EP4314519A1 - Method for adjusting an oxygen flushing mass of a catalytic converter and for controlling an air-fuel ratio of an internal combustion engine taking into account the detected oxygen flushing mass - Google Patents
Method for adjusting an oxygen flushing mass of a catalytic converter and for controlling an air-fuel ratio of an internal combustion engine taking into account the detected oxygen flushing massInfo
- Publication number
- EP4314519A1 EP4314519A1 EP22708416.7A EP22708416A EP4314519A1 EP 4314519 A1 EP4314519 A1 EP 4314519A1 EP 22708416 A EP22708416 A EP 22708416A EP 4314519 A1 EP4314519 A1 EP 4314519A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oxygen
- air
- catalytic converter
- internal combustion
- combustion engine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000001301 oxygen Substances 0.000 title claims abstract description 93
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 93
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000000446 fuel Substances 0.000 title claims abstract description 46
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 36
- 238000011010 flushing procedure Methods 0.000 title claims abstract description 17
- 230000002000 scavenging effect Effects 0.000 claims description 19
- 239000000523 sample Substances 0.000 claims description 18
- 239000003054 catalyst Substances 0.000 claims description 14
- 238000004590 computer program Methods 0.000 claims description 13
- 108010076504 Protein Sorting Signals Proteins 0.000 claims description 6
- 230000000717 retained effect Effects 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000010926 purge Methods 0.000 description 16
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 229930195733 hydrocarbon Natural products 0.000 description 5
- 150000002430 hydrocarbons Chemical class 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910001868 water Inorganic materials 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- 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
- F02D41/0295—Control according to the amount of oxygen that is stored on the exhaust gas treating apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
- F01N3/101—Three-way catalysts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
-
- 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
- F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
- F02D41/1441—Plural sensors
-
- 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
- F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
- F02D41/1475—Regulating the air fuel ratio at a value other than stoichiometry
-
- 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
- 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
-
- 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
- F01N2550/02—Catalytic activity of catalytic converters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
-
- 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
- F01N2900/1402—Exhaust gas composition
-
- 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
- F01N2900/1624—Catalyst oxygen storage capacity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0814—Oxygen storage amount
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0816—Oxygen storage capacity
-
- 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
- F02D41/1454—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 oxygen content or concentration or the air-fuel ratio
- F02D41/1456—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 oxygen content or concentration or the air-fuel ratio with sensor output signal being linear or quasi-linear with the concentration of oxygen
Definitions
- DE102016219936A1 discloses a three-way catalyst control method for reducing fuel consumption.
- the method includes determining whether an oxygen storage capacity of the three-way catalyst is in a state of increasing oxygen when a state of performing the O 2 purge air control for the three-way catalyst.
- the method further includes performing an O 2 purge control by applying a predetermined O 2 purge time according to which an adjusted initial value of the oxygen of the OSC is applied when the OSC is not in the oxygen increasing state.
- the 02 purge air control is performed by applying the 02 purge air time period for a deteriorated product based on an oxygen sensor or an 02 purge air time period for on-board diagnosis when an increase amount of the calculated 02 purge air time period is equal to or greater than the 02 purge air time period for is the degraded product during the 02 purge air control.
- a method for adjusting an oxygen scavenging mass of a catalytic converter and for controlling an air-fuel ratio of an internal combustion engine comprising the steps: i. Calculation of an oxygen scavenging mass from an amount of air flowing into the engine and an amount of fuel flowing into the engine, and by taking an integral of an increase in an amount of oxygen stored in the catalyst from a point in time when an air-fuel ratio starts to become lean to a point in time at which an oxygen content measured by a lambda sensor arranged downstream of the catalytic converter exceeds a limit value, ii. Carry out a catalytic converter flushing process by enriching the air-fuel ratio, taking into account the calculated oxygen flushing mass.
- the oxygen purge mass is an amount of oxygen that the catalyst can currently absorb. An oxygen storage capacity per se is difficult to determine directly, which is why the oxygen scavenging mass is determined.
- the oxygen scavenging mass is at most as high as the oxygen storage capacity. After the method has been carried out, it is clear how large the oxygen storage capacity of the catalytic converter is at the moment (namely as large as the detected oxygen scavenging mass).
- the oxygen scavenging mass is calculated until the oxygen content measured by the lambda probe downstream of the catalytic converter falls below an upper limit value. With this oxygen content, the voltage of a conventional lambda probe drops to 0.1 V to 0.35 V, for example.
- the catalytic converter no longer absorbs any oxygen and a corresponding amount of oxygen arrives at the lambda probe.
- a transition from a high voltage of approx. 1 V to the voltage proportional to the limit value occurs abruptly in a few milliseconds.
- the catalytic converter still absorbs oxygen.
- the stored oxygen scavenging mass of the catalytic converter can be calculated.
- the mass of oxygen can be determined from a mass of air flowing into the internal combustion engine and a proportion of injected fuel.
- the method according to claim 1 can be started when the internal combustion engine is running lean, for example in overrun mode.
- the method can preferably be started during normal operation in order to measure the current oxygen storage capacity. Normal operation is when the internal combustion engine is at stoichiometric Combustion ratio is operated.
- the method can be carried out after a catalytic converter scavenging process in order to obtain information about the oxygen scavenging mass on the one hand and to set the predefined proportion of the oxygen storage capacity on the other.
- the catalyst flushing is carried out only until a certain remaining oxygen concentration is reached.
- the catalyst scavenging process is carried out up to a point in time at which a predefined proportion of the oxygen scavenging mass is retained.
- the predefined proportion enables an optimal catalytic conversion of nitrogen oxides and hydrocarbons into water, carbon dioxide and nitrogen.
- An excess of unburned hydrocarbons, which is caused by a brief enrichment of the air/fuel ratio, can thus be absorbed within the scope of the remaining oxygen storage capacity.
- the excess fuel is accurately known from the previously determined total oxygen storage capacity and the remaining oxygen storage capacity adjustment.
- the internal combustion engine As a rule, that is to say at normal operating points of the internal combustion engine, provision is made for the internal combustion engine to be operated at a stoichiometric air-fuel ratio after the method has been carried out.
- the oxygen content is detected by measuring a voltage at the second lambda probe arranged downstream of the catalytic converter, and the limit value of the oxygen content is reached when the measured voltage falls below a limit value.
- a control unit can be provided which can control an internal combustion engine or at least its air/fuel ratio.
- One embodiment relates to a computer program product with program code means that are stored on a computer-readable data carrier in order to carry out the method described above when the computer program product is executed on a computer, in particular in control electronics of a control unit.
- the control unit can be designed and developed as described above.
- One embodiment relates to a computer program with encoded instructions for carrying out the method described above when the computer program is executed on a computer, in particular on control electronics of a control unit.
- the control unit can be designed and developed as described above.
- the computer program can be stored in particular on the computer program product described above, for example a floppy disk, CD-ROM, DVD, memory, a processor unit connected to the Internet.
- the computer program can in particular be in the form of a compiled or not yet compiled data sequence, which is preferably based on a higher, in particular object-based, computer language.
- One embodiment relates to a signal sequence with computer-readable instructions for carrying out the method described above when the signal sequence is processed by a computer, in particular an electronic control unit of a control unit.
- the control unit can be designed and developed as described above.
- the signal sequence can be generated in particular with the aid of the computer program described above and/or with the aid of the computer program product described above.
- the signal sequence can be provided wirelessly or wired as electrical pulses and/or electromagnetic waves and/or optical pulses.
- a means for implementing the method steps within the meaning of the present disclosure can be designed in terms of hardware and/or software, in particular a processing unit, in particular a digital processing unit, in particular a control unit with microprocessors, preferably connected to a memory and/or bus system for data or signals ( CPU) and/or one or more programs or program modules.
- the CPU can be designed to process commands that are implemented as a program, to detect input signals from a data bus and/or to emit output signals to a data bus.
- the program can be stored on a storage system.
- the storage system can have one or more, in particular different, storage media, in particular optical, magnetic, solid and/or other non-volatile media.
- the program may be arranged to embody or be capable of performing the methods described herein such that the CPU can perform the steps of such methods.
- one or more, in particular all, steps of the method can be carried out completely or partially in an automated manner.
- FIG. 1 shows a schematic of an internal combustion engine with an exhaust system and a catalytic converter
- Fig. 2 a time profile of an air-fuel ratio (upper graph), parallel to this a time profile of a voltage U at a lambda probe 13 arranged downstream of the catalytic converter (middle graph) and parallel to the two upper graphs a time profile of an oxygen storage capacity OSC (lower graph); and
- Fig. 3 three method steps of a method that can be implemented in a control unit to control the air-fuel ratio.
