WO2020069549A1 - Petrol engine arrangement and method comprising an nsc system - Google Patents

Abstract

The invention relates to a petrol engine arrangement and to a method for operating the petrol engine arrangement, wherein the petrol engine arrangement comprises a petrol engine (1) and an exhaust gas aftertreatment system (2) having a main catalytic converter (3), a petrol engine particulate filter (4) and a lean NOx trap (10), wherein the main catalytic converter (3) is designed or acts as a 3-way catalytic converter, the petrol engine particulate filter (4), which optionally acts as a 4-way catalytic converter, is arranged downstream of the main catalytic converter (3), the lean NOx trap (10) is arranged downstream of the petrol engine particulate filter (4), and an oxidation catalytic converter (18) is optionally arranged upstream of the lean NOx trap (10).

Description

 Gasoline engine arrangement and method with an NSC system

The invention relates to a gasoline engine arrangement and a method according to the

Preambles of the independent claims.

Different methods for operating an internal combustion engine are known from the prior art, for example operation within a lambda window by l = 1, which may be due to unfired ones

Overrun phases can be interrupted.

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 as storage materials.

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 the case with a conventional one

Diesel arrangement is guaranteed. 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.

Furthermore, methods for operating a diesel engine are known, in which an oxidation catalyst coated with an oxidation catalyst coating is provided, the oxidation catalyst coating being set up to

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 is filtered when penetrating a porous filter wall of an exhaust gas filter. 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 from fibers or powder, for example. 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, when the particles are deposited on the surface or in the interior of the filter wall, a particle layer influencing 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 being load-free

Filtration efficiency improved even further, on the other hand the flow resistance and thus also the differential pressure generated by the exhaust gas volume flow increases

Exhaust filter.

Also in the gasoline engine arrangement, as is already the case with conventional ones

Diesel arrangements are known to regenerate the exhaust gas filter at a

Correspondingly high soot loading is required to prevent excessive back pressure or undesired temperature peaks that could damage the component if the soot burns up

To be able to reduce or prevent particle filters. Since a gasoline engine arrangement has a significantly lower particle emission level in combination with a significantly higher exhaust gas temperature level in comparison with a diesel arrangement, regeneration is less necessary in the gasoline engine arrangement.

The active initiation of regeneration of the gasoline engine particulate filter is carried out at

However, a gasoline engine arrangement is also necessary at the latest if the exhaust gas back pressure exceeds an exhaust gas back pressure threshold value due to the particle loading, at which the exhaust gas emission is severely hampered and in particular potentially sustainable damage-relevant component limit values of the engine or the

Exhaust gas treatment system are exceeded. In conventional gasoline engine arrangements is compared to conventional

Diesel arrangements, on the one hand, increase the exhaust gas temperature, 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 gasoline engine arrangement in order to further reduce or lower the already low nitrogen oxide level after the at least one main catalytic converter, in particular the 3-way catalytic converter, in particular in the direction of ambient air limit values. It is therefore the object of the invention, the so-called vision of "zero impact emission"

to come closer, in order to provide the end customer with a gasoline engine arrangement that is economical in terms of fuel consumption and, on the other hand, to protect the environment by falling as far as possible below the pollutant emissions laws prescribed by law.

The object of the invention is particularly characterized by the features of

independent claims solved.

The invention relates to a gasoline engine arrangement, the gasoline engine arrangement comprising a gasoline engine and an exhaust gas aftertreatment system with at least one

Main catalyst, a gasoline engine particle filter and a NOx storage catalyst, wherein the main catalyst is designed or acts as a 3-way catalyst, and wherein the main catalyst is the gasoline engine particle filter, which optionally acts as a 4-way catalyst.

According to the invention, it is provided that the gasoline engine particle filter is followed by the NOx storage catalytic converter and that, if appropriate, a further catalytic converter, in particular an oxidation catalytic converter is arranged upstream of the NOx storage catalytic converter.

The NOx storage catalytic converter is arranged, in particular, in the last position, that is to say furthest downstream, of the exhaust gas aftertreatment storage unit. As a result, the NOx storage catalytic converter is arranged very far away from the engine itself, which contradicts its actually assigned function.

The gasoline engine arrangement can be the gasoline engine arrangement

Internal combustion engine, in particular the gasoline engine arrangement

Motor vehicle.

The gasoline engine arrangement comprises one gasoline engine and one

Exhaust aftertreatment system. The exhaust gas aftertreatment system comprises a main catalytic converter, in particular a 3-way catalytic converter, a gasoline engine particle filter downstream of the main catalytic converter and a gasoline engine particle filter

downstream NOx storage catalytic converter.

The NOx storage catalytic converter may be at a position in the

Exhaust aftertreatment system positioned in which the exhaust gas temperature when entering the NOx storage catalytic converter has a lower temperature than when exiting the gasoline engine.

Furthermore, the exhaust gas aftertreatment system can include the main catalytic converter (s), the gasoline engine particle filter 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)

Oxidation catalyst coating comprises / s, and / or one or more

Heating catalyst (s) and / or one or more, in particular gaseous

Exhaust gas aftertreatment-coated, gasoline engine particle filter and / or one or more NOx storage catalyst (s) and / or one or more

Exhaust aftertreatment component (s), which comprise a NOx storage catalytic converter coating, and / or one or more SCR system (s) and / or one or a plurality of exhaust gas aftertreatment components that comprise an SCR coating and / or include a secondary air injection.

Furthermore, the exhaust gas aftertreatment system can consist of the main catalytic converter (s), the gasoline engine particle filter 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 one

Oxidation catalyst coating comprises / and / or one or more heating catalyst (s) and / or one, in particular one or more gaseous exhaust gas aftertreatment coated gasoline engine particle filter (s) and / or one or more NOx storage catalyst (s) and / or one or more

Exhaust aftertreatment component (s), which comprises a NOx storage catalytic converter coating, and / or one or more SCR system (s) and / or one or more exhaust aftertreatment component (s), which comprises an SCR coating, and / or a secondary air injection be educated.

