WO2006030973A1 - 内燃機関の排気浄化システム - Google Patents
内燃機関の排気浄化システム Download PDFInfo
- Publication number
- WO2006030973A1 WO2006030973A1 PCT/JP2005/017536 JP2005017536W WO2006030973A1 WO 2006030973 A1 WO2006030973 A1 WO 2006030973A1 JP 2005017536 W JP2005017536 W JP 2005017536W WO 2006030973 A1 WO2006030973 A1 WO 2006030973A1
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- WO
- WIPO (PCT)
- Prior art keywords
- filter
- internal combustion
- combustion engine
- regeneration control
- idling
- Prior art date
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Classifications
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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
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
- B01D46/446—Auxiliary equipment or operation thereof controlling filtration by pressure measuring
-
- 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
- B01D46/0084—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
- B01D46/0086—Filter condition indicators
-
- 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
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
-
- 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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
- F01N3/106—Auxiliary oxidation catalysts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
- 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
-
- 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
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/08—Introducing corrections for particular operating conditions for idling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/16—Introducing closed-loop corrections for idling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
- B01D2279/30—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for treatment of exhaust gases from IC Engines
-
- 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
- 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
-
- 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 gas purification system for an internal combustion engine provided with a particulate filter that is provided in an exhaust passage of the internal combustion engine and collects particulate matter in the exhaust gas.
- Japanese Patent Laid-Open No. 2 0 3-1 6 1 1 3 9 discloses a particulate filter (hereinafter simply referred to as PM) that is provided in an exhaust passage of an internal combustion engine and collects particulate matter (hereinafter referred to as PM) in exhaust gas. (Referred to as a “finoleter”), when the operation state of the internal combustion engine is idling at the start of the regeneration control of the filter and during the regeneration control, the idling speed is set to a predetermined speed. Techniques for raising are disclosed. Also, Japanese Patent Laid-Open Nos. 2004_6 8880 and Japanese Patent Laid-Open No. 2003- 2 3 9 7 2 4 disclose techniques relating to filter regeneration control. Disclosure of the invention
- the filter regeneration control for oxidizing and removing the PM is performed by raising the temperature of the filter to the target temperature.
- the present invention has been made in view of the above problems, and in an exhaust gas purification system for an internal combustion engine having a filter provided in an exhaust passage of the internal combustion engine, PM deposited on the filter is more preferably oxidized and removed. It is an object to provide a technology that can be used.
- the filter when the operating state of the internal combustion engine is idling when the filter regeneration control is being executed, the filter must be set so as not to be higher than a predetermined upper limit value of the idle speed. If it is determined that the filter regeneration control cannot be continued while suppressing excessive temperature rise, the filter regeneration control is stopped. On the other hand, when the operating state of the internal combustion engine is idling when the filter regeneration control is being executed, the idle speed is within a range not exceeding the predetermined upper limit value of the idle speed. If it is determined that the filter regeneration control can be continued while suppressing the excessive temperature rise of the filter, the idle speed is set to a value higher than normal and the filter regeneration control is continued. .
- the exhaust gas purification system for an internal combustion engine according to the present invention is:
- a particulate finer provided in the exhaust passage of the internal combustion engine for collecting particulate matter in the exhaust;
- PM deposition amount detection means for detecting the amount of particulate matter deposited on the particulate filter
- Filter that executes filter regeneration control to oxidize and remove substances
- an exhaust gas purification system for an internal combustion engine comprising: regeneration control execution means; an idling detection means for detecting that the operating state of the internal combustion engine is idling;
- the lower limit rotational speed at which regeneration can be continued which is the lower limit value of the idle rotational speed that can be generated, is calculated based on the amount of particulate matter detected by the PM deposition amount detection means. And when the filter regeneration control is being executed by the filter regeneration control executing means, and when the idling detecting means detects that the operating state of the internal combustion engine has become idling. Further, the lower limit number of rotations that can be continued to be calculated calculated by the lower limit number of rotations that can be continued to be reproduced is determined in advance.
- filter regeneration control is executed by raising the temperature of the filter to the target temperature when the PM accumulation amount in the filter becomes equal to or greater than the specified PM accumulation amount.
