CN110344917A - Method for running exhausted gas post-processing system - Google Patents

Method for running exhausted gas post-processing system Download PDF

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Publication number
CN110344917A
CN110344917A CN201910271331.1A CN201910271331A CN110344917A CN 110344917 A CN110344917 A CN 110344917A CN 201910271331 A CN201910271331 A CN 201910271331A CN 110344917 A CN110344917 A CN 110344917A
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China
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scr
catalyst converter
carbon black
temperature
black pellet
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Granted
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CN201910271331.1A
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CN110344917B (en
Inventor
C.奥泽曼
O.A.皮特纳
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • 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
    • F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
    • 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
    • F01N3/10—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]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • 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
    • 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
    • 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
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • F01N2900/1404—Exhaust gas temperature
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1602—Temperature of exhaust gas apparatus
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1621—Catalyst conversion efficiency
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1812—Flow rate
    • 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
    • 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)
  • Analytical Chemistry (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

The present invention relates to a kind of method for running exhausted gas post-processing system, the exhausted gas post-processing system is used for internal combustion engine (1), includes the following steps: the first temperature (T for passing through the first temperature sensor measurement (100) carbon black pellet filter upstream when starting1), and at the same time measuring the second temperature (T of (101) the 2nd SCR- catalyst converter upstreams by second temperature sensor2).If the first temperature (T1) it is higher than first threshold (S1), and the second temperature (T2) it is higher than second threshold (S2), then (130) are interrupted to the dispensing of reducing agent solution for the first SCR- catalyst converter by the first dispensing valve, and alternatively, the dispensing (140) of whole reducing agent solution required for the reduction for nitrogen oxides is executed by the second dispensing valve.Finally, carrying out passive regeneration (160) to the carbon black pellet filter.

Description

Method for running exhausted gas post-processing system
Technical field
The present invention relates to a kind of methods for running exhausted gas post-processing system, wherein controls carbon black according to exhaust gas temperature The regeneration of particulate filter.The invention further relates to a kind of to execute each step of this method when this method is run on computers Computer program and a kind of machine readable storage medium that store the computer program.Finally, the present invention relates to one Kind is configured for implementing the controller of electronics in the present inventive method.
Background technique
Nowadays, a variety of different catalyst converters have been used for exhausted gas post-processing system.Carbon black pellet filter reduces exhaust gas In the particulate emission that generates in burning.These particles be mostly based on carbon, but mostly also have other aggregates (Agglomerationen) and health, particularly referred to as fine particle or most fine particle or also referred to as subtle are harmful to The particle of dust and there is the diameter that is so small, so that they are able to enter in the respiratory tract of people.These particles are borrowed The filter material helped in carbon black pellet filter is captured, and adheres to (festhalten) on it.Typically nowadays use Carbon black pellet filter there is the ceramic module full of siding (wanddurchflutete) as filtering material, wherein Particle is trapped in porous ceramics.In order to particle again removed from carbon black pellet filter, to carbon black pellet filter into Exhaust gas is heated to so high temperature (being 500 DEG C or more for oxygen), so that particle burning in regeneration by row regeneration.? When passive regeneration, using nitrogen dioxide, so as to the particle burning based on carbon at carbon dioxide and nitric oxide.The process is in temperature Degree carries out between 250 DEG C and 500 DEG C, wherein is contemplated to be optimal between 300 DEG C and 350 DEG C.It is required Nitrogen dioxide pass through the component, such as oxidation catalyzer or the nitrogen oxides-storage catalytic that are present in exhausted gas post-processing system Device aoxidizes nitric oxide present in exhaust gas particularly by oxygen and is generated, the oxidation catalyzer or nitrogen oxidation Object-accumulator-type catalytic converter in the unloaded state preferably so that nitrogen dioxide chemical combination and form nitrogen dioxide in the saturated condition.
Furthermore use SCR- catalyst converter, by SCR- method (Selective Catalytic REduction it) restores Nitrogen oxides (NOx) in exhaust gas.103 46 220 A1 of DE describes basic principle.Here, urea-water -32.5% is molten Liquid (HWL)-is commercially also AdBlue®Match and is given in exhaust gas.Typically, it is provided with the allocating system with dispensing module thus, It is given in waste gas stream so that HWL is matched in SCR- catalyst converter upstream.(abspalten) ammonia is cracked out by HWL, ammonia is then in SCR- Chemical combination on the reactive surfaces of catalyst converter.There, thus ammonia and nitroxide compounds generate water and nitrogen.HWL is conveyed by band The conveyor module of pump is transported to dispensing module via pressure piping from reducing agent tank.
