2
- VAWSWDPVUFTPQO-UHFFFAOYSA-N calcium strontium Chemical compound [Ca].[Sr] VAWSWDPVUFTPQO-UHFFFAOYSA-N 0.000 claims 1
- 150000002602 lanthanoids Chemical group 0.000 claims 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N nickel(II) oxide Inorganic materials [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 241
- 230000000052 comparative effect Effects 0.000 description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 12
- 229910002091 carbon monoxide Inorganic materials 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 10
- 230000008901 benefit Effects 0.000 description 9
- 238000012360 testing method Methods 0.000 description 8
- 229910052593 corundum Inorganic materials 0.000 description 7
- 239000000758 substrate Substances 0.000 description 7
- 229910001845 yogo sapphire Inorganic materials 0.000 description 7
- 230000009467 reduction Effects 0.000 description 6
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000011068 loading method Methods 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 229910002651 NO3 Inorganic materials 0.000 description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 3
- 239000010970 precious metal Substances 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 150000001341 alkaline earth metal compounds Chemical class 0.000 description 2
- 239000010953 base metal Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 238000009420 retrofitting Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 229910052712 strontium Inorganic materials 0.000 description 2
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- ZMIGMASIKSOYAM-UHFFFAOYSA-N cerium Chemical compound [Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce] ZMIGMASIKSOYAM-UHFFFAOYSA-N 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000002638 heterogeneous catalyst Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9495—Controlling the catalytic process
-
- 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
- F01N3/0828—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
- F01N3/0842—Nitrogen oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
-
- 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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/16—Oxygen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0806—NOx storage amount, i.e. amount of NOx stored on NOx trap
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to a spark ignition engine comprising an exhaust system comprising a catalyst and an engine control unit programmed to control the air- to-fuel ratio of the engine to run at the stoichiometric air-to-fuel ratio during normal running conditions and to run lean of the stoichiometric air-to-fuel ratio during a defined portion of an engine speed/load map.
- the present invention relates to such an engine wherein the catalyst is a three-way catalyst (TWC) including a NOx storage component.
- TWC three-way catalyst
- a heterogeneous catalyst capable of simultaneous conversion of nitrogen oxides (NOx), carbon monoxide (CO) and unburnt hydrocarbons (HC) in exhaust gas from a stoichiometrically operated, spark-ignited combustion engine is known as a three-way catalyst (TWC).
- NOx reduction readily occurs over the TWC when the air-to-fuel ratio is rich of stoichiometric, whereas CO and HC reactions are hindered by insufficient oxygen (O 2 ).
- O 2 oxygen
- the CO and HC conversions are high, but NOx reduction is difficult because of the excess of oxidising species. Accordingly, effective three-way conversion occurs in a relatively narrow air-to-fuel ratio window.
- an oxygen sensor is used to detect the lambda composition of the exhaust gas upstream of the TWC and to adjust the air-to-fuel ratio accordingly to equilibrate the exhaust gas.
- a typical TWC comprises platinum (Pt) and/or palladium (Pd) as an oxidation catalyst and rhodium (Rh) as a reduction catalyst on a suitable high surface area oxide support, such as alumina (Al O 3 ), and an oxygen storage component (OSC), e.g. a ceria- zirconia mixed oxide.
- a suitable high surface area oxide support such as alumina (Al O 3 )
- an oxygen storage component e.g. a ceria- zirconia mixed oxide.
- Various minor amounts of base metal catalyst promoters, stabilisers and hydrogen sulphide suppressers can be included. For further details, see WO 98/03251 (incorporated herein by reference).
- a typical NOx trap composition comprises Pt and Rh on a high surface area oxide support, such as Al 2 O 3 , and a NOx storage component such as barium oxide (BaO (see, e.g. EP 0758713, incorporated herein by reference)).
- a NOx storage component such as barium oxide (BaO (see, e.g. EP 0758713, incorporated herein by reference)).
- loadings of NOx storage components in NOx trap washcoats can be up to 50wt% or even higher
- NOx trap technology requires very careful and complicated control of the engine in order to provide for rich regeneration of the NOx storage component.
- a number of feedback sensors are used to control the function of the NOx trap NOx storage capacity, e.g. sensors to estimate cumulative engine-out NOx production utilising stored engine maps and NOx trap temperature sensors, because the efficiency of the NOx storage component to absorb NOx is temperature dependent.