- the target temperature is a temperature at which PM deposited on the filter can be oxidized and removed, and a temperature at which the filter can be prevented from being melted or excessively deteriorated.
- the filter regeneration control when the filter regeneration control is being executed and the operating state of the internal combustion engine is idling, if the lower limit rotation speed at which regeneration can be continued is higher than the upper limit value of the idle rotation speed, the filter regeneration control Stop execution. As a result, not only the excessive temperature rise of the filter but also an excessive increase in the idling speed can be suppressed.
- the present invention even when the operating state of the internal combustion engine becomes idling when the filter regeneration control is being executed, not only the excessive temperature rise of the filter but also the excessive increase in the idling speed is achieved. Can also be suppressed. In other words, fuel consumption can be prevented from deteriorating.
- filter regeneration control can be promoted as much as possible. Therefore, PM deposited on the filter can be oxidized and removed more suitably.
- the lower limit rotation speed at which regeneration can be continued decreases as the PM accumulation amount decreases.
- the idling speed can be made as low as possible while suppressing excessive temperature rise of the filter. In other words, it is possible to further suppress deterioration of fuel consumption and emission while suppressing excessive temperature rise of the filter.
- the filter regeneration control when the filter regeneration control is being executed, the operating state of the internal combustion engine Based on the amount of accumulated PM when idling occurs, the lower limit rotation speed that allows regeneration to continue is calculated. For this reason, if the period during which the PM accumulation amount is relatively large becomes shorter during the execution of filter regeneration control, the lower limit rotational speed at which regeneration can be continued when the operating state of the internal combustion engine becomes idle. The period to be shortened. In other words, the period during which the filter regeneration control is stopped when the operating state of the internal combustion engine becomes idling is reduced.
- the period during which the execution of the filter regeneration control is stopped when the operation state of the internal combustion engine becomes idling during the execution of the filter regeneration control is shortened as the idling frequency is higher. I can do it. As a result, even when the idling frequency is high, the frequency at which the execution of the filter regeneration control is stopped can be suppressed. This facilitates the oxidation and removal of PM deposited on the filter.
- FIG. 1 is a diagram showing a schematic configuration of an internal combustion engine and its intake / exhaust system according to an embodiment of the present invention.
- FIG. 2 is a flowchart showing a control routine of filter overheating suppression control according to the embodiment of the present invention.
- FIG. 1 is a diagram showing a schematic configuration of an internal combustion engine and an intake / exhaust system thereof according to the present embodiment.
- the internal combustion engine 1 is a diesel engine for driving a vehicle.
- An intake passage 4 and an exhaust passage 2 are connected to the internal combustion engine 1.
- a throttle valve 8 is provided in the intake passage 4.
- the exhaust passage 2 is provided with a particulate filter 3 (hereinafter simply referred to as filter 3) for collecting PM in the exhaust.
- filter 3 particulate filter 3
- an oxidation catalyst 6 is provided in the exhaust passage 2 upstream of the filter 3. It should be noted that the oxidation catalyst 6 may not be provided in the exhaust passage 2 upstream of the filter 3 but the oxidation catalyst may be supported on the filter 3.
- the exhaust passage 2 is provided with an exhaust differential pressure sensor 9 that outputs an electrical signal corresponding to the exhaust differential pressure before and after the filter 3.
- An exhaust temperature sensor 7 that outputs an electrical signal corresponding to the temperature of the exhaust gas flowing through the exhaust passage 2 is provided in the exhaust passage 2 downstream of the filter 3.
- a fuel addition valve 5 for adding fuel to the exhaust is provided in the exhaust passage 2 upstream of the filter 3.
- the internal combustion engine 1 configured as described above is provided with an electronic control unit (ECU) 10 for controlling the internal combustion engine 1.
- the ECU 10 is a unit that controls the operation state of the internal combustion engine 1 in accordance with the operation conditions of the internal combustion engine 1 and the demands of the driver.
- the ECU 10 includes an exhaust differential pressure sensor 9, an exhaust temperature sensor 7, a crank position sensor 11 that outputs an electric signal corresponding to the crank angle of the internal combustion engine 1, and an accelerator that outputs an electric signal corresponding to the accelerator opening.
