WO2002090731A1 - Dispositif de regulation d'emission de gaz polluants - Google Patents
Dispositif de regulation d'emission de gaz polluants Download PDFInfo
- Publication number
- WO2002090731A1 WO2002090731A1 PCT/JP2002/001499 JP0201499W WO02090731A1 WO 2002090731 A1 WO2002090731 A1 WO 2002090731A1 JP 0201499 W JP0201499 W JP 0201499W WO 02090731 A1 WO02090731 A1 WO 02090731A1
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- WO
- WIPO (PCT)
- Prior art keywords
- particulate filter
- fine particles
- temperature
- fuel ratio
- exhaust gas
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- 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
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
- F01N2430/06—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by varying fuel-air ratio, e.g. by enriching fuel-air mixture
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0812—Particle filter loading
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
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- 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
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S55/00—Gas separation
- Y10S55/30—Exhaust treatment
Definitions
- the present invention relates to an exhaust gas purification device.
- a particulate filter is arranged in an engine exhaust passage to remove fine particles contained in the exhaust gas, and the particulate filter once collects fine particles in the exhaust gas. Then, the particulate filter is regenerated by igniting and burning the fine particles collected on the particulate filter. In this case, it takes a considerably high temperature and a considerable time to ignite and burn the collected fine particles.
- the air-fuel ratio in the known internal combustion engine carrying the NO x absorbent to release and reduce the absorbed NO x and the air-fuel ratio to absorb NO x in Li pitch in Patiki Yoo, single DOO on the filter when lean See Japanese Patent Application Laid-Open No. 6-159307.
- This normal engine under re Ichin air is operated in the internal combustion engine, air to amount of NO x is absorbed in the NO x absorbent is to release the NO x from exceeds an allowable value the NO x absorbent
- the fuel ratio is temporarily reset.
- the NO x absorbent from the NO x is released temperatures Patikyure bets filter by heat generated during the reduction of When reduced NO x increases. So back to again lean air-fuel ratio at the time of release completion of the NO x is one example of this internal combustion engine, finely deposited on Patikyure preparative filter by utilizing the fact that the temperature rises in this case Patikyure DOO filter They try to burn the particles.
- the air-fuel ratio is occasionally temporarily re Tutsi to release the NO x from the NO x absorbent, hence the change pattern of the air-fuel ratio is similar to the present invention.
- absorption of NO x of the NO x absorbent in this known internal combustion engine air-fuel ratio when exceeding the permissible amount is temporarily re Tutsi, fine particles hardly oxidized deposited in the present invention
- the air-fuel ratio is temporarily switched when the temperature rises, and not only does the purpose of refilling the air-fuel ratio differ, but the timing of refilling also differs. That is, it is impossible to NO x keep always varied favorably not Chasse oxidation state microparticles also deposited in the re Tutsi Thailand Mi ring that release from the NO x absorbent. Disclosure of the invention
- An object of the present invention is to provide an exhaust gas purifying apparatus that can burn fine particles deposited on a particulate filter in a short time.
- a particulate filter for collecting and removing fine particles in exhaust gas is disposed in an engine exhaust passage, and combustion is continuously performed under a lean air-fuel ratio.
- the prediction means for predicting whether or not the properties of the fine particles deposited on the particulate filter have changed to a property that is less likely to be oxidized than immediately after the deposition, and the properties of the fine particles deposited on the particulate filter When it is predicted that the property has changed to a property that is less likely to be oxidized than immediately after, the property of the fine particles deposited on the particulate filter is changed to the oxidizing property.
- Air-fuel ratio switching means for temporarily switching the air-fuel ratio of the exhaust gas flowing into the particulate filter from lean to rich in order to change the particulate filter, and whether the accumulated amount of particulates on the particulate filter exceeds a predetermined amount.
- a determination means for determining whether or not the air-fuel ratio of the particulate filter on the particulate filter exceeds a predetermined amount.
- a particulate filter for collecting and removing fine particles in exhaust gas is disposed in an engine exhaust passage, and combustion is continuously performed under a lean air-fuel ratio.
- Air-fuel ratio switching means for temporarily switching the air-fuel ratio from lean to rich, and accumulation of particulates on the particulate filter
- a second determination means for determining whether the amount of particulates exceeds a predetermined amount, and a method for determining whether particulates accumulated on the particulate filter when the amount of particulates deposited on the particulate filter exceeds a predetermined amount.
- an exhaust gas purifying apparatus provided with a temperature control means for raising the temperature of the particulate filter under a lean air-fuel ratio in order to oxidize and remove the exhaust gas.
- fine particles in the exhaust gas are contained in the engine exhaust passage.
- the air-fuel ratio of exhaust gas flowing into the particulate filter is temporarily reduced.
- Air-fuel ratio switching means capable of switching from lean to rich, a determination means for determining whether or not the accumulation amount of fine particles on the particulate filter has exceeded a predetermined amount; When the accumulation amount of fine particles in the particulate filter exceeds a predetermined amount, the air-fuel ratio of the exhaust gas flowing into the particulate filter is changed in order to change the property of the fine particles deposited on the particulate filter to the property of oxidizing and screening. After temporarily switching from lean to rich, in order to oxidize and remove fine particles deposited on the patiti filter.
- Lean air-fuel ratio exhaust gas purification apparatus and a temperature control means for raising the temperature of Patikiyu, single preparative filter under is provided.
- Fig. 1 is an overall view of an internal combustion engine
- Figs. 2A and 2B are diagrams showing a particulate filter
- Figs. 3A and 3B are diagrams showing changes in the oxidizing properties of fine particles
- Fig. 4 is an example of operation control.
- Fig. 5 shows another example of operation control
- Fig. 6 is a diagram for explaining injection control
- Fig. 7 is a diagram showing the amount of decrease in particulate oxidizability
- Fig. 8 is for controlling engine operation
- Fig. 9 shows the relationship between the amount of particulates that can be removed by oxidation and the temperature of the particulate filter.
- Fig. 10 is a diagram for explaining the state of deposited particulates.
- Figs. 10 is a diagram for explaining the state of deposited particulates.
- FIGS. 11A and 11B are Figures for explaining the state of the deposited fine particles
- FIGS. 12A and 12B are figures for explaining the state of the deposited fine particles
- FIG. 13 is a view showing the time ⁇ t
- FIGS. 14A and 14B Fig. 15 and 16 show flow charts for controlling engine operation
- Figs. 17A, 17B and 17C illustrate changes in pressure drop.
