WO2006041187A1 - 内燃機関の排気浄化装置 - Google Patents
内燃機関の排気浄化装置 Download PDFInfo
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- WO2006041187A1 WO2006041187A1 PCT/JP2005/019152 JP2005019152W WO2006041187A1 WO 2006041187 A1 WO2006041187 A1 WO 2006041187A1 JP 2005019152 W JP2005019152 W JP 2005019152W WO 2006041187 A1 WO2006041187 A1 WO 2006041187A1
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- temperature
- particulate filter
- filter
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Classifications
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- 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
- B01D53/944—Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
- B01D46/80—Chemical processes for the removal of the retained particles, e.g. by burning
- B01D46/84—Chemical processes for the removal of the retained particles, e.g. by burning by heating only
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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
- F01N3/022—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 characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
- F01N3/0222—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 characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
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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
- 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
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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
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
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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
- F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
- F02D41/0245—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus by increasing temperature of the exhaust gas leaving the engine
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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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- 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
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/06—Ceramic, e.g. monoliths
-
- 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
- F01N2510/00—Surface coverings
- F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
- F01N2510/065—Surface coverings for exhaust purification, e.g. catalytic reaction for reducing soot ignition temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1602—Temperature of exhaust gas apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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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- 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
Definitions
- the present invention relates to an exhaust emission control device for an internal combustion engine provided with a particulate filter, and more particularly to a technique for regenerating the PM collection ability of a particulate filter.
- Japanese Patent Publication No. 5-5 0 5 7 1 discloses that the amount of PM collected by the particulate filter is estimated sequentially, and when the estimated value exceeds a predetermined upper limit amount, A technique is disclosed in which forced regeneration processing is started and PM forced regeneration processing is terminated when the estimated value is equal to or lower than a predetermined lower limit value.
- Japanese Patent No. 3 1 9 9 7 0 discloses a technique for increasing the temperature rise of the particulate filter during the forced PM regeneration process as the amount of PM trapped by the particulate filter increases.
- Japanese Laid-Open Patent Publication No. 2 0 3 -1 6 6 4 1 2 discloses the knowledge that PM deposited on the ridges of the partition walls constituting the particulate filter is easily oxidized.
- Japanese Patent No. 2 6 2 3 8 79 discloses a method for calculating the amount of PM trapped by a particulate filter in consideration of the fact that PM is naturally combusted.
- the oxidation rate of PM may be different for each part of the particulate filter.
- the PM forced regeneration process is not performed considering that the PM oxidation rate differs for each part of the particulate filter, so the target filter temperature at the time of executing the PM forced regeneration process is not performed. There is a possibility that the execution time of PM forced regeneration processing becomes inappropriate.
- the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a technique capable of performing appropriate PM forced regeneration processing in accordance with the oxidation rate of PM collected in the particulate filter. In the point.
- a feature of the present invention is that an exhaust gas purification apparatus for an internal combustion engine forcibly oxidizes and removes PM collected by the particulate filter by performing PM forced regeneration processing for raising the temperature of the particulate filter.
- the amount of PM collected by the filter is obtained for each part with a different PM oxidation rate, and the target filter temperature and execution time of the forced PM regeneration process are changed according to the amount of PM collected at each part.
- the present invention relates to an amount of PM collected by a particulate filter in an exhaust gas purification apparatus for an internal combustion engine in which PM forced regeneration processing for raising the temperature of the particulate filter to a target filter temperature is performed every predetermined period.
- the amount of trapped amount is calculated for each part with a different PM oxidation rate, and the amount of trapped parts at a part with a high oxidation rate (hereinafter referred to as a high oxidation rate part) at the start of execution of the PM forced regeneration process is
- the target filter temperature at the time of executing the PM forced regeneration process may be lowered as the trapped amount of the site having a large and low oxidation rate (hereinafter referred to as a low oxidation rate site) decreases.
- the exhaust gas purification apparatus for an internal combustion engine configured as described above executes PM forced regeneration processing every predetermined period. If the amount of PM collected in the high oxidation rate region is large and the amount of PM collected in the low oxidation rate region is small when the forced PM regeneration process starts, the target finer temperature at the time of the forced PM regeneration process is low. Set ⁇ L.
