WO2010146718A1 - 内燃機関の排気浄化装置 - Google Patents
内燃機関の排気浄化装置 Download PDFInfo
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- WO2010146718A1 WO2010146718A1 PCT/JP2009/061252 JP2009061252W WO2010146718A1 WO 2010146718 A1 WO2010146718 A1 WO 2010146718A1 JP 2009061252 W JP2009061252 W JP 2009061252W WO 2010146718 A1 WO2010146718 A1 WO 2010146718A1
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- fuel ratio
- exhaust gas
- air
- catalyst device
- internal combustion
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- 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
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- 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
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
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- 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
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- 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
- F01N3/24—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 constructional aspects of converting apparatus
- F01N3/36—Arrangements for supply of additional fuel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/208—Hydrocarbons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/90—Physical characteristics of catalysts
- B01D2255/91—NOx-storage component incorporated in the catalyst
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/402—Dinitrogen oxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/404—Nitrogen oxides other than dinitrogen oxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
- B01D2258/012—Diesel engines and lean burn gasoline engines
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- 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
- F01N2570/14—Nitrogen oxides
- F01N2570/145—Dinitrogen oxide
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- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
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- 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
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- 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
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
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- 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 an exhaust purification device for an internal combustion engine.
- a NO X catalyst device for purifying NO X in exhaust gas is disposed.
- Such NO X catalyst device when the exhaust gas is lean, that is, when a high concentration of oxygen in the exhaust gases, have been proposed NO X catalyst device to satisfactorily retain the NO X in the exhaust gas Yes.
- the air-fuel ratio of the exhaust gas is set to the stoichiometric air-fuel ratio or the rich air-fuel ratio as a regeneration process, that is, if the oxygen concentration in the exhaust gas is reduced, the retained NO X is released, The NO X thus released can be reduced and purified to N 2 by the reducing substance in the exhaust gas.
- N 2 O dinitrogen monoxide or nitrous oxide
- N 2 O nitrogen monoxide or nitrous oxide
- the exhaust gas purification apparatus for an internal combustion engine described above has a rich combustion air-fuel ratio rather than supplying fuel to the exhaust passage, assuming that if the oxygen concentration in the exhaust gas during the regeneration process is high, the amount of N 2 O produced increases. in advance to reduce the oxygen concentration in the exhaust gas during regeneration process that flows into the NO X catalyst device as an air-fuel ratio.
- the combustion air-fuel ratio is made rich, the oxygen concentration in the exhaust gas can be reduced, and the reducing substance contained in the exhaust gas becomes CO and low-boiling reformed HC, so that NO X is reduced well. Can be purified.
- the combustion air-fuel ratio is set to a rich air-fuel ratio during the regeneration process in this way, the amount of N 2 O produced during the regeneration process can be reduced overall due to a decrease in the oxygen concentration in the exhaust gas. A large amount of N 2 O may be generated, and the outflow amount of N 2 O accompanying the regeneration process cannot be sufficiently reduced.
- an object of the present invention when a high concentration of oxygen in the exhaust gas satisfactorily hold the NO X in the exhaust gas, as the reproduction process, if lower the oxygen concentration in the exhaust gas, the held NO X
- the combustion air-fuel ratio is set to a rich air-fuel ratio. This is to sufficiently reduce the outflow amount of N 2 O flowing out from the NO X catalyst device along with the regeneration process.
- the exhaust gas purification apparatus for an internal combustion engine according to claim 1 of the present invention can maintain NO x in the exhaust gas when the oxygen concentration in the exhaust gas is high, and can reduce the oxygen concentration in the exhaust gas as a regeneration process.
- the regeneration processing is carried out by changing the set rich air-fuel ratio of the combustion air-fuel ratio from the lean air-fuel ratio, the setting of the air-fuel ratio is the lean air-fuel ratio of the exhaust gas in the NO X catalyst device in order to start the reproduction process first setting period between until rich air-fuel ratio, and, contact after the air-fuel ratio of the exhaust gas in the NO X catalyst device becomes the stoichiometric air-fuel ratio in order to end the reproduction process N 2 O reducing agent is supplied to the NO X catalyst device in at least one of the second set periods.
- the exhaust gas purification apparatus for an internal combustion engine wherein the combustion air-fuel ratio is set to start the regeneration process during the first set period. It is set to start when a first set time elapses from when the lean air-fuel ratio is changed to the set rich air-fuel ratio.
- An internal combustion engine exhaust gas purification apparatus is the internal combustion engine exhaust gas purification apparatus according to the first aspect, wherein the combustion air-fuel ratio is set during the second set period in order to end the regeneration process. It is set to start when a second set time elapses from when the set rich air-fuel ratio is changed to the lean air-fuel ratio.
- the exhaust gas purification apparatus for an internal combustion engine according to claim 4 according to the present invention is the exhaust gas purification apparatus for an internal combustion engine according to any one of claims 1 to 3, wherein the N 2 O reducing agent is used during regeneration processing. It is characterized by being a fuel having a boiling point higher than that of the low-boiling reformed HC contained in the exhaust gas.
- the N 2 O reducing agent is supplied into the cylinder in an expansion stroke or an exhaust stroke. and wherein said being supplied to the NO X catalyst device together with the exhaust gas after.
