CN106321204A - Process for exhaust gas aftertreatment and device for purifying the exhaust gas of an internal combustion engine - Google Patents
Process for exhaust gas aftertreatment and device for purifying the exhaust gas of an internal combustion engine Download PDFInfo
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- CN106321204A CN106321204A CN201610387315.5A CN201610387315A CN106321204A CN 106321204 A CN106321204 A CN 106321204A CN 201610387315 A CN201610387315 A CN 201610387315A CN 106321204 A CN106321204 A CN 106321204A
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- particulate filter
- exhaust gas
- internal combustion
- combustion engine
- air
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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
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
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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
- 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
- F01N13/0093—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 the purifying devices are of the same type
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/0231—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using special exhaust apparatus upstream of the filter for producing nitrogen dioxide, e.g. for continuous filter regeneration systems [CRT]
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/05—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of air, e.g. by mixing exhaust with air
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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
- F01N3/101—Three-way 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
- F01N3/24—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
- F01N3/30—Arrangements for supply of additional air
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- 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
- F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
- F02D41/025—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus by changing the composition of the exhaust gas, e.g. for exothermic reaction on exhaust gas treating apparatus
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- 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
- F02D41/029—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 particulate filter
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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
- F01N2250/00—Combinations of different methods of purification
- F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
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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
- F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
- F01N2430/06—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by varying fuel-air ratio, e.g. by enriching fuel-air mixture
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- 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
- F02D2200/0812—Particle filter loading
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- 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
- F02D41/0002—Controlling intake air
- F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Materials Engineering (AREA)
- Exhaust Gas After Treatment (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
The present invention discloses a method and apparatus for post-treatment of an exhaust gas for an internal combustion engine (10), the internal combustion engine comprising an exhaust gas passage (12), a first three-way catalyst (14) arranged in the exhaust passage (12), particulate filter (18, 18 ') followed by the flow direction of the exhaust gas, and a device (20) which is used for the secondary air intake to the exhaust gas passage (12) and arranged disposed before the particulate filter (18, 18 ') along the flow direction of the exhaust gas, wherein a second three-way catalyst (16) is arranged in the exhaust passage (12) between the device (20) for secondary air intake and the particulate filter (18, 18 ') in the flow direction of the exhaust gas or the particulate filter (18 ') has a three-way catalytic coating. The method comprises the steps of: operating the internal combustion engine (10) in a stoichiometric combustion air ratio; detecting an exhaust gas passage arranged in the internal combustion engine (10) (18) in the exhaust gas passage (12); if necessary, by adjusting the flammable mixture for the internal combustion engine (10) to be concentrated and passing the secondary air into the exhaust gas passage (12), the temperature of the exhaust gas is raised to the regeneration temperature of the particulate filter (18) so that in the heating stage of the particulate filter (18, 18 ') in the second three-way catalyst (16) or in the catalytic coating of the particulate filter (18 '), and the internal combustion engine (10) is operated with a concentrated or stoichiometric mixture during the regeneration stage of the particulate filter (18, 18 ').
Description
Technical field
The present invention relates to the equipment of a kind of exhaust aftertreatment for internal combustion engine and one for exhaust aftertreatment equipment
Regeneration method.
Background technology
Constantly vehicular manufacturer is had higher requirement by the tail gas regulation of severization, and described requirement is used by corresponding
In the measure of raw emissions of reduction electromotor and solved by corresponding exhaust aftertreatment.Along with the next one is made laws the stage
The introducing of EU6 standard, defines the ultimate value of granule number for gasoline engine.Can come really by using gasoline engine particulate filter
Protect and observe this ultimate value.In travelling running, this gasoline engine particulate filter is loaded by flue dust.In order to not make tail
Gas is pressed substantially rising, and this gasoline engine particulate filter has to last for ground or periodically regenerates.In order to make by gasoline engine
The flue dust that grain filter reclaims aoxidizes with the oxygen development of heat, it is necessary to make sufficiently high temperature level with the most existing in gasoline
Oxygen in the exhaust system of machine combines.Because the Diesel engine in modern times generally in the case of there is no excess oxygen with change
Learn metering (or referred to as equivalent) combustion air ratio (λ=1；λ is also known as " excess air coefficient ") run, this is needed addition thereto.
