CN101454547A - Operation method and device of tail-gas secondary treatment device - Google Patents

Operation method and device of tail-gas secondary treatment device Download PDF

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Publication number
CN101454547A
CN101454547A CNA2007800194433A CN200780019443A CN101454547A CN 101454547 A CN101454547 A CN 101454547A CN A2007800194433 A CNA2007800194433 A CN A2007800194433A CN 200780019443 A CN200780019443 A CN 200780019443A CN 101454547 A CN101454547 A CN 101454547A
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oxygen
tail
secondary treatment
oxygen storage
probe
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CN101454547B (en
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克里斯多佛·塞维营
于尔根·施尼茨勒
安德里亚·维亚尔塔拉
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FEV Europe GmbH
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FEV Motorentechnik GmbH and Co KG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • 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
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the 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
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration downstream of the 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
    • F01N13/0097—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 arranged in a single housing
    • 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
    • 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
    • F01N3/0821—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with particulate 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
    • 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
    • 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
    • F01N3/0807—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
    • F01N3/0864—Oxygen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • F01N3/0885—Regeneration of deteriorated absorbents or adsorbents, e.g. desulfurization of NOx traps
    • 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
    • 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
    • F02D41/0295—Control according to the amount of oxygen that is stored on the 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
    • 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
    • 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
    • F02D2200/0802—Temperature of the exhaust gas treatment apparatus
    • 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
    • F02D2200/0814—Oxygen storage amount
    • 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
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D41/1408—Dithering techniques
    • 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)
  • Emergency Medicine (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The invention relates to a method for operating a motor vehicle exhaust-gas aftertreatment system (1), in which oxygen is fed to and removed from the oxygen tank (8) of an exhaust-gas aftertreatment component (7). According to the invention, the oxygen quantity in the oxygen tank (8) is determined and a rich-lean cycle is influenced in accordance with the determined oxygen quantity. The invention also relates to a motor vehicle exhaust-gas aftertreatment system (1), which permits a temperature regulation of the oxygen tank (8) and/or an uninterrupted desulphation during the transition between a rich operation and a lean operation.

Description

The operation method of device of tail-gas secondary treatment and device
Technical field
The present invention relates to a kind of operation method and a kind of device of tail-gas secondary treatment of vehicle exhaust secondary treatment equipment, described device of tail-gas secondary treatment comprises the internal-combustion engine that joins with it.
Background technique
US 6 843 052 discloses the oxygen storage that can be used for tail gas secondary treatment constituent element rich oil-oil-poor cycle, so that oxidation H2S.Described oxygen storage will be filled in the oil-poor cycle, and be drained at least in part in the cycle at rich oil.In order to adjust the oxygen amount, utilized the λ probe in the downstream that is arranged on tail gas secondary treatment constituent element.If here find substoichiometric air ratio (
Figure A200780019443D0006183624QIETU
), then start oil-poor transition.If superstoichiometric air ratio (
Figure A200780019443D0006183644QIETU
), start rich oil transition.Among EP0 893 154 B1, also adopted to be connected on nitrogen oxides storage catalyst converter (NSK) oxygen storage afterwards and to carry the oxygen that is used for oxidation H2S.
DE 197 47 222 C1 openly have the internal-combustion engine machine equipment of NSK and secondary blast means and the sulfur method of NSK.In this system, the desulfurization controller is controlled by the output signal of the λ probe that is arranged in the downstream.
DE 198 27 195 A1 are disclosed to be, temporarily occurs sulfur dioxide when rich oil-oil-poor transition earlier, postpones to generate H2S subsequently.The discharging of H2S thereby can suppress by rich oil-oil-poor transition as early as possible.
DE 101 26 455 A1 have described the NSK sulfur method, and it follows the regeneration of particulate filter closely, cancel or foreshorten to the heating of desulfurization temperature thus.
DE 199 22 962 C2 are disclosed to be, the air ratio in the tail gas can be adjusted by secondary blast in the NSK sweetening process.
Adjustment of learning from above file or control theory relate to the λ probe signal that portion downstream is formed in oxygen storage exhaust branch pipe.But especially at high temperature, have only when the oxygen storage is full of (λ〉1) fully or is emptied completely (λ＜1), the λ probe just is not equal to 1 this moment.As a result, for example when desulfurization, can occur happening suddenly with the rich oil of H2S discharging.
Summary of the invention
Task of the present invention is the improvement that realizes the operation conditions of device of tail-gas secondary treatment, and it is especially considered the actual state in the device of tail-gas secondary treatment and can make rapid and reliable reaction.
This task is to solve by the method for the feature with claim 1 and by the tail gas secondary treatment constituent element of the feature with claim 19.Other favourable designs will provide in the corresponding dependent claims.
According to the present invention, a kind of operation method of vehicle exhaust secondary treatment equipment is proposed, wherein oxygen is supplied to the oxygen storage of tail gas secondary treatment constituent element and is removed, here, at least one parameter that determine by oxygen storage and oxygen amount thereof, that self change is determined and to be in the operation method of vehicle exhaust secondary treatment equipment and is used.
