EP1563178A1 - Method for operating an internal combustion engine of a vehicle, in particular a motor vehicle - Google Patents
Method for operating an internal combustion engine of a vehicle, in particular a motor vehicleInfo
- Publication number
- EP1563178A1 EP1563178A1 EP03775271A EP03775271A EP1563178A1 EP 1563178 A1 EP1563178 A1 EP 1563178A1 EP 03775271 A EP03775271 A EP 03775271A EP 03775271 A EP03775271 A EP 03775271A EP 1563178 A1 EP1563178 A1 EP 1563178A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nitrogen oxide
- lean
- catalytic converter
- operating
- evaluation period
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
- F01N3/0842—Nitrogen oxides
-
- 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
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/3011—Controlling fuel injection according to or using specific or several modes of combustion
- F02D41/3076—Controlling fuel injection according to or using specific or several modes of combustion with special conditions for selecting a mode of combustion, e.g. for starting, for diagnosing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
-
- 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
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0625—Fuel consumption, e.g. measured in fuel liters per 100 kms or miles per gallon
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/3011—Controlling fuel injection according to or using specific or several modes of combustion
- F02D41/3017—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used
- F02D41/3023—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used a mode being the stratified charge spark-ignited mode
- F02D41/3029—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used a mode being the stratified charge spark-ignited mode further comprising a homogeneous charge spark-ignited mode
Definitions
- the invention relates to a method for operating an internal combustion engine of a vehicle, in particular a motor vehicle, according to the preamble of claim 1.
- Otto engines are preferred as internal combustion engines with direct petrol injection instead of conventional intake manifold injection, since such internal combustion engines have significantly more dynamics than conventional Otto engines, are better in terms of torque and power, and at the same time reduce consumption by up to Enable 15%. This is made possible above all by a so-called stratified charge in the part-load range, in which an ignitable mixture is only required in the area of the spark plug, while the rest of the combustion chamber is filled with air.
- the particularly finely atomized fuel is optimally concentrated and safely ignited in a so-called “mixture bale" around the spark plug.
- the engine control or the engine control unit ensures the optimal adjustment of the injection parameters (injection timing, fuel pressure) ,
- Such internal combustion engines can therefore be operated in lean operation for a correspondingly long time, which, as has already been explained above, has a positive effect on overall fuel consumption.
- this lean operation has the disadvantage of a considerably larger amount of nitrogen oxide in the exhaust gas, so that the nitrogen oxides (NOx) in the lean exhaust gas can no longer be completely reduced with a three-way catalytic converter.
- nitrogen oxide storage catalytic converters are additionally used in connection with such internal combustion engines. These nitrogen oxide storage catalysts are operated in such a way that the large amounts of nitrogen oxides generated by the internal combustion engine are stored therein.
- the engine control or the engine control unit briefly switches to sub-stoichiometric, rich engine operation, in which the internal combustion engine is operated with a rich, air-deficient mixture.
- an oxygen store of the nitrogen oxide storage catalytic converter is regularly emptied, as a result of which the oxygen required for the process of being withdrawn is made available.
- the nitrogen oxide stored is numerous, in particular due to the rich operating conditions under these conditions existing hydrocarbons (HC) and carbon monoxides (CO) reduced to nitrogen (N 2 ), which can then be released into the environment.
- HC hydrocarbons
- CO carbon monoxides
- N 2 nitrogen
- the lean operating area here is e.g. B. a stratified in connection with a dynamic driving style, as z. B. is the case in city traffic, the engine control unit due to the lean operating range in which the lambda value is approximately 1.4.
- the lambda value is approximately 1.4.
- the engine control comprises a computer which, depending on predetermined switchover criteria, effects a switchover to rich or lean operation of the diesel engine. Furthermore, a sensor system communicating with the computer, which monitors parameters necessary for switchover criteria, and a memory communicating with the computer are provided, in which the characteristic maps for the operation of the diesel engine are stored. The computer switches over from lean to rich operation when the maintenance criteria of a regeneration temperature of a storage catalyst element through which the exhaust gases of the diesel engine flow and the presence of a predetermined loading state of the storage catalyst element through which the exhaust gases of the diesel engine are satisfied are met as switching criteria.