In a preferred embodiment, the gasoline engine particle filter and the NOx storage catalytic converter are provided on a common carrier body. In a further preferred embodiment, the gasoline engine particle filter and the NOx storage catalytic converter are provided on two support bodies arranged one behind the other. This makes it possible to decouple the two exhaust gas aftertreatment components, in particular thermally. In particular, the two can be provided

Exhaust aftertreatment components to be arranged in a housing, in particular in a steel housing, in order to enable a compact design.

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

Since the NOx storage catalyst after the main catalyst and after

Gasoline engine particle filter is arranged, the NOx storage catalyst can be protected from high exhaust gas temperatures, especially in areas close to the engine the exhaust gas aftertreatment system of a gasoline engine that works at high temperatures.

This means that if necessary, the exhaust gas emitted by the gasoline engine

Flow through the exhaust gas aftertreatment system and in the

Exhaust aftertreatment system arranged to cool exhaust aftertreatment components. As a result, the exhaust gas flows through the NOx storage catalytic converter at a temperature which is lower than the entry temperature into the exhaust gas aftertreatment system. Thereby, on the one hand, thermal stresses, but in particular also thermal aging effects in the NOx storage catalytic converter can be reduced and / or prevented, whereby the life of the NOx storage catalytic converter can be increased, in particular maximized. If the NOx storage catalytic converter were arranged close to the engine, it would be due to the very high

Temperatures may not be functional for long.

Optionally, oxygen, in particular air, is fed to the optionally provided further catalyst, in particular the oxidation catalyst and the NOx storage catalyst. In this so-called storage mode, the nitrogen oxides emitted by the gasoline engine, in particular in the form of nitrogen dioxide NO2, can be stored at least temporarily and, if necessary, the stored nitrogen oxides can be converted back to nitrogen N2 if the NOx storage catalytic converter or the exhaust gas flowing through the NOx storage catalytic converter 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 the

different NOx storage catalyst coating technologies

different "light off" storage temperature required for storage must be reached. Subsequently, the storage temperature should exceed a maximum value as little as possible so as not to fall out of a so-called storage window.

Furthermore, the gasoline engine arrangement according to the invention makes it possible for the nitrogen oxides emitted by the gasoline engine in the form of NO2 in the NOx storage catalytic converter to be saved and subsequently converted into water, carbon dioxide and nitrogen, for example.

For example, if barium Ba is used as the storage material in the NOx storage catalytic converter, the storage runs from those emitted by the gasoline engine

Nitrogen oxides according to the following regulation:

It may also be possible for the stored nitrogen dioxide to be released again by adding carbon monoxide CO and / or hydrocarbon HC and the resulting decomposition of the nitrate. If, for example, barium Ba is used as storage material, this withdrawal takes place in the

Essentially according to the following regulation:

Ba (N0 ₃ ) ₂ + CO - * BaC0 ₃ + 2 NO + 0 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:

1

HC + 2 NO + 0 ₂ + -H ₂ + CO -> H ₂ 0 + 2 C0 ₂ + JV ₂

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

2 NO + 0 ₂ ^ 2 N0 ₂ 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 platinum, rhodium and / or palladium.

Furthermore, this oxidation catalyst coating can be set up to convert any NH3 which 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 -> 4 NO _x + 6 H ₂ 0 where x = {1,2}

In particular, the oxidation catalyst with oxygen can minimize or reduce any NH3 formed. The resulting reaction products,

The nitrogen oxides, in particular, can then be fed to an, preferably best, effective NOx aftertreatment, such as a NOx storage catalytic converter.

This makes it possible to by-products and intermediates of catalytic reactions, such as NH3, in the catalysts, especially in the

Oxidation catalyst to oxidize and in this oxidation in

Oxidation catalyst resulting reaction products, in particular the nitrogen oxides, to provide the best possible NOx aftertreatment. In particular, it is possible that NH3 is formed in the main catalytic converter, especially in the 3-way catalytic converter, if CO or H2 is present in the exhaust gas.

To store nitrogen oxides in the NOx storage catalytic converter, oxygen and in particular air can be supplied to both the NOx storage catalytic converter and the oxidation catalytic converter coating. As a result, nitrogen monoxide can be reacted with oxygen to form nitrogen dioxide in a first step and the nitrogen dioxide thus generated can be stored in the NOx storage catalytic converter in a second step. Within the scope of the present invention, at least one of them is included

Main catalytic converter or the main catalytic converter to understand 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 catalyst comprises one or more catalysts, in particular one or more pre- or secondary catalysts and / or one or more

Heating catalyst / 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 may be provided that the gasoline engine is designed as a gasoline engine regulated in a lambda window by l = 1 in front 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 l = 1. This means that the gasoline engine is optionally operated in a manner oscillating around a lambda value l of 1.0, and in particular is operated and / or regulated with a lambda value l 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 the exhaust gas aftertreatment components of the gasoline engine arrangement permit a sufficiently high, in particular, under these conditions

best possible raw emissions conversion.

This may mean that in the normal operating phase, in the storage mode of the NOx storage catalytic converter and / or in the regeneration mode of the A sufficient, preferably the largest possible degree of conversion of the pollutants by the exhaust gas aftertreatment components should be ensured in total in the gasoline engine particle filter. This can be a sufficiently high

Pollutant reduction can be made possible in both operating phases. In particular, it is provided that the degree of pollutant emissions conversion of the

Exhaust gas treatment system at no time

 Pollutant emission conversion level falls below the threshold value, below which there is no longer a sufficiently high pollutant emission reduction. If necessary, it is provided that the

 Pollutant emission conversion degree threshold is as large as possible, especially in an area 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.

