CN101583781A - Exhaust emission control system of internal combustion engine - Google Patents

Exhaust emission control system of internal combustion engine Download PDF

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Publication number
CN101583781A
CN101583781A CNA2008800023862A CN200880002386A CN101583781A CN 101583781 A CN101583781 A CN 101583781A CN A2008800023862 A CNA2008800023862 A CN A2008800023862A CN 200880002386 A CN200880002386 A CN 200880002386A CN 101583781 A CN101583781 A CN 101583781A
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mentioned
exhaust gas
gas purifying
purifying device
exhaust
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森岛彰纪
井上三树男
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Toyota Motor Corp
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Toyota Motor Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9495—Controlling the catalytic process
    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • F01N3/0878—Bypassing absorbents or adsorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/208—Hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/90—Physical characteristics of catalysts
    • B01D2255/91—NOx-storage component incorporated in the catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/01—Engine exhaust gases
    • B01D2258/012—Diesel engines and lean burn gasoline engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
    • B01D53/9477—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on separate bricks, e.g. exhaust systems
    • 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
    • F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
    • F01N2410/12—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device in case of absorption, adsorption or desorption of exhaust gas constituents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • 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)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Analytical Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Biomedical Technology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

In a treatment for regenerating the purification capability of an exhaust emission control system, a technique for improving exhaust emission more positively is provided by supplying a reducing agent to the exhaust emission control system and allowing part of exhaust to bypass the exhaust emission control system. When an addition synchronous bypass control is carried out in which an reducing agent is added when an NSR is subject to NOx reduction treatment and the volume of exhaust passing through a bypass pipe out of exhaust passing an exhaust pipe is increased to thereby decrease the volume of exhaust passing through the NSR, a judgment is made (S106) as to which is larger a reduction in volume of Nox exhausted (S105) due to an increase in conversion efficiency of the NSR as the result of the addition synchronous bypass control carried out or an increase in volume of Nox exhausted (S103) due to an increase in exhaust passing through the bypass pipe. When a reduction in volume of NOx exhausted due to an increase in conversion efficiency of the NSR is judged to be larger than an increase in volume of Nox exhausted due to an increase in exhaust passing through the bypass pipe, the addition synchronous bypass control is executed (107).

Description

The emission control system of internal-combustion engine
Technical field
The present invention relates to the emission control system of internal-combustion engine.
Background technique
In the exhaust of internal-combustion engine, contain NO xDeng harmful matter.In order to reduce the discharge of these harmful matters, known have a NO that is provided with in the purifying exhaust gas in the vent systems of internal-combustion engine xNO xCatalyzer.In this technology, be provided with for example occlusion reduced form NO xUnder the situation of catalyzer, as the NO of occlusion xWhen amount increased, purifying ability descended, so, by carrying out the control of fuel overfeeding, to occlusion reduced form NO xCatalyst supply is given reducing agent, with the NO of occlusion in this catalyzer xReduction discharges (hereinafter referred to as " NO xReduction is handled ").
In addition, containing with carbon in the exhaust of internal-combustion engine is the particulate matter (PM:Particulate Matter) of main component.Discharge into the atmosphere the known technology that the particulate filter (hereinafter referred to as " filter ") that the trap particles material is set is arranged in order to prevent these particulate matters in the vent systems of internal-combustion engine.
In this filter, if the accumulating amount of the particulate matter that captures increases, then rise owing to the obstruction of filter causes back pressure in the exhaust, engine performance reduces, therefore, the particulate matter (hereinafter referred to as " PM Regeneration Treatment ") that makes the temperature of filter rise and come oxidation removal to capture.In the case, for the temperature that makes filter rises, sometimes also to the fuel of filter supply as reducing agent.
At this, following technology has been proposed, that is, carrying out NO xThe NO of catalyzer xReduction is handled, filter (is especially being supported NO xThe filter of catalyzer) when the PM Regeneration Treatment, when supplying with reducing agent, make the part of exhaust walk around NO xThe Exhaust gas purifying device of catalyzer, filter etc. reduces the flow by the exhaust of Exhaust gas purifying device.Thus, be suppressed at reducing agent and arrive Exhaust gas purifying device before by the problem of a large amount of exhaust oxidations, and, can fully guarantee the reaction time of reducing agent in Exhaust gas purifying device, can improve the regeneration efficiency of the purifying ability of Exhaust gas purifying device.
About the technology of such emission control system, there is for example disclosed technology of TOHKEMY 2002-349236 communique.That is to say, NO is set on waste pipe xThe occlusion reducing catalyst, but the liquid ejecting nozzle of injection reduction agent is arranged on NO xOn the outlet pipe of the exhaust-gas upstream side of occlusion reducing catalyst.In addition, the particulate filter that plays the oxidation catalyst effect is arranged on NO xOn the outlet pipe in the exhaust downstream side of occlusion reducing catalyst.And, to walk around NO xThe mode of occlusion reducing catalyst is connected bypass tube on the outlet pipe, and exhaust regulating valve switches makes blast air to NO xThe either party of occlusion reducing catalyst or bypass tube.Based on detecting NO xThe injection of reducing agent and the aperture of exhaust regulating valve are controlled in the detection output of the temperature transducer of the delivery temperature in the outlet pipe of the exhaust-gas upstream side of occlusion reducing catalyst respectively.
In this technology, when delivery temperature deficiency predetermined value, close the injection of reducing agent, regulate exhaust regulating valve and make exhaust flow into NO xOcclusion reducing catalyst and do not flow into bypass tube.Thus, the NO in the exhaust xIn catalyzer, the HC in the exhaust is oxidized under the oxidation of the precious metal that catalyzer supported by occlusion.In delivery temperature is predetermined value when above, regulate exhaust regulating valve and make most blast air cross bypass tube and the blast air of a part is crossed catalyzer, and from the agent of liquid ejecting nozzle injection reduction.Thus, the excess air coefficient of the exhaust of catalyst inlet reduces, and by the NO of occlusion to catalyzer xWith reactions such as above-mentioned HC, become N 2, CO 2, H 2O discharges from catalyzer.In addition, a part that forms living HC etc. by the injection of reducing agent by catalyzer, be filtered device and captured.When the injection reduction agent, most blast air is crossed bypass tube, the exhaust inflow filter that excess air coefficient is high, and therefore, this is filtered oxidation under the oxidation of the reactive metal that filter supported, burnings such as HC that device captures.
Thus, can reduce NO contained in the exhaust efficiently xWith the discharge capacity of particulate, and can prevent under the state of gasification, to be discharged in the atmosphere from the reducing agent that liquid ejecting nozzle is ejected into the outlet pipe.
In addition, the Exhaust gas purifying device of the disclosed motor of TOHKEMY 2000-265827 communique has: be configured in the gas exhausting valve that the exhaust gas purification catalyst of the tight below of gas exhaust manifold, the bypass passageways of walking around exhaust gas purification catalyst, the sensor that detects delivery temperature and restriction exhaust flow into exhaust gas purification catalyst.Under the situation that the condition of the exhaust gas purification catalyst that should heat up is set up, controller weakens the restriction of gas exhausting valve, and the air displacement that flows into exhaust emission control catalyst is increased.Thus, do not make runnability, fuel availability worsen ground rising catalyst temperature.
But, at NO xIn the purifying ability Regeneration Treatment of reduction processing, PM Regeneration Treatment etc., walk around under the situation of Exhaust gas purifying device making exhaust, can improve the regeneration efficiency of the purifying ability of Exhaust gas purifying device, the raising of expectation purification ratio as described above, but the situation that but exists the cleaning of substances in the exhaust walk around just not to be discharged from, thereby may cause deterioration of emission by Exhaust gas purifying device.
