CN101994558A - Method of controlling fuel in an exhaust treatment system implementing temporary engine control - Google Patents

Method of controlling fuel in an exhaust treatment system implementing temporary engine control Download PDF

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Publication number
CN101994558A
CN101994558A CN2010102601885A CN201010260188A CN101994558A CN 101994558 A CN101994558 A CN 101994558A CN 2010102601885 A CN2010102601885 A CN 2010102601885A CN 201010260188 A CN201010260188 A CN 201010260188A CN 101994558 A CN101994558 A CN 101994558A
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CN
China
Prior art keywords
power source
valve
exhaust
filter
blast air
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2010102601885A
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Chinese (zh)
Inventor
D·卡帕洛斯
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Caterpillar Inc
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Caterpillar Inc
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Publication date
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Publication of CN101994558A publication Critical patent/CN101994558A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
    • F02B37/183—Arrangements of bypass valves or actuators therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/029—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 by adding non-fuel substances to exhaust
    • 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
    • F01N3/031—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 having means for by-passing filters, e.g. when clogged or during cold engine start
    • F01N3/032—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 having means for by-passing filters, e.g. when clogged or during cold engine start during filter regeneration only
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying 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
    • F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
    • F01N2410/04—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device during regeneration period, e.g. of particle filter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
    • F01N3/0256—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases the fuel being ignited by electrical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/013—Engines characterised by provision of pumps driven at least for part of the time by exhaust with exhaust-driven pumps arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/16—Control of the pumps by bypassing charging air
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

The invention relates to a method of controlling fuel in an exhaust treatment system implementing temporary engine control. An exhaust treatment system associated with a power source is disclosed. The exhaust treatment system may have a filter located to remove particulate matter from a flow of exhaust, and a regeneration device located proximal the filter. The exhaust treatment system may also have a first fluid handling component located upstream of the power source to vary an amount of oxygen in the flow of exhaust, a second fluid handling component located downstream of the power source to vary the amount of exhaust air flow in the exhaust circuit, and a controller in communication with the regeneration device and the fluid handling component. The controller may determine a need for filter regeneration, and determine adjustments to the first and second fluid handling components required to provide sufficient oxygen and air mass flow in the exhaust for filter regeneration. The controller may further determine an effect the adjustments will have on operation of the power source, and determine corrections for the power source to account for the effects. The controller may substantially simultaneously implement the adjustments and the corrections.

Description

Fuel controlling method in the exhaust-gas treatment system of implementing interim engine control
Technical field
Present invention relates in general to a kind of exhaust-gas treatment system, relate more specifically to a kind of fuel controlling method in the exhaust-gas treatment system of implementing interim engine control.
Background technique
The complex mixture of motor meeting exhausting air pollutant, described motor comprises diesel engine, petrol engine, natural gas engine and other motor known in the art.Air pollutant can be made up of gas and solid material, and described air pollutant comprise nitrogen oxide (NOx) and particulate matter.Because the concern of environment is increased, and it is harsher that waste gas emission standard becomes, and can be according to the grade of the size of the type of motor, motor and/or motor to carrying out control from the NOx of engine emission and the amount of particulate matter.
In order to meet being discharged into the regulation of the NOx in the environment, a kind of method that the motor manufacturer has implemented is to make from the exhaust gas recirculatioon of motor discharge to get back in the motor to be used for burning subsequently.The exhaust of recirculation reduced the oxygen concentration in the air inlet that is supplied to motor, this so that reduced maximum combustion temperature in the cylinder.Decrease of temperature makes with the relevant chemical process of burning and slows down, thereby has reduced the formation of NOx.
The employed method that is used for reducing the amount that is discharged into the particulate matter in the environment of motor manufacturer comprises with a kind of equipment that is called as particulate filter removes particulate matter in the blast air of motor.Particulate filter is designed to trap particulate matter, and is made up of wire gaze or ceramic honeycomb filter medium usually.Although effective when removing particulate matter from blast air, the long-time use of particulate filter can cause particulate matter to assemble in filter medium, thereby has reduced the function of filter and and then reduced engine performance.Can from filter medium, remove collected particulate matter by the process that is called as regeneration.For the regeneration that makes filter medium begins, must make the temperature of the particulate matter of carrying secretly in the filter medium be elevated to combustion threshold, when reaching this combustion threshold, particulate matter is burnt under the condition that oxygen exists.
