WO2006081598A2 - Verfahren zur diagnose eines abgasnachbehandlungssystems - Google Patents
Verfahren zur diagnose eines abgasnachbehandlungssystems Download PDFInfo
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- WO2006081598A2 WO2006081598A2 PCT/AT2006/000029 AT2006000029W WO2006081598A2 WO 2006081598 A2 WO2006081598 A2 WO 2006081598A2 AT 2006000029 W AT2006000029 W AT 2006000029W WO 2006081598 A2 WO2006081598 A2 WO 2006081598A2
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- Prior art keywords
- internal combustion
- combustion engine
- exhaust gas
- operating state
- diagnostic
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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
- F01N3/0235—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 exhaust gas throttling means
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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
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9431—Processes characterised by a specific device
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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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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/005—Electrical control of exhaust gas treating apparatus using models instead of sensors to determine operating characteristics of exhaust systems, e.g. calculating catalyst temperature instead of measuring it directly
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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
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B37/22—Control of the pumps by varying cross-section of exhaust passages or air passages, e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits
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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
- F02D41/14—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
- F02D41/146—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 an NOx content or concentration
- F02D41/1463—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 an NOx content or concentration of the exhaust gases downstream of exhaust gas treatment apparatus
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- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
- F01N2260/14—Exhaust treating devices having provisions not otherwise provided for for modifying or adapting flow area or back-pressure
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- F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
- F01N2430/06—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by varying fuel-air ratio, e.g. by enriching fuel-air mixture
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- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
- F01N2430/08—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by modifying ignition or injection timing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/02—Catalytic activity of catalytic converters
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- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
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- 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
- F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
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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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
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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
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
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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
- F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
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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
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0406—Layout of the intake air cooling or coolant circuit
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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
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
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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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
- F02D41/0055—Special engine operating conditions, e.g. for regeneration of exhaust gas treatment apparatus
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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
- F02D41/146—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 an NOx content or concentration
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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
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/23—Layout, e.g. schematics
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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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
- Y02T10/40—Engine management systems
Definitions
- the invention relates to a method for the diagnosis of an exhaust aftertreatment system for the reduction of nitrogen oxides in the exhaust line of an internal combustion engine by means of selective catalytic reduction, wherein a reducing agent is introduced via a metering device in the exhaust gas, with at least one downstream of an exhaust aftertreatment device arranged NO x -sensitive sensor , And a device for carrying out the method.
- the invention relates to an internal combustion engine, in particular diesel internal combustion engine, with an exhaust system, in which at least one exhaust gas aftertreatment device preferably formed by a particulate filter is arranged, wherein a regeneration of the exhaust gas aftertreatment device can be initiated by increasing the temperature of the exhaust gas.
- the invention relates to a method for operating an internal combustion engine.
- SCR systems consist of an arranged in the exhaust system of an internal combustion engine SCR catalyst which catalyzes at sufficiently high temperatures, the reaction of nitrogen oxides (NOx) with a reducing agent to harmless end products such as water and nitrogen.
- a reductant tank consists of a reductant tank, a reductant dosing unit and a reductant injector which introduces reductant into the exhaust gas upstream of the SCR catalyst.
- the reducing agent used is usually an aqueous urea solution which liberates ammonia (NH 3) as the actual active substance at high temperatures in the SCR catalyst.
- the SCR system is controlled by an electronic control unit, the ECU, which is either equal to the control unit of the internal combustion engine or a separate control unit, which is in data communication with the control unit of the internal combustion engine.
- the control unit controls the reducing agent metering unit in such a way that the amount of reducing agent which is required to reduce the nitrogen oxides generated in the current engine operating point is supplied to the exhaust gas.
- a temperature sensor is also provided in the exhaust system to ensure that the reducing agent is supplied only at a sufficiently high temperature of the SCR catalyst.
- the task of diagnosing an SCR system would be very easily solved by a NOx sensor with sufficient sensitivity, which is installed in the exhaust line downstream of the SCR catalyst and sends information about the NOx concentration behind the SCR catalyst to the control unit ECU.
- a NOx sensor with sufficient sensitivity which is installed in the exhaust line downstream of the SCR catalyst and sends information about the NOx concentration behind the SCR catalyst to the control unit ECU.
- Such an arrangement is known for example from US 6,363,771 Bl.
- the sensitivity of commercial NO x sensors is at least not sufficient in all required engine operating points for the diagnostic task.
- it is possible with the use of conventional NO x sensors that despite a malfunction of the SCR system, which leads to increased NCy concentrations in the exhaust gas after the SCR catalyst, this increased concentration for the sensor is still too low, and so Malfunction can not be diagnosed.
- a method for operating an internal combustion engine with a particle filter wherein a arranged in the exhaust system of the internal combustion engine particulate filter is regenerated as needed.