- Luck figures FIG 1 8 institution for 19A, 19B, and 19C are diagrams for explaining changes in pressure loss
- FIG. 20 is a flowchart for controlling operation of the engine. 1 is a flow chart for controlling the operation of the engine
- FIG. 22 is a diagram showing the amount of generated smoke
- FIGS. 23A and 23B are diagrams showing the operating range of the engine
- Fig. 25 shows the relationship between the amount of fine particles that can be removed by oxidation and the temperature of the particulate filter
- Fig. 26 shows the amount of accumulated particulates
- Fig. 27 shows the engine Flowchart for controlling operation
- Fig. 28 is a flowchart for controlling the operation of the engine
- Figs. 29A and 29B are diagrams showing maps of set values
- etc. etc.
- Fig. 30 is a diagram of the engine. This is a flowchart for controlling operation.
- FIG. 1 shows a case where the present invention is applied to a compression ignition type internal combustion engine.
- the present invention can also be applied to a spark ignition type internal combustion engine.
- 1 is the engine body
- 2 is the cylinder block
- 3 is the cylinder head
- 4 is the piston
- 5 is the combustion chamber
- 6 is the electrically controlled fuel injection valve
- 7 is the intake valve
- 8 Indicates an intake port
- 9 indicates an exhaust valve
- 10 indicates an exhaust port.
- the intake port 8 is connected to the surge tank 12 via the corresponding intake branch pipe 11
- the surge tank 12 is connected to the compressor 15 of the exhaust turbocharger 14 via the intake duct 13.
- a throttle valve 17 driven by a step motor 16 is arranged in the intake duct 13, and further cools the intake air flowing through the intake duct 13 around the intake duct 13.
- a cooling device 18 for cooling is provided.
- the engine cooling water is guided into the cooling device 18 and the intake air is cooled by the engine cooling water.
- the exhaust port 10 is exhausted through the exhaust manifold 19 and the exhaust pipe 20.
- the exhaust turbine 21 of the charger 14 is connected to an exhaust turbine 21, and the outlet of the exhaust turbine 21 is connected to a casing 23 containing a particulate filter 22.
- the exhaust manifold 19 and the surge tank 12 are connected to each other via an exhaust gas recirculation (hereinafter referred to as EGR) passage 24, and an electrically controlled EGR control valve 25 is disposed in the EGR passage 24. Is done.
- a cooling device 26 for cooling the EGR gas flowing in the EGR passage 24 is disposed around the EGR passage 24. In the embodiment shown in FIG. 1, the engine cooling water is guided into the cooling device 26, and the engine cooling water cools the EGR gas.
- each fuel injection valve 6 is connected to a fuel reservoir, a so-called common rail 27, via a fuel supply pipe 6a.
- Fuel is supplied to the common rail 27 from an electric control type variable discharge fuel pump 28, and the fuel supplied to the common rail 27 is supplied to the fuel injection valve 6 via each fuel supply pipe 6a. Supplied to A fuel pressure sensor 29 for detecting the fuel pressure in the common rail 27 is attached to the common rail 27, and the fuel pressure in the common rail 27 is set to the target fuel pressure based on the output signal of the fuel pressure sensor 29. The discharge amount of the fuel pump 28 is controlled so that
- the electronic control unit 30 is composed of a digital computer, and a ROM (Read Only Memory) 32, a RAM (Random Access Memory) 33, and a CPU (Micro Computer) are connected to each other by a bidirectional bus 31. 3), input port 35 and output port 36.
- the output signal of the fuel pressure sensor 29 is input to the input port 35 via the corresponding AD converter 37.
- a temperature sensor 39 for detecting the temperature of the particulate filter 22 is attached to the particulate filter 22, and an output signal of the temperature sensor 39 is supplied to a corresponding AD converter 37. Input to input port 35.
- the particulate filter 22 has a pressure sensor for detecting a pressure difference between the exhaust gas pressure on the upstream side and the exhaust gas pressure on the downstream side of the particulate filter 22, that is, a pressure loss in the particulate filter 22.
- the output signal of the pressure sensor 43 is input to the input port 35 through the corresponding AD converter 37.
- a load sensor 41 that generates an output voltage proportional to the amount of depression L of the accelerator pedal 40 is connected to the accelerator pedal 40, and the output voltage of the load sensor 41 is passed through a corresponding AD converter 37. Input to input port 35. Further, a crank angle sensor 42 that generates an output pulse every time the crank shaft rotates, for example, 30 ° is connected to the input port 35.
- the output port 36 is connected to the fuel injection valve 6, the step motor 16 for driving the throttle valve, the E0 control valve 25, and the fuel pump 28 via the corresponding drive circuit 38. .
- Figures 2A and 2B show the structure of the particulate filter 22.
- 2A shows a front view of the particulate filter 22
- FIG. 2B shows a side sectional view of the particulate filter 22.
- the particulate filter 22 has a honeycomb structure and includes a plurality of exhaust passages 50 and 51 extending parallel to each other. These exhaust passages are plugged at the downstream end.
- the exhaust gas inflow passage 50 closed by 52 and an exhaust gas outflow passage 51 whose upstream end is closed by a plug 53.
- the hatched portion in FIG. 2A indicates the plug 53. Therefore, the exhaust gas inflow passages 50 and the exhaust gas outflow passages 51 are alternately arranged via the thin partition walls 54.
- the exhaust gas inflow passage 50 and the exhaust gas outflow passage 51 are each surrounded by four exhaust gas outflow passages 51, and each exhaust gas outflow passage 51 is formed by four exhaust gas outflow passages. Arranged to be surrounded by the inflow passage 50 It is.
- the particulate filter 22 is made of a porous material such as cordierite, so that the exhaust gas that has flowed into the exhaust gas inflow passage 50 is surrounded by a partition wall as shown by an arrow in FIG. 2B. The exhaust gas flows out into the adjacent exhaust gas outflow passage 51 through the inside 54.
- each exhaust gas inflow passage 50 and each exhaust gas outflow passage 51 that is, pores on both surfaces of each partition wall 54 and in the partition wall 54.
- a support layer made of, for example, alumina is formed on the inner wall surface, and a noble metal catalyst such as platinum Pt or a rare earth catalyst such as cerium Ce is supported on the support.
- a noble metal catalyst such as platinum Pt or a rare earth catalyst such as cerium Ce is supported on the support.
- Fine particles mainly composed of carbon solids contained in the exhaust gas are collected and deposited on the particulate filter 22.
- the fine particles deposited on the particulate filter 22 are sequentially oxidized in about 30 seconds to 1 hour, and therefore, the fine particles are always deposited on the particulate filter 22.
- the temperature of the particulate filter 22 is maintained at a temperature at which the particulates can be oxidized, for example, at 250 ° C. or higher, the particulates sent to the particulate filter 22 per unit time are not so large. Some are oxidized, so that in this case all the particulates are continuously oxidized.
- the amount of fine particles sent into the particulate filter 22 per unit time increases, or if the temperature of the particulate filter 22 decreases, the amount of fine particles that are not sufficiently oxidized increases, so that the amount of fine particles on the particulate filter 22 increases.