The object of the present invention is to provide a technology, in the Regeneration Treatment of the purifying ability of Exhaust gas purifying device, supply with reducing agent to Exhaust gas purifying device, and make the part of exhaust walk around Exhaust gas purifying device, improve the discharging of exhaust thus more effectively.
Summary of the invention
The present invention in order to achieve the above object is with when the Regeneration Treatment of the purifying ability of Exhaust gas purifying device, supply with reducing agent, extraction flow control was as prerequisite when the amount by the exhaust of passing through bypass passageways in the exhaust of exhaust passage exercised of going forward side by side increased the regeneration that the amount that makes the exhaust by Exhaust gas purifying device reduces.And, its maximum is characterised in that, extraction flow control when whether discharge reduction of discharging from above-mentioned Exhaust gas purifying device based on cleaning of substances under the situation of extraction flow control when having carried out regeneration, that obtained by the rising of the purification ratio of above-mentioned Exhaust gas purifying device and the discharge increasing amount of being discharged from above-mentioned bypass passageways by the cleaning of substances that the increase of the exhaust by above-mentioned bypass passageways causes, decision carry out above-mentioned regeneration.
In more detail, the invention is characterized in, have:
Exhaust gas purifying device, it is arranged in the exhaust passage of internal-combustion engine, purifies the exhaust by above-mentioned exhaust passage;
Bypass passageways, it, and at the downstream side and the interflow, above-mentioned exhaust passage of above-mentioned Exhaust gas purifying device, makes by the exhaust of above-mentioned exhaust passage and walks around above-mentioned Exhaust gas purifying device from above-mentioned exhaust passage branch at the upstream side of above-mentioned Exhaust gas purifying device;
The reducing agent feed mechanism, it is supplied in exhaust by above-mentioned exhaust passage at the upstream side of above-mentioned Exhaust gas purifying device with reducing agent;
Regeneration sector, it is that prearranging quatity is when above in savings amount of cleaning of substances in above-mentioned Exhaust gas purifying device, carry out Regeneration Treatment, by supplying with reducing agent and this reducing agent is imported above-mentioned Exhaust gas purifying device to exhaust, the purifying ability of above-mentioned Exhaust gas purifying device is regenerated in this Regeneration Treatment from above-mentioned reducing agent feed mechanism; And
Extraction flow control mechanism during regeneration, when it carries out above-mentioned Regeneration Treatment at above-mentioned regeneration sector, extraction flow control when regenerating, amount by the exhaust of passing through above-mentioned bypass passageways in the exhaust of above-mentioned exhaust passage is increased, and make amount minimizing by the exhaust of above-mentioned Exhaust gas purifying device;
Extraction flow control when determining whether carrying out above-mentioned regeneration based on following two amounts, that is discharge reduction that cleaning of substances when, having carried out above-mentioned regeneration when carrying out above-mentioned Regeneration Treatment under the situation of extraction flow control, that obtained by the rising of the purification ratio of above-mentioned Exhaust gas purifying device is discharged from above-mentioned Exhaust gas purifying device and the discharge increasing amount of discharging from above-mentioned bypass passageways by the cleaning of substances that the increase of the exhaust by above-mentioned bypass passageways causes.
Thus, on this basis aspect two of the discharge reduction that cleaning of substances under can the situation of extraction flow control when having considered to have carried out regeneration, that obtained by the rising of the purification ratio of above-mentioned Exhaust gas purifying device is discharged from above-mentioned Exhaust gas purifying device and the discharge increasing amount of discharging from above-mentioned bypass passageways by the cleaning of substances that the increase of the exhaust by above-mentioned bypass passageways causes, extraction flow control when whether decision carries out regeneration.More particularly, can be only when being judged as when not carrying out regeneration extraction flow control, be discharged under the few situation of the quantitative change of cleaning of substances in downstream side of interflow portion of exhaust passage and bypass passageways, extraction flow is controlled when just carrying out regeneration.Therefore, extraction flow control the raising more effectively exhaust emissions in the time of can utilizing regeneration.
In above-mentioned, cleaning of substances is NO x, particulate matter etc. is included in the exhaust of internal-combustion engine, the general name of the material that should be purified by Exhaust gas purifying device.In addition, under the amount of cleaning of substances is situation more than the prearranging quatity, the purifying ability regeneration of Exhaust gas purifying device is referred to, at NO xOcclusion exceedingly is at occlusion reduced form NO xIn the catalyzer and cause occlusion reduced form NO xThe NO of catalyzer xUnder the situation that occlusion capacity significantly descends, exceedingly be deposited in the filter and cause carrying out NO under the situation that the back pressure of filter significantly rises at particulate matter xReduction processing, PM Regeneration Treatment etc.
In addition, the present invention is with when the Regeneration Treatment of the purifying ability of Exhaust gas purifying device, supply with reducing agent, extraction flow control was as prerequisite when the amount by the exhaust of passing through bypass passageways in the exhaust of exhaust passage exercised of going forward side by side increased the regeneration that the amount that makes the exhaust by Exhaust gas purifying device reduces.
The invention is characterized in, under the situation of judgement extraction flow control when having carried out regeneration, the discharge reduction that the cleaning of substances that is obtained by the rising of the purification ratio of Exhaust gas purifying device is discharged from Exhaust gas purifying device, what of the discharge increasing amount that the cleaning of substances that causes with increase by the exhaust by bypass passageways is discharged from bypass passageways, under the situation that is judged as the discharge increasing amount that cleaning of substances that discharge reduction that the cleaning of substances that obtained by the rising of the purification ratio of Exhaust gas purifying device discharges from Exhaust gas purifying device causes more than the increase by the exhaust by bypass passageways discharges from bypass passageways, extraction flow control when carrying out regeneration.
In more detail, it is characterized in that, also has cleaning of substances amount decision mechanism, what of the discharge increasing amount that this cleaning of substances amount decision mechanism is judged discharge reduction that cleaning of substances under the situation of extraction flow control when having carried out above-mentioned regeneration when carrying out above-mentioned Regeneration Treatment, that obtained by the rising of the purification ratio of above-mentioned Exhaust gas purifying device is discharged from above-mentioned Exhaust gas purifying device and the cleaning of substances that caused by the increase of the exhaust by above-mentioned bypass passageways is discharged from above-mentioned bypass passageways;
Under the situation of the discharge increasing amount that the cleaning of substances that discharge reduction that the cleaning of substances that utilizes above-mentioned cleaning of substances amount decision mechanism to be judged as to be obtained by the rising of the purification ratio of above-mentioned Exhaust gas purifying device is discharged from above-mentioned Exhaust gas purifying device causes more than the increase by the exhaust by above-mentioned bypass passageways is discharged from above-mentioned bypass passageways, extraction flow control when carrying out above-mentioned regeneration.