- the exhaust gas purification apparatus for an internal combustion engine according to claim 6 according to the present invention is the exhaust gas purification apparatus for an internal combustion engine according to claim 4, wherein the N 2 O reducing agent is an exhaust passage on the upstream side of the NO X catalyst apparatus. characterized in that it is supplied to the NO X catalyst device together with the exhaust gas after being supplied to.
- the exhaust purification device of an internal combustion engine having a NO X catalyst device which is capable of reduce and purify NO X in which is disengaged to N 2 by reducing substances in the exhaust gas in the reproduction process is carried out by changing the set rich air-fuel ratio of the combustion air-fuel ratio from the lean air-fuel ratio, setting the air-fuel ratio is a lean air-fuel ratio of the exhaust gas in the NO X catalyst device in order to start the playback processing rich During the first setting period until the air-fuel ratio is reached, the air-fuel ratio of the exhaust gas flowing into the NO X catalyst device becomes near the stoichiometric air-fuel ratio, and the separated NO X is not sufficiently reduced to generate N 2 O
- the exhaust purification device of an internal combustion engine having a NO X catalyst device which is capable of reduce and purify NO X in which is disengaged to N 2 by reducing substances in the exhaust gas in the reproduction process is carried out by changing the set rich air-fuel ratio of the combustion air-fuel ratio from the lean air-fuel ratio
- N 2 O can be reduced to N 2, NO, or the like, and the amount of N 2 O flowing out from the NO X catalyst device along with the regeneration process can be sufficiently reduced.
- the combustion air-fuel ratio is set in order to start the regeneration process. It is set to start when the first set time elapses from when the lean air-fuel ratio is changed to the set rich air-fuel ratio, and N 2 is sent to the NO X catalyst device in the first set period in consideration of the first set time.
- An O reducing agent can be supplied.
- the combustion air-fuel ratio is set to end the regeneration process. It is set to start when the second set time has elapsed from when the set rich air-fuel ratio is changed to the lean air-fuel ratio, and N 2 is sent to the NO X catalyst device in the second set period in consideration of the second set time.
- An O reducing agent can be supplied.
- the N 2 O reducing agent is used during the regeneration process.
- the N 2 O reducing agent is supplied into the cylinder in the expansion stroke or the exhaust stroke.
- the NO x catalyst device is supplied together with the exhaust gas, and the low boiling point reforming HC contained in the exhaust gas during the regeneration process in which the combustion air-fuel ratio is changed from the lean air-fuel ratio to the set rich air-fuel ratio without being modified as can be supplied to the NO X catalyst device as a fuel having a high boiling point.
- the N 2 O reducing agent is an exhaust passage on the upstream side of the NO X catalyst device.
- the NO X catalyst device is adapted to be supplied to the low boiling points contained in the exhaust gas during regeneration process to set a rich air-fuel ratio combustion air-fuel ratio from a lean air-fuel ratio with the exhaust gas after being supplied to the without being modified as reforming HC, it can be fed to the NO X catalyst device as a fuel having a high boiling point.
- 1 is a schematic view showing an embodiment of an exhaust gas purification apparatus for an internal combustion engine according to the present invention.
- 6 is a time chart showing an air-fuel ratio A change in a NO X catalyst device and a N 2 O generation amount M change in a regeneration process. Is a graph showing the N 2 O reduction rate for each reducing substances.
- FIG. 1 is a schematic view showing an exhaust gas purification apparatus for an internal combustion engine according to the present invention.
- reference numeral 1 denotes an internal combustion engine.
- the internal combustion engine 1 is a diesel engine, but may be a direct injection spark ignition internal combustion engine that performs lean combustion.
- 2 is a pair of intake ports that communicate with a cylinder via a pair of intake valves 3
- 4 is a pair of exhaust ports that communicates with a cylinder via a pair of exhaust valves 5.
- 6 is a piston
- 7 is a combustion chamber formed on the top surface of the piston 6
- 8 is a fuel injection valve for injecting fuel into the combustion chamber 7.
- Reference numeral 9 denotes an exhaust manifold connected to the exhaust port 4 of each cylinder
- reference numeral 10 denotes a single exhaust passage on the downstream side of the exhaust manifold 9.
- the exhaust gas of an internal combustion engine 1 to carry out the lean combustion such as a diesel engine or a direct injection spark ignition internal combustion engine, in order to contain a relatively large amount of NO X, in the exhaust passage 10, the NO X NO X catalyst device 11 for purifying are disposed.
- a fuel supply device 12 for supplying fuel is disposed immediately upstream of the NO X catalyst device 11 in the exhaust passage 10.
- 13 is an air-fuel ratio sensor for detecting an air-fuel ratio of the exhaust gas flowing into the NO X catalyst device 11.
- the NO X catalyst device 11 carries a NO X holding agent and a noble metal catalyst such as platinum Pt.
- the NO X retention agent is at least one selected from an alkali metal such as potassium K, sodium Na, lithium Li and cesium Cs, an alkaline earth such as barium Ba and calcium Ca, and a rare earth such as lanthanum La and yttrium Y.
- an alkali metal such as potassium K, sodium Na, lithium Li and cesium Cs
- an alkaline earth such as barium Ba and calcium Ca
- a rare earth such as lanthanum La and yttrium Y.