Preferably determine the oxygen amount in the oxygen storage, and, influence rich oil-oil-poor cycle according to determined oxygen amount according to an improvement project.For example, the oxygen amount in the oxygen storage can be used as parameter and is incorporated in the adjustment in rich oil-oil-poor cycle.An exemplary design scheme regulation is used for rich oil-oil-poor cycle with the oxygen amount as adjusting parameter or controlling parameter.Another exemplary design scheme regulation, the oxygen amount in the oxygen storage was preferably adjusted by different rich oils-oil-poor cycle by at least one rich oil-oil-poor cycle.A feasible flexible program has engine control system, and its control or adjustment rich oil-oil-poor cycle, here, the oxygen amount in the oxygen storage is with controlled or adjustment.For this reason, engine control system for example can involve numerous characteristics family of curves or determine with oxygen continuous or that batch process is finished.
Especially consider the relative cylinder charge of oxygen storage.Thereby, with the control of independent constituent element or main assembly partial correlation connection or adjust, be not only for example to consider the λ probe signal.Take in but give prominence to according to the actual state of oxygen storage, if its can be for example at the discharge oxygen in service in rich oil stage in rich oil-oil-poor cycle, otherwise or, in the oil-poor stage in rich oil-oil-poor cycle, can also absorb oxygen.
Can stipulate in addition, add delivery of oxygen to vehicle exhaust secondary treatment equipment according to the determined oxygen amount of oxygen storage.Such oxygen is carried and for example can be finished via air conduit or oxygen catheter to device of tail-gas secondary treatment.Also exist following may, change amount of supplied air in the device of tail-gas secondary treatment by in the internal-combustion engine that is attached thereto, correspondingly blocking valve with for example additionally or also having no truck with.
Preferably calculate the oxygen amount by the oxygen balance around the oxygen storage.This for example can realize by first probe and second probe.First probe is preferably in and is arranged on the flow direction before the oxygen storage, preferably is close to the oxygen storage at least in the upstream.Second probe is preferably in the downstream and is close to the oxygen storage.In addition, in these two probes at least one directly can be placed on the opening of oxygen storage.Also one of them probe at least can be arranged in the oxygen storage.For example, can infer the global storage situation of whole oxygen storage by the local conditions of oxygen storage.
First probe preferably is used to continuous measurement oxygen amount before the oxygen storage.In this case, replace the oxygen amount also can measure oxygen storage air quantity before, infer the oxygen amount thus.Second probe is preferably determined the oxygen amount in the mode in the time lag after the oxygen storage.Preferred test constantly oxygen amount or air ratio.Regulation for example, in these two probes at least on flowing to forward probe be wide band lambda probe (Breitband-Lambda-Sonde).Different therewith, two other probe can be a transition probe (Sprundsonde).But, also can adopt two wide band lambda probes.Preferably one of them probe can also write down temperature.
An improvement project regulation, device of tail-gas secondary treatment is equipped with the controller of oneself.In controller, preferably not only add control or adjustment about the oxygen storage.Be preferably in other component part that also piggybacks tail gas secondary treatment constituent element in the controller.Except the oxygen storage, above-mentioned component part can also be the injection apparatus that injection apparatus in catalyst converter, particulate filter, the device of tail-gas secondary treatment such as injection contain ammoniacal substance etc.A design proposal regulation realizes this functional in engine controller.Another design proposal regulation, controller and engine control system are arranged dividually.
Design proposal regulation, the method are used to realize adjustment targetedly to rich oil-oil-poor cycle with the oxygen amount of storing in the oxygen storage.For example, can be by the heat of filling and discharging in the emptying oxygen memories to change unit time targetedly.Exist for this reason following may, for example can influence the temperature of oxygen storage or comprise the temperature of the constituent element of oxygen storage.
For example stipulate that the regeneration of the tail gas cleaning constituent element of automobile will realize in the predetermined temperature district.When diesel particulate filter (DPF) regeneration and in the desulfurization of nitrogen oxides storage catalyst converter, also be like this for example.If internal-combustion engine for example will be with oil-poor method of operation operation in particulate filter, then particle compiles.Be higher than 500 degrees centigrade temperature for making the particle after-flame, preferably adjusting.If for example adopt uncoated particulate filter, then adopt to be higher than 600 degrees centigrade temperature.If adopt the filter that scribbles catalyzer, then for example go out to be higher than the temperature of 550 ℃ of exhaust temperatures in the particulate filter adjusted.A design proposal regulation adopts rich oil-oil-poor cycle in order to heat up when regenerating.At this moment, the oxygen storage is by periodically to small part filling and emptying.The exchange of the oxygen storage of Shi Xianing will produce heat thus, and this heat is used to heat up.Heat up and for example can before real regeneration, finish, thereby before starting real regeneration, also must have a spot of enthalpy available.For example, the oxygen amount in the oxygen storage is used to produce at least in part for necessary temperature of regeneration and/or intensification.For this reason, the oxygen storage absorbs corresponding oxygen in the stage of excessive supply oxygen, can disengage oxygen subsequently in the regeneration stage.