- a ⁇ value of an air-fuel ratio between a value ⁇ 1 and a value> 1 periodically switched back and forth that a temperature of the particulate filter is increased by means of a Abgaserhitzung to a value , in which a regeneration of the particulate filter takes place.
- JP 2003-161145 A discloses an exhaust aftertreatment device with a NO x catalyst in the exhaust line and a throttle valve arranged downstream thereof.
- the object of the invention is to describe a method which can still diagnose a fault condition of the exhaust aftertreatment device when using NO x -sensitive sensors with low sensitivity.
- Another object of the invention is a device and a method to propose for the regeneration of a post-treatment device with a short regeneration period.
- Terminating the sensor diagnostic mode preferably switching to the normal mode.
- the emission of NO x emissions is thus briefly increased by a factor of the order of 2 to 10 compared to the normal operation during the diagnosis or sensor diagnostic operating state, so that even with less sensitive NO x -sensitive sensors a lack of reduction of the nitrogen oxides can be easily determined can.
- the increase in NO x emissions can be achieved by reducing the exhaust gas mass flow of the recirculated exhaust gas, by reducing or at least partially bypassing the cooling by means of an exhaust gas recirculation cooled exhaust gas mass flow, by increasing the boost pressure or by changing the injection timing and / or the injection pressure.
- the NO x concentration upstream of the exhaust gas aftertreatment device is at least during the diagnostic operating state or mode.
- sordiagnose sessiles measured and the amount of reducing agent to be introduced into the exhaust gas using the measurement of IMO X concentration upstream of the exhaust aftertreatment device is determined. Additionally or alternatively, it can also be provided that the amount of reducing agent to be introduced into the exhaust gas is determined at least during the diagnostic operating state or sensor diagnostic operating state using a characteristic map and / or a model for determining the NO x emission of the internal combustion engine.
- the diagnosis can be made during normal operation of the internal combustion engine.
- the torque of the internal combustion engine is preferably adjusted by increasing the injected fuel quantity to the torque in the normal operating state.
- NO x sensors in addition to the desired NO x sensitivity, can have a not inconsiderable cross-sensitivity to ammonia and / or other chemical substances.
- basically all sensors which are sufficiently sensitive to NO 2 can be used, regardless of their cross-sensitivity. These sensors are therefore referred to in the context of the application as NO x -sensitive sensors.
- an internal combustion engine with an exhaust aftertreatment device with selective catalytic reduction in the exhaust line, with a metering device for reducing agent upstream of the exhaust aftertreatment device and at least one sensor for measuring the NO x concentration downstream of the exhaust aftertreatment device.
- a temperature sensor is arranged downstream of the exhaust gas aftertreatment device.
- a sensor for measuring the NO x concentration is arranged upstream of the exhaust gas aftertreatment device. It is provided that the metering device is connected to a control unit which controls the Reduktionsffenzu limp depending on the current NO x emissions of the internal combustion engine.
- the internal combustion engine has at least one actuatable by the control unit actuating means for switching the internal combustion engine from a normal operating state in a Diagnosebe- operating state or in a sensor diagnostic operating state.
- variable throttle device is arranged in the exhaust gas system.
- the variable throttle device is advantageously designed as a flap.
- variable throttle device is arranged upstream of the exhaust gas aftertreatment device.
- the throttle device can be arranged downstream of the turbine of an exhaust gas turbocharger.
- the internal combustion engine switches to regeneration operation.
- the temperature after the exhaust gas turbine must be increased, for example to about 62O 0 C, with a certain oxygen content in the exhaust gas, for example, 6%, should not fall below.
- the throttle device in the outlet of the exhaust gas back pressure is increased. This leads to an increase in the charge exchange work, with only a small change in the air mass flow.
- the injected fuel quantity is increased, which leads to a reduction in the ratio of air to fuel and thus to a further increase in temperature.
- the regeneration period of the exhaust gas aftertreatment device can be substantially shortened.
- the influence on the pressure curve in the cylinder is lower than with a throttle valve in the intake system, which results in a lower noise change when switching.
- the throttle device arranged downstream of the turbine also has the advantage that the response of the internal combustion engine in the transit sient réelle is improved. For an acceleration process while the throttle device is opened, which increases the pressure ratio directly to the turbine and thus the transmitted power from the turbine to the compressor.
- variable throttle device is arranged downstream of a branch of an exhaust gas recirculation line from the exhaust system.
- the exhaust gas recirculation rate can also be controlled and even more increased during normal operation by the throttle device than with a throttle device in the intake system.
- the throttle in the intake system can be completely replaced by a throttle in the exhaust system.
- FIGS. show schematically:
- Fig. 1 shows a first embodiment of the invention
- Fig. 2 shows a second embodiment of the invention
- Fig. 4 shows an internal combustion engine according to the invention in a schematic representation.