If appropriate, it is provided that the gasoline engine particle filter, in particular in its front region, has the oxidation catalyst, the

Oxidation catalyst is applied in particular in the flow direction of the exhaust gas from the front of the gasoline engine particle filter, and / or that the NOx storage catalyst, in particular in its front area, the

Oxidation catalyst and / or that the oxidation catalyst is provided between the main catalyst and the gasoline engine particle filter and / or that the oxidation catalyst is provided between the gasoline engine particle filter and the NOx storage catalyst, wherein the oxidation catalyst comprises a platinum metal, preferably platinum, rhodium and / or palladium.

If appropriate, it is provided that the oxidation catalyst is a

Has oxidation catalyst coating, acts as an oxidation catalyst and / or is formed from an oxidation catalyst coating.

The oxidation catalyst coating comprises an element of the platinum metals or platinoids or is made of an element of the platinum metals or platinoids such as in particular platinum, rhodium and / or palladium. In English, platinum metals or platinoids are also referred to as platinum group metals (PGM).

The oxidation catalyst coating is set up to convert nitrogen monoxide NO with oxygen O2 to nitrogen dioxide NO2. Preferably, NO or O2 is converted to NO2 in or on the oxidation catalyst coating.

It is optionally provided that the oxidation catalyst coating comprises one or more elements of the platinum metal group, such as in particular platinum, rhodium and / or palladium, or that the oxidation catalyst coating consists of one or more elements of the platinum metal group, such as in particular one

Platinum coating, a rhodium coating and / or a palladium coating is formed.

The oxidation catalyst coating comprises an element of the platinum metal group or platinoids or is formed from an element of the platinum metal group or platinoids. In English, platinum metals or platinoids are also referred to as platinum group metals.

If appropriate, it is provided that the gasoline engine particle filter is a

Oxidation catalyst acting coating that the as

Coating which acts as an oxidation catalyst, in particular a platinum metal,

preferably comprises platinum, rhodium and / or palladium, and that the as

Oxidation catalyst acting coating in the front area of the

Gasoline engine particle filter is provided, and is applied in particular in the flow direction of the exhaust gas from the front of the gasoline engine particle filter.

If necessary, it is provided that the gasoline particle filter converts the NO2 formed with the particles stored in the gasoline particle filter to CO2 and NO, the reaction taking place in particular in accordance with the following regulation:

2 N0 ₂ + C -> 2 NO + C0 ₂ NO2 can at least partially oxidize the particles located in the gasoline engine particle filter, in particular carbon C, so that the gasoline engine particle filter can be passively regenerated.

In particular, it can be provided that the gasoline engine particle filter is at least partially regenerated as soon as NO2 is introduced into the gasoline engine particle filter and the gasoline engine particle filter the necessary for the regeneration

Has regeneration temperature.

In terms of sustainability, it can be provided that the passive

Regeneration resulting nitrogen oxides NO with appropriate

Exhaust gas aftertreatment components, such as a NOx storage catalytic converter. Furthermore, it can be provided that the CO 2 emissions generated during the passive regeneration of the gasoline engine particle filter are assigned to the regeneration for documentation purposes.

The particles emitted by the gasoline engine, in particular the soot emitted by the gasoline engine and / or the ashes emitted by the gasoline engine, are filtered by the gasoline engine particle filter. The gasoline engine particle filter is loaded with the particles emitted by the gasoline engine.

If necessary, the cleaning residue and / or the particle separation efficiency of the gasoline engine particle filter is increased by the particle residue formed from the retained particles during the filtration on the gasoline engine particle filter, as a result of which the gasoline engine particle filter has its preferably greatest possible basic filtration efficiency, defined by the substrate and coating. Furthermore, the

Otto engine particle filter, if necessary after a certain particle loading, in particular after a so-called preferably as low as possible

Basic loading, its preferably the greatest possible normal filtration efficiency. In addition, a so-called filter cake can form in the gasoline engine particle filter, particularly if the gasoline engine particle filter has large or large particles

Ash quantities is loaded. If necessary, the regeneration in the normal operating phase, in particular the soot oxidation processes, largely proceeds slowly or not at all. The

The slowdown is usually due to the lower oxygen content, in particular to the lower amount of oxygen, which the gasoline engine particle filter in the

Flows through normal operating phase. The lower the amount of oxygen introduced per unit of time, the slower the soot oxidation processes and thus the regeneration of the gasoline engine particulate filter.

According to a preferred embodiment it is provided that the

Oxidation catalyst coating is set up to convert nitrogen monoxide NO with oxygen O2 to nitrogen dioxide NO2. As a result, NO2 can be generated in or on the oxidation catalyst coating as soon as it is supplied with NO and O2. The conversion of nitrogen monoxide with oxygen to nitrogen dioxide essentially takes place according to the following rule:

Nitrogen dioxide NO2 makes it possible to at least partially oxidize the soot particles in the gasoline engine particle filter, in particular carbon C.

This may make it possible to regenerate the gasoline engine particulate filter. The

Soot oxidation essentially takes place according to the following rule:

2 N0 ₂ + C -> 2 NO + C0 ₂

The nitrogen dioxide NO2 not converted by the gasoline engine particle filter can be taken up in a further step by the NOx storage catalytic converter arranged after the gasoline engine particle filter and / or converted to water, carbon dioxide and nitrogen, if necessary.

