CN108625948A - After-treatment system for motor vehicles - Google Patents

After-treatment system for motor vehicles Download PDF

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Publication number
CN108625948A
CN108625948A CN201810195190.5A CN201810195190A CN108625948A CN 108625948 A CN108625948 A CN 108625948A CN 201810195190 A CN201810195190 A CN 201810195190A CN 108625948 A CN108625948 A CN 108625948A
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CN
China
Prior art keywords
treatment system
scr
lnt
diesel oil
activated catalyst
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Pending
Application number
CN201810195190.5A
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Chinese (zh)
Inventor
A·德菲利波
A·潘努兹奥
李伟
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GM Global Technology Operations LLC
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GM Global Technology Operations LLC
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Publication of CN108625948A publication Critical patent/CN108625948A/en
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Classifications

    • 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
    • F01N3/108—Auxiliary reduction catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • 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]
    • 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
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
    • 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
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
    • 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
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
    • 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
    • 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
    • F01N2560/08—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a pressure sensor
    • 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
    • F01N2570/10—Carbon or carbon oxides
    • 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
    • F01N2570/12—Hydrocarbons
    • 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
    • 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
    • F01N2570/18—Ammonia
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Materials Engineering (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

A kind of after-treatment system for internal combustion engine, it includes diesel oil cooled activated catalyst component, poor NOx trap (LNT) component and selective catalytic reduction (SCR) component, the poor NOx trap component is positioned in close proximity to diesel oil cooled activated catalyst and is arranged downstream, and the selection catalysis reduction component is arranged in downstream LNT.The diesel oil cooled activated catalyst is operable with the reducing NOx emissions object under the operation temperature less than 200 DEG C, and SCR system is operable with the reducing NOx emissions object under the operation temperature higher than 200 DEG C.