That is to say, be a kind of emission control system of internal-combustion engine, has:
Exhaust gas purifying device, it is arranged in the exhaust passage of internal-combustion engine, purifies the exhaust by above-mentioned exhaust passage;
Bypass passageways, it, and at the downstream side and the interflow, above-mentioned exhaust passage of above-mentioned Exhaust gas purifying device, makes by the exhaust of above-mentioned exhaust passage and walks around above-mentioned Exhaust gas purifying device from above-mentioned exhaust passage branch at the upstream side of above-mentioned Exhaust gas purifying device;
The reducing agent feed mechanism, it is supplied in exhaust by above-mentioned exhaust passage to the upstream side of the branching portion of above-mentioned bypass passageways branch with reducing agent above-mentioned exhaust passage;
Regeneration sector, it is that prearranging quatity is when above in savings amount of cleaning of substances in above-mentioned Exhaust gas purifying device, carry out Regeneration Treatment, by supplying with reducing agent and this reducing agent is imported above-mentioned Exhaust gas purifying device to exhaust, the purifying ability of above-mentioned Exhaust gas purifying device is regenerated in this Regeneration Treatment from above-mentioned reducing agent feed mechanism;
Extraction flow control mechanism during regeneration, when it carries out above-mentioned Regeneration Treatment at above-mentioned regeneration sector, extraction flow control when regenerating, amount by the exhaust of passing through above-mentioned bypass passageways in the exhaust of above-mentioned exhaust passage is increased, and make amount minimizing by the exhaust of above-mentioned Exhaust gas purifying device; And
What of the discharge increasing amount that cleaning of substances amount decision mechanism, this cleaning of substances amount decision mechanism are judged discharge reduction that cleaning of substances under the situation of extraction flow control when having carried out above-mentioned regeneration when carrying out above-mentioned Regeneration Treatment, that obtained by the rising of the purification ratio of above-mentioned Exhaust gas purifying device is discharged from above-mentioned Exhaust gas purifying device and the cleaning of substances that caused by the increase of the exhaust by above-mentioned bypass passageways is discharged from above-mentioned bypass passageways;
Under the situation of the discharge increasing amount that the cleaning of substances that discharge reduction that the cleaning of substances that utilizes above-mentioned cleaning of substances amount decision mechanism to be judged as to be obtained by the rising of the purification ratio of above-mentioned Exhaust gas purifying device is discharged from above-mentioned Exhaust gas purifying device causes more than the increase by the exhaust by above-mentioned bypass passageways is discharged from above-mentioned bypass passageways, extraction flow control when carrying out above-mentioned regeneration.
Thus, only when not carrying out when regeneration extraction flow control, when extraction flow is controlled when having carried out regeneration, be discharged under the situation that the total amount (the discharge increasing amount that discharge reduction that the cleaning of substances that is obtained by the rising of the purification ratio of above-mentioned Exhaust gas purifying device is discharged from above-mentioned Exhaust gas purifying device and the cleaning of substances that caused by the increase of the exhaust by above-mentioned bypass passageways are discharged from above-mentioned bypass passageways poor) of cleaning of substances in downstream side of the interflow portion of exhaust passage and bypass passageways tails off extraction flow control in the time of to carry out regeneration.Therefore, extraction flow control the raising more effectively exhaust emissions in the time of can utilizing regeneration.
In addition, in the present invention, above-mentioned cleaning of substances amount decision mechanism can carry out following judgement, that is, judge from above-mentioned Regeneration Treatment, begin to supply with reducing agent begin in next Regeneration Treatment to supply with reducing agent during in, the discharge increasing amount of the discharge reduction of the cleaning of substances that obtains by the rising of the purification ratio of above-mentioned Exhaust gas purifying device and the cleaning of substances that causes by the increase of the exhaust by above-mentioned bypass passageways what.
At this, under the situation of extraction flow control, extraction flow is controlled when regenerating during reducing agent feed mechanism supply reducing agent when having carried out regeneration in Regeneration Treatment.Like this, the discharge of the cleaning of substances that causes of the increase of the exhaust by bypass passageways is increased in that the extraction flow control period produces when carrying out regeneration.On the other hand, because when carrying out regeneration in the extraction flow control period, the purifying ability of Exhaust gas purifying device regenerated, so, afterwards until the cleaning of substances savings during Exhaust gas purifying device, because the raising of purification ratio, the discharge of cleaning of substances reduces.And, be starting point in next Regeneration Treatment, to supply with reducing agent, carry out same variation repeatedly.
Therefore, extraction flow control when in each Regeneration Treatment, whether carrying out regeneration, magnitude relationship based on following two amounts is appropriate, that is, from Regeneration Treatment, begin to supply with reducing agent begin in next Regeneration Treatment to supply with reducing agent during, by the rising of the purification ratio of Exhaust gas purifying device and the increasing amount of the discharge of the reduction of the discharge of the cleaning of substances that obtains and the cleaning of substances that causes by the increase of the exhaust by bypass passageways.
Therefore, in the present invention, judge from Regeneration Treatment, begin to supply with reducing agent begin in next Regeneration Treatment to supply with reducing agent during in, the increasing amount of the discharge of the reduction of the discharge of the cleaning of substances that obtains by the rising of the purification ratio of Exhaust gas purifying device and the cleaning of substances that causes by the increase of the exhaust by bypass passageways what.
In view of the above, can be benchmark with total discharge capacity of the cleaning of substances during each Regeneration Treatment whole, the execution of extraction flow control when regenerating judges, so extraction flow is controlled and improved exhaust emissions in the time of can utilizing regeneration more effectively.
In addition, in the present invention, above-mentioned Exhaust gas purifying device is occlusion reduced form NO xCatalyzer;
Also have oxidation catalyst, this oxidation catalyst is arranged at the downstream side of the interflow portion of exhaust passage in the above-mentioned exhaust passage, above-mentioned and above-mentioned bypass passageways, has oxidability;
Extraction flow control when determining whether carrying out above-mentioned regeneration based on following three amounts, that is, and NO when when carrying out above-mentioned Regeneration Treatment, having carried out above-mentioned regeneration under the situation of extraction flow control, that obtain by the rising of the purification ratio of above-mentioned Exhaust gas purifying device xThe discharge reduction of discharging from above-mentioned Exhaust gas purifying device, the NO that causes by the increase of the exhaust by above-mentioned bypass passageways xFrom the discharge increasing amount of above-mentioned bypass passageways discharge and the NH that discharges from above-mentioned Exhaust gas purifying device 3The NO that produces by above-mentioned oxidation catalyst oxidizes xIncreasing amount.
At this, consider that the Exhaust gas purifying device of internal-combustion engine is occlusion reduced form NO xThe situation of catalyzer.In the case, when Regeneration Treatment, occlusion (comprising absorption, sorption) is at occlusion reduced form NO xNO in the catalyzer xWith the NO that in Regeneration Treatment, newly discharges from internal-combustion engine xIn major part be reduced, and wherein a part becomes NH 3, from occlusion reduced form NO xCatalyzer is discharged.So, have this NH 3A part oxidized and return to NO in the oxidation catalyst in downstream xSituation.Like this, there is consequent NO xThe NO that causes the whole vent systems of internal-combustion engine xThe situation of the reduction of purification ratio.
And with it relatively, in the present invention, can consider extraction flow control when following three amounts determine whether carrying out regeneration, that is, and NO when having carried out regeneration under the situation of extraction flow control, that obtain by the rising of the purification ratio of above-mentioned Exhaust gas purifying device xThe discharge reduction of discharging from above-mentioned Exhaust gas purifying device, the NO that causes by the increase of the exhaust by above-mentioned bypass passageways xFrom the discharge increasing amount of above-mentioned bypass passageways discharge and the NH that discharges from above-mentioned Exhaust gas purifying device 3The NO that produces by above-mentioned oxidation catalyst oxidizes xIncreasing amount.More particularly, only can judge when not carrying out when regeneration extraction flow control, be discharged to the NO in the downstream side of oxidation catalyst xAmount situation about reducing under extraction flow control can carry out regeneration the time.Therefore, extraction flow control the raising more effectively exhaust emissions in the time of can utilizing regeneration.
