AT521750A1 - Method and gasoline engine arrangement with an improved NSC system - Google Patents

Abstract

The invention relates to a method and a gasoline engine arrangement, the gasoline engine arrangement comprising a gasoline engine and an exhaust gas aftertreatment system (2), the exhaust gas aftertreatment system (2) comprising a main catalytic converter (3) and a NOx storage catalytic converter (10) downstream of the main catalytic converter (3), wherein in a normal operating phase in the gasoline engine, fuel and air are converted to an exhaust gas, with the NOx storage catalytic converter (10) being supplied to the NOx storage catalytic converter (10) via a supply line (14) opening into the exhaust gas aftertreatment system (2), with the Oxygen content of the exhaust gas flowing through the main catalyst (3) or of the exhaust gas located in the main catalyst (3) in the storage mode is less than 5 vol.% Or essentially zero, and / or the oxygen quantity of the exhaust gas flowing through the main catalyst (3) in the storage mode the amount of oxygen of the A in the main catalyst (3) b gas is kept so low that the efficiency of the main catalyst (3) is unaffected.

Description

Method and gasoline engine arrangement with an improved NSC system

The invention relates to a method and a gasoline engine arrangement according to the preambles of the independent claims.

Different methods for operating an internal combustion engine are known from the prior art.

For example, methods are known in which the nitrogen oxides emitted by a diesel engine, in particular in the form of nitrogen dioxide NO2, are stored at least temporarily in a NOx storage catalytic converter, a so-called NSC. Such NOx storage catalysts can include, for example, heavy alkali metals (e.g. potassium, sodium), heavy alkaline earth metals (e.g. barium, calcium) or light rare earths (e.g. lanthanum, cerium) in the form of the oxide or carbonate.

These storage materials make it possible to store the nitrogen oxides contained in the exhaust gas at least temporarily in the NOx storage catalytic converter. In order to enable the storage of nitrogen oxides, in particular in the form of nitrogen dioxide NO2, an excess of oxygen in the exhaust gas is required, which is ensured with a conventional diesel arrangement. In order to release and reduce the stored nitrogen dioxide again, the engine must be operated in a stoichiometric manner according to the state of the art in phases.

Methods for operating a diesel engine are also known in which an oxidation catalyst coated with an oxidation catalyst coating is provided, the oxidation catalyst coating being set up to convert nitrogen monoxide NO with oxygen O2 to nitrogen dioxide NO2. As a result, NO2 is generated in or on the oxidation catalyst coating as soon as it is supplied with NO and O2.

Furthermore, methods for operating a diesel or gasoline engine are known in which the particle-laden exhaust gas penetrates a porous filter wall

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Exhaust filter is filtered. During the filtration process, particles are retained by the filter medium of the exhaust gas filter and are deposited on it.

The filter walls of the exhaust gas filter can consist of different porous materials and can be constructed, for example, of fibers or powder. The fibers or the powder itself consist in particular of ceramics or of metals. Classic ceramics are mullite, cordierite, silicon carbide (SiC) and aluminum titanate.

In general, by depositing the particles on the surface or inside the filter wall, a particle layer that influences the filtration can form - a so-called filter cake in the case of formation on the surface, which on the one hand leads to the best possible already load-free Filtration efficiency is further improved, on the other hand the flow resistance and thus the differential pressure at the exhaust gas filter generated by the exhaust gas volume flow increases.

Also in the gasoline engine assembly, as already known from conventional diesel assemblies, regeneration of the exhaust gas filter with a correspondingly high soot load is necessary in order to be able to reduce or prevent excessive counterpressure or undesired temperature peaks in the particulate filter in the event of the soot burning up. Since a gasoline engine arrangement has a significantly lower particle emissions level in combination with a significantly higher exhaust gas temperature level in comparison to a diesel arrangement, regeneration is less necessary in the gasoline engine arrangement.

The active initiation of regeneration of the gasoline engine particulate filter is also necessary in the gasoline engine arrangement at the latest when the particle loading causes the exhaust gas backpressure to exceed an exhaust gas backpressure threshold value at which the exhaust gas emission is severely hampered and, in particular, potentially sustainable damage-related component limit values of the engine or the exhaust gas aftertreatment system are exceeded.

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In conventional gasoline engine arrangements, on the one hand, the exhaust gas temperature is higher than in conventional diesel arrangements, which makes thermal oxidative regeneration in the presence of oxygen easier. On the other hand, compared to conventional diesel arrangements in conventional gasoline engine arrangements, the stoichiometric normal operation results in less oxygen, as a result of which significantly less oxygen is available for regeneration of the gasoline engine particle filter.

The object of the invention is to overcome the disadvantages of the prior art. In particular, it is an object of the invention to provide a method for operating a gasoline engine arrangement in order to further reduce or reduce the already low nitrogen oxide level after the at least one main catalytic converter, in particular the 3-way catalytic converter, as much as possible, in particular in the direction of ambient air limit values reduce. It is therefore the task of the invention to come closer to the so-called vision of “zero impact emission”, in order to provide the end customer with a gasoline engine arrangement that is economical in terms of fuel consumption and to protect the environment as much as possible by falling below the pollutant emission laws prescribed by law.

The object of the invention is achieved in particular by the features of the independent claims.

The invention relates to a method for operating a gasoline engine arrangement, the gasoline engine arrangement comprising a gasoline engine and an exhaust gas aftertreatment system, the exhaust gas aftertreatment system comprising at least one main catalytic converter and one NOx storage catalytic converter arranged downstream of the main catalytic converter, fuel and air being converted into exhaust gas in a normal operating phase in the gasoline engine .

According to the invention, it is provided that in the storage mode of the NOx storage catalytic converter, the NOx storage catalytic converter is supplied with oxygen via a supply line opening into the exhaust gas aftertreatment system

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The gasoline engine arrangement can be the gasoline engine arrangement of an internal combustion engine, in particular the gasoline engine arrangement of a motor vehicle.

If necessary, the NSC catalytic converter is positioned at a position in the exhaust gas aftertreatment system in which the exhaust gas temperature when entering the NSC catalytic converter is lower than when it exits the gasoline engine.

The gasoline engine arrangement comprises a gasoline engine and an exhaust gas aftertreatment system.

Furthermore, the exhaust gas aftertreatment system may include the main catalytic converter (s) and the NOx storage catalytic converter and optionally one or more pre-catalytic converter (s) and / or one or more secondary catalytic converter (s), in particular one or more oxidation catalytic converter (s) which comprises an oxidation catalytic converter coating. and / or one or more heating catalytic converter (s) and / or one or more, in particular gaseous exhaust gas aftertreatment-coated, gasoline engine particle filters and / or one or more NOx storage catalytic converter (s) and / or one or more exhaust gas aftertreatment component (s) which are a NOx storage catalytic converter -Coating include, and / or one or more SCR5 / 55

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System (s) and / or one or more exhaust gas aftertreatment component (s) which comprise an SCR coating and / or comprise a secondary air injection.

It can also be provided that a further catalyst or a secondary catalyst is arranged instead of the oxidation catalyst.

If one or more SCR system (s) and / or one or more exhaust gas aftertreatment component (s) which comprise an SCR coating are provided, it is advantageous if an operating fluid, in particular what is known as AdBlue®, is provided by a metering device upstream of the SCR catalytic converter , in particular after the oxidation catalyst, is introduced into the exhaust gas aftertreatment system. The operating fluid advantageously contains a reducing agent for nitrogen oxide reduction or can be converted into a reducing agent for nitrogen oxide reduction.

Furthermore, the exhaust gas aftertreatment system can consist of the main catalytic converter (s) and the NOx storage catalytic converter and optionally one or more pre-catalytic converter (s) and / or one or more secondary catalytic converter (s), in particular one or more oxidation catalytic converter (s), which comprises an oxidation catalytic converter coating , and / or one or more heating catalytic converter (s) and / or one or more gasoline particulate filter / η and / or one or more NOx storage catalytic converter (s) and / or one or more exhaust gas aftertreatment component (s), which comprises a NOx storage catalytic converter coating, in particular gaseous exhaust gas aftertreatment / s, and / or one or more SCR system / s and / or one or more exhaust gas aftertreatment component / s, which comprises an SCR coating / s, and / or a secondary air injection.

It is optionally provided that the supply line is designed such that the exhaust gas aftertreatment system is flowed through unidirectionally in the direction of the exhaust gas aftertreatment system. In particular, it can be provided that the supply line comprises a safety device which prevents the exhaust gas from flowing out into the environment or into other exhaust gas components.

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The main catalytic converter is optionally arranged in front of the oxidation catalytic converter which may be provided, and the oxidation catalytic converter which is optionally provided in front of the NOx storage catalytic converter.

In particular, the exhaust gas generated in the gasoline engine flows through the main catalytic converter, optionally through the oxidation catalytic converter and the NOx storage catalytic converter of the exhaust gas aftertreatment system.

In the normal operating phase, which essentially corresponds to the regular operating mode of the gasoline engine arrangement or the gasoline engine, fuel and air are introduced into the combustion chamber of at least one cylinder of the gasoline engine and converted to exhaust gas by combustion.

In the normal operating phase, the gasoline engine can preferably be operated and / or regulated in a lambda window by λ = 1. This means that the gasoline engine is optionally operated in a manner oscillating around a lambda value λ of 1.0 and in particular is operated and / or regulated with a lambda value λ in the range from 0.9 to 1.1, preferably from 0.95 to 1.05 becomes. It can be provided that the gasoline engine is operated and / or regulated in phases or permanently under or over stoichiometric or rich or lean in its normal operating phase, provided that the exhaust gas aftertreatment components of the gasoline engine arrangement allow a sufficiently high, in particular the best possible, raw emission conversion under these conditions.