Description

After-treatment system for motor vehicles
Introduction
The present invention relates to the fields of after-treatment system, and more specifically to the post-processing system for motor vehicles System.
Internal combustion engine generally produces the undesirable gas of such as CO, CO2, NOx etc in operation.Many countries have formulated The regulation of limit engine emission.Various after-treatment systems have been introduced to reduce emission.In many cases, existing After-treatment system is operated in normal operation conditions.During normal operation conditions, exhaust component is heated to be more than about 175 DEG C of operation temperature.
Just implementing new emission regulation, to solve less than normal running temperature issuable emission.After current Electric heater can be used in processing system, which is positioned to heating post-processing catalyst, for example to subtract during cold start-up Few emission.Electric heater increases additional component, these components need periodicmaintenance and increase the total of after-treatment device Body complexity.In addition, electric heater needs warm-up phase during this period because emission may and be unsatisfactory for current and co-pending Occur under the level of regulation.Accordingly, it is desired to provide a kind of after-treatment system, which operates during cold start-up to subtract Less in the emission less than the internal combustion engine operated under normal running temperature.
Invention content
In one exemplary embodiment, for the after-treatment system of internal combustion engine include diesel oil cooled activated catalyst component, Poor NOx trap (LNT) component and selective catalytic reduction (SCR) component, the LNT components are positioned in close proximity to diesel oil cold start-up Catalyst is simultaneously arranged downstream, and the SCR components are arranged in downstream LNT.Diesel oil cooled activated catalyst it is operable with less than Reducing NOx emissions object under 200 DEG C of operation temperature, and SCR system is operable to be restored under the operation temperature higher than 200 DEG C NOx emission.
In addition to the one or more of the feature described hereinbefore or hereinafter, or alternatively, other embodiment may include Diesel emission fluid (DEF) spraying system, DEF spraying systems are operable is produced by internal combustion engine with being introduced into diesel emission fluid for this In raw exhaust gas.
In addition to the one or more of the feature described hereinbefore or hereinafter, or alternatively, other embodiment may include, Wherein, DEF spraying systems are arranged in downstream LNT and the upstreams SCR.
In addition to the one or more of the feature described hereinbefore or hereinafter, or alternatively, other embodiment may include Transfer pipe, the transfer pipe fluidly connect diesel oil cooled activated catalyst and LNT and SCR.
In addition to the one or more of the feature described hereinbefore or hereinafter, or alternatively, other embodiment may include, Wherein, DEF spraying systems are fluidly coupled to transfer pipe.
In addition to the one or more of the feature described hereinbefore or hereinafter, or alternatively, other embodiment may include, Wherein, DEF spraying systems include urea injector.
In addition to the one or more of the feature described hereinbefore or hereinafter, or alternatively, other embodiment may include Be arranged diesel oil cooled activated catalyst upstream O2/NOx sensors and exhaust gas temperature (EGT) sensor it is at least one, and Be arranged downstream LNT O2/NOx sensors and EGT sensors it is at least one.
In addition to the one or more of the feature described hereinbefore or hereinafter, or alternatively, other embodiment may include Be arranged the upstreams SCR the first differential pressure pickup (DPS) and the 2nd DPS in the downstreams SCR is set.
In addition to the one or more of the feature described hereinbefore or hereinafter, or alternatively, other embodiment may include, Wherein, diesel oil cooled activated catalyst and LNT are arranged in common housing.
In addition to the one or more of the feature described hereinbefore or hereinafter, or alternatively, other embodiment may include Rear oxidation catalyst (ROC) in the downstreams SCR is set.
Another aspect accoding to exemplary embodiment, motor vehicles include internal combustion engine, the internal combustion engine include exhaust system and It is fluidly coupled to the after-treatment system of exhaust system.After-treatment system includes that diesel oil cooled activated catalyst (urge by diesel oil cold start-up Agent) component, poor NOx trap (LNT) component and selective catalytic reduction (SCR) component, the LNT components be positioned in close proximity to Diesel oil cooled activated catalyst is simultaneously arranged downstream, and the SCR components are arranged in downstream LNT.Diesel oil cooled activated catalyst can be grasped Make with the reducing NOx emissions object under the operation temperature less than 200 DEG C, and SCR system is operable in the operation higher than 200 DEG C At a temperature of reducing NOx emissions object.
In addition to the one or more of the feature described hereinbefore or hereinafter, or alternatively, other embodiment may include Diesel emission fluid (DEF) spraying system, DEF spraying systems are operable is produced by internal combustion engine with being introduced into diesel emission fluid for this In raw exhaust gas.
In addition to the one or more of the feature described hereinbefore or hereinafter, or alternatively, other embodiment may include, Wherein, DEF spraying systems are arranged in downstream LNT and the upstreams SCR.
In addition to the one or more of the feature described hereinbefore or hereinafter, or alternatively, other embodiment may include Transfer pipe, the transfer pipe fluidly connect diesel oil cooled activated catalyst and LNT and SCR.
In addition to the one or more of the feature described hereinbefore or hereinafter, or alternatively, other embodiment may include, Wherein, DEF spraying systems are fluidly coupled to transfer pipe.
In addition to the one or more of the feature described hereinbefore or hereinafter, or alternatively, other embodiment may include, Wherein, DEF spraying systems include urea injector.
In addition to the one or more of the feature described hereinbefore or hereinafter, or alternatively, other embodiment may include Diesel emission fluid (DEF) spraying system, the DEF spraying systems are arranged in downstream LNT.
In addition to the one or more of the feature described hereinbefore or hereinafter, or alternatively, other embodiment may include Be arranged diesel oil cooled activated catalyst upstream O2/NOx sensors and exhaust gas temperature (EGT) sensor it is at least one, and Be arranged downstream LNT O2/NOx sensors and EGT sensors it is at least one.
In addition to the one or more of the feature described hereinbefore or hereinafter, or alternatively, other embodiment may include Be arranged the upstreams SCR the first differential pressure pickup (DPS) and the 2nd DPS in the downstreams SCR is set.
In addition to the one or more of the feature described hereinbefore or hereinafter, or alternatively, other embodiment may include, Wherein, diesel oil cooled activated catalyst and LNT are arranged in common shell.
When read in conjunction with the accompanying drawings, features described above of the invention and advantage and other feature and advantage be from the following detailed description Obviously.
Description of the drawings
Only only by example, other feature, advantage and details occur in the following detailed description, the detailed description reference Attached drawing, in attached drawing：
Fig. 1 shows the motor vehicles with exhaust after treatment system of one side accoding to exemplary embodiment；And
Fig. 2 is the block diagram for the exhaust after treatment system for showing one side accoding to exemplary embodiment.
Specific implementation mode
It is described below and is only exemplary in itself, and be not intended to limit the invention, its application, or uses.It answers Understand, throughout the drawings, corresponding reference numeral indicates similar or corresponding component and feature.