- NO X cannot be held indefinitely, and as a regeneration process, the air-fuel ratio of the exhaust gas is reduced before the NO X hold amount reaches the NO X holdable amount and can no longer hold NO X.
- the rich air-fuel ratio is set, that is, the oxygen concentration in the exhaust gas is lowered.
- the retained NO X is desorbed, that is, the absorbed NO X is released, and the adsorbed NO 2 is desorbed, and the desorbed NO X is reduced and purified to N 2 by the reducing substance in the exhaust gas.
- the amount of fuel injected by the fuel injection valve 8 in the compression stroke is increased, or additional fuel is injected by the fuel injection valve 8 during the combustion in the initial stage of the expansion stroke, and the combustion air-fuel ratio is increased.
- the combustion air-fuel ratio is set from the set rich air-fuel ratio to the lean of normal operation in order to end the regeneration processing. It will return to the air-fuel ratio.
- the lean air-fuel ratio before and after the regeneration process may not necessarily be the same depending on the operation state.
- the increase fuel injection in the compression stroke may be continuous injection or a plurality of split injections such as two or three splits. But it ’s okay.
- N 2 O dinitrogen monoxide or nitrous oxide
- Figure 2 is a time chart illustrating the air-fuel ratio A change in the NO X catalyst device 11 at the time of reproduction processing, the N 2 O production amount M varies.
- time t1 is the start time of regeneration processing control in which the combustion air-fuel ratio is switched from the lean air-fuel ratio AL (eg, 22) to the set rich air-fuel ratio AR (eg, 12).
- combustion air-fuel ratio is a rich air-fuel ratio AR, the air-fuel ratio A in the NO X catalyst device 11, the exhaust gas of a lean air-fuel ratio AL satisfying the exhaust passage 10 upstream of the exhaust manifold 9 and NO X catalyst device 11 The gas does not immediately become the rich air-fuel ratio AR, but gradually changes from the lean air-fuel ratio AL to the rich side, and reaches the set rich air-fuel ratio AR at time t4.
- the first set period starts at time t2.
- the first set time the more shortened volume of the upstream-side exhaust passage 10 of the exhaust manifold 9 and NO X catalyst device 11 is small, becomes shorter as the difference between the lean air-fuel ratio AL and the theoretical air-fuel ratio AS is small, also, The larger the difference between the theoretical air-fuel ratio AS and the set rich air-fuel ratio AR, the shorter.
- Time t5 is the end time of the regeneration process control in which the combustion air-fuel ratio is switched from the set rich air-fuel ratio AR to the lean air-fuel ratio AL.
- combustion air-fuel ratio is a lean air-fuel ratio AL, air-fuel ratio A in the NO X catalyst device 11, the setting the rich air-fuel ratio AR satisfying exhaust manifold 9 and the upstream side of the exhaust passage 10 of the NO X catalyst device 11
- the exhaust gas does not immediately become the lean air-fuel ratio AL, but gradually changes from the rich air-fuel ratio AR to the lean side, and becomes the lean air-fuel ratio AL at time t8.
- ammonia NH 3 is produced by the reduction of the NO X, most of the NH 3 thus produced, the NO X catalyst device 11 and the like are adsorbed on the carrier of the NO X catalyst device 11 Stay without.
- the NO X catalyst device 11 In the subsequent air-fuel ratio of the exhaust gas in the NO X catalyst device to end the reproduction process becomes the stoichiometric air-fuel ratio AS (hereinafter t6), for example by oxygen in the exhaust gas, the NO X catalyst device 11 Most of the ammonia is oxidized, and at this time, N 2 O is easily generated (2NH 3 + 2O 2 ⁇ N 2 O + 3H 2 O).
- the second set time period from time t6 in after the air-fuel ratio of the exhaust gas in the NO X catalyst device to end the reproduction process becomes the stoichiometric air-fuel ratio AS until the time t7, N 2 O is produced easy.
- N 2 O reduction to the NO X catalyst device 11 is performed in at least one of the first set period (from time t2 to time t3) and the second set period (from time t6 to time t7), preferably both.
- An agent is supplied to reduce the produced N 2 O to N 2 or NO.
- FIG. 3 is a graph showing the N 2 O reduction rate for each reducing substance.
- the high-boiling HC such as CO and example C 3 H low-boiling HC from e.g. C 10 H 22, such as 6, liable to remain in the NO X catalyst device 11, from the NO X N 2 O which is difficult to reduce can be reduced well.
- the NO X reduction rate is the opposite of the N 2 O reduction rate, and CO and low-boiling HC yield higher reduction rates than high-boiling HC.
- a fuel having a boiling point higher than that of the low boiling reforming HC contained in the exhaust gas of the rich air-fuel ratio combustion at the time of regeneration is used as the N 2 O reducing agent.
- the reduction of NO X, CO is used and a low boiling points reforming HC contained in the exhaust gas of the rich air-fuel ratio combustion.
- Fuel as N 2 O reducing agent for example, to be supplied to the NO X catalyst device 11 together with the exhaust gas after being injected into the cylinder in the expansion stroke (late expansion stroke) or exhaust stroke by the fuel injection valve 8 ing.