This means, if necessary, that a sufficient, preferably the greatest possible degree of conversion of the pollutants by the exhaust gas aftertreatment components should be ensured in total, both in the normal operating phase and in storage operation. This enables a sufficiently high reduction in pollutants in both operating phases. In particular, it is provided that the time the level of pollutant emissions conversion of the exhaust gas aftertreatment system does not fall below a threshold level of pollutant emissions conversion below which there is no longer a sufficiently high reduction in pollutant emissions. If necessary, it is provided that the

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Pollutant emission conversion degree threshold is as large as possible, especially in a range as close as possible to 100%.

In particular, it is provided that the exhaust gas generated by the gasoline engine is essentially oxygen-free in the normal operating phase and at most contains only small amounts of oxygen.

Provision can be made to operate the gasoline engine in the storage mode of the NOx storage catalytic converter as in the normal operating phase.

In the storage mode of the NOx storage catalytic converter, oxygen and in particular air, preferably filtered and / or compressed ambient air, is supplied to the NOx storage catalytic converter via a supply line. The feed line preferably opens into the exhaust gas aftertreatment system upstream of the NOx storage catalytic converter and optionally upstream of the oxidation catalytic converter.

By supplying oxygen, in particular air, the NOx storage catalytic converter can at least temporarily store the nitrogen oxides emitted by the gasoline engine, in particular in the form of nitrogen dioxide NO2, and, if necessary, convert the stored nitrogen oxides to nitrogen N2 if the NOx storage catalytic converter or the NOx Exhaust gas flowing storage catalyst has a temperature which is greater than a storage temperature, in particular greater than 100 ° C, preferably greater than 180 ° C. It is stated here that with the different NOx storage catalyst coating technologies, a different “light off” storage temperature required for storage must be achieved. Subsequently, the storage temperature should exceed a maximum value as little as possible in order not to fall out of a so-called storage window.

If, for example, barium Ba is used as the storage material, the nitrogen oxides emitted by the gasoline engine are essentially stored in the form of nitrogen dioxide as follows:

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BaCO ₃ + 2 N0 ₂ + ~ 0 ₂ -> Bci (N03) ₂ + C0 ₂

It may also be possible that the stored nitrogen dioxide is released again by the addition of carbon monoxide CO and hydrocarbons HC and the resulting decomposition of the nitrate. If, for example, barium Ba is used as the storage material, this process is essentially carried out according to the following rule:

Ba (NO ₃ ) ₂ + CO - * BaCO ₃ + 2 NO + O ₂

The resulting nitrogen monoxide NO can be reduced to nitrogen N2 by a reducing agent such as hydrocarbon HC, hydrogen H2 or carbon monoxide CO on a noble metal component of the NOx storage catalyst, in particular on rhodium Rh. This reduction essentially follows the following rule:

HC + 2 NO + O ₂ + -H ₂ + CO - + H ₂ 0 + 2 CO ₂ + N ₂

It is preferably provided that a catalyst coated with an oxidation catalyst coating is provided in the front area of the NOx storage catalyst or in front of the NOx storage catalyst. This oxidation catalyst coating can be set up to convert NO with O2 to NO2. This implementation essentially follows the following rule:

NO + O ₂ 2 NO ₂

Furthermore, this oxidation catalyst coating can be set up to convert any NH3 that may be formed with O2 to NOx as a by-product and intermediate product of catalytic reactions in the catalysts in the presence of CO. This implementation essentially follows the following rule:

4NH ₃ + (3 + 2x) 0 ₂ 4NO _X + 6H ₂ O where x = {1,2}

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In particular, the oxidation catalyst with oxygen can minimize or reduce any NH3 formed. The resulting reaction products, in particular the nitrogen oxides, can then be fed to a, preferably best, effective NOx aftertreatment, such as a NOx storage catalytic converter.

This makes it possible to oxidize by-products and intermediates from catalytic reactions, for example NH3 formed, in the catalysts, in particular in the oxidation catalytic converter, and to feed the reaction products formed in this oxidation in the oxidation catalytic converter, in particular the nitrogen oxides, to the best possible NOx aftertreatment. In particular, it is possible that NH3 is formed in the main catalytic converter, in particular in the 3-way catalytic converter, if CO or H2 is present in the exhaust gas.

The oxidation catalyst coating preferably comprises a platinum metal, such as in particular platinum, rhodium and / or palladium, or is formed from a platinum metal, such as in particular from platinum, from rhodium and / or from palladium.

It is preferably provided that in the storage mode of the NOx storage catalytic converter, oxygen and in particular air are also supplied to the oxidation catalytic converter coating. As a result, the nitrogen monoxide contained in the exhaust gas can be converted into oxygen in a first step and the nitrogen dioxide thus generated can be stored in the NOx storage catalytic converter in a second step.

In contrast to conventional methods, it is not necessary to operate the gasoline engine periodically lean or rich, since oxygen and, in particular, air are supplied to the NOx storage catalytic converter via the supply line. Even in contrast to the method described in the prior art, it may be possible to operate and / or regulate the gasoline engine, in particular always, in a lambda window by λ = 1. As a result, it may be possible for the 3-way catalytic converter and the other exhaust gas aftertreatment components which act as 3-way catalytic converters to always be supplied with an essentially oxygen-free or low-oxygen exhaust gas.

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During the storage operation of the NOx storage catalytic converter, the oxygen content of the exhaust gas flowing through the main catalytic converter or of the exhaust gas located in the main catalytic converter can be less than 5% by volume or essentially zero.

During the storage operation of the NOx storage catalytic converter, the amount of oxygen in the exhaust gas flowing through the main catalytic converter or the amount of oxygen in the exhaust gas located in the main catalytic converter can therefore be kept so low that the efficiency of the main catalytic converter is unaffected, so that at any time a sufficiently high, preferably maximum, pollutant emission conversion rate Exhaust aftertreatment components in total is ensured.

In particular, the main catalytic converter, the main catalytic converters or the main catalytic converter (s) and the further exhaust gas aftertreatment components have a high, preferably the best possible, efficiency in normal operation as well as in storage mode before the feed line flows into the exhaust gas aftertreatment system.

This may make it possible to store the nitrogen oxides emitted by the gasoline engine in the form of NO2 in the NOx storage catalytic converter without having to flood the exhaust gas aftertreatment system, in particular the main catalytic converter, with oxygen.

In particular, the efficiency of the main catalytic converter, in particular the 3-way catalytic converter, can be unaffected by the storage operation of the NOx catalytic converter, that is to say by the storage of the nitrogen oxides. This means that the efficiency of the main catalytic converter, in particular the 3-way catalytic converter, may not be reduced by the storage mode.

It is preferably provided that only the NOx storage catalytic converter and possibly the oxidation catalytic converter are / are flowed through with oxygen-containing gas, in particular air, in the storage mode.

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In the context of the present invention, the at least one main catalytic converter or the main catalytic converter means one or more catalytic converter (s), in particular several main catalytic converters, which have essentially the same effect and / or function. If appropriate, the at least one main catalytic converter comprises one or more catalytic converter (s), in particular one or more pre-catalytic converter or secondary catalytic converter (s) and / or one or more heating catalytic converter (s). If appropriate, the at least one main catalytic converter is formed from one or more main catalytic converter (s), in particular from one or more primary and / or secondary catalytic converter (s) and / or from one or more heating catalytic converter (s). At least one of the abovementioned catalysts is preferably coated with a 3-way coating.

It is optionally provided that the method is carried out automatically, in particular in a control unit of a motor vehicle and / or controlled and / or regulated by a control unit of a motor vehicle.

Storage operation may be interrupted after the maximum possible storage of NO2 in the NOx storage catalytic converter.

If necessary, it is provided that in the normal operating phase the exhaust gas from the gasoline engine is fed to the main catalytic converter, possibly the oxidation catalytic converter and the NOx storage catalytic converter, that the main catalytic converter is designed or acts as a 3-way catalytic converter and that the gasoline engine in its normal operating phase is preferably in a lambda window by λ = 1 operated or regulated.

It is optionally provided that in storage operation upstream or in the NOx storage catalytic converter, in particular on the oxidation catalytic converter coating, NO is converted to NO2 with the oxygen supplied through the, in particular unidirectional, feed line and that the NO2 formed is at least partially in the NOx storage catalytic converter at least temporarily is saved.

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In a preferred embodiment, NO is converted to NO2 in the storage mode upstream or in the NOx storage catalytic converter with the oxygen supplied through the unidirectional supply line.

If appropriate, it is provided that the oxygen volume flow or air volume flow supplied to the NOx storage catalytic converter, in particular unidirectionally supplied, through the supply line is controlled or regulated, in particular via a supply valve.

Furthermore, a device regulating or preventing the introduction of air, in particular a supply valve, can be provided, with which the supply of oxygen, in particular the supply of air, can be controlled and / or regulated by the supply line.

According to a preferred embodiment, the feed line into the exhaust gas aftertreatment system can optionally include a safety device, such as a check valve or a switchable valve, which is closed in particular when de-energized, so that the outflow of the exhaust gas into the environment is prevented in any case.

