WO2012077189A1 - 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
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- WO2012077189A1 WO2012077189A1 PCT/JP2010/071932 JP2010071932W WO2012077189A1 WO 2012077189 A1 WO2012077189 A1 WO 2012077189A1 JP 2010071932 W JP2010071932 W JP 2010071932W WO 2012077189 A1 WO2012077189 A1 WO 2012077189A1
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- internal combustion
- combustion engine
- light oil
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- purification device
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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
- F01N3/18—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 characterised by methods of operation; Control
- F01N3/20—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 characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
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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
- 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
- F01N11/005—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 the temperature or pressure being estimated, e.g. by means of a theoretical model
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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
- 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
- F01N13/0097—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 the purifying devices are arranged in a single housing
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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
- 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
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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
- F01N3/103—Oxidation catalysts for HC and CO only
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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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
- F01N3/18—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 characterised by methods of operation; Control
- F01N3/20—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 characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2033—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using a fuel burner or introducing fuel into exhaust duct
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- 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
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B7/00—Engines characterised by the fuel-air charge being ignited by compression ignition of an additional fuel
- F02B7/02—Engines characterised by the fuel-air charge being ignited by compression ignition of an additional fuel the fuel in the charge being liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B7/00—Engines characterised by the fuel-air charge being ignited by compression ignition of an additional fuel
- F02B7/06—Engines characterised by the fuel-air charge being ignited by compression ignition of an additional fuel the fuel in the charge being gaseous
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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
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
- F02D19/0642—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
- F02D19/0647—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
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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
- 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
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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
- 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
- F01N2900/1631—Heat amount provided to exhaust apparatus
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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
- F01N3/033—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 in combination with other devices
- F01N3/035—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 in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
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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
- F01N3/0828—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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02D19/0686—Injectors
- F02D19/0692—Arrangement of multiple injectors per combustion chamber
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- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
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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
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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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Definitions
- the present invention relates to an exhaust gas purification system for an internal combustion engine capable of mixing and burning liquid fuel and compressed natural gas.
- Patent Document 1 discloses an auxiliary fuel ignition type gas engine using light oil as an auxiliary fuel.
- auxiliary fuel ignition type gas engine light oil and natural gas are mixed and burned using light oil as an ignition source.
- Patent Document 1 describes a technique for supplying only light oil to the internal combustion engine at light loads and supplying light oil and natural gas to the internal combustion engines at medium and high loads.
- Patent Document 2 discloses a fuel injection control device that controls fuel injection into a cylinder of an internal combustion engine.
- the fuel injection control device includes a reducing agent supply means for supplying a reducing agent to the exhaust purification device.
- the reductant supply means is a fuel injector that injects fuel into the cylinder, after the main fuel injection, after the post-injection, and before the post-injection and before the post-injection, a small amount of pre-injection before the post-injection. Then, the reducing agent is supplied to the exhaust gas purification device.
- Patent Document 3 discloses that two or more of the oxygen concentration, CO concentration, and HC concentration of exhaust gas are used as control parameters when supplying the reducing agent into the exhaust gas flowing into the exhaust gas purification device. .
- the exhaust passage of the internal combustion engine is provided with an exhaust purification device having an oxidation function. Then, when raising the temperature of the exhaust purification device to regenerate the exhaust purification device, HC may be supplied to the exhaust purification device by the HC supply device. When HC is supplied to the exhaust gas purification device, the temperature of the exhaust gas purification device rises due to oxidation heat generated by oxidation of the HC.
- methane which is the main component of CNG, has very low ignitability and is difficult to burn. Therefore, when the liquid fuel and CNG are mixed and burned in the internal combustion engine, the amount of HC in the exhaust gas is greatly increased as compared with the case where only the liquid fuel is burned. Therefore, when liquid fuel and CNG are mixed and burned in the internal combustion engine, if HC is supplied to the exhaust purification device by the HC supply device in the same manner as when only liquid fuel is combusted, the total amount to the exhaust purification device is increased. As a result, the amount of HC supplied increases excessively, and as a result, the exhaust purification device may overheat.
- the present invention has been made in view of the above problems, and in an exhaust gas purification system for an internal combustion engine capable of mixing and burning liquid fuel and CNG, when the exhaust gas purification device is regenerated, the exhaust gas purification device is The purpose is to suppress overheating.