If SCR- catalyst converter construction is before carbon black pellet filter or the reactive surfaces structure of SCR- catalyst converter It makes on carbon black pellet filter, then SCR- method reduction available nitrogen oxygen for the passive regeneration of carbon black pellet filter Compound.
Nowadays, especially particle-discharge and nitrogen oxides-discharge is due to their unwholesome effects and by stringent Control.In order to check and monitor discharge, test method is used in vehicular field, wherein examined during the driving period discharge It is disconnected.Nowadays important test method includes: test loop " Worldwide harmonized Light Duty Test Cycle (the unified light load test loop in the whole world) " (WLTC), wherein different driving patterns is checked with standard method, these Driving pattern simulates the different driving conditions with different travel speeds；With inspection method " Real Driving The practical driving discharge of Emissions() " (RDE), it checks and is not going the same way under actual traffic situation in actual travel operation Discharge in section.
Summary of the invention
The present invention relates to a kind of exhausted gas post-processing systems for internal combustion engine comprising such as lower component, but is not limited to this A little components:
Carbon black pellet filter, two sseparated SCR- catalyst converters and relevant dispensing valve and temperature sensor.These components The downstream of internal combustion engine is arranged in the exhaust gas system of internal combustion engine.
First SCR- catalyst converter is arranged in the upstream of carbon black pellet filter, or is arranged in carbon black pellet filter. In carbon black pellet filter means that: the reactive surfaces of SCR- catalyst converter, i.e., the surface where when nitrogen oxides is reduced It is arranged on the surface of the filtration device structure of carbon black pellet filter.In other words, this charcoal is given with the surface of SCR- catalyst converter Black particulate filter coating, and carbon black pellet filter, such as SDPF(because being referred to herein as SCR- coatingSelective Catalytic Reduction Diesel Partikel FIlter).Especially for the ceramic module for being full of siding, SCR- The catalytic surface of catalyst converter is arranged on the inner surface for extending through the channel of porous material.First dispensing valve is arranged in first The upstream of SCR- catalyst converter, and reducing agent solution is supplied to the first SCR- catalysis as a part of the first dispensing module Device, mode, which are that it matches reducing agent solution in the upstream of the first SCR- catalyst converter, to be given in exhaust gas system.
2nd SCR- catalyst converter is arranged in the downstream of carbon black pellet filter, and restores and have already passed through the first SCR- catalysis The nitrogen oxides of device.Second dispensing valve is arranged in upstream and the first SCR- catalyst converter of the 2nd SCR- catalyst converter in exhaust gas system Downstream, the downstream for also preferably being disposed on carbon black pellet filter.Second dispensing valve as the second dispensing module a part to the Two SCR- catalyst converters provide reducing agent solution, and mode is that it is in the upstream of the 2nd SCR- catalyst converter reducing agent solution dispensing Into exhaust gas system.Second dispensing valve can be controlled independently of the first dispensing valve, wherein preferably two dispensing valve settings Combined ration policy.
First temperature sensor is arranged in the upstream of carbon black pellet filter, and also preferably is disposed on the first SCR- catalysis The upstream of device, and the temperature of exhaust gas is measured there.Second temperature sensor is arranged in the downstream and of carbon black pellet filter The upstream of two SCR- catalyst converters, and it is preferably placed in the upstream of the second dispensing valve, and measure the temperature of exhaust gas there.
It is proposed a kind of method for running this exhausted gas post-processing system.This method comprises the following steps:
The temperature of first temperature sensor measurement carbon black pellet filter upstream, and second temperature sensor measures the 2nd SCR- The second temperature of catalyst converter upstream.If on the one hand the first temperature is higher than first threshold, and another aspect second temperature is higher than Second threshold then interrupts the dispensing to reducing agent solution by the first dispensing valve.In other words, if the first temperature is higher than simultaneously First threshold and second temperature are higher than second threshold, then do not pass through the first dispensing valve dispensing reducing agent solution.Two threshold values can With difference, and it has been provided below and these threshold values has been preferably selected.As a result, no longer by the first SCR- catalyst converter to nitrogen oxidation Object is restored, particularly is not also restored to nitrogen dioxide.