- the NO X catalyst device 11 without being modified in a low-boiling HC in the cylinder such as during the combustion, it is supplied to the NO X catalyst device 11 as a fuel of high boiling point.
- the amount of N 2 O reducing agent determined based on the amount of N 2 O generated is divided into all cylinders, and the allocated amount is injected into each cylinder. As necessary, the allocated portion in each cylinder is injected divided into a plurality of cycles.
- the injection starting time of the fuel injection valve 8 is the time t1 And time t2.
- the fuel as the N 2 O reducing agent is injected separately from the fuel injection amount for setting the combustion air-fuel ratio to the set rich air-fuel ratio AR.
- the injection start time is the time t5 of the fuel injection valve 8 and the time It is set between t6.
- the fuel as the N 2 O reducing agent is injected separately from the fuel injection amount for setting the combustion air-fuel ratio to the lean air-fuel ratio AL.
- the fuel of the N 2 O reducing agent to be supplied to the NO X catalyst device 11 together with the exhaust gas after being supplied to the exhaust passage by a fuel supply device 12 disposed immediately upstream of the NO X catalyst device 11 obviously. Thereby, without being reformed to low boiling HC, supplied to the NO X catalyst device 11 as a fuel of high boiling point.
- the amount of the N 2 O reducing agent determined based on the amount of generated N 2 O is supplied continuously or intermittently by the fuel supply device 12.
- the supply start timing of the fuel supply device 12 is time t1 And time t2.
- the fuel as the N 2 O reducing agent is supplied separately from the fuel injection amount for setting the combustion air-fuel ratio to the set rich air-fuel ratio AR.
- the supply start time the time t5 of the fuel supply device 12 and the time It is set between t6.
- the fuel as the N 2 O reducing agent is supplied separately from the fuel injection amount for setting the combustion air-fuel ratio to the lean air-fuel ratio AL.
- the fuel injection valve 8 or the fuel supply device 12 is controlled by the electronic control device.
- the electronic control unit, whether it is regeneration timing of the NO X catalyst device 11 is judged.
- the NO X holding amount of the NO X catalyst device 11 reaches the vicinity of the NO X holding amount, with thoroughly NO X in the exhaust gas Since it can no longer be held, it can be determined that it is the reproduction time.
- downstream NO X concentration sensor detects the concentration of NO X in the exhaust gas flowing into the NO X catalyst device 11 by the upstream NO X concentration sensor, exhaust gas per unit time determined from NO X concentration Assuming that the set ratio of the NO X amount contained in the NO X catalyst device 11 is held per unit time, the current NO X hold amount is estimated by integrating the hold amount per unit time, and this is the set amount It may be determined that the playback time is reached.