If appropriate, it is provided that the exhaust gas aftertreatment system contains the main catalytic converter (s) and the NOx storage catalytic converter and optionally one or more pre-catalytic converter (s) and / or one or more secondary catalytic converter (s), in particular one or more oxidation catalytic converter (s) which have an oxidation catalytic converter. Coating comprises / s, and / or one or more heating catalytic converter (s) and / or one or more gasoline engine particle filters and / or one or more NOx storage catalytic converter (s) and / or one or more exhaust gas aftertreatment component (s), in particular coated with gaseous exhaust gas aftertreatment. which comprise a NOx storage catalytic converter coating, and / or one or more SCR system (s) and / or one or more exhaust gas aftertreatment component / s, which comprise an SCR coating / t, and / or comprises a secondary air injection, or that the exhaust gas aftertreatment system comprises the main catalyst (s) and the NOx13 / 55

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Storage catalytic converter and optionally one or more pre-catalytic converter (s) and / or one or more secondary catalytic converter (s), in particular one or more oxidation catalytic converter (s) comprising an oxidation catalytic converter coating (s), and / or one or more heating catalytic converter (s) and / or one or more, in particular gaseous exhaust gas aftertreatment-coated, gasoline engine particle filter / s and / or one or more NOx storage catalytic converter / s and / or one or more exhaust gas aftertreatment component / s which comprises a NOx storage catalytic converter coating / s, and / or one or more SCR system / s and / or one or more exhaust gas aftertreatment component / s, which comprises an SCR coating / s, and / or a secondary air injection is formed.

If appropriate, it is provided that the exhaust gas aftertreatment system comprises a main catalytic converter designed and / or acting as a 3-way catalytic converter, optionally an oxidation catalytic converter, a gasoline engine particle filter and the NOx storage catalytic converter, the main catalytic converter possibly being arranged in front of the gasoline engine particle filter and the gasoline engine particle filter in front of the NOx storage catalytic converter, or that the exhaust gas aftertreatment system is formed from a main catalytic converter designed and / or acting as a 3-way catalytic converter, optionally an oxidation catalytic converter, a gasoline engine particle filter and the NOx storage catalytic converter, the main catalytic converter optionally being arranged upstream of the gasoline engine particle filter and the gasoline engine particle filter upstream of the NOx storage catalytic converter. The oxidation catalytic converter can be provided upstream of the gasoline engine particle filter and / or upstream of the NOx storage catalytic converter.

It is optionally provided that in the storage mode of the NOx storage catalytic converter the oxygen content of the exhaust gas located in the main catalytic converter is less than 5% by volume or essentially zero.

Where appropriate, it is provided that in all exhaust gas aftertreatment components of the exhaust gas aftertreatment system which are arranged upstream of the NOx storage catalytic converter, in particular before the confluence of the supply line, the

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Oxygen content in the storage operation of the NOx storage catalytic converter is low, in particular less than 5% by volume, or is essentially zero.

If appropriate, it is provided that the oxygen and in particular the air are fed to the NOx storage catalytic converter in its storage mode via the feed line which leads into the exhaust gas aftertreatment system after the main catalytic converter, in particular after a 3-way catalytic converter and before the NOx storage catalytic converter and / or that the oxygen and in particular the air is fed to the NOx storage catalytic converter in its storage mode via the supply line which opens into the exhaust gas aftertreatment system after a gasoline engine particle filter and before the NOx storage catalytic converter.

If necessary, it is provided that air, in particular air compressed by a turbocharger of the gasoline engine, is supplied to the NOx storage catalytic converter, that the air enters the supply line between a compressor and a charge air cooler of the turbocharger and that the air after the main catalytic converter or after the Petrol engine particle filter exits the supply line before the NOx storage catalytic converter.

This means that in storage mode, air from the environment can flow through the compressor of the turbocharger, through the supply line and then through the oxidation catalytic converter and the NOx storage catalytic converter which may be provided.

In particular, it is provided that air compressed by the compressor of the turbocharger enters the supply line after the compressor of the turbocharger and exits the supply line before the NOx storage catalytic converter, in particular after the main catalytic converter.

If necessary, it is provided that ambient air, preferably filtered or compressed, is supplied to the NOx storage catalytic converter, that the ambient air from the environment enters the supply line, in particular unidirectionally, and that the ambient air is downstream of the main catalytic converter and upstream of the NOx storage catalytic converter Feed line exits.

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This means that in the storage mode, ambient air can flow through the supply line and then through the oxidation catalytic converter which may be provided and the NOx storage catalytic converter.

In particular, it is provided that air, in particular uncompressed and / or filtered ambient air, enters the supply line and exits the supply line before the NOx storage catalytic converter, in particular after the main catalytic converter.

It is optionally provided that the ambient air is drawn in automatically by the exhaust gas flow present in the exhaust gas aftertreatment system, in particular unidirectionally, and in particular that the ambient air is introduced into the exhaust gas aftertreatment system via a venturi nozzle.

In particular, it can be provided that one end of the feed line opens into the environment, in particular outside the exhaust gas aftertreatment system, and the other end into the exhaust gas aftertreatment system.

Furthermore, a suppression can be present in the exhaust gas aftertreatment system or arise when exhaust gas flows through the exhaust gas aftertreatment system. It may thus be possible that air from the surroundings is sucked into the exhaust gas aftertreatment system, in particular upstream of the NOx storage catalytic converter, through the supply line, in particular automatically, by means of this suppression.

In particular, the ambient air can be introduced into the exhaust gas aftertreatment system via a venturi nozzle. If appropriate, it is provided that the exhaust gas aftertreatment system comprises a Venturi nozzle in the area in which the supply line opens into the exhaust gas aftertreatment system.

In particular, it can be provided that the feed line into the exhaust gas aftertreatment system comprises a safety device, such as a check valve or a membrane, thereby causing the exhaust gas to flow out

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It is optionally provided that air, in particular air compressed by a turbocharger of the gasoline engine, is supplied to the NOx storage catalytic converter, the air entering the supply line between a charge air cooler of the turbocharger and the gasoline engine, or the air between a compressor and a Charge air cooler of the turbocharger enters the supply line, and that the air exits the supply line after the main catalytic converter and before the NOx storage catalytic converter.

This means that in storage mode, air from the environment can flow through the compressor of the turbocharger, through the supply line and then through the oxidation catalytic converter and the NOx storage catalytic converter which may be provided.

In particular, it is provided that air compressed by the compressor of the turbocharger enters the feed line after the compressor of the turbocharger and exits the feed line before the NOx storage catalytic converter, in particular after the main catalytic converter.

In all embodiments, it can be provided that the supplied air exits the supply line after the main catalytic converter and before the oxidation catalytic converter which may be provided, before the gasoline engine particle filter and before the NOx storage catalytic converter.

In all embodiments, it can be provided that the supplied air exits the supply line after the main catalytic converter and after the gasoline engine particle filter and before the oxidation catalytic converter which may be provided and before the NOx storage catalytic converter.

If appropriate, it is provided that after the gasoline engine and before the main catalytic converter, in particular in the front area of the main catalytic converter, a, in particular catalytically coated, heating element for heating the

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Main catalytic converter is provided and / or that a, in particular catalytically coated, heating element for heating the oxidation catalytic converter is provided after the gasoline engine, in particular after the main catalytic converter and before the oxidation catalytic converter, in particular in the front area of the oxidation catalytic converter and / or that after the gasoline engine, in particular after the oxidation catalytic converter and before the gasoline engine particle filter, in particular in the front area of the gasoline engine particle filter, a, in particular catalytically coated, heating element is provided for heating the gasoline engine particle filter and / or after the gasoline engine, in particular after the gasoline engine particle filter, and the NOx storage catalytic converter, in particular in the front area of the NOx storage catalytic converter, a, in particular catalytically coated, heating element is provided for heating the NOx storage catalytic converter.

The heating elements can be powered by the vehicle electrical system, which in particular has a nominal voltage of 12 volts or 48 volts.

If appropriate, it is provided that at least one heating element is provided in front of each exhaust gas aftertreatment component of the exhaust gas aftertreatment system, in particular in the front area of each exhaust gas aftertreatment component. For example, the main catalytic converter and / or the oxidation catalytic converter and / or the gasoline engine particle filter and / or the NOX storage catalytic converter and / or all other components of the exhaust gas aftertreatment system can reach the functional temperature (light-off temperature) required for their efficient function earlier.

In particular, provision is made for a heating element to be provided in front of the NOx storage catalytic converter in order to be able to heat the NOx storage catalytic converter quickly to its functional temperature, particularly when the internal combustion engine is cold started, and thus to minimize the emission of harmful gaseous emissions such as CO, THC or NOx emissions. Since the NOx storage catalytic converter generally requires a lower temperature to function than the 3-way catalytic converter, the NOx emissions emitted by the gasoline engine can be absorbed by the NOx storage catalytic converter during a cold start.

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Furthermore, it may be advantageous for the, in particular catalytically coated, heating element in front of an oxidation catalytic converter, in front of the gasoline engine particle filter, which optionally includes an oxidation catalytic converter coating and / or a NOx storage catalytic converter function, in front of a separate NOx storage catalytic converter component and / or in front of the overall grouping of the exhaust gas aftertreatment components, is arranged in order to enable an active 3-way function as early as possible after or preferably when the engine is started, in addition to the above-mentioned advantage regarding NOx emissions.

Furthermore, the heating elements and the heating of the individual catalysts which is made possible thereby can be used for their desulfurization.

In particular, this may make it possible to desulfurize the NOx storage catalytic converter using the heating element. Since the NOx storage catalytic converter can in particular also be arranged as the last exhaust gas component in the exhaust gas aftertreatment system, such desulfurization has the least thermal influence on the other exhaust gas aftertreatment components. In contrast to conventional processes, no additional fuel or only a small amount of additional fuel is required for the desulfurization and the particle emissions are also essentially not increased. The temperature required for the desulfurization, in particular the temperature window required for the desulfurization, can be above that at which storage of nitrogen oxides is possible. To avoid unwanted nitrogen oxide emissions, the NOx storage catalytic converter may be completely regenerated before desulfurization takes place.