- Base metal catalyst promoters such as barium (Ba), cerium, lanthanum, magnesium, calcium and strontium can also be used (see WO 98/03251, mentioned above).
- the catalytic converter for a lean burn internal combustion engine, such as a direct injection gasoline engine, comprising a catalyst component capable of storing NOx.
- the catalytic converter comprises a supported layered catalyst having a first, inner layer containing a first platinum group metal (PGM), e.g. Pt, and a NOx storage component, e.g. Ba, and a second, outer layer containing a second different PGM, such as Rh supported on a non-Al 2 O 3 support, and optionally an OSC such as a mixed oxide of ceria and zirconia.
- PGM platinum group metal
- Japanese Unexamined Patent Publication (KOKAI) No. 5-317,652 (incorporated herein by reference) describes a catalyst comprising a substrate, and an alkaline-earth metal compound and Pt loaded on the substrate.
- the gasoline engine is run on the fuel lean side, such as an air-to-fuel ratio of up to 23:1 (wt./wt.).
- the catalyst is designed to adsorb (or absorb) NOx on the alkaline-earth metal during lean rurming conditions and to use the natural fluctuation of the air-to-fuel ratio to the rich side to enable stored NOx to be released and reduced, thus regenerating the NOx storage capacity of the alkaline-earth metal compound.
- 5-317,652 is poisoned by sulfate.
- a catalyst comprising Pt or Pd and alkali metals, alkaline-earth metals and rare-earth elements including lanthanum (La) supported on lithium-stabilised Al 2 O 3 .
- La lanthanum
- spark ignition engine such as a port fuel injection gasoline engine, which engine comprising a
- TWC including a NOx storage component, in such a way as to benefit from the increased fuel economy available during lean running conditions whilst avoiding the requirement for expensive and complicated control systems.
- the invention provides A spark ignition engine comprising an exhaust system comprising a catalyst and an engine control unit programmed to control the air-to-fuel ratio of the engine to run at the stoichiometric air-to-fuel ratio during normal running conditions and to run lean of the stoichiometric air-to-fiiel ratio during a defined portion of an engine speed/load map, which catalyst comprising a three-way catalyst (TWC) including a NOx storage component, characterised in that the engine control unit is further programmed to determine the amount of NOx contacting the TWC during lean running operation in response to data input from sensor means, thereby to determine the remaining NOx storage capacity of the TWC and to return the air-to-fuel ratio to stoichiometry when the remaining NOx storage capacity is below a pre-determined value, the arrangement being such as to substantially prevent passing more NOx to atmosphere during an engine cycle compared with a spark ignition engine run continuously in stoichiometric mode.
- TWC three-way catalyst
- engine cycle herein we mean the period between key on and key off.
- the present invention takes advantage of the natural fluctuation in the composition of an exhaust gas of a spark ignition engine operated at the stoichiometric air-to-fuel ratio to rich lambda values, e.g. during acceleration, to regenerate the NOx storage component.
- a catalyst that facilitates the regeneration of a NOx storage component in a TWC, which catalyst is used in a preferred embodiment according to the invention.
- the present invention provides a number of very substantial advantages.
- One such advantage is that it enables a vehicle powered by a spark ignition engine to be run at a fuel saving over a similar vehicle operated continuously at substantially stoichiometric conditions. Such increased efficiency can result in lower CO 2 emissions in a legislative test cycle for a vehicle. Lower CO 2 emissions in a legislative test cycle translates to lower CO 2 emissions in "real world" driving conditions. Accordingly, a vehicle according to the invention can be more "environmentally friendly”. Furthermore, in countries where vehicles are taxed depending on the amount of CO 2 they emit (a so-called "green tax”), such as the UK, it can reduce the tax burden to the consumer.
- a second such advantage is that it can allow existing vehicles including spark ignition engines to receive the benefit of the invention by retrofitting certain components. This can be done by simply replacing the existing TWC with a TWC including sufficient NOx storage component and the engine control unit for one programmed: (i) to run the engine lean of the stoichiometric air-to-fuel ratio during a defined portion of an engine speed/load map; and (ii) to determine the amount of NOx contacting the TWC during lean running operation in response to data input from sensor means, thereby to determine the remaining NOx storage capacity of the TWC and to return the air-to-fuel ratio to stoichiometry when the remaining NOx storage capacity is below a pre-determined value, thereby substantially to prevent passing more NOx to atmosphere during an engine cycle compared with a spark ignition engine run continuously in stoichiometric mode.
