WO2011125257A1 - エンジンの排気浄化装置 - Google Patents
エンジンの排気浄化装置 Download PDFInfo
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- WO2011125257A1 WO2011125257A1 PCT/JP2010/071711 JP2010071711W WO2011125257A1 WO 2011125257 A1 WO2011125257 A1 WO 2011125257A1 JP 2010071711 W JP2010071711 W JP 2010071711W WO 2011125257 A1 WO2011125257 A1 WO 2011125257A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
- B01D53/9477—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on separate bricks, e.g. exhaust systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9495—Controlling the catalytic process
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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
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1459—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being a hydrocarbon content or concentration
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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
- F01N13/02—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 silencers in series
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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
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/04—Filtering activity of 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0418—Methods of control or diagnosing using integration or an accumulated value within an elapsed period
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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
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1404—Exhaust gas temperature
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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
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
- F01N2900/1812—Flow rate
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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
- F01N3/10—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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- 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
- F01N3/2066—Selective catalytic reduction [SCR]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/228—Warning displays
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/0275—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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Definitions
- the present invention relates to an exhaust emission control device for purifying engine exhaust.
- Diesel particulate filter that collects and removes particulate matter (PM), carbon monoxide (CO), hydrocarbon (HC) as an exhaust purification device that purifies engine exhaust
- a three-way catalytic converter that simultaneously purifies NOx and nitrogen oxide (NOx), a selective catalytic reduction (SCR) converter that purifies NOx using a reducing agent, and the like have been put into practical use.
- NOx nitrogen oxide
- SCR selective catalytic reduction
- Patent Document 1 the accumulated amount of the sulfur component accumulated in the exhaust purification element is estimated based on the fuel consumption and the sulfur content of the fuel. However, when this exceeds a predetermined value, a technique for executing a sulfur component forcible separation process has been proposed.
- the present invention pays attention to the characteristic that the fuel component is released according to the exhaust temperature, and the exhaust purification device that improves the estimation accuracy of the accumulated amount of the fuel component accumulated in the exhaust purification element.
- the purpose is to provide.
- an engine exhaust purification device includes an exhaust purification element disposed in an exhaust pipe of the engine, a temperature sensor for detecting the temperature of exhaust flowing into the exhaust purification element, and a control unit incorporating a computer. . Then, the control unit estimates the discharge amount per unit time of the predetermined fuel component contained in the exhaust gas, and per unit time of the fuel component that leaves the exhaust gas purification element based on the temperature of the exhaust gas detected by the temperature sensor. The amount of fuel component accumulated in the exhaust purification element is estimated based on the amount of fuel component discharged per unit time and the amount of separation.
- FIG. 1 shows an example of an exhaust purification device.
- An intake pipe 14 connected to the intake manifold 12 of the diesel engine 10 includes an air cleaner 16 that filters dust in the air along a direction of intake air flow, a compressor 18A of a turbocharger 18 that supercharges intake air, and a turbocharger 18.
- An intercooler 20 that cools the intake air that has passed through and becomes hot is arranged in this order.
- the exhaust pipe 24 connected to the exhaust manifold 22 of the diesel engine 10 is injected with a turbine 18B of the turbocharger 18, a continuously regenerating DPF device 26, and an aqueous urea solution as a reducing agent precursor along the exhaust flow direction.
- a reducing agent injection device 28 having an injection nozzle to supply, an SCR converter 30 that selectively reduces and purifies NOx using ammonia (reducing agent) generated from an aqueous urea solution, and an oxidation catalytic converter 32 that oxidizes ammonia that has passed through the SCR converter 30. are arranged in this order.
- the continuously regenerating DPF device 26 collects and removes PM in a diesel oxidation catalyst (DOC) converter 26A that oxidizes at least nitric oxide (NO) to nitrogen dioxide (NO 2 ) and exhaust gas.
- DOC diesel oxidation catalyst
- DPF 26B CSF (Catalyzed Soot Filter) having a catalyst (active component and additive component) supported on its surface can be used.
- the DOC converter 26A, the DPF 26B, the SCR converter 30 and the oxidation catalyst converter 32 disposed in the exhaust pipe 24 corresponds to an exhaust purification element constituting a part of the exhaust purification device.
- the diesel engine 10 is provided with an exhaust gas recirculation (EGR) device 34 that reduces NOx by lowering the combustion temperature by introducing a part of the exhaust gas into the intake air and recirculating it.
- the EGR device 34 introduces an exhaust gas flowing through the exhaust pipe 24 into the intake pipe 14, an EGR pipe 34 ⁇ / b> A for cooling the exhaust gas flowing through the EGR pipe 34 ⁇ / b> A, and the intake pipe 14.