This and the method for operation that combines of regeneration of oxygen storage is for example supported in a different manner by engine control system and/or independent controller.For example, intensification can so realize, that is, with exhaust temperature at the internal-combustion engine place or even under the turbine rotor situation, improve in the turbo machine outlet port.For example, this can be by dwindling air ratio as realizing by secondary fuel injection, by changing the oil spout angle and realizing by the air of giving motor or turbo machine is carried out throttling in internal-combustion engine.In order to strengthen the intensification effect, can carry unburned or the fuel oxygen supply storage of burn incompletely just.For example, can adopt for this reason the fuel oil secondary is sprayed into the way of internal-combustion engine in the expansion stage.In addition, can regulation fuel oil be sprayed into the release stage.In addition, can directly fuel oil be sprayed into tail gas stream, for example by additional injection.Also can realize the reformation of fuel oil and as the conveying of synthetic gas.For example also have such possibility, that is, for example also additional use liquid gas storage, natural gas storage device or similar device in the automobile with second order drive unit are so that can make corresponding fluid flow in the device of tail-gas secondary treatment thus.
The oxygen of storing in the oxygen storage is for example provided by the surplus oxygen from the motor burning.But, also can regulation ambient air be sent into tail gas.For this reason, for example can utilize secondary blast.Also can utilize the air intake device of internal-combustion engine for this reason.In addition, also can utilize oxygen, so that in the oxygen storage, increase by its oxygen that discharges in other local storage of device of tail-gas secondary treatment.
In device of tail-gas secondary treatment, combustible gas component can transform by the oxygen of enough usefulness, for example only by especially replenishing the oxygen of sending here from the oxygen storage from the oxygen storage, additional from the oxygen storage.When vehicle exhaust secondary treatment equipment operation, will be adjusted to targetedly and use existing oxygen storage in a controlled manner.For example, can carry out temperature control or temperature adjustment, especially work as the time spent of doing that particulate filter might itself play the oxygen storage particulate filter.
Another design proposal regulation in the desulfurization of determined oxygen amount as parameter adding oxide storage with the oxygen storage, is preferred for influencing rich oil-oil-poor cycle.The oxide storage for example can be nitrogen oxides storage catalyst converter and/or oxysulfide storage.In desulfurization, utilized from the oxygen of oxygen storage and carried, be used for for example will being oxidized to sulfur dioxide at the substoichiometric H2S that provides in service.By determining the oxygen amount in the actual at that time oxygen storage, preferably in corresponding operation strategy, add and avoid especially being emptied completely at oil-poor operating oxygen storage.The risk that suppresses the H2S discharging thus.If especially stipulate the oxygen storage should be never by thorough emptying as the operation strategy, then replace the λ probe ground behind the oxygen storage that the transition probe especially also can be set.
Not only be used for desulfurization and/or regeneration initial definite preferably according to the oxygen amount of being considered.But also have following possibility, in order to determine the endurance of desulfurization and/or regeneration, determined oxygen amount is added as parameter.
Best is not only be used for desulfurization and/or regeneration initial definite according to the oxygen amount of being considered, but also has following possibility, in order to determine the endurance of desulfurization and/or regeneration, determined oxygen amount is added as parameter.
According to a design, the oxygen amount in the required oxygen storage of this method is determined by the integration to the oxygen mass flow that transforms with storage.The oxygen mass flow for this reason binding probe especially the difference and the tail-gas quality stream of λ probe calculate.Adopt following formula for this reason:
m . 02 = m . A · L · ( λ vorKat - λ nachKat )
m 02 = ∫ m . 02 dt
Wherein,
m 02-oxygen the quality of being stored
Figure A200780019443D0010184602QIETU
The oxygen mass flow of-conversion
Figure A200780019443D0010184610QIETU
-tail-gas quality stream
L-stoichiometric coefficient
λ-air ratio
Like this or other result of calculations may have error, for example because coarse λ signal or inaccurate tail-gas quality stream, therefore, the oxygen amount of being calculated does not correspond to actual oxygen amount.Error also may further increase in time because of the integration about the time.So the rich oil that may occur not expecting burst or oil-poor burst.Burst as will occurring, the virtual condition that then can come recognition memory in conjunction with such burst will be calculated rollback and be worth to certain.In addition, can provide motivated emergency situations, so that accomplish to measure verification whereby.Also can obtain verification from the running state of oxygen storage.For example, also can transport and check the maximum memory capability state, preferably determine the verification of memory capabilities and the store status of oxygen storage thus by corresponding air or oxygen.
Another improvement project regulation, utilizing the oxygen storage and preferably and in oxygen memory capabilities and the oxygen amount of trying to achieve especially at that time and the storing scope controlling or adjust, determine at least one threshold value, if surpass this threshold value, the cycle that starts between rich oil operation and the oil-poor operation switches.This threshold value can be fixed.But, also can make threshold value adapt to for example wearing out of oxygen storage.For example, when the verification of oxygen storage or when calculating the oxygen memory capabilities, also can impel the threshold value lifting.For example, threshold value is added into the controller of device of tail-gas secondary treatment.But, it for example also can add and be present in the engine control system.Preferably regulation is determined the last lower threshold value about the oxygen amount, and when surpassing threshold value, the cycle that starts between the operation of oil-poor operation and rich oil switches.In this case, the startup that the cycle switches is drafted constantly when reaching threshold value, perhaps after surpassing threshold value.The cycle that is preferably in starts the hysteresis behavior when switching.This means that after the oxygen storage threshold value that reaches at that time, or also absorbed oxygen lentamente before oxygen is paid, perhaps under reverse situation, surrendering of oxygen is delayed, oxygen compiles in the oxygen storage again subsequently.Best regulation can surpass the threshold value of the oxygen amount in the oxygen storage, reach threshold value accidentally, will switch the execution cycle subsequently, relevant oxygen surrender or roadability that the oxygen storage absorbs is turned.