- the opening sensor 12 is electrically connected to a clutch switch 13 that outputs an electrical signal corresponding to the state of the clutch. These output signals are input to the ECU 10. Then, the ECU 10 estimates the amount of accumulated PM in the fineletter 3 from the output value of the exhaust differential pressure sensor 9.
- the exhaust differential pressure sensor 9 constitutes the PM accumulation amount estimating means according to the present invention.
- the ECU 10 estimates the temperature of the filter 3 from the output value of the exhaust temperature sensor 7. Further, the ECU 10 is electrically connected to the throttle valve 8 and the fuel addition valve 5, and these are controlled by the ECU 10.
- the ECU 10 when PM equal to or greater than the specified PM accumulation amount is accumulated in the filter 3, the ECU 10 reduces the opening of the throttle valve 8 and adds fuel into the exhaust gas from the fuel addition valve 5.
- the temperature of the filter 3 was raised to the target temperature and deposited on the filter 3 Execute filter regeneration control to oxidize and remove PM.
- the throttle valve 8 and the fuel addition valve 5 constitute filter regeneration control execution means according to the present invention.
- the fuel added from the fuel addition valve 5 is oxidized in the oxidation catalyst 6, and the temperature of the exhaust gas flowing into the filter 3 rises due to the oxidation heat generated at this time. As the exhaust gas temperature rises, the temperature of the filter 3 rises. Further, by reducing the opening of the throttle valve 8, the exhaust flow rate can be reduced, and as a result, the temperature of the exhaust gas flowing into the filter 3 can be easily increased. Therefore, in this embodiment, the temperature of the filter 3 is adjusted to the target temperature by controlling the amount of fuel added from the fuel addition valve 5 and the opening of the throttle valve 8.
- the target temperature is a temperature at which PM deposited on the filter 3 can be oxidized and removed, and a melting loss and excessive deterioration of the filter 3 can be suppressed.
- the PM in the filter 3 is determined based on the integrated value of the fuel injection amount in the internal combustion engine 1, the elapsed time since the start of the filter regeneration control, and the like. The amount of deposition may be estimated.
- filter overheating suppression control that suppresses overheating of the filter 3 is performed when the operating state of the internal combustion engine 1 becomes idling while the filter regeneration control is being executed.
- This routine is stored in advance in E C U 10, and is a routine that is executed each time the crankshaft rotates a specified angle during the operation of the internal combustion engine 1.
- ECU 10 first executes filter regeneration control in S 1 0 1. It is determined whether or not. If an affirmative determination is made in S101, the ECU 10 proceeds to S102, and if a negative determination is made, the ECU 10 ends the execution of this routine.
- the ECU 10 that performs processing for determining whether or not the operating state of the internal combustion engine 1 has shifted to idling based on the engine speed and the engine load of the internal combustion engine 1 is the idling detection means according to the present invention. Configure. If an affirmative determination is made in S102, the ECU 10 proceeds to S103, and if a negative determination is made, the ECU 10 once terminates execution of this routine. Here, when the execution of this routine is finished, the filter regeneration control is continued.
- the ECU 10 estimates the current PM accumulation amount Q p in the filter 3.
- the ECU 10 proceeds to S104, and calculates the lower limit rotation speed Nr that allows regeneration to continue based on the PM accumulation amount Qp.
- the lower limit rotation speed N r that can be regenerated is a value that is equal to or greater than the normal idle rotation speed, and even if the operating state of the internal combustion engine 1 becomes idling, the filter 3 is suppressed while suppressing excessive temperature rise. This is the lower limit of the idle speed that can secure an exhaust flow rate that allows regeneration control to continue.
- the relationship with the lower limit rotation speed Nr that can be regenerated is stored in advance in the ECU 10 as a map based on the PM accumulation amount Qp.
- the lower limit rotation speed Nr at which regeneration can be continued decreases as the PM accumulation amount Q decreases, and increases as the PM accumulation amount QP increases.
- the ECU 10 that performs the process of calculating the lower limit rotation speed N r that can be reproduced from this map is related to the present invention.