Measure to this such as considers the thin adjustment (Magerverstellung) or defeated to exhaust system in short-term of Diesel engine
Enter auxiliary air.The thin adjustment of gasoline engine is preferably used so far because the method need not to use extra parts and
The amount of oxygen of abundance can be carried on petrolic most of operating point.But the drawback of described thin adjustment is,
During the thin adjustment of electromotor, nitric oxide can not be converted fully by three-way catalyst.
By the known a kind of equipment for exhaust aftertreatment of document DE 103 61 791 A1, described equipment has nitrogen oxidation
Compound accumulator-type catalytic converter and particulate filter, wherein, make internal combustion engine mix to make the regeneration of oxynitride accumulator-type catalytic converter
Run than dense, and be blown into auxiliary air to exhaust gas channel between oxynitride storage catalyst and particulate filter.
In this way, the regeneration of particulate filter it is simultaneously achieved.
By the known a kind of exhaust aftertreatment equipment of document DE 10 2,010 046 747 A1 and exhaust aftertreatment method, its
In, for the regeneration of particulate filter, flow into air in particulate filter than swinging between dense and thin alternatively.
The drawback that known equipment and method have is, does not the most implement tail gas completely when regeneration clean
Change, and so that the tail gas of discharge is raising during particulate filter.
Summary of the invention
The current technical problem to be solved of the present invention is, it is provided that a kind of method and apparatus, utilizes described method and sets
For realizing the sufficiently high temperature level for particulate filter regeneration, but also can be in the regeneration of particulate filter
During to make discharge of poisonous waste be kept as the lowest.
Described technical problem is solved by a kind of method for internal combustion engine, the most petrolic exhaust aftertreatment,
And solved by a kind of device for implementing said method.
A kind of for internal combustion engine, the method for the most petrolic exhaust aftertreatment according to the invention provides, described
Internal combustion engine includes exhaust gas channel, be arranged in described exhaust gas channel the first ternary catalyzing unit, flow direction along tail gas are followed by
Particulate filter and before being arranged in particulate filter along the flow direction of tail gas for entering to exhaust gas channel auxiliary air
The device of gas, wherein, along tail gas flow direction between the device and particulate filter of auxiliary air air inlet at tail gas
Passage being arranged, the second ternary catalyzing unit or particulate filter have three-element catalytic coating, said method comprising the steps of:
The combustion air ratio of-internal combustion engine stoichiometrically (or referred to as chemical equivalent) (；Also known as mixing air ratio) run；
The load condition of-detection arrangement particulate filter in the exhaust gas channel of internal combustion engine；
-when described load condition needs to regenerate particulate filter, by internal combustion engine the most temporarily will be used for
Flammable mixture regulation to the denseest (fett) and by being passed through auxiliary air the most in short-term in exhaust gas channel by tail gas
Temperature improves to the regeneration temperature of particulate filter, thus heating period of particulate filter in the second ternary catalyzing unit or
Person make in the particulate filter that catalyst coatings processes dense combustion tail gas by exothermic oxidation, and
-internal combustion engine utilizes dense or stoichiometric mixture to run during the regeneration stage of particulate filter.
By the method according to the invention, particulate filter can be heated to regeneration temperature, and regenerate subsequently, without
Heating period at particulate filter or the regeneration stage at particulate filter make the purification of at least one three-element catalytic parts make
With affecting adversely.
For being designed to petrolic internal combustion engine, particulate filter can be designed as gasoline engine particulate filter also
And it is referred to as gasoline engine particulate filter.
By the measure implemented in the dependent claims, it is possible to achieve method given in the independent claim
Extension and improvement.
It should be understood that the state of concept " heating period " and " regeneration stage " indication not necessarily have to depend in time
Secondary priority occurs, but can also exist simultaneously.
Also, it is to be understood that the load condition triggering regeneration of particulate filter can be by really in the way of different parameters
It is fixed, as long as described parameter provides the direct or indirect report about load.Such as load condition can pass through particle filtering
The differential pressure measurement of the upstream and downstream of device records.Alternately, according to suitable operational factor, the such as current load of internal combustion engine
With rotating speed fictitious load state.When load condition exceedes predetermined threshold value, it is therefore necessary to regenerate.