- the defined portion of the engine speed/load map is engine idle.
- the defined portion of the engine speed/load map can comprise low speed driving wherein the level of NOx emitted by the engine is up to ten times more, such as five times or twice more, than at engine idle.
- a very substantial advantage of this preferred arrangement is that it avoids the requirement for complicated and expensive sensors and controls in order to meet emission legislation that presently burdens the adoption of NOx traps.
- a number of means for inputting data to the engine control unit to determine the amount of NOx contacting the TWC, and hence the remaining NOx storage capacity of the NOx storage component, can be used either singly or in any mechanically/electronically viable combination.
- Many of the sensor means required to collect this information are already included in the engine and/or vehicle fitted with the engine and are used by the engine control unit for controlling other functions of the engine and/or vehicle. This is one reason why it is possible to adopt the invention by retrofitting the vehicle engine control unit, together with a TWC including a NOx storage component.
- Such detected data that can be used to monitor remaining NOx storage capacity in the TWC of the invention include: predetermined or predicted time elapsed from the start of lean running operation, by sensing the status of a suitable clock means; airflow over the TWC or manifold vacuum; ignition timing; engine speed; throttle position; exhaust gas redox composition, for example using a lambda sensor, preferably a linear lambda sensor; quantity of fuel injected in the engine; where the vehicle includes an exhaust gas recirculation (EGR) circuit, the position of the EGR valve and thereby the detected amount of EGR; engine coolant temperature; and where the exhaust system includes a NOx sensor, the amount of NOx detected upstream and/or downstream of the TWC.
- EGR exhaust gas recirculation
- the spark ignition engine can be any capable of operating during normal running conditions at the stoichiometric air-to-fuel ratio.
- the engine can be powered by gasoline and the engine can be of the port fuel injection or direct injection type.
- the engine can be fuelled using an alternative fuel such as liquid petroleum gas (LPG), natural gas (NG), methanol, hydrocarbon mixtures including ethanol or hydrogen gas.
- LPG liquid petroleum gas
- NG natural gas
- methanol methanol
- hydrocarbon mixtures including ethanol or hydrogen gas hydrocarbon mixtures including ethanol or hydrogen gas.
- the invention can be used on all grades of sulfur-containing fuel, but with particular efficiency with grades containing less that 50 ppm by weight of sulfur, and most preferably less than 10 ppm by weight of sulfur.
- the present invention can utilise any known TWC composition provided that sufficient NOx storage component is included in order to perform the desired function.
- a typical TWC composition comprises at least one PGM, and can be selected from the group consisting of Pt, Pd, Rh, ruthenium, osmium and iridium and any combination of two or more thereof.
- NOx storage components are disclosed in the prior art, and any can be utilised in the present invention.
- Typical NOx storage components comprise alkali metals, such as potassium or caesium, alkaline-earth metals, e.g. magnesium, calcium, strontium or Ba, rare-earth metals lanthanide group metal, preferably La, or any viable combination, e.g. a mixed oxide, of any two or more thereof.
- a common component of state-of-the-art TWCs is the OSC and these too can be included in the TWC, with utility, according to the present invention.
- OSC an OSC assists in the combustion of HC at the stoichiometric point and slightly rich thereof.
- This property runs counter to the requirement of a system including a NOx trap composition which is to regenerate the NOx storage component using reducing species, such as HCs in the exhaust, resulting from air-to-fuel ratio modulation. Accordingly, the presence of an OSC in a NOx trap composition would cause increased fuel consumption for the same amount of NOx storage component regeneration relative to an OSC-free NOx trap composition.
- OSC include optionally stabilised ceria, perovskites, NiO, MnO , manganese-based compounds supported on Al 2 O 3 -containing mixed oxides (see PCT/GBO 1/05124, incorporated herein by reference) a mixed oxide of manganese and zirconium (see WO 99/34904, incorporated herein by reference), Pr 2 O 3 or a combination of any two or more thereof.