- the computer switches back from rich to lean operation if one of the switchover criteria for switching from lean to rich operation does not exist or a regeneration time has expired which is dependent on the respective loading state of the storage catalyst element through which the exhaust gases of the diesel engine flow at the beginning of the rich operation phase depends, or a predetermined reducing agent content is present in the exhaust gases after the storage catalyst element or an exhaust gas temperature is below a predetermined threshold value.
- the object of the invention is therefore to provide an alternative method for operating an internal combustion engine of a vehicle, in particular a motor vehicle, with which an operation of the internal combustion engine which is optimized with regard to fuel consumption, in particular through optimized lean operation, is possible in a simple manner.
- the engine control unit blocks the switchover to the lean operating range if the additional fuel consumption quantity for the discharges in a specific predefinable evaluation period, which extends over several lean operating phases, is equal to or greater than the reduced fuel consumption quantity due to lean operating operation in this evaluation period.
- the engine control unit also gives a lean operation and thus switches between the lean operation area and the homogeneous one
- the fuel shortage quantity is calculated as a function of a nitrogen oxide raw mass flow value averaged over the evaluation period, as a function of a fuel saving quantity averaged over the evaluation period in the lean operating phases falling into the evaluation period compared to the homogeneous operating range phases and as a function of a time between the two averaged over the evaluation period Torque requirements exceeding predefinable load and / or speed limit values and leaving the lean operating range are determined.
- the additional fuel consumption quantity is also determined as a function of a storage catalytic converter loading state averaged over the evaluation period.
- the driver's driving behavior can advantageously be “learned” and thus a prediction can be made regarding the likely future driving behavior. That is, in this operating mode, the driving behavior in the past is evaluated over a meaningful evaluation period and on the basis of this Evaluation of the prediction for the future, ie for the probable one
- Lean operating time can be calculated.
- the lean operating range may not be released here if the view is based on the evaluation period on average, even if this would result from a purely stationary view at a certain point in time, as a result of the view and based on a meaningful time window here, according to the invention, the FahiN obtained is taken into account as a whole and not a current stationary operating point.
- a particularly optimized mode of operation is possible, in particular with regard to fuel savings through lean operation.
- the evaluation period is particularly advantageously at least about 100 seconds.
- the amount of fuel used due to the rich operating phases is calculated in the evaluation period as the sum of a first amount of fuel required for discharging the oxygen store and a second amount of fuel required for discharging the nitrogen oxide store.
- the first amount of fuel i.e. the amount of fuel for discharging the oxygen reservoir
- the second amount of fuel is mainly a function of the raw nitrogen oxide emissions during the lean period, so that the second amount of fuel is averaged over the evaluation period, which means that the fuel -More consumption amount as a function of the storage catalyst loading state averaged over the evaluation period can be determined in a simple manner.
- the nitrogen oxide loading of the nitrogen oxide storage catalytic converter is mainly a function of the lean period and possibly also of the raw nitrogen oxide mass flow. For example, for the regeneration of 1 g of oxygen A fuel quantity of approx. 0.23 g is required, while the regeneration of 1 g of nitrogen dioxide requires approx. 0.15 g of fuel.
- a first lean time is calculated from the quotient of a current nitrogen oxide storage capacity of the nitrogen oxide storage catalytic converter and the averaged nitrogen oxide raw mass flow value.
- the mean time between two torque requirements exceeding a predefinable load and / or speed limit and leaving the lean operating range as a second lean time is compared with the first lean time, the minimum or the smaller of the two lean times being then multiplied by the average fuel saving quantity in the evaluation period ,
- the fuel consumption quantity in the evaluation period can be determined in a particularly simple manner.
- the current nitrogen oxide storage capacity of the nitrogen oxide storage catalyst can be determined as a function of the temperature and / or the degree of aging and / or the sulfurization.
- the nitrogen oxide mass flow upstream of the nitrogen oxide storage catalytic converter and / or the nitrogen oxide mass flow downstream of the nitrogen oxide storage catalytic converter are each integrated over an identical period of time, with the determination of the switchover time from the storage phase to the discharge phase and thus from the lean operating range to the rich operating range at least from the integral value of the Nitrogen oxide mass flow before and / or after the storage catalytic converter and / or the changeover time, in each case when a predeterminable discharge changeover condition is met in a first stage to determine the degree of aging of the storage catalytic converter, a changeover operating point as a function of a current operating temperature at the changeover time is determined.