- the present invention relates to an HC supply device when the liquid fuel and the compressed natural gas are mixed and burned in the internal combustion engine when the exhaust purification device is regenerated, compared to when only the liquid fuel is burned in the internal combustion engine. This reduces the amount of HC supplied to the exhaust gas purification device.
- the exhaust gas purification system for an internal combustion engine is: An exhaust purification system for an internal combustion engine capable of mixing and burning liquid fuel and compressed natural gas, An exhaust purification device provided in an exhaust passage of an internal combustion engine and having an oxidation function; An HC supply device for supplying HC to the exhaust purification device when regenerating the exhaust purification device; When regenerating the exhaust purification device, when the internal combustion engine is mixed and burned with liquid fuel and compressed natural gas, compared to when only the liquid fuel is burned in the internal combustion engine and the operating state is the same, An HC supply amount control device for reducing the amount of HC supplied from the HC supply device to the exhaust gas purification device; Is provided.
- the HC supply amount control device calculates a first HC emission amount calculation unit that calculates a first HC emission amount that is an HC amount discharged from the internal combustion engine when only the liquid fuel is burned in the internal combustion engine. And a second HC emission amount calculation unit for calculating a second HC emission amount that is an HC amount discharged from the internal combustion engine when liquid fuel and CNG are mixed and burned in the internal combustion engine. Also good.
- the first HC emission amount can be calculated based on the operating state of the internal combustion engine. Further, when liquid fuel and CNG are mixed and burned in the internal combustion engine, the ratio between the supply amount of liquid fuel and the supply amount of CNG is determined based on the operating state of the internal combustion engine. Then, the second HC emission amount can be calculated based on the operating state of the internal combustion engine and the ratio of the liquid fuel supply amount and the CNG supply amount.
- the liquid fuel and CNG are mixed and burned in the internal combustion engine, compared with the case where only the liquid fuel is burned in the internal combustion engine and the operation state is the same.
- the HC amount supplied from the HC supply device to the exhaust gas purification device may be decreased by the difference between the first HC emission amount and the second HC emission amount. According to this, the exhaust gas purification device can be sufficiently regenerated while suppressing the excessive temperature rise of the exhaust gas purification device and the release of HC to the outside.
- an exhaust gas purification system for an internal combustion engine capable of mixing and burning liquid fuel and CNG
- the exhaust gas purification device when the exhaust gas purification device is regenerated, the exhaust gas purification device is prevented from being overheated. it can.
- FIG. 1 is a diagram showing a schematic configuration of an internal combustion engine and its fuel system and intake / exhaust system according to the present embodiment.
- the internal combustion engine 1 is a vehicle driving engine that can use light oil and CNG as fuel.
- the internal combustion engine 1 is a compression ignition type engine.
- the internal combustion engine 1 can be operated by mixing and burning light oil and CNG, and can also be operated by burning only light oil.
- the internal combustion engine 1 has four cylinders 2. Each cylinder 2 is provided with a light oil injector 8 that directly injects light oil into the cylinder 2. An intake manifold 4 and an exhaust manifold 5 are connected to the internal combustion engine 1. An intake passage 6 is connected to the intake manifold 4. An exhaust passage 7 is connected to the exhaust manifold 5. The four branch pipes of the intake manifold 4 are connected to the respective cylinders 2. Each branch pipe is provided with a CNG injector 9 for injecting CNG.
- Each light oil injector 8 is connected to a common rail 10 for light oil.
- One end of a light oil supply passage 12 is connected to the light oil common rail 10.
- the other end of the light oil supply passage 12 is connected to a light oil tank 13.
- a pump 14 is installed in the light oil supply passage 12. The pump 14 pumps the light oil from the light oil tank 13 through the light oil supply passage 12 to the light oil common rail 10. Then, the light oil pressurized in the light oil common rail 10 is supplied to each light oil injector 8.
- Each CNG injector 9 is connected to a delivery pipe 11 for CNG.
- One end of a CNG supply passage 15 is connected to the CNG delivery pipe 11.
- the other end of the CNG supply passage 15 is connected to the CNG tank 16.
- CNG is supplied from the CNG tank 16 to the CNG delivery pipe 11 through the CNG supply passage 15. Then, CNG is supplied from the CNG delivery pipe 11 to each CNG injector 9.