- the amount of deposited fine particles increases. In the actual operation state, it is sent to the particulate filter 22 for a unit time. In some cases, the amount of fine particles entering the filter may increase, and the temperature of the particulate filter 22 may decrease, so that the amount of fine particles deposited on the particulate filter 22 gradually increases.
- AZF indicates the air-fuel ratio of the exhaust gas flowing into the particulate filter 22.
- the ratio between the air and the fuel supplied into the exhaust passage upstream of the intake passage, the combustion chamber 5 and the particulate filter 22 is referred to as the air-fuel ratio of the exhaust gas.
- the solid line X indicates when the temperature of the particulate filter 22 is relatively low
- the dashed line X 2 indicates when the temperature of the particulate filter 22 is high.
- a large number of pores or voids are formed in the lump of the deposited fine particles, and thus the surface area S and the fine particles in the lump of the fine particles are formed.
- the ratio of the volume to the mass V of the mass that is, the surface area volume ratio S / V, is a considerably large value.
- a large surface area volume ratio SZV means that the contact area between the fine particles and oxygen is large, and thus indicates that the fine particles have good oxidizing properties.
- the air-fuel ratio AZF when the air-fuel ratio AZF is rich, the oxidizability of the fine particles is improved.Therefore, when the combustion is continuously performed under the lean air-fuel ratio, if the air-fuel ratio AZF is sometimes rich, the fine particles are finely oxidized. Can be maintained in an easily oxidizable state.
- FIGS. 4 and 5 show the basic concept of operation control according to the present invention. Note that in FIGS. 4 and 5, TF indicates the temperature of the paticular filter 22.
- the air-fuel ratio AZF is temporarily switched to rich, and the air-fuel ratio is reduced to rich.
- the oxidizing property of the fine particles is enhanced.
- the temperature of the pasty filter 22 is raised to 600 ° C. or more while maintaining the lean air-fuel ratio. Temperature and then maintain it at 600 ° C. or higher.
- the temperature rise control is performed, the fine particles deposited on the particulate filter 22 are ignited and burned.
- Air-fuel ratio switching means for temporarily switching the air-fuel ratio AZF of the exhaust gas flowing into the particulate filter 22 to change from lean to rich in order to change the air-fuel ratio to an easily oxidizable property, and a particulate filter
- a determination means for determining whether or not the amount of fine particles deposited on 22 exceeds a predetermined amount UL; and a method for determining the amount of fine particles deposited on the particulate filter 22 by a predetermined amount UL. Is exceeded, the temperature of the particulate filter 22 is increased under a lean air-fuel ratio in order to oxidize and remove the fine particles deposited on the particulate filter 22.
- temperature control means for increasing the pressure.
- an electric heater is arranged at the upstream end of the particulate filter 22 and the exhaust gas flowing into the particulate filter 22 or the particulate filter 22 is added by the electric heater.
- a method of heating, a method of heating the particulate filter 22 by injecting fuel into the exhaust passage upstream of the particulate filter 22 and burning the fuel, and a method of increasing the temperature of exhaust gas to increase the temperature of the particulate filter 22 One way is to raise the temperature of the filter 22.
- One of the effective methods for raising the exhaust gas temperature is to retard the fuel injection timing until after the compression top dead center. That is, normally the main fuel Q m is Ru is injected near compression top dead center as shown in in FIG. 6 (I). In this case, the main period afterburning the injection time period is retarded fuel Q n becomes longer, as shown in (II) of FIG. 6, the exhaust gas temperature rises in the upper and thus. As the exhaust gas temperature increases, the temperature TF of the particulate filter 22 increases accordingly.
- auxiliary fuel Q v In addition to I urchin main fuel Q m as shown in (III) of FIG. 6 in order to raise the exhaust gas temperature can be morphism injection of auxiliary fuel Q v near intake top dead center.
- auxiliary fuel Q p In addition to I urchin main fuel Q n shown in (IV) of FIG. 6, it is also possible to inject auxiliary fuel Q p during in extent inflation line or the exhaust stroke. That is, in this case, the auxiliary fuel Q p most is discharged into the exhaust passage in the form of unburned HC without being burned. This unburned HC is oxidized by excess oxygen on the particulate filter 22, and the temperature TF of the particulate filter 22 is raised by the oxidation reaction heat generated at this time.
- the air-fuel ratio AZF is temporarily switched to rich, and the oxidizing property of the fine particles is increased each time the air-fuel ratio is rich.
- the air-fuel ratio A / F temporarily changes from lean to rich to increase the oxidizing properties of the particulates. Is switched. Then, while maintaining the lean air-fuel ratio, the temperature of the particulate filter 22 is raised to 600 ° C. or higher, and thereafter, temperature raising control is performed to maintain the temperature at 600 ° C. or higher.
- the burning time of the deposited fine particles is further reduced.
- Either the method shown in FIG. 4 or the method shown in FIG. 5 can be used for the operation control.However, in the embodiment described below, the case where the method shown in FIG. 5 is used is described as an example. I have. Next, each embodiment will be described sequentially. 7 and 8 show a first embodiment. In this embodiment, the amount of decrease or increase in the oxidizing property of the fine particles deposited on the particulate filter 22 per unit time is calculated, and based on the decrease * or the increase amount of the oxidative property, the particulate filter 22 is calculated. Judgment is made as to whether or not the properties of the fine particles deposited on top have changed to a property that is more difficult to oxidize than immediately after deposition.
- the amount of decrease ADEO in the oxidizing property per unit time of the fine particles can be represented as shown in FIG. That is, when the air-fuel ratio AZF is lean, as shown by the solid line L, the decrease amount A DEO of the oxidizing property of the fine particles increases as the temperature TF of the particulate filter 22 increases.
- the air-fuel ratio A / F is rich, as shown by the solid line R, the amount of decrease in the oxidizing property of the fine particles ⁇ DEO becomes negative, and the absolute value of the amount of decrease ADEO, that is, the unit time per unit time of the oxidizing property of the fine particles, The increase increases as the temperature TF of the particulate filter 22 increases.
- the amount of decrease in fine particle oxidizability ADEO shown in FIG. 7 is calculated for each unit time, and the calculated decrease in amount ADEO is integrated to determine the amount of decrease in fine particle oxidizability.
- the air-fuel ratio A / F is temporarily switched when the reduction amount of the oxidizing property of the fine particles exceeds the allowable limit XO corresponding to LL in FIG.
- FIG. 8 shows a flowchart for executing the first embodiment. Referring to FIG. 8, first, in step 100, based on FIG. The calculated amount of decrease in the oxidizing property of the fine particles ⁇ DEO is added to the DEO, and thus this DEO represents the amount of decrease in the oxidizing properties of the fine particles.