- FIG. 1 schematically shows an internal combustion engine 10 with an exhaust tract 15 and a catalytic converter 11 .
- Internal combustion engine 10 can be regulated via a control unit 14 .
- At least one air-fuel ratio can be adjusted by the control unit 14 by injecting more or less fuel.
- the control unit 14 is connected in a manner that is not shown to transmit signals to injection nozzles 17 or to a further control unit for injection nozzles 17 that is not shown, in order to control them.
- a throttle valve 19 is also provided, as is an air flow meter 18.
- a charging device (turbocharger or compressor), not shown, can also be provided.
- a quantity of air which enters the internal combustion engine 10 can be influenced via the throttle flap 19 .
- the amount of air flowing into internal combustion engine 10 is measured at air flow meter 18 .
- An amount of fuel injected at the injectors 17 is based on the inflowing air amount.
- the internal combustion engine 10 operates at an air-fuel ratio of 1, the stoichiometric air fuel ratio.
- the air-fuel ratio can now be increased (lean) or reduced (enriched) via the air quantity or the quantity of fuel injected at the injection nozzles 17 .
- the upper graph of FIG. 2 shows an air-fuel ratio AFR that changes over time.
- the air/fuel ratio AFR is in the lean range between a point in time t1 and a point in time t2; the air/fuel ratio AFR is 1.2.
- the catalytic converter 11 absorbs the oxygen within the scope of its current oxygen storage capacity.
- the oxygen storage capacity of the catalyst 11 changes constantly because it depends on the temperature.
- the control unit 14 is also connected in a signal-transmitting manner to a lambda probe 12 arranged upstream of the catalytic converter 11 and to a lambda probe 13 arranged downstream of the catalytic converter 11 .
- Lambda sensors 12 and 13 are designed to detect oxygen in the exhaust gas, usually by means of an electrical voltage that is proportional to the oxygen content.
- FIG. 2 shows three parallel progressions of parameters.
- the parameters can occur on the internal combustion engine 10 or the catalytic converter 11 and the lambda probe 13 in accordance with FIG.
- the electrical voltage U at the lambda probes 12 and 13 is lower, the higher the oxygen content in the exhaust gas.
- the air-fuel ratio AFR is also enriched; this may take place after a previously performed process, not shown, in which the internal combustion engine was run with excess air. In the process, oxygen accumulates in the catalytic converter 11 .
- the air-fuel ratio AFR becomes leaner. This is reflected at the same time in the course of a voltage U, which is measured at the lambda probe 13 arranged downstream of the catalytic converter 11 .
- the oxygen storage capacity OSC shown in the graph below cannot be measured directly. However, the oxygen storage capacity OSC can be determined indirectly. This is because a maximum oxygen storage capacity OSC of the catalytic converter 11 is reached after a certain time. At this point in time, the catalytic converter 11 no longer extracts oxygen from the exhaust gas. This suddenly becomes clear at the lambda probe 13 at the point in time t2, because the voltage U suddenly drops.
- a corresponding marker can be set to corresponds to a state in which the catalyst 11 is loaded with oxygen and can no longer absorb oxygen.
- the control unit 14 calculates the current maximum oxygen storage capacity OSC of the catalytic converter 11 from an integral of an oxygen scavenging mass 05 over the time between the time tO and the time t1.
- the regular stoichiometric operation of the internal combustion engine 10 is not yet initiated, since when the oxygen storage capacity OSC Nitrogen NOX can no longer be reduced.
- the control unit 14 therefore initiates an enrichment of the air-fuel ratio AFR (see upper graph in FIG. 2) until a remaining portion 16 of the oxygen scavenging mass 06 is still stored in the catalytic converter 11.
- the catalytic converter 11 can convert carbon monoxide, hydrocarbons and nitrogen oxides into carbon dioxide, water and neutral nitrogen as intended.
- the internal combustion engine 10 can be operated briefly enriched and sufficient oxygen then remains in the catalytic converter 11 to reduce unburned fuel.
- the control unit 14 is thus able to always precisely control the amount of fuel that can just be reduced at the catalytic converter 11 . Accordingly, a state can no longer occur in which the catalytic converter 11 cannot convert the nitrogen oxides, hydrocarbons and carbon monoxide introduced into it into water, carbon dioxide and oxygen.
- the oxygen storage capacity is advantageous, but not essential, for the oxygen storage capacity to be calculated immediately before a catalytic converter flushing process.
- the oxygen storage capacity OSC can always be measured by the method in the operation of the engine 11 . After the internal combustion engine 10 has been operated with an excess of oxygen, the catalytic converter 11 can always be flushed until the proportion 16 of the oxygen flushing mass is still stored in the catalytic converter 11 .
- FIG. 3 shows three steps of a method that can be run through in the control unit 14 according to FIG. 1 in order to determine the oxygen storage capacity OSC.
- an oxygen scavenging mass is calculated from a quantity of air flowing into the internal combustion engine and a quantity of fuel flowing into the internal combustion engine 10 and by forming an integral from an increase in a quantity of oxygen stored in the catalytic converter 11 from a point in time t1 at which leaning of an air -Fuel ratio begins until a point in time t2, at which an oxygen content measured by a lambda probe 13, which is arranged downstream of the catalytic converter 11, exceeds a limit value.
- the limit value is present when the voltage U at the lambda probe is low.
- the limit value corresponds to the voltage UG at the lambda probe 13. This can be in the range between 0.01 and 0.2 V, in particular between 0.2 and 0.1 V.
- a catalytic converter flushing process is carried out by enriching the air/fuel ratio up to a point in time t3, at which a predefined proportion 16 of the oxygen flushing mass 05 is retained.
- the predefined proportion 16 enables an optimal catalytic conversion of nitrogen oxides and hydrocarbons into water and nitrogen.
- step 303 the enrichment of the air-fuel ratio AFR is ended from time t3, at which a predefined proportion 16 of the oxygen scavenging mass 05 is retained, and internal combustion engine 10 is also operated at a stoichiometric air-fuel ratio.
- the catalytic converter 11 works in the regular operation of the internal combustion engine 10.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention relates to a method for adjusting an oxygen flushing mass of a catalytic converter (11) and for controlling an air-fuel ratio AFR of an internal combustion engine (10), comprising the steps: i. calculating an oxygen flushing mass O5 from a quantity of air flowing into the internal combustion engine (10) and a quantity of fuel flowing into the internal combustion engine (10) and by forming an integral from an increase in a quantity of oxygen stored in the catalytic converter (11) from a point in time t1 at which an air-fuel ratio AFR begins to lean until a point in time t2 at which an oxygen content measured by a lambda sensor (13) arranged downstream of the catalytic converter (11) exceeds a limit value, and ii. performing a catalytic converter flushing process by enriching the air-fuel ratio AFR, taking into account the calculated oxygen flushing mass O5.
Description
VERFAHREN ZUM EINSTELLEN EINER SAUERSTOFFSPÜLMASSE EINES KATALYSATORS UND ZUR STEUERUNG EINES LUFT-KRAFTSTOFFVERHÄLTNISSES EINES VERBRENNUNGSMOTORS UNTER BERÜCKSICHTIGUNG DER ERFASSTEN METHOD OF ADJUSTING AN OXYGEN PURGE MASS OF A CATALYTIC CONVERTER AND CONTROLLING AN AIR-FUEL RATIO OF AN INTERNAL COMBUSTION ENGINE IN CONSIDERATION OF THE DETECTED
SAUERSTOFFSPÜLMASSE OXYGEN FLUSHING MASS
Technisches Gebiet technical field
DE102016219936A1 offenbart ein Dreiwegekatalysatorsteuerverfahren zum Reduzieren eines Kraftstoffverbrauchs. Das Verfahren umfasst das Ermitteln, ob eine Sauerstoffspeicherkapazität des Dreiwegekatalysators sich in einem Zustand des Erhöhens des Sauerstoffs befindet, wenn ein Zustand des Durchführens der 02-Spülluftsteuerung für den Dreiwegekatalysator erfolgt. Ferner umfasst das Verfahren das Durchführen einer 02-Spülluftsteuerung durch Anwenden einer vorgegebenen 02-Spülluftzeitdauer, gemäß der ein eingestellter, anfänglicher Wert des Sauerstoffs des OSC angewendet wird, wenn sich das OSC nicht in dem Zustand des Erhöhens des Sauerstoffs befindet. Die 02-Spülluftsteuerung wird durch Anwenden der 02- Spülluftzeitdauer für ein verschlechtertes Produkt basierend auf einem Sauerstoffsensor oder einer 02-Spülluftzeitdauer für eine On-Board-Diagnose durchgeführt, wenn ein Anstiegsbetrag der berechneten 02-Spülluftzeitdauer gleich oder größer als die 02-Spülluftzeitdauer für das verschlechterte Produkt während der 02-Spülluftsteuerung ist. DE102016219936A1 discloses a three-way catalyst control method for reducing fuel consumption. The method includes determining whether an oxygen storage capacity of the three-way catalyst is in a state of increasing oxygen when a state of performing the O 2 purge air control for the three-way catalyst. The method further includes performing an O 2 purge control by applying a predetermined O 2 purge time according to which an adjusted initial value of the oxygen of the OSC is applied when the OSC is not in the oxygen increasing state. The 02 purge air control is performed by applying the 02 purge air time period for a deteriorated product based on an oxygen sensor or an 02 purge air time period for on-board diagnosis when an increase amount of the calculated 02 purge air time period is equal to or greater than the 02 purge air time period for is the degraded product during the 02 purge air control.