Furthermore, in a further step, the nitrogen monoxide NO generated by the gasoline engine particle filter can be further oxidized and taken up by the NOx storage catalytic converter arranged after the gasoline engine particle filter to form nitrogen dioxide NO2 and / or converted to water, carbon dioxide and nitrogen. In particular, it is necessary for the soot oxidation processes

Regeneration temperature when using nitrogen dioxide NO2 is significantly lower than the regeneration temperature required for the soot oxidation processes when using oxygen O2.

For example, the gasoline engine particulate filter is introduced by

Nitrogen dioxide NO2 regenerates when the gasoline engine particle filter itself, the exhaust gas flowing through the gasoline engine particle filter and / or the particles located in the gasoline engine particle filter have a temperature which is greater than a regeneration temperature. In particular, the gasoline engine particle filter can be regenerated even at a regeneration temperature of less than 600 ° C., in particular less than 500 ° C., preferably between 200 ° C. and 500 ° C.

Through the use of regeneration based on nitrogen dioxide, the so-called passive regeneration, and thus the lower in

Temperatures occurring in the gasoline engine particle filter make it possible to increase, in particular to maximize, the thermal and / or thermo-mechanical aging resistance of the gasoline engine particle filter in terms of sustainability.

Furthermore, it may be possible to reduce the amount of particles in the gasoline engine particle filter without an active heating measure and / or without further C02 emissions occurring. In particular, this makes it possible to set the gasoline engine particulate filter to a low, but in any case suitably high for maximized filtration efficiency requirements

Maintain loading levels in the sense of minimizing emissions.

Furthermore, due to the lower regeneration temperature, an NOx storage catalytic converter which may be arranged after the gasoline engine particle filter can be in its optimal temperature window, in particular below 500 ° C. and preferably in one

Temperature range between 250 ° C and 450 ° C can be operated.

If appropriate, it is provided that the gasoline engine particle filter comprises the NOx storage catalytic converter, the NOx storage catalytic converter in the rear area of the gasoline engine particle filter is arranged, and / or that the gasoline engine particle filter has a coating which acts as a NOx storage catalytic converter and / or that the coating which acts as a NOx storage catalytic converter is applied in the flow direction of the exhaust gas from the rear of the gasoline engine particle filter, the coating which acts as a NOx storage catalytic converter in particular a barium component, preferably barium oxide, barium carbonate and / or a cerium oxide component.

If appropriate, it is provided that a between the main catalyst and the further catalyst, in particular the oxidation catalyst, between the

Main catalyst and the gasoline engine particulate filter and / or between the

Gasoline engine particle filter and the NOx storage catalytic converter in the

Exhaust aftertreatment system leading supply line is provided and that the supply line for supplying oxygen and in particular air is set up in the exhaust gas aftertreatment system and in particular flows through unidirectionally.

Through the supply line, the gasoline engine particle filter, the NOx storage catalytic converter and / or the further catalytic converter, in particular the

Oxidation catalyst an oxygen-containing gas, in particular air, are supplied.

In all embodiments, this means that this oxygen-containing gas, in particular the air, subsequently follows any that may be present

Oxidation catalyst or a coating acting as an oxidation catalyst, optionally the gasoline engine particle filter and the NOx storage catalyst

flows through.

By supplying oxygen, on the one hand the gasoline engine particle filter can be regenerated and / or on the other hand the nitrogen oxides can be stored and / or converted. When oxygen is supplied, the gasoline engine particle filter can operate in its regeneration mode and / or the NOx storage catalytic converter in its

Storage mode can be operated. If appropriate, provision is made to regenerate the gasoline engine particle filter by supplying oxygen. This so-called active regeneration by supplying oxygen can lead to an at least partial combustion of the

Guide the gasoline particle filter to the embedded particles. The temperature during active regeneration can be above 500 ° C, preferably above 600 ° C.

If necessary, it is provided by the supply of oxygen before

Gasoline engine particle filter to generate nitrogen dioxide NO2 and to regenerate the gasoline engine particle filter by supplying the generated NO2. This so-called passive regeneration through the supply of nitrogen dioxide can lead to an at least partial oxidation of the particles stored in the gasoline engine particle filter. The temperature during passive regeneration can be below 500 ° C, preferably between 200 ° C and 500 ° C.

If necessary, provision is made for the oxygen generated upstream of the NOx storage catalytic converter to at least temporarily store the generated and / or the existing NO2 in the NOx storage catalytic converter and, if appropriate, subsequently to convert the stored NO2 into water, carbon dioxide and nitrogen.

It is preferably provided that only the possibly before

Gasoline engine particle filter or arranged in front of the NOx storage catalytic converter

Oxidation catalyst, the gasoline engine particulate filter and / or the NOx storage catalyst in the supply of oxygen-containing gas through the supply line with oxygen-containing gas, in particular air, is or are flowed through.

In contrast to conventional methods, it is not necessary to operate the gasoline engine periodically lean or rich, since this may be provided

Oxidation catalyst, the gasoline engine particulate filter and / or the NOx storage catalyst via the supply line oxygen and in particular air is supplied. In contrast to methods known from the prior art, it may be possible to operate and / or regulate the gasoline engine, in particular always, in a lambda window by l = 1. This may make it possible for the 3-way catalytic converter and the other to act as a 3-way catalytic converter Exhaust aftertreatment components are essentially always supplied with an essentially oxygen-free or low-oxygen exhaust gas.

During the supply of air, the oxygen content of the exhaust gas flowing through the main catalyst or of the exhaust gas located in the main catalyst can be less than 5% by volume or essentially zero.

During the supply of air, 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 and / or optionally of the primary or secondary or

Heating catalyst is unaffected, so that a sufficiently high, preferably the best possible, pollutant emission conversion rate at all times

Exhaust aftertreatment components in total is ensured.