- an EGR control valve 34C for controlling the EGR rate of the exhaust.
- a temperature sensor 36 for detecting the temperature (exhaust temperature) T 1 of the exhaust gas flowing into the DOC converter 26A is attached upstream of the DOC converter 26A of the continuous regeneration type DPF device 26.
- a temperature sensor 38 for detecting the temperature (exhaust temperature) T 2 of the exhaust gas flowing into the DPF 26B is attached between the DOC converter 26A and the DPF 26B of the continuous regeneration type DPF device 26.
- a temperature sensor 40 for detecting the temperature (exhaust temperature) T 3 of the exhaust gas flowing into the SCR converter 30 and the oxidation catalyst converter 32 is attached between the continuous regeneration type DPF device 26 and the reducing agent injection device 28. Note that a temperature sensor may be further provided between the SCR converter 30 and the oxidation catalyst converter 32 in order to detect the exhaust gas temperature flowing into the oxidation catalyst converter 32.
- Each output signal of the temperature sensors 36, 38 and 40 is input to a control unit 42 having a built-in computer. Further, as an example of the operation state of the diesel engine 10, output signals of a rotation speed sensor 44 that detects the rotation speed Ne and an output signal of the load sensor 46 that detects the load Q are also input to the control unit 42.
- the load Q of the diesel engine 10 for example, a state quantity closely related to the torque, such as an intake air flow rate, an intake pressure, a supercharging pressure, an accelerator opening degree, and a throttle opening degree, can be applied.
- the rotational speed Ne and the load Q of the diesel engine 10 may be read from an engine control unit (not shown) that electronically controls the diesel engine 10 via a CAN (Controller (Area Network) or the like.
- the control unit 42 executes a control program stored in a non-volatile memory such as a ROM (Read Only Memory), so that a fuel component exceeding an allowable value in the exhaust purification element based on signals from various sensors ( Sulfur component, HC component, etc.) are accumulated. Further, when the control unit 42 determines that the fuel component exceeding the allowable value has accumulated in the exhaust purification element, the fuel injection attached to the diesel engine 10 is performed so as to raise the exhaust temperature and forcibly release the fuel component. A fuel increase command is output to the device, and a warning lamp 48 (notification device) attached to the combination meter is turned on.
- a warning lamp 48 notification device
- FIG. 2 shows the contents of a control program that the control unit 42 repeatedly executes every unit time (for example, 1 second) when the diesel engine 10 is started.
- the control unit 42 electronically controls the reducing agent injection device 28 and the EGR control valve 34C according to the engine operating state and the like according to a control program different from the control program shown in FIG.
- step 1 the control unit 42 calculates the fuel supply amount per unit time according to the engine operating state. That is, for example, the control unit 42 reads the load Q from the load sensor 46, refers to a map in which the fuel supply amount corresponding to the load is set, and calculates the fuel supply amount according to the load Q.
- the fuel supply amount may be read from an engine control unit (not shown).
- the control unit 42 estimates the amount of fuel component discharged per unit time, for example, by multiplying the fuel supply amount per unit time by the content of a predetermined fuel component constituting the fuel. To do.
- the content rate of the fuel component may be a fixed value corresponding to the fuel characteristics, for example.
- step 4 the control unit 42 refers to a map in which the fuel component removal amount corresponding to the exhaust temperature is set, and is read from the temperature sensor 36, 38 or 40.
- T i 1 to 3
- “0” is set in which the fuel component cannot be released in the region where the exhaust temperature is equal to or lower than the fuel component release temperature T 0 .
- the amount of separation of the fuel component corresponding to the exhaust temperature may be obtained for each target fuel component through, for example, simulation or experiment.
- step 6 the control unit 42 determines whether or not the accumulated amount of the fuel component accumulated in the exhaust purification element is greater than or equal to a predetermined value.
- the predetermined value is a threshold value for determining whether or not the forced separation process of the fuel component accumulated in the exhaust purification element should be executed. For example, the allowable accumulation of the fuel component allowed in the exhaust purification element It has a value slightly lower than the amount.
- control unit 42 determines that the accumulated amount of the fuel component is greater than or equal to the predetermined value, the control unit 42 proceeds to step 7 (Yes), whereas if it determines that the accumulated amount of the fuel component is less than the predetermined value, the process proceeds. Is terminated (No).
- step 7 the control unit 42 turns on a warning lamp 48 attached to the combination meter so as to notify that the forced separation process of the fuel component accumulated in the exhaust purification element is being executed.
- a buzzer as an example of a notification device may be operated.