- the lower limit rotational speed calculation means that can continue playback is configured.
- the ECU 10 proceeds to S 105, and determines whether or not the regeneration possible lower limit rotation speed N r is higher than the upper limit value N l imit of the idle rotation speed.
- the upper limit value N 1 imit of the idle speed is a threshold value that can be determined that the idle speed is excessively high when the idle speed is higher than the upper limit value N limit, that is, the idle speed is the upper limit value N 1 imit. If it is below, it will be within the allowable range for deterioration of fuel consumption and emissions.
- the upper limit value N 1 imit of this idle speed is determined in advance by experiments or the like and stored in the ECU 10. S 1
- the ECU 10 proceeds to MiS 106. If a negative determination is made, the ECU 10 proceeds to S107.
- the ECU 10 having proceeded to S106 stops the execution of the filter regeneration control, and ends the execution of this routine.
- the ECU 10 that has proceeded to S107 adjusts the engine speed of the internal combustion engine 1 to the lower limit rotation speed Nr at which regeneration can be continued, and continues to execute the filter regeneration control. Thereafter, the ECU 10 once terminates execution of this routine. '
- the regeneration-remaining lower limit rotational speed Nr is the upper limit value of the idle rotational speed. If it is higher than N 1 imit, execution of filter regeneration control is stopped. As a result, not only the excessive temperature rise of the filter 3 but also an excessive increase in the idle speed can be suppressed.
- the regeneration-remaining lower limit speed Nr is the upper limit value of the idle speed N1
- the engine speed of the internal combustion engine 1 is adjusted to the lower limit rotation speed Nr at which regeneration can be continued, and the filter regeneration control is continued.
- Nr the lower limit rotation speed
- the filter regeneration control is continued.
- the lower limit rotation speed Nr at which regeneration can be continued becomes lower as the PM accumulation amount is smaller. Therefore, if the PM accumulation amount is reduced to some extent by promoting the removal of PM oxidation after the start of the filter regeneration control, the lower limit rotation speed that allows regeneration to continue when the operating state of the internal combustion engine 1 becomes idling. N r becomes a value less than the upper limit value NI imit of the idling speed, and filter regeneration control is continued. In other words, the filter regeneration control can be facilitated more easily by changing the lower limit rotation speed N r that can be regenerated as described above based on the PM accumulation amount.
- the regeneration-remaining lower limit rotational speed Nr is the upper limit value of the idle rotational speed N. If the engine speed is less than or equal to the limit, the engine speed of the internal combustion engine 1 is adjusted to a value equal to or lower than the upper limit value N limit of the idling engine speed and the lower limit engine speed Nr that can be regenerated, and the filter regeneration control is continued. good.
- the filter regeneration control can be promoted while suppressing the excessive temperature rise of the filter 3 and the excessive increase in the idle speed.
- the filter regeneration control when the filter regeneration control is being executed and the execution of the filter regeneration control is stopped when the operating state of the internal combustion engine 1 becomes idling, the engine rotation of the internal combustion engine 1 is further stopped.
- the number may be adjusted to be higher than the normal idle speed. However, even in this case, adjustment is made within the range of the upper limit value of idle speed N 1 imit.
- the specified PM accumulation amount which is the threshold value for starting execution of filter regeneration control
- the filter regeneration control execution interval can be made longer. That is, the execution frequency of filter regeneration control can be reduced. Therefore, it is possible to suppress deterioration of fuel consumption and emission due to execution of filter regeneration control.
- the specified PM deposition amount that is a threshold value for starting execution of filter regeneration control is changed according to the idling frequency.
- a method for setting the prescribed PM deposition amount according to this embodiment will be described.
