US20100037596A1 - Exhaust purification device of compression ignition type internal combustion engine - Google Patents
Exhaust purification device of compression ignition type internal combustion engine Download PDFInfo
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- US20100037596A1 US20100037596A1 US12/312,785 US31278508A US2010037596A1 US 20100037596 A1 US20100037596 A1 US 20100037596A1 US 31278508 A US31278508 A US 31278508A US 2010037596 A1 US2010037596 A1 US 2010037596A1
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- selective reducing
- reducing catalyst
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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
- F01N3/0814—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
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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
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
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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
- B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
- B01D53/9477—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on separate bricks, e.g. exhaust systems
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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
- B01D53/9495—Controlling the catalytic process
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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
- B01D53/96—Regeneration, reactivation or recycling of reactants
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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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
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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
- F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
- F01N3/106—Auxiliary oxidation catalysts
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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
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2033—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using a fuel burner or introducing fuel into exhaust duct
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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
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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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
- F01N9/00—Electrical control of exhaust gas treating apparatus
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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
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
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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
- B01D2251/21—Organic compounds not provided for in groups B01D2251/206 or B01D2251/208
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/10—Noble metals or compounds thereof
- B01D2255/102—Platinum group metals
- B01D2255/1021—Platinum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20738—Iron
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/50—Zeolites
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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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
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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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
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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
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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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
- 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
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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
- Y02T10/40—Engine management systems
Definitions
- the present invention relates to an exhaust purification device of a compression ignition type internal combustion engine.
- Known in the art is an internal combustion engine arranging an NO x selective reducing catalyst in an engine exhaust passage, arranging an oxidation catalyst in the engine exhaust passage upstream of the NO x selective reducing catalyst, feeding urea to the NO x selective reducing catalyst, and using the ammonia produced from the urea to selectively reduce the NO x contained in the exhaust gas (for example, see Japanese Patent Publication (A) No. 2005-23921).
- the NO x selective reducing catalyst adsorbs ammonia and the adsorbed ammonia reacts with the NO x contained in the exhaust gas whereby the NO x is reduced.
- An object of the present invention is to provide an exhaust purification device of a compression ignition type internal combustion engine capable of obtaining a good NO x purification rate at engine startup.
- an exhaust purification device of a compression ignition type internal combustion engine arranging an NO x selective reducing catalyst in an engine exhaust passage, arranging an oxidation catalyst in the engine exhaust passage upstream of the NO x selective reducing catalyst, feeding urea to the NO x selective reducing catalyst, and using an ammonia produced from the urea to selectively reduce NO x contained in the exhaust gas, wherein HC is fed to the oxidation catalyst at the time of engine startup to raise a temperature of the NO x selective reducing catalyst with a heat of oxidation reaction of HC, and at this time, the temperature of the NO x selective reducing catalyst is increased to a HC desorption temperature range where HC is desorbed from the NO x selective reducing catalyst.
- Increasing the temperature of the NO x selective reducing catalyst to the HC desorption temperature range eliminates the HC poisoning of the NO x selective reducing catalyst and thereby gives a good NO x purification rate.
- FIG. 1 is an overview of a compression ignition type internal combustion engine
- FIG. 2 is an overview showing another embodiment of the compression ignition type internal combustion engine
- FIG. 3 is a view showing an oxidation rate and desorption rate
- FIG. 4 is a time chart showing warm-up control
- FIG. 5 is a flow chart for performing the warm-up control.
- FIG. 1 shows an overview of a compression ignition type internal combustion engine.
- 1 indicates an engine body, 2 a combustion chamber of a cylinder, 3 an electronic control type fuel injector for injecting fuel into each combustion chamber 2 , 4 an intake manifold, and 5 an exhaust manifold.
- the intake manifold 4 is connected through an intake duct 6 to the outlet of a compressor 7 a of an exhaust turbocharger 7 , while the inlet of the compressor 7 a is connected through an intake air amount detector 8 to an air cleaner 9 .
