US10385747B2 - Exhaust gas purification system for internal combustion engine, internal combustion engine, and exhaust gas purification method for internal combustion engine - Google Patents

Exhaust gas purification system for internal combustion engine, internal combustion engine, and exhaust gas purification method for internal combustion engine Download PDF

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US10385747B2
US10385747B2 US15/549,137 US201615549137A US10385747B2 US 10385747 B2 US10385747 B2 US 10385747B2 US 201615549137 A US201615549137 A US 201615549137A US 10385747 B2 US10385747 B2 US 10385747B2
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exhaust gas
temperature
control
internal combustion
combustion engine
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US20180023435A1 (en
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Daiji Nagaoka
Teruo Nakada
Takayuki Sakamoto
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Isuzu Motors Ltd
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Isuzu Motors Ltd
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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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
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    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
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    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • F01N3/0885—Regeneration of deteriorated absorbents or adsorbents, e.g. desulfurization of NOx traps
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    • 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
    • F01N3/103—Oxidation catalysts for HC and CO only
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    • 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
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    • F01N9/00—Electrical control of exhaust gas treating apparatus
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    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/04—Exhaust treating devices having provisions not otherwise provided for for regeneration or reactivation, e.g. of catalyst
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • 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
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
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    • 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
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    • 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
    • F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
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    • 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
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • F01N2900/1402—Exhaust gas composition
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    • 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
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    • F01N2900/1404—Exhaust gas temperature
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    • 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
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    • 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
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    • 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
    • F02D2200/0802—Temperature of the exhaust gas treatment apparatus
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    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • 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
    • F02D41/0275—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 NOx trap or adsorbent
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    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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    • 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
    • F02D41/0275—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 NOx trap or adsorbent
    • F02D41/028—Desulfurisation of NOx traps or adsorbent
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    • 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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    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
    • F02D41/1441—Plural sensors
    • 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
    • Y02T10/24—
    • 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
    • Y02T10/47—

Definitions

  • the present invention relates to an exhaust gas purification system for an internal combustion engine, an internal combustion engine, and an exhaust gas purification method for the internal combustion engine which can avoid a lack of temperature increment of each catalyst device, an overshooting at the time of increasing a temperature, heat degradation of a catalyst, erosion of the catalyst so as to perform the regeneration processing reliably when each catalyst device including an exhaust gas purification device of the internal combustion engine performs regeneration processing.
  • an exhaust gas purification system which includes an exhaust gas purification device which has catalyst devices such as an oxidation catalyst, a device (DOC), a particulate collection device (CSF, SCRF, and the like), a selective reduction catalyst (SCR) device, and a lean NOx trap catalyst device (LNT) to purify purification object components such as hydrocarbon (HC), carbon monoxide (CO), particulate substance (PM), and nitrogen oxide (NOx) included in exhaust gases of the internal combustion engine such as a diesel engine.
  • catalyst devices such as an oxidation catalyst, a device (DOC), a particulate collection device (CSF, SCRF, and the like), a selective reduction catalyst (SCR) device, and a lean NOx trap catalyst device (LNT) to purify purification object components such as hydrocarbon (HC), carbon monoxide (CO), particulate substance (PM), and nitrogen oxide (NOx) included in exhaust gases of the internal combustion engine such as a diesel engine.
  • catalyst devices such as an oxidation catalyst, DOC),
  • a temperature-rising control of the exhaust gas is regularly performed for the release and the reduction (NOx regeneration) of NOx stored in the lean NOx trap catalyst device, the combustion-removal (PM regeneration) of the particulate substance collected in the particulate collection device, the removal (sulfur purge) of the sulfur component accumulated in various catalyst devices such as an oxidation catalyst device or the lean NOx trap catalyst device, and the like.
  • a detection temperature of an exhaust gas temperature sensor provided in the vicinity of any one catalyst device in the catalyst devices, and the estimation temperature of any one catalyst device obtained by following methods are set as a control temperature which is a control value of a feedback control with respect to a target temperature of the exhaust gas in the temperature-rising control.
  • a control temperature which is a control value of a feedback control with respect to a target temperature of the exhaust gas in the temperature-rising control.
  • an exhaust gas purification device which includes a selective reduction catalyst, a particulate filter which is arranged on the exhaust gas upstream side from the selective reduction catalyst and in which an oxidation catalyst layer is formed to further collect the particulate in the exhaust gas, a liquid injection nozzle through which the hydrocarbon based liquid can be injected toward the particulate filter, and a liquid feeding unit which supplies the liquid to the liquid injection nozzle.