Beschreibung description
Gemäß einer Aufgabe der vorliegenden Offenbarung sollen Katalysatorspülvorgänge zur Aufrechterhaltung einer vordefinierten Sauerstoffkonzentrationen nach spezifischen Verbrennungsereignissen, welche diese Konzentration beeinflussen, so gesteuert werden, dass nach dem Katalysatorspülvorgang eine Kenntnis einer Sauerstoffspülmasse vorhanden ist.It is an object of the present disclosure to control catalyst purge operations to maintain a predefined oxygen concentration after specific combustion events that affect that concentration such that there is a knowledge of an oxygen purge mass after the catalyst purge operation.
Diese Aufgabe wird mit den Merkmalen des Anspruchs 1 gelöst. Die Unteransprüche zeigen Weiterbildungen der Offenbarung aus. Die Unteransprüche können in beliebiger, technologisch sinnvoller Weise miteinander kombiniert werden. Die Beschreibung, insbesondere im Zusammenhang mit den Figuren, charakterisiert und spezifiziert die Offenbarung zusätzlich.This object is achieved with the features of claim 1. The subclaims show further developments of the disclosure. The dependent claims can be combined with one another in any technologically sensible manner. The description, in particular in connection with the figures, additionally characterizes and specifies the disclosure.
Vorgesehen ist demgemäß ein Verfahren zum Einstellen einer Sauerstoffspülmasse eines Katalysators und zur Steuerung eines Luft-Kraftstoffverhältnisses eines Verbrennungsmotors mit den Schritten:
i. Berechnung einer Sauerstoffspülmasse aus einer in den Verbrennungsmotor einfließenden Luftmenge und einer in den Verbrennungsmotor einfließenden Kraftstoffmenge sowie durch Bilden eines Integrals aus einem Anstieg einer im Katalysator gespeicherten Menge an Sauerstoff ab einem Zeitpunkt, an dem ein Abmagern eines Luft-Kraftstoffverhältnisses beginnt, bis zu einem Zeitpunkt, an dem ein von einer Lambdasonde, die stromabwärts von dem Katalysator angeordnet ist, gemessener Sauerstoffgehalt einen Grenzwert überschreitet, ii. Durchführen eines Katalysatorspülvorganges durch Anfetten des Luft- Kraftstoffverhältnisses unter Berücksichtigung der berechneten Sauerstoffspülmasse. Accordingly, a method is provided for adjusting an oxygen scavenging mass of a catalytic converter and for controlling an air-fuel ratio of an internal combustion engine, comprising the steps: i. Calculation of an oxygen scavenging mass from an amount of air flowing into the engine and an amount of fuel flowing into the engine, and by taking an integral of an increase in an amount of oxygen stored in the catalyst from a point in time when an air-fuel ratio starts to become lean to a point in time at which an oxygen content measured by a lambda sensor arranged downstream of the catalytic converter exceeds a limit value, ii. Carry out a catalytic converter flushing process by enriching the air-fuel ratio, taking into account the calculated oxygen flushing mass.
Bei der Sauerstoffspülmasse handelt es sich um eine Menge an Sauerstoff, die der Katalysator derzeit aufnehmen kann. Eine Sauerstoffspeicherkapazität an sich ist direkt nur schwer ermittelbar, weshalb die Sauerstoffspülmasse ermittelt wird. Die Sauerstoffspülmasse ist höchstens so hoch wie die Sauerstoffspeicherkapazität. Nach der Durchführung des Verfahrens steht fest, wie groß die Sauerstoffspeicherkapazität des Katalysators momentan mindestens ist (nämlich so groß wie die erfasste Sauerstoffspülmasse). Die Berechnung der Sauerstoffspülmasse erfolgt so lange, bis der von der Lambdasonde hinter dem Katalysator gemessene Sauerstoffgehalt einen oberen Grenzwert unterschreitet. Bei diesem Sauerstoffgehalt sinkt eine Spannung einer herkömmlichen Lambdasonde beispielsweise auf 0,1V bis 0,35 V. Der Katalysator nimmt gar keinen Sauerstoff mehr auf und es kommt an der Lambdasonde entsprechend viel Sauerstoff an. Ein Übergang von einer hohen Spannung von ca. 1 V auf die zum Grenzwert proportionale Spannung erfolgt dabei schlagartig in wenigen Millisekunden. Solange der Grenzwert nicht erreicht wird, nimmt der Katalysator noch Sauerstoff auf. Indem nun anspruchsgemäß das Integral der Sauerstoffmenge über der Zeit gebildet wird, kann die gespeicherte Sauerstoffspülmasse des Katalysators berechnet werden. Die Masse an Sauerstoff ist aus einer Masse an in den Verbrennungsmotor einströmenden Luftmenge und einem Anteil an eingespritzten Kraftstoff ermittelbar. The oxygen purge mass is an amount of oxygen that the catalyst can currently absorb. An oxygen storage capacity per se is difficult to determine directly, which is why the oxygen scavenging mass is determined. The oxygen scavenging mass is at most as high as the oxygen storage capacity. After the method has been carried out, it is clear how large the oxygen storage capacity of the catalytic converter is at the moment (namely as large as the detected oxygen scavenging mass). The oxygen scavenging mass is calculated until the oxygen content measured by the lambda probe downstream of the catalytic converter falls below an upper limit value. With this oxygen content, the voltage of a conventional lambda probe drops to 0.1 V to 0.35 V, for example. The catalytic converter no longer absorbs any oxygen and a corresponding amount of oxygen arrives at the lambda probe. A transition from a high voltage of approx. 1 V to the voltage proportional to the limit value occurs abruptly in a few milliseconds. As long as the limit value is not reached, the catalytic converter still absorbs oxygen. By now forming the integral of the amount of oxygen over time according to the claims, the stored oxygen scavenging mass of the catalytic converter can be calculated. The mass of oxygen can be determined from a mass of air flowing into the internal combustion engine and a proportion of injected fuel.
Das Verfahren gemäß Anspruch 1 kann gestartet werden, wenn der Verbrennungsmotor mager läuft, beispielsweise in einem Schubbetrieb. Bevorzugt kann das Verfahren während eines normalen Betriebs gestartet werden, um die derzeitige Sauerstoffspeicherkapazität zu messen. Ein normaler Betrieb liegt vor, wenn der Verbrennungsmotor bei einem stöchiometrischen
Verbrennungsverhältnis betrieben wird. Weiterhin kann das Verfahren nach einem Katalysatorspülvorgang durchgeführt werden, um zum einen Kenntnis über die Sauerstoffspülmasse zu erlangen und zum andern, um den vordefinierten Anteil der Sauerstoffspeicherkapazität einzustellen. The method according to claim 1 can be started when the internal combustion engine is running lean, for example in overrun mode. The method can preferably be started during normal operation in order to measure the current oxygen storage capacity. Normal operation is when the internal combustion engine is at stoichiometric Combustion ratio is operated. Furthermore, the method can be carried out after a catalytic converter scavenging process in order to obtain information about the oxygen scavenging mass on the one hand and to set the predefined proportion of the oxygen storage capacity on the other.