Can stipulate that in addition explosive motor is wherein determined the temperature of oxygen storage and the Operational Limits of the oxygen amount that the determined temperature change influence of foundation is stored according to rich oil-oil-poor periodic duty.Especially, comprise that the temperature control or the temperature adjustment of the tail gas secondary treatment constituent element of oxygen storage can also change the oxygen amount of sending from the oxygen storage in the unit time, so that adapt to the temperature of tail gas secondary treatment constituent element.By utilizing the oxygen storage to adjust under the situation of temperature, for example can adopt the PI regulator.
In addition or the ground that has no truck with, can stipulate the method for operation of vehicle exhaust secondary treatment equipment, and when oxide accumulator-type catalytic converter especially nitrogen oxides storage catalyst converter desulfurization, move rich oil-oil-poor cycle at least in part, note the air ratio behind oxide accumulator-type catalytic converter especially nitrogen oxides storage catalyst converter, here, determine and answer oxygen consuming amount, avoid the not enough stoichiometry and/or the hyperstoichiometry of the air ratio behind oxide accumulator-type catalytic converter especially nitrogen oxides storage catalyst converter.Here, especially will return and trace back to one or more about the oxygen storage capacity in the oxygen storage and scheduled threshold value.For example, a threshold value not only can be arranged, and a plurality of threshold values can be arranged.Have following possibility in this case, temperature that foundation is different or oxygen delivery situation or oxygen absorbing state are moved the oxygen storage.
The method of operation of oxygen storage is included in the tail gas secondary treatment theory of automobile.Therefore, the oxygen storage is positioned in the device of tail-gas secondary treatment as independent component.But, the oxygen storage constituent element of the parts of device of tail-gas secondary treatment preferably.It can be catalyst converter, particulate filter or other parts in device of tail-gas secondary treatment.
According to another imagination of the present invention, a kind of device of tail-gas secondary treatment is proposed, this device of tail-gas secondary treatment comprises the internal-combustion engine that is attached thereto, wherein internal-combustion engine has engine control system, device of tail-gas secondary treatment has at least one controlled catalyst converter and oxygen storage, before the oxygen storage, be provided with first probe, behind the oxygen storage, be provided with second probe, first probe determines to characterize first parameter of oxygen amount, the parameter that first and second probes are write down is transferred to analysis and processing unit by signal, this analysis and processing unit is connected with the engine control system that comprises adjustment or control unit, and rich oil-oil-poor cycle is considered according to determined parameter in this unit.
By such device of tail-gas secondary treatment that comprises the internal-combustion engine that is attached thereto, preferably carry out said method and move vehicle exhaust secondary treatment equipment.
Another improvement project regulation, second probe is a temp probe, the parameter of second probe is incorporated in the control or adjustment of λ value of engine control system.Rich oil-oil-poor cycle preferably adds in the λ control of internal-combustion engine as expected value.
Another design code of device of tail-gas secondary treatment, first and second probes determine to characterize first parameter of oxygen amount respectively, first parameter of first and second probes transfers to analysis and processing unit with signal form, analysis and processing unit is determined second parameter of the oxygen amount of sign oxygen storage from first parameter, engine control system is connected with a device that is used for adjusting the air ratio of device of tail-gas secondary treatment, wherein adjusts air ratio by this device and according to second parameter.
An improvement project regulation of device of tail-gas secondary treatment, the oxygen storage has first portion and second portion, and they are placed in two different tail gas secondary treatment constituent elements at least.For example, the oxygen storage can be made of nitrogen oxide catalyst converter and particulate filter.They also can arrange with being separated from each other.In addition, ternary catalyzing unit also can comprise oxygen storage or its part.A measure probe preferably is set, is used for determining the temperature of oxygen storage.This allows directly to add measured temperature when calculating the oxygen amount of oxygen storage.For example, determined temperature value can be used to check the oxygen amount of for example determining according to oxygen balance.Mode or append mode as an alternative, the determining of oxygen memory temperature also allow to change one or more in the especially above-mentioned threshold value, so that influence rich oil-oil-poor cycle according to the oxygen memory capabilities with temperature correlation.
Description of drawings
Other favourable design and improvement in following accompanying drawing, have been provided.But, each feature that obtains thus is not limited to these designs.These features can combine and the scheme that is improved with other designs of accompanying drawing and the feature in the above-mentioned explanation.Wherein:
Fig. 1 is first schematic representation of first device of tail-gas secondary treatment;
Fig. 2 is the schematic representation that comprises temperature controlled second device of tail-gas secondary treatment;
Fig. 3 is shown in schematic under the situation of the oxygen amount that writes down in each unit time in the oxygen storage of the device of tail-gas secondary treatment that consideration links to each other with internal-combustion engine, changes temperature by changing internal combustion engine operation;
Fig. 4 schematically illustrates control loop, and it adjusts temperature variation by the situation of utilizing that changes the oxygen storage;
Fig. 5 schematically illustrates the 3rd device of tail-gas secondary treatment, and it for example prevents the rich oil burst by calculating the oxygen amount of being stored;
Fig. 6 schematically illustrates the tradition control of catalyst converter, and it also comprises the oxygen storage by the λ probe traditionally, and it is placed in the catalyst converter outlet; And
Fig. 7 represents and the operation of comparing the catalyst converter of change shown in Figure 6 that it plays the effect of oxygen storage under the situation of the oxygen amount of considering to be calculated, and this operation is according to the two point formula control corresponding to the operation method that is proposed.