The dispensing of reducing agent solution required for reduction to nitrogen oxides passes through the progress of the second dispensing valve completely, thus single Solely nitrogen oxides is restored by the 2nd SCR- catalyst converter.The thus enough reducing agent solutions of dispensing, it is desired to obtain Transformation efficiency of the oxides of nitrogen, therefore to restore desired amount of nitrogen oxides, and nitrogen oxides-discharge is decreased to can be pre- First given or previously given degree.
Finally, executing the passive regeneration of carbon black pellet filter.As a result, since the first SCR- catalyst converter is not by nitrogen oxidation Object reduction, compared to traditional passive regeneration-wherein nitrogen oxides quality because by the first SCR- catalyst converter restore due to reduce-have The nitrogen dioxide of more multimass is for carbon black pellet filter for regenerating.As a result, to the passive regeneration of carbon black pellet filter It is more efficient, and can carry out at a lower temperature, but simultaneously, nitrogen oxides-discharge is kept due to the 2nd SCR- catalyst converter In degree that can be previously given or previously given.
For motor vehicle, an advantage is relatively thus obtained with KI- factor.KI- factor is according to formula 1 respectively in WLTC- Be calculated as being mounted in test the particulate filter of carbon black in regeneration (Mpi) during the quality of (carbon black) particle averagely sought The quotient of the quality of (carbon black) particle averagely sought when without regeneration with the particulate filter of unloaded:(formula 1).
WLTC- test during active regeneration when result use until realizing the carbon black-implemented of particulate filter The number of required WLTC- circulation is weighted when loading.Then computationally (rechnerisch's KI- factor) directly exists (einfliessen) is influenced in the limiting value determination recycled for RDE.Here, will be for (legal) regulation of RDE- circulation Limiting value reduce the amount (Betrag) of KI- factor until suitable limiting value.Therefore, KI- factor is smaller, provides in RDE- Particle-discharge of middle permission is more.If passive regeneration carries out more frequently and effective, provide the advantage that Until realizing the number of required WLTC- circulation when the carbon black-loading of particulate filter implemented thus according to exhaust gas The frame conditions of after-treatment system can significantly improve, it is possible thereby to reduce KI- factor.
As another advantage for the passive regeneration frequently and effectively implemented, it is regenerated to reduce active (aktiven) Share.More fuel are consumed, in active regeneration to reach for higher temperature required for active regeneration.In addition, this Cause the function durability of the catalytic module in exhausted gas post-processing system to improve, the durability of oxidation catalyzer is particularly caused to mention Height, and it is component aging smaller.In addition, this also causes the durability of internal combustion engine to improve, because in passive regeneration to internal combustion engine Or the available maintenance of lubrication of its component, and in active regeneration due to passing through the more fuel of post-injection (to mention High-temperature) keep lubricating oil thin and reduces lubricating ability.
In addition, carbon dioxide-discharge is equally reduced, because as previously mentioned, consuming in passive regeneration compared to active regeneration With less for improving the fuel of temperature, carbon dioxide is thereby produced, and passive regeneration is more frequent and more effectively real It applies.
It is provided according to one aspect, improves charcoal by oxidation catalyzer and/or nitrogen oxides-accumulator-type catalytic converter of saturation Nitrogen dioxide-concentration of black particulate filter upstream.Oxidation catalyzer is oxidation of nitric oxide present in exhaust gas at titanium dioxide Nitrogen.Nitrogen oxides-accumulator-type catalytic converter forms dioxy in the unloaded state preferably by nitrogen dioxide chemical combination in the saturated condition Change nitrogen, so that it aoxidizes ground effect.Therefore the nitrogen dioxide of more multimass is used for the passive regeneration of carbon black pellet filter, And the first SCR- catalyst converter will not at least be made to overload.
The first threshold of first temperature is preferably so chosen, thus nitrogen dioxide, particularly the shape in oxidation catalyzer At period and by heating power during carbon black pellet filter stable, and carbon black pellet filter can be carried out passive Regeneration.On the other hand, the first threshold of the first temperature is not so high, so that nitrogen dioxide is by hot force resolution.For two Nitrogen oxide, the critical-temperature that heating power decomposes is about 450 DEG C.It is preferred that avoiding exceeding the critical-temperature.Therefore, the first of the first temperature Threshold value be preferably between 250 DEG C and 450 DEG C within the temperature range of, particularly preferably in temperature model between 350 DEG C and 450 DEG C In enclosing.