Bei einem nächsten spezifischen Verbrennungsereignis liegt danach die genaue Kenntnis über eine aktuelle Sauerstoffspeicherkapazität des Katalysators vor. Die Katalysatorspülung wird in einer Ausgestaltung nur bis zum Erreichen einer gewissen verbleibenden Sauerstoffkonzentration durchgeführt. Entsprechend dieser Ausgestaltung ist vorgesehen, dass der Katalysatorspülvorgang bis zu einem Zeitpunkt durchgeführt wird, an welchem ein vordefinierter Anteil der Sauerstoffspülmasse erhalten bleibt. Der vordefinierte Anteil ermöglicht eine optimale katalytische Umsetzung von Stickoxiden und Kohlenwasserstoffen zu Wasser, Kohlendioxid und Stickstoff. Ein Überschuss an unverbrannten Kohlenwasserstoffen, die durch eine kurzzeitige Anfettung des Luft-Kraftstoffverhältnisses entsteht, kann somit im Rahmen der verbleibenden Sauerstoffspeicherkapazität aufgefangen werden. Der Überschuss an Kraftstoff ist durch die zuvor bestimmte gesamten Sauerstoffspeicherkapazität und die Einstellung der verbleibenden Sauerstoffspeicherkapazität genau bekannt. In the case of a next specific combustion event, precise knowledge of a current oxygen storage capacity of the catalytic converter is then available. In one embodiment, the catalyst flushing is carried out only until a certain remaining oxygen concentration is reached. According to this embodiment, it is provided that the catalyst scavenging process is carried out up to a point in time at which a predefined proportion of the oxygen scavenging mass is retained. The predefined proportion enables an optimal catalytic conversion of nitrogen oxides and hydrocarbons into water, carbon dioxide and nitrogen. An excess of unburned hydrocarbons, which is caused by a brief enrichment of the air/fuel ratio, can thus be absorbed within the scope of the remaining oxygen storage capacity. The excess fuel is accurately known from the previously determined total oxygen storage capacity and the remaining oxygen storage capacity adjustment.
In der Regel, also bei normalen Betriebspunkten des Verbrennungsmotors, ist vorgesehen, dass der Verbrennungsmotor nach der Durchführung des Verfahrens bei einem stöchiometrischen Luft-Kraftstoffverhältnis betrieben wird. As a rule, that is to say at normal operating points of the internal combustion engine, provision is made for the internal combustion engine to be operated at a stoichiometric air-fuel ratio after the method has been carried out.
In einer Ausgestaltung ist vorgesehen, dass der Sauerstoffgehalt erfasst wird, indem eine Spannung an der stromabwärts von dem Katalysator angeordneten zweiten Lambdasonde gemessen wird, und wobei der Grenzwert des Sauerstoffgehalts erreicht wird, wenn die gemessene Spannung einen Grenzwert unterschreitet. In one embodiment, it is provided that the oxygen content is detected by measuring a voltage at the second lambda probe arranged downstream of the catalytic converter, and the limit value of the oxygen content is reached when the measured voltage falls below a limit value.
Zur Durchführung des Verfahrens kann eine Steuereinheit vorgesehen sein, die einen Verbrennungsmotor oder zumindest sein Luft-Kraftstoffverhältnis steuern kann. To carry out the method, a control unit can be provided which can control an internal combustion engine or at least its air/fuel ratio.
Eine Ausführungsform betrifft ein Computerprogrammprodukt mit Programmcode-Mitteln, die auf einem computerlesbaren Datenträger gespeichert sind, um das vorstehend beschriebene Verfahren durchzuführen, wenn das Computerprogrammprodukt auf einem Computer, insbesondere in einer Steuerelektronik eines Steuereinheit ausgeführt wird. Die Steuereinheit kann wie vorstehend beschrieben aus-, und weitergebildet sein.
Eine Ausführungsform betrifft ein Computerprogramm mit kodierten Anweisungen zur Durchführung des vorstehend beschriebenen Verfahrens, wenn das Computerprogramm auf einem Computer, insbesondere einer Steuerelektronik einer Steuereinheit ausgeführt wird. Die Steuereinheit kann wie vorstehend beschrieben aus- und weitergebildet sein. Das Computerprogramm kann insbesondere auf dem vorstehend beschriebenen Computerprogrammprodukt, beispielsweise eine Diskette, CD-ROM, DVD, Speicher, eine an das Internet angeschlossene Prozessoreinheit, gespeichert sein. Das Computerprogramm kann insbesondere als eine kompilierte oder noch nicht kompilierte Datenfolge ausgestaltet sein, die vorzugsweise auf einer höheren, insbesondere objektbasierten Computersprache basiert.One embodiment relates to a computer program product with program code means that are stored on a computer-readable data carrier in order to carry out the method described above when the computer program product is executed on a computer, in particular in control electronics of a control unit. The control unit can be designed and developed as described above. One embodiment relates to a computer program with encoded instructions for carrying out the method described above when the computer program is executed on a computer, in particular on control electronics of a control unit. The control unit can be designed and developed as described above. The computer program can be stored in particular on the computer program product described above, for example a floppy disk, CD-ROM, DVD, memory, a processor unit connected to the Internet. The computer program can in particular be in the form of a compiled or not yet compiled data sequence, which is preferably based on a higher, in particular object-based, computer language.
Eine Ausführungsform betrifft eine Signalfolge mit computerlesbaren Anweisungen zur Durchführung des vorstehend beschriebenen Verfahrens, wenn die Signalfolge von einem Computer, insbesondere einer Steuerelektronik einer Steuereinheit verarbeitet wird. Die Steuereinheit kann wie vorstehend beschrieben aus- und weitergebildet sein. Die Signalfolge kann insbesondere mit Hilfe des vorstehend beschriebenen Computerprogramms und/oder mit Hilfe des vorstehend beschriebenen Computerprogrammprodukts erzeugt werden. Die Signalfolge kann als elektrische Impulse und/oder elektromagnetische Welle und/oder optische Impulse drahtlos oder drahtgebunden bereitgestellt werden. One embodiment relates to a signal sequence with computer-readable instructions for carrying out the method described above when the signal sequence is processed by a computer, in particular an electronic control unit of a control unit. The control unit can be designed and developed as described above. The signal sequence can be generated in particular with the aid of the computer program described above and/or with the aid of the computer program product described above. The signal sequence can be provided wirelessly or wired as electrical pulses and/or electromagnetic waves and/or optical pulses.
Ein Mittel zur Realisierung der Verfahrensschritte im Sinne der vorliegenden Offenbarung kann hard- und/oder softwaretechnisch ausgebildet sein, insbesondere eine, vorzugsweise mit einem Speicher- und/oder Bussystem daten- bzw. signalverbundene, insbesondere digitale, Verarbeitungs-, insbesondere Steuereinheit mit Mikroprozessoren (CPU) und/oder ein oder mehrere Programme oder Programmmodule aufweisen. Die CPU kann dazu ausgebildet sein, Befehle, die als Programm implementiert sind, abzuarbeiten, Eingangssignale von einem Datenbus zu erfassen und/oder Ausgangssignale an einen Datenbus abzugeben. Das Programm kann auf einem Speichersystem abgelegt sein. Das Speichersystem kann ein oder mehrere, insbesondere verschiedene, Speichermedien, insbesondere optische, magnetische, Festkörper und/oder andere nicht-flüchtige Medien aufweisen. Das Programm kann derart beschaffen sein, dass es die hier beschriebenen Verfahren verkörpert bzw. auszuführen imstande ist, so dass die CPU die Schritte solcher Verfahren ausführen kann. In einer Ausführung sind ein oder mehrere, insbesondere alle Schritte des Verfahrens vollständig oder teilweise automatisiert durchführbar.