Although the use of the recirculation of exhaust and particulate filter can make NOx and particulate matter minimize to the discharging of atmosphere, these two kinds of methods all can influence the oxygen amount that enters and leave motor or the oxygen amount that is entered and leave motor influences.Particularly, exhaust gas recirculatioon (EGR) enters motor by reduction and the oxygen amount that can be used for burning is come work.The regeneration of particulate filter needs oxygen to help burn the particulate matter that is captured.Therefore, when EGR moved, because the amount of oxygen that can be used for regenerating reduces because of the use of EGR, it is effective that the regeneration of particulate filter only can minimally.For this reason, in some applications, these two kinds of exhaust gas treatment methods can be separate (exclusive), the additional or special-purpose source of oxygen of the purpose that perhaps needs to be used to regenerate.
At disclosed U.S. Patent Publication text No.2002/50150218 (' 218 open texts on July 14th, 2005 by people such as Crawley application) in described and in same engine system, used the two a kind of trial of EGR and granule capturing/regeneration.Particularly, ' 218 open textual descriptions a kind ofly have a motor that assembly is subdued in exhaust gas recycling system and discharging.The burner that assembly comprises combustion fuel is subdued in this discharging, and this burner is positioned at the upstream of particulate filter, so that particulate filter regeneration.At the run duration of motor, blast air is crossed particulate filter, thereby captures cigarette ash (being particulate matter) in filter.By outlet pipe treated exhaust is discharged into the atmosphere then.At the run duration of motor, control unit every now and then, is optionally handled the burner of combustion fuel, so that particulate filter regeneration.In a kind of configuration, discharging is subdued assembly and is not used additional air.According to like this, match with the regeneration of particulate filter in the position of EGR valve.That is to say, in order to improve the oxygen content in temperature and the exhaust, about 10 minutes time of EGR valve temporary close of motor.During this period of time, activate the burner of combustion fuel, thereby also make particulate filter regeneration, this burner provide the oxygen of the abundance in fuel stream and the exhaust with the heated particle filter.
Although the motor of the open text in ' 218 can utilize egr system and particulate filter and benefit from these two, the motor that is associated may be inconsistent and/or be not best in the operation of regeneration period.That is to say, owing to utilize EGR to reduce the NOx discharging, so by close EGR (promptly by closing the EGR valve) during granules regeneration, motor can discharge too much NOx in that time.In addition, owing to when the EGR valve cuts out, entering and changing by the air of engine combustion and the relative quantity of fuel, so at regeneration period, the regeneration meeting of particulate filter produces negative and/or beyond thought influence to the others (being power output, fuel consumption etc.) of engine performance.In addition, at regeneration period,, therefore can consume a large amount of fuel because the burner of combustion fuel heats all exhausts from power source (power source).
Exhaust-gas treatment system disclosed by the invention is intended to overcome one or more problem above-mentioned.
Summary of the invention
On the one hand, the present invention relates to a kind of exhaust-gas treatment system that is associated with power source.This exhaust-gas treatment system can comprise filter, and this filter is positioned at the downstream of power source, to remove by the particulate matter in the blast air that power source was produced.This exhaust-gas treatment system also can comprise reclaim equiment, and this reclaim equiment is positioned to neighbor filter, is higher than the igniting threshold value so that the temperature of removed particulate matter is elevated to.This exhaust-gas treatment system also can comprise the first fluid manipulation/controlling component and the second fluid actuated parts, described first fluid control member is positioned at the upstream of power source, to change the oxygen amount in the blast air, the described second fluid actuated positioning parts is walked around the extraction flow of reclaim equiment in the downstream of power source and the upstream of reclaim equiment with change.This exhaust-gas treatment system also can comprise controller, and this controller is communicated by letter with power source, filter, reclaim equiment, first fluid control member and the second fluid actuated parts.This controller can be configured to definite needs to filter regeneration.Controller also can be configured to determine first of first fluid control member is regulated, to be provided for the enough oxygen of filter regeneration in blast air.In addition, controller also can be configured to determine second of the second fluid actuated parts are regulated, so that enough mass flow rates of the exhaust of walking around reclaim equiment to be provided.Controller also can promote the regeneration of filter.
On the other hand, the present invention relates to a kind of method that is used to make filter regeneration, this filter is removed by the particulate matter in the blast air that power source produced.This method can comprise that combustion fuel and AIR MIXTURES are to produce the step of power and blast air.This method is used the particulate matter in filter removal and the collection blast air.Can determine to make the needs of filter regeneration.In addition, can determine that reclaim equiment is regulated the required oxygen amount of filter regeneration.Can determine to walk around the adjusting of the extraction flow of reclaim equiment.Can make filter regeneration then.