- the respective switchover operating point is then carried out in a second stage to determine the degree of aging of the storage catalytic converter with a predefinable storage catalytic converter capacity field that runs over a temperature window and is optimized in particular with regard to fuel consumption, which is provided by a large number of individual operating points for a new and an aged one Storage catalyst is formed compared.
- a changeover operating point lying within the storage catalyst capacity field does not represent a drop below the minimum nitrogen oxide storage capacity, but rather the change compared to the previous operating point as a measure of the storage catalyst aging.
- a switchover operating point leaving the storage catalyst capacity field is below the minimum nitrogen oxide storage capacity.
- a relative nitrogen oxide slip as the difference between the nitrogen oxide mass flow flowing into the nitrogen oxide storage catalytic converter and the nitrogen oxide stream flowing out of the nitrogen oxide storage catalytic converter is used to determine the switchover time from the storage phase to the discharge phase.
- Mass flow is determined in each case based on the injection time in such a way that the quotient of the integral values of the nitrogen oxide mass flow before and after the nitrogen oxide storage catalytic converter also has a relative relationship with a predetermined
- the degree of nitrogen oxide conversion, derived from an exhaust gas limit value, is brought about, so that when this predeterminable switchover condition is met, the switchover from the store-in phase to the discharge phase is carried out at the switch-over time optimized with regard to fuel consumption and store-in potential.
- the storage catalytic converter capacity field with respect to the temperature window is limited on the one hand by a boundary line for a new storage catalytic converter and on the other hand by a border line for an aged storage catalytic converter which represents a state of limit aging.
- the temperature window preferably comprises temperature values between approximately 200 ° C. and approximately 450 ° C.
- Fig. 1 is a schematic diagram of the fuel saving amount in lean operation over time
- Fig. 2 is a schematic diagram of the liabilities of the additional fuel consumption over time.
- This averaged time is based on the evaluation period, that is to say that different exceeding torque requests are compared in terms of their time span and the averaged time value is thus made available.
- This averaged time between two torque requirements exceeding a predefined load and / or speed limit value and leaving the lean operating range represents a so-called second lean time.
- the first lean time is the quotient of a current nitrogen oxide storage capacity of the nitrogen oxide storage catalytic converter and the average nitrogen oxide raw mass flow value determined.
- the current nitrogen oxide storage capacity of the nitrogen oxide storage catalyst is determined as a function of the temperature and / or the degree of aging and / or the sulfurization.
- the averaged nitrogen oxide raw mass flow value is also determined by the engine control unit for the evaluation period.
- This first lean time is then compared with the second lean time, the smaller of the two lean times, ie the minimum of these two lean times, being taken in order to be multiplied by the average fuel saving quantity in the evaluation period.
- the sum of the fat phases following the lean phase of the first fuel quantity required for discharging the oxygen store of the nitrogen oxide storage catalytic converter and a second fuel quantity required for discharging the nitrogen oxide store of the nitrogen oxide storage catalytic converter is formed.
- This relationship is shown in FIG. 2. From this Fig. 2 it can be seen that the amount of fuel for discharging the oxygen storage is approximately constant (curve 5), while the second amount of fuel for discharging the nitrogen oxide storage (curve 4) is a function of the lean time, since the oxygen storage is already almost fully loaded immediately after the start of a lean operating phase, while the Nitrogen oxides are more inert and therefore need a longer time to be deposited.
- Curve 6 is the sum of the fuel quantities in curves 4 and 5. If the averaging over time, ie over an evaluation period, results in a time-related nitrogen oxide storage catalyst loading with nitrogen oxides, so that the lean time is taken into account according to the following formula the additional fuel consumption can be calculated:
- Additional fuel consumption quantity (g) oxygen storage quantity (g) x first percentage fuel quantity + time-based averaged NO x - storage quantity (g / s) x lean time (s) x second percentage fuel quantity
- the lean time provided here results from the sum of the individual lean operating times in the evaluation period.
- a comparison of the reduced fuel consumption amount with the increased fuel consumption amount based on the evaluation period ie a comparison of curve 2 in FIG. 1 and curve 6 in FIG. 2 thus enables an operating mode such that the engine control unit switches over to blocks the lean operating range if the fuel consumption quantity for the discharges in the considered evaluation period, which is preferably approximately 100 seconds, is equal to or greater than the reduced fuel consumption quantity due to the lean operation in this evaluation period.