- the ceria stabiliser can be zirconium, lanthanum, aluminium, yttrium, praseodymium or neodymium.
- a preferred TWC for use in the present invention comprises a first PGM, preferably Pt, and the NOx storage component in a first, inner layer and an OSC and a second PGM, preferably Rh, in a second, outer layer.
- Rh/OSC component is active for NOx reduction and other reactions while the Pt component is active for oxidation reactions.
- the Rh is relatively inactive, the Pt is active for NO, HC and CO oxidation while the NO 2 produced is stored in the adsorber as nitrate.
- the OSC component in the second layer prevents the stored NOx "seeing" reducing gas so that the NOx remains stored as nitrate.
- the Rh is active for NOx reduction by CO and the Pt is active for oxidation of HC and CO.
- the invention provides a vehicle comprising an engine according to the present invention.
- TWC are generally placed in one or both of two positions in a vehicle according to the intended purpose: the close-coupled position, in which the TWC is disposed as close to the exhaust manifold as possible; and the underfloor position.
- the reason for placing a TWC in the close-coupled position is to control emissions immediately following cold start, as much of the controlled emissions are emitted during the legislative test cycle immediately following cold-start.
- the catalyst By positioning a TWC close to the engine, the catalyst is contacted by hot exhaust gases immediately after key on and accordingly reaches the light-off temperature for CO and HC oxidation sooner than a TWC in the cooler, underfloor location.
- the underfloor catalyst shoulders much of the burden of treating the exhaust gas.
- close-coupled TWC is exposed to very high temperatures e.g. up to 1000°C.
- catalyst bed temperatures e.g. 970°C and up to 1010°C.
- catalysts can lose activity as materials lose their surface area through sintering events, migration of active species into pores and component interactions. Accordingly, a TWC in the close-coupled position can be expected to lose some of its activity compared with a fresh catalyst.
- the NOx storage component can also lose NOx storage capacity through this high temperature ageing by loss of surface area.
- the fresh TWC includes sufficient of the NOx storage component to retain sufficient NOx storage capacity after high temperature ageing, for example in the close-coupled position.
- the invention provides An engine control unit for a spark ignition engine comprising an exhaust system comprising a TWC including a NOx storage component, which engine control unit is programmed to control the air-to-fuel ratio of the engine to run at the stoichiometric air-to-fuel ratio during normal running conditions and to run lean of stoichiometry during a defined portion of an engine speed load map and to determine the amount of NOx contacting the TWC during lean running operation in response to data input from sensor means, thereby to determine the remaining NOx storage capacity of the TWC and to return the air-to-fuel ratio to stoichiometry when the remaining NOx storage capacity is below a pre-determined value, the arrangement being such as to substantially prevent passing more NOx to atmosphere during an engine cycle compared with a spark ignition engine run continuously in stoichiometric mode.
- the invention provides A method of treating exhaust gas of a spark ignition engine run at the stoichiometric air-to-fuel ratio during normal nuining conditions, which engine comprising an exhaust system comprising a TWC including a NOx storage component, which method comprising the steps of controlling the engine air-to-fuel ratio to run lean of stoichiometry during a defined portion of an engine speed/load map and determining the amount of NOx contacting the TWC during lean ranning operation in response to data input from sensor means, thereby to determine the remaining NOx storage capacity of the TWC and to return the air-to- fuel ratio to stoichiometry when the remaining NOx storage capacity is below a predetermined value, the arrangement being such as to substantially prevent passing more NOx to atmosphere during an engine cycle compared with a spark ignition engine run continuously in stoichiometric mode.
- Figure 1 is a graph showing HC conversion against temperature after ageing of a TWC including a NOx storage component according to the invention, a state-of-the-art TWC and a NOx trap;
- Figures 2, 3 and 4 are graphs showing % conversion of CO, HC and NOx against lambda for a TWC including a NOx storage component according to the invention, a state-of-the-art TWC and a NOx trap formulation respectively.
- Comparative catalyst A is a state- of-the art Pt/Rh TWC on a thermally stable, high surface area support at a ratio of 5Pt:lRh and a total precious metal loading of at 60 g ft "3 .