- the temperature T at which the amount of decrease in the oxidizing property of the fine particles exceeds the allowable limit XO and the temperature TF of the particulate filter 22 can oxidize the fine particles. For example, it is determined whether the temperature is higher than 250 ° C. DEO x XO or TF ⁇ T. In the case of, the routine proceeds to step 102 and normal operation is performed. At this time, combustion is continuously performed based on the lean air-fuel ratio. Next, the routine proceeds to step 105.
- step 101 D E O ⁇ X O and TF> T. If it is determined that the air-fuel ratio AZF has been determined, the air-fuel ratio AZF is temporarily subjected to a rich process to perform a rich process, whereby the oxidizing properties of the fine particles are recovered. Note that even if D E O ⁇ X O, T F ⁇ T. At this time, the rich processing is not performed. Next, in step 104, DEO is cleared. Next, the routine proceeds to step 105.
- step 105 it is determined whether or not the accumulation amount of the fine particles on the particulate filter 22 has exceeded a predetermined amount, that is, the pressure loss PD in the particulate filter 22 detected by the pressure sensor 43. It is determined whether the permissible limit PDX corresponding to UL of 5 has been exceeded. ? If 0>? 0, the routine proceeds to step 106, where a rich processing for temporarily raising the air-fuel ratio AZF is performed, thereby recovering the oxidizing properties of the fine particles. When this rich processing is completed, the routine proceeds to step 107, where the temperature TF of the particulate filter 22 is raised to 600 ° C. or more under the lean air-fuel ratio and 600 ° C.
- Temperature rise control is performed to maintain the temperature at or above ° C, whereby fine particles deposited on the particulate filter 22 are burned.
- the temperature raising control is stopped, and the normal operation is performed again.
- 9 to 16 show a second embodiment.
- the amount of the particles having the lowest oxidizing property among the particles deposited on the particulate filter 22 is calculated using a model, and the amount of the particles having the lowest oxidizing property is determined by a predetermined amount. It is determined that the properties of the fine particles deposited on the particulate filter 22 have changed to a property that is less likely to be oxidized than immediately after the deposition when the pressure exceeds the threshold.
- the solid line Z in FIG. 9 indicates the oxidation rate of the fine particles on the particulate filter 22, that is, for example, the amount G (g / min) of fine particles that can be oxidized and removed per minute and the particulate matter.
- the relationship with the temperature TF of the filter 22 is shown. That is, in FIG. 9, curve Z indicates a balance point at which the amount of fine particles flowing into the particulate filter 22 matches the amount G of fine particles that can be oxidized and removed. At this time, since the amount of the inflowing fine particles is equal to the amount of the fine particles to be oxidized and removed, the amount of the deposited fine particles on the particulate filter 22 is kept constant.
- the amount of deposited particles is smaller because the amount of inflowing particles is smaller than the amount of particles that can be removed by oxidation, and in region II of Fig. 9, the amount of inflowing particles is larger than the amount of particles that can be removed by oxidation. Therefore, the amount of deposited fine particles increases.
- FIG. 10 schematically shows a model of the state of the deposited fine particles when the amount of the inflowing fine particles coincides with the amount of fine particles G that can be removed by oxidation.
- numbers 1 to 5 arranged along the horizontal axis indicate the oxidizing property of the deposited fine particles, and the oxidizing property becomes worse toward the numbers 1 to 5.
- Wl, W2, W3, W4, and W5 indicate the amount of fine particles deposited at a certain time and having oxidizing properties of 1, 2, 3, 4, and 5, respectively.
- WOl, WO2, WO3, WO4, and WO5 indicate the amount of fine particles oxidized and removed after a certain period of time, and WR1, WR2, WR3, WR4, and WR5 still remain at this time. Fine particles that have accumulated Indicates the amount.
- the fine particles W1 flowing into the particulate filter 22 are oxidized and removed only by WO1 for a certain period of time, so that only WR1 remains, and the fine particles WR1 have low oxidizability from 1 to 2.
- the remaining fine particles W 2 are oxidized and removed only by WO 2 during a certain period of time, so that only fine particles of WR 2 remain, and it is thought that the fine particles WR 2 decrease the oxidizing property from 2 to 3. .
- W 2 matches W R 1
- W 3 matches W R 2
- W 4 matches WR 3
- W 5 matches WR 4.
- the ratio of 3, the ratio of WO4 to W4, and the ratio of WO5 to W5 are smaller than those shown in FIG.
- the amount of residual fine particles WR 1, WR 2, WR 3, W R4 and WR5 increase compared to the case shown in Fig.10. If such a state continues, the amount W5 of fine particles having oxidizability of 5 greatly increases as shown in FIG. 11B.
- FIGS. 12A and 12B show the case where the balance point between the amount of the inflowing fine particles and the amount G of the fine particles that can be removed by oxidation is point A and point B in FIG. 9, respectively.
- Figures 12A and 12B show the state of fine particles as in Figure 10, but in Figures 12A and 12B, the horizontal axis represents time. That is, in FIG. 12A, the abscissa indicates the time of 5 minutes, 10 minutes, 15 minutes, 20 minutes, and 25 minutes after the inflow of the fine particles, respectively.
- the abscissa axis shows the values 2, 4, 6, 8, and 10 minutes after the flow of the fine particles, respectively.
- the amount of fine particles G that can be removed by oxidation is larger than that at point A, so the amount of fine particles W1 in Fig. 12B is larger than the amount of fine particles W1 in Fig. 12A.
- point B in FIG. 9 has a higher temperature TF of the particulate filter 22 than point A, so that the oxidizability of the fine particles is reduced earlier. Nevertheless, the fact that the fine particles are oxidized and removed before the oxidizing property reaches 5 means that the fine particles are oxidized and removed early as shown in Fig. 12B.
- the time t required for 60% of the fine particles W1 to be oxidized and removed or the time ⁇ t required for 57% of the fine particles W2 to be oxidized and removed is 5 minutes in FIG. This is 2 minutes in Fig. 12B.
- this time ⁇ t is calculated as shown in FIG. As the temperature TF of the first filter 22 becomes higher, the temperature becomes shorter.
- the residual particle amounts WR 1, WR 2, WR 3, WR 4, and WR 5 are calculated, and the residual particle amount WR 5 is an allowable limit WR corresponding to LL in FIG.
- the air-fuel ratio AF is temporarily set to rich when X is exceeded.
- the amount of inflow fine particles that is, the amount of fine particles discharged from the engine.
- the amount of emitted particulates varies depending on the engine type, but when the engine type is determined, it becomes a function of the required torque TQ and the engine speed N.
- 1 4 A shows the amount M of discharged particulate of the internal combustion engine Ru shown in FIG. 1, each curve Mi, ⁇ 2, M 3, M 4, M 5 is equal discharged particulate amount ⁇ M 2 ⁇ M 3 ⁇ M 4 ⁇ M 5 ).
- the amount M of discharged particulate increases as the required torque TQ increases.
- the amount M of discharged particulate shown in FIG. 14A is stored in advance in the ROM 32 as a function of the required torque TQ and the engine speed N in the form of a map shown in FIG. 14B.