- the amount of fuel consumption for the discharges is less than If the amount of fuel consumption reduced by lean operation in this evaluation period, the engine control unit enables lean operation and thus a switchover between the lean operating area and the homogeneous operating area.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10253614 | 2002-11-15 | ||
DE10253614A DE10253614B4 (en) | 2002-11-15 | 2002-11-15 | Method for operating an internal combustion engine of a vehicle, in particular of a motor vehicle |
PCT/EP2003/012112 WO2004046529A1 (en) | 2002-11-15 | 2003-10-31 | Method for operating an internal combustion engine of a vehicle, in particular a motor vehicle |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1563178A1 true EP1563178A1 (en) | 2005-08-17 |
EP1563178B1 EP1563178B1 (en) | 2010-09-08 |
Family
ID=32240117
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03775271A Expired - Fee Related EP1563178B1 (en) | 2002-11-15 | 2003-10-31 | Method for operating an internal combustion engine of a vehicle, in particular a motor vehicle |
Country Status (5)
Country | Link |
---|---|
US (1) | US7100363B2 (en) |
EP (1) | EP1563178B1 (en) |
AU (1) | AU2003283332A1 (en) |
DE (2) | DE10253614B4 (en) |
WO (1) | WO2004046529A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004017092B4 (en) * | 2004-04-07 | 2008-10-16 | Audi Ag | Method for optimizing the operation of an Otto internal combustion engine of a motor vehicle |
FR2901317B1 (en) * | 2006-05-16 | 2008-08-29 | Peugeot Citroen Automobiles Sa | SYSTEM FOR CONTROLLING THE TRIGGERING OF A DELEGATION MEANS PURGING COMPRISING MEANS FORMING A NOX TRAP |
WO2016074879A1 (en) * | 2014-11-10 | 2016-05-19 | Fev Gmbh | Method for operating an internal combustion engine comprising a lean nox trap |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2692530B2 (en) | 1992-09-02 | 1997-12-17 | トヨタ自動車株式会社 | Internal combustion engine |
JP2900890B2 (en) * | 1996-08-09 | 1999-06-02 | トヨタ自動車株式会社 | Catalyst deterioration determination device for internal combustion engine |
DE19753718C1 (en) * | 1997-12-04 | 1999-07-08 | Daimler Chrysler Ag | Method for operating a diesel engine |
JP3858554B2 (en) * | 2000-02-23 | 2006-12-13 | 株式会社日立製作所 | Engine exhaust purification system |
US6843051B1 (en) | 2000-03-17 | 2005-01-18 | Ford Global Technologies, Llc | Method and apparatus for controlling lean-burn engine to purge trap of stored NOx |
JP3958496B2 (en) * | 2000-05-10 | 2007-08-15 | 三菱電機株式会社 | Exhaust gas purification device for internal combustion engine |
JP4023115B2 (en) * | 2001-07-17 | 2007-12-19 | 日産自動車株式会社 | Control device for direct-injection spark ignition engine |
US6778898B1 (en) * | 2003-02-14 | 2004-08-17 | Ford Global Technologies, Llc | Computer controller for vehicle and engine system with carbon canister vapor storage |
US6826902B2 (en) * | 2003-03-18 | 2004-12-07 | Ford Global Technologies, Llc | Method and apparatus for estimating oxygen storage capacity and stored NOx in a lean NOx trap (LNT) |
-
2002
- 2002-11-15 DE DE10253614A patent/DE10253614B4/en not_active Withdrawn - After Issue
-
2003
- 2003-10-31 EP EP03775271A patent/EP1563178B1/en not_active Expired - Fee Related
- 2003-10-31 US US10/534,980 patent/US7100363B2/en not_active Expired - Fee Related
- 2003-10-31 DE DE50313079T patent/DE50313079D1/en not_active Expired - Lifetime
- 2003-10-31 WO PCT/EP2003/012112 patent/WO2004046529A1/en not_active Application Discontinuation
- 2003-10-31 AU AU2003283332A patent/AU2003283332A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2004046529A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE10253614B4 (en) | 2008-12-24 |
AU2003283332A1 (en) | 2004-06-15 |
EP1563178B1 (en) | 2010-09-08 |
US7100363B2 (en) | 2006-09-05 |
DE10253614A1 (en) | 2004-06-03 |
WO2004046529A1 (en) | 2004-06-03 |
US20060162319A1 (en) | 2006-07-27 |
DE50313079D1 (en) | 2010-10-21 |
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