The first threshold of second temperature preferably so selects, so that the reduction of nitrogen oxides can pass through second completely SCR- catalyst converter executes.The transformation efficiency of the oxides of nitrogen of SCR- catalyst converter is related with the temperature of SCR- catalyst converter.2nd SCR- catalysis The temperature of exhaust gas at device must be sufficiently high, so that the transformation efficiency of the oxides of nitrogen of the 2nd SCR- catalyst converter is sufficiently large, so as to nitrogen Oxide is reduced to desired quality.Therefore, the second threshold of second temperature is preferably higher than 220 DEG C of temperature.
If the 2nd SCR- catalyst converter cannot bear the reduction to nitrogen oxides completely, i.e., if the 2nd SCR- catalyst converter Not up to desired transformation efficiency of the oxides of nitrogen, then to the dispensing of reducing agent solution by the first dispensing valve carry out, particularly with It is simultaneously carried out by the dispensing of the second dispensing valve.
Computer program is set up to especially this method and executes the method when executing on computer or controller Each step.It may be implemented to implement the method in the controller of traditional electronics, without carrying out changing in structure to it Become.Computer program is stored on machine readable storage medium thus.
By running computer program on the controller of traditional electronics, a kind of controller of electronics is obtained, is set Found into operation exhausted gas post-processing system.
Detailed description of the invention
The embodiment of the present invention is shown in the accompanying drawings, and is described in detail in subsequent instruction.
Fig. 1 is the schematic diagram of the exhausted gas post-processing system for internal combustion engine, which can be by by this The embodiment of the method for invention is run；
Fig. 2 is the flow chart of embodiment in the present inventive method.
Specific embodiment
Fig. 1 show the schematic diagram of the exhausted gas post-processing system for internal combustion engine 1 of unshowned motor vehicle.Give the internal combustion At least one injector 11 (zuordnen) in the arranging of machine 1, by least one injector with this known manner fuel It is ejected into the cylinder 12 of internal combustion engine 1, wherein and then fuel combustion and harmful substance is generated herein.Exhausted gas post-processing system cloth It sets in the exhaust gas system 2 of internal combustion engine 1, and is applied in the harmful substance that (ausgesto enen) is discharged by internal combustion engine 1.It is useless Gas after-treatment system includes carbon black pellet filter 3, is in particular situations diesel oil (carbon black) particle filtering for diesel engine Device (DPF), has been implemented within the first SCR- catalyst converter 4.More precisely, the reactive table of the first SCR- catalyst converter 4 Face is arranged on its filter cell not shown here.Therefore, no matter carbon black pellet filter 3 or the first SCR- catalyst converter 4 are all applied on the exhaust gas in the chamber of carbon black pellet filter 3 simultaneously.In other embodiments not shown here, the One SCR- catalyst converter 4 is configured to individual component, and the upstream of carbon black pellet filter 3 is arranged in exhaust gas system 2.In order to SCR- catalyst converter can restore nitrogen oxides, which needs reducing agent solution, which can pass through First dispensing valve 41 is matched in the upstream of the first SCR- catalyst converter 4 to be given in exhaust gas system 2.
In the upstream of carbon black pellet filter 3 and the first dispensing valve 41, oxidation catalyzer 5 is arranged, then for diesel engine Specially diesel oxidation catalyst (DOC), the oxidation catalyzer is the harmful substance being present in exhaust gas especially carbon monoxide And oxidizing hydrocarbon.In addition, oxidation catalyzer 5 is also oxidation of nitric oxide at nitrogen dioxide, which is used for charcoal Passive (passive) of black particulate filter regenerates.Between oxidation catalyzer 5 and carbon black pellet filter 3, and in the reality It applies in example in the upstream of the first dispensing valve 41, arranges the first temperature sensor 6, first temperature sensor measurement is in carbon black First temperature T of the exhaust gas of the entrance of grain filter 31。
Other than the first SCR- catalyst converter 4-it is generally also also referred to as close since it is arranged in the exit of internal combustion engine 1 The SCR- catalyst converter-of motor, in the arranged downstream of the first SCR- catalyst converter 4 and carbon black pellet filter 3 in exhaust gas system 2 Two SCR- catalyst converters 7.2nd SCR- catalyst converter 7 especially is configured for fully bearing to nitrogen oxygen in terms of its volume The reduction of compound.The second dispensing valve 71 is arranged to the 2nd SCR- catalyst converter 7, which is arranged in the 2nd SCR- and urges Change the upstream of device 7 and the downstream of the first SCR- catalyst converter 4, and by second dispensing valve for the 2nd SCR- catalyst converter 7 Reducing agent solution with being given in exhaust gas system 2.Second temperature sensor 8 is arranged in the downstream and second of carbon black pellet filter 3 The upstream of dispensing valve 71, and the second temperature T of exhaust gas is measured there2。
Two temperature sensors 6,8 are connect with the controller 9 of electronics, and the temperature T measured1、T2It is sent to the control Device.In addition, the controller of electronics and two dispensing valves 41,71 and its with the conveying and allocating system for reducing agent solution Its component not shown here connection, and can be controlled independently of one another by two dispensing valves 41,71 molten to reducing agent The dispensing of liquid.Finally, controller is connect with injector 11, and it can control the fuel quantity of penetrating.In addition to internal combustion engine 1 power and Outside the harmful substance of discharge, the temperature of exhaust gas can also be changed by the fuel quantity of penetrating.