- the upstream NO X concentration sensor even without providing, in advance set the amount of NO X contained in the exhaust gas per unit time for each engine operating state, NO X catalyst that setting percentage per unit time Assuming that it is held in the device 11, the holding amount per unit time may be integrated to estimate the current NO X holding amount, and when this reaches the set amount, it may be determined as the regeneration time.
- the air-fuel ratio sensor 13 can monitor the air-fuel ratio of the exhaust gas flowing into the NO X catalyst device 11.
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Toxicology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Exhaust Gas After Treatment (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
しかしながら、このようなNOX触媒装置の再生処理においてN2O(一酸化二窒素又は亜酸化窒素)が生成されることがあり、N2Oも大気中へ放出することは好ましくない。それにより、再生処理時においてNOX触媒装置からのN2Oの流出量を減少させることを意図した内燃機関の排気浄化装置が提案されている(例えば、特許文献1参照)。
しかしながら、こうして再生処理時に燃焼空燃比をリッチ空燃比とすると、排気ガス中の酸素濃度の低下により再生処理中のN2Oの生成量を全体的には減少させることができるが、一時的にN2Oが多量に生成されることがあり、再生処理に伴うN2Oの流出量を十分に減少させることができない。
従って、本発明の目的は、排気ガス中の酸素濃度が高い時には排気ガス中のNOXを良好に保持し、再生処理として、排気ガス中の酸素濃度を低下させれば、保持したNOXを離脱し、こうして離脱させたNOXを排気ガス中の還元物質によりN2へ還元浄化することができるNOX触媒装置を具備する内燃機関の排気浄化装置において、燃焼空燃比をリッチ空燃比とする再生処理に伴ってNOX触媒装置から流出するN2Oの流出量を十分に減少させることである。
本発明による請求項2に記載の内燃機関の排気浄化装置は、請求項1に記載の内燃機関の排気浄化装置において、前記第一設定期間は、前記再生処理を開始するために燃焼空燃比を前記リーン空燃比から前記設定リッチ空燃比へ変化させた時から第一設定時間経過した時に開始するように設定されていることを特徴とする。
本発明による請求項3に記載の内燃機関の排気浄化装置は、請求項1に記載の内燃機関の排気浄化装置において、前記第二設定期間は、前記再生処理を終了するために燃焼空燃比を前記設定リッチ空燃比からリーン空燃比へ変化させた時から第二設定時間経過した時に開始するように設定されていることを特徴とする。
本発明による請求項4に記載の内燃機関の排気浄化装置は、請求項1から3のいずれか一項に記載の内燃機関の排気浄化装置において、前記N2O還元剤は、再生処理時の排気ガス中に含まれる低沸点化改質HCより高沸点の燃料であることを特徴とする。
本発明による請求項5に記載の内燃機関の排気浄化装置は、請求項4に記載の内燃機関の排気浄化装置において、前記N2O還元剤は、膨張行程又は排気行程において気筒内へ供給された後に排気ガスと共に前記NOX触媒装置へ供給されることを特徴とする。
本発明による請求項6に記載の内燃機関の排気浄化装置は、請求項4に記載の内燃機関の排気浄化装置において、前記N2O還元剤は、前記NOX触媒装置の上流側の排気通路に供給された後に排気ガスと共に前記NOX触媒装置へ供給されることを特徴とする。
本発明による請求項2に記載の内燃機関の排気浄化装置によれば、請求項1に記載の内燃機関の排気浄化装置において、第一設定期間は、再生処理を開始するために燃焼空燃比をリーン空燃比から設定リッチ空燃比へ変化させた時から第一設定時間経過した時に開始するように設定されており、第一設定時間を考慮して第一設定期間においてNOX触媒装置へN2O還元剤を供給することができる。
本発明による請求項3に記載の内燃機関の排気浄化装置によれば、請求項1に記載の内燃機関の排気浄化装置において、第二設定期間は、再生処理を終了するために燃焼空燃比を設定リッチ空燃比からリーン空燃比へ変化させた時から第二設定時間経過した時に開始するように設定されており、第二設定時間を考慮して第二設定期間においてNOX触媒装置へN2O還元剤を供給することができる。
本発明による請求項4に記載の内燃機関の排気浄化装置によれば、請求項1から3のいずれか一項に記載の内燃機関の排気浄化装置において、N2O還元剤は、再生処理時の排気ガス中に含まれる低沸点化改質HCより高沸点の燃料であり、このような高沸点燃料は、低沸点改質HCよりNOX触媒装置内に残留し易く、NOXより還元させ難いN2Oを良好に還元することができる。
本発明による請求項5に記載の内燃機関の排気浄化装置によれば、請求項4に記載の内燃機関の排気浄化装置において、N2O還元剤は、膨張行程又は排気行程において気筒内へ供給された後に排気ガスと共にNOX触媒装置へ供給されるようになっており、燃焼空燃比をリーン空燃比から設定リッチ空燃比とする再生処理時の排気ガス中に含まれる低沸点化改質HCのように改質されることなく、高沸点の燃料としてNOX触媒装置へ供給することができる。
本発明による請求項6に記載の内燃機関の排気浄化装置によれば、請求項4に記載の内燃機関の排気浄化装置において、N2O還元剤は、NOX触媒装置の上流側の排気通路に供給された後に排気ガスと共に前記NOX触媒装置へ供給されるようになっており、燃焼空燃比をリーン空燃比から設定リッチ空燃比とする再生処理時の排気ガス中に含まれる低沸点化改質HCのように改質されることなく、高沸点の燃料としてNOX触媒装置へ供給することができる。