- the PM collected in the high acid ratio site is oxidized at a lower temperature than the PM collected in the low acid ratio site. For this reason, when the forced PM regeneration process is started, PM capture at the high oxidation rate site is performed. If the collected amount is high and the amount of PM collected at the low oxidation rate site is small, most of the PM collected on the particulate filter will be oxidized even if the target filter temperature during the forced PM regeneration process is lowered. The As a result, the PM trapping capacity of the particulate filter is regenerated as necessary.
- the target filter temperature during execution of the forced PM regeneration process is kept low, the particulate filter is not exposed to high temperatures, and the durability of the particulate filter can be improved. Furthermore, if the target filter temperature during the forced PM regeneration process is kept low, the energy required to raise the particulate filter to the target filter temperature will be reduced, thus improving the fuel efficiency of the internal combustion engine. Is also possible.
- the target filter temperature during execution of the forced PM regeneration process is reduced. Set high.
- PM collected at the low oxidation rate site can be oxidized in addition to PM collected at the high oxidation rate site. If the target filter temperature is set to a high value, as a result, the PM collection ability of the particulate filter is suitably reproduced.
- the amount of PM collected by the particulate filter is obtained for each part having a different PM oxidation rate, and the PM forced regeneration process is performed according to the amount of PM collected at each part.
- the target filter temperature may be increased regardless of the collection amount of the high oxidation rate region. For example, when the amount of collected low-oxygen sites is zero at the start of PM forced regeneration processing, the target filter temperature is suppressed to a temperature at which PM in the high-oxidation rate sites can be oxidized, and Collected amount from zero When there are many, the target filter temperature may be raised to a temperature at which PM at the low oxidation rate site can be oxidized.
- the particulate amount collected by the particulate filter is particulated.
- the first regeneration means that performs PM forced regeneration, and the particulate filter rises to the second target filter temperature that is higher than the first target filter temperature when the amount of PM collected at the low oxidation rate site exceeds the second predetermined amount.
- a second regeneration means for performing a second PM forced regeneration process for heating is performed when the PM collection amount exceeds a predetermined amount.
- the first regeneration means executes the first PM forced regeneration process.
- the second regeneration means performs the second PM forced regeneration. Execute the process.
- the particulate filter is heated to a relatively high temperature range, so that it is possible to oxidize PM collected in the low oxidation rate region.
- the temperature of the particulate filter is suppressed to a lower temperature than that of the 2nd PM forced regeneration process, so that the particulate filter is collected at a high oxidation rate site without being exposed to a high temperature.
- the oxidized PM can be oxidized. Further, it is possible to suppress a decrease in fuel consumption due to regeneration of the particulate filter.
- the second predetermined amount may be set smaller than the first predetermined amount. If the second predetermined amount is set smaller than the first predetermined amount, the possibility that the first PM forced regeneration process is performed when the amount of PM trapped at the low oxidation rate site is relatively large is reduced. As a result, it is possible to suppress a decrease in the regeneration efficiency of the particulate filter.
- the collection amount calculation means in the present invention may increase the subtraction amount when subtracting the collection amount of the high oxidation rate region compared to subtracting the collection amount of the low oxidation rate region. This is because PM collected at the high oxidation rate site is oxidized at a lower temperature and the acid speed is faster than PM collected at the low oxidation rate site.
- a particulate filter formed of a porous material can be exemplified.
- the site with a high oxidation rate is the surface of the base material in and near the holes of the base material
- the site with a low acid ratio is a part of the base material surface excluding the site near the holes.
- FIG. 1 is a diagram showing a schematic configuration of an internal combustion engine to which the present invention is applied.
- FIG. 2 is an enlarged cross-sectional view showing the configuration of the particulate filter.
- FIG. 3 is an explanatory diagram showing the oxidation state of PM collected by the particulate filter.
- Fig. 4 is a diagram showing the relationship between the differential pressure across the filter and the amount of PM trapped by the entire particulate filter.
- FIG. 5 is a flowchart showing the PM collection amount calculation routine in the first embodiment.
- FIG. 6 is a flowchart showing a target filter temperature setting routine in the first embodiment.
- FIG. 7 is a flowchart showing a target filter temperature setting routine in the second embodiment.
- FIG. 1 is a diagram showing a schematic configuration of an internal combustion engine to which the present invention is applied.
- an internal combustion engine 1 is a compression ignition type internal combustion engine (diesel engine) operated using light oil as fuel.
- the internal combustion engine 1 has a plurality of cylinders 2, and each cylinder 2 is provided with a fuel injection valve 3 that injects fuel directly into the cylinder 2.