- FIGS. 15 and 16 show flowcharts for executing the second embodiment.
- step 200 the time ⁇ t is calculated from the relationship shown in FIG.
- step 201 the integrated amount ⁇ ⁇ ⁇ ⁇ during the ⁇ t time of the amount M of discharged particulate shown in FIG. 14B is calculated.
- step 202 the integrated amount ⁇ G of the amount G of oxidation-removable fine particles shown in FIG. 9 at the time ⁇ t is calculated.
- step 203 it is determined whether the ⁇ t time has elapsed. When the time ⁇ t has elapsed, the process proceeds to step 204.
- step 205 the residual particle amounts WR5, WR4, WR3, WR2, WR1 are calculated based on the following equation.
- step 206 the temperature T at which the residual particle amount WR5 becomes larger than the allowable limit WRX and the temperature TF of the particulate filter 22 can oxidize the particles. For example, it is determined whether the temperature is higher than 250 ° C. WR 5 WR X or T F ⁇ T. In the case of, the routine proceeds to step 207 and normal operation is performed. At this time, combustion is continuously performed under the lean air-fuel ratio. Next, the routine proceeds to step 210.
- step 206 WR 5> WR X and TF> T. If it is determined that the air-fuel ratio is higher than the predetermined value, the process proceeds to step 208 to perform a rich process for temporarily increasing the air-fuel ratio A / F, thereby recovering the oxidizing properties of the fine particles. Note that even if WR 5> WR X, T F ⁇ T. In this case, no rich processing is performed. Next, in step 209, initialization is performed. Next, the routine proceeds to step 210.
- step 210 it is determined whether or not the amount of fine particles deposited on the particulate filter 22 has exceeded a predetermined amount, that is, the pressure loss PD in the particulate filter 22 detected by the pressure sensor 43. Is determined to have exceeded the allowable limit PDX corresponding to UL in FIG. If PD> PDX, go to step 2 A litz treatment for temporarily refilling the ZF is performed, thereby recovering the oxidizing properties of the fine particles.
- the process proceeds to step 212, where the temperature TF of the particulate filter 22 is raised to 600 ° C or more and maintained at 600 ° C or more under a lean air-fuel ratio.
- the temperature rise control is performed so that the fine particles deposited on the particulate filter 22 are burned. When the regeneration of the patikilet filter 22 is completed, the temperature rise control is stopped, and the normal operation is performed again.
- FIGS. 17A, 17B, 17C and FIG. 18 show a third embodiment.
- the pressure loss in the particulate filter 22 is estimated on the one hand, and the actual pressure loss in the particulate filter 22 is detected on the other hand, and the particulate filter is determined from the difference between the estimated pressure loss and the actual pressure loss. It is determined whether or not the properties of the fine particles deposited on 22 have changed to a property that is less likely to be oxidized than immediately after the deposition. That is, when the oxidizing property of the fine particles is reduced, the fine particles are deposited without being sufficiently oxidized, and the pressure loss in the particulate filter 22 increases. Therefore, it can be determined from this whether or not the oxidizing property of the fine particles has decreased.
- the accumulated amount ⁇ WR of the fine particles is calculated from the discharged fine particle amount M and the oxidizable and removable fine particle amount G.
- Fig. 17A shows the relationship between the accumulated amount of fine particles ⁇ WR and the pressure loss ⁇ PD in the reference state. Therefore, when the accumulated amount of fine particles ⁇ WR is found, the pressure loss ⁇ PD in the standard state is obtained from the relationship shown in Fig. 17A. Is found.
- the correction coefficient K for the pressure loss APD is stored in the ROM 32 in advance in the form of a map, as shown in Fig. 17 ⁇ , and is calculated by multiplying the pressure loss PD by the correction coefficient ⁇ .
- the pressure drop PDD is calculated in accordance with the temperature TF of the filter 2 and the exhaust gas amount GE.
- the actual pressure loss PD detected by the pressure sensor 43 becomes higher than the pressure loss PDD calculated as shown in FIG. 17C.
- the air-fuel ratio AZF is temporarily reset.
- FIG. 18 shows a flowchart for executing the third embodiment.
- step 300 the amount of discharged particulates ⁇ ⁇ is calculated from the map shown in FIG. 14 ⁇ , and the amount G of oxidizable and removable particulates is calculated from the relationship shown in FIG. 9.
- step 302 ⁇ WR is set to WR.
- step 303 it is determined whether or not a predetermined time has elapsed. If the fixed time has not elapsed, the routine jumps to step 304, and if the fixed time has elapsed, the routine proceeds to step 304.
- step 304 the pressure loss APD is calculated from the relationship shown in Fig. 17A based on the amount of accumulated particulates ⁇ WR, and the estimated value PDD of the pressure loss is calculated from the pressure loss APD and the correction coefficient K shown in Fig. 17B. You.
- step 305 the pressure loss difference (PD-PDD) between the actual pressure loss PD detected by the pressure sensor 43 and the estimated value of the pressure loss PDD is larger than the installation value PX and the particulate filter 22 Temperature Temperature at which TF can oxidize fine particles Degree T. For example, it is determined whether the temperature is higher than 250 ° C.
- step 306 normal operation is performed. At this time, combustion is continuously performed under the lean air-fuel ratio.
- step 305 P D —P DD> P X and TF> T.
- the air-fuel ratio A / F is temporarily subjected to rich processing, thereby recovering the oxidizing properties of the fine particles. Note that T F ⁇ T even if P D-P D D> P X. In this case, no rich processing is performed.
- the routine proceeds to step 308.
- step 308 it is determined whether or not the accumulation amount of fine particles on the particulate filter 22 has exceeded a predetermined amount, that is, the pressure loss PD in the particulate filter 22 detected by the pressure sensor 43. It is determined whether the permissible limit PDX corresponding to UL of 5 has been exceeded. In the case of PD> PDX, the routine proceeds to step 309, where a rich processing for temporarily raising the air-fuel ratio A / F is performed, thereby recovering the oxidizing property of the fine particles. When this rich processing is completed, the routine proceeds to step 310, where the temperature TF of the particulate filter 22 is raised to 600 ° C. or more and 600 ° C. or more under a lean air-fuel ratio. The maintained temperature rise control is performed, whereby the fine particles deposited on the particulate filter 22 are burned. When the regeneration of the particulate filter 22 is completed, the temperature raising control is stopped, and the normal operation is performed again.
- a predetermined amount that is, the pressure loss PD in the particul
- FIGS. 19A, 19B, 19C and FIG. 20 show a fourth embodiment.