In addition, in the present invention, also has NO xThe amount decision mechanism, it judges NO under the situation of extraction flow control when having carried out above-mentioned regeneration when carrying out above-mentioned Regeneration Treatment, that obtained by the rising of the purification ratio of above-mentioned Exhaust gas purifying device xThe discharge reduction of discharging from above-mentioned Exhaust gas purifying device, the NO that causes with increase by the exhaust by above-mentioned bypass passageways xFrom the discharge increasing amount of above-mentioned bypass passageways discharge and the NH that discharges from above-mentioned Exhaust gas purifying device 3The NO that produces by above-mentioned oxidation catalyst oxidizes xWhat of total amount of increasing amount;
Utilizing above-mentioned NO xThe amount decision mechanism is judged as the NO that is obtained by the rising of the purification ratio of above-mentioned Exhaust gas purifying device xThe NO that the discharge reduction of discharging from above-mentioned Exhaust gas purifying device causes more than the increase by the exhaust by above-mentioned bypass passageways xFrom the discharge increasing amount of above-mentioned bypass passageways discharge and the NH that discharges from above-mentioned Exhaust gas purifying device 3The NO that produces by above-mentioned oxidation catalyst oxidizes xThe situation of total amount of increasing amount under, extraction flow control when carrying out above-mentioned regeneration.
Thus, only when not carrying out when regeneration extraction flow control, during extraction flow control, be discharged to the NO in the downstream side of oxidation catalyst when having carried out regeneration xTotal amount (by the rising of the purification ratio of above-mentioned Exhaust gas purifying device and the NO that obtains xThe NO that the discharge reduction of discharging from above-mentioned Exhaust gas purifying device and increase by the exhaust by above-mentioned bypass passageways cause xFrom the discharge increasing amount of above-mentioned bypass passageways discharge and the NH that discharges from above-mentioned Exhaust gas purifying device 3The NO that produces by above-mentioned oxidation catalyst oxidizes xTotal amount poor of increasing amount) under the situation about tailing off, extraction flow control in the time of can carrying out regeneration.Therefore, extraction flow control the raising more effectively exhaust emissions in the time of can utilizing regeneration.
In addition, in the present invention, above-mentioned NO xThe amount decision mechanism carries out following judgement, that is, judge in that (at this is NO from above-mentioned Regeneration Treatment xReduction is handled) in begin to supply with reducing agent begin in next Regeneration Treatment to supply with reducing agent during in, the NO that obtains by the rising of the purification ratio of above-mentioned Exhaust gas purifying device xThe discharge reduction of discharging from above-mentioned Exhaust gas purifying device, the NO that causes with increase by the exhaust by above-mentioned bypass passageways xFrom the discharge increasing amount of above-mentioned bypass passageways discharge and the NH that discharges from above-mentioned Exhaust gas purifying device 3The NO that produces by above-mentioned oxidation catalyst oxidizes xWhat of total amount of increasing amount.
At this, as mentioned above, extraction flow control when in each Regeneration Treatment, whether carrying out regeneration, magnitude relationship based on following two amounts is appropriate, promptly, from Regeneration Treatment, begin to supply with reducing agent begin in next Regeneration Treatment to supply with reducing agent during in, by the rising of the purification ratio of Exhaust gas purifying device and the NO that obtains xThe reduction, the NO that causes with increase of discharge by the exhaust by bypass passageways xFrom the discharge increasing amount of above-mentioned bypass passageways discharge and the NH that discharges from above-mentioned Exhaust gas purifying device 3The NO that produces by above-mentioned oxidation catalyst oxidizes xThe total amount of increasing amount.
Therefore, in the present invention, judge from Regeneration Treatment, begin to supply with reducing agent begin in next Regeneration Treatment to supply with reducing agent during in, the NO that obtains by the rising of the purification ratio of above-mentioned Exhaust gas purifying device xThe discharge reduction of discharging from above-mentioned Exhaust gas purifying device, the NO that causes with increase by the exhaust by above-mentioned bypass passageways xFrom the discharge increasing amount of above-mentioned bypass passageways discharge and the NH that discharges from above-mentioned Exhaust gas purifying device 3The NO that produces by above-mentioned oxidation catalyst oxidizes xWhat of total amount of increasing amount.
In view of the above, also can be with the NO during each Regeneration Treatment whole xTotal discharge capacity be benchmark, the execution of extraction flow control when regenerating judges, so extraction flow is controlled and improved exhaust emissions in the time of can utilizing regeneration more effectively.
Of the present inventionly can carry out limited combination and use for the mechanism that deals with problems.
Description of drawings
Fig. 1 is the figure of the schematic configuration of the expression internal-combustion engine of embodiments of the invention 1 and vent systems and control system.
Fig. 2 is that the fuel of expression embodiments of the invention adds and the example of the sequential chart of the switching timing of switching valve.
Fig. 3 is that the flow chart of judging routine (routine) is carried out in the synchronous by-pass governing of interpolation of expression embodiments of the invention 1.
Fig. 4 is the figure of the schematic configuration of the expression internal-combustion engine of embodiments of the invention 2 and vent systems and control system.
Fig. 5 is that the flow chart of judging routine 2 is carried out in the synchronous by-pass governing of interpolation of expression embodiments of the invention 2.
Embodiment
Carry out the detailed description of illustration ground to being used to implement best mode of the present invention with reference to the accompanying drawings.
Embodiment 1
Fig. 1 is the figure of the schematic configuration of the expression internal-combustion engine of present embodiment and vent systems and control system.Internal-combustion engine 1 shown in Figure 1 is a diesel engine.In Fig. 1, omit the inside and the gas handling system thereof of internal-combustion engine 1.
In Fig. 1, on internal-combustion engine 1, connecting outlet pipe 5 as the exhaust passage of the exhaust circulation of discharging from internal-combustion engine 1, this outlet pipe 5 is connected in not shown silencing apparatus in the downstream.In addition,, disposing the NO in the purifying exhaust gas at outlet pipe 5 midway xOcclusion reduced form NO xCatalyzer (being designated hereinafter simply as " NSR ") 10.Downstream side at the NSR10 of outlet pipe 5 is disposing the filter 11 that captures the particulate matter in the exhaust.Also can constitute additional oxidation catalyst CCo in NSR10 with oxidability.
In addition, the branching portion 5a place in the upstream of NSR10 branches out bypass tube 6 as bypass passageways from outlet pipe 5.On bypass tube 6, have to switch and make from the exhaust of internal-combustion engine 1 by bypass tube 6 or the switching valve that passes through 15 that cuts off this exhaust.In addition, part place and outlet pipe 5 interflow of bypass tube 6 between NSR10 and filter 11.
At this, make switching valve 15 actions, make from the exhaust of internal-combustion engine 1 and pass through outlet pipe 5 with keeping intact, thus, can make exhaust by NSR10 and filter 11 both sides.Similarly, by making from the exhaust of internal-combustion engine 1, can make exhaust walk around NSR10 and only by filter 11 by bypass tube 6.
In the NSR10 of outlet pipe 5 upstream side configuration fuel addition valve 14, at the NO of NSR10 xReduction is handled or SO xDuring the catalyst poisoning Regeneration Treatment, during the PM Regeneration Treatment of filter 11, in exhaust, add fuel as reducing agent.In above-mentioned, NSR10 is equivalent to Exhaust gas purifying device in the present embodiment.In addition, fuel addition valve 14 is equivalent to the reducing agent feed mechanism.
In the internal-combustion engine 1 of above-mentioned formation and vent systems thereof and be provided with the electronic control unit (ECU:Electronic Control Unit) 20 that is used to control this internal-combustion engine 1 and vent systems.This ECU20 is except according to the operating condition of internal-combustion engine 1, driver's the operating condition that requires controlling combustion engine 1 etc., comprises the unit of control of emission control system of NSR10, the filter 11 of internal-combustion engine 1.