In particular, the main catalyst, the main catalysts or the

Main catalytic converter (s) and the further exhaust gas aftertreatment components have a high, preferably the best possible, efficiency in normal 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 the

Exhaust aftertreatment system, especially the main catalyst, to have to flood with oxygen.

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

If appropriate, it is provided that the gasoline engine arrangement fits into the

Exhaust gas aftertreatment system leading supply line includes that the supply line in front of the gasoline engine particulate filter, in front of the NOx storage catalyst and / or in front of the optionally provided further catalyst, in particular the oxidation catalyst opens into the exhaust gas aftertreatment system, the feed line between a compressor and a charge air cooler

Turbocharger branches off or the supply line branches off between a charge air cooler of the turbocharger and the gasoline engine or the supply line is open to the introduction of air from the environment outside the Ottomoto arrangement to the ambient air, in particular unidirectionally.

When supplying oxygen-containing gas to the exhaust gas aftertreatment system, air can be drawn in from the environment through the supply line through the compressor of the turbocharger, optionally through the charge air cooler of the turbocharger, through the supply line and then through the gasoline engine particle filter, through the NOx storage catalytic converter and / or through the optionally provided further catalyst flow, in particular the oxidation catalyst.

In particular, it is provided that air compressed by the compressor of the turbocharger enters the supply line after the compressor of the turbocharger or, if appropriate, after the charge air cooler of the turbocharger and before the optionally provided further catalytic converter, in particular before the oxidation catalytic converter, before the gasoline engine particle filter and / or before the NOx Storage catalytic converter from the

Feed line exits.

Ambient air is particularly preferred, that is air from the environment,

upstream of the oxidation catalyst coating of the gasoline particle filter of the exhaust gas aftertreatment system.

When supplying oxygen-containing gas to the exhaust gas aftertreatment system, air can pass through the supply line and then through the

Gasoline engine particle filter, through the NOx storage catalytic converter and / or through the optionally provided further catalytic converter, in particular the

Flow oxidation catalyst.

In particular, it is provided that uncompressed air, in particular uncompressed ambient air, enters the supply line and, if appropriate, before it provided further catalyst, in particular the oxidation catalyst, upstream of the gasoline engine particle filter and / or upstream of the NOx storage catalyst

Feed line exits.

If necessary, it is provided that a venturi nozzle for introducing the

Ambient air of the supply line is provided in the exhaust gas aftertreatment system and that the venturi nozzle in front of the gasoline engine particle filter

Exhaust aftertreatment system opens.

In particular, it can be provided that one end of the feed line opens into the surroundings, in particular outside the exhaust gas aftertreatment system, and the other end into the exhaust gas aftertreatment system. It can further be provided that the feed line is unidirectional in the direction of the

Exhaust gas treatment system is flowed through.

In particular, it can be provided that the feed line into the

Exhaust gas aftertreatment system comprises a safety device, such as in particular a check valve or a membrane, which prevents the exhaust gas from flowing out into the environment or into other components of the exhaust gas aftertreatment system.

Furthermore, a suppression can be present in the exhaust gas aftertreatment system or arise when exhaust gas is flowed through the exhaust gas aftertreatment system. It may thus be possible that air is sucked from the environment through the supply line into the exhaust gas aftertreatment system by this suppression and preferably upstream of the gasoline engine particle filter, upstream of the NOx storage catalytic converter and / or upstream of the optionally provided further catalytic converter, in particular that

Oxidation catalyst is introduced into the exhaust gas aftertreatment system.

In particular, the ambient air can enter the venturi nozzle

Exhaust gas treatment system are introduced. If appropriate, it is provided that the exhaust gas aftertreatment system and / or the feed line in the Area in which the supply line opens into the exhaust gas aftertreatment system is or are designed as a Venturi nozzle.

If necessary, it is provided that a controllable and / or regulatable blower for conveying the oxygen, in particular for conveying the air, is provided on the, in particular unidirectionally designed, feed line and / or that a feed valve is provided along the feed line, the feed valve being used for regulation the amount of oxygen or air that is set up to the

Otto engine particle filter, the NOx storage catalyst and / or the optionally provided further catalyst, in particular the oxidation catalyst.

If appropriate, it is provided that the supply line comprises a controllable and / or regulatable blower for conveying the oxygen, in particular for conveying the air, in particular for conveying the possibly filtered ambient air.

It is optionally provided that the supply line comprises a pressure accumulator, in particular a compressed air accumulator, for storing and / or conveying oxygen, in particular for storing and conveying the air, in particular for storing and conveying the possibly filtered ambient air.

Optionally, a pressure accumulator can be filled continuously or discontinuously by the blower and is arranged in the feed line between a blower and the junction of the feed line in the exhaust gas aftertreatment system.

The controllable and / or adjustable blower can be designed as a mechanical compressor and / or electrical compressor.

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. Through the controllable and / or adjustable blower, the delivery rate of the

Oxygen, especially the air flow, which is caused by the

Supply line in the exhaust gas aftertreatment system, especially before

Gasoline engine particle filter, in front of the NOx storage catalytic converter and / or in front of the

Oxidation catalyst is introduced, controlled and / or regulated.

If necessary, it is provided that the NOx storage catalytic converter in

Exhaust gas flow direction is the last catalyst of the

Exhaust aftertreatment system is.

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 -Catalyst or includes a 4-way catalyst.

It can be provided that the gasoline engine particle filter in one embodiment is uncoated 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 additionally, or in combination, hydrocarbons,

Implement and / or store carbon monoxide and / or 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, to store NOx and to convert hydrocarbons, carbon monoxide and nitrogen oxides. As a result, the gasoline engine particulate filter is included as a 4-way catalytic converter

Memory function trained.