- the temperature TF of the particulate filter 22 is temporarily raised to about 450 ° C. to oxidize some of the deposited fine particles. Determine if it has fallen I have to. That is, when the temperature TF of the particulate filter 22 is increased, a large amount of deposited fine particles is oxidized when the oxidizing property of the fine particles is high, but the deposited fine particles are hardly oxidized when the oxidizing property of the fine particles is low. Therefore, the pressure loss after raising the temperature TF of the particulate filter 22 is low when the oxidizability of the particles is high, as shown by PDD in Fig.
- the temperature rise control of the particulate filter 22 is performed. .
- the target value PDT is previously stored in the ROM 32 as a function of the required torque TQ and the engine speed N as shown in FIG. 19B.
- the actual pressure loss P D is compared with the pressure loss P D D when the oxidizing property of the fine particles is high.
- This pressure loss PDD is obtained in advance through experiments and the like, and this pressure loss PDD is stored in advance in ROM 32 as a function of the required torque TQ and the engine speed N as shown in Fig. 19C. Have been.
- the pressure loss difference (PD-PDD) exceeds the set value PXX, the air-fuel ratio A / F is temporarily reset.
- FIG. 20 shows a flowchart for executing the fourth embodiment.
- PD-1 between the actual pressure PD detected by the pressure sensor 43 and the pressure drop PDD obtained from the map shown in FIG. PDD
- step 404 normal operation is performed. At this time, combustion is continuously performed under the lean air-fuel ratio.
- step 4003 PD_PDD> PXX and TF> T.
- step 405 a rich process is performed to temporarily make the air-fuel ratio A / F rich, thereby recovering the oxidizing property of the fine particles.
- T F ⁇ T even if P D — P D D> P X X. In this case, no rich processing is performed. Then proceed to step 406.
- step 406 it is determined whether or not the amount of the fine particles deposited on the particulate filter 22 has exceeded a predetermined amount, that is, the pressure loss in the particulate filter 22 detected by the pressure sensor 43. It is determined whether the PD has exceeded the allowable limit PDX corresponding to UL in FIG. In the case of PD> PDX, the process proceeds to step 407 to perform a rich process for temporarily increasing the air-fuel ratio A / F, thereby recovering the oxidizing properties of the fine particles. When this refilling process is completed, the routine proceeds to step 408, where the temperature TF of the particulate filter 22 is raised to 600 ° C or more and 600 ° C based on the lean air-fuel ratio. Keep above C The temperature rise control is performed so that the fine particles deposited on the particulate filter 22 are burned. When the regeneration of the particulate filter 22 is completed, the temperature raising control is stopped, and the normal operation is performed again.
- a predetermined amount that is, the pressure loss in the particulate filter 22 detected by
- the fine particles are exposed to a high temperature for a long time under a lean air-fuel ratio, and thus the oxidizing properties of the fine particles decrease. Therefore, when the engine is started or when the high-speed operation is continued for a predetermined time or more, it can be predicted that the property of the fine particles deposited on the particulate filter 22 has changed to a property that is less likely to be oxidized than immediately after the deposition.
- FIG. 21 shows a flowchart for carrying out the fifth embodiment.
- the routine proceeds to step 501 and normal operation is performed. At this time, combustion is continuously performed under the lean air-fuel ratio. Next, the routine proceeds to step 503.
- the routine proceeds to step 502, where a litz process for temporarily raising the air-fuel ratio A / F is performed, thereby recovering the oxidizing properties of the fine particles. Note that even if it can be predicted that the properties of the fine particles deposited on the particulate filter 22 have changed to a property that is less likely to be oxidized than immediately after deposition, TF ⁇ T. In the case of, the rich processing is not performed. Next, the routine proceeds to step 503.
- step 503 it is determined whether or not the accumulation amount of the fine particles on the particulate filter 22 has exceeded a predetermined amount, that is, whether or not the particulate filter 22 has been detected by the pressure sensor 43. It is determined whether the pressure loss PD has exceeded the allowable limit PDX corresponding to UL in Fig. 5.
- the routine proceeds to step 504, where a rich process for temporarily making the air-fuel ratio A / F rich is performed, thereby recovering the oxidizing properties of the fine particles.
- the process proceeds to step 505, and based on the lean air-fuel ratio, the particulate filter 2
- the temperature raising control is performed to raise the temperature TF of step 2 to 600 ° C. or more and maintain it at 600 ° C. or more, whereby the fine particles deposited on the particulate filter 22 are burned.
- the temperature rise control is stopped, and the normal operation power is again performed.
- the EGR gas rate is set to 55% or more, the generation of smoke does not occur because the endothermic effect of the EGR gas does not increase the temperature of the fuel and the surrounding gas during combustion, that is, low-temperature combustion. Is performed, and as a result, hydrocarbons do not grow to soot.
- This low temperature combustion has the feature that it is a child reduced generation amount of the NO x while suppressing the generation of smoke regardless of the air-fuel ratio. That is, if the air-fuel ratio is made rich, the fuel becomes excessive, but the combustion temperature is suppressed to a low temperature, so that the excess fuel does not grow into soot, thus producing smoke. Absent. In addition, only occur a small amount also extremely this time NO x. On the other hand, when the average air-fuel ratio is lean or when the air-fuel ratio is the stoichiometric air-fuel ratio, a small amount of soot is generated when the combustion temperature rises, but the combustion temperature is suppressed to a low temperature under low-temperature combustion.
- region I is an operation region in which the first combustion in which the amount of inert gas in the combustion chamber 5 is larger than the amount of inert gas in which the amount of soot generation reaches a peak, that is, low-temperature combustion, can be performed.
- region II the second combustion in which the amount of inert gas in the combustion chamber is smaller than the amount of inert gas at which the amount of soot generation peaks, that is, operation in which only normal combustion can be performed Indicates the area.
- Figure 23B shows the target air-fuel ratio when performing low-temperature combustion in operating region I.
- a / F is shown.
- Figure 24 shows the opening of the throttle valve 17, the opening of the EGR control valve 25, and the EGR rate according to the required torque TQ when performing low-temperature combustion in the operating region I. , Air-fuel ratio, injection start timing ⁇ S, injection completion timing 0 E, and injection quantity.
- FIG. 24 also shows the degree of opening of the throttle valve 17 during normal combustion performed in the operation region II.
- the air-fuel ratio in the combustion chamber 5 can be made rich without generating a large amount of soot, that is, a large amount of fine particles. Therefore, when the operating state of the engine is in the second operating region II shown in Fig. 23A, it is determined that the air-fuel ratio AZF to increase the oxidizing property of the particulates should be temporarily set to the rich state, or When predicted, the air-fuel ratio AZF is not increased until the operating state of the engine shifts to the first operating area I, and the air-fuel ratio A / F is set after the operating state of the engine shifts to the first operating area II. It is preferable to make a rich.
- FIGS. 25 to 30 show various embodiments in which no catalyst is carried on the particulate filter 22.
- the oxidation rate of the fine particles that is, the amount G of the particles that can be removed by oxidation, is 6 when the temperature TF of the particulate filter 22 is 6.