- Catalyst B is a TWC including a NOx storage component according to the present invention supported on an identical substrate. It comprised a first, inner layer of a high surface area Al 2 O 3 impregnated with Pt and a NOx storage component, such as
- Comparative catalyst C is a NOx trap composition comprising a high surface area Al 2 O 3 -based mixed oxide support impregnated with Pt, Rh and a NOx storage component.
- the ratio of Pt:Rh was 6:1 and the total precious metal loading was 70 g ft "3 .
- Each washcoat was coated on a 4.66 x 6 inch (11.9 x 15.2 cm) ceramic substrate of 400 cells per square inch ((cpsi) 62 cells cm “2 ) of 0.15 mm wall thickness and the resulting coated substrate was hydrothermally aged at 800°C for 5 hours under 10% O 2 /10% H 2 O/balance nitrogen.
- the catalysts were fitted to the exhaust of a four cylinder 2.0 litre Port Fuel
- Injection bench mounted engine controlled by a Bosch ME7 control system The catalyst temperature was increased by adjustment of a heat exchanger fitted to the exhaust line before the catalyst.
- the temperature ramp rate was 14 °C/minute.
- Example 2 In a bench test cell, a 4 cylinder, 1.8 litre, 1997 model year, Mitsubishi direct injection engine from a vehicle calibrated for the Japanese market was installed with a direct current dynamometer. A catalyst substrate prepared according to Example 1 was fitted in the close-coupled position approximately 30 cm from the engine exhaust manifold. The substrate volume represented of 22% engine swept volume (ESV). Concentrations of NOx, HC, CO 2 , CO and O 2 were measured using a dual bank of MEXA (Motor Exhaust Gas Analyser) 9500 sensors to allow continuous measurement of gas concentrations upstream and downstream of the catalyst. The catalyst inlet temperature was measured by thermocouple.
- MEXA Motor Exhaust Gas Analyser
- the engine was operated from one of two sets of maps: one for the homogeneous mode and the other for the lean, stratified mode.
- Basic maps for ignition and injection timing and duration were generated by firstly logging data from the ECU of a vehicle including the same model of engine as the one used for the bench test and then basing the maps on this information by reverse engineering.
- the lean, stratified mode was mapped by matching the torque achieved in homogeneous mode at the same speed and load demand.
- the engine Prior to testing, the engine was thoroughly warmed up in idling condition. In homogeneous mode, the engine was then run so that the inlet temperature to the close- coupled catalyst was 300 °C. It was then switched to lean, stratified operation and the EGR valve position was adjusted until the engine-out NOx was 300 ppm. The EGR valve position was recorded and was referred to as the lean set point. The engine was switched back to homogeneous mode, and the EGR valve was closed. A rich set point was obtained by increasing the fuel injector pulse width to obtain lambda 0.80. A series of lean/rich cycles were run as follows. In the lean mode, the EGR valve was at the lean set-point position until the NOx efficiency of the system had dropped below 75%.
- Table 1 shows the NOx storage efficiency with which each of comparative catalysts A and C and catalyst B store NOx, and in particular, how the efficiency with which each catalyst stores 30, 40, 50 and 60 mg of NOx.