- a regulator 17 is installed in the CNG supply passage 15.
- the regulator 17 adjusts the pressure of the CNG supplied to the CNG delivery pipe 11.
- Pressure sensors 26 and 27 for detecting the pressure of CNG are provided on the upstream side of the regulator 17 in the CNG supply passage 15 and on the CNG delivery pipe 11.
- CNG is injected from the CNG injector 9 into the intake port, whereby a premixed gas of intake air and CNG is formed. And the light oil injected in the cylinder 2 from the light oil injector 8 becomes an ignition source, and light oil and CNG burn.
- an air cleaner 18, an air flow meter 25, and a throttle valve 19 are sequentially installed from the upstream side along the flow of fresh air.
- the exhaust manifold 5 is provided with a light oil addition valve 24 for adding light oil to the exhaust.
- An exhaust purification device 21 is installed in the exhaust passage 7.
- the exhaust purification device 21 includes an oxidation catalyst 22 provided on the upstream side and a particulate filter (hereinafter simply referred to as a filter) 23 provided on the downstream side.
- the filter 23 collects particulate matter (hereinafter referred to as PM) in the exhaust gas.
- the filter 23 carries an NOx storage reduction catalyst.
- the internal combustion engine 1 is provided with an electronic control unit (ECU) 20.
- An air flow meter 25 and pressure sensors 26 and 27 are electrically connected to the ECU 20.
- a crank angle sensor 28 and an accelerator opening sensor 29 are electrically connected to the ECU 20.
- the crank angle sensor 28 detects the crank angle of the internal combustion engine 1.
- the accelerator opening sensor 29 detects the accelerator opening of a vehicle on which the internal combustion engine 1 is mounted. Output signals from the sensors are input to the ECU 20.
- the ECU 20 calculates the engine speed of the internal combustion engine 1 based on the output signal of the crank angle sensor 28, and calculates the engine load of the internal combustion engine 1 based on the output signal of the accelerator opening sensor 29.
- the ECU 20 is electrically connected to a light oil injector 8, a CNG injector 9, a pump 14, a regulator 17, a throttle valve 19, and a light oil addition valve 24. These devices are controlled by the ECU 20.
- ECU20 selects either the mixed combustion of light oil and CNG, or the combustion of only light oil as the combustion form based on the driving
- a filter regeneration process for removing the PM deposited on the filter 23 and regenerating the filter 23 is performed.
- the filter regeneration process according to the present embodiment is realized by adding light oil into the exhaust gas from the light oil addition valve 24.
- HC When HC is supplied to the exhaust gas purification device 21 by adding light oil into the exhaust gas from the light oil addition valve 24, the HC is oxidized in the NOx storage reduction catalyst supported by the oxidation catalyst 22 and the filter 23.
- the temperature of the filter 23 rises to a target temperature at which PM can be oxidized by the oxidation heat, the PM deposited on the filter 23 is removed.
- step S101 it is determined whether or not the conditions for starting the filter regeneration process are satisfied.
- conditions for starting execution of the filter regeneration process include that the estimated value of the PM accumulation amount in the filter 23 is equal to or greater than a predetermined value, and that a predetermined time has elapsed since the previous execution of the filter regeneration process was completed. can do.
- the temperature of the filter 23 at the time of executing the filter regeneration process is controlled by controlling the amount of light oil added from the light oil addition valve 24 (that is, controlling the amount of HC supplied to the exhaust purification device 21). Therefore, when the filter regeneration process execution start condition is satisfied, the target light oil addition amount Qaddt from the light oil addition valve 24 is calculated (step S102). A specific method for calculating the target light oil addition amount Qaddt will be described later.
- step S103 the light oil addition amount Qadd from the light oil addition valve 24 is set to the target light oil addition amount Qaddt. Then, addition of light oil from the light oil addition valve 24 is executed (step S104), thereby starting execution of filter regeneration processing.
- HC discharged from the internal combustion engine 1 is supplied to the exhaust purification device 21.
- the HC is oxidized in the NOx storage reduction catalyst supported on the oxidation catalyst 22 or the filter 23 in the same manner as the HC supplied by adding light oil from the light oil addition valve 24. And the temperature of the filter 23 rises by the oxidation heat.