It is optionally provided that the exhaust gas and the air supplied in the storage mode are first heated by a heating element and then flow through the NOx storage catalytic converter, and that the heating element is provided in front of the NOx storage catalytic converter, in particular in the front area of the NOx storage catalytic converter.

It is optionally provided that the NOx storage catalytic converter is part of a gasoline engine particle filter and / or that the NOx storage catalytic converter is in the rear

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Area of a gasoline engine particle filter is arranged and / or that in the front area of the gasoline engine particle filter an oxidation catalyst coating, such as in particular a platinum metal coating, a platinum coating, a rhodium coating and / or a palladium coating is provided.

If appropriate, it is provided that the gasoline engine arrangement in an operating phase, the normal operating phase, possibly a coasting operating phase and regeneration mode, includes that the gasoline engine is operated and / or regulated in the lambda window preferably in a lambda window by λ = 1 and / or that the coasting operating phase is controlled by at least one Unfired overrun operating phase and / or at least one fired overrun operating phase is formed so that in the fired overrun operating phase the gas flowing through the main catalyst is low in oxygen, in particular essentially oxygen-free, and in particular the exhaust gas from a stoichiometric or sub-stoichiometric, in particular under-stoichiometric, combustion is in the gasoline engine the unfired overrun operating phase is supplied with that exhaust gas via an exhaust gas recirculation line which was generated in the gasoline engine before or during the transition from the normal operating phase into the unfired overrun operating phase, or r whereby the exhaust gas is fed to the gasoline engine in the unfired overrun operation phase via an exhaust gas recirculation line, which was generated in the gasoline engine before or during the transition from a fired overrun operation phase to the unfired overrun operation phase.

If appropriate, it is provided that the oxygen content of the exhaust gas located in the main catalyst or that the oxygen content of the exhaust gas flowing through the main catalyst in the unfired overrun operating phase essentially corresponds to the oxygen content of the exhaust gas flowing through the main catalyst in the normal operating phase or in the fired overrun operating phase.

If appropriate, it is provided that the exhaust gas aftertreatment system comprises at least one main catalytic converter and a gasoline engine particle filter that is downstream of the main catalytic converter and that can be regenerated using oxygen and / or nitrogen dioxide, that in a regeneration operation via one or the

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AVL List GmbH feed line leading into the exhaust gas aftertreatment system upstream of the gasoline engine particle filter, oxygen and in particular air, preferably filtered ambient air, is supplied for regeneration of the gasoline engine particle filter, the oxygen content of the exhaust gas flowing through the main catalyst or of the exhaust gas located in the main catalyst being less than 5 vol. % or essentially zero, and / or wherein the amount of oxygen of the exhaust gas flowing through the main catalyst during the regeneration operation or the amount of oxygen of the exhaust gas located in the main catalyst is kept so low that the efficiency of the main catalyst is unaffected.

In particular, it is provided to use the oxygen introduced through the supply line in combination, and to use this oxygen to operate the NOx storage catalytic converter in its storage mode on the one hand and the gasoline engine particle filter in its regeneration mode on the other hand. As a result, it may be possible to regenerate a gasoline engine particulate filter positioned in front of the NOx storage catalytic converter in operating areas of the gasoline engine arrangement in which regeneration has hitherto not been possible due to lack of oxygen.

If necessary, it is provided that the supply line supplying oxygen to the gasoline engine particle filter and the NOx storage catalytic converter opens into the exhaust gas aftertreatment system before the gasoline engine particle filter and after the main catalytic converter.

It may be provided that the exhaust gas aftertreatment system comprises an SCR catalytic converter arranged downstream of the main catalytic converter, the oxidation catalytic converter and / or the gasoline engine particle filter, that the SCR catalytic converter is arranged upstream of the NOx storage catalytic converter, and that the SCR catalytic converter is used to reduce the nitrogen oxides in the SCR catalytic converter's reduction mode Oxygen and in particular air, preferably ambient air, optionally filtered or compressed, is supplied via one or the feed line leading into the exhaust gas aftertreatment system, the oxygen content of the main catalyst

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The exhaust gas flowing through AVL List GmbH in the reduction mode is less than 5% by volume or essentially zero, and / or the amount of oxygen in the exhaust gas flowing through the main catalyst in the reduction mode is kept so low that the efficiency of the main catalyst is unaffected.

It is optionally provided that oxygen, in particular ambient air, is fed to the gasoline engine particle filter, the oxidation catalytic converter, the NOx storage catalytic converter and / or the SCR catalytic converter via a supply line.

Alternatively, it is provided that oxygen, in particular ambient air, is supplied to the gasoline engine particle filter, the oxidation catalytic converter, the NOx storage catalytic converter and / or the SCR catalytic converter via a separate supply line.

If necessary, it is provided that an operating material, in particular what is known as AdBlue®, is introduced into the exhaust gas aftertreatment system from a metering device upstream of the SCR catalytic converter, in particular after the oxidation catalytic converter, the operating material containing a reducing agent for reducing nitrogen oxide or being convertible into a reducing agent for reducing nitrogen oxide, and / or that a reducing agent for nitrogen oxide reduction, in particular ammonia NH3, by the main catalytic converter, in particular by the 3-way catalytic converter, as part of normal gasoline engine operation and / or by temporary adjustment of the gasoline engine operating parameters of the gasoline engine, in particular by the gasoline engine being operated stoichiometrically is generated.

In particular, the invention relates to a gasoline engine arrangement, the gasoline engine arrangement comprising a gasoline engine and an exhaust gas aftertreatment system, the exhaust gas aftertreatment system comprising a main catalytic converter and a NOx storage catalytic converter arranged downstream of the main catalytic converter, an oxidation catalytic converter optionally being provided between the main catalytic converter and the NOx storage catalytic converter, the oxidation catalytic converter being provided comprises an oxidation catalyst coating, fuel and air being converted into exhaust gas in a normal operating phase in the gasoline engine, the gasoline engine arrangement opening into the exhaust gas aftertreatment system,

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AVL List GmbH in particular comprises unidirectionally flowed, supply line, and wherein the gasoline engine arrangement is set up to carry out the method according to the invention.

It is optionally provided that the gasoline engine is designed as a gasoline engine regulated in a lambda window by λ = 1 in front of the exhaust gas aftertreatment system.

If appropriate, it is provided that the supply line opens into the exhaust gas aftertreatment system in front of the NOx storage catalytic converter, the supply line branching off between a compressor and a charge air cooler of a turbocharger of the gasoline engine, or the supply line branching off between a charge air cooler of a turbocharger of the gasoline engine and the gasoline engine, or wherein the supply line branches off branches off between the air filter and a compressor of a turbocharger of the gasoline engine.

If necessary, it is provided that the supply line opens into the exhaust gas aftertreatment system in front of the NOx storage catalytic converter, the supply line comprising a blower which is fed from the intake tract and / or ambient air, and / or the supply line comprising a pressure accumulator, in particular a compressed air accumulator.

If appropriate, it is provided that a controllable and / or regulatable fan for conveying the oxygen, in particular for conveying the air, is provided along the supply line. In particular, the blower can be designed as a secondary air pump, as an electrical compressor or as a mechanical compressor.

If necessary, this can also be used, continuously or discontinuously, to fill a pressure accumulator, which in turn serves as an oxygen accumulator, in particular an air accumulator, and is arranged in the supply line between a blower, a mechanical compressor and / or an electrical compressor and the outlet into the exhaust system.

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AVL List GmbH

If appropriate, provision is made for air to be introduced into the exhaust gas aftertreatment system from the pressure reservoir filled with air via the supply line.

It may be provided that the supply line opens into the exhaust gas aftertreatment system in front of the NOx storage catalytic converter, and / or that the supply line for introducing air from the environment outside the gasoline engine arrangement is open to the ambient air, in particular unidirectionally, in the direction of the exhaust gas aftertreatment system, and / or that the ambient air is automatically sucked into the exhaust gas aftertreatment system by the exhaust gas flow present in the exhaust gas aftertreatment system, and / or that the ambient air is introduced into the exhaust gas aftertreatment system via a venturi nozzle.

If appropriate, it is provided that the exhaust gas aftertreatment system comprises a main catalytic converter designed as a 3-way catalytic converter and / or acting as a 3-way catalytic converter, optionally a pre-, heating or secondary catalytic converter, optionally the oxidation catalytic converter, a gasoline engine particle filter and / or the NOx storage catalytic converter, where appropriate, the pre-catalytic converter or heating catalytic converter is arranged upstream of the main catalytic converter, the main catalytic converter upstream of the oxidation catalytic converter, the oxidation catalytic converter upstream of the gasoline engine particulate filter and the gasoline engine particulate filter upstream of the NOx storage catalytic converter, or the exhaust gas aftertreatment system consists of a 3-way catalytic converter and / or a third -Way one-way main catalyst, optionally a pre-heater, or secondary catalyst, optionally the oxidation catalyst, a gasoline engine particulate filter and / or the NOx storage catalyst, where appropriate the pre-catalyst or Heizkata lysator before the main catalyst, the main catalyst before the oxidation catalyst, the oxidation catalyst before the gasoline engine particulate filter and the gasoline engine particle filter is arranged in front of the NOx storage catalyst.

If appropriate, it is provided that one or the oxidation catalyst coated with an oxidation catalyst coating is provided between the main catalyst and the NOx storage catalyst, in particular between the main catalyst and the gasoline engine particle filter, and / or that one or the

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AVL List GmbH

Oxidation catalyst is a gasoline engine particle filter provided with an oxidation catalyst coating at least in its front region, and / or that the gasoline engine particle filter comprises an oxidation catalyst coating, the oxidation catalyst coating preferably being applied in the flow direction of the exhaust gas from the front of the gasoline engine particle filter, and that the oxidation catalyst Coating comprises a platinum metal, such as in particular platinum, rhodium and / or palladium.