Embodiment
Fig. 1 schematically illustrates an embodiment of first device of tail-gas secondary treatment 1.Device of tail-gas secondary treatment 1 is placed in the downstream of internal-combustion engine 2.Device of tail-gas secondary treatment 1 has tail gas arm 3, and air intake conduit 4 and additional oil-feed conduit 5 for example are arranged in the tail gas arm.These two conduits 4,5 are placed in first probe 6 especially before the λ probe.Look up at stream, first probe 6 is placed in again before the tail gas secondary treatment constituent element 7.Tail gas secondary treatment constituent element 7 has oxygen storage 8.In addition, tail gas secondary treatment constituent element 7 can have the especially controlled catalyst converter of catalyst converter, nitrogen oxides storage catalyst converter, particle trap, sulphur catcher and/or other and can change parts from the tail gas of internal-combustion engine 2.Oxygen storage 8 has first portion 9 and second portion 10.They for example separately are placed in the zones of different of tail gas secondary treatment constituent element 7.For example, the first portion of oxygen storage 8 can be placed in the particulate filter, and the second portion of oxygen storage 8 is placed in the nitrogen oxides storage catalyst converter.Particulate filter and nitrogen oxides storage catalyst converter for example constitute tail gas secondary treatment constituent element 7 jointly.Being equipped with second probe, 11, the second probes in tail gas secondary treatment constituent element 7 downstreams for example also can be the λ probe.Looking up from stream can be provided with another tail gas secondary treatment constituent element in second probe, 11 back, and it also can have the oxygen storage.For example, second probe 11 not only can be by determining that respective air ratio or oxygen amount behind tail gas secondary treatment constituent element 7 are used to tail gas secondary treatment constituent element 7 when oxygen amount balance, simultaneously, calculate or range of balance in, second probe 11 preferably is used for subsequently tail gas secondary treatment constituent element with same signal as the input parameter of oxygen amount or air ratio.For this reason, being preferably in follow-up tail gas secondary treatment constituent element settles another at this probe that is not shown specifically afterwards.And, can in tail gas secondary treatment constituent element 7, be provided with one or more other probes.For example, one or more probe can constitute one group of second probe 11, if can infer the oxygen amount of balance limit exterior domain by determined balance.By engine control system 12, especially can under the situation of considering oxygen storage 8, change the air ratio in the tail gas arm.Engine control system 12 for example is connected with the independent controller 13 of first device of tail-gas secondary treatment 1.Controller 13 is for example noted from the measured value of different probes and is applied in the analysis and processing unit 14 of oneself.Whereby, for example can determine in esse oxygen amount of storing according to oxygen balance by oxygen storage 8.This value for example can be transferred to engine control system 12.Controller 13 again can be for example adapts to the tail gas strategy relevant with engine control system 12 under the situation of considering determined actual oxygen amount.This for example can comprise importing by controller 13 motivatedly and contains ammoniacal substance.Especially, controller 13 can be regulated rich oil operation in first device of tail-gas secondary treatment 1 and the switching between the oil-poor operation with engine control system 12 under the situation of considering oxygen storage 8.But, according to another design, the controller 13 that illustrates separately functional is added in the engine controller of engine control system 12.
Fig. 2 schematically illustrates second device of tail-gas secondary treatment 15.Second device of tail-gas secondary treatment 15 is connected with control/regulation unit 16, and control/regulation unit 16 is connected with internal-combustion engine 2 again.Control/regulation unit 16 is engine controller preferably, but also can be the controller that is independent of engine controller.Between control/regulation unit 16 and internal-combustion engine 2, can exchange control signal 17 and sensor signal 18.λ probe 19 is placed between internal-combustion engine 2 and the catalyst converter 20, and this catalyst converter comprises oxygen storage 8, is arranged in the upstream on flowing to.By λ probe 19, the signal that characterizes catalyst converter 20 oxygen amount before is fed to control/regulation unit 16.By looking up from stream at the temperature transducer 21 of catalyst converter 20 back, temperature signal also is fed to control/regulation unit 16.By the device of the important component part of the device of tail-gas secondary treatment 15 that only schematically illustrates, can carry out the temperature adjustment of oxygen storage 8.Especially, the device that is made of second device of tail-gas secondary treatment 15 and internal-combustion engine 2 allows according to rich oil-oil-poor periodic duty, rich oil-oil-poor cycle is subjected to influence like this by changing air ratio and/or time, rich oil stage and/or oil-poor stage, so that the oxygen amount from oxygen storage 8 can be changed in the unit time, control or adjust the temperature of oxygen storage 8 and then the temperature of catalyst converter 20 thus.