- a throttle valve 10 driven by a step motor is arranged inside the intake duct 6 .
- a cooling device 11 for cooling the intake air flowing through the inside of the intake duct 6 is arranged. In the embodiment shown in FIG. 1 , the engine cooling water is guided to the cooling device 11 where the engine cooling water cools the intake air.
- the exhaust manifold 5 is connected to the inlet of an exhaust turbine 7 b of the exhaust turbocharger 7 , while the outlet of the exhaust turbine 7 b is connected to the inlet of an oxidation catalyst 12 .
- a particulate filter 13 is arranged adjacent to the oxidation catalyst 12 for collecting particulate matter contained in the exhaust gas, while the outlet of this particulate filter 13 is connected through an exhaust pipe 14 to the inlet of an NO x selective reducing catalyst 15 .
- the outlet of this NO x selective reducing catalyst 15 is connected to an oxidation catalyst 16 .
- an aqueous urea solution feed valve 17 is arranged inside an exhaust pipe 14 upstream of the NO x selective reducing catalyst 15 .
- This aqueous urea solution feed valve 17 is connected through a feed pipe 18 and a feed pump 19 to an aqueous urea solution tank 20 .
- the aqueous urea solution stored inside the aqueous urea solution tank 20 is injected by the feed pump 19 into the exhaust gas flowing within the exhaust pipe 14 from the aqueous urea solution feed valve 17 , while the ammonia ((NH 2 ) 2 CO+H 2 O 2 NH 3 +CO 2 ) generated from urea causes the NO x contained in the exhaust gas to be reduced in the NO x selective reducing catalyst 15 .
- the exhaust manifold 5 and the intake manifold 4 are connected to each other through an exhaust gas recirculation (hereinafter referred to as the “EGR”) passage 21 .
- EGR exhaust gas recirculation
- an electronic control type EGR control valve 22 Inside the EGR passage 21 is arranged an electronic control type EGR control valve 22 .
- a cooling device 23 for cooling the EGR gas flowing through the inside of the EGR passage 21 .
- the engine cooling water is guided through the cooling device 23 , where the engine cooling water is used to cool the EGR gas.
- each fuel injector 3 is connected through a fuel feed pipe 24 to a common rail 25 .
- This common rail 25 is connected through an electronically controlled variable discharge fuel pump 26 to a fuel tank 27 .
- the fuel stored in the fuel tank 27 is fed by the fuel pump 26 into the common rail 25 , and the fuel fed to the inside of the common rail 25 is fed through each fuel pipe 24 to the fuel injectors 3 .
- an HC feed valve 28 for feeding hydrocarbons, i.e., HC into the exhaust manifold 5 is arranged in the exhaust manifold 5 .
- this HC is comprised of diesel oil.
- An electronic control unit 30 is comprised of a digital computer provided with a ROM (read only memory) 32 , RAM (random access memory) 33 , CPU (microprocessor) 34 , input port 35 , and output port 36 all connected to each other by a bi-directional bus 31 .
- a temperature sensor 45 for detecting the bed temperature of the oxidation catalyst 12 is attached to the oxidation catalyst 12
- a temperature sensor 46 for detecting the bed temperature of the NO x selective reducing catalyst 15 is attached to the NO x selective reducing catalyst 15 .
- the output signals of these temperature sensors 45 and 46 and intake air amount detector 8 are input through corresponding AD converters 37 into the input port 35 .
- the accelerator pedal 40 has a load sensor 41 generating an output voltage proportional to the amount of depression L of the accelerator pedal 40 connected to it.
- the output voltage of the load sensor 41 is input through a corresponding AD converter 37 to the input port 35 .
- the input port 35 has a crank angle sensor 42 generating an output pulse each time the crank shaft rotates by for example 15° C. connected to it.
- the output port 36 is connected through corresponding drive circuits 38 to the fuel injectors 3 , throttle valve 10 drive step motor, aqueous urea solution feed valve 17 , feed pump 19 , EGR control valve 22 , fuel pump 26 , and HC feed valve 28 .