It is preferably provided that the oxidation catalyst coating is set up to convert nitrogen monoxide NO with oxygen O2 to nitrogen dioxide NO2.

It may be provided that the gasoline engine particle filter is uncoated or as a 2-way catalytic converter or as a 3-way catalytic converter or as a 4-way catalytic converter, or that the gasoline engine particle filter is not a catalytic converter or a 2-way catalytic converter or a 3-way catalytic converter or comprises a 4-way catalyst.

It can be provided that the gasoline engine particle filter is uncoated in its embodiment and is only set up to filter particles.

It can be provided that the gasoline engine particle filter is set up to filter particles and, in addition or in combination or in combination, to convert and / or store hydrocarbons, carbon monoxide and nitrogen oxides. As a result, depending on the coating, the gasoline engine particle filter is designed as a 2, 3 or 4-way catalytic converter.

It can be provided that the gasoline engine particle filter is set up to filter particles, store NOx and convert hydrocarbons, carbon monoxide and nitrogen oxides. As a result, the gasoline engine particle filter is designed as a 3-way catalytic converter with a storage function.

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If appropriate, it is provided that a venturi nozzle is provided for introducing the ambient air in the supply line into the exhaust gas aftertreatment system and that the venturi nozzle opens into the exhaust gas aftertreatment system in front of the NOx storage catalytic converter.

It is optionally provided that a controllable and / or regulatable fan for conveying the oxygen, in particular the air, is provided in the supply line and / or that a supply valve is provided along the supply line, the supply valve for regulating the amount of oxygen supplied to the NOx storage catalytic converter and in particular the air is set up and / or that the supply line comprises a safety device, such as in particular a check valve or a switchable valve which is closed in particular when de-energized.

It is optionally provided that an oxidation catalyst coated with an oxidation catalyst coating is provided between the main catalyst and the gasoline engine particle filter, or that the gasoline engine particle filter is provided with an oxidation catalyst coating at least in its front region, the oxidation catalyst coating being set up to NO with Implement 02 to N02.

It is optionally provided that a, in particular catalytically coated, heating element for heating the main catalyst is provided after the gasoline engine and upstream of the main catalytic converter, in particular in the front area of the main catalytic converter, and / or that after the gasoline engine, in particular after the main catalytic converter, and before Oxidation catalytic converter, in particular in the front area of the oxidation catalytic converter, a, in particular catalytically coated, heating element is provided for heating the oxidation catalytic converter, and / or that after the gasoline engine, in particular after the oxidation catalytic converter, and before the gasoline engine particle filter, in particular in the front area of the gasoline particle filter, in particular, catalytically coated heating element is provided for heating the gasoline engine particle filter, and / or that after the gasoline engine, in particular after the gasoline engine particle filter, and in front of a NOx storage catalytic converter, in particular in the front area of the NOx storage catalytic converter alysators,

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AVL List GmbH a, in particular catalytically coated, heating element for heating the NOx storage catalytic converter is provided.

If appropriate, it is provided that the gasoline engine arrangement comprises a gasoline engine and an exhaust gas aftertreatment system with at least the main catalytic converter, the gasoline engine particle filter and a NOx storage catalytic converter, that the main catalytic converter is designed or acts as a 3-way catalytic converter, and that the main catalytic converter is the gasoline engine particle filter, which is optionally called the 4th -Way catalytic converter acts, is arranged downstream that the gasoline engine particle filter is followed by the NOx storage catalytic converter and that one or the oxidation catalytic converter is optionally arranged upstream of the NOx storage catalytic converter.

It may be provided that the NOx storage catalytic converter is the last catalytic converter of the exhaust gas aftertreatment system in the flow direction of the exhaust gas.

In the context of the present invention, a front area of an exhaust gas aftertreatment component is to be understood as the area which the exhaust gas flows through earlier in the flow direction of the exhaust gas in the respective exhaust gas aftertreatment component. In particular, this can be the area through which the exhaust gas enters the respective exhaust gas aftertreatment component.

In the context of the present invention, a rear area of an exhaust gas aftertreatment component is to be understood as the area which the exhaust gas later flows through in the flow direction of the exhaust gas in the respective exhaust gas aftertreatment component. In particular, this can be the area through which the exhaust gas emerges from the respective exhaust gas aftertreatment component.

Further features according to the invention may result from the claims, the description of the exemplary embodiments and the figures.

The invention will now be explained further using the example of exemplary, non-exclusive and / or non-limiting exemplary embodiments.

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1a, 1b, 1c and 1d show a schematic graphic representation of variants of a first embodiment of a gasoline engine arrangement according to the invention,

2a, 2b, 2c, 2d and 2e show a schematic graphic representation of variants of a second embodiment of a gasoline engine arrangement according to the invention,

3a and 3b show a schematic graphic representation of variants of a third embodiment of a gasoline engine arrangement according to the invention,

4 shows a schematic graphic representation of a fourth embodiment of a gasoline engine arrangement according to the invention, and

5a, 5b and 5c show a schematic graphic representation of variants of a fifth embodiment of a gasoline engine arrangement according to the invention.

Unless otherwise stated, the reference numerals correspond to the following components: gasoline engine 1, exhaust gas aftertreatment system 2, main catalytic converter 3, gasoline engine particle filter 4, turbocharger 5, throttle valve 6, compressor 7, turbine 8, exhaust gas recirculation line 9, NOx storage catalytic converter 10, heating element 11, feed valve 12, Charge air cooler 13, supply line 14, venturi nozzle 15 and housing 16, oxidation catalytic converter 17, further main catalytic converter 18, filter device 19, safety device 20, blower 21 and pressure accumulator 22.

In all variants it can be provided that an oxidation catalytic converter 17 is arranged in front of the NOx storage catalytic converter 10. The oxidation catalytic converter 17 can be set up to convert NO with O2 to NO2. Furthermore, it can be provided that the supply line 14 in front of the oxidation catalytic converter 17 and in front of the NOx storage catalytic converter 10 opens into the exhaust gas aftertreatment system 2, so that oxygen, in particular air, flows through the NOx storage catalytic converter 10, the oxidation catalytic converter 17 and the NOx storage catalytic converter 10 in the storage mode .

For example, part of the NOx storage catalytic converter 10 can be set up to convert the NO of the exhaust gas to NO2 using the oxygen introduced through the supply line 14. This part of the NOx storage catalytic converter 10 has an oxidation catalytic converter coating, which is an element of the platinum metals

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AVL List GmbH or platinoids comprises or is formed from an element of platinum metals or platinoids.

1a, 1b, 1c and 1d show schematic graphic representations of different variants of a first embodiment of a gasoline engine arrangement according to the invention, which is suitable and / or set up for carrying out the method according to the invention.

In this embodiment, the gasoline engine arrangement comprises a gasoline engine 1 and an exhaust gas aftertreatment system 2. The exhaust gas aftertreatment system 2 comprises a main catalytic converter 3, a gasoline engine particle filter 4 arranged downstream of the main catalytic converter 3 and a NOx storage catalytic converter 10 downstream of the gasoline engine particle filter 4. In this embodiment, the main catalytic converter 3 is designed as a 3-way catalytic converter and arranged directly after the turbine 8 of the turbocharger 5, in particular close to the engine.

Furthermore, the gasoline engine arrangement of FIGS. 1a, 1b, 1c and 1d comprises a turbocharger 5 and a throttle valve 6. The turbocharger 5 comprises a compressor 7 and a turbine 8. According to FIG. 1b, the gasoline engine arrangement additionally comprises one compared to the gasoline engine arrangement of FIG. 1a Exhaust gas recirculation line 9, namely a high-pressure EGR line of a high-pressure EGR system.

In the normal operating phase, which corresponds to the regular operation of the gasoline engine arrangement, fuel is supplied to the gasoline engine 1. In the normal operating phase, the fuel is converted with air to an exhaust gas.

In the normal operating phase, the gasoline engine 1 is operated and / or regulated in a lambda window by λ = 1. This means that the gasoline engine 1 is operated oscillating by a lambda value λ of 1.0, and in particular is operated and / or in the range from λ = 0.9 to 1.1, preferably from λ = 0.95 to 1.05 is regulated. According to this embodiment, it can be provided that the gasoline engine 1 is operated and / or regulated in phases or permanently, rich or lean in its normal operating phase.

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AVL List GmbH

According to this embodiment, the exhaust gas emitted by the gasoline engine 1 in the normal operating phase is essentially oxygen-free. According to this embodiment, the gasoline engine 1 is operated in the storage mode of the NOx storage catalytic converter 10 essentially the same as in the normal operating phase. This means that even in storage mode, the exhaust gas emitted by the gasoline engine 1 is essentially oxygen-free.

In all embodiments, it is provided that the oxygen quantity of the exhaust gas flowing through the main catalyst 3 during the storage operation of the NOx storage catalyst 10 or the oxygen quantity of the exhaust gas located in the main catalyst 3 is so small that the efficiency of the main catalyst 3 is essentially unaffected. As a result, the effectiveness, in particular the efficiency, of the main catalytic converter 3, in particular the 3-way catalytic converter, is the same before and after the storage operation of the NOx storage catalytic converter 10.

In particular, it can be provided that the oxygen content of the exhaust gas flowing through the main catalytic converter 3 or of the exhaust gas located in the main catalytic converter 3 during the storage operation of the NOx storage catalytic converter 10 is below 5% by volume vol.% Or essentially zero.

This makes it possible to solve the conflict of objectives mentioned above and to create a method and a gasoline engine arrangement which enables low fuel consumption and low pollutant emissions.