Kurzbeschreibung der Figuren A means for implementing the method steps within the meaning of the present disclosure can be designed in terms of hardware and/or software, in particular a processing unit, in particular a digital processing unit, in particular a control unit with microprocessors, preferably connected to a memory and/or bus system for data or signals ( CPU) and/or one or more programs or program modules. The CPU can be designed to process commands that are implemented as a program, to detect input signals from a data bus and/or to emit output signals to a data bus. The program can be stored on a storage system. The storage system can have one or more, in particular different, storage media, in particular optical, magnetic, solid and/or other non-volatile media. The program may be arranged to embody or be capable of performing the methods described herein such that the CPU can perform the steps of such methods. In one embodiment, one or more, in particular all, steps of the method can be carried out completely or partially in an automated manner. Brief description of the characters
Die hierin beschriebenen Zeichnungen dienen nur zu Veranschaulichungszwecken und sollen den Umfang der vorliegenden Offenbarung in keiner Weise einschränken. Es zeigen: The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure in any way. Show it:
Fig. 1 : schematisch einen Verbrennungsmotor mit einem Abgastrakt und einem Katalysator;1 shows a schematic of an internal combustion engine with an exhaust system and a catalytic converter;
Fig. 2: einen zeitlichen Verlauf eines Luft-Kraftstoffverhältnisses (oberer Graph), parallel hierzu einen zeitlichen Verlauf einer Spannung U an einer stromabwärts von dem Katalysator angeordneten Lambdasonde 13 (mittlerer Graph) und parallel zu den oberen beiden Graphen einen zeitlichen Verlauf einer Sauerstoffspeicherkapazität OSC (unterer Graph); und Fig. 2: a time profile of an air-fuel ratio (upper graph), parallel to this a time profile of a voltage U at a lambda probe 13 arranged downstream of the catalytic converter (middle graph) and parallel to the two upper graphs a time profile of an oxygen storage capacity OSC (lower graph); and
Fig. 3: drei Verfahrensschritte eines Verfahrens, das in einer Steuereinheit implementiert sein kann, um das Luft-Kraftstoffverhältnis zu steuern. Fig. 3: three method steps of a method that can be implemented in a control unit to control the air-fuel ratio.
Die folgende Beschreibung ist dem Wesen nach lediglich veranschaulichend. Der Klarheit halber sind in den Zeichnungen zur Bezeichnung ähnlicher Elemente dieselben Bezugszeichen verwendet. Es ist festzustellen, dass einige Schritte innerhalb eines Verfahrens in anderer Reihenfolge ausgeführt werden können, ohne die Prinzipien der vorliegenden Offenbarung zu ändern. Schritte des Verfahrens können Multiplikationen, Summierungen und Selektionen sowie Zuordnungen sein, zum Beispiel Zuordnung von Ausgangswerten zu Eingangswerten in Kennfeldern. The following description is merely illustrative in nature. For the sake of clarity, the same reference numbers will be used in the drawings to designate similar elements. It should be appreciated that some steps within a method may be performed in a different order without changing the principles of the present disclosure. Steps of the method can be multiplications, summations and selections as well as assignments, for example assignment of output values to input values in characteristic diagrams.
Figur 1 zeigt schematisch einen Verbrennungsmotor 10 mit einem Abgastrakt 15 und einem Katalysator 11 . Der Verbrennungsmotor 10 kann über eine Steuereinheit 14 geregelt werden. Zumindest ein Luft-Kraftstoffverhältnis kann von der Steuereinheit 14 eingestellt werden, indem mehr oder weniger Kraftstoff eingespritzt wird. Die Steuereinheit 14 ist hierfür in nicht dargestellter Weise signalübertragend mit Einspritzdüsen 17 oder mit einerweiteren nicht dargestellten Steuereinheit für Einspritzdüsen 17 signalübertragend verbunden, um diese zu steuern. Ferner ist eine Drosselklappe 19 vorgesehen sowie ein Luftmengenmesser 18. Eine nicht dargestellte Aufladeeinrichtung (Turbolader oder Kompressor) kann ebenfalls vorgesehen sein. Über die Drosselklappe 19 kann eine Luftmenge beeinflusst werden, die in den Verbrennungsmotor 10 gelangt. Die in den Verbrennungsmotor 10 einströmende Luftmenge wird an dem Luftmengenmesser 18 gemessen. Eine an den Einspritzdüsen 17 eingespritzte Menge an Kraftstoff basiert auf der einströmenden Luftmenge. Üblicherweise arbeitet der Verbrennungsmotor 10 bei einem Luft-Kraftstoffverhältnis von 1 , dem stöchiometrischen Luft-
Kraftstoffverhältnis. Man kann nun über die Luftmenge bzw. die an den Einspritzdüsen 17 eingespritzte Menge an Kraftstoff das Luft-Kraftstoffverhältnis erhöhen (abmagern) oder verringern (anfetten). Ein sich über der Zeit änderndes Luft-Kraftstoffverhältnis AFR zeigt Figur 2 im oberen Graphen. Das Luft-Kraftstoffverhältnis AFR liegt zwischen einem Zeitpunkt t1 und einem Zeitpunkt t2 im mageren Bereich, das Luft-Kraftstoffverhältnis AFR liegt bei 1 ,2. Es gibt demnach einen Überschuss an Luft, also mehr Sauerstoff, als zur Oxidation des eingespritzten Kraftstoffs notwendig ist. Der Katalysator 11 nimmt den Sauerstoff im Rahmen seiner derzeitigen Sauerstoffspeicherkapazität auf. Die Sauerstoffspeicherkapazität des Katalysators 11 verändert sich ständig, da sie von der Temperatur abhängig ist. FIG. 1 schematically shows an internal combustion engine 10 with an exhaust tract 15 and a catalytic converter 11 . Internal combustion engine 10 can be regulated via a control unit 14 . At least one air-fuel ratio can be adjusted by the control unit 14 by injecting more or less fuel. For this purpose, the control unit 14 is connected in a manner that is not shown to transmit signals to injection nozzles 17 or to a further control unit for injection nozzles 17 that is not shown, in order to control them. A throttle valve 19 is also provided, as is an air flow meter 18. A charging device (turbocharger or compressor), not shown, can also be provided. A quantity of air which enters the internal combustion engine 10 can be influenced via the throttle flap 19 . The amount of air flowing into internal combustion engine 10 is measured at air flow meter 18 . An amount of fuel injected at the injectors 17 is based on the inflowing air amount. Typically, the internal combustion engine 10 operates at an air-fuel ratio of 1, the stoichiometric air fuel ratio. The air-fuel ratio can now be increased (lean) or reduced (enriched) via the air quantity or the quantity of fuel injected at the injection nozzles 17 . The upper graph of FIG. 2 shows an air-fuel ratio AFR that changes over time. The air/fuel ratio AFR is in the lean range between a point in time t1 and a point in time t2; the air/fuel ratio AFR is 1.2. There is therefore an excess of air, i.e. more oxygen, than is required to oxidize the injected fuel. The catalytic converter 11 absorbs the oxygen within the scope of its current oxygen storage capacity. The oxygen storage capacity of the catalyst 11 changes constantly because it depends on the temperature.
Die Steuereinheit 14 ist ferner signalübertragend mit einer stromaufwärts von dem Katalysator 11 angeordneten Lambdasonde 12 und einer stromabwärts von dem Katalysator 11 angeordneten Lambdasonde 13 verbunden. Die Lambdasonden 12 und 13 sind dazu ausgestaltet, Sauerstoff im Abgas zu detektieren, üblicherweise durch eine sich proportional zum Sauerstoffgehalt verhaltende elektrische Spannung. The control unit 14 is also connected in a signal-transmitting manner to a lambda probe 12 arranged upstream of the catalytic converter 11 and to a lambda probe 13 arranged downstream of the catalytic converter 11 . Lambda sensors 12 and 13 are designed to detect oxygen in the exhaust gas, usually by means of an electrical voltage that is proportional to the oxygen content.
Figur 2 zeigt drei parallel ablaufende Verläufe von Parametern. Die Parameter können bei der Durchführung des offenbarungsgemäßen Verfahrens an dem Verbrennungsmotor 10 bzw. dem Katalysator 11 und der Lambdasonde 13 entsprechend Figur 1 auftreten. Die elektrische Spannung U an den Lambdasonden 12 und 13 ist umso geringer, je höher der Sauerstoffgehalt im Abgas ist. FIG. 2 shows three parallel progressions of parameters. When the method according to the disclosure is carried out, the parameters can occur on the internal combustion engine 10 or the catalytic converter 11 and the lambda probe 13 in accordance with FIG. The electrical voltage U at the lambda probes 12 and 13 is lower, the higher the oxygen content in the exhaust gas.
Zu einem Zeitpunkt tO wird noch eine Anfettung des Luft-Kraftstoffverhältnisses AFR durchgeführt, eventuell erfolgt dies nach einem zuvor erfolgten, nicht dargestellten Vorgang, bei dem der Verbrennungsmotor mit einem Luftüberschuss gefahren wurde. Dabei reichert sich Sauerstoff im Katalysator 11 an. At a point in time tO, the air-fuel ratio AFR is also enriched; this may take place after a previously performed process, not shown, in which the internal combustion engine was run with excess air. In the process, oxygen accumulates in the catalytic converter 11 .