- NOx trap comparative catalyst C
- TWC comparative catalyst A
- Example 1 The results of Examples 1, 2 and 3 show that the TWC including a NOx storage component maintains TWC performance despite including a NOx storage component, and that NOx storage capacity is several times higher than a state-of-the-art TWC composition.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Biomedical Technology (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Exhaust Gas After Treatment (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0211971 | 2002-05-24 | ||
GBGB0211971.7A GB0211971D0 (en) | 2002-05-24 | 2002-05-24 | Spark ignition engine including three-way catalyst |
PCT/GB2003/002200 WO2003100228A1 (en) | 2002-05-24 | 2003-05-21 | Spark ignition engine including three-way catalyst with nox storage component |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1507964A1 true EP1507964A1 (en) | 2005-02-23 |
Family
ID=9937339
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03725426A Ceased EP1507964A1 (en) | 2002-05-24 | 2003-05-21 | Spark ignition engine including three-way catalyst with nox storage component |
Country Status (6)
Country | Link |
---|---|
US (1) | US20060075740A1 (en) |
EP (1) | EP1507964A1 (en) |
JP (1) | JP4494201B2 (en) |
KR (1) | KR20050013996A (en) |
GB (1) | GB0211971D0 (en) |
WO (1) | WO2003100228A1 (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4434038B2 (en) * | 2004-04-05 | 2010-03-17 | 株式会社デンソー | Exhaust gas purification device for internal combustion engine |
DE102004043421A1 (en) * | 2004-09-06 | 2006-03-23 | W.C. Heraeus Gmbh | Catalyst for 2-stroke engines or small engines |
FR2892766A1 (en) * | 2005-10-27 | 2007-05-04 | Renault Sas | Propulsion system for motor vehicle e.g. commercial vehicle, has logic controller triggering injection of required quantity when ratio between required quantity and nitrogen oxide quantity is less than triggering threshold |
DE102005063204B4 (en) * | 2005-12-31 | 2015-08-20 | Volkswagen Ag | Design and operation of a lean-running internal combustion engine with adapted exhaust aftertreatment |
DE102007019460A1 (en) * | 2007-04-25 | 2008-11-06 | Man Nutzfahrzeuge Ag | aftertreatment system |
US8056544B2 (en) * | 2008-08-27 | 2011-11-15 | Ford Global Technologies, Llc | Exhaust gas recirculation (EGR) system |
US8906330B2 (en) | 2009-05-04 | 2014-12-09 | Basf Corporation | Lean HC conversion of TWC for lean burn gasoline engines |
DE102010028373A1 (en) | 2010-04-29 | 2011-11-03 | Ford Global Technologies, Llc | Method for monitoring operating condition of nitrogen oxide-storage catalyst in exhaust gas system of internal combustion engine, involves inducing fully loaded condition of nitrogen oxide-storage catalyst |
DE102010028371A1 (en) | 2010-04-29 | 2011-11-03 | Ford Global Technologies, Llc | Method for controlling exhaust emission of spark ignited Otto engine, involves obtaining modified lambda nominal value by nominal lambda reference value such that dynamic correction terms are added to nominal lambda reference value |
US9309823B2 (en) * | 2014-01-13 | 2016-04-12 | GM Global Technology Operations LLC | Exhaust gas recirculation cooler protection system and method |
US10329979B2 (en) | 2015-09-15 | 2019-06-25 | Ai Alpine Us Bidco Inc | Engine controller and methods for controlling emission and power generation system using the same |
WO2017082563A1 (en) * | 2015-11-10 | 2017-05-18 | 희성촉매 주식회사 | Exhaust purification catalyst for stoichiometrically operated gasoline engine |
GB2555483B (en) * | 2016-11-01 | 2020-02-26 | Jaguar Land Rover Ltd | Exhaust gas treatment method and apparatus |
JP7110837B2 (en) * | 2018-09-04 | 2022-08-02 | トヨタ自動車株式会社 | Exhaust purification system for internal combustion engine |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3328318B2 (en) | 1992-05-22 | 2002-09-24 | トヨタ自動車株式会社 | Exhaust gas purification method |
US5622047A (en) * | 1992-07-03 | 1997-04-22 | Nippondenso Co., Ltd. | Method and apparatus for detecting saturation gas amount absorbed by catalytic converter |
JP3291086B2 (en) | 1993-09-24 | 2002-06-10 | トヨタ自動車株式会社 | Exhaust gas purification catalyst and exhaust gas purification method |
JP3899534B2 (en) | 1995-08-14 | 2007-03-28 | トヨタ自動車株式会社 | Exhaust gas purification method for diesel engine |
JP3395525B2 (en) * | 1996-06-10 | 2003-04-14 | 株式会社日立製作所 | Internal combustion engine exhaust gas purification catalyst and purification method |