ディーゼルエンジン又は筒内噴射式火花点火内燃機関のような希薄燃焼を実施する内燃機関1の排気ガス中には、比較的多くのNOXが含まれるために、排気通路10には、NOXを浄化するためのNOX触媒装置11が配置されている。排気通路10のNOX触媒装置11の直上流側には、燃料を供給するための燃料供給装置12が配置されている。13はNOX触媒装置11へ流入する排気ガスの空燃比を検出するための空燃比センサである。
NOX触媒装置11には、NOX保持剤と白金Ptのような貴金属触媒とが担持されている。NOX保持剤は、カリウムK、ナトリウムNa、リチウムLi、セシウムCsのようなアルカリ金属、バリウムBa、カルシウムCaのようなアルカリ土類、ランタンLa、イットリウムYのような希土類から選ばれた少なくとも一つである。
NOX触媒装置11は、排気ガスがリーン空燃比である時、すなわち、排気ガス中の酸素濃度が高い時に、排気ガス中のNOXを良好に保持し、すなわち、硝酸塩として良好に吸収したり、NO2として良好に吸着したりする。しかしながら、無制限にNOXを保持することはできず、NOX保持量がNOX保持可能量に達してさらにNOXを保持することができなくなる前に、再生処理として、排気ガスの空燃比をリッチ空燃比とし、すなわち、排気ガス中の酸素濃度を低下させる。それにより、保持NOXは離脱され、すなわち、吸収NOXは放出され、また、吸着NO2は脱離され、これら離脱NOXは排気ガス中の還元物質によりN2へ還元浄化される。
再生処理を開始するためには、圧縮行程において燃料噴射弁8により噴射される燃料を増量して、又は、膨張行程初期の燃焼中において燃料噴射弁8により追加燃料を噴射して、燃焼空燃比を通常運転のリーン空燃比から設定リッチ空燃比へ切り換えることによって、NOX触媒装置11へ設定リッチ空燃比の排気ガスを流入させる。予め定められた再生処理時間が経過してほぼ全ての保持NOXをNOX触媒装置11から離脱させた時には、再生処理を終了するために、燃焼空燃比を設定リッチ空燃比から通常運転のリーン空燃比へ戻すこととなる。もちろん、再生処理の実施前後のリーン空燃比は運転状態によって必ずしも同じにならないことがある。再生処理において、圧縮行程の増量燃料噴射は連続噴射でも二又は三分割のような複数の分割噴射でも良く、また、膨張行程初期の追加燃料は圧縮行程末期の燃料噴射に連続しても不連続でも良い。
このような再生処理に伴って、NOX触媒装置11においてN2O(一酸化二窒素又は亜酸化窒素)が生成されることがある。N2Oの大気放出は好ましくないために、NOX触媒装置11からのN2Oの流出量を低減することが必要である。
図2は、再生処理時のNOX触媒装置11内の空燃比A変化と、N2O生成量M変化とを示すタイムチャートである。図2において、時刻t1は、燃焼空燃比をリーン空燃比AL(例えば22)から設定リッチ空燃比AR(例えば12)へ切り換えた再生処理制御の開始時刻である。燃焼空燃比がリッチ空燃比ARとされても、NOX触媒装置11内の空燃比Aは、排気マニホルド9及びNOX触媒装置11の上流側の排気通路10内を満たすリーン空燃比ALの排気ガスによって、直ぐにはリッチ空燃比ARとはならず、リーン空燃比ALからリッチ側へ徐々に変化し、時刻t4において設定リッチ空燃比ARとなる。
こうして、再生処理を開始するためにNOX触媒装置11内の排気ガスの空燃比がリーン空燃比ALから設定リッチ空燃比ARとなるまでの間(時刻t1からt4)における時刻t2から時刻t3までの第一設定期間はNOX触媒装置11へ流入する排気ガスの空燃比が理論空燃比AS(例えば14.7)近傍(例えば18から14)となって離脱NOX及び排気ガス中のNOXは十分に還元されずにN2Oが生成され易い(NO+N→N2O)。このように、燃焼空燃比をリーン空燃比ALから設定リッチ空燃比ARへ切り換えた再生処理制御開始時刻t1から第一設定時間経過した時に時刻t2となって第一設定期間が開始される。第一設定時間は、排気マニホルド9及びNOX触媒装置11の上流側の排気通路10の容積が小さいほど短くなり、リーン空燃比ALと理論空燃比ASとの差が小さいほど短くなり、また、理論空燃比ASと設定リッチ空燃比ARとの差が大きいほど短くなる。
また、時刻t5は、燃焼空燃比を設定リッチ空燃比ARからリーン空燃比ALへ切り換えた再生処理制御の終了時刻である。燃焼空燃比がリーン空燃比ALとされても、NOX触媒装置11内の空燃比Aは、排気マニホルド9及びNOX触媒装置11の上流側の排気通路10内を満たす設定リッチ空燃比ARの排気ガスによって、直ぐにはリーン空燃比ALとはならず、リッチ空燃比ARからリーン側へ徐々に変化し、時刻t8においてリーン空燃比ALとなる。
ところで、再生処理中において、NOXの還元によりアンモニアNH3が生成され、こうして生成されたNH3の殆どは、NOX触媒装置11の担体に吸着される等してNOX触媒装置11から流出することなく留まる。
それにより、再生処理を終了するためにNOX触媒装置内の排気ガスの空燃比が理論空燃比ASとなった以降(t6以降)において、例えば排気ガス中の酸素により、NOX触媒装置11内のアンモニアは、ほぼ全て酸化され、この際にN2Oが生成され易い(2NH3+2O2→N2O+3H2O)。このように、再生処理を終了するためにNOX触媒装置内の排気ガスの空燃比が理論空燃比ASとなった以降における時刻t6から時刻t7までの第二設定期間はN2Oが生成され易い。ここで、再生処理中に生成されたアンモニア量が多い場合には、第二設定期間の終了時刻t7はNOX触媒装置内の排気ガスの空燃比がリーン空燃比ALとなる時刻t8より後になることもある。このように、燃焼空燃比を設定リッチ空燃比ARからリーン空燃比ALへ切り換えた再生処理制御終了時刻t5から第二設定時間経過した時に時刻t6となって第二設定期間が開始される。第二設定時間は、排気マニホルド9及びNOX触媒装置11の上流側の排気通路10の容積が小さいほど短くなり、理論空燃比ASと設定リッチ空燃比ARとの差が小さいほど短くなり、また、リーン空燃比ALと理論空燃比ASとの差が大きいほど短くなる。
本実施形態においては、第一設定期間(時刻t2から時刻t3まで)及び第二設定期間(時刻t6から時刻t7まで)の少なくとも一方、好ましくは両方において、NOX触媒装置11へN2O還元剤を供給して、生成されたN2OをN2又はNO等に還元するようにしている。それにより、再生処理に伴ってNOX触媒装置11から流出するN2Oの流出量を十分に低減することができる。N2O還元剤の量は、第一設定期間及び第二設定期間においてそれぞれ生成されるN2O量が多いほど多くすることが好ましい。
図3は、還元物質毎のN2O還元率を示すグラフである。図3に示すように、COや例えばC3H6のような低沸点HCより例えばC10H22のような高沸点HCの方が、NOX触媒装置11内に残留し易く、NOXより還元させ難いN2Oを良好に還元することができる。NOX還元率は、N2O還元率とは逆の結果となり、COや低沸点HCの方が高沸点HCより高い還元率をもたらす。