- the internal combustion engine 1 is equipped with an exhaust aftertreatment device 2, consisting of an SCR catalyst 3, a reducing agent tank 4, a reducing agent metering unit 5 and a reducing agent injection nozzle 6.
- the reducing agent metering unit 5 is controlled by an electronic control unit ECU, the The same control unit as the control unit of the internal combustion engine 1 may be or else another control unit which is in data communication with the control unit of the internal combustion engine 1.
- at least one temperature sensor 7 is arranged in front of or behind the SCR catalytic converter 3 in the exhaust gas line, by means of which the temperature of the SCR catalytic converter 3 can be determined in the control unit ECU.
- a sensor 9 for measuring the concentration of nitrogen oxides (NO x ) arranged and connected to the control unit ECU.
- control unit ECU can actuators on the internal combustion engine 1, by which the internal combustion engine 1 can be brought into an operating state with increased NO x emission.
- FIG. 1 and FIG. 2 show an exhaust gas recirculation valve 10 (EGR valve) for controlling the recirculated exhaust gas mass flow. By reducing the exhaust gas mass flow compared to a normal engine operating state, the nitrogen oxide emission of the internal combustion engine 1 is increased.
- EGR valve exhaust gas recirculation valve
- the recirculated exhaust gas mass flow is cooled via an EGR cooler to further reduce the formation of nitrogen oxides. If it is now possible to reduce or partially bypass the cooling of the recirculated exhaust gas mass flow via the control unit ECU, an operating state with increased NO x emissions can also be produced in this way.
- the NO x emissions of the internal combustion engine 1 can be increased by a factor of the order of 5 to 10 compared to the normal operating state.
- the control unit ECU While the internal combustion engine 1 is in a diagnostic mode with increased NO x emission, the control unit ECU simultaneously controls the reducing agent metering unit 5 so that the amount of reducing agent that is required to the increased NO x emission is supplied to the exhaust gas in the SCR catalyst 3 completely reduce. For this purpose, first the amount or the concentration of NO x in the exhaust gas is determined in this diagnostic operating state and determines therefrom the required amount of reducing agent. For this purpose, a formula, table or characteristic curve is advantageously stored in the control unit ECU, which assigns a corresponding amount of reducing agent to a NO x emission of the internal combustion engine 1.
- a map or model is stored, which based on the operating parameters (engine speed, torque, EGR rate, EGR cooling, boost pressure, injection timing and / or injection pressure ) determines the NO x emission.
- this sensor 13 instead of this, another NO x -sensitive sensor 13, this time upstream of the SCR catalytic converter 3, used to measure the NO x emissions. Because of the increased NO x emissions, this sensor 13 need only have low sensitivity to measure the NO x concentration with sufficient accuracy.
- the addition of the amount of reducing agent in the exhaust gas corresponding to the determined NO x emissions to the SCR catalytic converter 3 only results in a very low NO x concentration, which in many cases is below the sensitivity limit of NO x sensitive sensor 9 is located.
- the NO x concentration so high, that it can also be measured by an NC-sensitive sensor 9 with only low sensitivity.
- the method according to the invention diagnoses a fault condition that can be further processed by other components of a diagnostic system that are not the subject of this invention.
- the diagnostic operating state is set with increased NCy emissions only in the presence of certain prerequisites.
- these conditions include that the temperature of the SCR Catalyst 3 is sufficiently high for the catalytic reaction.
- diagnostic operating states with increased NO x emission for the purpose of diagnosis only if the NO x emissions in the normal operating state are so low that they are not safe given the sensitivity of the NO x -sensitive sensor 9 can be measured.
- Such engine operating states with low NO x emissions are usually characterized by a low engine speed and / or a low torque output by the engine 1.
- Fig. 3 shows in simplified form a flow chart of the method according to the invention.
- the diagnostic conditions for changing to a diagnostic operating state DBZ with increased NO x emissions are fulfilled.
- the temperature of the SCR catalytic converter 3 and the speed and / or the torque of the internal combustion engine can be taken into account.
- a diagnostic operating state DBZ is set with increased NO x emissions.
- the EGR rate and / or the EGR cooling and / or the boost pressure and / or the injection timing and / or the injection pressure can be modified.
- it is advantageous to modify the amount of injected fuel such that the torque output by the internal combustion engine 1 does not change as a result of this switching.
- a subsequent step 30 it is checked whether the concentration of nitrogen oxides in the exhaust gas downstream of the SCR catalytic converter 3 measured by the NO x -sensitive sensor 9 exceeds a certain threshold value.