- the oxidation catalyst 12 for example, carries a precious metal catalyst such as platinum.
- This oxidation catalyst 12 performs the action of converting the NO contained in the exhaust gas to NO 2 and the action of oxidizing the HC contained in the exhaust gas. That is, NO 2 has stronger oxidation properties than NO. Therefore, if NO is converted to NO 2 , the oxidation reaction of the particulate matter trapped on the particulate filter 13 is promoted. Further, the reduction action by the ammonia at the NO x selective reducing catalyst 15 is promoted.
- the NO x selective reducing catalyst 15 as explained above, if HC is deposited, the adsorption amount of the ammonia will decrease, therefore the NO x purification rate will fall. Accordingly, by using the oxidation catalyst 12 to oxidize the HC, the deposition of HC at the NO x selective reducing catalyst 15 , that is, the HC poisoning of the NO x selective reducing catalyst 15 , is avoided.
- a particulate filter not carrying a catalyst may be used.
- a particulate filter carrying, for example, a precious metal catalyst such as platinum may be used.
- the NOX selective reducing catalyst 15 is comprised of an ammonia adsorption type Fe zeolite having a high NO x purification rate at low temperatures.
- the oxidation catalyst 16 carries, for example, a precious metal catalyst comprised of platinum, and this oxidation catalyst 16 performs an action of oxidizing ammonia leaked from the NO x selective reducing catalyst 15 .
- FIG. 2 shows another embodiment of the compression ignition type internal combustion engine.
- the particulate filter 13 is arranged downstream of the oxidation catalyst 16 , accordingly, in this embodiment, the outlet of the oxidation catalyst 12 is coupled through the exhaust pipe 14 to the inlet of the NO x selective reducing catalyst 15 .
- HC is fed to the oxidation catalyst 12 at the time of engine startup so as to raise the temperature of the NO x selective reducing catalyst 15 with the heat of oxidation reaction of HC.
- the feed of the HC may be performed, for example, by injecting fuel into the combustion chamber 2 during the exhaust stroke or by feeding HC into the engine exhaust passage.
- the HC is fed by injecting diesel fuel from the HC feed valve 28 .
- FIG. 3(A) shows the relation between the bed temperature T 0 of the oxidation catalyst 12 and the oxidation rate M 0 (g/sec) of the HC, that is, the amount of HC able to be oxidized per unit time.
- the oxidation catalyst 12 upon activation of the oxidation catalyst 12 , when the amount of HC flowing into the oxidation catalyst 12 per unit time is lower than the oxidation rate M 0 determined from the bed temperature T 0 of the oxidation catalyst 12 , all of the inflowing HC is oxidized in the oxidation catalyst 12 , and when the amount of HC flowing into the oxidation catalyst 12 per unit time is greater than the oxidation rate M 0 determined from the bed temperature of the oxidation catalyst 12 , the amount by which the HC exceeds the oxidation rate M 0 will slip the oxidation catalyst 12 .
- the HC slipping the oxidation catalyst 12 will flow into the NO x selective reducing catalyst 15 and deposit on the NO x selective reducing catalyst 15 .
- this deposited HC may be desorbed from the NO x selective reducing catalyst 15 by raising the temperature of the NO x selective reducing catalyst 15 . This will be explained while referring to FIG. 3(B) .
- FIG. 3(B) shows the relation between the bed temperature Tn of the NO x selective reducing catalyst 15 and the desorption rate Md(g/sec) of the HC, that is, the amount of HC desorbed from the NO x selective reducing catalyst 15 per unit time.
- the desorption rate Md rises.
- the approximately 350° C. indicated by TF becomes the desorption start temperature. Accordingly, by raising the bed temperature Tn of the NO x selective reducing catalyst 15 to the desorption start temperature TF or above, HC can be desorbed from the NO x selective reducing catalyst 15 .
- a large amount of HC may be fed from the HC feed valve 28 .