- the period during which the execution of the filter regeneration control is stopped when the operation state of the internal combustion engine 1 becomes idling during the execution of the filter regeneration control is shortened as the idling frequency increases. I can do it. As a result, even when idling frequency is high, the frequency at which execution of filter regeneration control is stopped can be suppressed. As a result, the oxidation and removal of PM deposited on the filter 3 can be promoted.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (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 |
---|---|---|---|
EP05785867A EP1790837A1 (en) | 2004-09-14 | 2005-09-14 | Exhaust emission control system of internal combustion engine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-267237 | 2004-09-14 | ||
JP2004267237A JP4003768B2 (ja) | 2004-09-14 | 2004-09-14 | 内燃機関の排気浄化システム |
Publications (1)
Publication Number | Publication Date |
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WO2006030973A1 true WO2006030973A1 (ja) | 2006-03-23 |
Family
ID=36060208
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/017536 WO2006030973A1 (ja) | 2004-09-14 | 2005-09-14 | 内燃機関の排気浄化システム |
Country Status (3)
Country | Link |
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EP (1) | EP1790837A1 (ja) |
JP (1) | JP4003768B2 (ja) |
WO (1) | WO2006030973A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112709646A (zh) * | 2019-10-25 | 2021-04-27 | 迪尔公司 | 超低怠速管理 |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4665924B2 (ja) * | 2007-03-16 | 2011-04-06 | トヨタ自動車株式会社 | 内燃機関の排気浄化システム |
JP5284228B2 (ja) * | 2009-09-07 | 2013-09-11 | 本田技研工業株式会社 | 排気浄化装置 |
JP5614996B2 (ja) * | 2010-01-28 | 2014-10-29 | 三菱重工業株式会社 | 内燃機関の排気ガス処理方法及び装置 |
CN102884288B (zh) * | 2010-05-07 | 2015-06-17 | 洋马株式会社 | 排气净化系统 |
JP5533259B2 (ja) * | 2010-05-25 | 2014-06-25 | いすゞ自動車株式会社 | 排気ガス浄化システム |
JP5548882B2 (ja) * | 2010-08-27 | 2014-07-16 | 日立建機株式会社 | 作業車両の排気ガス浄化システム |
JP5235229B2 (ja) | 2011-07-04 | 2013-07-10 | 株式会社小松製作所 | 粒子状物質除去フィルタの再生制御装置およびその再生制御方法 |
WO2014073052A1 (ja) * | 2012-11-07 | 2014-05-15 | 三菱重工業株式会社 | 内燃機関の排ガス浄化装置 |
JP6136994B2 (ja) * | 2014-03-05 | 2017-05-31 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
KR101575513B1 (ko) * | 2014-08-04 | 2015-12-08 | 현대자동차주식회사 | Dpf 필터의 내구성 향상을 위한 재생 유지방법 및 그 제어 시스템. |
EP4134536A4 (en) * | 2020-04-08 | 2023-02-22 | NISSAN MOTOR Co., Ltd. | VEHICLE CONTROL METHOD AND VEHICLE CONTROL DEVICE |
CN112922699B (zh) * | 2021-03-01 | 2022-06-28 | 潍柴动力股份有限公司 | 一种dpf再生方法、装置及发动机 |
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- 2004-09-14 JP JP2004267237A patent/JP4003768B2/ja not_active Expired - Fee Related
-
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- 2005-09-14 EP EP05785867A patent/EP1790837A1/en not_active Withdrawn
- 2005-09-14 WO PCT/JP2005/017536 patent/WO2006030973A1/ja active Application Filing
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JPH08165918A (ja) * | 1994-12-15 | 1996-06-25 | Toyota Motor Corp | パティキュレート捕集システム制御方法 |
JP2002227677A (ja) * | 2001-01-31 | 2002-08-14 | S & S Engineering:Kk | ディーゼル・エンジンシステム |
JP2004190667A (ja) * | 2002-11-28 | 2004-07-08 | Denso Corp | 内燃機関の排気浄化装置 |
JP2004204774A (ja) * | 2002-12-25 | 2004-07-22 | Nissan Motor Co Ltd | 内燃機関の排気浄化装置 |
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CN112709646A (zh) * | 2019-10-25 | 2021-04-27 | 迪尔公司 | 超低怠速管理 |
CN112709646B (zh) * | 2019-10-25 | 2024-05-10 | 迪尔公司 | 超低怠速管理 |
Also Published As
Publication number | Publication date |
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EP1790837A1 (en) | 2007-05-30 |
JP2006083726A (ja) | 2006-03-30 |
JP4003768B2 (ja) | 2007-11-07 |
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