- the amount of HC discharged from the internal combustion engine 1 can be estimated based on the operating state of the internal combustion engine 1.
- methane (CH 4 ) which is the main component of CNG, is harder to burn than light oil. Therefore, assuming that the operating state of the internal combustion engine 1 is the same, when the internal combustion engine 1 is performing the mixed combustion of light oil and CNG, the internal combustion engine 1 is compared to when the internal combustion engine 1 is only burning the light oil. The amount of HC discharged from the water greatly increases.
- the filter regeneration process when the filter regeneration process is executed, when light oil and CNG are mixed and burned in the internal combustion engine 1, only the light oil is burned in the internal combustion engine 1 to be in the same operating state. Compared to the above, the amount of light oil added from the light oil addition valve 24 is decreased.
- FIG. 3 is a flowchart showing a calculation flow of the target light oil addition amount from the light oil addition valve 24 when the filter regeneration process according to the present embodiment is executed. This flow is stored in advance in the ECU 20, and is executed in step S102 of the flow shown in FIG.
- a required HC supply amount QRHC which is an amount of HC supplied to the exhaust purification device 21 required to raise the temperature of the filter 23 to the target temperature
- the required HC supply amount Q RHC is based on the difference between the temperature of the exhaust discharged from the internal combustion engine 1 (that is, the temperature of the filter 23 when it is assumed that HC is not supplied to the exhaust purification device 21) and the target temperature. Is calculated.
- the temperature of the exhaust discharged from the internal combustion engine 1 can be estimated based on the operating state of the internal combustion engine 1. Further, the temperature of the exhaust gas may be detected by a temperature sensor. The target temperature in the filter regeneration process is determined in advance based on experiments and the like. The relationship between the difference between the temperature of the exhaust discharged from the internal combustion engine 1 and the target temperature and the required HC supply amount QRHC can be obtained in advance based on experiments or the like. These relationships are stored in the ECU 20 as a map or function. In step S201, the required HC supply amount Q RHC can be calculated by substituting the difference between the exhaust gas temperature discharged from the internal combustion engine 1 and the target temperature into the function.
- step S202 it is determined whether or not the internal combustion engine 1 is operated by a mixed combustion of light oil and CNG (step S202).
- the first HC emission amount Q HC1 is calculated (step S203).
- the second HC emission amount Q HC2 is calculated (step S205).
- the first HC emission amount Q HC1 is the amount of HC discharged from the internal combustion engine 1 when only the light oil is burned in the internal combustion engine 1.
- the ECU 20 stores a relationship between the operating state of the internal combustion engine 1 and the first HC emission amount Q HC1 obtained as a result of an experiment or the like as a map or a function.
- the first HC emission amount Q HC1 is calculated by substituting the operating state of the internal combustion engine 1 into the map or function.
- the second HC emission amount Q HC2 is an HC amount discharged from the internal combustion engine 1 when light oil and CNG are mixed and burned in the internal combustion engine 1.
- the ratio between the light oil supply amount and the CNG supply amount is determined based on the operating state of the internal combustion engine 1.
- the ECU 20 stores a relationship between a ratio between the light oil supply amount and the CNG supply amount obtained through experiments and the operation state of the internal combustion engine 1 as a map or a function. In the map or function, the supply amount of light oil relative to the operating state of the internal combustion engine 1 so as to ensure combustion (mixed combustion) in the cylinder 2 while suppressing the supply amount of light oil as much as possible. And the CNG supply amount are determined.
- the ECU 20 stores, as a map or a function, a relationship between the operating state of the internal combustion engine 1, the ratio of the light oil supply amount and the CNG supply amount, and the second HC emission amount Q HC2, which are obtained through experiments or the like.
- the second HC emission amount Q HC2 is set to a larger amount than the first HC emission amount Q HC1 when the operation state of the internal combustion engine 1 is assumed to be the same.
- the second HC emission amount Q HC2 is calculated by substituting the operating state of the internal combustion engine 1 and the ratio of the light oil supply amount and the CNG supply amount to the map or function.
- the first HC discharge amount Q HC1 is subtracted from the required HC supply amount Q RHC, and the light oil addition amount corresponding to the subtracted value is the light oil addition valve 24.
- the second HC emission amount Q HC2 is subtracted from the required HC supply amount Q RHC, and the light oil addition amount corresponding to the subtracted value is the light oil addition amount.