Fig. 3 schematically illustrates the application of oxygen storage shown in Figure 2 when adjusting the temperature variation of Fig. 1 or oxygen storage 8 shown in Figure 2 for example.Above Fig. 3, represent air ratio lambda among first figure, x axle express time, the y axle is represented air ratio lambda.The below shows the variation of the oxygen amount of storing in the oxygen storage, wherein being parallel to the x axle is that time shaft extends the maximum oxygen memory capabilities that the line that marks is represented the oxygen storage.The below also shows the oxygen amount that the quilt from the oxygen storage transforms according to time of x axle.Below again according to time representation oxygen storage or comprise the temperature variation of the catalyst converter of oxygen storage.In the view of Fig. 3, be shown to contrast two different rich oils-oil-poor cycle mutually.First rich oil-oil-poor cycle A represents with solid line in the view of the top side of Fig. 3.Second rich oil-oil-poor cycle B dots.The fine rule that is parallel to the extension of x axle is represented air ratio lambda=1 in the figure of the top side of Fig. 3.The difference of two rich oil-oil-poor cycle A, B is the amplitude of variation Δ λ of air ratio separately.The something in common in these two cycles is that the oxygen storage both was not full of fully, also is not emptied completely.This oxygen quantitative change curve of storing from the oxygen storage sees that it all is no more than the maximum oxygen memory capabilities at any time.In the oil-poor stage, the oxygen amount of being stored increases.This is in time period I.In the rich oil stage subsequently, oxygen in the oxygen storage and flammable tail gas constituent element transform.This is illustrated in time period II.By adjusting significantly, for example shown in second rich oil-oil-poor cycle B like that, have a lot of oxygen to be transformed in each rich oil Phase.Occur higher hot-fluid thus, therefore adjust higher intensification by the oxygen storage.This Fig. 3 below there is shown.When the temperature at place, oxygen memory enter kept invariable, the outlet port temperature changed and changes according to air ratio that is adjusted or air ratio, shown in the top figure of Fig. 3.Utilize this relation, can control or adjust the temperature of oxygen storage, and then for example be the temperature of catalyst converter.
Fig. 4 schematically illustrates in conjunction with the oxygen storage and utilizes work plan to realize a temperature controlled feasible program.This work plan regulation internal-combustion engine 2, it provides time dependent air ratio lambda as actual state.The actual state value of this air ratio enters oxygen storage 8 on the one hand, has grasped temperature T by corresponding temperature transducer thus.Can grasp the temperature of oxygen storage 8 and/or here, in the oxygen storage 8 tail gas stream temperature in the outlet port of catalyst converter, particle trap or other tail gas secondary treatment constituent elements for example.This temperature value is as the control parameter.It allows temperature value of regulation, and this temperature value provides the expected value of waiting to regulate temperature of oxygen storage or tail gas secondary treatment constituent element.Expected value is for example by engine control system or also stipulate by independent controller.According to the comparison of control parameter and expected value, determine control deviation, control deviation is flowed to controller 15 as the input parameter.Controller 15 produces the air ratio amplitude thus, is preferably the air ratio variable format.As by the pulsewidth modulation generator, can from air ratio changes delta λ, obtain air ratio expected value λ by corresponding generator SollThis means that corresponding rich oil-oil-poor cycle provides the air ratio expected value, itself and air ratio actual value λ IstImport the λ controller 16 of internal-combustion engine 2 together.
Substitute mode as the required for this reason thermometric closed loop thermal control of the utilization shown in Fig. 4 signal also can adopt simple control system, and air ratio wherein changes in characterisitic family or characteristic curve.
Fig. 5 schematically illustrates the 3rd device of tail-gas secondary treatment 22 for example, and it comprises internal-combustion engine 2 and control/regulation unit 16, and control signal 17 and sensor signal 18 can be in exchanges between the two.For example before being the oxygen storage 8 of catalyst converter form, be provided with wide band lambda probe 23.Look up from stream, control probe 24 is arranged in oxygen storage 8 back.Control probe 24 can be wide band lambda probe 23 or transition probe.By wide band lambda probe 23, air ratio in the tail gas stream or oxygen amount are sent to control/regulation unit 16 in conjunction with characterization parameter.The signal value of air ratio or sign oxygen also is sent to control/regulation unit 16 from control probe 24.This signal also can be based on the jump signal of used probe this moment.By this design proposal, on the one hand can be according to the oxygen amount of determining by the balance of oxygen storage 8 in oxygen storage 8 stored.On the other hand, this structure is suitable for avoiding by oxygen storage 8 and and then the rich oil burst that causes of the catalyst converter that is attached thereto and the especially H2S discharging when the desulfurization that causes thus.