- the temperature rises sharply around 0 ° C, so that the temperature TF of the particulate filter 22 is almost 60
- the fine particles are deposited on the particulate filter 22 without being oxidized and removed.
- the temperature TF of the particulate filter 22 is usually considerably lower than 600 ° C. Therefore, if the particulate filter 22 that does not carry a catalyst is used, the temperature of the particulate filter 22 becomes higher. Fine particles will continue to accumulate on the surface.
- the air-fuel ratio A / F is set to increase the oxidizing property of the deposited fine particles. Sometimes it is necessary to temporarily refill.
- FIGS. 26 and 27 show a sixth embodiment suitable for a case where the particulate filter 22 does not carry a catalyst.
- FIG. 26 shows the accumulation amount W of the fine particles on the particulate filter 22.
- the meanings of the numerals and symbols in FIG. 26 are the same as those shown in FIG. If the particulate filter 22 does not carry a catalyst, all of the fine particles W 1 that have flowed in become the residual fine particles WR 1, and the fine particles WR 2, WR with poor oxidizability over time. It sequentially changes to 3, WR 4 and WR 5. Therefore, the amount WR5 of the worst oxidizing fine particles gradually increases. In this embodiment, when the residual fine particle amount WR5 exceeds the allowable limit WRXX, the air-fuel ratio AZF is temporarily increased in order to increase the oxidizing property of the fine particles.
- FIG. 27 shows a flowchart for carrying out the sixth embodiment.
- step 600 the respective residual particle amounts WR5, WR4, WR3, WR2, and WR1 are calculated based on the following equation.
- the above-mentioned M is the amount of discharged particulates calculated from the map of FIG. 14B.
- the temperature T at which the residual amount WR5 of the lowest oxidizing property exceeds the allowable limit WRXX and the temperature TF of the particulate filter 22 can oxidize the particles. For example, it is determined whether the temperature is higher than 250 ° C. W R 5 ⁇ W R XX or T F ⁇ T. At that time, the routine proceeds to step 62 and normal operation is performed. At this time, combustion is continuously performed based on the lean air-fuel ratio. Then, the process proceeds to step 605. On the other hand, in step 601, WR5> WRXX and TF> T.
- step 604 When it is determined that the air-fuel ratio A is not equal to the air-fuel ratio A / F, a rich process is performed to temporarily make the air-fuel ratio A / F rich, whereby the oxidizing property of the fine particles is recovered. T F ⁇ T even if WR 5> WR X X. In this case, no rich processing is performed. Next, in step 604, initialization is performed. Next, the routine proceeds to step 605.
- step 605 it is determined whether or not the accumulation amount of the fine particles on the particulate filter 22 exceeds a predetermined amount, that is, the pressure loss in the particulate filter 22 detected by the pressure sensor 43. It is determined whether the PD has exceeded the allowable limit PDX corresponding to UL in FIG. If PD> PDX, the routine proceeds to step 606, where a rich process for temporarily making the air-fuel ratio A / F rich is performed, thereby recovering the oxidizing properties of the fine particles.
- the routine proceeds to step 607, and based on the lean air-fuel ratio, the particulate filter 2
- the temperature increase control is performed to raise the temperature TF of step 2 to 600 ° C or more and maintain it at 600 ° C or more, thereby burning fine particles deposited on the particulate filter 22.
- the temperature raising control is stopped, and the normal operation is performed again.
- the air-fuel ratio AF is temporarily switched to a rich state when the integrated amount of the fine particles flowing into the particulate filter 22 exceeds the set amount MX.
- FIG. 28 shows a flowchart for carrying out the seventh embodiment.
- step 700 the amount M of protruding particles calculated from the map shown in FIG. 14B is added to ⁇ M. Therefore, ⁇ represents the integrated value of the amount of fine particles flowing into the particulate filter 22.
- step 701 the integrated value ⁇ of the amount of fine particles flowing into the particulate filter 22 exceeds the set value MX and the temperature T at which the temperature TF of the particulate filter 22 can oxidize the fine particles. For example, it is determined whether the temperature is higher than 250 ° C. ⁇ M ⁇ MX or T F ⁇ T.
- the routine proceeds to step 702 and normal operation is performed. At this time, combustion is continuously performed under the lean air-fuel ratio.
- Step 7 On the other hand, go to Step 7 0 1 ⁇ M> MX and TF> T.
- the air-fuel ratio A / F is temporarily rich. Recovery is restored. Note that TF ⁇ T even if ⁇ M> MX. In this case, no rich processing is performed.
- step 704 ⁇ M is cleared. Next, the routine proceeds to step 705.
- step 705 it is determined whether or not the accumulation amount of the fine particles on the particulate filter 22 has exceeded a predetermined amount.
- step 706 It is determined whether or not the pressure loss PD in the particulate filter 22 detected by 43 exceeds the allowable limit PDX corresponding to UL in FIG.
- step 706 a rich process for temporarily making the air-fuel ratio A / F rich is performed, thereby recovering the oxidizing properties of the fine particles.
- step 707 the temperature TF of the particulate filter 22 is raised to 600 ° C. or more under the lean air-fuel ratio and 600 ° C.
- the temperature rise control is performed to maintain the temperature at or above C, whereby the fine particles deposited on the paticular filter 22 are burned.
- the regeneration of the particulate filter 22 is completed, the temperature raising control is stopped, and the normal operation is performed again.
- FIGS. 29 and 30 show an eighth embodiment.
- the fine particles when the fine particles flow into the particulate filter 22, the fine particles eventually become residual particles WR 5 having the lowest oxidizability. Therefore, the most oxidizable particles are calculated from the integrated value of the amount of the fine particles flowing into the particulate filter 22. Therefore, it is possible to estimate the residual particle amount WR5 with a low level. In other words, the amount WR 5 of residual particles having the lowest oxidizability can be estimated from the increase in pressure loss in the particulate filter 22. Therefore, in this embodiment, when the actual pressure loss PD in the particulate filter 22 exceeds the set value DPTT, the air-fuel ratio AZF is temporarily made rich. In this case, when the air-fuel ratio AZF rich processing is completed, the set value DPTT is set to temporarily reset the air-fuel ratio AZF again. Is increased by ⁇ D.
- the initial set value DPTT is stored in the ROM 32 in advance in the form of a map as a function of the required torque TQ and the engine speed N as shown in Fig. 29A. Also, as shown in FIG. 29B, it is stored in the ROM 32 in advance in the form of a map as a function of the required torque TQ and the engine speed N.
- FIG. 30 shows a flowchart for executing the eighth embodiment.