Again on the one hand, the present invention relates to a kind of engine system, this engine system has and is configured to combustion fuel and AIR MIXTURES to produce the motor of power and blast air.This engine system also can have inflation (charging into air) and import pipeline (circuit), and this inflation imports pipeline and is configured to pressurized air is introduced in the motor.This system also can comprise gas exhaust piping, and this gas exhaust piping is configured to the air guided atmosphere that causes from motor.In addition, this system can have filter, and this filter is positioned at the downstream of motor to remove the particulate matter of blast air.This system also can comprise reclaim equiment, and this reclaim equiment is positioned near the filter place, is higher than the igniting threshold value so that the temperature of removed particulate matter is elevated to.First valve can be positioned on the upstream of motor to change the oxygen amount in the blast air.Second valve can be positioned on the downstream of motor and the upstream of reclaim equiment, walks around the extraction flow of reclaim equiment with change.This system also can comprise controller, and this controller is communicated by letter with motor, filter, reclaim equiment, first valve and second valve.This controller can be configured to definite needs to particulate filter regeneration.Controller also can be determined first of first valve is regulated, and this first valve regulation is used for the oxygen of the blast air of filter regeneration.Controller also can be determined second of second valve is regulated, and the blast air of reclaim equiment is walked around in this second valve regulation.In addition, controller also can promote the regeneration of filter.
Description of drawings
Fig. 1 is the schematic representation with power source of exemplary disclosed exhaust-gas treatment system.
Embodiment
Fig. 1 shows power source 10, and this power source 10 has exemplary exhaust-gas treatment system 12.Power source 10 can be embodied in motor, for example diesel engine, petrol engine, motor or any other conspicuous to one skilled in the art motor by gaseous fuel-driven such as natural gas engine.Perhaps, power source 10 can be embodied in the power source of non-motor, such as stove.Exhaust-gas treatment system 12 can comprise air inlet pipeline 14, gas exhaust piping 16 and recirculating line 18, and this recirculating line is connected on the power source 10, fluid is conveyed into and transfers out power source 10.
Air inlet pipeline 14 can comprise a device, and this device is used for inflation is introduced in the firing chamber (not shown) of power source 10.For example, air inlet pipeline 14 can comprise air cleaner 20 and by the suction valve 22 of fluid coupled in one or more compressors 24 upstreams.Can imagine and in air inlet pipeline 14, comprise additional and/or different parts, for example, the one or more air-cooler in compressor 24 upstreams and/or downstream, the exhaust gas by-pass valve relevant (waste gate) and other devices that are used for inflation is introduced the firing chamber of power source 10 known in the art of being positioned at the release of compressor 24.
Suction valve 22 can regulate are 24 air volume from purifier 20 to compressor.Suction valve 22 can comprise for example valve element of butterfly valve element, flapper valve element, gate valve element, ball valve element, stop valve element or any other type as known in the art.The element of suction valve 22 can be arranged in the passage 28, and can move to the current limliting position from the through-flow position of antagonistic spring bias voltage.In one example, the element of suction valve 22 can be connected on the torsion spring (not shown), and this torsion spring can be towards current limliting position this element of bias voltage.When in through-flow position, atmosphere can not introduced in the power source 10 via compressor 24 from purifier 20 basically limitedly.Can the element of suction valve 22 be moved to any position between current limliting position and the through-flow position in response to one or more inputs.
But compressor 24 tandem arrangement, and fluid is connected on the power source 10, with the air compression that will flow into power source 10 to predeterminated level.Each compressor 24 can be embodied in the compressor of fixed geometry, the compressor of geometry-variable or the compressor of any other type as known in the art.Can imagine compressor 24 and be arranged in parallel alternatively, perhaps air inlet pipeline 14 can only comprise single compressed machine 24.When the non-pressurised air inlet pipeline of expectation, also can imagine and omit compressor 24.
Gas exhaust piping 16 can comprise a device, and this device is used to handle and guide the blast air that flows out from power source 10.For example, gas exhaust piping 16 can comprise one or more being connected in series to receive from the turbine 32 of the exhaust of power source 10, the NOx adsorber 43 that is positioned at the particulate filter 42 in turbine 32 downstreams and is positioned at particulate filter 42 downstreams.Can imagine gas exhaust piping 16 and comprise additional and/or different parts, catalysis emission control equipment for example, relaxation equipment and other be known in the art to be used to handle and to guide the device of the blast air that flows out from power source 10.
Each turbine 32 can be connected on the compressor 24, to drive the compressor 24 that is connected.Particularly, when the blade (not shown) of the thermal exhaust expansion impulse turbine 32 that leaves power source 10, turbine 32 is rotatable and drive the compressor 24 that is connected.Can imagine turbo machine 32 and be arranged in parallel alternatively, perhaps in gas exhaust piping 16, only comprise single turbine 32.If necessary, also can imagine and omit turbine 32, and compressor 24 can by power source 10 mechanically, hydraulically, electrically or with any alternate manner driving known in the art.