- HC will slip the oxidation catalyst 12 and the NO x selective reducing catalyst 15 will be poisoned by HC.
- raising the temperature of the NO x selective reducing catalyst 15 to an HC desorption temperature range greater than the desorption start temperature TF HC poisoning can be eliminated. Accordingly, in the present invention, the temperature of the NO x selective reducing catalyst 15 at the time of engine startup will be raised to the HC desorption temperature range where HC is desorbed from the NO x selective reducing catalyst 15 .
- HC feed from the HC feed valve 28 will begin. Fluctuation in the HC feed amount is indicated as G I . That is, the HC feed amount G I is reduced little by little so that the bed temperature T 0 of the oxidation catalyst 12 approaches the target temperature smoothly.
- the HC feed amount G I is large, so a large amount of HC will slip the oxidation catalyst 12 , but the more the bed temperature T 0 of the oxidation catalyst 12 rises, the more the HC amount oxidized in the oxidation catalyst 12 , so, as shown in FIG. 4 , the slipped HC amount W will gradually decrease along with the elapse of time.
- the NO x selective reducing catalyst 15 is heated by the exhaust gas raised in temperature in the oxidation catalyst 12 , so, as shown by the solid line in FIG. 4 , its temperature will rise slower than the oxidation catalyst 12 .
- the bed temperature Tn of the NO x selective reducing catalyst 15 is lower than the desorption start temperature TF, the slipped HC amount W will be added to the HC deposition amount ⁇ HC, whereby the deposition amount ⁇ HC will gradually increase.
- the bed temperature Tn of the NO x selective reducing catalyst 15 exceeds the desorption start temperature TF, the desorption action of the HC from the NO x selective reducing catalyst 15 will begin, whereby the HC deposition amount ⁇ HC will gradually decrease.
- the feed of HC is stopped. That is, in this embodiment, the HC amount deposited on the NO x selective reducing catalyst 15 is calculated and the feed of HC is stopped when the calculated HC amount ⁇ HC becomes less than the predetermined set value HCX.
- the change of the bed temperature Tn of the NO x selective reducing catalyst 15 shown by the broken line in FIG. 4 shows the change at the time of conventional temperature raising control.
- T f the convergence temperature which the temperature of the NO x selective reducing catalyst 15 ultimately converges to.
- This convergence temperature T f is approximately 200° C. to 250° C.
- the bed temperature Tn of the NO x selective reducing catalyst 15 is changed to smoothly increase towards the convergence temperature T f .
- the bed temperature Tn of the NO x selective reducing catalyst 15 at the time of engine startup is raised to a temperature of 350° C. at least 100° C. higher than the convergence temperature T f .
- step 50 the exhaust HC amount G 0 is calculated.
- the exhaust HC amount G 0 changing based on the operation state of the engine is stored in advance in the ROM 32 .
- step 51 it is judged whether the bed temperature T 0 of the oxidation catalyst 12 exceeds the activation temperature TX.
- T 0 ⁇ TF the routine proceeds to step 52 , where the slipped amount W is made the exhaust HC amount G 0 , then the routine proceeds to step 59 .
- step 53 the routine proceeds to step 53 , where the HC feed amount G I is calculated.
- step 54 feed control for the HC from the HC feed valve 28 is performed.
- step 55 the oxidation rate M 0 , as shown in FIG. 3(A) , is calculated based on the bed temperature T 0 of the oxidation catalyst 12 .
- step 56 it is judged whether the oxidation rate M 0 is larger than the sum (G 0 +G 1 ) of the exhaust HC amount G 0 and the fed HC amount G 1 .
- step 57 When M 0 ⁇ G 0 +G 1 , the routine proceeds to step 57 , where the slipped amount W is made 0, then the routine proceeds to step 59 . As opposed to this, when the M 0 ⁇ G 0 +G 1 , the routine proceeds to step 58 , where the slipped amount is made G 0 +G 1 ⁇ M 0 , then the routine proceeds to step 59 .