それにより、本実施形態では、N2O還元剤として、再生処理時のリッチ空燃比燃焼の排気ガス中に含まれる低沸点化改質HCより高沸点の燃料を使用する。一方、NOXの還元には、リッチ空燃比燃焼の排気ガス中に含まれるCO及び低沸点化改質HCを使用する。
N2O還元剤としての燃料は、例えば、燃料噴射弁8により膨張行程(膨張行程後半)又は排気行程において気筒内へ噴射された後に排気ガスと共にNOX触媒装置11へ供給されるようになっている。こうして、燃焼時のように気筒内で低沸点HCに改質されることなく、高沸点の燃料としてNOX触媒装置11へ供給される。生成されるN2O量に基づき定められたN2O還元剤の量は全気筒に分割され、各気筒において割り当て分が噴射される。必要に応じて、各気筒において割り当て分は複数のサイクルに分割して噴射される。
この場合において、第一設定期間(t2からt3まで)においてN2O還元剤としての燃料が排気ガスと共にNOX触媒装置11へ供給されるように、燃料噴射弁8の噴射開始時刻が時刻t1と時刻t2との間に設定される。このN2O還元剤としての燃料は、燃焼空燃比を設定リッチ空燃比ARとするための燃料噴射量とは別に噴射される。
また、第二設定期間(t6からt7まで)においてN2O還元剤としての燃料が排気ガスと共にNOX触媒装置11へ供給されるように、燃料噴射弁8の噴射開始時刻が時刻t5と時刻t6との間に設定される。このN2O還元剤としての燃料は、燃焼空燃比をリーン空燃比ALとするための燃料噴射量とは別に噴射される。
また、N2O還元剤としての燃料は、NOX触媒装置11の直上流側に配置された燃料供給装置12により排気通路に供給された後に排気ガスと共にNOX触媒装置11へ供給されるようにしても良い。それにより、低沸点HCに改質されることなく、高沸点の燃料としてNOX触媒装置11へ供給される。生成されるN2O量に基づき定められたN2O還元剤の量は燃料供給装置12により連続的又は間欠的に供給される。
この場合において、第一設定期間(t2からt3まで)においてN2O還元剤としての燃料が排気ガスと共にNOX触媒装置11へ供給されるように、燃料供給装置12の供給開始時期が時刻t1と時刻t2との間に設定される。このN2O還元剤としての燃料は、燃焼空燃比を設定リッチ空燃比ARとするための燃料噴射量とは別に供給される。
また、第二設定期間(t6からt7まで)においてN2O還元剤としての燃料が排気ガスと共にNOX触媒装置11へ供給されるように、燃料供給装置12の供給開始時刻が時刻t5と時刻t6との間に設定される。このN2O還元剤としての燃料は、燃焼空燃比をリーン空燃比ALとするための燃料噴射量とは別に供給される。
このように、燃料噴射弁8又は燃料供給装置12は、電子制御装置により制御される。電子制御装置において、NOX触媒装置11の再生時期であるか否かが判断される。例えば、NOX触媒装置11の直上流側に上流側NOX濃度センサを設けると共にNOX触媒装置11の直下流側に下流側NOX濃度センサを設けて、NOX触媒装置11へ流入する排気ガス中のNOX濃度とNOX触媒装置11から流出する排気ガス中のNOX濃度とを検出し、NOX触媒装置11へ流入する排気ガス中のNOX濃度とNOX触媒装置11から流出する排気ガス中のNOX濃度との差が設定値を下回る時に、NOX触媒装置11のNOX保持量は、NOX保持可能量近傍に到達して、排気ガス中のNOXを十分に保持することができなくなったとして、再生時期と判断することができる。
また、下流側NOX濃度センサを設けることなく、上流側NOX濃度センサによりNOX触媒装置11へ流入する排気ガス中のNOX濃度を検出し、NOX濃度から定まる単位時間当たりの排気ガス中に含まれるNOX量の設定割合が単位時間当たりにNOX触媒装置11へ保持されるとして、単位時間当たりの保持量を積算して現在のNOX保持量を推定し、これが設定量に達した時に再生時期と判断するようにしても良い。また、上流側NOX濃度センサも設けることなく、機関運転状態毎の単位時間当たりの排気ガス中に含まれるNOX量を予め設定しておいて、その設定割合が単位時間当たりにNOX触媒装置11へ保持されるとして、単位時間当たりの保持量を積算して現在のNOX保持量を推定し、これが設定量に達した時に再生時期と判断するようにしても良い。
空燃比センサ13によりNOX触媒装置11へ流入する排気ガスの空燃比を監視することができる。
11 NOX触媒装置
12 燃料供給装置
Claims (6)
- 排気ガス中の酸素濃度が高い時には排気ガス中のNOXを保持し、再生処理として、排気ガス中の酸素濃度を低下させれば、保持したNOXを離脱し、こうして離脱させたNOXを排気ガス中の還元物質によりN2へ還元浄化することができるNOX触媒装置を具備する内燃機関の排気浄化装置において、前記再生処理は燃焼空燃比をリーン空燃比から設定リッチ空燃比へ変化させることにより実施され、前記再生処理を開始するために前記NOX触媒装置内の排気ガスの空燃比が前記リーン空燃比から前記設定リッチ空燃比となるまでの間における第一設定期間、及び、前記再生処理を終了するために前記NOX触媒装置内の排気ガスの空燃比が理論空燃比となった以降における第二設定期間の少なくとも一方において、前記NOX触媒装置へN2O還元剤を供給することを特徴とする内燃機関の排気浄化装置。
- 前記第一設定期間は、燃焼空燃比を前記リーン空燃比から前記設定リッチ空燃比へ変化させた時から第一設定時間経過した時に開始するように設定されていることを特徴とする請求項1に記載の内燃機関の排気浄化装置。
- 前記第二設定期間は、燃焼空燃比を前記設定リッチ空燃比からリーン空燃比へ変化させた時から第二設定時間経過した時に開始するように設定されていることを特徴とする請求項1に記載の内燃機関の排気浄化装置。
- 前記N2O還元剤は、再生処理時の排気ガス中に含まれる低沸点化改質HCより高沸点の燃料であることを特徴とする請求項1から3のいずれか一項に記載の内燃機関の排気浄化装置。
- 前記N2O還元剤は、膨張行程又は排気行程において気筒内へ供給された後に排気ガスと共に前記NOX触媒装置へ供給されることを特徴とする請求項4に記載の内燃機関の排気浄化装置。
- 前記N2O還元剤は、前記NOX触媒装置の上流側の排気通路に供給された後に排気ガスと共に前記NOX触媒装置へ供給されることを特徴とする請求項4に記載の内燃機関の排気浄化装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/673,888 US8434297B2 (en) | 2009-06-15 | 2009-06-15 | Exhaust purification system of internal combustion engine |