Fig. 6 schematically illustrates the tradition control of catalyst converter, and it has utilized the λ probe that is arranged in outlet.Above Fig. 6, also show air ratio in the view, the oxygen amount of storing in the catalyst converter has been shown in the view below Fig. 6.These values illustrate according to the time respectively.If greater than 1, determine that then generation is from the oil-poor switching point that runs to the transition of rich oil operation according to the air ratio behind the definite catalyst converter of λ probe.And if determine that according to λ probe air ratio behind the catalyst converter less than 1, then is transformed into oil-poor operation from the rich oil operation.From the figure of below, each switching point is shown in dotted line to move down from upside figure.Preferably set like this and obtain not enough stoichiometry or superstoichiometric air ratio, that is, the oxygen amount of storage is taken out from the oxygen storage fully at that time in the oxygen storage, perhaps will be above the storage capacity of oxygen storage.From the side elevation view of Fig. 6, represented catalyst converter air ratio expected value before with solid line c.Point picture a represents the air ratio actual value before the catalyst converter, and the air ratio b behind the related expression catalyst converter of dotted line.Obtain the following relation about rich oil-oil-poor cycle thus, which will be controlled in conjunction with the λ signal behind the catalyst converter: the λ before catalyst converter is greater than 1 oil-poor Phase I, catalyst converter and then oxygen storage fills.If it is uncontrolled that the oxygen in this stage is filled, then there is not oxygen to pass storage, the λ signal of noting behind the catalyst converter as the oxygen storage equals 1 all the time.When aerobic storage is thoroughly filled up, just can be by burst of λ signal discovery oxygen and the transition of beginning rich oil.In the rich oil Phase, the storage emptying.If have sufficiently high temperature this moment, then nearly all reduzate all will be converted, thereby the λ signal keeps 1 again.But after being emptied completely the oxygen storage, the reduzate burst takes place, it is illustrated by probe.Have only when finding this situation, could realize oil-poor transition by the λ probe.Because at control route and the inertia in the actuator separately, at this moment in the appearance that has caused reducing substances sometime.When desulfurization, this may mean and H2S occurs.And utilize device shown in Figure 5, and just can avoid occurring this situation, especially realized multi-form adjustment.
Fig. 7 represents to control with catalyst converter shown in Figure 6 the feasible design of the oxygen storage two point control of contrast.Control rich oil-oil-poor cycle in conjunction with the oxygen amount of for example in catalyst converter, storing here.This permission can prevent rich oil burst and oil-poor burst.Preferably for example adopt sluggish type two point control system for this reason.If surpass predetermined oxygen threshold value, start the rich oil operation.If be lower than another threshold value, finish oil-poor transition.If there is abundant oxygen at any time in desulfurization, these oxygen can be used to oxidation H2S.Therefore when upper threshold value 25 that the downside of Fig. 7 illustrates and lower threshold value can differ enough greatly in the maximum oxygen absorptivity with the oxygen storage or under oxygen storage emptying state, guarantee reliable operation in any time of running of device of tail-gas secondary treatment.Find out from the top view of Fig. 7, under the situation of the oxygen amount in considering the oxygen storage and then in tail gas secondary treatment constituent element, expected value before the catalyst converter shown in the dotted line c and the air ratio actual value before the catalyst converter shown in the dot and dash line a may cause 1 the air ratio lambda of equaling behind the catalyst converter.Especially, this allows can reliable adjustment to go out λ after catalyst converter or tail gas secondary treatment constituent element and equals 1 stable air and compare b.

Claims (32)

1, the operation method of a kind of vehicle exhaust secondary treatment equipment (1), wherein oxygen is supplied to the oxygen storage (8) of tail gas secondary treatment constituent element (7) and is removed, wherein, determine the parameter that at least one changes self, described parameter is to determine by described oxygen storage and by the oxygen amount of described oxygen storage, and described parameter is used in the operation method of described vehicle exhaust secondary treatment equipment (1).
2, method according to claim 1 is characterized in that, determines the oxygen amount in described oxygen storage.
3, method according to claim 1 and 2 is characterized in that, the oxygen amount in the described oxygen storage (8) adds in the adjustment in rich oil-oil-poor cycle as parameter.
According to the described method of one of claim 1 to 3, it is characterized in that 4, the cyclically-varying of the oxygen amount of being stored is used to adjust with limiting mode the temperature of tail gas or described oxygen storage.
5, according to the described method of one of aforementioned claim, it is characterized in that, with determined oxygen amount relatively with the described vehicle exhaust secondary treatment of oxygen additional input equipment (1).
According to the described method of one of aforementioned claim, it is characterized in that 6, the oxygen amount is calculated in oxygen balance on every side by described oxygen storage (8).
7, method according to claim 6 is characterized in that, the first probe described oxygen storage of (6) continuous measurement (8) the oxygen amount before, and second probe (11) especially the transition probe determine that tail gas is rich oil or oil-poor.
8, according to the described method of one of aforementioned claim, it is characterized in that, when particulate filter and/or nitrogen oxides storage catalyst converter are regenerated, determined oxygen amount is added as parameter.
9, according to the described method of one of aforementioned claim, it is characterized in that, in the sweetening process of oxide storage especially nitrogen oxides storage device, determined oxygen amount is added as parameter.
10, according to Claim 8 or 9 described methods, it is characterized in that,, determined oxygen amount is added as parameter in order to determine the initial moment of desulfurization and/or regeneration.
11, according to Claim 8,9 or 10 described methods, it is characterized in that, in order to determine the endurance of desulfurization and/or regeneration, determined oxygen amount is added as parameter.
12, according to the described method of one of aforementioned claim, it is characterized in that, described oxygen property memory cycle ground is used for intensification before the diesel particulate filter (DPF) regeneration.
13, according to the described method of one of aforementioned claim, it is characterized in that, set at least one threshold value (25,26) relevant with the oxygen amount of determined storage, when surpassing this threshold value, the cycle that starts between the operation of oil-poor operation and rich oil switches.
