EP1581729A1 - Verfahren zur steuerung einer verbrennungskraftmaschine sowie magerlauff hige verbrennungskraftmaschine - Google Patents
Verfahren zur steuerung einer verbrennungskraftmaschine sowie magerlauff hige verbrennungskraftmaschineInfo
- Publication number
- EP1581729A1 EP1581729A1 EP03795912A EP03795912A EP1581729A1 EP 1581729 A1 EP1581729 A1 EP 1581729A1 EP 03795912 A EP03795912 A EP 03795912A EP 03795912 A EP03795912 A EP 03795912A EP 1581729 A1 EP1581729 A1 EP 1581729A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- internal combustion
- combustion engine
- catalyst
- lambda value
- transition phase
- 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.)
- Granted
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000003054 catalyst Substances 0.000 claims abstract description 41
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 36
- 239000001301 oxygen Substances 0.000 claims abstract description 36
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 35
- 230000007704 transition Effects 0.000 claims abstract description 34
- 230000003197 catalytic effect Effects 0.000 claims description 57
- 239000007789 gas Substances 0.000 claims description 31
- 239000000446 fuel Substances 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 7
- 229910000510 noble metal Inorganic materials 0.000 claims description 6
- 239000012041 precatalyst Substances 0.000 claims description 5
- 230000003111 delayed effect Effects 0.000 claims description 2
- 230000000977 initiatory effect Effects 0.000 claims 1
- 229930195733 hydrocarbon Natural products 0.000 description 9
- 150000002430 hydrocarbons Chemical class 0.000 description 7
- 229910002091 carbon monoxide Inorganic materials 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 238000011144 upstream manufacturing Methods 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- -1 hydrocarbons HC Chemical class 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000001052 transient effect Effects 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
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
-
- 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
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/12—Introducing corrections for particular operating conditions for deceleration
- F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
- F02D41/126—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off transitional corrections at the end of the cut-off period
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
Definitions
- the invention relates to a method for controlling an internal combustion engine and a lean-burn internal combustion engine with the features mentioned in the preamble of claim 1 and 18, respectively.
- the exhaust gas is passed over at least one catalytic converter, which converts one or more pollutant components of the exhaust gas.
- Catalytic converter which converts one or more pollutant components of the exhaust gas.
- Oxidation catalysts promote the oxidation of unburned hydrocarbons (HC) and carbon monoxide (CO), while reduction catalysts support a reduction of nitrogen oxides (NO x ) in the exhaust gas.
- 3-way catalysts are used to catalyze the conversion of the three aforementioned components (HC, CO, NO x ) at the same time.
- Storage catalysts for example NO x storage catalysts, are also known.
- the NO x storage catalytic converters used in lean-burn gasoline engines for exhaust gas purification show the current level of development compared to conventional 3-
- Catalyst technology therefore requires special efforts to limit the Thermal stress on these catalysts.
- measures are considered that lead to a lowering of the stationary temperature level, such as exhaust gas cooling or a reduction in the residual oxygen content of the exhaust gases by optimizing the combustion process.
- measures that reduce the load during transient engine operation such as the optimization of the application with regard to HC peaks, make sense here.
- High-temperature cycles with overrun fuel cut-off phases are particularly critical with regard to catalyst aging.
- the main causes are the high oxygen concentrations, which can lead to a reduction in the conversion performance of the catalysts due to oxidation and sintering processes. It may be necessary to prohibit overrun fuel cutoff at very high catalyst temperatures.
- Another problem with regard to the thermal load on the catalytic converter arises during the transition from a fuel cut-off phase to fired engine operation if a substoichiometric mixture composition is immediately set.
- the oxygen storage of the catalytic converter is filled completely, that is, oxygen is temporarily stored in the catalytic converter coating or washcoat. If the catalytic converter is loaded with very low-oxygen exhaust gas when it is reinserted - for example during a subsequent full load acceleration - the partial pressure difference leads to a very rapid release of the stored oxygen.
- the invention is therefore based on the object of providing a method for controlling an internal combustion engine having at least one catalytic converter arranged in an exhaust gas duct of the internal combustion engine and a corresponding internal combustion engine in which oxygen is present during the transition phase after an overrun cut-off phase and / or an operating phase is stored in the catalytic converter, thermal load peaks of the at least one catalytic converter can be reliably avoided by exothermic processes.
- This object is achieved by a method and an internal combustion engine with the features mentioned in claims 1 and 18, respectively.
- the exhaust gas temperatures can briefly be above predetermined limit temperatures and the higher residual oxygen content of the exhaust gases can cause an increased basic exotherm. Overall, however, the rapid emptying of the oxygen storage and thus also an abrupt release of energy, which would lead to an excessive temperature peak or load on the catalytic converter, is advantageously reliably prevented.
- the sub-stoichiometric lambda value can be requested on the basis of a performance specification for the internal combustion engine or a specification of the engine control, for example because the permissible exhaust gas temperature is exceeded.
- the transition phase is preferably subdivided into at least two phases, it being possible for the transition phase as a whole or only in at least one phase to be steered to the requested substoichiometric lambda value with different speeds or different steepness.