Zu einem Zeitpunkt t1 erfolgt eine Abmagerung des Luft-Kraftstoffverhältnisses AFR. Das spiegelt sich zeitgleich im Verlauf einer Spannung U an, welche an der stromabwärts vom Katalysator 11 angeordneten Lambdasonde 13 gemessen wird. Nicht direkt gemessen werden kann die im unteren Graphen dargestellte Sauerstoffspeicherkapazität OSC. Die Sauerstoffspeicherkapazität OSC ist jedoch indirekt ermittelbar. Ab einer gewissen Zeit ist nämlich eine maximale Sauerstoffspeicherkapazität OSC des Katalysators 11 erreicht. Zu diesem Zeitpunkt entnimmt der Katalysator 11 dem Abgas keinen Sauerstoff mehr. Schlagartig wird dies an der Lambdasonde 13 zu dem Zeitpunkt t2 deutlich, denn die Spannung U sinkt plötzlich ab. In der Steuereinheit 14 kann ein entsprechender Marker gesetzt werden, der zu
einem Zustand korrespondiert, in dem der Katalysator 11 mit Sauerstoff beladen ist und nicht mehr Sauerstoff aufnehmen kann. At a point in time t1, the air-fuel ratio AFR becomes leaner. This is reflected at the same time in the course of a voltage U, which is measured at the lambda probe 13 arranged downstream of the catalytic converter 11 . The oxygen storage capacity OSC shown in the graph below cannot be measured directly. However, the oxygen storage capacity OSC can be determined indirectly. This is because a maximum oxygen storage capacity OSC of the catalytic converter 11 is reached after a certain time. At this point in time, the catalytic converter 11 no longer extracts oxygen from the exhaust gas. This suddenly becomes clear at the lambda probe 13 at the point in time t2, because the voltage U suddenly drops. In the control unit 14, a corresponding marker can be set to corresponds to a state in which the catalyst 11 is loaded with oxygen and can no longer absorb oxygen.
Die Steuereinheit 14 errechnet aus einem Integral einer Sauerstoffspülmasse 05 über der Zeit zwischen dem Zeitpunkt tO bis zu dem Zeitpunkt t1 die derzeitige maximale Sauerstoffspeicherkapazität OSC des Katalysators 11. Der reguläre stöchiometrische Betrieb des Verbrennungsmotors 10 wird noch nicht initiiert, da bei vollständiger Sättigung der Sauerstoffspeicherkapazität OSC Stickstoffe NOX nicht mehr reduziert werden. Daher initiiert die Steuereinheit 14 eine Anreicherung des Luft-Kraftstoffverhältnisses AFR (siehe oberer Graph in Figur 2) und zwar so lange, bis ein verbleibender Anteil 16 der Sauerstoffspülmasse 06 noch im Katalysator 11 gespeichert ist. Dadurch kann eine verbleibende Sauerstoffmenge 16 im Katalysator 11 noch aufgenommen werden, so dass der Katalysator 11 bestimmungsgemäß Kohlenmonoxid, Kohlenwasserstoffe und Stickoxide in Kohlendioxid, Wasser und neutralen Stickstoff umwandeln kann. Weiterhin kann der Verbrennungsmotor 10 kurzzeitig angefettet betrieben werden und es verbleibt dann genügend Sauerstoff zur Reduzierung von ungebranntem Kraftstoff im Katalysator 11. Durch das hierin offenbarte Verfahren kann die Berechnung der Sauerstoffspeicherkapazität OSC minutenaktuell bzw. sekundenaktuell am Katalysator 11 erfolgen. Die Steuereinheit 14 ist dadurch in der Lage, stets genau die Menge an Kraftstoff zu steuern, die am Katalysator 11 gerade reduziert werden kann. Es kann demnach kein Zustand mehr eintreten, in dem der Katalysator 11 die in ihn eingeleiteten Stickoxide, Kohlenwasserstoffe und Kohlenmonoxid nicht in Wasser, Kohlendioxid und Sauerstoff umwandeln kann. Dementsprechend ist es vorteilhaft aber nicht zwingend, dass die Berechnung der Sauerstoffspeicherkapazität unmittelbar vor einem Katalysatorspülvorgang erfolgt. Je kürzer der zeitliche Abstand zwischen dem Erfassen der Sauerstoffspeicherkapazität und dem Katalysatorspülvorgang ist, desto präziser kann die verbleibende Sauerstoffspeicherkapazität 16 eingestellt werden. The control unit 14 calculates the current maximum oxygen storage capacity OSC of the catalytic converter 11 from an integral of an oxygen scavenging mass 05 over the time between the time tO and the time t1. The regular stoichiometric operation of the internal combustion engine 10 is not yet initiated, since when the oxygen storage capacity OSC Nitrogen NOX can no longer be reduced. The control unit 14 therefore initiates an enrichment of the air-fuel ratio AFR (see upper graph in FIG. 2) until a remaining portion 16 of the oxygen scavenging mass 06 is still stored in the catalytic converter 11. As a result, a remaining amount of oxygen 16 in the catalytic converter 11 can still be absorbed, so that the catalytic converter 11 can convert carbon monoxide, hydrocarbons and nitrogen oxides into carbon dioxide, water and neutral nitrogen as intended. Furthermore, the internal combustion engine 10 can be operated briefly enriched and sufficient oxygen then remains in the catalytic converter 11 to reduce unburned fuel. The control unit 14 is thus able to always precisely control the amount of fuel that can just be reduced at the catalytic converter 11 . Accordingly, a state can no longer occur in which the catalytic converter 11 cannot convert the nitrogen oxides, hydrocarbons and carbon monoxide introduced into it into water, carbon dioxide and oxygen. Accordingly, it is advantageous, but not essential, for the oxygen storage capacity to be calculated immediately before a catalytic converter flushing process. The shorter the time interval between the detection of the oxygen storage capacity and the catalytic converter flushing process, the more precisely the remaining oxygen storage capacity 16 can be set.
Die Sauerstoffspeicherkapazität OSC kann durch das Verfahren im Betrieb des Verbrennungsmotors 11 stets gemessen werden. Nach einem Betrieb des Verbrennungsmotors 10 mit einem Sauerstoffüberschuss kann der Katalysator 11 stets so lange gespült werden, bis der Anteil 16 der Sauerstoffspülmasse noch im Katalysator 11 gespeichert ist. The oxygen storage capacity OSC can always be measured by the method in the operation of the engine 11 . After the internal combustion engine 10 has been operated with an excess of oxygen, the catalytic converter 11 can always be flushed until the proportion 16 of the oxygen flushing mass is still stored in the catalytic converter 11 .
Figur 3 zeigt drei Schritte eines Verfahrens, die in der Steuereinheit 14 entsprechend Figur 1 durchlaufen werden können, um die Sauerstoffspeicherkapazität OSC zu ermitteln.
In Schritt 301 erfolgt eine Berechnung einer Sauerstoffspülmasse aus einer in den Verbrennungsmotor einfließenden Luftmenge und einer in den Verbrennungsmotor 10 einfließenden Kraftstoffmenge sowie durch Bilden eines Integrals aus einem Anstieg einer im Katalysator 11 gespeicherten Menge an Sauerstoff ab einem Zeitpunkt t1 , an dem ein Abmagern eines Luft-Kraftstoffverhältnisses beginnt, bis zu einem Zeitpunkt t2, an dem ein von einer Lambdasonde 13, die stromabwärts von dem Katalysator 11 angeordnet ist, gemessener Sauerstoffgehalt einen Grenzwert überschreitet. FIG. 3 shows three steps of a method that can be run through in the control unit 14 according to FIG. 1 in order to determine the oxygen storage capacity OSC. In step 301, an oxygen scavenging mass is calculated from a quantity of air flowing into the internal combustion engine and a quantity of fuel flowing into the internal combustion engine 10 and by forming an integral from an increase in a quantity of oxygen stored in the catalytic converter 11 from a point in time t1 at which leaning of an air -Fuel ratio begins until a point in time t2, at which an oxygen content measured by a lambda probe 13, which is arranged downstream of the catalytic converter 11, exceeds a limit value.