At ECU20, connecting the relevant sensor class of control not shown Air flow meter, crank position sensor, accelerator pedal position sensor etc. and operating condition internal-combustion engine 1 by electric distribution, and output signal is being input among the ECU20.On the other hand, ECU20 is last to connect not shown Fuelinjection nozzle in the internal-combustion engine 1 etc. by electric distribution, in addition, is also connecting the switching valve 15, fuel addition valve 14 of present embodiment etc. by electric distribution, utilizes ECU20 to control.
In addition, in ECU20, have CUP, ROM, RAM etc., storing among the ROM the various controls that are used to carry out internal-combustion engine 1 program, accommodate the chart (mapping) of (depositing) data.Carry out in the synchronous by-pass governing of the interpolation of the present embodiment of following explanation and to judge that routine also is one of program among the ROM that is stored in the ECU20.
At this, in said structure, consider to carry out the NO of NSR10 xThe situation that reduction is handled.At this moment, from the fuel of fuel addition valve 14 interpolations as reducing agent, and, during adding fuel, open switching valve 15, a part that makes exhaust is by bypass tube 6.Thus, reduce to flow into the amount (low SV (Space Velocity, spatial velocity) changes) of the exhaust of NSR10, can suppress the fuel that adds from fuel addition valve 14 before arriving NSR10 with regard to oxidized used up problem.In addition, the fuel of NSR10 is fully finished reduction reaction in NSR10 time can be guaranteed to have arrived, NO can be improved xReduction efficiency (following this control is called " adding synchronous by-pass governing ").In Fig. 2, represented NO xThe fuel from fuel addition valve 14 during reduction is handled adds and the sequential chart of the switching of switching valve 15.Extraction flow control when adding synchronous by-pass governing and being equivalent to regenerate, flow control mechanism when carrying out the ECU20 that adds synchronous by-pass governing and switching valve 15 and constituting regeneration.In addition, ECU20 also is regeneration sector in the present embodiment.
But when adding synchronous by-pass governing, during opening switching valve 15, exhaust does not just flow out to the downstream side by NSR10 via bypass tube 6, thereby has increased the NO that just discharges without purifying xAmount.Can expect according to NO xThe interval conditions such as (interval) that reduction is handled is from the discharge NO of bypass tube 6 discharges xThe increasing amount of amount is more than owing to the purification ratio that has improved NSR10 is discharged NO xThe amount that amount reduces, thus total emission volumn worsens.
That is to say, for example, although it is certain to add time of opening of switching valve 15 of synchronous by-pass governing sometimes, but NO xThe interval that reduction is handled is but corresponding to the NO among the NSR10 xOcclusion amount, the NO that discharges from internal-combustion engine 1 xMeasure and significantly variation.At this moment, the discharge NO that produces owing to the raising of the purification ratio of NSR10 xThe reduction of amount and from the discharge NO of bypass tube 6 xMagnitude relationship between the increasing amount of amount may change.
In addition, also consider according to the suitability under the steady state and make above-mentioned discharge NO in advance xWhat judgement of amount, but in this method, but have the problem that is difficult to tackle the interval variation under the transition state of reality.
Therefore, in the present embodiment, for NO xThe interval that reduction is handled, the relatively raising of the purification ratio of NSR10 and the discharge NO that produces xThe reduction of amount and from the discharge NO of bypass tube 6 xThe increasing amount of amount, only the discharge NO that produces in the raising of the purification ratio that is judged as NSR10 xThe reduction of amount is recently from the discharge NO of bypass tube 6 xUnder the increasing amount of the amount situation how, just add synchronous by-pass governing.
Fig. 3 represents the flow chart of the synchronous by-pass governing execution of the interpolation of present embodiment judgement routine.This routine is the program among the ROM that is stored in the ECU20, is at NO xThe routine of carrying out whenever the scheduled period by ECU20 in the execution that reduction is handled.
When carrying out this routine, at first, in S101, derive the NO that time per unit is discharged from internal-combustion engine 1 by this internal-combustion engine rotational speed and fuel injection amount constantly xAmount (g/s).Specifically, from accommodating the NO that internal-combustion engine rotational speed and fuel injection amount and time per unit are discharged from internal-combustion engine 1 xIn the chart of the relation between the amount, read the NO that discharges with the internal-combustion engine rotational speed and the corresponding time per unit of fuel injection amount in this moment xAmount derives thus.When the processing of S101 finishes, enter into S102.
In S102,, derive by the exhaust of switching valve 15 controls split ratio to bypass tube 6 based on this suction air quantity constantly.Specifically, become when sucking air quantity and adding synchronous by-pass governing the chart of the relation between the split ratio of control target, read the value with the corresponding split ratio of suction air quantity in this moment, derive thus from accommodating.When the S102 processing finishes, enter into S103.
In S103, the NO that calculates during opening switching valve 15, discharges via bypass tube 6 xIncreasing amount.Specifically, the NO by discharging from internal-combustion engine 1 with the opening the time of switching valve 15 (s), with the time per unit of deriving at S101 xAmount (g/s) and multiply each other and calculate in the split ratio that S102 derives.When the S103 processing finishes, enter into S104.
In S104, bed temperature and suction air quantity from this NSR10 constantly derive the NO that obtains by adding synchronous by-pass governing (low SVization) xThe ascending amount of purification ratio.Specifically, bed temperature and suction air quantity and the NO from accommodating NSR10 xIn the chart of the relation between the purification ratio ascending amount, read with the bed temperature of the NSR10 in this moment and suck the corresponding NO of air quantity xThe value of the ascending amount of purification ratio derives thus.When the S104 processing finishes, enter into S105.
In S105, calculate the NO that obtains by adding synchronous by-pass governing from the NSR10 discharge xReduction.Specifically, by with NO xReduction is (s) and the NO of time per unit from internal-combustion engine 1 discharge at interval xAmount (g/s) and the NO that produces by low SVization xThe ascending amount of purification ratio multiplies each other and calculates.When the S105 processing finishes, enter into S106.
In S106, the NO that during switching valve 15 is opened, discharges that relatively in S103, calculates via bypass tube 6 xDischarge capacity and the NO that obtains by adding synchronous by-pass governing that in S105, calculates from the NSR10 discharge xReduction.Be judged as the NO that obtains by adding synchronous by-pass governing xThe reduction of discharging is more than the NO that discharges via bypass tube 6 during the opening of switching valve 15 xUnder the situation of discharge capacity, enter into S107.And on the other hand, when being judged as the NO that during the opening of switching valve 15, discharges via bypass tube 6 xDischarge capacity is for adding the NO that synchronous by-pass governing obtains xWhen the reduction of discharging is above, once finishing this routine at this point.
In S107, carry out and add synchronous by-pass governing.When the processing of S107 finishes, once finishing this routine.
Like this, in this routine, compare the NO that during opening switching valve 15, discharges via bypass tube 6 xAmount (also is referred to as to discharge NO xThe increasing amount of amount) and the NO that discharges from NSR10 of obtaining of in S105, calculating by adding synchronous by-pass governing xReduction, only be judged as the NO that discharges from NSR10 that obtains by adding synchronous by-pass governing xThe many situation of reduction under just carry out and add synchronous by-pass governing.Therefore, can just carry out and add synchronous by-pass governing only being judged as by the execution synchronous by-pass governing of interpolation and can improving under the situation of total discharging, thus the effect of the discharging that can be improved more effectively.
In above-mentioned, the ECU20 of the processing of execution S101～S106 is equivalent to the cleaning of substances amount decision mechanism in the present embodiment.