- An intake passage 4 is connected to the internal combustion engine 1.
- a compressor housing 50 of a centrifugal supercharger (turbocharger) 5 is disposed in the intake passage 4.
- An air flow meter 6 is disposed in the intake passage 4 upstream of the compressor housing 50.
- An intake air cooler (intercooler) 7 is disposed in the intake passage 4 downstream of the compressor housing 50.
- An intake throttle valve 8 is disposed in the intake passage 4 downstream of the intercooler 7.
- An exhaust passage 9 is connected to the internal combustion engine 1.
- a turbine housing 51 of the turbocharger 5 is disposed in the middle of the exhaust passage 9.
- the particulate filter 10 is disposed in the exhaust passage 9 downstream of the turbine housing 51.
- the particulate filter 10 is upstream of the flow path 10a with the downstream end blocked as shown in FIG.
- Wall flow type particulates in which the flow paths 1 O b whose ends are closed are alternately arranged and the partition walls of the flow paths 10 a and 10 b are formed of a porous base material It is a filter.
- the above-mentioned brazing material carries a catalyst having an oxidizing ability.
- a fuel addition valve 11 for adding fuel to the exhaust flowing in the exhaust passage 9 is disposed in the exhaust passage 9 upstream of the turbine housing 51.
- An exhaust temperature sensor 12 is arranged in the exhaust passage 9 downstream of the particulate filter 10. Further, the exhaust passage 9 is provided with a differential pressure sensor 13 for detecting a differential pressure between the exhaust pressure upstream of the particulate filter 10 and the exhaust pressure downstream (hereinafter referred to as differential pressure across the filter). .
- the internal combustion engine 1 configured as described above is provided with an ECU 14.
- the ECU 14 is an arithmetic logic operation circuit composed of a CPU, ROM, RAM, backup RAM, and the like.
- the ECU 14 is electrically connected to various sensors such as the air flow meter 6, the exhaust temperature sensor 12 and the differential pressure sensor 13 described above.
- the ECU 14 is electrically connected to the fuel injection valve 3, the intake throttle valve 8, the fuel addition valve 11 and the like.
- the ECU 14 executes PM regeneration control, which is the gist of the present invention, in addition to known control such as fuel injection control.
- the ECU 14 determines whether or not an execution condition for the PM forced regeneration process is satisfied.
- the execution condition for the forced PM regeneration process in this embodiment is that the elapsed time from the previous PM forced regeneration process execution is a certain time or more, and the vehicle travel distance from the previous PM forced regeneration process execution is a certain distance or more. There are some examples.
- the ECU 14 executes the PM forced regeneration process when it is determined that the above-described PM forced regeneration process execution condition is satisfied.
- the ECU 14 reduces the opening of the intake throttle valve 8 and adds fuel from the fuel addition valve 11 into the exhaust gas, thereby bringing the particulate filter 10 to a temperature range where PM oxidation is possible. Raise the temperature.
- the particulate filter 10 is heated to a temperature range where PM oxidation is possible, the PM collected in the particulate filter 10 is oxidized and removed.
- the oxidation rate of PM collected by the particulate filter 10 differs depending on the collection site. For example, inside the pore 10 d of the particulate filter 10 Sites near the pores 10 d have a high PM oxidation rate, and sites away from the pores 10 d (portions near the center in the channels 10 a and 10 b) have a low PM oxidation rate.
- FIG. (A) of FIG. 3 shows the state of the flow path 10a immediately before the PM collection capacity of the particulate filter 10 is saturated.
- the filled area in Fig. 3 (a) shows the collected PM.
- PM is collected in the pore 10 d and PM is also deposited on the surface of the partition wall 10 c (in the flow path 10 a).
- FIG. 3 shows the state of the flow path 10a at a relatively early time after the execution of the forced PM regeneration process.
- the PM collected in the pore 10 d or in the vicinity of the pore 10 d is oxidized and removed, and the portion away from the pore 10 d (in other words, near the center in the channel 10 a
- the PM collected in (1) remains without being oxidized.
- the PM collected in the pore 10 d or in the vicinity of the pore 10 d is more easily oxidized than the PM deposited on the surface of the partition wall 10 c.
- PM deposited on the surface of the partition wall 10 c is difficult to oxidize unless exposed to an atmosphere of 60 to 700 ° C.