Particulate filter 42 can be arranged in the downstream of turbine 32, to remove particulate matter from the blast air of power source 10.Particulate filter 42 be can imagine and wide-meshed screen metal conduction or nonconducting or ceramic component comprised.Also can imagine catalyzer (not shown) that particulate filter 42 comprises the firing temperature that is used to reduce the particulate matter that is captured by particulate filter 42, be used to make the device 45 of the particulate regeneration that particulate filter 42 captured or catalyzer and the device that is used to regenerate the two.Described catalyzer can be supported the reduction of HC, CO and/or particulate matter, and can comprise for example alkali metal/base metal oxide, fuse salt and/or precious metal.In addition, the device 45 that is used to regenerate can comprise burner 47, resistance heater, engine control strategy or any device that is used to regenerate that other is fit to of combustion fuel.If desired, also can imagine particulate filter 42 is repositioned at other position in the recirculating line 18.
NOx adsorber 43 can comprise and one or morely is coated with or otherwise contains liquid state or gaseous catalyst (for example contains the substrate of the mesosphere/interlayer (wash coat, washcoat)) of precious metal.This catalyzer can capture the combustion by-product that reduces in the blast air by means of selective catalytic reduction (SCR) or NOx.In one example, the reagent such as urea can be ejected in NOx adsorber 43 exhaust gas stream upstream.Urea can decompose ammonification, and the NOx reaction in ammonia and the exhaust is to form H 2O and N 2In another example, the NOx in the exhaust can capture by containing barium salt equipment, and periodically discharges and pass catalyst reduction to form CO 2And N 2If desired, NOx adsorber 43 also can be used to oxidation by still being retained in the particulate matter in the blast air after the particulate filter 42.
First bypass line 34 can be associated with air inlet pipeline 14 and gas exhaust piping 16, walks around power source 10 from the inflation of compressor 24 and leads to the device 45 that is used to make particulate filter 42 regeneration optionally to make.Bypass valve 36 can be positioned in the pipeline 34, and comprises the valve element of other type of butterfly valve element for example, flapper valve element, gate valve element, ball valve element, stop valve element or any removable flow of aerating air that passes bypass line 34 with adjusting known in the art.
Recirculating line 18 can comprise a device, and this device is used for the blast air of a part of power source 10 is introduced in the air inlet pipeline 14 from gas exhaust piping 16 again.For example, recirculating line 18 can comprise suction port 40, recycle valve 46 and floss hole 48.Can imagine recirculating line 18 and comprise additional and/or different parts, agranular exhaust basically be introduced device in the air inlet pipeline 14 again from gas exhaust piping 16 such as vent gas cooler, catalyzer, electrostatic precipitation equipment, shielding gas system and other known in the art being used for.When a part of exhaust via suction port 40 when gas exhaust piping 16 enters recirculating line 18, can exhaust be restricted to the flow of expectation by recycle valve 46, and air inlet pipeline 14 be introduced in exhaust via floss hole 48.Suction port 40 can be connected on the gas exhaust piping 16, to receive the blast air of at least a portion from power source 10.Particularly, suction port 40 can be arranged in the downstream of turbine 32, to receive the low pressure exhaust from turbine 32.
Second bypass line 76 can be associated with recirculating line 18, optionally to make the exhaust bypass exhaust pipe road 16 of at least a portion from power source 10, arrives the downstream of particulate filter 42, and enters the suction port 40 of circulation loop 18.Bypass valve 78 can be positioned in the bypass line 76, and comprising for example two-way valve or three-way valve, described two-way valve or three-way valve comprise the valve element of butterfly valve element, flapper valve element, gate valve element, ball valve element, stop valve element or any other type known in the art.This bypass valve can be close to power source 10 and in its downstream location.In addition, bypass valve 76 can be positioned on burner 47 upstreams of combustion fuel.
Recycle valve 46 can be connected to suction port 40 via fluid passage 52 fluids, and is connected to floss hole 48 via fluid passage 54.By this way, recycle valve 46 can be arranged to optionally make blast air to flow into air inlet pipeline 14 or limit blast air from gas exhaust piping 16 and flow into air inlet pipelines 14 from gas exhaust piping 16.
But floss hole 48 fluids are connected to recycle valve 46, introducing air inlet pipeline 14 by the blast air that recycle valve 46 is regulated.Particularly, floss hole 48 can be connected on the air inlet pipeline 14 of compressor 24 upstreams, makes compressor 24 to flow from floss hole 48 exhaust gas extractions.In an optional high pressure gas recirculating line, if desired, can imagine floss hole 48 is positioned at compressor 24 downstreams.