In addition, in the above-described embodiments, be that the situation of NSR10 is illustrated to Exhaust gas purifying device, but Exhaust gas purifying device also can be to support occlusion reduced form NO in filter xThe DPNR of catalyzer also can be selective reduction type NO xCatalyzer.In addition, be under the situation of DPNR at Exhaust gas purifying device, the present invention also goes for the PM regeneration of DPNR.And the present invention also goes for using as reducing agent the emission control system of fuel liquid (for example urea water) in addition.And be not limited to add fuel from fuel addition valve 14 to the method for Exhaust gas purifying device fueling, also can spray and realize by for example pair of internal-combustion engine 1.
In addition, in the above-described embodiments, adding synchronous by-pass governing is to be undertaken by the switching of switching switching valve 15, but also can be by changing the aperture of switching valve 15 continuously, suitably adjust the amount by the exhaust by bypass tube 6 in the exhaust of outlet pipe 5 and the amount of the exhaust by NSR10 and carry out.Also can be used as substituting of switching valve 15, adopt the three-way valve that is configured in branching portion 5a to control.
In addition, carry out in the judgement routine, in the synchronous by-pass governing of above-mentioned interpolation for Regeneration Treatment (NO xReduction) at interval, compared the NO that during the opening of switching valve 15, discharges via bypass tube 6 xAmount and the NO that obtains by the purification ratio that improves NSR10 xThe reduction of discharging.But, become this comparison other during be not limited to NO xReduction at interval.For example, after adding synchronous by-pass governing end, the purification ratio of NSR10 is along with NO xOcclusion little by little worsen, therefore, can be with the NO that in fact can expect significantly to obtain by the purification ratio that improves NSR10 xCompare as object during the minimizing of discharging.In addition, for a plurality of NO xReduction at interval, the NO that can be relatively during the opening of switching valve 15, discharges via bypass tube 6 xThe mean value of amount and the NO that obtains by the purification ratio that improves NSR10 xThe mean value of the reduction of discharging.
In addition, carry out among the S101～S105 that judges routine, calculate the NO that during the opening of switching valve 15, discharges via bypass tube 6 in the synchronous by-pass governing of above-mentioned interpolation xAmount and the NO that obtains by adding synchronous by-pass governing from the NSR10 discharge xThe method of reduction be not confined to the method shown in the present embodiment especially.If Calculation Method is more accurately arranged, then can carry out suitable change.
In addition, in the above-described embodiments, in the S106 that adds synchronous by-pass governing execution judgement routine, the NO that during switching valve 15 is opened, discharges that relatively in S103, calculates via bypass tube 6 xDischarge capacity and the NO that obtains by adding synchronous by-pass governing that in S105, calculates from the NSR10 discharge xReduction.Only be judged as the NO that obtains by adding synchronous by-pass governing from the NSR10 discharge xReduction more than the NO that during the opening of switching valve 15, discharges via bypass tube 6 xUnder the situation of discharge capacity, carry out and add synchronous by-pass governing.
But, based on the NO that discharges via bypass tube 6 during opening at switching valve 15 xDischarge capacity and the NO that obtains by adding synchronous by-pass governing from the NSR10 discharge xReduction, whether decision carries out the method for adding synchronous by-pass governing is not limited thereto.For example, the NO that during switching valve 15 is opened, discharges that in S103, calculates via bypass tube 6 xDischarge capacity and the NO that obtains by adding synchronous by-pass governing that in S105, calculates from the NSR10 discharge xReduction, under situation about there are differences on the calculation accuracy, can suitably carry out the either party be multiply by the change of Weighting factor etc.
That is to say, so long as substantially considered during switching valve 15 is opened the NO that discharges via bypass tube 6 xAmount and the NO that obtains by adding synchronous by-pass governing from the NSR10 discharge xThese two factors of reduction after be judged as under the situation that total discharging improves, carry out and add synchronous by-pass governing and get final product.
Embodiment 2
Below embodiments of the invention 2 are described.In the present embodiment, following example is described: NSR and oxidation catalyst are set in the vent systems of internal-combustion engine; Whether add in the judgement of synchronous by-pass governing, except the discharge NO that obtains by the purification ratio that improves NSR10 xThe reduction of amount and from the discharge NO of bypass tube 6 xBeyond the increasing amount of amount, also consider at NO xThe NH that discharges from NSR during reduction is handled 3Oxidized catalyst oxidation and the NO that obtains xIncreasing amount.
Fig. 4 represents the internal-combustion engine of present embodiment and the schematic configuration of vent systems and control system thereof.In the present embodiment, fuel addition valve 24 is configured in outlet pipe 5 on the outlet pipe 5 in the downstream side of the branching portion 5a of bypass tube 6 branches.In addition, the more downstream sides in the interflow portions downstream side and bypass tube 6 interflow of the NSR10 of outlet pipe 5 are disposing oxidation catalyst 21.Other structures below the structure identical with structure shown in Figure 1 adopted identical symbol, and its explanation are omitted with shown in Figure 1 identical.In addition, in the present embodiment, carry out NO according to sequential chart shown in Figure 2 xReduction is handled.
In this structure, consider the NO that adds synchronous by-pass governing, carries out NSR10 xThe situation that reduction is handled.In this case, in NSR10,, make the NO of occlusion in NSR10 by adding fuel from fuel addition valve 24 xWith the NO that discharges from internal-combustion engine 1 xMajor part is reduced, and a part becomes NH 3, discharge from NSR10.
At this, there is the NH that discharges from NSR10 3Oxidized at oxidation catalyst 21 places, become NO once more xSituation.Like this, just there is consequent NO xDischarge from oxidation catalyst 21, the result has reduced NO xThe situation of purification ratio.
And with it relatively, in the present embodiment, for NO xThe interval that reduction is handled, relatively the discharge NO that obtains by the purification ratio that improves NSR10 xThe reduction of amount, with from the discharge NO of bypass tube 6 xThe increasing amount of amount and the NH that discharges from NSR10 3Oxidized catalyzer 21 oxidations and the NO that obtains xThe total amount of increasing amount only is being judged as the discharge NO that is obtained by the purification ratio that improves NSR10 xThe reduction of amount is more than the discharge NO from bypass tube 6 xThe increasing amount of amount and the NH that discharges from NSR10 3Oxidized catalyzer 21 oxidations and the NO that obtains xUnder the situation of the total amount of increasing amount, just add synchronous by-pass governing.
Fig. 5 represents the flow chart of the synchronous by-pass governing execution of the interpolation of present embodiment judgement routine 2.This routine is the program among the ROM that is stored in the ECU20, is at NO xThe routine of carrying out whenever the scheduled period by ECU20 in the execution that reduction is handled.The processing of S101～S105 in this routine is carried out with the synchronous by-pass governing of interpolation shown in Figure 3 and is judged that routine is identical, so its explanation is omitted.
In the S201 of this routine, by at NO shown in Figure 2 xThe NO that discharges from internal-combustion engine 1 in the reduction (Regeneration Treatment) at interval xAmount and the NO of occlusion in NSR10 xThe summation of amount and the value of inferring air fuel ratio when adding synchronous by-pass governing derive at NO xThe NH that from NSR10, discharges in the reduction at interval 3Amount.
Specifically, the NO that discharges from internal-combustion engine 1 by the time per unit that will in S101, derive xAmount (g/s) and NO xThe NO of occlusion among NSR10 that the reduction interlude multiplies each other the value that obtains and infers from the experience of the operating condition of internal-combustion engine 1 xAmount derives NO xThe summation of amount.In chart, contain this NO xThe summation of amount, based on the fuel quantity that to exhaust, adds from fuel addition valve 24 with suck air quantity and the air fuel ratio of inferring and at NO xThe NH that discharges from NSR10 in the reduction at interval 3Amount between relation.By from this chart, reading the NO that derives with this moment xThe summation of amount and the corresponding NH of air fuel ratio that infers 3Amount.At this moment, at NO xThe NO that discharges from internal-combustion engine 1 in the reduction (Regeneration Treatment) at interval xThe part of amount does not import among the NSR10 by bypass tube 6, but this value is left in the basket as error in the present embodiment.When the processing of S201 finishes, enter S202.