In other words, the introduction of air into the exhaust gas aftertreatment system 2, which is necessary in conventional operation, which is necessary in storage operation on the one hand for converting nitrogen monoxide to nitrogen dioxide and on the other hand for storing nitrogen dioxide in the NOx storage catalytic converter 10, can be avoided and / or reduced.

It is preferably provided that oxygen, in particular air, flows through only the NOx storage catalyst 10 and possibly the catalyst coated with the oxidation catalyst coating during storage operation.

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This means that even in storage mode, comparatively hot engine exhaust gas remains essentially without free oxygen in the main catalytic converter 3. In this way, any storage of oxygen in the main catalytic converter 3 that may occur and the subsequent rich operation of the gasoline engine 1 that may be necessary as a result can be avoided.

In the storage mode of the NOx storage catalytic converter 10, according to this embodiment, the oxidation catalytic converter 17 and the NOx storage catalytic converter 10, which may be provided, are supplied with oxygen, in particular air, through a supply line 14.

According to this embodiment, the supply line 14 opens before the NOx storage catalytic converter 10 into the exhaust gas aftertreatment system 2 and branches off between the compressor 7 and the charge air cooler 13 of the turbocharger 5.

This means that the oxygen and in particular the air in the storage mode of the NOx storage catalytic converter 10 is compressed air by a turbocharger 5 of the gasoline engine 1. Furthermore, the compressed air enters the supply line 14 after the compressor 7 and before the charge air cooler 13 of the turbocharger 5 and out of the supply line 14 after the gasoline engine particle filter 4 and before the NOx storage catalytic converter 10.

According to this embodiment, in the supply line 14 a device regulating or preventing the introduction of air, namely a supply valve 12, is provided, with which the oxygen supply, in particular the air supply, is controlled and / or regulated by the supply line 14.

The gasoline engine 1 generates an exhaust gas by converting fuel both in the normal operating phase and in the storage mode of the NOx storage catalytic converter 10. This exhaust gas first flows through the turbine 8 of the turbocharger 5, then the main catalytic converter 3, then the gasoline engine particulate filter 4, optionally the oxidation catalytic converter 17 and then the NOx storage catalytic converter 10, before it exits into the environment.

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In the storage mode of the NOx storage catalytic converter 10, the nitrogen monoxide contained in the exhaust gas is converted to nitrogen dioxide on or in the oxidation catalytic converter coating and the nitrogen dioxide generated is stored at least temporarily in the NOx storage catalytic converter 10.

1c, a heating element 11 is additionally provided in the front region of the NOx storage catalytic converter 10.

The heating element 11 makes it possible to quickly heat the NOx storage catalytic converter 10 to its functional temperature, in particular when the gasoline engine arrangement or the gasoline engine 1 is cold started. This can reduce or prevent the emission of NOx emissions. Preferably, the nitrogen oxides emitted by the gasoline engine 1 are taken up and / or stored by the NOx storage catalytic converter 10 until the functional temperature of the main catalytic converter 3 designed as a 3-way catalytic converter is reached.

According to FIG. 1d, the supply line 14 opens in front of the gasoline engine particle filter 4, which includes the NOx storage catalytic converter 10, into the exhaust gas aftertreatment system 2. According to this figure, the NOx storage catalytic converter 10 is arranged in the rear area of the gasoline engine particle filter 4.

2a, 2b, 2c, 2d and 2e show schematic representations of different variants of a second embodiment of a gasoline engine arrangement according to the invention, which is suitable and / or set up for carrying out the method according to the invention. The features of the embodiment according to FIGS. 2a, 2b, 2c, 2d and 2e can preferably correspond to the features of the embodiments according to FIGS. 1a, 1b, 1c and 1d.

In contrast to the variants of the first embodiment of a gasoline engine arrangement according to the invention, the oxygen necessary for the storage operation of the NOx storage catalytic converter 10, in particular the air, is introduced into the exhaust gas aftertreatment system 2 through a venturi nozzle 15.

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According to this embodiment, the feed line 14, in particular one end of the feed line 14, opens into the exhaust gas aftertreatment system 2 in front of the NOx storage catalytic converter 10. Furthermore, the feed line 14, in particular the other end of the feed line 14, is open to the environment. This means that the other end of the feed line 14 opens into an area outside the gasoline engine arrangement.

In this embodiment, the oxygen or air in the storage mode of the NOx storage catalytic converter 10, in particular directly, enters the supply line 14 from the surroundings and exits the supply line 14 after the gasoline engine particulate filter 4 upstream of the NOx storage catalytic converter 10.

According to this embodiment, it is provided that the exhaust gas aftertreatment system 2 is designed as a venturi nozzle 15 in the area in which the supply line 14 opens into the exhaust gas aftertreatment system 2.

This creates a suppression when exhaust gas aftertreatment system 2 is flowed through. As a result of this suppression, air is automatically sucked in from the environment through the supply line 14 into the exhaust gas aftertreatment system 2 and introduced in front of the NOx storage catalytic converter 10.

According to FIG. 2d, the feed line 14 opens into an area in front of the gasoline engine particle filter 4, which includes the NOx storage catalytic converter 10, into the exhaust gas aftertreatment system 2. According to this figure, the NOx storage catalytic converter 10 is arranged in the rear area of the gasoline engine particle filter 4.

The variant according to FIG. 2e has a further main catalytic converter 18 in addition to the variant according to FIG. 2a.

3a and 3b show schematic graphic representations of different variants of a third embodiment of a gasoline engine arrangement according to the invention, which is suitable and / or set up for carrying out the method according to the invention. The features of the embodiment according to the

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FIGS. 3a and 3b can preferably correspond to the features of the embodiments according to FIGS. 1a, 1b, 1c, 1d, 2a, 2b, 2c, 2d and 2e.

In this embodiment, a housing 16, namely a steel housing, is provided, in which the gasoline engine particle filter 4, optionally the oxidation catalytic converter 17 and the NOx storage catalytic converter 10 are arranged.

In this embodiment, the feed line 14 opens in front of the housing 16.

Alternatively, a controllable and / or regulatable blower 21 is provided, which controls and / or regulates the flow rate of the oxygen, in particular the flow rate of the air, which is introduced through the supply line 14 into the exhaust gas aftertreatment system 2, in particular upstream of the NOx storage catalytic converter 10 can be.

FIG. 4 shows a schematic graphic representation of a fourth embodiment of a gasoline engine arrangement according to the invention, which is suitable and / or set up for carrying out the method according to the invention. The features of the embodiment according to FIG. 4 can preferably correspond to the features of the embodiments according to FIGS. 1a, 1b, 1c, 1d, 2a, 2b, 2c, 2d, 2e, 3a and 3b.

According to this embodiment, the exhaust gas aftertreatment system 2 comprises a main catalytic converter 3, an oxidation catalytic converter 17, a gasoline engine particle filter 4 and a NOx storage catalytic converter 10.

Ambient air is introduced into the exhaust gas aftertreatment system 2 upstream of the oxidation catalytic converter 17 via a supply line 14.

In the oxidation catalytic converter 17, NO can be converted to NO2 with O2, whereby on the one hand the gasoline engine particle filter 4 can be regenerated with NO2 and on the other hand the nitrogen oxides can be stored in the NOx storage catalytic converter 10.

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5a, 5b and 5c show schematic graphic representations of variants of a fifth embodiment of a gasoline engine arrangement according to the invention, which is suitable and / or set up for carrying out the method according to the invention. The features of the embodiment according to FIGS. 5a to 5c can preferably correspond to the features of the embodiments according to FIGS. 1a, 1b, 1c, 1d, 2a, 2b, 2c, 2d, 2e, 3a, 3b and 4.

According to FIG. 5a, ambient air, which was filtered via a filter device 19, is introduced into the exhaust gas aftertreatment system 2 upstream of the oxidation catalyst 17 and the NOx storage catalyst 10 which may be provided. A supply valve 12 and a securing device 20 are provided on the supply line 14.

According to FIG. 5b, a further main catalytic converter 18 is arranged between the main catalytic converter 3 and the gasoline engine particle filter 4. The ambient air filtered by the filter device 19 is introduced upstream of the NOx storage catalytic converter 10 by means of a blower 21, which in this embodiment is designed as an electrical compressor 7.

According to FIG. 5c, the air is introduced in front of the compressor 7 of the turbocharger 5 via a fan 21 in a pressure accumulator 22. The air can then be introduced into the exhaust gas aftertreatment system 2 upstream of the NOx storage catalytic converter 10 via the pressure accumulator 22.

The effects according to the invention can be achieved by means of these exemplary configurations.

The invention is not limited to the illustrated embodiments, but encompasses any method and any gasoline engine arrangement according to the following patent claims.