- the PM collected in can be sufficiently oxidized if it is exposed to an atmosphere of about 500 ° C. to 55 ° C.
- the amount of PM collected in the pore 10 d and in the vicinity of the pore 10 d (hereinafter simply referred to as the inside of the pore 10 d) and the amount of PM collected in the channels 10 a and 10 b are calculated. Describe the method to obtain individually.
- the exhaust flowing through the particulate filter 10 flows from the flow channel 10 0 a to the pore 10 0 d. After that, it flows to the channel 10 b. Since the passage cross-sectional area of the pore 10 d is extremely small compared to the channel 10 a, PM in the exhaust gas is more easily collected in the pore 10 d than in the channel 10 a.
- the particulate filter 10 collects PM, the PM in the exhaust is first collected in the pore 10 d. Subsequently, when the PM collection capacity in the pore 10 d is saturated, PM in the exhaust gas is collected in the flow path 10 a. This tendency becomes remarkable in the Wolf mouth type particulate filter exemplified in the present embodiment.
- the differential pressure across the filter increases as the PM collection amount of the entire particulate filter 10 increases.
- the rate of increase in the differential pressure across the filter differs between the process in which PM is collected in the process and the process in which PM is collected in the channel 10a.
- FIG. 4 is a graph showing the relationship between the differential pressure across the filter and the total amount of PM trapped by the particulate filter 10 as a whole.
- D p 0 in Fig. 4 indicates the differential pressure across the filter when the total PM trapping volume of the particulate filter 10 is zero, and D ps is when the PM trapping capacity in the pore 10 d is saturated.
- ⁇ PM s is the total amount of PM trapped when the filter front-rear differential pressure is the reference filter front-rear differential pressure D ps.
- the maximum PM collection amount that can be collected within 10 d (hereinafter referred to as the maximum collection amount in the pores) is shown.
- the differential pressure across the filter When the differential pressure across the filter is less than or equal to the differential pressure D ps before and after the reference filter (the process in which PM is collected in the pore 10 d), the differential pressure across the filter increases rapidly. On the other hand, when the differential pressure across the filter becomes higher than the differential pressure D ps across the reference filter (channel 10 a During the process of collecting PM, the differential pressure across the filter increases gently.
- the differential pressure Dps before and after the reference filter is experimentally obtained in advance, and by comparing the output signal value of the differential pressure sensor 13 at the start of the execution of the forced PM regeneration process with the differential pressure Dps before and after the reference filter, It is possible to determine whether the PM is collected only in the pore 10 d or whether PM is collected in both the pore 10 d and the flow path 10 a. .
- the total PM trapped amount of the particulate filter 10 can be regarded as the PM trapped amount in the pore 10d.
- the amount of PM trapped in the flow path 10a can be regarded as zero.
- the PM trapped amount in the pore 10 d is equal to the maximum trapped amount ⁇ PMs in the pore and the flow path 1 0 It can be considered that the amount of PM trapped in a is equal to the total amount of PM trapped minus the maximum trapped amount ⁇ PMs in the pore.
- the exhaust temperature is equal to or higher than the temperature at which PM in the pore 10 d can be oxidized and the PM in the flow path 10 a is lower than the temperature at which oxidation is possible, the PM in the flow path 10 a is oxidized. Only PM in the pore 10d is oxidized. Therefore, the ECU 14 subtracts only the amount of pM collected in the pore 10d.
- the ECU 14 subtracts the PM collection amount in the pore 10 d and the PM collection amount in the flow path 10 a.
- the channel 10 is used when subtracting the amount of PM trapped in the pore 10 d. Increase the amount of subtraction compared to subtracting the amount of PM trapped in a.
- ECU 14 is based on the PM trapped amount in the pore 10 d and the PM trapped amount in the channel 10 a. Set the target filter temperature.
- the ECU 14 sets the target filter temperature to the PM in the pore 10 d when the amount of PM collected in the pore 10 d is large and the amount of PM collected in the flow path 10 a is small. Is set to a temperature at which can be oxidized (for example, 500 ° C. to 5500 ° C.).
- the PM collecting ability of the particulate filter 10 can be regenerated while keeping the temperature of the particulate filter 10 low. For this reason, the temperature of the particulate filter 10 is not raised to an unnecessarily high temperature. As a result, the durability of the particulate filter 10 can be improved, and the fuel consumption required for raising the temperature of the particulate filter 10 can be reduced.