- This threshold value may be constant or depend on operating variables such as rotational speed and / or torque of the internal combustion engine 1 and / or the measured and / or estimated concentration of NO x upstream of the SCR catalytic converter 3. If the NO x concentration measured by the NO x -sensitive sensor 9 is less than or equal to this threshold value, a "non-fault state” NER is reported to further components of a diagnostic system and returned to the normal operating state NBZ of the internal combustion engine 1. If the measured NO x concentration is greater than this threshold value, then an "error state” ER is sent to further components of an Reported diagnostic system and also returned to the normal operating state NBZ the internal combustion engine 1.
- the method according to the invention is also suitable, with a slight modification, to check that an NO x -sensitive sensor downstream of the exhaust aftertreatment system, in particular the NO x -sensitive sensor 9 used for the diagnosis of the exhaust aftertreatment system, is functional.
- an NO x -sensitive sensor downstream of the exhaust aftertreatment system in particular the NO x -sensitive sensor 9 used for the diagnosis of the exhaust aftertreatment system, is functional.
- the amount of reductant supplied is not increased as much as would be necessary to completely reduce the increased NO x emissions, but only partially, or not at all, or even decreased, thereby increasing the NO x level after the SCR catalyst 3 is significantly increased and is above the sensitivity threshold of the NO x -sensitive sensor 9.
- an intact NO x -sensitive sensor must indicate the increased NO x concentration. If the increased NO x concentration is not displayed, then an error state of the NO x -sensitive sensor 9 can be concluded.
- the results of the diagnosis of the exhaust aftertreatment system and / or the diagnosis of the NO x -sensitive sensor can be stored for example in a fault memory. Furthermore, it is possible to control an error-function lamp in case of malfunction.
- the inventive method is suitable for both diesel and gasoline engines.
- FIG. 4 shows an internal combustion engine 101 with a plurality of cylinders 102, 103, 104, with an inlet branch 105 and an outlet branch 106.
- a charge air filter 107 and a charge air cooler 108 are arranged in the inlet branch.
- Exhaust system 106 and intake system 105 are interconnected via an exhaust gas recirculation line 109, which branches off upstream of the turbine 110 of an exhaust gas turbocharger 111 from the exhaust line 106.
- the compressor of the exhaust gas turbocharger 111 is designated.
- an exhaust gas aftertreatment device 113 Downstream of the turbine 110, an exhaust gas aftertreatment device 113, for example a particle filter, is arranged downstream of the turbine 110. Between the turbine 110 and the exhaust aftertreatment device 113, a throttle device 114 formed by a flap is provided in the exhaust line 106. To perform the regeneration of the exhaust aftertreatment device 113, the internal combustion engine 101 is switched to regeneration mode. For this purpose, the temperature after the turbine 110, for example, must be increased to 62O 0 C, wherein a certain oxygen content in the exhaust gas of about 6% must not be exceeded and where further the engine torque should remain unchanged. To achieve this chen, the throttle device 114 is at least partially closed in the exhaust line 106. This causes the exhaust back pressure to increase, and thus the charge cycle work of the engine 101 is increased.
- Another advantageous effect relates to the transient behavior of the internal combustion engine 101.
- the throttle device 114 is opened, which increases the pressure ratio directly at the turbine 110 and thus the power transmitted from the turbine 110 to the compressor 112.
- the throttle device 114 in the exhaust system 106 and the exhaust gas recirculation rate in normal operation - compared with a throttle device 115 in the intake system 105 - can be increased.
Abstract
Description
Claims
Priority Applications (2)
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DE112006000054T DE112006000054A5 (de) | 2005-02-03 | 2006-01-19 | Verfahren zur Diagnose eines Abgasnachbehandlungssystems |
US11/792,398 US8286417B2 (en) | 2005-02-03 | 2006-01-19 | Diagnosis method for an exhaust gas post-treatment system |
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AT1772005A AT501336B1 (de) | 2005-02-03 | 2005-02-03 | Brennkraftmaschine |
ATA177/2005 | 2005-02-03 | ||
AT0036205A AT501503B1 (de) | 2005-03-03 | 2005-03-03 | Verfahren zur diagnose eines abgasnachbehandlungssystems |
ATA362/2005 | 2005-03-03 |
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WO2006081598A2 true WO2006081598A2 (de) | 2006-08-10 |
WO2006081598A3 WO2006081598A3 (de) | 2006-11-30 |
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PCT/AT2006/000029 WO2006081598A2 (de) | 2005-02-03 | 2006-01-19 | Verfahren zur diagnose eines abgasnachbehandlungssystems |
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US (1) | US8286417B2 (de) |
DE (1) | DE112006000054A5 (de) |
WO (1) | WO2006081598A2 (de) |
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Also Published As
Publication number | Publication date |
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US20080103684A1 (en) | 2008-05-01 |
DE112006000054A5 (de) | 2008-02-28 |
WO2006081598A3 (de) | 2006-11-30 |
US8286417B2 (en) | 2012-10-16 |
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