  • the temperature of the exhaust gas relating to the particulate filter is detected using a temperature sensor, and the liquid feeding unit is controlled on the basis of a detection output of the temperature sensor.
  • a place (catalyst device) in which the heat generation amount is largest in the exhaust passage may be different according to an operating condition of the engine.
  • the oxidation catalyst device, the lean NOx trap catalyst device, and the particulate collection device when an excess air ratio ⁇ in the exhaust gas is high, and the concentration of the oxygen is high, the most hydrocarbon is combusted by the oxidation catalyst device on the upstream side to generate beat.
  • the temperature of each catalyst device is increased not by the generation of the combustion heat of the hydrocarbon, but by the heat transmission of the exhaust gas of which the temperature is increased by the oxidation catalyst device.
  • the combustion of the hydrocarbon is caused using the oxygen adsorbed in the lean NOx trap catalyst device or the oxygen generated by NOx reduction, and thus the generation amount of the combustion heat of the hydrocarbon in the lean NOx trap catalyst device is larger than that in the oxidation catalyst device.
  • S purge sulfur purge
  • Patent Literature 1 Japanese Unexamined Patent Application Publication No. 2013-174203
  • the present inventor found, through tests, such a relation between the change of the catalyst device in which a heat generation amount is largest in an exhaust passage and an increased degree of temperature is high and the oxygen concentration of the exhaust gas when the operating condition of the engine is changed. For example, a phenomenon is found in which at the time of the PM regeneration processing or the high load of the engine in which the excess air ratio in the exhaust gas is high and the oxygen concentration is high, the heat generation amount of the oxidation catalyst device is large, and on the other hand, at the time of the sulfur purge control or the low load of the engine in which the excess air ratio in the exhaust gas is low, and the oxygen concentration is low, the heat generation amount of the lean NOx trap catalyst device is large.
  • a position of the control temperature in the feedback control in other words, the catalyst device relating to the control temperature to be the target temperature is selected and changed in consideration of the oxygen concentration of the exhaust gas. That is, preferably, the catalyst device relating to the control temperature, in other words, a position where the control temperature is measured is changed on the basis of the oxygen concentration of the exhaust gas.
  • the control temperature relating to the temperature of the former oxidation catalyst device may be adopted, and when the excess air ratio or the oxygen concentration is low, the control temperature relating to the temperature of the lean NOx trap catalyst device may be adopted.
  • the measurement temperature relating to the temperature of the former oxidation catalyst device and the measurement temperature relating to the temperature of the lean NOx trap catalyst device are weighted (target temperature ratio), the weight is gradually changed according to the excess air ratio or the oxygen concentration, the control temperature is calculated on the basis of a weighted average thereof, and the temperature-rising control is performed at the feedback control such that the control temperature becomes the target temperature.
  • the present invention has been made in consideration of the above situation, and an object thereof is to provide an exhaust gas purification system for an internal combustion engine, an internal combustion engine, and an exhaust gas purification method for the internal combustion engine in which during the temperature-rising control of the exhaust gas for recovering an exhaust gas purification ability of the catalyst device, a lack of temperature increment of catalyst devices, an overshooting at the time of increasing a temperature, heat degradation of a catalyst, and erosion of the catalyst can be avoided using the exhaust gas purification system for the internal combustion engine which includes an oxidation catalyst device on an upstream side and a lean NOx trap catalyst device on a downstream side in an exhaust passage of the internal combustion engine, thereby performing a regeneration processing reliably.
  • an exhaust gas purification system for an internal combustion engine includes an oxidation catalyst device on an upstream side in an exhaust passage of an internal combustion engine and a lean NOx trap catalyst device on a downstream side, and a controller which controls the exhaust gas purification system is configured to, when a temperature-rising control of an exhaust gas in a regeneration control is performed to recover a purification ability of the exhaust gas purification system, perform a control that changes a measurement position of a control temperature which is a control amount of a feedback control in the temperature-rising control, according to an excess air ratio or an oxygen concentration of the exhaust gas passing through the exhaust passage.
  • the measurement position of the control temperature which is the control amount of the feedback control in the temperature-rising control, that is, the control temperature to be a target temperature is changed and set in consideration of the oxygen concentration of the exhaust gas, and more specifically, the control temperature is set to the temperature relating to the catalyst device in which the heat generation amount is largest at that time in the exhaust gas purification system and the temperature is increased most, whereby the temperature-rising control of the exhaust gas can be optimized. Therefore, the lack of temperature increment of each of the catalyst devices, the overshooting at the time of increasing a temperature, the heat degradation of the catalyst, and the erosion of the catalyst can be avoided so that the regeneration processing can be performed reliably.