- the desorption rate Md shown in FIG. 3(B) is calculated based on the bed temperature Tn of the NO x selective reducing catalyst 15 .
- the slipped amount W is added to the HC deposition amount ⁇ HC and the desorption rate Md is subtracted from the HC deposition amount ⁇ HC to calculate the HC deposition amount ⁇ HC.
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Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP2007-070020 | 2007-03-19 | ||
JP2007070020A JP4702310B2 (ja) | 2007-03-19 | 2007-03-19 | 圧縮着火式内燃機関の排気浄化装置 |
PCT/JP2008/055615 WO2008114885A1 (fr) | 2007-03-19 | 2008-03-18 | Appareil de purification des gaz d'échappement pour un moteur à combustion interne à allumage par compression |
Publications (1)
Publication Number | Publication Date |
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US20100037596A1 true US20100037596A1 (en) | 2010-02-18 |
Family
ID=39765983
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/312,785 Abandoned US20100037596A1 (en) | 2007-03-19 | 2008-03-18 | Exhaust purification device of compression ignition type internal combustion engine |
Country Status (6)
Country | Link |
---|---|
US (1) | US20100037596A1 (fr) |
EP (1) | EP2123875B1 (fr) |
JP (1) | JP4702310B2 (fr) |
CN (1) | CN101600862B (fr) |
AT (1) | ATE555282T1 (fr) |
WO (1) | WO2008114885A1 (fr) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120036839A1 (en) * | 2010-08-10 | 2012-02-16 | Gm Global Technology Operations, Inc. | Vehicle oxidation catalyst efficiency model for adaptive control and diagnostics |
US8806851B2 (en) | 2007-09-28 | 2014-08-19 | Daimler Ag | Method for reducing emission of nitrogen oxide in a motor vehicle having a lean burning internal combustion engine |
US9212586B2 (en) | 2012-05-29 | 2015-12-15 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification apparatus for internal combustion engine |
US20160290204A1 (en) * | 2013-03-22 | 2016-10-06 | Toyota Jidosha Kabushiki Kaisha | Exhaust Gas Purification Apparatus for Internal Combustion Engine |
US9776134B2 (en) | 2012-11-29 | 2017-10-03 | Toyota Jidosha Kabushiki Kaisha | Exhaust purification system of internal combustion engine |
US20180216510A1 (en) * | 2017-01-30 | 2018-08-02 | Ford Global Technologies, Llc | Exhaust gas aftertreatment |
CN114607490A (zh) * | 2022-03-17 | 2022-06-10 | 潍柴动力股份有限公司 | 一种发动机模式调整方法、装置、电子设备及存储介质 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5615502B2 (ja) * | 2009-02-24 | 2014-10-29 | バブコック日立株式会社 | 脱硝触媒保護方法及び脱硝触媒保護装置 |
US8904760B2 (en) * | 2009-06-17 | 2014-12-09 | GM Global Technology Operations LLC | Exhaust gas treatment system including an HC-SCR and two-way catalyst and method of using the same |
KR20140143145A (ko) * | 2012-03-02 | 2014-12-15 | 할도르 토프쉐 에이/에스 | 엔진 배기 가스로부터 유독 화합물의 제거를 위한 방법 및 시스템 |
CN105074149B (zh) * | 2013-04-05 | 2017-09-22 | 丰田自动车株式会社 | 内燃机的排气净化系统 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6089015A (en) * | 1997-05-21 | 2000-07-18 | Degussa-Huls Aktiengesellschaft | Method of purifying a lean exhaust gas and catalytic system therefor |
US20040098980A1 (en) * | 2002-11-21 | 2004-05-27 | Montreuil Clifford Norman | Exhaust gas aftertreatment systems |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE509787C2 (sv) * | 1997-07-18 | 1999-03-08 | Volvo Ab | Anordning och förfarande för katalytisk avgasrening med tillförsel av väte |