Der Grenzwert liegt vor, wenn die Spannung U an der Lambdasonde klein wird. Der Grenzwert korrespondiert zu der Spannung UG an der Lambdasonde 13. Diese kann im Bereich zwischen 0,01 und 0,2 V, insbesondere zwischen 0,2 und 0,1 V liegen. The limit value is present when the voltage U at the lambda probe is low. The limit value corresponds to the voltage UG at the lambda probe 13. This can be in the range between 0.01 and 0.2 V, in particular between 0.2 and 0.1 V.
In Schritt 302 erfolgt ein Durchführen eines Katalysatorspülvorganges durch Anfetten des Luft- Kraftstoffverhältnisses bis zu einem Zeitpunkt t3, an welchem ein vordefinierter Anteil 16 der Sauerstoffspülmasse 05 erhalten bleibt. Der vordefinierte Anteil 16 ermöglicht eine optimale katalytische Umsetzung von Stickoxiden und Kohlenwasserstoffen zu Wasser und Stickstoff.In step 302, a catalytic converter flushing process is carried out by enriching the air/fuel ratio up to a point in time t3, at which a predefined proportion 16 of the oxygen flushing mass 05 is retained. The predefined proportion 16 enables an optimal catalytic conversion of nitrogen oxides and hydrocarbons into water and nitrogen.
In Schritt 303 erfolgt eine Beendigung des Anfettens des Luft-Kraftstoffverhältnisses AFR ab dem Zeitpunkt t3, an welchem ein vordefinierter Anteil 16 der Sauerstoffspülmasse 05 erhalten bleibt und ferner ein Betrieb des Verbrennungsmotors 10 bei einem stöchiometrischen Luft- Kraftstoffverhältnis. Bei dem stöchiometrischen Luft-Kraftstoffverhältnis von 1 arbeitet der Katalysator 11 im regulären Betrieb des Verbrennungsmotors 10. In step 303, the enrichment of the air-fuel ratio AFR is ended from time t3, at which a predefined proportion 16 of the oxygen scavenging mass 05 is retained, and internal combustion engine 10 is also operated at a stoichiometric air-fuel ratio. At the stoichiometric air-fuel ratio of 1, the catalytic converter 11 works in the regular operation of the internal combustion engine 10.
Gleichwohl zumindest ein Ausführungsbeispiel in der vorangegangenen Beschreibung sowie der Figurenbeschreibung dargestellt wurde, sollte man anerkennen, dass eine hohe Anzahl an Variationen existiert. Weiterhin sollte man anerkennen, dass das Ausführungsbeispiel bzw. die Ausführungsbeispiele nur Beispiele sind und dass sie nicht dazu dienen, den Schutzbereich, die Anwendbarkeit oder die genaue Ausgestaltung in irgendeiner Art und Weise zu beschränken. Vielmehr stellen die Beschreibung sowie die Figurenbeschreibung für den Fachmann eine nützliche Anleitung zur Implementierung mindestens einer Ausführungsform bereit, dabei sollte klar sein, dass verschiedene Änderungen in der Form und Funktion der beschriebenen Merkmale vorgenommen werden können, ohne den Schutzbereich der Ansprüche und deren Äquivalente zu verlassen.
Bezugszeichenliste: Although at least one exemplary embodiment has been presented in the foregoing description as well as the description of the figures, it should be recognized that a large number of variations exist. Furthermore, it should be appreciated that the embodiment(s) are only examples and are not intended to limit the scope, applicability, or precise configuration in any way. Rather, the description and description of the figures provide useful guidance for those skilled in the art for implementing at least one embodiment, it being understood that various changes in form and function of the described features may be made without departing from the scope of the claims and their equivalents . Reference list:
10 Verbrennungsmotor 10 internal combustion engine
11 Katalysator 11 catalyst
12 Lambdasonde 12 lambda probe
13 Lambdasonde 13 lambda probe
14 Steuereinheit 14 control unit
15 Abgastrakt 15 exhaust tract
16 Anteil 16 share
17 Einspritzdüsen 17 injectors
18 Luftmengenmesser 18 air flow meter
19 Drosselklappe 19 Throttle
301 Schritt 301 step
302 Schritt 302 step
303 Schritt 303 step
AFR Luft-Kraftstoffverhältnisses AFR air-fuel ratio
OSC Sauerstoffspeicherkapazität OSC oxygen storage capacity
05 Sauerstoffspülmasse 05 Oxygen Purge Mass
06 Sauerstoffspülmasse 06 Oxygen Purge Mass
U Spannung voltage
UG zu Grenzwert korrespondierende Spannung tO Zeitpunkt t1 Zeitpunkt t2 Zeitpunkt t4 Zeitpunkt
UG Voltage tO corresponding to limit value Time t1 Time t2 Time t4 Time
Claims
1. Verfahren zum Einstellen einer Sauerstoffspülmasse (05, 06, 16) eines Katalysators (11) und zur Steuerung eines Luft-Kraftstoffverhältnisses (AFR) eines Verbrennungsmotors (10) mit den Schritten: iii. Berechnung einer Sauerstoffspülmasse (05) aus einer in den Verbrennungsmotor (10) einfließenden Luftmenge und einer in den Verbrennungsmotor (10) einfließenden Kraftstoffmenge sowie durch Bilden eines Integrals aus einem Anstieg einer im Katalysator (11) gespeicherten Menge an Sauerstoff ab einem Zeitpunkt (t1), an dem ein Abmagern eines Luft-Kraftstoffverhältnisses (AFR) beginnt, bis zu einem Zeitpunkt (t2), an dem ein von einer Lambdasonde (13), die stromabwärts von dem Katalysator (11) angeordnet ist, gemessener Sauerstoffgehalt einen Grenzwert überschreitet, iv. Durchführen eines Katalysatorspülvorganges durch Anfetten des Luft- Kraftstoffverhältnisses (AFR) unter Berücksichtigung der berechneten Sauerstoffspülmasse (05). Claims 1. A method for adjusting an oxygen scavenging mass (05, 06, 16) of a catalytic converter (11) and for controlling an air-fuel ratio (AFR) of an internal combustion engine (10), comprising the steps of: iii. Calculation of an oxygen scavenging mass (05) from a quantity of air flowing into the internal combustion engine (10) and a quantity of fuel flowing into the internal combustion engine (10) and by forming an integral from an increase in a quantity of oxygen stored in the catalytic converter (11) from a point in time (t1) , at which an enleaning of an air-fuel ratio (AFR) begins, up to a point in time (t2) at which an oxygen content measured by a lambda sensor (13) arranged downstream of the catalytic converter (11) exceeds a limit value, iv . Carrying out a catalyst scavenging process by enriching the air-fuel ratio (AFR) taking into account the calculated oxygen scavenging mass (05).
2. Verfahren nach Anspruch 1 , wobei der Katalysatorspülvorgang bis zu einem Zeitpunkt (t3) durchgeführt wird, an welchem ein vordefinierter Anteil (16) der Sauerstoffspülmasse (05) erhalten bleibt. 2. The method according to claim 1, wherein the catalyst flushing process is carried out up to a point in time (t3) at which a predefined proportion (16) of the oxygen flushing mass (05) is retained.
3. Verfahren nach einem der Ansprüche 1 und/oder 2, wobei der Verbrennungsmotor (10) nach der Durchführung des Verfahrens bei einem stöchiometrischen Luft- Kraftstoffverhältnis (AFR) betrieben wird. 3. The method according to any one of claims 1 and / or 2, wherein the internal combustion engine (10) after performing the method at a stoichiometric air-fuel ratio (AFR) is operated.
4. Verfahren nach einem der Ansprüche 1 bis 3, wobei der Sauerstoffgehalt erfasst wird, indem eine Spannung (U) an der stromabwärts von dem Katalysator (11) angeordneten zweiten Lambdasonde (13) gemessen wird, und wobei der Grenzwert des Sauerstoffgehalts erreicht wird, wenn die gemessene Spannung (U) einen Grenzwert (UG) unterschreitet.
4. The method according to any one of claims 1 to 3, wherein the oxygen content is detected by measuring a voltage (U) at the downstream of the catalytic converter (11) arranged second lambda probe (13), and wherein the limit value of the oxygen content is reached, if the measured voltage (U) falls below a limit value (UG).
5. Steuereinheit (14), welche signalübertragend mit einem Verbrennungsmotor (10) und einer Lambdasonde (13) verbunden ist und welche dazu ausgestaltet ist, ein verfahren entsprechend den Ansprüche 1 bis 4 auszuführen. 5. Control unit (14) which is connected in a signal-transmitting manner to an internal combustion engine (10) and a lambda probe (13) and which is designed to carry out a method according to claims 1 to 4.