It is particularly preferably provided that the NOx storage catalytic converter is designed to be heatable. This makes it possible to depend on the NOx storage catalytic converter to keep an operating point in the necessary operating window so that a predetermined operation is always ensured.

If appropriate, it is provided that after the gasoline engine and before

Main catalyst, in particular in the front area of the main catalyst, a, in particular catalytically coated, heating element for heating the

Main catalytic converter is provided and / or that 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, one, in particular catalytically

Coated heating element is provided for heating the oxidation catalyst and / or that after the gasoline engine, in particular after the oxidation catalyst, 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

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 in front of each exhaust gas aftertreatment component of the exhaust gas aftertreatment system, in particular in the front area

Exhaust aftertreatment component, at least one heating element is provided. For example, the respective catalysts and / or oxidation catalysts and / or gasoline engine particle filters and / or all other components of the

Exhaust gas aftertreatment system reaches the functional temperature (light-off temperature) required for its 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 quickly heat the NOx storage catalytic converter to its functional temperature, particularly when the internal combustion engine is cold started thus minimizing the emission of harmful, gaseous emissions such as CO, THC or NOx emissions. Since the NOx storage catalytic converter generally requires a lower temperature for its 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.

Furthermore, it may be advantageous that the catalytically coated fleece element in front of an oxidation catalyst and / or in front of the gasoline engine particle filter, which optionally includes an oxidation catalyst coating and / or a NOx storage catalyst function, or in front of a separate NOx storage catalyst component or before the overall grouping of the

Exhaust 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 advantages relating to NOx emissions.

Furthermore, the Fleizelemente and the resulting heating of the individual catalysts can be used for their desulfurization.

 In particular, this may make it possible to desulfurize the NOx storage catalytic converter with the pickling element. Since the NOx storage catalytic converter is in particular also the last exhaust gas component in the

Exhaust gas treatment system can be arranged, such a desulfurization has the least thermal influence on the others

 Exhaust aftertreatment components. In contrast to conventional processes, no additional fuel or only a small amount of additional fuel is required for desulfurization and the particle emissions are also reduced in the

Essentially not increased. The temperature required for the desulfurization, in particular the temperature window required for the desulfurization, can be above that in which nitrogen oxides can be stored. To avoid unwanted nitrogen oxide emissions, the NOx storage catalytic converter may be completely regenerated before desulfurization takes place.

If appropriate, it is provided that the gasoline engine can be operated in an operating phase that includes a normal operating phase and a coasting operating phase, that the Gasoline engine converts fuel and air into exhaust gas in the normal operating phase, that the gasoline engine is operated and / or regulated in the normal operating phase, preferably in a lambda window, by l = 1, that the overrun phase is controlled by

At least one unfired overrun operating phase and / or at least one fired overrun operating phase is formed such 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 of a stoichiometric or

sub-stoichiometric, in particular sub-stoichiometric,

Combustion is provided, an exhaust gas recirculation line being provided, which supplies the gasoline generated in the gasoline engine in an unfired overrun operating phase before or during the transition from the normal operating phase to the unfired overrun operating phase in the gasoline engine,

or wherein an exhaust gas recirculation line is provided which feeds the exhaust gas generated in the gasoline engine to the gasoline engine in an unfired overrun operation phase before or during the transition from the fired overrun operation phase to the unfired overrun operation phase.

If appropriate, it is provided that between the main catalyst and the

Gasoline engine particle filter or the oxidation catalyst coated with an oxidation catalyst coating is provided, or that the

Gasoline engine particle filter with at least in its front area

Oxidation catalyst coating is provided, wherein the oxidation catalyst coating is set up to convert NO with 02 to N02.

If appropriate, it is provided that the gasoline engine arrangement fits into the

Exhaust gas aftertreatment system comprising supply line, wherein via the supply line, the gasoline engine particle filter, in particular for regeneration of the gasoline engine particle filter, and / or the oxidation catalyst, oxygen and

in particular air, preferably filtered ambient air, can be supplied, and / or wherein oxygen and in particular air, preferably filtered ambient air, can be supplied to the NOx storage catalyst, in particular for storing and converting nitrogen oxides, and / or to the oxidation catalyst via the supply line. In particular, it is provided that introduced through the feed line

Combined use of oxygen, and with this oxygen on the one hand the NOx storage catalytic converter in its storage mode and on the other hand the

To operate the gasoline engine particle filter in his regeneration operation. This may make it possible to position one in front of the NOx storage catalytic converter

To regenerate the gasoline engine particle filter in operating areas of the gasoline engine arrangement in which regeneration could not take place until now due to lack of oxygen.

If appropriate, provision is made for the supply line to supply oxygen to the gasoline engine particle filter and the NOx storage catalytic converter in front of the

Gasoline engine particle filter and after the main catalyst in the

Exhaust aftertreatment system opens.

If appropriate, it is provided that the exhaust gas aftertreatment system comprises an SCR catalytic converter, that the SCR catalytic converter is arranged after the main catalytic converter, after the oxidation catalytic converter and / or after the gasoline engine particle filter, that the gasoline engine arrangement can flow through or flow into the exhaust gas aftertreatment system, in particular one-way flow, Feed line includes, and that via the feed line to the SCR catalyst, in particular for the reduction of

Nitrogen oxides, oxygen and in particular air, preferably filtered ambient air, can be supplied. The SCR catalytic converter is in particular always arranged upstream of the NOx storage catalytic converter.

It is optionally provided that the gasoline engine particle filter in its rear area comprises an SCR catalyst, in particular a vanadium SCR, a copper SCR or an iron-zeolite SCR, or that the gasoline engine particle filter in its rear area as an SCR catalyst, in particular as a vanadium SCR, a copper SCR or an iron-zeolite SCR, or that after the gasoline engine particle filter, an SCR catalyst, in particular a vanadium SCR, a copper SCR or an iron-zeolite SCR, is provided. It can be provided that the vanadium SCR has a lower NO2 to NOx

Has sensitivity than a comparable copper SCR or an iron zeolite SCR.