- Thrust shutdown phase initially at the beginning of the transition phase or in the first
- Phase of the transition phase a lambda value between 0.9 and 1.05, preferably between 0.93 and 1, 02 and particularly preferably between 0.97 and 1, 0 and then gradually or continuously controlled to the originally requested lambda value, wherein the step-by-step or continuous reduction in the transition phase can take place as a whole or only in at least one phase.
- the measure for controlling the lambda value in the transition phase or in at least one of the phases can preferably be made dependent on the exceeding of a temperature threshold for at least one of the catalysts.
- the transition phase or preferably at least one of the phases should preferably take place with a duration of at least ten work cycles, in particular at least thirty work cycles of the internal combustion engine.
- the change or the control of the lambda value in the transition phase or in at least one phase of the transition phase should preferably take place with an average enrichment rate of -0.01 to 0.3 s "1 , in particular of about -0.1 s ⁇ 1 .
- a particularly preferred embodiment of the method according to the invention is provided when using an oxygen-sensitive measuring device which is arranged after at least one catalyst.
- a lambda probe or a NO x sensor with a corresponding measuring function can be used as the oxygen-sensitive measuring device.
- the lambda in front of the at least one catalytic converter becomes a lambda value that is preferably ⁇ 1.00, optimally between 0.92 and 0.99, ideally between 0.94 and 0.96 is set.
- the actual lambda can be regulated to the target specification in a known manner via at least one oxygen-sensitive measuring device located downstream of the internal combustion engine, but upstream of an at least first catalytic converter.
- a lambda threshold value is undershot downstream of an at least first catalytic converter or downstream of the most critical catalyst on the oxygen-sensitive measuring device.
- This threshold value is close to 1.00, preferably in the range from 0.95 to 1.03, in particular between 0.97 to 1.01 and ideally between 0.98 and 0.9995.
- the lambda value can, as described, be reduced to the originally requested lambda value determined in a known manner.
- Both the lambda value at the beginning of the transition phase or at the beginning of the first phase and the enrichment speed are preferably dependent on the engine speed, a temperature of the at least one catalytic converter and / or a pre-catalytic converter, an exhaust gas temperature, an exhaust gas mass flow, the operating point and the oxygen storage capacity of at least one the catalysts of a time that has elapsed since the beginning of the transition phase and / or a lambda-related exhaust gas composition.
- the method variant described above with a staged restart of the fired operation of the internal combustion engine offers the additional advantage that the duration of the first stage can be adapted to the current catalytic converter state and thus the phase of the brief thermal overload is kept as short as possible and as long as necessary ,
- the lean-burn internal combustion engine with at least one catalytic converter arranged in an exhaust gas duct of the internal combustion engine has means with which immediately after an overrun cut-off phase of the internal combustion engine and / or immediately after an operating phase in which oxygen is stored in the catalytic converter, initially in one Transition phase an approximately stoichiometric or less sub-stoichiometric lambda can be set, and with which the lambda value can then be controlled with a predefinable course to a lambda value originally requested, preferably by an engine control, of the internal combustion engine.
- the at least one catalyst is at least one NO x storage catalyst, which can have at least one pre-catalyst.
- the means can have at least one oxygen-sensitive measuring device, which is arranged downstream of the at least one catalytic converter.
- a further oxygen-sensitive measuring device can be arranged downstream of the internal combustion engine, but upstream of an at least first catalytic converter.
- control unit which is preferably integrated in an engine control unit, in which models and algorithms for the coordinated control of exhaust and power-related measures are stored in digital form.
- control and coordination of the aforementioned means and other customary means takes place via the control unit or the engine control unit.
- the internal combustion engine according to the invention is a gasoline engine, in particular a direct injection gasoline engine, or a diesel engine.
- the at least one catalytic converter arranged in the exhaust gas duct of the internal combustion engine advantageously has a lower noble metal content than the prior art.
- the downstream catalyst system consisting of at least one NO x storage catalytic converter and possibly at least one upstream catalytic converter, advantageously has a noble metal content of 3,5 3.59 g / dm 3 (100 g / ft 3 ), in particular __ 2, 87 g / dm 3 (80 g / ft 3 ) and preferably ⁇ 2.15 g / dm 3 (60 g / ft 3 ).
- the catalyst system with a reduced noble metal content according to the invention with increasing vehicle mileage in the NEDC has no higher emissions than the original version with a higher noble metal content and without the method according to the invention. Further preferred embodiments of the invention result from the other features mentioned in the subclaims.
- Figure 1 is a schematic diagram of an internal combustion engine with a
- Thrust shutdown phase according to the inventive method
- FIG 3 shows time profiles of lambda before and after the catalytic converter when changing from a fuel cut-off phase according to a second variant of the method according to the invention.
- the internal combustion engine 10 shown in FIG. 1 is followed by an exhaust system 12.
- the exhaust system 12 has an exhaust duct 14, in which a pre-catalytic converter 16 arranged near the engine and a large-volume NO x storage catalytic converter 18 are located.