PCT/JP2009/061252 WO2010146718A1 (ja) | 2009-06-15 | 2009-06-15 | 内燃機関の排気浄化装置 |
JP2010501723A JP4911245B2 (ja) | 2009-06-15 | 2009-06-15 | 内燃機関の排気浄化装置 |
CN2009801002478A CN101981283B (zh) | 2009-06-15 | 2009-06-15 | 内燃机的排气净化装置 |
EP09846211.2A EP2444610B1 (en) | 2009-06-15 | 2009-06-15 | Exhaust emission control device for internal combustion engine |
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PCT/JP2009/061252 WO2010146718A1 (ja) | 2009-06-15 | 2009-06-15 | 内燃機関の排気浄化装置 |
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PCT/JP2009/061252 WO2010146718A1 (ja) | 2009-06-15 | 2009-06-15 | 内燃機関の排気浄化装置 |
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US (1) | US8434297B2 (ja) |
EP (1) | EP2444610B1 (ja) |
JP (1) | JP4911245B2 (ja) |
CN (1) | CN101981283B (ja) |
WO (1) | WO2010146718A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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GB2490940A (en) * | 2011-05-19 | 2012-11-21 | Gm Global Tech Operations Inc | Method for operating a lean NOx trap |
Families Citing this family (5)
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CA2879957C (en) * | 2012-07-27 | 2017-02-14 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas control apparatus for internal combustion engine |
US10221792B2 (en) | 2013-08-15 | 2019-03-05 | Ford Global Technologies, Llc | Two-stage catalyst regeneration |
JP2016061145A (ja) | 2014-09-12 | 2016-04-25 | いすゞ自動車株式会社 | 排気浄化システム |
US10774771B2 (en) * | 2016-03-04 | 2020-09-15 | Ge Global Sourcing Llc | Engine control system for reducing particulate matter |
JP6512200B2 (ja) * | 2016-09-30 | 2019-05-15 | トヨタ自動車株式会社 | 内燃機関の排気浄化システム |
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- 2009-06-15 CN CN2009801002478A patent/CN101981283B/zh not_active Expired - Fee Related
- 2009-06-15 EP EP09846211.2A patent/EP2444610B1/en not_active Not-in-force
- 2009-06-15 US US12/673,888 patent/US8434297B2/en active Active
- 2009-06-15 JP JP2010501723A patent/JP4911245B2/ja not_active Expired - Fee Related
- 2009-06-15 WO PCT/JP2009/061252 patent/WO2010146718A1/ja active Application Filing
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JP2001012231A (ja) * | 1999-06-29 | 2001-01-16 | Toyota Central Res & Dev Lab Inc | 排気浄化装置 |
JP2004211676A (ja) * | 2002-11-11 | 2004-07-29 | Toyota Motor Corp | 内燃機関の排気浄化装置 |
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GB2490940A (en) * | 2011-05-19 | 2012-11-21 | Gm Global Tech Operations Inc | Method for operating a lean NOx trap |
Also Published As
Publication number | Publication date |
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JP4911245B2 (ja) | 2012-04-04 |
JPWO2010146718A1 (ja) | 2012-11-29 |
CN101981283A (zh) | 2011-02-23 |
CN101981283B (zh) | 2012-11-07 |
EP2444610A1 (en) | 2012-04-25 |
EP2444610B1 (en) | 2014-05-28 |
EP2444610A4 (en) | 2012-11-21 |
US8434297B2 (en) | 2013-05-07 |
US20110209462A1 (en) | 2011-09-01 |
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