Claims (32)

1. Method for operating a gasoline engine arrangement, the gasoline engine arrangement comprising a gasoline engine (1) and an exhaust gas aftertreatment system (2), the exhaust gas aftertreatment system (2) comprising a main catalytic converter (3) and a NOx storage catalytic converter (10) downstream of the main catalytic converter (3) , In a normal operating phase in the gasoline engine (1), fuel and air are converted into exhaust gas, characterized in that in the storage mode of the NOx storage catalytic converter (10) the NOx storage catalytic converter (10) via a supply line (14) opening into the exhaust gas aftertreatment system (2). Oxygen and in particular air, preferably filtered and / or compressed ambient air, are supplied such that an oxidation catalyst (17) is optionally provided between the main catalyst (3) and the NOx storage catalyst (10) and that the oxidation catalyst (17) comprises an oxidation catalyst coating , wherein the oxygen content of the main catalyst (3) du flowing exhaust gas or the exhaust gas located in the main catalyst (3) in storage mode is less than 5 vol.% or essentially zero, and / or wherein the amount of oxygen flowing through the main catalyst (3) in the storage mode or the amount of oxygen in the main catalyst (3 ) Exhaust gas is kept so low that the efficiency of the main catalyst (3) is unaffected. 2. The method according to claim 1, characterized in that in the normal operating phase, the exhaust gas of the gasoline engine (1) the main catalyst (3), optionally the oxidation catalyst (17) and the NOx storage catalyst (10) is fed in that the main catalyst (3) is designed or acts as a 3-way catalytic converter, 36/55 PP32056AT AVL List GmbH and that the gasoline engine (1) is operated or regulated in its normal operating phase, preferably in a lambda window by λ = 1. 3. The method according to claim 1 or 2, characterized in that in storage operation before or in the NOx storage catalyst (10), in particular on the oxidation catalyst coating, NO is converted to NO2 with the oxygen supplied through the supply line (14), and that the NO2 formed is at least partially stored in the NOx storage catalytic converter (10) at least temporarily. 4. The method according to any one of the preceding claims, characterized in that through the feed line (14) to the NOx storage catalyst (10) supplied, in particular unidirectionally supplied, oxygen volume flow or air volume flow, in particular via a feed valve (12), is controlled or regulated. 5. The method according to any one of the preceding claims, characterized in that the exhaust gas aftertreatment system (2) the main catalyst (s) (3, 18) and the NOx storage catalyst (10) and optionally one or more pre-catalyst (s) and / or one or a plurality of secondary catalytic converter (s), in particular one or more oxidation catalytic converter (s) (17), which comprises an oxidation catalytic converter coating, and / or one or more heating catalytic converter (s) and / or one or more, in particular gaseous exhaust gas aftertreatment-coated, Gasoline engine particle filter (4) and / or one or more NOx storage catalytic converter (s) (10) and / or one or more exhaust gas aftertreatment components / s, which comprise a NOx storage catalytic converter coating, and / or one or more SCR systems / s and / or one or more exhaust gas aftertreatment component (s), which comprise an SCR coating / t, and / or comprises a secondary air injection, or that the exhaust gas aftertreatment system (2) from the main catalyst (s) (3, 18) and the NOx storage catalyst (10) and 37/55 PP32056AT AVL List GmbH, if applicable, one or more pre-catalyst (s) and / or one or more secondary catalyst (s), in particular one or more oxidation catalyst (s) (17), which / includes pure oxidation catalyst coating, and / or one or more heating catalyst (s) and / or one, in particular one or more gaseous exhaust gas aftertreatment, gasoline engine particle filter (s) (4) and / or one or more NOx storage catalytic converter (s) (10) and / or one or more exhaust gas aftertreatment component (s) which comprises a NOx storage catalytic converter coating / s, and / or one or more SCR system (s) and / or one or more exhaust gas aftertreatment component (s), which comprises an SCR coating (s), and / or a secondary air injection. 6. The method according to any one of the preceding claims, characterized in that in the storage mode of the NOx storage catalytic converter (10) the oxygen content of the exhaust gas located in the main catalytic converter (3) is less than 5 vol.% Or essentially zero. 7. The method according to any one of the preceding claims, characterized in that the oxygen and in particular the air to the NOx storage catalyst (10) in its storage mode over the after the main catalyst (3), in particular after a 3-way catalyst, and before NOx storage catalytic converter (10) is fed into the supply line (14) opening into the exhaust gas aftertreatment system (2), and / or in that the oxygen and in particular the air operate in the storage mode of the NOx storage catalytic converter (10) via a gasoline engine particle filter (4) and upstream of the NOx storage catalytic converter (10) in the exhaust gas aftertreatment system (2) opening supply line (14) is supplied. 8. The method according to any one of the preceding claims, characterized in that 38/55 PP32056AT AVL List GmbH that air, in particular air compressed by a turbocharger (5) of the gasoline engine (1), is supplied to the NOx storage catalytic converter (10), that the air between a compressor (7) and a charge air cooler (13) of the turbocharger (5) enters the supply line (14) and that the air exits the supply line (14) after the main catalytic converter (3) or after the gasoline engine particulate filter (4) and before the NOx storage catalytic converter (10). 9. The method according to any one of the preceding claims, characterized in that the NOx storage catalyst (10) in storage operation, preferably filtered or compressed, ambient air is supplied, that the ambient air from the environment enters the supply line (14), in particular unidirectionally, and that the ambient air exits the supply line (14) after the main catalytic converter (3) and before the NOx storage catalytic converter (10). 10. The method according to claim 9, characterized in that the ambient air automatically by the in the Exhaust gas aftertreatment system (2) existing exhaust gas flow, in particular unidirectionally, is sucked in, and in particular that the ambient air is introduced into the exhaust gas aftertreatment system (2) via a venturi nozzle (15). 11. The method according to any one of the preceding claims, characterized in that the NOx storage catalyst (10) in the storage mode air, in particular by a turbocharger (5) of the gasoline engine (1) compressed air is supplied, the air between a charge air cooler (13 ) of the turbocharger (5) and the gasoline engine (1) enters the feed line (14), 39/55 PP32056AT AVL List GmbH or wherein the air between a compressor (7) and a charge air cooler (13) of the turbocharger (5) enters the supply line (14), and that the air exits after the main catalytic converter (3) and before the NOx storage catalytic converter (10) the feed line (14) emerges. 12. The method according to any one of the preceding claims, characterized in that after the gasoline engine (1) and before the main catalyst (3), in particular in the front region of the main catalyst (3), a, in particular catalytically coated, heating element (11) for heating the Main catalyst (3) is provided, and / or that after the gasoline engine (1), in particular after the main catalyst (3), and before the oxidation catalyst (17), in particular in the front area of the oxidation catalyst (17), a, in particular catalytically coated, Heating element (11) is provided for heating the oxidation catalytic converter (17), and / or that after the gasoline engine (1), in particular after the oxidation catalytic converter (17), and before the gasoline engine particle filter (4), in particular in the front area of the gasoline engine particle filter (4) , a, in particular catalytically coated heating element (11) is provided for heating the gasoline engine particle filter (4), and / or that after the gasoline engine (1), in particular ere after the gasoline engine particle filter (4) and the NOx storage catalytic converter (10), in particular in the front area of the NOx storage catalytic converter (10), a, in particular catalytically coated, heating element (11) is provided for heating the NOx storage catalytic converter (10) . 13. The method according to any one of the preceding claims, characterized in that the NOx storage catalytic converter (10) is part of a gasoline engine particle filter (4) and / or that the NOx storage catalyst (10) is arranged in the rear region of a gasoline engine particle filter (4) , 40/55 PP32056AT AVL List GmbH and / or that an oxidation catalyst coating, such as in particular a platinum metal coating, a platinum coating, a rhodium coating and / or a palladium coating, is provided in the front area of the gasoline engine particle filter (4). 14. The method according to any one of the preceding claims, characterized in that the gasoline engine arrangement in an operating phase, the normal operating phase, possibly a coasting operating phase and the regeneration mode, comprises that the gasoline engine (1) in the normal operating phase preferably operated in a lambda window by λ = 1 and / or it is regulated that the overrun operation phase is formed by at least one unfired overrun operation phase and / or at least one fired overrun operation phase, that in the fired overrun operation phase the gas flowing through the main catalyst (3) is low in oxygen, in particular essentially oxygen-free, and in particular the exhaust gas of a stoichiometric one or sub-stoichiometric, in particular sub-stoichiometric, combustion, the gasoline engine (1) being supplied in the unfired overrun phase of that exhaust gas via an exhaust gas recirculation line (9) which before or during the transition from the normal operating phase to d he unfired overrun operating phase was generated in the gasoline engine (1), or wherein the exhaust gas is fed via an exhaust gas recirculation line (9) to the gasoline engine (1) in the unfired overrun operating phase, which before or during the transition from a fired overrun operating phase to the unfired overrun operating phase in the gasoline engine ( 1) was generated. 15. The method according to any one of the preceding claims, characterized in that the oxygen content of the exhaust gas located in the main catalyst (3) or that the oxygen content of the exhaust gas flowing through the main catalyst (3) in the unfired overrun phase in 41/55 PP32056AT AVL List GmbH Essentially corresponds to the oxygen content of the exhaust gas flowing through the main catalyst (3) in the normal operating phase or in the fired overrun operating phase. 16. The method according to any one of the preceding claims, characterized in that the exhaust gas aftertreatment system (2) comprises at least one main catalyst (3) and one downstream of the main catalyst (3), using oxygen and / or nitrogen dioxide regenerable gasoline engine particle filters (4), that In a regeneration mode, oxygen and in particular air, preferably filtered ambient air, is fed in via a supply line (14) leading into the exhaust gas aftertreatment system (2) upstream of the gasoline engine particle filter (4) for regeneration of the gasoline engine particle filter (4), the oxygen content of the main catalyst ( 3) flowing exhaust gas or the exhaust gas located in the main catalyst (3) in the regeneration mode is less than 5 vol .