Fig. 2 is the flow chart of embodiment in the present inventive method.When starting, not only pass through the first temperature sensor 6 couple of first temperature T1100 are measured, and by second temperature sensor 8 to second temperature T2Measure 101.Then handle First temperature T1With first threshold S1Compare 110.First threshold S1Be in temperature be 250 DEG C when, in the temperature, in oxygen Changing the nitrogen dioxide formed in catalyst converter 5 is stable on heating power (thermodynamisch), and is filtered to carbon black pellet Device 3 carries out passive regeneration, in regeneration, based on the carbon black of carbon (kohlenstoffbasierte) in nitrogen dioxide and oxygen Under the action of burn into nitric oxide and carbon dioxide.First threshold S higher than 450 DEG C1It will lead to the heating power of nitrogen dioxide It decomposes (Zerfall).Meanwhile second temperature T2With second threshold S2Compare 111.Second threshold S2It so chooses, thus nitrogen The reduction of oxide can be executed by the 2nd SCR- catalyst converter 7 completely.For this purpose, seeking second threshold S by model 2002, the mould Type is directed to the desired transformation efficiency of the oxides of nitrogen η of at least the 2nd SCR- catalyst converter 7w.Transformation efficiency of the oxides of nitrogen is usually with second Temperature T2It is related, therefore according to temperature and especially in view of thermal capacity (W rmekapazit ten), the matter in exhaust gas The model 200 is chosen in the case of amount and heat loss.Second threshold S2It so chooses, thus in desired transformation efficiency of the oxides of nitrogen ηwIn the case of, nitrogen oxides-discharge is reduced to the degree in the limiting value allowed.In this embodiment, at second threshold When temperature is 220 DEG C.
If no matter the first temperature T or second temperature T2All simultaneously above being assigned to it respectively comparing in 110 or 111 Threshold value S1Or S2, then 130 dispensings are interrupted by the first dispensing valve 41.In other words, two comparisons 110 or 111 meet logic With-relationship.If two temperature one of only T1Or T2Lower than being assigned to their threshold value S1Or S2, then continue in the usual manner 120 dispensings.Nevertheless, the Regenerated energy of particulate filter 3 occurs 121 in the usual manner.If passing through the first dispensing valve 41 130 dispensings are interrupted, then the first SCR- catalyst converter 4 no longer restores nitrogen oxides, also without nitrogen dioxide.
But in order to continue nitrogen oxides reduction, the complete dispensing of the second dispensing valve 71 is gone back to pass through the 2nd SCR- catalyst converter 7 The reducing agent solution of all-mass required for former nitrogen oxides.For whole reducing agent solution required for nitrogen oxides reduction Quality by desired transformation efficiency of the oxides of nitrogen ηwIt seeks, wherein nitrogen oxides-discharge is reduced in the limiting value allowed Interior degree.Desired transformation efficiency of the oxides of nitrogen ηwAnd by the model 200 introduced, particularly according to second temperature T2With The other parameters of two SCR- catalyst converters 7 are sought.Therefore, the independent nitrogen oxides reduction of the 2nd SCR- catalyst converter 7 exactly makes Nitrogen oxides-discharge is obtained to be in the limiting value allowed.
Then, passive regeneration 150 is carried out to carbon black pellet filter 3, wherein inside carbon black pellet filter 3 The carbon black pellet of deposition (ablagern) is with the nitrogen dioxide generated in oxidation catalyzer 5 in the first temperature T1Higher than the first threshold Value S1In the case where with oxygen one react into carbon dioxide and nitric oxide, the nitrogen dioxide is due to passing through the first dispensing valve 41 interruption dispensings and related to this reduction of SCR- catalyst converter 4 does not occur and enters carbon black pellet filter with not reducing In 3, the oxygen had not participated in the burning in internal combustion engine 1 and had been present in exhaust gas.