Control system 62 can comprise some parts, and these parts interact to determine and to control the roadability of air inlet pipeline, gas exhaust piping and recirculating line 14,16 and 18.Especially, control system 62 can comprise controller 66, this controller respectively via communication line 68,70,72,74 with 80 with suction valve 22, bypass valve 36, recycle valve 46, be used to make device 45, power source 10, the bypass valve 78 of particulate filter 42 regeneration to communicate by letter.If desired, can imagine in control system 62 and also can comprise additional sensor, the sensor of engine speed sensor, delivery temperature or lambda sensor, suction pressure or temperature transducer, fuel flow rate or pressure transducer, NOx sensor or any other type known in the art for example, and described additional sensor is communicated by letter with controller 66.
Controller 66 can be embodied in single microprocessor or a plurality of microprocessor, and described microprocessor comprises and is used to control air inlet pipeline, gas exhaust piping and recirculating line 14,16 and 18 and the device of the operation of power source 10.Many commercially available microprocessors all can be configured to the function of implementation controller 66.Should be appreciated that controller 66 can easily be embodied in the comprehensive dynamic source microprocessor that can control many duties of engine.Controller 66 can comprise storage, secondary storage facilities, processor and other parts that are used to run application.Various other circuit such as power circuit, circuit for signal conditioning, solenoid driver circuitry and other type circuit can be associated with controller 66.
Can store one or more arteries and veins spectrograms (map) in the storage of controller 66, described arteries and veins spectrogram relates to oxygen concentration, boost pressure, intake temperature, charge flow rate, engine fuel injection amount, injection timing, jet pressure, engine power output, extraction flow, exhaust emissions level and/or the required setting or the configuration of the first and second fluid actuated parts of exhaust.In these arteries and veins spectrograms each all can be the data acquisition system with form, curve and/or equation form.
Controller 66 can receive expression needs the input of particulate filter regeneration, and with reference to above-mentioned arteries and veins spectrogram with the oxygen that is defined as in blast air, providing enough to promote the needed adjusting that first fluid control member (being suction valve 22, compressor 24, bypass valve 36 and recycle valve 46 etc.) is carried out of regenerative process.That is to say,, must have enough oxygen supplies, so that the fuel that is sprayed by burner 47 suitably burns in order to obtain to be used to make the proper temperature of particulate filter 42 regeneration.Controller 66 also can be with reference to described arteries and veins spectrogram with the extraction flow that is defined as providing minimum to promote the needed adjusting that the second fluid actuated parts (that is, bypass valve 78, recycle valve 46 etc.) are carried out of regenerative process.
Therefore, need in response to indicated regeneration, controller 66 can be with reference to the arteries and veins spectrogram with the aperture amount of the increase of determining suction valve 22 (promptly, restriction to the minimizing of suction valve 22)---it allows more oxygen to enter and pass power source 10 and arrives burners 47, the change of compressor characteristics---its increase enters and passes the pressure and/or the flow of the air of power source 10, the aperture of the increase of bypass valve 36---it amplifies the air quantity of the exhaust in direct steering power source 10 downstreams, and/or the aperture that reduces of recycle valve 46 restriction of the increase of the exhaust that is recycled to air inlet pipeline 14 (that is, to) thereby---the oxygen concentration that enters and leave power source 10 increases.In addition, need in response to indicated regeneration, controller 66 can be with reference to the restriction of arteries and veins spectrogram to determine to increase in the bypass valve 78---it reduces the extraction flow (promptly increasing the extraction flow in the bypass line 76) in gas exhaust piping 16, and/or the aperture of the increase of recycle valve 46 restriction of the minimizing of the exhaust that is recycled to air inlet pipeline 14 (promptly to) thereby---the MAF that is transported to burner 47 reduces.To the needs of regeneration can based on the pressure of exhaust of the time of having pass by, or prediction measured or temperature in particulate filter 42 upstreams, across particulate filter 42 measured the or pressure reduction of prediction, cigarette ash load (soot loading) amount or other similar parameter of being calculated.It is contemplated that controller 66 can solve the contradiction between the above-mentioned arteries and veins spectrogram,, make particulate filter 42 regeneration with the mode that reduces energy and fuel cost so that realize to optimize oxygen and extraction flow.