Preferred development mode according to described method specifies, internal combustion engine is profit during the heating period of particulate filter
Run with dense mixture, and during the regeneration stage of particulate filter combustion air ratio stoichiometrically (λ=
1) run.Because internal combustion engine only nonstoichiometry combustion air ratio during the heating period, and utilize dense mixing
Thing runs (λ ＜ 1), can be kept as by raw emissions relatively low.Additionally, there are reducing agent in tail gas (carbohydrate HC,
Carbon monoxide CO, hydrogen H2) share sent out by the auxiliary air before the second ternary catalyzing unit or catalysis type particulate filter
Raw exothermic oxidation, thus obtains desired exhaust temperature and rises, and on the other hand also at the entrance of the second ternary catalyzing unit
Have and meet stoichiometric mixing air ratio to greatest extent, so that the second ternary catalyzing unit/catalysis type particulate filter
Can effectively limit the harmful substance in tail gas.
It is defined as advantageously in the method according to the invention, in the heating period, by auxiliary air air inlet at tail
Gas passage arranges stoichiometric mixing at the second catalyst converter or before the entrance of the particulate filter of catalyst coatings process
Air ratio, and hyperstoichiometry is set in regeneration stageMixing air ratio (thin, λ
＞ 1).Thus can improve the oxygen content in tail gas, thus by accordingly to the flue dust reclaimed in particulate filter
Oxidation reliably and controllably realizes the regeneration of particulate filter.
According to the preferred improved procedure of another kind specify, in order to carry out the regeneration of particulate filter, the heating period with again
Repeatedly alternately conversion between the raw stage.It may thereby be ensured that, on the one hand will not lead in the regenerative process of particulate filter
Cause particulate filter overheated and burn, and dropping to below regeneration temperature at a temperature of on the other hand avoiding.This preferably passes through
Constant auxiliary air air inlet and internal combustion engine stoichiometry and dense alternate run realize.Thus, in the stoichiometry of internal combustion engine
Time interval in realize thin mixing air ratio by auxiliary air, and in dense (low stoichiometry) time interval
Realize stoichiometric mixing air ratio.The relative length of heating period and regeneration stage can be chosen as equal or different length
, it is isometric the most in time.
In addition advantageously provide for, during the heating period and during regeneration stage, combustion the most stoichiometrically
Burn air ratio or mixing air ratio and load the first and second ternary catalyzing units or the first ternary catalyzing unit or through catalyst coatings process
Particulate filter.It is possible to guarantee all the time effective tail gas clean-up under each running status of internal combustion engine.
According to described method alternative improved procedure regulation, internal combustion engine during the heating period of particulate filter and
Utilize dense mixture to run during regeneration stage, wherein, be passed through the auxiliary air of such quantity the two stage,
The mixing air ratio making the porch of particulate filter is the thinnest, say, that have abundant superfluous oxygen, and
Flue dust in oxidation particle filter.In this embodiment, heating period and regeneration stage occur simultaneously.Dense by internal combustion engine
Mixing ratio can realize relatively low nitric oxide production raw emissions.Yet with each in the two ternary catalyzing unit and warp
The particulate filter that catalyst coatings processes all does not has combustion air ratio stoichiometrically or stoichiometric mixing air than fortune
OK, it is possible that nitric oxide slips (Stickoxid-Schlupf), and nitric oxide slips and can also pass through other equally
Exhaust aftertreatment equipment, especially nitrogen oxides storage catalyst converter are eliminated.