- the exhaust gas duct 14 usually has various gas and / or temperature sensors for regulating the internal combustion engine 10, but not shown here. 1 shows, by way of example, two oxygen-sensitive measuring devices 20, 22, upstream or downstream of the NO x storage catalytic converter 18, which supply a signal for the respective lambda value in the exhaust gas, and a temperature sensor 24, with the aid of which the temperature of the NO x Storage catalyst 18 is determined.
- the signals are transmitted to a control unit 26, in which they are used to control the operating modes of the internal combustion engine 10.
- the control unit 26 is also integrated in an engine control unit 28.
- the control unit 26 and the engine control unit 28 influence at least one operating parameter of the internal combustion engine 10, in particular an air-fuel mixture to be supplied (combustion lambda), as a function of the signals.
- graph 100a and 100b represent the lambda
- graph 102a and 102b the temperature of the NO x storage catalytic converter 18
- graph 104a and 104b the oxygen level of the NO x storage catalytic converter 18 in time
- the graphs 100a, 102a and 104a are shown in dashed lines and show the courses that result from the prior art, while the graphs 100b, 102b and 104b follow the courses represent the inventive method.
- the lambda value or the mixture composition is initially set stoichiometrically immediately after the fuel cut-off phase at time t 1.
- the lambda value originally requested by the engine controller 28 is only reached at a time t 2 , the course of the lowering of the lambda value being predetermined.
- the oxygen store of the NO x storage catalytic converter 18 is gradually emptied.
- the temperature at the NO x storage catalytic converter 18 rises between the two times t 1 and t 2 , but this rise is less than the temperature peak which arises in the method according to the prior art. This avoids excessive temperature stress and the associated damage to the NO x storage catalytic converter 18.
- FIG. 3 A variant of the method according to the invention is shown in FIG. 3.
- the graph 106 with the dashed line shows the lambda after the NO x storage catalytic converter 18 and the graph 108 shows the lambda upstream of the NO x storage catalytic converter 18.
- the lambda before NO x storage catalytic converter 18 becomes less substoichiometric Lambda value set as originally requested.
- the actual lambda is regulated to the lambda value in a known manner via at least one oxygen-sensitive measuring device 22 located downstream of the internal combustion engine 10, but upstream of the pre-catalytic converter 16.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Description
Claims
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10261913 | 2002-12-31 | ||
| DE10261913 | 2002-12-31 | ||
| DE10303663 | 2003-01-23 | ||
| DE10303663 | 2003-01-23 | ||
| DE10357415A DE10357415A1 (de) | 2002-12-31 | 2003-12-03 | Verfahren zur Steuerung einer Verbrennungskraftmaschine sowie magerlauffähige Verbrennungskraftmaschine |
| DE10357415 | 2003-12-03 | ||
| PCT/EP2003/014455 WO2004059136A1 (de) | 2002-12-31 | 2003-12-18 | Verfahren zur steuerung einer verbrennungskraftmaschine sowie magerlauffähige verbrennungskraftmaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1581729A1 true EP1581729A1 (de) | 2005-10-05 |
| EP1581729B1 EP1581729B1 (de) | 2008-05-28 |
Family
ID=32685660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03795912A Expired - Lifetime EP1581729B1 (de) | 2002-12-31 | 2003-12-18 | Verfahren zur steuerung einer verbrennungskraftmaschine sowie magerlauffahige verbrennungskraftmaschine |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1581729B1 (de) |
| AT (1) | ATE397147T1 (de) |
| DE (1) | DE50309932D1 (de) |
| WO (1) | WO2004059136A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8168616B1 (en) | 2000-11-17 | 2012-05-01 | Novartis Ag | Combination comprising a renin inhibitor and an angiotensin receptor inhibitor for hypertension |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3591283B2 (ja) * | 1998-01-29 | 2004-11-17 | 日産自動車株式会社 | エンジンの排気浄化装置 |
| JP3259711B2 (ja) * | 1999-05-18 | 2002-02-25 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
| JP2001082135A (ja) * | 1999-09-09 | 2001-03-27 | Toyota Motor Corp | 内燃機関の排気浄化装置 |
| JP3607984B2 (ja) * | 2000-06-26 | 2005-01-05 | トヨタ自動車株式会社 | 車載用内燃機関の排気浄化装置 |
| JP4666542B2 (ja) * | 2000-06-29 | 2011-04-06 | 株式会社デンソー | 内燃機関の排気浄化制御装置 |
| DE10064665C2 (de) * | 2000-12-22 | 2003-04-30 | Siemens Ag | Verfahren zum Steuern einer Brennkraftmaschine |
-
2003
- 2003-12-18 AT AT03795912T patent/ATE397147T1/de not_active IP Right Cessation
- 2003-12-18 EP EP03795912A patent/EP1581729B1/de not_active Expired - Lifetime
- 2003-12-18 DE DE50309932T patent/DE50309932D1/de not_active Expired - Lifetime
- 2003-12-18 WO PCT/EP2003/014455 patent/WO2004059136A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2004059136A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE397147T1 (de) | 2008-06-15 |
| EP1581729B1 (de) | 2008-05-28 |
| DE50309932D1 (de) | 2008-07-10 |
| WO2004059136A1 (de) | 2004-07-15 |
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