6. Computerprogrammprodukt mit Programmcode-Mitteln, die auf einem computerlesbaren Datenträger gespeichert sind, um das Verfahren nach einem der Ansprüche 1 bis 4 durchzuführen, wenn das Computerprogrammprodukt auf einem Computer, insbesondere einer Steuereinheit (14) nach Anspruch 5 ausgeführt wird. 6. Computer program product with program code means, which are stored on a computer-readable data carrier, in order to carry out the method according to one of claims 1 to 4, when the computer program product is executed on a computer, in particular a control unit (14) according to claim 5.
7. Computerprogramm mit kodierten Anweisungen zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 4, wenn das Computerprogramm auf einem Computer, insbesondere einem Computer in einer Steuereinheit (14) nach Anspruch 5 ausgeführt wird. 7. Computer program with coded instructions for carrying out the method according to one of claims 1 to 4, when the computer program is executed on a computer, in particular a computer in a control unit (14) according to claim 5.
8. Signalfolge mit computerlesbaren Anweisungen zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 4, wenn die Signalfolge von einem Computer, insbesondere einer Steuereinheit (14) nach Anspruch 5 verarbeitet wird.
8. signal sequence with computer-readable instructions for carrying out the method according to any one of claims 1 to 4, when the signal sequence is processed by a computer, in particular a control unit (14) according to claim 5.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102021203184.6A DE102021203184A1 (en) | 2021-03-30 | 2021-03-30 | Method for adjusting an oxygen scavenging mass of a catalytic converter and for controlling an air-fuel ratio of an internal combustion engine, taking into account the detected oxygen scavenging mass |
PCT/EP2022/052724 WO2022207162A1 (en) | 2021-03-30 | 2022-02-04 | Method for adjusting an oxygen flushing mass of a catalytic converter and for controlling an air-fuel ratio of an internal combustion engine taking into account the detected oxygen flushing mass |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4314519A1 true EP4314519A1 (en) | 2024-02-07 |
Family
ID=80682774
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP22708416.7A Pending EP4314519A1 (en) | 2021-03-30 | 2022-02-04 | Method for adjusting an oxygen flushing mass of a catalytic converter and for controlling an air-fuel ratio of an internal combustion engine taking into account the detected oxygen flushing mass |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP4314519A1 (en) |
CN (1) | CN116997709A (en) |
DE (1) | DE102021203184A1 (en) |
WO (1) | WO2022207162A1 (en) |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4128823C2 (en) * | 1991-08-30 | 2000-06-29 | Bosch Gmbh Robert | Method and device for determining the storage capacity of a catalytic converter |
US5842340A (en) * | 1997-02-26 | 1998-12-01 | Motorola Inc. | Method for controlling the level of oxygen stored by a catalyst within a catalytic converter |
US7198952B2 (en) * | 2001-07-18 | 2007-04-03 | Toyota Jidosha Kabushiki Kaisha | Catalyst deterioration detecting apparatus and method |
DE102004009615B4 (en) | 2004-02-27 | 2008-03-13 | Siemens Ag | Method for determining the current oxygen loading of a 3-way catalytic converter of a lambda-controlled internal combustion engine |
DE102005057957A1 (en) | 2005-12-05 | 2007-06-06 | Robert Bosch Gmbh | Monitoring exhaust gas cleaning system of internal combustion engine, involves detection of pre-control error by changing time of jump in signal routing of exhaust gas probe |
DE102010033335B4 (en) * | 2010-08-04 | 2020-10-22 | Audi Ag | Method for determining the oxygen storage capacity of an oxygen storage device assigned to a catalyst |
DE112011105110B4 (en) | 2011-03-28 | 2017-08-31 | Toyota Jidosha Kabushiki Kaisha | Apparatus for detecting an imbalance anomaly in an air-fuel ratio between cylinders in a multi-cylinder internal combustion engine |
US9441566B2 (en) | 2013-03-29 | 2016-09-13 | Honda Motor Co., Ltd. | Exhaust emission purification control device for engine |
DE102015011867B4 (en) * | 2015-09-10 | 2018-10-04 | Audi Ag | Method for operating a drive device and corresponding drive device |
KR101734713B1 (en) | 2015-12-10 | 2017-05-24 | 현대자동차주식회사 | Three Way Catalytic Control Method and System for Decreasing Fuel Consumption and Vehicle thereof |
-
2021
- 2021-03-30 DE DE102021203184.6A patent/DE102021203184A1/en active Pending
-
2022
- 2022-02-04 WO PCT/EP2022/052724 patent/WO2022207162A1/en active Application Filing
- 2022-02-04 EP EP22708416.7A patent/EP4314519A1/en active Pending
- 2022-02-04 CN CN202280022520.5A patent/CN116997709A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
CN116997709A (en) | 2023-11-03 |
DE102021203184A1 (en) | 2022-10-06 |
WO2022207162A1 (en) | 2022-10-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE102008042549B4 (en) | Method and device for diagnosing an exhaust gas probe | |
EP2791493B1 (en) | Method and apparatus for monitoring exhaust gas sensor dynamics | |
DE102018215627A1 (en) | Method for operating an exhaust aftertreatment system of an internal combustion engine and exhaust aftertreatment system | |
EP2807362B1 (en) | Method for determining a dead time of an exhaust gas sensor of an internal combustion engine | |
DE102016204323B4 (en) | Method for determining a corrected nitrogen oxide value and ammonia value in an internal combustion engine | |
DE102019114108A1 (en) | OXYGEN SENSOR DIAGNOSIS | |
DE102013201228A1 (en) | Method and device for determining the oxygen storage capacity of an emission control system | |
DE102016200158A1 (en) | Method for monitoring an exhaust aftertreatment system of an internal combustion engine and control device for an exhaust aftertreatment system | |
DE102012111596A1 (en) | Apparatus and method for controlling emissions in an internal combustion engine | |
EP2238321A1 (en) | Method and controller for checking an exhaust gas aftertreatment system of an internal combustion engine | |
EP1255917B1 (en) | METHOD AND DEVICE FOR DETECTING A NOx CONCENTRATION OF AN EXHAUST GAS STREAM PERTAINING TO A COMBUSTION ENGINE | |
DE102015200762A1 (en) | Method for monitoring an exhaust aftertreatment system of an internal combustion engine and control device for an exhaust aftertreatment system | |
DE102015200751A1 (en) | Method for monitoring an exhaust aftertreatment system of an internal combustion engine and control device for an exhaust aftertreatment system | |
DE102007009873B4 (en) | Method for detecting the occurrence of cross-sensitivities in an exhaust gas sensor | |
DE102004051747A1 (en) | Internal-combustion engine operation comprises determining nitrogen oxide concentration, fill level, and operating temperature of the nitrogen oxide accumulator catalyst and correcting a signal off set | |
WO2017207208A1 (en) | Method, device for operating a nitrogen oxide sensor, computer program, and computer program product | |
EP4314519A1 (en) | Method for adjusting an oxygen flushing mass of a catalytic converter and for controlling an air-fuel ratio of an internal combustion engine taking into account the detected oxygen flushing mass | |
DE102016210143A1 (en) | A method for determining an aging state of a NOx storage catalyst of an exhaust aftertreatment system of a designed for lean operation internal combustion engine and control device | |
DE10010745A1 (en) | Catalyst system monitoring method for internal combustion engine of vehicle, involves processing primary status parameters and secondary parameters using artificial neuronal network | |
DE102012200032A1 (en) | Method for dynamic-diagnosis of sensors of internal combustion engine, involves determining maximum inclination of step response of closed loop for sensor, where dynamic-diagnosis of sensor is performed based on determined time constant | |
EP1434049B1 (en) | Method of and device for monitoring the NOx signal of an NOx sensor | |
DE102012207639A1 (en) | Method for dynamic diagnosis of e.g. wide band lambda probe in exhaust gas passage of petrol engine in car, involves changing dynamic parameters of exhaust gas probe in relation to nominal values based on result of mathematical formula | |
EP1565649B1 (en) | Method for determining the quantity of fuel injected into an internal combustion engine | |
DE102012221551A1 (en) | Method for operating exhaust system for internal combustion engine, involves operating exhaust system partially in diagnostic mode, in which rich exhaust gas atmosphere is present in area of hydrocarbon sensor | |
EP1331372B1 (en) | Method and apparatus for operating a NOx storage catalyst according to exhaust gas norms and for aging diagnosis of the catalyst |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20230724 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) |