One side accoding to exemplary embodiment, motor vehicles are in Fig. 1 generally by 10 instructions.Motor vehicles 10 are shown as skin The form of truck.It should be understood that motor vehicles 10 can take various forms, including automobile, commercial transportation, sea-freight vehicle etc. Deng.Motor vehicles 10 include vehicle body 12, which has enging cabin 14, passenger compartment 15 and loading platform 17.Enging cabin 14 Including internal-combustion engine system 24, which may include diesel engine 26 in shown exemplary embodiment.Internal combustion Machine system 24 includes exhaust system 30, is connected to the exhaust system fluid exhaust after treatment system 34.By internal-combustion engine system 24 The exhaust of generation may enter the NOx emission of air with reduction by after-treatment system 34 by air exit pipeline 36.
The one side of the exemplary embodiment illustrated according to fig. 2, internal-combustion engine system 24 may include turbocharger 40, should Turbocharger has compressor section 42 and turbine section 44.Compressor section 42 includes suction port of compressor 46 and compressor Outlet 47, which may be fluidly connected in air, and the compressor outlet may be fluidly connected in diesel engine 26 air inlet (not indicating individually).Turbine section 44 includes turbine inlet 49 and turbine outlet 50, the turbine Machine entrance is fluidly coupled to exhaust system 30, and the turbine outlet may be fluidly connected in after-treatment system 34.Turbine Outlet 50 will be delivered to after-treatment system 34 by least part of the exhaust gas of turbocharger 40.
One side accoding to exemplary embodiment, after-treatment system 34, which includes that the diesel oil that is arranged in common housing 66 is cold, to be opened Dynamic catalyst structure 60 and poor NOx trap (LNT) component 64.Although being arranged in common housing, it will be appreciated that, diesel oil is cold Start catalyst structure 60 and LNT components 64 can be used as individual component or block is present in common housing.Further, it should be understood that , diesel oil cooled activated catalyst component 60 and LNT components 64 can include respectively unique substrate, which has in block Between the specific region coating of separation is provided.LNT components 64 are arranged in 60 downstream of diesel oil cooled activated catalyst component, this can be at this In become apparent.Exhaust gas, which enters LNT components 64 and increased after being handled by diesel oil cooled activated catalyst component 60, to be somebody's turn to do The internal temperature of LNT components.Common housing 66 includes being fluidly coupled to the entrance 69 of turbine outlet 50 and fluidly connecting In the outlet of transfer pipe 74 71.The operation of diesel oil cooled activated catalyst component 60 is useless at a temperature of being in below about 200 DEG C to restore NOx emission in gas, and the operation of LNT components 64 is likely to be present at a temperature of more than about 200 DEG C with restoring in exhaust gas NOx emission.In this way, diesel oil cooled activated catalyst component 60 and LNT components 64 operate in tandem with restore be likely to be present in from NOx emission in initial start to the exhaust gas of normal operation conditions.
More precisely, in initial start, the temperature of the exhaust gas from internal-combustion engine system 24 is usually less than 200 DEG C.Bavin Oil cooling starts catalyst structure 60 and may include catalyst and/or zeolite trap (not indicating individually), is configured to restore The NOx emission in exhaust gas under start-up temperature.With the ongoing operation of internal-combustion engine system 24, exhaust gas temperature starts to climb, and LNT components 64 heat.When exhaust gas temperature is close to about 200 degrees Celsius or higher operation temperature, diesel oil cooled activated catalyst structure Part 60 starts to lose NOx emission reduction efficiency.However, by the exhaust gas heating from diesel oil cooled activated catalyst component 60 LNT components 64 arrived efficient operation temperature.In this way, when the efficiency of diesel oil cooled activated catalyst component 60 declines, LNT structures Part 64, which is taken over, carrys out continued reduction NOx emission.
Further according to illustrative aspect, transfer pipe 74 includes being fluidly coupled to the intake section 77 and fluid of outlet 71 Ground is connected to the exit portion 79 of selective catalytic reduction (SCR) system 84.SCR system 84 can also be taken including diesel particulate mistake The SCR system form of biofilter system.SCR system 84 handles the exhaust gas from LNT components 64 with further reduction discharge.SCR System 84 includes the entrance section 86 for the exit portion 79 for being fluidly coupled to transfer pipe 74 and can be connected by exhaust manifolds 94 In the exit section 88 of rear oxidation catalyst (ROC) 91.ROC91 is fluidly coupled to air exit pipeline 36 and operates with oxygen Change the gas of such as CO, HC and NH3 for may be from SCR system 84.
Further one side accoding to exemplary embodiment, diesel emission fluid (DEF) spraying system 114 may be provided at 84 upstream of 64 downstream of LNT components and SCR system.Optionally control DEF spraying systems 114, a certain amount of diesel oil is arranged Body is released to be introduced into for example by the exhaust gas of transfer pipe 74.One side accoding to exemplary embodiment, DEF spraying systems 114 Including urea injector.It should be understood that DEF spraying systems 114 may be configured to introduce various diesel emission fluids Into the exhaust gas by transfer pipe 74.It can be controlled based on the input from each sensor associated with after-treatment system 34 The introducing of diesel emission fluid, with further reduction discharge, especially NOx.
Further according to illustrative aspect, after-treatment system 34 may include being arranged in the entrance 69 of common housing 66 One O2/ NOx sensor 124 and the 2nd O being arranged at the outlet of common housing 66 712/NOxSensor 125.Additionally, first Exhaust gas temperature (EGT) sensor 130 is arranged in entrance 69, and the setting of the 2nd EGT sensors 131 is at outlet 71.In addition, the One differential pressure pickup (DPS) 134 is arranged at the entrance section 86 of SCR system 84, and the 2nd DPS135 is arranged in SCR system 84 Exit section 88 at.Each of the sensor may connect to controller (not shown), and the controller can be used to control Various aspects of turbocharger 40, such as waste gate position, DEF spraying systems 114 etc..
It should be understood that exemplary embodiment describes a kind of be used for simultaneously in cold-start phase and normal operation conditions phase Between also reason internal combustion engine generate NOx emission system.(diesel oil cold start-up is catalyzed the diesel oil cooled activated catalyst of the present invention Agent) component is positioned to handle the exhaust gas during cold start-up or gas at a temperature of below about 200 DEG C simultaneously, and provides Pre-add hot function for the poor NOx trap for being located in downstream.In this way, exemplary embodiment is eliminated for electronic preheating The demand of device, the electronic pre-heater must be operated to preheat LNT components.In addition, the specific structure of component provides widely Emission restores, and covers for example, less than about 200 DEG C of cold start-up and such as delivery temperature is greater than about 200 DEG C of normal operating, To meet new emission regulation.
Term " about " be intended to include with based on submit apply when available equipment it is associated to the measurement of particular magnitude Error degree.For example, " about " may include ± 8% or 5% or 2% range of given numerical value.For example, term " about " should be understood to Generally indicating for temperature value is indicated, because specific temperature numerical value may depend on various system limitations, used material etc..
Although disclosed above be described with reference to exemplary embodiment, it will be understood by those skilled in the art that It can be variously modified and each element of the alternative present invention of equivalent, without departing from the scope of the present invention.In addition, can make Many modifications, so that specific condition or material are adapted to teachings of the present invention, without departing from the base region of the present invention.Cause This, the present invention is not intended to be limited to disclosed specific embodiment, but will include all realities fallen within the scope of the present application Apply example.