In S202, derive the NH that discharges from NSR10 from the bed temperature of oxidation catalyst 21 3In oxidation catalyst 21 to NO xThe conversion ratio that transforms.Specifically, from the chart of the bed temperature of accommodating oxidation catalyst 21 and the relation between the conversion ratio, by reading the value that derives with respect to the conversion ratio of the bed temperature of the oxidation catalyst 21 in this moment.The bed temperature of oxidation catalyst 21 can obtain from the temperature of the exhaust of oxidation catalyst discharge by utilizing not shown exhaust gas temperature sensor detection.In addition, also can infer from the operating condition of internal-combustion engine 1.When the processing of S202 finishes, enter S203.
In S203, calculate the NH that discharges from NSR10 3The NO that produces by oxidation catalyst 21 oxidations xAmount.Specifically, by will in S201, derive at NO xThe NH that discharges from NSR10 in the reduction at interval 3Amount and in S202, derive to NO xConversion ratio multiply each other, calculate at NO xThe NH that discharges from NSR10 in the reduction at interval 3The NO that produces by oxidation catalyst 21 oxidations xAmount.When the processing of S203 finishes, enter S204.
In S204, the NO that during switching valve 15 is opened, discharges that relatively in S103, calculates via bypass tube 6 xDischarge capacity and in S203, calculate at NO xThe NH that discharges from NSR10 in the reduction at interval 3The NO that produces by oxidation catalyst 21 oxidations xAmount total amount, with the NO that discharges from NSR10 of obtaining of in S105, calculating by adding synchronous by-pass governing xReduction.Be judged as the NO that obtains by adding synchronous by-pass governing from the NSR10 discharge xReduction more than the NO that discharges via bypass tube 6 during opening at switching valve 15 xDischarge capacity and at NO xThe NH that discharges from NSR10 in the reduction at interval 3The NO that produces by oxidation catalyst 21 oxidations xThe total amount of amount the time, enter S107.And on the other hand, be judged as the NO that this total amount is served as reasons and added synchronous by-pass governing and obtain from the NSR10 discharge xThe above situation of reduction under, once finishing this routine at this point.
Like this, in this routine, compare the NO that during switching valve 15 is opened, discharges via bypass tube 6 xDischarge capacity and in S203, calculate at NO xThe NH that discharges from NSR10 in the reduction at interval 3The NO that produces by oxidation catalyst 21 oxidations xAmount total amount, with the NO that discharges from NSR10 that obtains by adding synchronous by-pass governing xReduction, only be judged as the NO that discharges from NSR10 that obtains by adding synchronous by-pass governing xThe situation of reduction more than this total amount under, carry out to add synchronous by-pass governing.Therefore, can just carry out and add synchronous by-pass governing only being judged as by the execution synchronous by-pass governing of interpolation and can improving under the situation of total discharging, thus the effect of the discharging that can be improved more effectively.
In the present embodiment, the ECU20 of the processing of execution S101～S204 is equivalent to the NO in the present embodiment xThe amount decision mechanism.
In addition, carry out in the judgement routine 2, in the synchronous by-pass governing of above-mentioned interpolation for NO xReduction has at interval been compared the NO that discharges via bypass tube 6 during the opening of switching valve 15 xDischarge capacity and at NO xThe NH that discharges from NSR10 in the reduction at interval 3The NO that produces by oxidation catalyst 21 oxidations xAmount total amount, with the NO that obtains by the purification ratio that improves NSR10 xThe reduction of discharging.But, become this comparison other during be not limited to NO xReduction at interval.For example, for a plurality of NO xReduction at interval, the NO that also can be relatively during the opening of switching valve 15, discharges via bypass tube 6 xDischarge capacity and at NO xThe NH that discharges from NSR10 in the reduction at interval 3The NO that produces by oxidation catalyst 21 oxidations xAmount total amount mean value, with the NO that obtains by the purification ratio that improves NSR10 xThe mean value of the reduction of discharging.
In addition, carry out among the S201～S203 that judges routine 2, calculate at NO in the synchronous by-pass governing of above-mentioned interpolation xThe NH that discharges from NSR10 in the reduction at interval 3The NO that produces by oxidation catalyst 21 oxidations xThe method of amount be not confined to the method shown in the present embodiment especially.If Calculation Method is more accurately arranged, then can carry out suitable change.
In addition, in the S204 that adds synchronous by-pass governing execution judgement routine 2, compare the NO that in S103, calculates xDischarge capacity and the NO that in S203, calculates xThe total amount of production, with the NO that in S105, calculates xThe reduction of discharging.Only be judged as the NO that in S105, calculates xThe reduction of discharging is more than the NO that calculates in S103 xDischarge capacity and the NO that in S203, calculates xUnder the situation of the total amount of production, carry out and add synchronous by-pass governing.
But, based on the NO that discharges via bypass tube 6 during opening at switching valve 15 xDischarge capacity, the NO that obtains by adding synchronous by-pass governing from the NSR10 discharge xReduction and the NH that discharges from NSR10 3The NO that produces by oxidation catalyst 21 oxidations xAmount determine whether carrying out the method for adding synchronous by-pass governing and be not limited thereto.For example, the NO that in S103, calculates xDischarge capacity, the NO that in S105, calculates xReduction of discharging and the NO that in S203, calculates xProduction, under situation about there are differences on the calculation accuracy, can suitably carry out the either party be multiply by the change of Weighting factor etc.
That is to say, so long as substantially considered during switching valve 15 is opened the NO that discharges via bypass tube 6 xAmount, the NH that discharges from NSR10 3The NO that produces by oxidation catalyst 21 oxidations xAmount and the NO that discharges from NSR10 that obtains by adding synchronous by-pass governing xThese three factors of reduction after be judged as under the situation that total discharging improves, carry out and add synchronous by-pass governing and get final product.
In the present invention, in the Regeneration Treatment of the purifying ability of Exhaust gas purifying device,, can improve the discharging of exhaust more effectively by supplying with reducing agent and make the part of exhaust walk around Exhaust gas purifying device to Exhaust gas purifying device.

Claims (6)

1. the emission control system of an internal-combustion engine is characterized in that, has:
Exhaust gas purifying device, it is arranged in the exhaust passage of internal-combustion engine, purifies the exhaust by above-mentioned exhaust passage;
Bypass passageways, it, and at the downstream side and the interflow, above-mentioned exhaust passage of above-mentioned Exhaust gas purifying device, makes by the exhaust of above-mentioned exhaust passage and walks around above-mentioned Exhaust gas purifying device from above-mentioned exhaust passage branch at the upstream side of above-mentioned Exhaust gas purifying device;
The reducing agent feed mechanism, it is supplied in exhaust by above-mentioned exhaust passage at the upstream side of above-mentioned Exhaust gas purifying device with reducing agent;
Regeneration sector, it is that prearranging quatity is when above in savings amount of cleaning of substances in above-mentioned Exhaust gas purifying device, carry out Regeneration Treatment, by supplying with reducing agent and this reducing agent is imported above-mentioned Exhaust gas purifying device to exhaust, the purifying ability of above-mentioned Exhaust gas purifying device is regenerated in this Regeneration Treatment from above-mentioned reducing agent feed mechanism; And
Extraction flow control mechanism during regeneration, when it carries out above-mentioned Regeneration Treatment at above-mentioned regeneration sector, extraction flow control when regenerating, amount by the exhaust of passing through above-mentioned bypass passageways in the exhaust of above-mentioned exhaust passage is increased, and make amount minimizing by the exhaust of above-mentioned Exhaust gas purifying device;
Extraction flow control when determining whether carrying out above-mentioned regeneration based on following two amounts, that is discharge reduction that cleaning of substances when, having carried out above-mentioned regeneration when carrying out above-mentioned Regeneration Treatment under the situation of extraction flow control, that obtained by the rising of the purification ratio of above-mentioned Exhaust gas purifying device is discharged from above-mentioned Exhaust gas purifying device and the discharge increasing amount of discharging from above-mentioned bypass passageways by the cleaning of substances that the increase of the exhaust by above-mentioned bypass passageways causes.