14, according to the described method of one of aforementioned claim, it is characterized in that, determine upper threshold value (25) and the lower threshold value (26) relevant with the oxygen amount, when surpassing threshold value, the cycle that starts between the operation of oil-poor operation and rich oil switches.
15, according to the described method of one of aforementioned claim, it is characterized in that, internal-combustion engine is according to rich oil-oil-poor periodic duty, and wherein determining the temperature of described oxygen storage (8) and changing according to determined temperature influences the Operational Limits that oxygen storage speed and/or oxygen are surrendered speed.
According to the described method of one of aforementioned claim, it is characterized in that 16, internal-combustion engine is wherein determined the temperature of described oxygen storage (8) and the Operational Limits of the oxygen amount that the determined temperature change influence of foundation is stored according to rich oil one oil-poor periodic duty.
17, according to the described method of one of aforementioned claim, it is characterized in that, temperature control or temperature adjustment about described tail gas secondary treatment constituent element (7) with oxygen storage (8), change the oxygen amount of surrendering or absorbing by described oxygen storage (8) in the unit time, to adapt to the temperature of described tail gas secondary treatment constituent element (7).
18, according to the described method of one of aforementioned claim, it is characterized in that, in the sweetening process of oxide accumulator-type catalytic converter, move rich oil-oil-poor cycle at least in part, note the air ratio of oxide accumulator-type catalytic converter front and back, determine the oxygen amount and use described oxygen storage (8) at this, avoid behind the oxide accumulator-type catalytic converter, occurring the hyperstoichiometry and/or the not enough stoichiometry of air ratio.
19, a kind of device of tail-gas secondary treatment (1), described device of tail-gas secondary treatment comprises the internal-combustion engine (2) that joins with it, wherein said internal-combustion engine (2) has engine control system (12), and described device of tail-gas secondary treatment (1) has at least one in check catalyst converter and oxygen storage (8), be provided with first probe (6) before and be provided with second probe (11) afterwards at described oxygen storage (8) at described oxygen storage (8), wherein, at least described first probe (6) determines to characterize first parameter of oxygen amount, the parameter of being noted by described first probe (6) and described second probe (11) is delivered to analysis and processing unit (14) with signal form, described analysis and processing unit (14) is connected with the engine control system (12) that comprises adjustment or control unit, and described adjustment or control unit are considered rich oil-oil-poor cycle according to determined parameter.
20, tail gas treatment device according to claim 19 is characterized in that, described second probe (11) is a temp probe, and the parameter of described temp probe is incorporated in the control of the λ value of described engine control system (12) or adjusting.
21, tail gas treatment device according to claim 20 is characterized in that, rich oil-oil-poor cycle is incorporated in the λ value adjustment of described internal-combustion engine (2) as expected value.
22, according to claim 19,20 or 21 described device of tail-gas secondary treatment (1), it is characterized in that, described first probe (6) and described second probe (11) determine to characterize first parameter of oxygen amount respectively, described first parameter of described first probe (6) and described second probe (11) is admitted to described analysis and processing unit (14) with signal form, described analysis and processing unit (14) is determined second parameter of the oxygen amount of the described oxygen storage of sign (8) from described first parameter, and described engine control system (12) is connected with the device of the air ratio that is used for adjusting described device of tail-gas secondary treatment (1), wherein adjusts air ratio by described device and according to described second parameter.
According to the described device of tail-gas secondary treatment of one of aforementioned claim (1), it is characterized in that 23, described first probe (6) is the wide band lambda probe, described second probe (11) is the transition probe.
24, according to the described device of tail-gas secondary treatment of one of aforementioned claim (1), it is characterized in that, described oxygen storage (8) has first portion (9) and second portion (10), and they are arranged in one or two the different tail gas secondary treatment constituent elements (7) at least.
According to the described device of tail-gas secondary treatment of one of aforementioned claim (1), it is characterized in that 25, described oxygen storage (8) is the constituent element of nitrogen oxide catalyst converter.
According to the described device of tail-gas secondary treatment of one of aforementioned claim (1), it is characterized in that 26, described oxygen storage (8) is the constituent element of particulate filter.
27, according to the described device of tail-gas secondary treatment of one of aforementioned claim (1), it is characterized in that, be provided with the measure probe of the temperature that is used for definite described oxygen storage (8).
28, according to the described device of tail-gas secondary treatment of one of claim 22 to 27 (1), it is characterized in that, add described second parameter control of at least a foundation, be used to start the switching between rich oil operation and the oil-poor operation.
29, device of tail-gas secondary treatment according to claim 28 (1) is characterized in that, adds the adjustment of described second parameter of a kind of foundation.
30, a kind of engine control system (12) is preferably used in according to the described device of tail-gas secondary treatment of one of aforementioned claim, and described engine control system (12) has the controller of controlling rich oil-oil-poor cycle by the oxygen content of adjusting the oxygen storage.
31, according to the application of the described method of one of aforementioned claim in described device of tail-gas secondary treatment, so that avoid the burst of H2S tail gas by described device of tail-gas secondary treatment according to one of aforementioned claim.
32, according to the application of the described method of one of aforementioned claim in described device of tail-gas secondary treatment, to avoid oxygen storage (8) overheated according to one of aforementioned claim.
CN2007800194433A 2006-05-27 2007-05-25 Operation method and device of tail-gas secondary treatment device Expired - Fee Related CN101454547B (en)

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