- step 8 the control unit 42 raises the exhaust gas temperature above the fuel component release temperature to forcibly release the fuel component accumulated in the exhaust purification element, so that the fuel injection device attached to the diesel engine 10 is used. In response to this, a fuel supply amount increase command is output.
- known forced separation processing such as intake / exhaust shutter opening / closing control, variable turbocharger vane opening control, and post injection control may be executed.
- exhaust gas from the diesel engine 10 is introduced into the DOC converter 26A of the continuous regeneration type DPF device 26 through the exhaust manifold 22 and the turbine 18B of the turbocharger 18.
- Exhaust introduced into the DOC converter 26A flows to being part of the NO is oxidized to NO 2 DPF26B.
- PM in the exhaust gas is collected and removed, and PM is oxidized using NO 2 generated by the DOC converter 26A, so that PM is collected, removed, and regenerated at the same time.
- the urea aqueous solution injected and supplied from the reducing agent injection device 28 according to the engine operating state is hydrolyzed using exhaust heat and water vapor in the exhaust, and converted into ammonia that functions as a reducing agent.
- This ammonia is known to be selectively reduced with NOx in the exhaust gas in the SCR converter 30 and purified to water (H 2 O) and nitrogen gas (N 2 ), which are harmless components.
- the ammonia that has passed through the SCR converter 30 is oxidized by the oxidation catalytic converter 32 disposed downstream of the exhaust gas, so that it is possible to suppress the ammonia from being released into the atmosphere as it is.
- the fuel component discharge amount per unit time estimated from the fuel supply amount is sequentially integrated, and the fuel component removal amount corresponding to the exhaust temperature is sequentially subtracted from this integrated value.
- the accumulated amount of the fuel component accumulated in the exhaust purification element to be monitored is estimated.
- the fuel component accumulated in the exhaust purification element pays attention to the characteristic that the exhaust temperature decreases in the region where the exhaust temperature is higher than the desorption temperature of the fuel component, and by considering not only the emission amount of the fuel component but also its desorption amount.
- the accumulated amount of the fuel component in the exhaust purification element can be estimated with high accuracy.
- the warning lamp 48 attached to the combination meter is turned on, and the fuel component forcible removal process is executed.
- the accumulated amount of the fuel component accumulated in the exhaust purification element may be read from the non-volatile memory when the engine is started while the control unit 42 writes the non-volatile memory when the engine is stopped. In this way, since the accumulated amount of the fuel component is not reset when the engine is stopped, the value calculated so far can be taken over, and the estimation accuracy of the accumulated amount of the fuel component can be suppressed from decreasing.
- a function of forcibly resetting the accumulated amount of the fuel component in response to an instruction from the outside may be provided. Further, the forcible detachment of the fuel component accumulated in the exhaust purification element may be executed in response to an instruction from a driver who notices that the warning lamp 48 is turned on, not automatically.
- the present invention is not limited to the exhaust gas purification device of the diesel engine 10, but can also be applied to a three-way catalytic converter that simultaneously purifies CO, HC and NOx contained in the exhaust gas of the gasoline engine.
- the present invention is not limited to the DOC converter 26A, the DPF 26B, the SCR converter 30, the oxidation catalytic converter 32, and the three-way catalytic converter, but can be applied to various exhaust purification elements disposed in the exhaust pipe. Further, in the present invention, a plurality of exhaust purification elements may be monitored.