-% or substantially zero, and / or wherein the amount of oxygen flowing through the main catalyst (3) in the regeneration mode or the amount of oxygen in the Main catalyst (3) Exhaust gas is kept so low that the efficiency of the main catalyst (3) is unaffected. 17. The method according to any one of the preceding claims, characterized in that the exhaust gas aftertreatment system (2) comprises a SCR catalytic converter downstream of the main catalytic converter (3), the oxidation catalytic converter (17) and / or the gasoline engine particle filter (4), that the SCR catalytic converter the NOx storage catalytic converter (10) is arranged such that, in the reduced mode of the SCR catalytic converter, the SCR catalytic converter for reducing the nitrogen oxides via one or the supply line (14) opening into the exhaust gas aftertreatment system (2) 42/55 PP32056AT AVL List GmbH Oxygen and in particular air, preferably ambient air, optionally filtered or compressed, is supplied, the oxygen content of the exhaust gas flowing through the main catalyst (3) in the reduction mode being less than 5% by volume or essentially zero, and / or in the reduction mode the amount of oxygen flowing through the main catalyst (3) of the exhaust gas is kept so low that the efficiency of the main catalyst (3) is unaffected. 18. The method according to any one of the preceding claims, characterized in that a fuel, in particular so-called AdBlue®, from a metering device before the SCR catalyst, in particular after the oxidation catalyst (17), is introduced into the exhaust gas aftertreatment system (2), the fuel contains a reducing agent for nitrogen oxide reduction or can be converted into a reducing agent for nitrogen oxide reduction, and / or that a reducing agent for nitrogen oxide reduction, in particular ammonia NH3, through the main catalytic converter (3), in particular through the 3-way catalytic converter, as part of normal petrol engine operation and / or if necessary, temporary adjustment of the gasoline engine operating parameters of the gasoline engine (1), in particular by operating the gasoline engine (1) under substoichiometric, is generated. 19. Gasoline engine arrangement, the gasoline engine arrangement comprising a gasoline engine (1) and an exhaust gas aftertreatment system (2), the exhaust gas aftertreatment system (2) comprising a main catalytic converter (3) and a NOx storage catalytic converter (10) arranged downstream of the main catalytic converter (3), where appropriate a An oxidation catalyst (17) is provided between the main catalyst (3) and the NOx storage catalyst (10), the oxidation catalyst (17) comprising an oxidation catalyst coating, 43/55 PP32056AT AVL List GmbH whereby in a normal operating phase in the gasoline engine (1), fuel and air are converted into exhaust gas, the gasoline engine arrangement comprising a supply line (14) which opens into the exhaust gas aftertreatment system (2), in particular flows through unidirectionally, characterized in that the gasoline engine arrangement for Execution of the method according to one of claims 1 to 18 is set up. 20. Gasoline engine arrangement according to claim 19, characterized in that the gasoline engine (1) is designed as a gasoline engine (1) regulated in a lambda window by λ = 1 in front of the exhaust gas aftertreatment system (2). 21. Gasoline engine arrangement according to claim 19 or 20, characterized in that the feed line (14) in front of the NOx storage catalytic converter (10) opens into the exhaust gas aftertreatment system (2), the feed line (14) between a compressor (7) and a charge air cooler ( 13) of a turbocharger (5) of the gasoline engine (1), or wherein the supply line (14) branches off between a charge air cooler (13) of a turbocharger (5) of the gasoline engine (1) and the gasoline engine (1), or wherein the supply line ( 14) branches off between the air filter and a compressor (7) of a turbocharger (5) of the gasoline engine (1). 22. Gasoline engine arrangement according to one of claims 19 to 21, characterized in that the feed line (14) in front of the NOx storage catalytic converter (10) opens into the exhaust gas aftertreatment system (2), the feed line (14) comprising a blower (21) which is fed from the intake tract and / or ambient air, and / or wherein the supply line (14) comprises a pressure accumulator (22), in particular a compressed air accumulator. 44/55 PP32056AT AVL List GmbH 23. Otto engine arrangement according to one of claims 19 to 22, characterized in that the supply line (14) opens before the NOx storage catalytic converter (10) into the exhaust gas aftertreatment system (2), and / or that the supply line (14) for introducing air the environment outside the gasoline engine arrangement to the ambient air, in particular unidirectionally, is opened in the direction of the exhaust gas aftertreatment system (2), and / or that the ambient air is automatically drawn into the exhaust gas aftertreatment system (2) by the exhaust gas flow present in the exhaust gas aftertreatment system (2), and / or that the ambient air is introduced into the exhaust gas aftertreatment system (2) via a venturi nozzle (15). 24. Gasoline engine arrangement according to claim 19 to 23, characterized in that the exhaust gas aftertreatment system (2) is designed as a 3-way catalyst and / or acting as a 3-way catalyst main catalyst (3), optionally a pre-heating or secondary catalyst , optionally the oxidation catalytic converter (17), a gasoline engine particle filter (4) and / or the NOx storage catalytic converter (10), the precatalyst or heating catalytic converter possibly upstream of the main catalytic converter (3), the main catalytic converter (3) upstream of the oxidation catalytic converter (17), the oxidation catalytic converter (17) is arranged in front of the gasoline engine particle filter (4) and the gasoline engine particle filter (4) in front of the NOx storage catalytic converter (10), or that the exhaust gas aftertreatment system (2) consists of a 3-way catalytic converter and / or a 3-way catalytic converter Main catalyst acting catalyst (3), optionally a pre, heating, or secondary catalyst, optionally the oxidation catalyst (17), a gasoline engine particle film ter (4) and / or the NOx storage catalyst (10) is formed, where appropriate the pre-catalyst or heating catalyst upstream of the main catalyst (3), the main catalyst (3) upstream of the oxidation catalyst (17), the oxidation catalyst (17) upstream of the gasoline engine particle filter (4) and the 45/55 PP32056AT AVL List GmbH Gasoline engine particle filter (4) is arranged in front of the NOx storage catalytic converter (10). 25. Gasoline engine arrangement according to one of claims 19 to 24, characterized in that between the main catalytic converter (3) and the NOx storage catalytic converter (10), in particular between the main catalytic converter (3) and the gasoline engine particulate filter (4), one or the one with an oxidation catalyst coating Coated oxidation catalyst (17) is provided, and / or that one or the oxidation catalyst (17) is a gasoline engine particle filter (4) provided at least in its front area with an oxidation catalyst coating, and / or that the gasoline engine particle filter (4) is an oxidation catalyst Coating comprises, wherein the oxidation catalyst coating is preferably applied in the flow direction of the exhaust gas from the front of the gasoline engine particle filter (4), and that the oxidation catalyst coating comprises a platinum metal, such as in particular platinum, rhodium and / or palladium. 26. Gasoline engine arrangement according to one of claims 19 to 25, characterized in that the gasoline engine particle filter (4) is uncoated or designed as a 2-way catalyst or as a 3-way catalyst or as a 4-way catalyst, or that the gasoline engine particle filter ( 4) does not include a catalyst or a 2-way catalyst or a 3-way catalyst or a 4-way catalyst. 27. Otto engine arrangement according to one of claims 19 to 26, characterized in that a venturi nozzle (15) for introducing the ambient air into the supply line (14) is provided in the exhaust gas aftertreatment system (2), 46/55 PP32056AT AVL List GmbH and that the venturi nozzle (15) opens into the exhaust gas aftertreatment system (2) in front of the NOx storage catalytic converter (10). 28. Gasoline engine arrangement according to one of claims 19 to 27, characterized in that a controllable and / or regulatable fan (21) for conveying oxygen, in particular the air, is provided in the feed line (14), and / or that along the feed line ( 14) a supply valve 12 is provided, the supply valve (12) being set up to regulate the amount of oxygen supplied to the NOx storage catalytic converter (10) and in particular the air, and / or the supply line (14) is a safety device (20), such as in particular a check valve or a switchable valve, which is closed in particular when de-energized. 29. Gasoline engine arrangement according to one of claims 19 to 28, characterized in that an oxidation catalyst (17) coated with an oxidation catalyst coating is provided between the main catalyst (3) and the gasoline engine particle filter (4), or that the gasoline engine particle filter (4) at least in is provided in its front area with an oxidation catalyst coating, the oxidation catalyst coating being set up to convert NO with O2 to NO2. 30. Gasoline engine arrangement according to one of claims 19 to 29, characterized in that after the gasoline engine (1) and before the main catalyst (3), in particular in the front region of the main catalyst (3), a, in particular catalytically coated, heating element (11) Heating of the main catalyst (3) is provided, 47/55 PP32056AT AVL List GmbH and / or that after the gasoline engine (1), especially after the main catalytic converter (3), and before the oxidation catalytic converter (17), especially in the front area of the oxidation catalytic converter (17), a, in particular catalytically coated, heating element (11) is provided for heating the oxidation catalytic converter (17), and / or that after the gasoline engine (1), in particular after the oxidation catalytic converter (17), and upstream of the gasoline engine particle filter (4), in particular in the front area of the gasoline engine particle filter (4) Catalytically coated heating element (11) is provided for heating the gasoline engine particle filter (4), and / or that after the gasoline engine (1), in particular after the gasoline engine particle filter (4), and in front of a NOx storage catalytic converter (10), in particular in the front area of the NOx storage catalytic converter (10), a, in particular catalytically coated, heating element (11) is provided for heating the NOx storage catalytic converter (10). 31. Gasoline engine arrangement according to one of claims 19 to 30, characterized in that the gasoline engine arrangement comprises a gasoline engine (1) and an exhaust gas aftertreatment system (2) with at least the main catalyst (3), the gasoline engine particle filter (4) and a NOx storage catalyst (10) that the main catalytic converter (3) is designed or acts as a 3-way catalytic converter, that the gasoline engine particle filter (4), which optionally acts as a 4-way catalytic converter, is arranged after the main catalytic converter (3), that the gasoline engine particle filter (4) NOx storage catalytic converter (10) is arranged downstream, and that one or the oxidation catalytic converter (17) is optionally arranged in front of the NOx storage catalytic converter (10). 48/55 PP32056AT AVL List GmbH 32. Gasoline engine arrangement according to one of claims 19 to 31, characterized in that the NOx storage catalytic converter (10) in the flow direction of the exhaust gas is the last catalyst of the exhaust gas aftertreatment system (2).