  • the above-described exhaust gas purification system for the internal combustion engine further includes: a first temperature sensor which measures a first temperature relating to a temperature of the oxidation catalyst device; and a second temperature sensor which measures a second temperature relating to a temperature of the lean NOx trap catalyst device, and the controller is configured to, when the temperature-rising control of the exhaust gas in the regeneration control is performed to recover the purification ability of the exhaust gas purification system, perform a control such that the control temperature is set as the first temperature when the excess air ratio or the oxygen concentration of the exhaust gas passing through the exhaust passage is higher than an upper limit threshold set in advance, and the control temperature is set as the second temperature when the excess air ratio or the oxygen concentration of the exhaust gas passing through the exhaust passage is lower than a lower limit threshold set in advance, thereby obtaining following effect.
  • the first temperature relating to the oxidation catalyst device is set as the control temperature, so that the temperature-rising control can be performed at the temperature of the oxidation catalyst device.
  • the excess air ratio and the oxygen concentration of the exhaust gas is lower than the lower limit threshold set in advance.
  • the second temperature relating to the lean NOx trap catalyst device is set as the control temperature, so that the temperature-rising control can be performed at the temperature of the lean NOx trap catalyst device. Therefore, the temperature-rising control of the exhaust gas can be optimized with the relatively simple control.
  • the controller when the temperature-rising control of the exhaust gas in the regeneration control is performed to recover the purification ability of the exhaust gas purification system, when the excess air ratio or the oxygen concentration of the exhaust gas passing through the exhaust passage is equal to or less than the upper limit threshold and equal to or more than the lower limit threshold, the controller performs a control to set the weight coefficient to be changed according to the excess air ratio or the oxygen concentration of the exhaust gas passing through the exhaust passage, and to set the control temperature to a weighted average value of the first temperature and the second temperature using the weight coefficient. Therefore, the temperature-rising control can be performed while a drastic change due to the switch of the control temperature with respect to the change of the excess air ratio or the oxygen concentration is avoided.
  • the internal combustion engine of the present invention to achieve the above-described object includes the above-described exhaust gas purification system for the internal combustion engine, so as to make the same operational effect as that of the above-described exhaust gas purification system for the internal combustion engine.
  • the exhaust gas purification system for the internal combustion engine, the internal combustion engine, and the exhaust gas purification method for the internal combustion engine in the present invention at time of the temperature-rising control of the exhaust gas for performing the regeneration processing on the catalyst devices included in the exhaust gas purification device, the measurement position of the control temperature which is the control amount of the feedback control in the temperature-rising control, that is, the control temperature to be a target temperature is changed and set in consideration of the oxygen concentration of the exhaust gas, and more specifically, the control temperature is set to the temperature relating to the catalyst device in which the heat generation amount is largest at that time in the exhaust gas purification system and the temperature is increased most, thereby optimizing the temperature-rising control of the exhaust gas. Therefore, it is possible to avoid a lack of temperature increment of each of the catalyst devices, an overshooting at the time of increasing a temperature, heat degradation of the catalyst, and erosion of the catalyst, and it is possible to perform the regeneration processing reliably.
  • FIG. 1 is a view schematically illustrating a configuration of an internal combustion engine which includes an exhaust gas purification system for an internal combustion engine of an embodiment according to the present invention.
  • FIG. 2 is a view schematically illustrating a relation between a weight coefficient which is a weight ratio of a first temperature to a second temperature and an excess air ratio of the exhaust gas.
  • the internal combustion engine of the embodiment according to the present invention includes an exhaust gas purification system for an internal combustion engine of the embodiment according to the present invention, so as to make the same operational effect as an operational effect made by the exhaust gas purification system for the internal combustion engine (to be described later).
  • the engine 10 are provided with a fuel injection device 11 , an intake valve 12 , and an exhaust valve 13 facing a cylinder 10 a , and further with an intake passage 14 communicating with the intake valve 12 , an exhaust passage 15 communicating with the exhaust valve 13 , and an EGR passage 16 .
  • the intake passage 14 is provided with an air cleaner 17 , a compressor 18 b of a turbocharger (turbo type supercharger) 18 , an intercooler 19 a , and an intake throttle valve 19 b in order from the upstream side.
  • the exhaust passage 15 is provided with a turbine 18 a of the turbocharger 18 and an exhaust gas purification device 21 in order from the upstream side.
  • the EGR passage 16 is provided by connecting the intake passage 14 on the downstream from the compressor 18 b with the exhaust passage 15 on the upstream from the turbine 18 a .
  • the EGR passage 16 is provided with an EGR cooler 16 a , an EGR valve 16 b in order from the upstream side.