Controller 66 also can be configured to determine the correction to the operation of power source 10, considers the adjusting that the convection cell control member carries out, and described correction is essential.Particularly, when the aperture amount of regulating suction valve 22, the characteristic that changes compressor 24 entered the aperture of the pressure of air of power source 10 and/or flow, increase bypass valve 36 and/or reduce the aperture of recycle valve 46 with increase, the air fuel ratio of power source 10 can change significantly.For example, when suction valve 22 is opened to more, the configuration of compressor 24 or performance are changed when increasing boost pressure and/or charge flow rate or recycle valve 46 and be closed greater amount, the air fuel ratio of power source 10 can increase.On the contrary, when bypass valve 36 was opened to greater amount, the air fuel ratio of power source 10 can reduce.After this manner, can influence power output, operating temperature, exhaust emissions level, fuel consumption and other performance factor of power source 10.Accept for the output of the power that continues to provide required, the operation of guaranteeing power source 10 remain in the design objective, the discharging of power source 10 keeps meeting government regulation and power source 10 overall performance keeps can be its operator, the characteristic of power source 10 during regenerative process may need some corrections.These characteristics can be particularly including fuel characteristic (quantity of emitted dose, pressure, spray and/or distribution, injection timing etc.) and air inlet characteristic (boost pressure, engine valve timing etc.).Which kind of controller 66 to need can be determined proofread and correct with the conformity that keeps the power source operation in (during the time period of the roadability of promptly regulating gas exhaust piping 16 and recirculating line 18 when adapting to the regeneration of particulate filter 42) during the regenerative process or even improve the operation of power source.
Controller 66 can implement the required adjusting of particulate filter regeneration basically simultaneously and the power source operation is proofreaied and correct.That is to say,, then can implement described adjusting and correction, make the performance of power source 10 during regenerative process, remain essentially in the performance range of expectation or enter the performance range of expectation in case controller 66 has been determined required adjusting and required correction.For situation of the present invention, the preset time section can be represented in term " basically simultaneously ", carry out a plurality of actions by controller 66 during described preset time section, for example (or still less enforcement is regulated and timing under) the situation differing several seconds each other when controller 66.
Industrial usability
Disclosed exhaust-gas treatment system can be applicable to any burning type equipment, for example other fuel-burning equipment of motor, stove or any known in the art, performance that the particulate filter regeneration process can influence this burning type equipment.Change by the air fuel ratio of equipment during the prediction regenerative process, determine that the roadability of calibration equipment is adapting to this influence to the influence of equipment and during regenerative process in described change, disclosed processing system can keep the conformity of burning type equipment performance or even improve the performance of this burning type equipment during regenerative process.Operation to exhaust-gas treatment system 12 now describes.
Atmosphere can be inhaled in the air inlet pipeline 14 via suction valve 22, and is guided and passes compressor 24, can be pressurized to predeterminated level before the firing chamber that enters power source 10 at this compressor place atmosphere.Fuel can mix with forced air before or after the firing chamber that enters power source 10, was burnt by power source 10 then, to produce mechanical work and the blast air that contains gaseous compound and solid particulate matter.This blast air can be led to turbine 32 from power source 10, and in this turbine, the expansion of the exhaust of heat can make turbine 32 rotations, thereby makes compressor 24 rotations that connected, with compress inlet air.After leaving turbine 32 and flowing through particulate filter 42, blast air can be divided into two strands of agranular basically air-flows, comprising first air-flow that is directed to air inlet pipeline 14 again and second air-flow that is led to atmosphere.
The blast air that is guided through the particle minimizing of suction port 40 can be withdrawn in the air inlet pipeline 14 via recycle valve 46 by compressor 24.The restriction of being controlled by recycle valve 46 to exhaust can influence the air displacement that is drawn into power source 10 by compressor 24 by air inlet pipeline 14.
Then, the blast air of recirculation can with the air mixing that enters the firing chamber.The exhaust that is led to the firing chamber of power source 10 can reduce the oxygen concentration in the firing chamber, and and then has reduced maximum combustion temperature in the power source 10.The reduction of maximum combustion temperature can make the chemical reaction of combustion process slow down, thereby has reduced the formation of nitrogen oxide.By this way, can reduce the gaseous contamination that power source 10 is produced, and bad without undergoing the adverse effect and the performance that are produced by the excess particles thing that is introduced into power source 10.When second blast air passed through suction port 40, this second blast air can be guided and pass catalyzer, to remove NOx and other pollutant in the exhaust.
After operation a period of time, particulate matter can obviously be assembled in particulate filter 42 and need make particulate filter regeneration at power source.In order to make particulate filter 42 regeneration, the burner 47 of combustion fuel can inject a certain amount of fuel in the blast air of power source 10 of particulate filter 42 upstreams.Must there be enough oxygen concentrations in holomorphosis in order to ensure the active combustion and the particulate filter 42 of the fuel that is sprayed in the blast air.The available supply of dual mode at least oxygen comprises via bypass line 34 and directly supplying from compressor 24, or supplies from compressor 24 indirectly via power source 10.
In order directly to increase from the oxygen concentration in the exhaust of power source 10, removable bypass valve 36 is to reduce the restriction to the aerated flow that passes bypass line 34.The air quantity of passing pipeline 34 can be enough to make particulate filter 42 regeneration, and is regulated by controller 66 as mentioned above.Yet, if do not consider/do not take into account adjusting, pass pipeline 34 by allowing relatively large air to bypass valve 36, less air can be used for the burning (being that air fuel ratio can reduce) in the power source 10.Lower air fuel ratio can increase the delivery temperature and the discharging of power source 10, and reduces its power output and fuel efficiency simultaneously.