Also specify a kind of for internal combustion engine, the equipment of the most petrolic tail gas clean-up according to the present invention, described
The first ternary catalyzing unit that internal combustion engine with exhaust gas channel, is arranged in described exhaust gas channel, flow direction along tail gas are followed by
Particulate filter and before being arranged in this particulate filter along the flow direction of tail gas for carrying out secondary to exhaust gas channel
The device of air inlet, wherein, along the flow direction of tail gas between the device and particulate filter of auxiliary air air inlet
Tool arranges the second ternary catalyzing unit, or particulate filter has three-element catalytic coating, and described equipment is designed for reality
Execute the method according to the invention.Thus under the running status of internal combustion engine, (under this running status, carry out mixing in internal combustion engine
Thickization of compound is for by the auxiliary air inlet air heating tail gas on the second catalyst converter) and stoichiometric mixing is set
Air ratio and realize effective tail gas clean-up from there through the second three-element catalytic parts.Under the running status of internal combustion engine (
Under described running status, internal combustion engine combustion air the most stoichiometrically is than running and to have passed through the first three-element catalytic
Device realizes effective tail gas clean-up) auxiliary air can be inputted before the second three-element catalytic parts, in order to at particle filtering
The oxidation of the flue dust reclaimed in device provides oxygen, and is achieved in the regeneration of particulate filter.Thus ensure that, the two three
Unit's catalytic member there is the most all the time a ratio of mixing air stoichiometrically run, and by the two three-element catalytic portion
Tail gas is effectively purified by one in part.It is also feasible that under the another kind of running status of internal combustion engine, internal combustion engine with
Stoichiometric mixing air is than running, and does not insert auxiliary air.Under this running status, two three-element catalytic parts with
Stoichiometry mixing air is than running.
Being advantageously improved mode according to one to specify, the device for auxiliary air air inlet includes secondary air valve.Pass through
Secondary air valve can regulate the air input between the first ternary catalyzing unit and the second three-element catalytic parts.It is possible to letter
Single and comfortable mode, adjust in exhaust gas channel secondary air valve downstream, especially in the second ternary catalyzing unit and/or granule mistake
Mixing air ratio on filter.Thus can realize tail gas clean-up by the second three-element catalytic parts or control particulate filter
Regeneration.Especially can suppress too high oxygen concentration by closing secondary air valve and thus suppress cigarette in particulate filter
The burning that dirt is uncontrolled, the most uncontrolled burning can cause the damage of particulate filter.
Another kind of preferably improved procedure is, the device for auxiliary air air inlet includes two layer of air pipelines, described
Air pipe line section between compressor with internal combustion engine is connected by auxiliary air pipeline with exhaust gas channel.Can be by by compressor
Air is compressed to higher than the pressure in the first ternary catalyzing unit downstream in exhaust gas channel.Thus can it is unnecessary to auxiliary air enter
Gas and need extra for compressed-air actuated compressor.
According to preferred embodiment specifying, along tail gas through exhaust gas channel flow direction the second ternary catalyzing unit with
Between particulate filter or along described flow direction after particulate filter, exhaust gas channel is disposed with exhaust gas oxygensensor.Pass through
Oxygen content in exhaust gas oxygensensor detection tail gas, and by auxiliary air air inlet adjustment to mixing air ratio, in order to regulation particle filtering
The heating of device and/or the regeneration of particulate filter.
The technical characteristic that other decision design mode of the present invention is specified in the dependent claims by remaining is given.
If it is not otherwise indicated in individual cases, then the numerous embodiments that the present invention is previously mentioned in this application is all
Can advantageously be combined with each other.
Internal combustion engine is preferably the parts of the driving means of motor vehicles, especially car.Described driving means can be combined drive
Dynamic device, it has multiple with the different from each other parts driving energy source.
Accompanying drawing explanation
According to embodiment, the present invention is carried out more detailed elaboration below by accompanying drawing.In the accompanying drawings:
Fig. 1 illustrates a kind of embodiment of internal combustion engine, its tail gas for cleaning internal combustion engines with the with good grounds present invention
Equipment；
Fig. 2 illustrates the alternate embodiment of internal combustion engine, its tail gas for cleaning internal combustion engines with the with good grounds present invention
Equipment；
Fig. 3 illustrates the view of the embodiment of the regeneration for particulate filter according to the present invention；
Fig. 4 illustrates the view of the alternate embodiment of the regeneration for particulate filter according to the present invention.
Detailed description of the invention
Fig. 1 illustrates internal combustion engine 10, and it is in the petrolic form loaded by turbocharger 30, described internal combustion engine
With air supply system 50 and with exhaust gas channel 12.Air supply system 50 includes air filter 42, aspirating air pipe 36, compressor
28, air throttle 38 and charger-air cooler 40.In exhaust gas channel 12, the flow direction along the tail gas of internal combustion engine 10 is disposed with
The turbine 34 of turbocharger 30, described turbine drives the compressor 28 of turbocharger 30 by drive shaft 44.