Claims (10)

1. a kind of after-treatment system for internal combustion engine comprising：
Diesel oil cooled activated catalyst component；
Poor NOx trap (LNT) component, the LNT components are positioned in close proximity to the diesel oil cooled activated catalyst and are arranged Diesel oil cooled activated catalyst downstream；And
Selective catalytic reduction (SCR) component, the SCR components are arranged in the downstream LNT, wherein the diesel oil cold start-up Catalyst is operable with the reducing NOx emissions object under the operation temperature less than 200 DEG C, and SCR system it is operable with higher than Reducing NOx emissions object under 200 DEG C of operation temperature.
2. after-treatment system according to claim 1, further comprises：Diesel emission fluid (DEF) spraying system, it is described DEF spraying systems are operable being introduced into diesel emission fluid in the exhaust gas generated by the internal combustion engine.
3. after-treatment system according to claim 2, wherein the DEF spraying systems are arranged in the downstream LNT and institute State the upstreams SCR.
4. after-treatment system according to claim 2, further comprises：Transfer pipe, the transfer pipe are cold by the diesel oil Start catalyst and the LNT and SCR is fluidly connected.
5. after-treatment system according to claim 3, wherein the DEF spraying systems are fluidly coupled to the transfer Pipe.
6. after-treatment system according to claim 2, wherein the DEF spraying systems include urea injector.
7. after-treatment system according to claim 1, further comprises：It is arranged in diesel oil cooled activated catalyst upstream O2/NOx sensors and exhaust gas temperature (EGT) sensor it is at least one, and be arranged the downstream LNT O2/NOx biography Sensor and EGT sensors it is at least one.
8. after-treatment system according to claim 1, further comprises：The first pressure difference biography in the upstreams SCR is set Sensor (DPS) and the 2nd DPS in the downstreams SCR is set.
9. after-treatment system according to claim 1, wherein the diesel oil cooled activated catalyst and LNT are arranged common Shell in.
10. after-treatment system according to claim 1, further comprises：Rear oxidation catalysis in the downstreams SCR is set Agent (ROC).
CN201810195190.5A 2017-03-23 2018-03-09 After-treatment system for motor vehicles Pending CN108625948A (en)

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