- the target light oil addition amount Qaddt from the valve 24 is calculated (step S206).
- the target light oil addition amount Qaddt from the light oil addition valve 24 at the time of executing the filter regeneration process is a mixture combustion of light oil and CNG in the internal combustion engine 1
- the temperature of the filter 23 can be raised to the target temperature while obtaining these effects, the PM deposited on the filter 23 can be removed. That is, the filter 23 can be sufficiently regenerated. Furthermore, the consumption of light oil accompanying the execution of the filter regeneration process can be suppressed.
- the amount of HC supplied to the exhaust gas purification device 21 when the amount of HC supplied to the exhaust gas purification device 21 is adjusted, the amount of light oil added from the light oil addition valve 24 is increased or decreased. However, when adding light oil from the light oil addition valve 24 a plurality of times, the light oil addition amount itself from the light oil addition valve 24 at each time is not changed, but the execution interval of the light oil addition is changed, so that the exhaust purification device 21 can be changed.
- the amount of HC to be supplied may be adjusted. For example, if the execution interval of light oil addition from the light oil addition valve 24 is lengthened (if the execution suspension period of light oil addition is lengthened), the amount of HC supplied to the exhaust purification device 21 per unit time can be reduced. .
- control of the light oil addition amount from the light oil addition valve according to the present embodiment can be applied not only to the filter regeneration process but also to other processes involving the addition of the light oil from the light oil addition valve 24.
- the temperature of the filter 23 that is, the NOx storage reduction catalyst
- Temperature must be increased to a temperature at which SOx can be reduced.
- the control of the amount of light oil added from the light oil addition valve according to the present embodiment can also be applied to such SOx reduction treatment.
- the exhaust purification device 21 corresponds to the exhaust purification device according to the present invention.
- the configuration of the exhaust purification device according to the present invention is not limited to the configuration of the exhaust purification device 21.
- the exhaust emission control device according to the present invention may have any configuration as long as it has an oxidation function and is regenerated by being supplied with HC.
- the light oil addition valve 24 corresponds to the HC supply device according to the present invention.
- HC is supplied to the exhaust gas purification device 21 by performing sub-injection at a timing later than the main injection by the light oil injector 8. You can also.
- the sub injection amount by the light oil injector 8 is controlled in the same manner as the light oil addition amount from the light oil addition valve 24 described above.
- the light oil injector 8 that performs the sub-injection corresponds to the HC supply device according to the present invention.
- light oil corresponds to the liquid fuel according to the present invention.
- the liquid fuel according to the present invention is not limited to light oil.
- the present invention can also be applied to an internal combustion engine capable of performing combustion with gasoline, alcohol, or LPG and CNG.
- gasoline, alcohol, or LPG corresponds to the liquid fuel according to the present invention.
- the processing of steps S102 and S103 of the flow shown in FIG. 2 and the ECU 20 that executes the flow shown in FIG. 3 correspond to the HC supply amount control device according to the present invention.
- the ECU 20 that executes the process of step S203 in the flow shown in FIG. 3 corresponds to the first HC emission amount calculation unit according to the present invention.
- the ECU 20 that executes the process of step S205 of the flow shown in FIG. 3 corresponds to the second HC emission amount calculation unit according to the present invention.