Tail gas along internal combustion engine 10 passes the flow direction of exhaust gas channel 12, in turbine 34 downstream in exhaust gas channel 12
It is disposed with the first ternary catalyzing unit 14.It is provided with for exhaust gas channel 12 auxiliary air in the downstream of the first ternary catalyzing unit 14
The device 20 of air inlet.Device 20 for auxiliary air air inlet includes secondary air valve 22 and auxiliary air pipeline 24, described two
Secondary air pipe line is by the suction line 36 air pipe line section between compressor 28 with internal combustion engine 10 26 and exhaust gas channel 12 phase
Even.In the downstream of the device 20 for auxiliary air air inlet, exhaust gas channel 12 is disposed with the second ternary catalyzing unit 16.Along interior
The tail gas of combustion engine 10 is through the flow direction of exhaust gas channel 12, and the arranged downstream at the second ternary catalyzing unit 16 has exhaust gas oxygensensor 32
With particulate filter 18, especially gasoline engine particulate filter.
Fig. 2 illustrates another kind of internal combustion engine 10, and it is with air supply system 50 and exhaust gas channel 12.Substantially the same at structure
In the case of, exhaust gas channel 12 is not arranged the second ternary catalyzing unit 16.It is true that instead of non-catalytic granule mistake in Fig. 1
Filter 18, layout design has the particulate filter 18 ' of three-element catalytic coating, and it thereby is achieved ternary catalyzing unit and particle filtering
The function of device.
The granule processed through catalyst coatings in the category of the application, in the second ternary catalyzing unit 16 and Fig. 2 in Fig. 1
Filter 18 ' is all referred to as the second three-element catalytic parts.
The flue dust formed when internal combustion engine operation is recovered by particulate filter 18,18 ', wherein, and particulate filter
18,18 ' loaded by flue dust.If (this is the most permissible for the threshold value of the determination that the flue dust detecting particulate filter 18,18 ' loads
By the pressure differential of particulate filter 18,18 ' being measured or being completed by calculating based on model), then begin to take on granule
The renovation process of filter 18,18 '.To this end, first by the tail gas temperature of internal combustion engine 10 before the entrance of particulate filter 18,18 '
Degree brings up to the regeneration temperature of about 600 DEG C.This is realized by the method according to the invention.First, the second three-element catalytic is checked
Whether parts 16,18 ' have so-called " initiation temperature ", its e.g., about 350 DEG C.It may thereby be ensured that, the tail of internal combustion engine 10
The unburned component of the fuel in gas can exothermic oxidation in the second three-element catalytic parts 16,18 '.If the second three-element catalytic
Parts 16,18 ' are in initiation temperature, then particulate filter 18,18 ' is still heated to regeneration temperature.To this end, internal combustion engine 10 is sharp
Running with rich mixture, described rich mixture preferably has the combustion air ratio that λ is about 0.9.The unburned component of gaseous mixture,
Especially carbon monoxide, carbohydrate and hydrogen imports in exhaust gas channel 12 together with combustion product.Owing to air enters pressure
Suction line 36 and this air after contracting machine 28 import exhaust gas channel by auxiliary air pipeline 24 and secondary air valve 22
12, the unburned component of fuel can locate exothermic conversion at the second three-element catalytic parts 16,18 ' being positioned at downstream.Internal combustion engine
The combustion air of 10 compares λECan adjust with pilot-operated type, thus be set to desired target temperature.Meanwhile, urged by the second ternary
After changing the mixing obtained by the exhaust gas oxygensensor 32 in device 16 downstream measures the combustion air ratio by internal combustion engine 10 and the auxiliary air that is passed through
Combustion air compare λm.During the heating period of particulate filter 18,18 ', this mixed combustion air compares λmAdjusted
Save to λm=1, so that the second three-element catalytic parts 16,18 ' are capable of preferable tail gas clean-up effect, and effectively turn
Change the harmful substance in tail gas.