- the ECU 14 sets the target filter temperature to a temperature at which PM in the flow path 10a can be oxidized (for example, 60 0 Increase to ° C ⁇ 700 ° C).
- the PM collected in the flow path 10 a is also oxidized, so that it is collected in the particulate filter 10. Almost all PM can be oxidized and removed.
- Figure 5 is a flowchart showing a routine for calculating the amount of PM collected by the particulate filter 10
- FIG. 6 is a flowchart showing a routine for setting the target filter temperature for the PM forced regeneration process.
- the ECU 14 determines whether or not the output signal value TeX of the exhaust temperature sensor 12 is lower than the first temperature T1 in S101.
- the first temperature T 1 is a lower limit value of the temperature at which PM collected in the pores 10 d can be oxidized.
- the ECU 14 reads the output signal value (differential pressure before and after the filter) Dp of the differential pressure sensor 13 in S102.
- the ECU 14 calculates the total PM trapping amount PM of the particulate filter 10 based on the differential pressure Dp before and after the filter read in S102 and the map shown in FIG.
- the ECU 14 determines whether or not the filter front-rear differential pressure Dp read in S102 is equal to or lower than the reference filter front-rear differential pressure Dp s.
- the ECU 14 proceeds to S105, where the total PM collection amount ⁇ PM calculated in S103 is collected in the pore 10d P Mi (hereinafter, Set as ⁇ ), and set the amount of soot collected in the channel 10a (hereinafter referred to as trapped amount in the channel) ⁇ PMf to zero.
- the ECU 14 proceeds to S 107 and determines whether or not the exhaust temperature Te X is lower than the second temperature T 2.
- the second temperature T 2 is a lower limit value of the temperature at which the soot collected in the flow path 10a can be oxidized.
- the ECU 14 proceeds to S108 and performs a subtraction process for the trapped amount ⁇ in the pores.
- the subtraction amount may be determined using the exhaust temperature Te x as a parameter.
- the ECU 14 proceeds to S109 and subtracts both the trapped amount ⁇ PMp in the pores and the trapped amount ⁇ PMf in the flow channel. Process. At that time, the subtraction amount of the trapped amount ⁇ PMf in the flow path is set to be smaller than the subtraction amount of the trapped amount p PMp in the pores.
- the ECU 14 first determines in S201 whether or not the elapsed time from the previous execution of the forced PM regeneration process is a predetermined time or more. If a negative determination is made in S 201, the ECU 14 once ends the execution of this routine. If an affirmative determination is made in S201, the ECU 14 proceeds to S202.
- the ECU 14 reads the latest trapped amount ⁇ PMp and trapped amount ⁇ PMf in the flow passage obtained in the routine of FIG. 5 described above.
- the predetermined amount PM1 is an amount that does not saturate the PM trapping capacity of the particulate filter 10 even if the internal combustion engine 1 is operated for a predetermined time with the PM of the predetermined amount PM1 remaining in the flow path 10a of the particulate filter 10. However, in this embodiment, it is set to zero.
- the ECU 14 proceeds to S204, and sets the target filter temperature of the PM forced regeneration process to the first target filter temperature Temp1.
- the first target filter temperature T emp 1 is a temperature at which PM collected in the pores 10 d can be oxidized, and is set to about 500 ° C. to 550 ° C., for example.
- the particulate filter 10 is not exposed to an unnecessarily high temperature atmosphere. As a result, the durability of the particulate filter 10 can be improved, and the fuel consumption required for raising the temperature of the particulate filter 10 can be reduced.
- the above-described PM forced regeneration process may be performed until the trapped amount ⁇ ⁇ ⁇ becomes zero.
- the ECU 14 executes the trap collection amount calculation routine of FIG. 5 described above even during execution of the trap regeneration process, and the trap amount in the pores calculated by the trap collection amount calculation routine ⁇ ⁇ ⁇ ⁇ When it reaches zero, ⁇ ⁇ Compulsory regeneration processing should be terminated.
- the ECU 14 proceeds to S 205 and sets the target filter temperature to the second target filter temperature T emp 2 that is higher than the first target filter temperature T em ⁇ 1 described above.
- the second target filter temperature T emp2 is a temperature at which PM collected in the flow path 10a can be oxidized, and is set to, for example, about 600 ° C to 700 ° C.
- the above-described PM forced regeneration process may be executed until the trapped amount ⁇ and the trapped amount ⁇ Mf in the flow channel become zero.