- step 800 the actual pressure loss PD detected by the pressure sensor 43 is larger than the set value DPTT calculated from the map of FIG. Temperature T of filter 22 Temperature T at which TF can oxidize fine particles. For example, it is determined whether the temperature is higher than 250 ° C. D P ⁇ D P T T or T F ⁇ T. In such a case, the routine proceeds to step 801 and normal operation is performed. At this time, combustion is continuously performed under the lean air-fuel ratio. Then, proceed to step 804.
- step 800 D P> D PTT and T F> T. If it is determined that the air-fuel ratio AZF is reached, a rich process for temporarily enriching the air-fuel ratio AZF is performed, thereby recovering the oxidizing properties of the fine particles. Note that T F ⁇ T even if D P> D P T T. In this case, no rich processing is performed.
- step 803 the increment calculated from the map shown in FIG. 29B is added to the set value D PTT, and the addition result is used as a new set value D PTT. Then go to step 804.
- step 804 it is determined whether or not the accumulation amount of the fine particles on the particulate filter 22 has exceeded a predetermined amount, that is, the pressure loss in the particulate filter 22 detected by the pressure sensor 43. It is determined whether the PD has exceeded the allowable limit PDX corresponding to UL in FIG.
- step 805 a rich process for temporarily making the air-fuel ratio A rich is performed, thereby recovering the oxidizing property of the fine particles.
- step 806 proceeds to step 806, in which the temperature TF of the particulate filter 22 is raised to 600 ° C. or more and maintained at 600 ° C. or more under a lean air-fuel ratio.
- the temperature rise control is performed, whereby the fine particles deposited on the particulate filter 22 are burned.
- the temperature raising control is stopped, and the normal operating force s is again performed.
- the fine particles deposited on the particulate filter can be burned in a short time.
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
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KR10-2002-7017526A KR100517191B1 (ko) | 2001-04-26 | 2002-02-20 | 배기가스 정화장치 |
CA002415296A CA2415296C (en) | 2001-04-26 | 2002-02-20 | Exhaust gas purification apparatus |
AU2002233656A AU2002233656B2 (en) | 2001-04-26 | 2002-02-20 | Exhaust emission control device |
DE60207064T DE60207064T2 (de) | 2001-04-26 | 2002-02-20 | Abgasreinigungsvorrichtung |
HU0301462A HUP0301462A2 (en) | 2001-04-26 | 2002-02-20 | Exhaust gas purification device for internal combustion engine |
EP02700641A EP1382811B1 (en) | 2001-04-26 | 2002-02-20 | Exhaust gas purification apparatus |
US10/311,016 US6820418B2 (en) | 2001-04-26 | 2002-02-20 | Exhaust gas purification apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2001-130109 | 2001-04-26 | ||
JP2001130109A JP3707395B2 (ja) | 2001-04-26 | 2001-04-26 | 排気ガス浄化装置 |
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WO2002090731A1 true WO2002090731A1 (fr) | 2002-11-14 |
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PCT/JP2002/001499 WO2002090731A1 (fr) | 2001-04-26 | 2002-02-20 | Dispositif de regulation d'emission de gaz polluants |
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US (1) | US6820418B2 (ja) |
EP (1) | EP1382811B1 (ja) |
JP (1) | JP3707395B2 (ja) |
KR (1) | KR100517191B1 (ja) |
CN (1) | CN1254605C (ja) |
AU (1) | AU2002233656B2 (ja) |
CA (1) | CA2415296C (ja) |
CZ (1) | CZ298168B6 (ja) |
DE (1) | DE60207064T2 (ja) |
ES (1) | ES2250610T3 (ja) |
HU (1) | HUP0301462A2 (ja) |
PL (1) | PL358130A1 (ja) |
WO (1) | WO2002090731A1 (ja) |
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ATE477405T1 (de) * | 2006-06-28 | 2010-08-15 | Fiat Ricerche | Regeneration eines dieselpartikelfilters |
US7543446B2 (en) * | 2006-12-20 | 2009-06-09 | Cummins, Inc. | System for controlling regeneration of exhaust gas aftertreatment components |
JP5123686B2 (ja) * | 2008-02-08 | 2013-01-23 | 三菱重工業株式会社 | Dpf堆積量推定装置 |
US7835847B2 (en) * | 2008-02-28 | 2010-11-16 | Cummins Ip, Inc | Apparatus, system, and method for determining a regeneration availability profile |
US8499550B2 (en) * | 2008-05-20 | 2013-08-06 | Cummins Ip, Inc. | Apparatus, system, and method for controlling particulate accumulation on an engine filter during engine idling |
RU2460572C1 (ru) * | 2011-05-04 | 2012-09-10 | Государственное образовательное учреждение высшего профессионального образования "Самарский государственный университет путей сообщения" (СамГУПС) | Способ очистки газообразных продуктов сгорания |
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- 2002-02-20 PL PL02358130A patent/PL358130A1/xx unknown
- 2002-02-20 HU HU0301462A patent/HUP0301462A2/hu unknown
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- 2002-02-20 KR KR10-2002-7017526A patent/KR100517191B1/ko not_active IP Right Cessation
- 2002-02-20 CN CNB028014103A patent/CN1254605C/zh not_active Expired - Fee Related
- 2002-02-20 US US10/311,016 patent/US6820418B2/en not_active Expired - Fee Related
- 2002-02-20 ES ES02700641T patent/ES2250610T3/es not_active Expired - Lifetime
- 2002-02-20 AU AU2002233656A patent/AU2002233656B2/en not_active Ceased
- 2002-02-20 DE DE60207064T patent/DE60207064T2/de not_active Expired - Fee Related
- 2002-02-20 CZ CZ20024051A patent/CZ298168B6/cs not_active IP Right Cessation
- 2002-02-20 WO PCT/JP2002/001499 patent/WO2002090731A1/ja active IP Right Grant
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Also Published As
Publication number | Publication date |
---|---|
EP1382811A1 (en) | 2004-01-21 |
CN1462332A (zh) | 2003-12-17 |
US20030172642A1 (en) | 2003-09-18 |
HUP0301462A2 (en) | 2003-09-29 |
CZ298168B6 (cs) | 2007-07-11 |
JP2002322908A (ja) | 2002-11-08 |
CA2415296C (en) | 2005-05-17 |
CN1254605C (zh) | 2006-05-03 |
CZ20024051A3 (cs) | 2003-06-18 |
ES2250610T3 (es) | 2006-04-16 |
KR100517191B1 (ko) | 2005-09-28 |
CA2415296A1 (en) | 2002-12-19 |
PL358130A1 (en) | 2004-08-09 |
DE60207064T2 (de) | 2006-08-03 |
AU2002233656B2 (en) | 2004-06-10 |
DE60207064D1 (de) | 2005-12-08 |
US6820418B2 (en) | 2004-11-23 |
JP3707395B2 (ja) | 2005-10-19 |
EP1382811B1 (en) | 2005-11-02 |
EP1382811A4 (en) | 2004-06-09 |
KR20030013458A (ko) | 2003-02-14 |
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