If reaching the regeneration temperature of particulate filter 18,18 ', then switch to regeneration stage.To this end, internal combustion engine 10 is again
Combustion air stoichiometrically compares λE=1 runs.It is possible to during the regeneration stage of the first ternary catalyzing unit 14
Fully convert the harmful substance of the tail gas of internal combustion engine 10.In order to provide oxygen to the regeneration of particulate filter 18,18 ', further
Auxiliary air is blasted in exhaust gas channel 12.Desired mixed combustion air ratio (such as λm=1.1) can be by wearing
The corresponding dosage of the auxiliary air crossing secondary air valve 22 is conditioned.It is possible to guarantee in the middle recovery of particulate filter 18,18 '
The conversion ratio of flue dust will not be too high, otherwise will cause the hot injury of particulate filter 18,18 '.If at regeneration stage
During be down to below regeneration temperature at a temperature of particulate filter 18,18 ' porch, then back switch to the heating period.As
Shown in Fig. 3, the switching between heating period and the regeneration stage of particulate filter 18,18 ' can exist the most respectively
Complete in the time interval of 100 seconds.This process repeats always, until particulate filter 18,18 ' fully regenerates, this is such as same
Sample passes through particulate filter 18,18 ' pressure differential front and back and measures realization.
Alternately, particulate filter 18,18 ' can also regenerate as depicted in Figure 4.In the case, heating
Stage and regeneration stage are carried out simultaneously.To this end, internal combustion engine 10 runs with dense mixture, preferably with λEThe combustion of=0.9 to 0.95
Burn air ratio to run.Meanwhile, preferably last for blasting in exhaust gas channel 12 auxiliary air, so that the combustion mixed thinly
Burn air ratio (it is also referred to as mixing air ratio) and be adjusted to λm＞ 1, preferably λm=1.1.The thus unburned component of fuel
Exothermic oxidation and there is enough oxygen auxiliary use simultaneously, in order to convert the cigarette in the middle recovery of particulate filter 18,18 '
Dirt.
Two methods described in figs. 3 and 4 can convert with the design of shown exhaust gas channel 12.Preferably
Ground is implemented according to the method for Fig. 3 so that in the method at least one ternary catalyzing unit 14,16 (in other words 18 ') all the time with
Stoichiometry mixing air is than running.
List of numerals
10 internal combustion engines
12 exhaust gas channels
14 first ternary catalyzing units
16 second ternary catalyzing units
18 particulate filters
18 ' the particulate filters processed through catalyst coatings
20 devices being used for auxiliary air air inlet
22 secondary air valves
24 auxiliary air pipelines
26 air pipe line sections
28 compressors
30 turbocharger
32 exhaust gas oxygensensors
34 turbines
36 suction line
38 air throttles
40 charger-air coolers
42 air filters
44 drive shafts
50 air supply systems
λECombustion air ratio
λmMixing air ratio
Claims (10)
1., for internal combustion engine (10), a method for the most petrolic exhaust aftertreatment, described internal combustion engine includes tail gas
Passage (12), the first ternary catalyzing unit (14) being arranged in described exhaust gas channel (12), flow direction along tail gas are followed by
Particulate filter (18,18 ') and the flow direction along tail gas be arranged in before particulate filter (18,18 ') for tail gas
The device (20) of passage (12) auxiliary air air inlet, wherein, along the flow direction of tail gas at the device for auxiliary air air inlet
(20) in exhaust gas channel (12), arrange the second ternary catalyzing unit (16) or described and between particulate filter (18,18 ')
Grain filter (18 ') has three-element catalytic coating, said method comprising the steps of:
-internal combustion engine (10) combustion air stoichiometrically is than running；
The load condition of-detection arrangement particulate filter (18,18 ') in the exhaust gas channel (12) of internal combustion engine (10)；
-when described load condition needs to regenerate particulate filter (18,18 '), in being the most temporarily used for
The flammable mixture of combustion engine (10) is adjusted to dense and by being the most temporarily passed through auxiliary air in exhaust gas channel (12)
Exhaust temperature is improved the regeneration temperature to particulate filter (18,18 '), thus in the heating of particulate filter (18,18 ')
Stage makes dense burning tail in the second ternary catalyzing unit (16) or in the particulate filter (18 ') processed through catalyst coatings
Gas is aoxidized by heat release by auxiliary air, and
-internal combustion engine (10) utilizes dense or stoichiometric mixture during the regeneration stage of particulate filter (18,18 ')
Run.