During the regeneration 150 by 41 dispensing of the second dispensing valve, 140 reducing agent quality and carbon black pellet filter 3, hold The practical transformation efficiency of the oxides of nitrogen η of 160 the 2nd SCR- catalyst converters is sought long2.In the passive regeneration of carbon black pellet filter 3 During 150, comparing the practical transformation efficiency of the oxides of nitrogen η that the 2nd SCR- catalyst converter is checked in 1702Whether desired nitrogen is lower than Oxide conversion ratio ηw, must be realized by the 2nd SCR- catalyst converter 7, so that nitrogen oxides-discharge is reduced in permission Limiting value in degree.As described, the desired transformation efficiency of the oxides of nitrogen ηwIt is sought by module 200.If practical nitrogen oxygen Compound conversion ratio η2Lower than desired transformation efficiency of the oxides of nitrogen ηw, just no longer reduction is extremely in the pole allowed for nitrogen oxides-discharge Degree in limit value.Therefore, dispensing 180 is carried out by the first dispensing valve 4, thus generally by two SCR- catalyst converters 4,7 Realize desired transformation efficiency of the oxides of nitrogen ηw, and nitrogen oxides-discharge is reduced to the degree in the limiting value allowed.

Claims (8)

1. a kind of method for running exhausted gas post-processing system, the exhausted gas post-processing system is used for internal combustion engine (1), described useless Gas after-treatment system includes:
Carbon black pellet filter (3)；
- the one SCR- catalyst converter (4), is arranged in the upstream of the carbon black pellet filter (3), or is arranged in the charcoal In black particulate filter (3)；
The first dispensing valve (41) in the first SCR- catalyst converter (4) upstream is mentioned to the first SCR- catalyst converter (4) For reducing agent solution；
The first temperature sensor (6) in carbon black pellet filter (3) upstream；
- the two SCR- catalyst converter (7) is arranged in the downstream of the carbon black pellet filter (3)；
In the 2nd SCR- catalyst converter (7) upstream and the second dispensing valve in the first SCR- catalyst converter (4) downstream (71), reducing agent solution is provided to the 2nd SCR- catalyst converter (7) independently of first dispensing valve (41)；With
It is sensed in carbon black pellet filter (4) downstream and in the second temperature of the 2nd SCR- catalyst converter (7) upstream Device (8),
It is characterized in that following steps:
First temperature of (100) described carbon black pellet filter (3) upstream is measured by first temperature sensor (6) (T1)；
The second temperature of (101) described 2nd SCR- catalyst converter (7) upstream is measured by the second temperature sensor (8) (T2)；
If the first temperature (T1) it is higher than first threshold (S1) and the second temperature (T2) it is higher than second threshold (S2), (130) are then interrupted to the dispensing of reducing agent solution by first dispensing valve (4)；
It is molten by whole reducing agent required for reduction of the second dispensing valve (71) dispensing (140) for nitrogen oxides Liquid；
Passively regenerate (160) described carbon black pellet filter (3).
2. method according to claim 1, which is characterized in that urged by oxidation catalyzer (5) and/or nitrogen oxides-storage Change device to improve nitrogen dioxide-concentration of carbon black pellet filter upstream.
3. method as any one of preceding claims, which is characterized in that the first threshold (S1) so choose, from And nitrogen dioxide is stable on heating power, and passive regeneration can be carried out to the carbon black pellet filter (3).
4. method as any one of preceding claims, which is characterized in that the second threshold (S2) so choose, from And the reduction of nitrogen oxides can be executed by the 2nd SCR- catalyst converter (71) completely.
5. method as any one of preceding claims, which is characterized in that if the 2nd SCR- catalyst converter (7) is not Reach desired transformation efficiency of the oxides of nitrogen (ηw), then dispensing is carried out to reducing agent solution by first dispensing valve (41) (180).
6. a kind of computer program is set up to execute according to claim 1 to each step of any one of 5 the methods.
7. a kind of machine readable storage medium, stores computer program according to claim 6 thereon.
8. a kind of controller of electronics (9), it is configured for by being transported according to claim 1 to any one of 5 the methods Row is used for the exhausted gas post-processing system of internal combustion engine (1).
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