- Diesel engine 24 Exhaust pipe 26 Continuous regeneration type DPF device 26A DOC converter 26B DPF 30 SCR converter 32 Oxidation catalytic converter 36 Temperature sensor 38 Temperature sensor 40 Temperature sensor 42 Control unit 48 Warning light
Abstract
Description
図1は、排気浄化装置の一例を示す。
ディーゼルエンジン10の吸気マニフォールド12に接続される吸気管14には、吸気流通方向に沿って、空気中の埃などを濾過するエアクリーナ16,吸気を過給するターボチャージャ18のコンプレッサ18A,ターボチャージャ18を通過して高温となった吸気を冷却するインタークーラ20がこの順番で配設される。
ステップ3では、コントロールユニット42が、例えば、「蓄積量=蓄積量+単位時間当たりの排出量」という式を利用して、監視対象とする排気浄化エレメント、即ち、DOCコンバータ26A,DPF26B,SCRコンバータ30又は酸化触媒コンバータ32に蓄積された燃料成分の蓄積量を推定する。
ステップ6では、コントロールユニット42が、排気浄化エレメントに蓄積された燃料成分の蓄積量が所定値以上であるか否かを判定する。ここで、所定値は、排気浄化エレメントに蓄積された燃料成分の強制離脱処理を実行すべきか否かを判定するための閾値であって、例えば、排気浄化エレメントに許容される燃料成分の許容蓄積量より若干低い値を持つ。そして、コントロールユニット42は、燃料成分の蓄積量が所定値以上であると判定すれば処理をステップ7へと進める一方(Yes)、燃料成分の蓄積量が所定値未満であると判定すれば処理を終了させる(No)。
ステップ8では、コントロールユニット42が、排気温度を燃料成分の離脱温度よりも昇温させることで、排気浄化エレメントに蓄積された燃料成分を強制離脱させるため、ディーゼルエンジン10に取り付けられた燃料噴射装置に対して、燃料供給量の増量指令を出力する。なお、排気温度を昇温させるために、吸気シャッタ又は排気シャッタの開閉制御,可変ターボチャージャのベーン開度制御, ポスト噴射制御など公知の強制離脱処理を実行するようにしてもよい。
24 排気管
26 連続再生式DPF装置
26A DOCコンバータ
26B DPF
30 SCRコンバータ
32 酸化触媒コンバータ
36 温度センサ
38 温度センサ
40 温度センサ
42 コントロールユニット
48 警告灯
Claims (9)
- エンジンの排気管に配設された排気浄化エレメントと、
前記排気浄化エレメントに流入する排気の温度を検出する温度センサと、
コンピュータを内蔵したコントロールユニットと、
を有し、
前記コントロールユニットが、
排気に含まれる所定の燃料成分の単位時間当たりの排出量を推定し、
前記温度センサにより検出された排気の温度に基づいて、前記排気浄化エレメントから離脱する燃料成分の単位時間当たりの離脱量を推定し、
前記燃料成分の単位時間当たりの排出量及び離脱量に基づいて、前記排気浄化エレメントに蓄積されている燃料成分の蓄積量を推定する、
ことを特徴とするエンジンの排気浄化装置。 - 前記コントロールユニットが、更に、前記燃料成分の蓄積量が所定値以上になったときに、前記排気浄化エレメントに蓄積されている燃料成分を強制的に離脱させる時期が到来したと判定することを特徴とする請求項1に記載のエンジンの排気浄化装置。
- 前記コントロールユニットが、更に、前記燃料成分を強制的に離脱させる時期が到来したと判定したときに、報知装置を作動させることを特徴とする請求項2に記載のエンジンの排気浄化装置。
- 前記コントロールユニットが、更に、前記燃料成分を強制的に離脱させる時期が到来したと判定したときに、前記排気浄化エレメントに流入する排気の温度を燃料成分の離脱温度よりも昇温させる強制離脱処理を実行することを特徴とする請求項2に記載のエンジンの排気浄化装置。
- 前記コントロールユニットが、更に、エンジン停止時に、前記燃料成分の蓄積量を不揮発性メモリに書き込む一方、エンジン始動時に、前記不揮発性メモリから燃料成分の蓄積量を読み出すことを特徴とする請求項1に記載のエンジンの排気浄化装置。
- 前記コントロールユニットが、更に、外部からの指示に応答して、前記燃料成分の蓄積量を強制的にリセットすることを特徴とする請求項1に記載のエンジンの排気浄化装置。
- 前記コントロールユニットが、単位時間当たりの燃料供給量、及び、燃料における燃料成分の含有率に基づいて、前記燃料成分の単位時間当たりの排出量を推定することを特徴とする請求項1に記載のエンジンの排気浄化装置。
- 前記コントロールユニットが、排気の温度に対応した燃料成分の離脱量が設定されたマップを参照して、前記温度センサにより検出された排気の温度に応じた燃料成分の離脱量を推定することを特徴とする請求項1に記載のエンジンの排気浄化装置。
- 前記コントロールユニットが、前記燃料成分の単位時間当たりの排出量を順次積算しつつ、この積算値から燃料成分の単位時間当たりの離脱量を順次減算することで、前記燃料成分の蓄積量を推定することを特徴とする請求項1に記載のエンジンの排気浄化装置。
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BR112012025150A BR112012025150A2 (pt) | 2010-04-07 | 2010-12-02 | aparelho para purificação de escapamento para motor |
DE112010005470.3T DE112010005470B4 (de) | 2010-04-07 | 2010-12-03 | Abgasreinigungsvorrichtung für einen Motor |
CN201080065872.6A CN102884290B (zh) | 2010-04-07 | 2010-12-03 | 发动机的排气净化装置 |
US13/646,257 US8850799B2 (en) | 2010-04-07 | 2012-10-05 | Exhaust purification apparatus for engine |
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US20130025262A1 (en) | 2013-01-31 |
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