- the ECU 14 executes the PM collection amount calculation routine of FIG. 5 described above even during execution of the PM forced regeneration process, and the trapped amount ⁇ PM p in the pore calculated by the PM collection amount calculation routine is Zero and in the flow path
- the PM forced regeneration process may be terminated when the collected amount ⁇ PM f becomes zero.
- the PM trapped amount of the particulate filter 10 is oxidized by the PM in the exhaust gas purification apparatus of the internal combustion engine in which the PM forced regeneration process is executed every predetermined time. While being able to obtain
- the present invention is applied to the exhaust gas purification apparatus for an internal combustion engine in which the PM forced regeneration process is performed every predetermined period.
- the PM collection of the particulate filter is performed.
- An example in which the present invention is applied to an exhaust gas purification apparatus for an internal combustion engine in which PM forced regeneration processing is performed when the amount exceeds a predetermined amount will be described.
- the ECU 14 obtains the trapped amount ⁇ and the trapped amount ⁇ PMf in the pores by the same method as in the first embodiment, and the trapped amount ⁇ is the first place.
- PM forced regeneration processing is performed when the quantity ⁇ 2 or more, or when the trapped amount ⁇ PMf in the flow path becomes the second predetermined amount ⁇ 3 or more.
- the ECU 14 sets the target filter temperature to the first target filter temperature.
- the PM forced regeneration process is executed with T emp 1 set (hereinafter referred to as the first PM forced regeneration process).
- the forced PM regeneration process is performed on the condition that the trapped amount ⁇ PMf in the flow path becomes equal to or greater than the second predetermined amount PM3
- the ECU 14 sets the target filter temperature to the second target filter temperature.
- Set to emp 2 and execute PM forced regeneration processing ( Hereinafter, it is referred to as a second PM forced regeneration process).
- the first predetermined amount PM 2 described above is the maximum amount of trapped amount ⁇ ⁇ ⁇ in the pores, that is, the same amount as the maximum trapped amount ⁇ PMs in the pores.
- the second predetermined amount PM3 described above has a back pressure even when the internal combustion engine 1 is operated in a state where PM of the second PM predetermined amount PM3 remains in the flow paths 10a and 10b of the particulate filter 10.
- the PM of the second predetermined amount PM3 is oxidized at the same time, for example, when it is not excessively increased and the operation is shifted from the high load operation to the deceleration operation state, the particulate filter 10 does not overheat.
- FIG. 7 is a flowchart showing the PM regeneration control routine.
- This PM regeneration control routine is a routine that is stored in advance in the ROM of the ECU 14 and is a routine that is repeatedly executed by the ECU 14 at predetermined time intervals.
- the ECU 14 first reads the trapped amount ⁇ PMp in the pores and the trapped amount ⁇ PM f in the flow path in S301.
- the ECU 14 determines whether or not the trapped amount ⁇ PMf in the flow path is smaller than a second predetermined amount PM3.
- the ECU 14 proceeds to S303.
- the ECU 14 determines whether or not the trapped amount ⁇ P′Mp in the pore is equal to or greater than the first predetermined amount PM 2.
- the particulate filter 10 can be put into the putty without exposing it to an unnecessarily high temperature. It is possible to regenerate the PM collection capacity of the particulate filter 10 as necessary and sufficient.
- the ECU 14 proceeds to S305.
- the ECU 14 executes the second PM forced regeneration process regardless of the trapped amount in the pores ⁇ PMp. .
- the first embodiment described above in the exhaust gas purification apparatus for an internal combustion engine in which the PM forced regeneration process is executed on the condition that the amount of PM trapped exceeds a predetermined amount, the first embodiment described above The same effect can be obtained.