  • new air A guided from the atmosphere is fed to the cylinder (cylinder) 10 a through the intake valve 12 in association with the exhaust gas (EGR gas) Ge flowing in the intake passage 14 from the EGR passage 16 .
  • the exhaust gas G generated in the cylinder 10 a flows out to the exhaust passage 15 through the exhaust valve 13 .
  • Some of the exhaust gas G flows to the EGR passage 16 as the EGR gas Ge.
  • the exhaust gas purification device 21 of the exhaust gas purification system 20 includes catalyst devices such as an oxidation catalyst (DOC) device 22 , a particulate collection device (CSF) 23 , a lean NOx trap catalyst device (LNT) 24 , and a subsequent-stage oxidation catalyst (DOC) device 25 .
  • the catalyst devices may be provided in the exhaust gas purification device 20 in the reverse order to the arrangement order of the particulate collection device 23 and the lean NOx trap catalyst device 24 , that is, in order of the oxidation catalyst device 22 , the lean NOx trap catalyst device 24 , the particulate collection device 23 , and the subsequent-stage oxidation catalyst device 25 .
  • the fuel injection device 26 which injects the unburned fuel into the exhaust passage 15 is arranged in the exhaust passage 15 on the upstream side of the oxidation catalyst device 22 .
  • the unburned fuel is injected into the exhaust passage 15 at the time of the temperature-rising control of the exhaust gas such as a NOx regeneration control on the lean NOx trap catalyst device 24 , a sulfur purge control on the oxidation catalyst device 22 and the lean NOx trap catalyst device 24 , and a PM regeneration control on the particulate collection device 23 .
  • the hydrocarbon which is an unburned fuel is oxidized by the oxidation catalyst device 22 and the like, and by oxidation heat, the temperature of the exhaust gas Ga is increased.
  • the temperature of the lean NOx trap catalyst device 24 is increased to a temperature range of the release and the reduction of the occlusion NOx, the temperature of the particulate collection device 23 is increased such a temperature range that can realize the PM combustion, or the temperatures of the oxidation catalyst device 22 and the lean NOx trap catalyst device 24 are increased to such a temperature range that can realize desulfurization. In this manner, the exhaust gas purification ability of the catalyst devices 22 , 23 , and 24 are recovered.
  • the first temperature sensor 31 which detects the temperature TDOC of the exhaust gas Ga flowing in the oxidation catalyst device 22 is arranged in the exhaust passage 15 on the upstream side (inlet side) of the oxidation catalyst device 22 .
  • the second temperature sensor 32 which detects a temperature TLNT of the exhaust gas Ga flowing in the lean NOx trap catalyst device 24 is arranged in the exhaust passage 15 on the upstream side of the lean NOx trap catalyst device 24 .
  • the third temperature sensor 33 which detects the temperature TCSF of the exhaust gas Ga flowing out from the oxidation catalyst device 22 to flow in the particulate collection device 23 is arranged in the exhaust passage 15 between the oxidation catalyst device 22 and the particulate collection device 23 .
  • a ⁇ -sensor 34 which measures the excess air ratio ⁇ of the exhaust gas Ga or an oxygen concentration Co or an oxygen concentration sensor (not illustrated) is arranged on the downstream side of the exhaust gas purification device 20 .
  • the ⁇ -sensor or the oxygen concentration sensor may be arranged on the upstream side of the exhaust gas purification device 20 , or may be arranged in an exhaust manifold.
  • the temperature TDOC detected by the first temperature sensor 31 is set as a first temperature T 1 relating to the oxidation catalyst device 22 .
  • the temperature TLNT detected by the second temperature sensor 32 is set as a second temperature T 2 relating to the lean NOx trap catalyst device 24 .
  • the temperature TCSF detected by the third temperature sensor 33 is set as a third temperature T 3 relating to the particulate collection device 23 .
  • the average value of the temperatures detected by the temperature sensors before and after the oxidation catalyst device 22 may be set as the first temperature T 1 .
  • the average value of the temperatures detected by the temperature sensors before and after the lean NOx trap catalyst device 24 may be set as the second temperature T 2 .
  • the average value of the temperatures detected by the temperature sensors before and after the particulate collection device 23 may be set as the third temperature.
  • the exhaust gas temperatures on the upstream side of the catalyst devices 22 , 23 , and 24 instead of the exhaust gas temperatures on the respective downstream sides may be used.
  • a controller 40 is provided which controls the exhaust gas purification system 20 of the internal combustion engine of the present invention. Normally, the controller 40 is configured to be embedded in an engine control unit (ECU) which controls the whole operating condition of the engine 10 , but may be configured separately.