It is optionally provided that the gasoline engine particle filter, the

Oxidation catalytic converter, the NOx storage catalytic converter and / or the SCR catalytic converter is supplied with oxygen, in particular ambient air, via a supply line.

Alternatively, it is provided that the gasoline engine particle filter, the oxidation catalytic converter, the NOx storage catalytic converter and / or the SCR catalytic converter have their own

Supply line oxygen, especially ambient air, is supplied.

If appropriate, it is provided that a dosing device for introducing a. Before the SCR catalytic converter and in particular after the oxidation catalytic converter

Operating material, in particular from so-called AdBlue®, is provided. Of the

Operating fluid can contain a reducing agent such as ammonia NH3 in particular or can be converted into a reducing agent such as NH3 in particular. A urea-containing mixture, in particular a urea-water solution, such as AdBlue®, is preferably used as the operating material. If passive metering of the operating fluid is not sufficient, metering is carried out actively. It may be that up to 100% of NH3 is oxidized in certain areas by at least one palladium coating.

Furthermore, the ammonia NFI3 required for the SCR reactions can be fed through the gasoline engine, in particular through the fluff catalyst, without additional metering.

preferably by the 3-way catalyst. In particular, ammonia NFI3 is produced when the gasoline engine is operated rich, i.e. with a lambda value of less than one. In particular, ammonia NH3 is formed in the presence of CO in phases of substoichiometric conditions.

It is optionally provided that a housing, in particular a steel housing, is provided and that in the housing, in particular the oxidation catalytic converter or the gasoline engine particle filter coated with the oxidation catalytic converter coating, the NOx storage catalytic converter and / or the SCR catalytic converter or the SCR catalytic converter Coating coated gasoline engine particle filter and / or optionally

Heating element are provided.

In particular, the invention relates to a method for operating the

Gasoline engine arrangement according to the invention, wherein the gasoline engine arrangement comprises a gasoline engine and an exhaust gas aftertreatment system with a main catalyst, a gasoline engine particle filter and a NOx storage catalyst, and wherein the exhaust gas first flows through the main catalyst, then the gasoline engine particle filter and then the NOx storage catalyst.

In the context of the present invention, a front area of an exhaust gas aftertreatment component is to be understood as the area which is in

Flow direction of the exhaust gas in the respective exhaust aftertreatment component is flowed through earlier by the exhaust gas. 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 is one

Exhaust aftertreatment component to understand the area which in

Flow direction of the exhaust gas in the respective exhaust gas aftertreatment component is later flowed through by the exhaust gas. 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.

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

2a and 2b show schematic graphic representations of variants of a second embodiment of a gasoline engine arrangement according to the invention,

3 shows a schematic graphic representation of a third embodiment of a gasoline engine arrangement according to the invention, 4a and 4b show schematic graphic representations of variants of a fourth embodiment of a gasoline engine arrangement according to the invention,

 5 shows a schematic diagram of a fifth embodiment of a gasoline engine arrangement according to the invention, and

 6a to 6c show schematic graphic representations of variants of a sixth embodiment of a gasoline engine arrangement according to the invention.

Unless otherwise stated, the reference symbols correspond to the following

Components: gasoline engine 1, exhaust gas aftertreatment system 2, fluff catalyst 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, pickling element 11, supply valve 12, charge air cooler 13, supply line 14, venturi nozzle 15 Housing 16

Oxidation catalyst coating 17, oxidation catalyst 18, another

Main catalytic converter 19, filter device 20, safety device 21, blower 22 and pressure accumulator 23.

1 a, 1 b, 1c and 1d show schematic graphic representations of

different variants of a first embodiment of a gasoline engine arrangement 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 subordinate to the main catalytic converter 3

Gasoline engine particle filter 4 and a NOx storage catalytic converter 10 arranged 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 is directly connected to the turbine 8 of the

Turbocharger 5, in particular close to the engine.

Alternatively, the exhaust gas aftertreatment system 2 comprises a main catalytic converter 3, at least one further catalytic converter, and an oxidation catalytic converter 18 one

Otto engine particle filter 4 and a NOx storage catalytic converter 10. 1 also includes a turbocharger 5 and a throttle valve 6. The turbocharger 5 comprises a compressor 7 and a turbine 8. According to FIG. 1b, the exhaust gas aftertreatment component is the

Exhaust gas aftertreatment system 2, namely the fluff catalyst 3, the

Otto engine particle filter 4 and the NOx storage catalyst 10, a fleece element 11 is provided. By means of the fleece element 11, which is fed by the vehicle electrical system, it is possible to heat up catalysts, this heating being able to be carried out flexibly and quickly.

In the normal operating phase, which corresponds to the regular operation of the gasoline engine arrangement, fuel is supplied to the gasoline engine 1. The fuel is in the

Normal operating phase with air converted to an exhaust gas.

In the normal operating phase, the gasoline engine 1 is operated and / or regulated in a lambda window by l = 1. This means that the gasoline engine 1 is operated oscillating by a lambda value l of 1.0 and is operated and / or regulated in the range from l = 0.9 to 1.1, preferably from l = 0.95 to 1.05 . 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.

According to this embodiment, the NOx storage catalytic converter 10 is shown in FIG

Exhaust gas flow direction of the last catalytic converter of the exhaust gas aftertreatment system 2. The NOx storage catalytic converter 10 is thus protected against high exhaust gas temperatures, which occur in particular in areas of the exhaust gas aftertreatment system 2 close to the engine.