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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)
- Processes For Solid Components From Exhaust (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05795221A EP1801371B1 (en) | 2004-10-12 | 2005-10-12 | Internal combustion engine exhaust cleaner |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004297995A JP4214982B2 (ja) | 2004-10-12 | 2004-10-12 | 内燃機関の排気浄化装置 |
JP2004-297995 | 2004-10-12 |
Publications (1)
Publication Number | Publication Date |
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WO2006041187A1 true WO2006041187A1 (ja) | 2006-04-20 |
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PCT/JP2005/019152 WO2006041187A1 (ja) | 2004-10-12 | 2005-10-12 | 内燃機関の排気浄化装置 |
Country Status (3)
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EP (1) | EP1801371B1 (ja) |
JP (1) | JP4214982B2 (ja) |
WO (1) | WO2006041187A1 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JP4935390B2 (ja) * | 2007-02-05 | 2012-05-23 | トヨタ自動車株式会社 | 内燃機関の排気浄化システム |
JP2009264181A (ja) * | 2008-04-23 | 2009-11-12 | Toyota Motor Corp | 内燃機関の排気浄化装置 |
SE536981C2 (sv) * | 2013-03-05 | 2014-11-25 | Scania Cv Ab | Förfarande och anordning för avgasrening vid en förbränningsmotor |
JP6256393B2 (ja) | 2015-03-17 | 2018-01-10 | トヨタ自動車株式会社 | 内燃機関の排気浄化システム |
CN112105804B (zh) * | 2018-04-27 | 2022-05-27 | 日产自动车株式会社 | 内燃机的排气净化装置的温度控制方法以及内燃机的控制装置 |
FR3085423B1 (fr) * | 2018-08-29 | 2020-12-18 | Psa Automobiles Sa | Procede d'estimation de charge d’un filtre a particules |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0544440A (ja) * | 1991-08-09 | 1993-02-23 | Nissan Motor Co Ltd | 内燃機関の排気処理装置 |
JPH06288220A (ja) * | 1992-02-03 | 1994-10-11 | Atom Energ Of Canada Ltd Energ Atom Du Canada Ltd | ディーゼル排気フィルターの粒子状物質捕集量分布検出方法及び装置 |
JPH06307226A (ja) * | 1993-04-20 | 1994-11-01 | Riken Corp | フィルタの粒子状物質堆積密度分布検出方法および粒子状物質堆積密度分布検出装置 |
JPH11343831A (ja) * | 1998-04-29 | 1999-12-14 | Inst Fr Petrole | 粒子濾過器の局部的なかつ制御された評価および再生方法および装置 |
JP2001098928A (ja) * | 1999-10-01 | 2001-04-10 | Futaba Industrial Co Ltd | 排ガス微粒子捕集装置 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3199970B2 (ja) * | 1994-12-22 | 2001-08-20 | 株式会社デンソー | エンジンの排気浄化装置 |
JP4161546B2 (ja) * | 2001-06-26 | 2008-10-08 | いすゞ自動車株式会社 | 連続再生型ディーゼルパティキュレートフィルタ装置の再生制御方法 |
JP3757853B2 (ja) * | 2001-11-30 | 2006-03-22 | トヨタ自動車株式会社 | 排気浄化装置の再生制御方法 |
JP4385775B2 (ja) * | 2003-03-03 | 2009-12-16 | 株式会社デンソー | 内燃機関の排気ガス浄化装置 |
-
2004
- 2004-10-12 JP JP2004297995A patent/JP4214982B2/ja not_active Expired - Fee Related
-
2005
- 2005-10-12 EP EP05795221A patent/EP1801371B1/en not_active Expired - Fee Related
- 2005-10-12 WO PCT/JP2005/019152 patent/WO2006041187A1/ja active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0544440A (ja) * | 1991-08-09 | 1993-02-23 | Nissan Motor Co Ltd | 内燃機関の排気処理装置 |
JPH06288220A (ja) * | 1992-02-03 | 1994-10-11 | Atom Energ Of Canada Ltd Energ Atom Du Canada Ltd | ディーゼル排気フィルターの粒子状物質捕集量分布検出方法及び装置 |
JPH06307226A (ja) * | 1993-04-20 | 1994-11-01 | Riken Corp | フィルタの粒子状物質堆積密度分布検出方法および粒子状物質堆積密度分布検出装置 |
JPH11343831A (ja) * | 1998-04-29 | 1999-12-14 | Inst Fr Petrole | 粒子濾過器の局部的なかつ制御された評価および再生方法および装置 |
JP2001098928A (ja) * | 1999-10-01 | 2001-04-10 | Futaba Industrial Co Ltd | 排ガス微粒子捕集装置 |
Also Published As
Publication number | Publication date |
---|---|
EP1801371B1 (en) | 2012-08-08 |
EP1801371A4 (en) | 2010-10-20 |
EP1801371A1 (en) | 2007-06-27 |
JP4214982B2 (ja) | 2009-01-28 |
JP2006112252A (ja) | 2006-04-27 |
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