For the adjusting that makes bypass valve 36 to power source 10 performances the influence that may have minimize, can proofread and correct the various roadabilitys of power source 10.For example, can increase the boost pressure and/or the air mass flow of power source 10 ingress.This increase can be by during regenerative process, proofreading and correct compressor 24 operation, proofread and correct exhaust gas by-pass valve (wastegate) and set and/or proofread and correct engine valve and set (be that motor opens, cuts out, lifting height and/or promote the endurance) and finish.Interrupt minimizing for the performance that makes power source 10, can implement simultaneously basically to the adjusting of bypass valve 36 with to the correction of power source 10.
In order to increase indirectly from the oxygen concentration in the exhaust of power source 10, removable recycle valve 46 is to increase the restriction to the blast air that flows into power source 10.By increasing restriction to exhaust, more substantial fresh air promotion/suction can be entered power source 10, make that the oxygen concentration in the exhaust of leaving power source 10 can be enough to make particulate filter 42 regeneration.As mentioned above, moving of exhaust-gas-recirculation valve 46 can be regulated by controller 66.Yet, if do not consider adjusting, pass the air displacement of power source 10 recirculation by minimizing to recycle valve 46, can increase the generation of NOx.The increase that NOx generates can make power source 10 not meet government regulation.
For the adjusting that makes recycle valve 46 to the performance of power source 10 (promptly to NOx generation) the influence that may have minimize, can proofread and correct the various roadabilitys of power source 10.For example, can regulate is ejected into the distribution of fuel quantity, injection timing and/or injection in the power source 10, so that the generation of NOx minimizes during the regenerative process.Can regulate these variations of implementing the fuel spray distribution by the controller of power source fuel system.Interrupt minimizing for the performance that makes power source 10, can implement simultaneously basically to the adjusting of recycle valve 46 with to the correction of power source 10.Similarly regulate and proofread and correct to unite with other fluid actuated parts and carry out.
Regenerate the necessary oxygen amount except adjusting, during regenerative process, controller 66 also can be optimized the exhaust mass flow that is delivered to reclaimer 45 from power source 10, and this reclaimer 45 is depicted as burner 47.During regenerative process, controller 66 can directly reduce the exhaust mass flow that is directed to burner 47.Removable bypass valve 78 is to increase the restriction to the blast air that offers burner 47.By doing like this, burner is walked around at least a portion exhaust and particulate filter turns to.This part exhaust that bypass exhaust pipe road 16 turns to is passed bypass line 76 and is entered regenerating tube road 18.Offer the amount of the blast air of gas exhaust piping 16 by minimizing, reclaimer 45 needs the exhaust of heating less, has therefore reduced making required energy and the fuel quantity of particulate filter 42 regeneration.
Because the power source operation that disclosed exhaust-gas treatment system recoverable is relevant with the control of the fluid actuated parts that are associated is so can finish the regenerative process of particulate filter under the situation that does not influence the power source performance basically.Especially, even when adjusting that the convection cell control member is regenerated required, disclosed exhaust-gas treatment system also can be guaranteed the conformity and/or the optimal engine performance of toxic emission.In fact, can carry out simultaneously basically with the required adjusting of regenerating, interrupt (if any) so can be observed the output of power source 10 seldom because power source is proofreaied and correct.
It will be apparent to those skilled in the art that and to carry out various modifications and variations to disclosed exhaust-gas treatment system.By to the consideration of specification with to the practice of disclosed granules regeneration system, other mode of execution of the present invention to one skilled in the art will be apparent.It only is exemplary that specification and example should be considered to, and actual range is by following claim and equivalent indication thereof.

Claims (20)

1. exhaust-gas treatment system that is associated with power source comprises:
Filter, this filter is positioned at the downstream of power source, to remove the particulate matter in the blast air that this power source produced;
Reclaim equiment, this reclaim equiment is positioned near the described filter, is higher than the igniting threshold value so that removed particulate matter temperature is elevated to;
The first fluid control member, this first fluid control member is positioned at the upstream of described power source, to change the oxygen amount in the described blast air;
The second fluid actuated parts, this second fluid actuated positioning parts is walked around the extraction flow of described reclaim equiment in the downstream of described power source and the upstream of described reclaim equiment with change; With
Controller, this controller is communicated by letter with described power source, filter, reclaim equiment, first fluid control member and the second fluid actuated parts, and this controller is configured to:
Determine needs to filter regeneration;
Determine first of described first fluid control member is regulated, in blast air, to provide enough oxygen to be used for filter regeneration;
Determine second of the described second fluid actuated parts are regulated, so that enough mass flow rates of the exhaust of walking around described reclaim equiment to be provided; With
Promote the regeneration of described filter.