  • ECU engine control unit
  • the controller 40 which controls the exhaust gas purification system 20 performs a control to change the measurement position of the control temperature Tc which is the control amount of the feedback control in the temperature-rising control, according to the excess air ratio ⁇ or the oxygen concentration Co of the exhaust gas G passing through the exhaust passage 15 .
  • the amount of the unburned fuel (hydrocarbon) injected by the fuel injection device 26 is adjusted such that the control temperature Tc becomes a target temperature Tm set according to each regeneration processing.
  • the measurement position of the control temperature Tc is changed according to the excess air ratio ⁇ or the oxygen concentration Co of the exhaust gas Ga.
  • the measurement position is changed to the measurement temperature which reflects best the temperature (any one of T 1 , T 2 , and T 3 ) of the catalyst device (any one of 22 , 23 , and 24 ) in which the heat generation amount is largest at that time in the exhaust passage 15 and the temperature is increased most.
  • the controller 40 performs a control such that the control temperature Tc is set as the first temperature T 1 when the excess air ratio ⁇ or the oxygen concentration Co of the exhaust gas Ga passing through the exhaust passage 15 is higher than an upper limit threshold A 1 set in advance, and the control temperature Tc is set as the second temperature T 2 when the excess air ratio ⁇ or the oxygen concentration Co is lower than a lower limit threshold A 2 set in advance.
  • the upper limit threshold A 1 and the lower limit threshold A 2 are set in advance by the experiments and the like, and are stored in the controller 40 .
  • the upper limit threshold A 1 and the lower limit threshold A 2 may be set the same as each other, and in this case, the first temperature T 1 and the second temperature T 2 preferably become the substantially same value.
  • the excess air ratio ⁇ and the oxygen concentration Co of the exhaust gas Ga is larger than the upper limit threshold A 1 .
  • the first temperature T 1 relating to the oxidation catalyst device 22 is set as the control temperature Tc, and the temperature-rising control can be performed at the first temperature T 1 of the oxidation catalyst device 22 .
  • the excess air ratio ⁇ and the oxygen concentration Co of the exhaust gas Ga is lower than the lower limit threshold A 2 set in advance.
  • the second temperature T 2 relating to the lean NOx trap catalyst device 24 is set as the control temperature Tc, and the temperature-rising control can be performed at the second temperature T 2 of the lean NOx trap catalyst device 24 . Therefore, the temperature-rising control of the exhaust gas Ga can be optimized with the relatively simple control.
  • the controller 40 performs a control to set a weight coefficient ⁇ to be changed according to the excess air ratio ⁇ or the oxygen concentration Co, and to set the control temperature Tc to a weighted average value T 12 of the first temperature T 1 and the second temperature T 2 using the weight coefficient ⁇ . In this manner, the temperature-rising control can be performed while a drastic change due to the switch of the control temperature Tc with respect to the change of the excess air ratio ⁇ or the oxygen concentration Co is avoided.
  • the number of the temperatures of the catalyst device as a maximum heat generation amount is three or more, for example, in the case of TDOC, TLNT, and TCSF
  • the number of the weight coefficient is increased, and a temperature as the control temperature Tc is obtained as a weighted average.
  • the exhaust gas purification system 20 of the internal combustion engine, the internal combustion engine 10 , and the exhaust gas purification method for the internal combustion engine which are described above, at time of the temperature-rising control of the exhaust gas Ga for performing the regeneration processing on the catalyst devices 22 , 23 , and 24 included in the exhaust gas purification device 21 , the measurement position of the control temperature Tc which is the control amount of the feedback control in the temperature-rising control, that is, the control temperature Tc to be the target temperature Tm is changed and set in consideration of the excess air ratio ⁇ or the oxygen concentration Co of the exhaust gas Ga, and more specifically, the control temperature Tc is set to the temperatures T 1 , T 2 , and T 3 relating to the catalyst devices 22 , 23 , and 24 in which the heat generation amount is largest at that time in the exhaust gas purification system 20 and the temperature is increased most, thereby optimizing the temperature-rising control of the exhaust gas Ga.

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  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
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JP2015-022016 2015-02-06
PCT/JP2016/052905 WO2016125738A1 (fr) 2015-02-06 2016-02-01 Système de purification des gaz d'échappement pour moteur à combustion interne, moteur à combustion interne et procédé de purification des gaz d'échappement pour un moteur à combustion interne

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CN107208521A (zh) 2017-09-26
JP2016145532A (ja) 2016-08-12
CN107208521B (zh) 2019-08-30
US20180023435A1 (en) 2018-01-25
EP3255258A1 (fr) 2017-12-13

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