JPH11257125A (ja) * | 1998-03-12 | 1999-09-21 | Nippon Soken Inc | 触媒温度制御方法 |
JP2001303934A (ja) * | 1998-06-23 | 2001-10-31 | Toyota Motor Corp | 内燃機関の排気浄化装置 |
JP2000161046A (ja) * | 1998-11-24 | 2000-06-13 | Mitsubishi Motors Corp | 内燃機関の排気浄化装置 |
JP4224383B2 (ja) | 2003-06-12 | 2009-02-12 | 日野自動車株式会社 | 排気浄化装置 |
JP2005264894A (ja) * | 2004-03-22 | 2005-09-29 | Hino Motors Ltd | 排気浄化装置 |
-
2007
- 2007-03-19 JP JP2007070020A patent/JP4702310B2/ja not_active Expired - Fee Related
-
2008
- 2008-03-18 CN CN2008800039860A patent/CN101600862B/zh not_active Expired - Fee Related
- 2008-03-18 US US12/312,785 patent/US20100037596A1/en not_active Abandoned
- 2008-03-18 WO PCT/JP2008/055615 patent/WO2008114885A1/fr active Application Filing
- 2008-03-18 EP EP08722814A patent/EP2123875B1/fr not_active Not-in-force
- 2008-03-18 AT AT08722814T patent/ATE555282T1/de active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6089015A (en) * | 1997-05-21 | 2000-07-18 | Degussa-Huls Aktiengesellschaft | Method of purifying a lean exhaust gas and catalytic system therefor |
US20040098980A1 (en) * | 2002-11-21 | 2004-05-27 | Montreuil Clifford Norman | Exhaust gas aftertreatment systems |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8806851B2 (en) | 2007-09-28 | 2014-08-19 | Daimler Ag | Method for reducing emission of nitrogen oxide in a motor vehicle having a lean burning internal combustion engine |
US20120036839A1 (en) * | 2010-08-10 | 2012-02-16 | Gm Global Technology Operations, Inc. | Vehicle oxidation catalyst efficiency model for adaptive control and diagnostics |
US8820051B2 (en) * | 2010-08-10 | 2014-09-02 | GM Global Technology Operations LLC | Vehicle oxidation catalyst efficiency model for adaptive control and diagnostics |
US9212586B2 (en) | 2012-05-29 | 2015-12-15 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification apparatus for internal combustion engine |
US9776134B2 (en) | 2012-11-29 | 2017-10-03 | Toyota Jidosha Kabushiki Kaisha | Exhaust purification system of internal combustion engine |
US20160290204A1 (en) * | 2013-03-22 | 2016-10-06 | Toyota Jidosha Kabushiki Kaisha | Exhaust Gas Purification Apparatus for Internal Combustion Engine |
US9657629B2 (en) * | 2013-03-22 | 2017-05-23 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification apparatus for internal combustion engine |
US20180216510A1 (en) * | 2017-01-30 | 2018-08-02 | Ford Global Technologies, Llc | Exhaust gas aftertreatment |
US10690029B2 (en) * | 2017-01-30 | 2020-06-23 | Ford Global Technologies, Llc | System and method for exhaust gas aftertreatment with lean NOx trap and exhaust gas recirculation |
CN114607490A (zh) * | 2022-03-17 | 2022-06-10 | 潍柴动力股份有限公司 | 一种发动机模式调整方法、装置、电子设备及存储介质 |
Also Published As
Publication number | Publication date |
---|---|
CN101600862A (zh) | 2009-12-09 |
EP2123875A1 (fr) | 2009-11-25 |
JP4702310B2 (ja) | 2011-06-15 |
WO2008114885A1 (fr) | 2008-09-25 |
EP2123875B1 (fr) | 2012-04-25 |
EP2123875A4 (fr) | 2011-05-11 |
JP2008231966A (ja) | 2008-10-02 |
ATE555282T1 (de) | 2012-05-15 |
CN101600862B (zh) | 2013-01-02 |
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