2. exhaust-gas treatment system as claimed in claim 1 is characterized in that, described reclaim equiment is the burner of combustion fuel.
3. exhaust-gas treatment system as claimed in claim 1 is characterized in that, described first fluid control member is a suction valve, and this suction valve is configured to regulate the air volume that flows to power source.
4. exhaust-gas treatment system as claimed in claim 3 is characterized in that, described first is adjusted to the atm number that increase is led to described power source.
5. exhaust-gas treatment system as claimed in claim 1 is characterized in that, described first fluid control member is a bypass valve, and this pass valve configuration one-tenth makes inflation walk around described power source and redirect to described blast air.
6. exhaust-gas treatment system as claimed in claim 5 is characterized in that, described first is adjusted to increase walks around the aeration quantity that described power source is led to described blast air.
7. exhaust-gas treatment system as claimed in claim 1 is characterized in that, the described second fluid actuated parts are valves, and this valve constitution becomes to make blast air walk around the inlet that described reclaim equiment is diverted to described power source.
8. exhaust-gas treatment system as claimed in claim 7 is characterized in that, described second is adjusted to increase walks around the amount that described reclaim equiment is diverted to the blast air of described power source inlet.
9. method that makes filter regeneration, described filter is removed by the particulate matter in the blast air that power source produced, and this method comprises:
Make the burning of fuel and AIR MIXTURES to produce power and blast air;
The particulate matter in the described blast air is removed and collected to the use filter;
Determine that reclaim equiment makes the needs of described filter regeneration;
Determine first of the required oxygen amount of described filter regeneration to be regulated to described reclaim equiment;
Determine second adjusting to the extraction flow of walking around described reclaim equiment; With
Make described filter regeneration.
10. method as claimed in claim 9 is characterized in that, described first is adjusted to the atm number that increase is led to described power source.
11. method as claimed in claim 9 is characterized in that, described first is adjusted to increase walks around the aeration quantity that described power source is led to described blast air.
12. method as claimed in claim 9 is characterized in that, described second is adjusted to increase walks around the amount that described reclaim equiment is diverted to the blast air of described power source inlet.
13. an engine system comprises:
Motor, this motor mechanism cause and make fuel and AIR MIXTURES burning to produce power and blast air;
Inflation imports pipeline, and this inflation imports pipeline and is configured to pressurized air is introduced in the described motor;
Gas exhaust piping, this gas exhaust piping are configured to blast air is directed to atmosphere from described motor;
Filter, this filter is positioned at the downstream of described motor, to remove the particulate matter in the described blast air;
Reclaim equiment, this reclaim equiment is positioned near the described filter, is higher than the igniting threshold value so that the temperature of removed particulate matter is elevated to;
First valve, this first valve is positioned at the upstream of described motor, to change the oxygen amount in the described blast air;
Second valve, this second valve is positioned at the downstream of described motor and the upstream of described reclaim equiment, walks around the extraction flow of described reclaim equiment with change; And
Controller, this controller is communicated by letter with described motor, filter, reclaim equiment, first valve and second valve, and this controller is configured to:
Determine needs to particulate filter regeneration;
Determine first of described first valve is regulated, this first valve regulation is used for the oxygen of the blast air of filter regeneration;
Determine second of described second valve is regulated, the extraction flow of described reclaim equiment is walked around in this second valve regulation; With
Promote the regeneration of described filter.
14. engine system as claimed in claim 13 is characterized in that, described reclaim equiment is the burner of combustion fuel.
15. engine system as claimed in claim 13 is characterized in that, described first valve is a suction valve, and this suction valve is configured to regulate the air volume that flows to described motor.
16. engine system as claimed in claim 15 is characterized in that, described first is adjusted to the atm number that increase is led to described power source.
17. engine system as claimed in claim 13 is characterized in that, described first valve is a bypass valve, and this pass valve configuration one-tenth makes inflation walk around described power source and is diverted to described blast air.
18. engine system as claimed in claim 17 is characterized in that, described first is adjusted to increase walks around the aeration quantity that described power source is led to described blast air.
19. engine system as claimed in claim 13 is characterized in that, described second valve is to be configured to make blast air to walk around the valve that described reclaim equiment is diverted to the inlet of described motor.
20. engine system as claimed in claim 19 is characterized in that, described second is adjusted to increase walks around the amount that described reclaim equiment is diverted to the blast air of described power source inlet.
CN2010102601885A 2009-08-21 2010-08-20 Method of controlling fuel in an exhaust treatment system implementing temporary engine control Pending CN101994558A (en)

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Application publication date: 20110330