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Abstract
Description
液体燃料と圧縮天然ガスとを混合燃焼することが可能な内燃機関の排気浄化システムであって、
内燃機関の排気通路に設けられ、酸化機能を有する排気浄化装置と、
前記排気浄化装置を再生させる際に前記排気浄化装置にHCを供給するHC供給装置と、
前記排気浄化装置を再生させる際に内燃機関において液体燃料と圧縮天然ガスとを混合燃焼させているときは、内燃機関において液体燃料のみを燃焼させてその運転状態を同一としているときに比べて、前記HC供給装置から前記排気浄化装置に供給するHC量を減少させるHC供給量制御装置と、
を備える。
[概略構成]
図1は、本実施例に係る内燃機関とその燃料系及び吸排気系の概略構成を示す図である。内燃機関1は、軽油及びCNGを燃料として使用可能な車両駆動用のエンジンである。内燃機関1は圧縮着火式のエンジンである。内燃機関1は、軽油とCNGとを混合燃焼させることで運転することができ、また、軽油のみを燃焼させることによっても運転することができる。
本実施例においては、フィルタ23に堆積したPMを除去して該フィルタ23を再生させるフィルタ再生処理が行なわれる。本実施例に係るフィルタ再生処理は、軽油添加弁24から排気中に軽油を添加することで実現される。
次に、本実施例に係るフィルタ再生処理の実行時における軽油添加弁24からの目標軽油添加量Qaddtの算出方法について説明する。内燃機関1の気筒2内において軽油又はCNGが完全には燃焼せずに燃え残ることでHCが発生する。そのため、内燃機関1から排出される排気にはHCが含まれている。
2・・・気筒
8・・・軽油インジェクタ
9・・・CNGインジェクタ
20・・ECU
21・・排気浄化装置
22・・酸化触媒
23・・パティキュレートフィルタ
24・・軽油添加弁
28・・クランク角センサ
29・・アクセル開度センサ
Claims (2)
- 液体燃料と圧縮天然ガスとを混合燃焼することが可能な内燃機関の排気浄化システムであって、
内燃機関の排気通路に設けられ、酸化機能を有する排気浄化装置と、
前記排気浄化装置を再生させる際に前記排気浄化装置にHCを供給するHC供給装置と、
前記排気浄化装置を再生させる際に内燃機関において液体燃料と圧縮天然ガスとを混合燃焼させているときは、内燃機関において液体燃料のみを燃焼させてその運転状態を同一としているときに比べて、前記HC供給装置から前記排気浄化装置に供給するHC量を減少させるHC供給量制御装置と、
を備えた内燃機関の排気浄化システム。 - 前記HC供給量制御装置が、
内燃機関において液体燃料のみを燃焼させているときに該内燃機関から排出されるHC量である第一HC排出量を算出する第一HC排出量算出部と、
内燃機関において液体燃料と圧縮天然ガスとを混合燃焼させているときに該内燃機関から排出されるHC量である第二HC排出量を算出する第二HC排出量算出部と、を有し、
前記排気浄化装置を再生させる際に内燃機関において液体燃料と圧縮天然ガスとを混合燃焼させているときは、内燃機関において液体燃料のみを燃焼させてその運転状態を同一としているときに比べて、前記HC供給装置から前記排気浄化装置に供給するHC量を、前記第一HC排出量と前記第二HC排出量との差分減少させる請求項1に記載の内燃機関の排気浄化システム。
Priority Applications (5)
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EP10860526.2A EP2650498B1 (en) | 2010-12-07 | 2010-12-07 | Exhaust gas purification system for an internal combustion engine |
PCT/JP2010/071932 WO2012077189A1 (ja) | 2010-12-07 | 2010-12-07 | 内燃機関の排気浄化システム |
CN201080070551.5A CN103261610B (zh) | 2010-12-07 | 2010-12-07 | 内燃机的排气净化系统 |
JP2012547623A JP5626359B2 (ja) | 2010-12-07 | 2010-12-07 | 内燃機関の排気浄化システム |
US13/879,201 US8943810B2 (en) | 2010-12-07 | 2010-12-07 | Exhaust gas purification system for an internal combustion engine |
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PCT/JP2010/071932 WO2012077189A1 (ja) | 2010-12-07 | 2010-12-07 | 内燃機関の排気浄化システム |
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CN111359362A (zh) * | 2020-04-28 | 2020-07-03 | 漯河职业技术学院 | 一种车间粉尘治理装置 |
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EP2708722B1 (en) * | 2011-05-13 | 2018-06-20 | Toyota Jidosha Kabushiki Kaisha | Control apparatus and method for an internal combustion engine |
JP6233492B1 (ja) * | 2016-11-14 | 2017-11-22 | マツダ株式会社 | 排気浄化装置の再生制御装置 |
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JPH08158980A (ja) | 1994-12-06 | 1996-06-18 | Mitsubishi Motors Corp | 補助燃料着火式ガスエンジン及びその稼働方法 |
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US8943810B2 (en) | 2015-02-03 |
CN103261610B (zh) | 2015-08-05 |
CN103261610A (zh) | 2013-08-21 |
US20130247546A1 (en) | 2013-09-26 |
EP2650498A4 (en) | 2017-07-26 |
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