CA2257949C (en) * | 1996-06-10 | 2003-02-11 | Hitachi, Ltd. | Exhaust gas purification apparatus of internal combustion engine and catalyst for purifying exhaust gas of internal combustion engine |
GB9615123D0 (en) | 1996-07-18 | 1996-09-04 | Johnson Matthey Plc | Three-way conversion catalysts and methods for the preparation therof |
GB9713428D0 (en) | 1997-06-26 | 1997-08-27 | Johnson Matthey Plc | Improvements in emissions control |
GB9800325D0 (en) | 1998-01-09 | 1998-03-04 | Johnson Matthey Plc | Improvements in catalytic materials |
GB2355944B (en) * | 1998-09-18 | 2001-11-14 | Toyota Motor Co Ltd | An exhaust gas purification device for an internal combustion engine |
JP3370957B2 (en) * | 1998-09-18 | 2003-01-27 | トヨタ自動車株式会社 | Exhaust gas purification device for internal combustion engine |
JP2000282848A (en) * | 1999-03-30 | 2000-10-10 | Nissan Motor Co Ltd | Exhaust emission control device for internal combustion engine |
JP4465799B2 (en) * | 1999-04-20 | 2010-05-19 | マツダ株式会社 | Exhaust gas purification device, exhaust gas purification method, and exhaust gas purification catalyst |
JP3693855B2 (en) * | 1999-06-07 | 2005-09-14 | 三菱電機株式会社 | Air-fuel ratio control device for internal combustion engine |
EP1201302B1 (en) * | 2000-02-22 | 2007-08-08 | Mazda Motor Corporation | Exhaust gas purifying catalyst and production method for exhaust gas purifying catalyst |
JP3858554B2 (en) * | 2000-02-23 | 2006-12-13 | 株式会社日立製作所 | Engine exhaust purification system |
-
2002
- 2002-05-24 GB GBGB0211971.7A patent/GB0211971D0/en not_active Ceased
-
2003
- 2003-05-21 WO PCT/GB2003/002200 patent/WO2003100228A1/en active Application Filing
- 2003-05-21 US US10/515,529 patent/US20060075740A1/en not_active Abandoned
- 2003-05-21 JP JP2004507658A patent/JP4494201B2/en not_active Expired - Lifetime
- 2003-05-21 KR KR10-2004-7018993A patent/KR20050013996A/en not_active Application Discontinuation
- 2003-05-21 EP EP03725426A patent/EP1507964A1/en not_active Ceased
Non-Patent Citations (2)
Title |
---|
None * |
See also references of WO03100228A1 * |
Also Published As
Publication number | Publication date |
---|---|
GB0211971D0 (en) | 2002-07-03 |
JP4494201B2 (en) | 2010-06-30 |
US20060075740A1 (en) | 2006-04-13 |
KR20050013996A (en) | 2005-02-05 |
WO2003100228A1 (en) | 2003-12-04 |
JP2005534841A (en) | 2005-11-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2173983B1 (en) | Exhaust gas purifying system | |
EP0896134B1 (en) | Exhaust gas purifying system for engine | |
KR101419687B1 (en) | Nitrogen oxide storage catalyst featuring a reduced desulfurization temperature | |
US6620392B2 (en) | Catalyst for purifying exhaust gas and method for purifying exhaust gas with the catalyst | |
EP1322404B1 (en) | Nox-trap | |
US6953769B2 (en) | Exhaust gas purifying catalyst | |
EP1313934B1 (en) | Exhaust system for lean-burn engines | |
US20060075740A1 (en) | Spark ignition engine including three-way catalyst with nox storage component | |
Fekete et al. | Evaluation of NOx storage catalysts for lean burn gasoline fueled passenger cars | |
JP2016179451A (en) | Exhaust gas purification catalyst device and exhaust gas purification method | |
US7043901B2 (en) | Device and method for internal combustion engine control | |
EP1211395B1 (en) | Catalyst device for clarification of exhaust gas | |
US7287371B2 (en) | Device and method for internal combustion engine control | |
US7603847B2 (en) | Device and method for internal combustion engine control | |
JP2004100626A (en) | Exhaust emission control device for engine | |
JP2004100483A (en) | Exhaust gas cleaning method | |
JP5142086B2 (en) | Exhaust purification system | |
JP4617620B2 (en) | Catalyst for oxidizing exhaust gas containing phosphorus, and exhaust gas oxidizer | |
JPH1181987A (en) | Nox purifying method |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20041110 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR |
|
RBV | Designated contracting states (corrected) |
Designated state(s): DE FI FR GB SE |
|
17Q | First examination report despatched |
Effective date: 20110223 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: JOHNSON MATTHEY PUBLIC LIMITED COMPANY |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R003 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
|
18R | Application refused |
Effective date: 20170323 |