2. the emission control system of internal-combustion engine as claimed in claim 1, it is characterized in that, also has cleaning of substances amount decision mechanism, what of the discharge increasing amount that this cleaning of substances amount decision mechanism is judged discharge reduction that cleaning of substances under the situation of extraction flow control when having carried out above-mentioned regeneration when carrying out above-mentioned Regeneration Treatment, that obtained by the rising of the purification ratio of above-mentioned Exhaust gas purifying device is discharged from above-mentioned Exhaust gas purifying device and the cleaning of substances that caused by the increase of the exhaust by above-mentioned bypass passageways is discharged from above-mentioned bypass passageways;
Under the situation of the discharge increasing amount that the cleaning of substances that discharge reduction that the cleaning of substances that utilizes above-mentioned cleaning of substances amount decision mechanism to be judged as to be obtained by the rising of the purification ratio of above-mentioned Exhaust gas purifying device is discharged from above-mentioned Exhaust gas purifying device causes more than the increase by the exhaust by above-mentioned bypass passageways is discharged from above-mentioned bypass passageways, extraction flow control when carrying out above-mentioned regeneration.
3. the emission control system of internal-combustion engine as claimed in claim 2, it is characterized in that, above-mentioned cleaning of substances amount decision mechanism carries out following judgement, that is, judge from above-mentioned Regeneration Treatment, begin to supply with reducing agent begin in next Regeneration Treatment to supply with reducing agent during in, discharge increasing amount that discharge reduction that the cleaning of substances that obtained by the rising of the purification ratio of above-mentioned Exhaust gas purifying device is discharged from above-mentioned Exhaust gas purifying device and the cleaning of substances that caused by the increase of the exhaust by above-mentioned bypass passageways are discharged from above-mentioned bypass passageways what.
4. the emission control system of internal-combustion engine as claimed in claim 1 is characterized in that, above-mentioned Exhaust gas purifying device is occlusion reduced form NO xCatalyzer;
This emission control system also has oxidation catalyst, and this oxidation catalyst is arranged at the downstream side of the interflow portion of exhaust passage in the above-mentioned exhaust passage, above-mentioned and above-mentioned bypass passageways, has oxidability;
Extraction flow control when determining whether carrying out above-mentioned regeneration based on following three amounts, that is, and NO when when carrying out above-mentioned Regeneration Treatment, having carried out above-mentioned regeneration under the situation of extraction flow control, that obtain by the rising of the purification ratio of above-mentioned Exhaust gas purifying device xThe discharge reduction of discharging from above-mentioned Exhaust gas purifying device, the NO that causes by the increase of the exhaust by above-mentioned bypass passageways xFrom the discharge increasing amount of above-mentioned bypass passageways discharge and the NH that discharges from above-mentioned Exhaust gas purifying device 3The NO that produces by above-mentioned oxidation catalyst oxidizes xIncreasing amount.
5. the emission control system of internal-combustion engine as claimed in claim 4 is characterized in that, also has NO xThe amount decision mechanism, it judges NO under the situation of extraction flow control when having carried out above-mentioned regeneration when carrying out above-mentioned Regeneration Treatment, that obtained by the rising of the purification ratio of above-mentioned Exhaust gas purifying device xThe discharge reduction of discharging from above-mentioned Exhaust gas purifying device, the NO that causes with increase by the exhaust by above-mentioned bypass passageways xFrom the discharge increasing amount of above-mentioned bypass passageways discharge and the NH that discharges from above-mentioned Exhaust gas purifying device 3The NO that produces by above-mentioned oxidation catalyst oxidizes xWhat of total amount of increasing amount;
Utilizing above-mentioned NO xThe amount decision mechanism is judged as the NO that is obtained by the rising of the purification ratio of above-mentioned Exhaust gas purifying device xThe NO that the discharge reduction of discharging from above-mentioned Exhaust gas purifying device causes more than the increase by the exhaust by above-mentioned bypass passageways xFrom the discharge increasing amount of above-mentioned bypass passageways discharge and the NH that discharges from above-mentioned Exhaust gas purifying device 3The NO that produces by above-mentioned oxidation catalyst oxidizes xThe situation of total amount of increasing amount under, extraction flow control when carrying out above-mentioned regeneration.
6. the emission control system of internal-combustion engine as claimed in claim 5 is characterized in that, above-mentioned NO xThe amount decision mechanism carries out following judgement, that is, judge from above-mentioned Regeneration Treatment, begin to supply with reducing agent begin in next Regeneration Treatment to supply with reducing agent during in, the NO that obtains by the rising of the purification ratio of above-mentioned Exhaust gas purifying device xThe discharge reduction of discharging from above-mentioned Exhaust gas purifying device, the NO that causes with increase by the exhaust by above-mentioned bypass passageways xFrom the discharge increasing amount of above-mentioned bypass passageways discharge and the NH that discharges from above-mentioned Exhaust gas purifying device 3The NO that produces by above-mentioned oxidation catalyst oxidizes xWhat of total amount of increasing amount.
CNA2008800023862A 2007-01-19 2008-01-21 Exhaust emission control system of internal combustion engine Pending CN101583781A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103184916A (en) * 2012-01-02 2013-07-03 福特环球技术公司 Internal combustion engine with exhaust-gas aftertreatment arrangement and method for operating an internal combustion engine of said type
CN103299040A (en) * 2011-01-12 2013-09-11 罗伯特·博世有限公司 Fluid tank comprising a filter system
CN108201749A (en) * 2016-12-17 2018-06-26 重庆市银盛模具有限公司 Handle the structure of exhaust gas
CN111868357A (en) * 2018-03-08 2020-10-30 五十铃自动车株式会社 Exhaust gas purification device, vehicle, and exhaust gas purification control device
CN115045739A (en) * 2022-05-16 2022-09-13 潍柴动力股份有限公司 Emission control method, control device and control system of marine diesel engine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103299040A (en) * 2011-01-12 2013-09-11 罗伯特·博世有限公司 Fluid tank comprising a filter system
CN103184916A (en) * 2012-01-02 2013-07-03 福特环球技术公司 Internal combustion engine with exhaust-gas aftertreatment arrangement and method for operating an internal combustion engine of said type
CN103184916B (en) * 2012-01-02 2018-01-16 福特环球技术公司 Internal combustion engine with exhaust aftertreatment equipment and the method for running the type internal combustion engine
CN108201749A (en) * 2016-12-17 2018-06-26 重庆市银盛模具有限公司 Handle the structure of exhaust gas
CN111868357A (en) * 2018-03-08 2020-10-30 五十铃自动车株式会社 Exhaust gas purification device, vehicle, and exhaust gas purification control device
CN115045739A (en) * 2022-05-16 2022-09-13 潍柴动力股份有限公司 Emission control method, control device and control system of marine diesel engine
CN115045739B (en) * 2022-05-16 2024-02-20 潍柴动力股份有限公司 Emission control method, emission control device and emission control system of marine diesel engine

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Open date: 20091118