Method the most according to claim 1, it is characterised in that internal combustion engine (10) is in the heating of particulate filter (18,18 ')
Run with dense mixture during stage, and with chemistry during the regeneration stage of particulate filter (18,18 ')
The mixture of metering runs.
Method the most according to claim 2, it is characterised in that in the heating period, by auxiliary air air inlet at tail gas
Passage (12) is arranged at the second ternary catalyzing unit (16) or before the entrance of the particulate filter (18 ') of catalyst coatings process
Stoichiometric mixing air ratio, and in regeneration stage, superstoichiometric mixing air ratio is set.
The most according to the method in any one of claims 1 to 3, it is characterised in that for particulate filter (18,18 ')
Regeneration, the most repeatedly switches between heating period and regeneration stage.
Method the most according to any one of claim 1 to 4, it is characterised in that during the heating period and
During regeneration stage, the first or second ternary catalyzing unit (14,16) the first ternary catalyzing unit (14) in other words or through catalysis
The particulate filter (18 ') that coating processes distinguishes combustion air ratio the most stoichiometrically or mixing air than running.
Method the most according to claim 1, it is characterised in that internal combustion engine is in the heating period of particulate filter (18,18 ')
During and run with dense mixture during regeneration stage, wherein, input so number in the two stage
The auxiliary air of amount so that the excess of oxygen that mixing air in the porch of particulate filter (18,18 ') is more sufficiently large than having
Gas, and make the flue dust in particulate filter (18,18 ') oxidized.
7., for cleaning internal combustion engines (10), an equipment for the most petrolic tail gas, described internal combustion engine leads to tail gas
Road (12), the first ternary catalyzing unit (14) being arranged in described exhaust gas channel (12), flow direction along tail gas be followed by
Grain filter (18,18 ') and the flow direction along tail gas be arranged in before described particulate filter (18,18 ') for tail
The device (20) of gas passage (12) auxiliary air air inlet, it is characterised in that the flow direction along tail gas is entering for auxiliary air
In exhaust gas channel (12), the second ternary catalyzing unit (16) it is disposed with between the device (20) of gas and particulate filter (18,18 ')
Or described particulate filter (18 ') has three-element catalytic coating, and described equipment is designed to carry out according to claim 1
To the method according to any one of 6.
Equipment the most according to claim 7, it is characterised in that the device (20) for auxiliary air air inlet includes that secondary is empty
Air valve (22).
9. according to the equipment described in claim 7 or 8, it is characterised in that the device (20) for auxiliary air air inlet includes two
Secondary air pipe line (24), described auxiliary air pipeline makes the air pipe line section (26) between compressor (28) and internal combustion engine (10)
It is connected with exhaust gas channel (12).
10. according to the equipment according to any one of claim 7 to 9, it is characterised in that in exhaust gas channel (12), along tail gas
Through the flow direction of exhaust gas channel (12) the second ternary catalyzing unit (16) and particulate filter (18,18 ') or along stream
Exhaust gas oxygensensor (32) is arranged after particulate filter (18,18 ') in dynamic direction.
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|---|---|---|---|
| DE102015212514.9A DE102015212514B4 (en) | 2015-07-03 | 2015-07-03 | Method for exhaust gas aftertreatment and device for cleaning the exhaust gas of an internal combustion engine |
| DE102015212514.9 | 2015-07-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106321204A true CN106321204A (en) | 2017-01-11 |
| CN106321204B CN106321204B (en) | 2019-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610387315.5A Active CN106321204B (en) | 2015-07-03 | 2016-06-02 | For the method for exhaust aftertreatment and the equipment of the tail gas for cleaning internal combustion engine |
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| CN (1) | CN106321204B (en) |
| DE (1) | DE102015212514B4 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| DE102015212514B4 (en) | 2024-03-07 |
| CN106321204B (en) | 2019-02-22 |
| DE102015212514A1 (en) | 2017-01-05 |
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