 The exhaust gas emitted by the gasoline engine 1 is flowing through the

Exhaust gas aftertreatment system 2 and the exhaust gas aftertreatment components arranged in the exhaust gas aftertreatment system 2 cool down. As a result, the exhaust gas flows through the NOx storage catalytic converter 10 at a temperature which is lower than the entry temperature into the exhaust gas aftertreatment system 2. This makes it possible to reduce and / or prevent thermal stresses and thermal aging in the NOx storage catalytic converter 10 and, for example, the service life of the To increase NOx storage catalyst 10. This makes it possible to solve the conflict of objectives mentioned above and to create a method and a gasoline engine arrangement which enable low fuel consumption, low pollutant emissions and a high degree of reliability and longevity.

Since the NOx storage catalyst 10 according to this embodiment is the last

If the exhaust gas component is provided in the exhaust gas aftertreatment system 2, desulfurization of the NOx storage catalytic converter 10, if any, has the least thermal influence on the other exhaust gas aftertreatment components. During desulfurization, the NOx storage catalytic converter 10 can be targeted to its

Desulfurization temperature, in particular 700 ° C, heated and damage to other exhaust gas treatment components can be prevented and / or reduced.

If, as shown in FIG. 1 b, a heating element 11 is arranged in front of the NOx storage catalytic converter 10, the NOx storage catalytic converter 10 can be brought to its desulfurization temperature by the heating element 11. In contrast to conventional methods, no additional fuel or only a small amount of additional fuel is required for the desulfurization of the NOx storage catalytic converter 10 and the particle emissions are also essentially not increased.

1c and 1d, the gasoline engine arrangement comprises a supply line 14. The supply line 14 is set up for supplying air upstream of the NOx storage catalytic converter 10. In these variants, the oxidation catalyst coating 17 is provided in the front area of the NOx storage catalytic converter 10. In the variants of the first embodiment shown in FIGS. 1 c and 1 d, air occurs after the compressor 7 of the turbocharger 5 and before the charge air cooler 13

Turbocharger 5 in the supply line 14 and in front of the NOx storage catalyst 10 out of the supply line 14.

By supplying oxygen, the NOx storage catalytic converter 10 can

so-called storage operation. NO2 can at least temporarily stored in the NOx storage catalytic converter 10 and, if appropriate, the stored NO2 can then be converted to water, carbon dioxide and nitrogen.

In contrast to conventional methods, it is not necessary to operate the gasoline engine 1 periodically lean or rich, since oxygen and in particular air are supplied to the NOx storage catalytic converter 10 via the supply line 14. Even in contrast to the method described in the prior art, it may be possible to operate and / or regulate the gasoline engine 1, in particular always, in a lambda window by l = 1.

During the supply of oxygen, especially air, through the

Feed line 14, 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 can be less than 5% by volume or essentially zero.

During the supply of oxygen, especially air, through the

Feed line 14 can flow through the main catalytic converter 3

Oxygen amount of the exhaust gas or the amount of oxygen of the exhaust gas located in the main catalyst 3 are kept so low that the efficiency of the

Main catalyst 3 is unaffected.

According to FIGS. 1c and 1d, air is flowed through as the only exhaust gas aftertreatment component during the supply of air, the NOx storage catalytic converter 10, which comprises the oxidation catalytic converter coating 17.

According to FIG. 1 d, the gasoline engine arrangement additionally comprises an exhaust gas recirculation line 9, namely a high pressure EGR line of a high pressure EGR system, compared to the gasoline engine arrangement of FIG. 1c.

2a and 2b show schematic representations of different variants of a second embodiment of a gasoline engine arrangement according to the invention. The features of the variants of the embodiment according to FIGS. 2a and 2b can preferably correspond to the features of the embodiments according to FIGS. 1 a, 1 b, 1 c and 1d.

2a is a in the front area of the gasoline engine particle filter 4

Oxidation catalyst coating 17 is provided.

According to FIG. 2 b, an oxidation catalytic converter 18 having an oxidation catalytic converter coating 17 is provided in front of the gasoline engine particle filter 4.

The oxidation catalyst coating 17 is formed from at least one element of the platinum metals or platinoids.

In these variants, air in front of the oxidation catalytic converter 18 or the

Oxidation catalyst coating 17 comprising gasoline engine particle filter 4 are introduced into the exhaust gas aftertreatment system 2 via a feed line 14.

Furthermore, the oxidation catalyst coating 17 is set up to

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 17 as soon as it is supplied with NO and O2.

The nitrogen dioxide NO2 generated makes it possible to at least partially oxidize the combustible components of the particles located in the gasoline engine particle filter 4, in particular the carbon C. The soot oxidation takes place essentially according to the following rule:

2 N0 ₂ + C -> 2 NO + C0 ₂

During regeneration with nitrogen dioxide NO2, the so-called passive

Regeneration, the soot oxidation processes compared to the active

Regeneration can be better controlled and regulated, whereby the above-mentioned advantages are realized. Furthermore, the variants of the second embodiment make it possible for the nitrogen dioxide NO2 which has not been converted by the gasoline engine particle filter 4 to be at least temporarily stored in the NOx storage catalytic converter 10 and / or, if appropriate, to be converted into water, carbon dioxide and nitrogen.

This means that in these variants, the gasoline engine particulate filter 4

regenerated and the nitrogen oxides can be stored in the NOx storage catalytic converter 10 and optionally converted.

3 shows a schematic representation of a third embodiment of a gasoline engine arrangement according to the invention. The features of the third embodiment can preferably correspond to the features of the embodiments according to FIGS. 1 a, 1 b, 1c, 1 d, 2a and 2b.

According to the third embodiment, the gasoline engine particle filter 4 and the NOx storage catalytic converter 10 are provided on two different carrier bodies and are arranged in a housing 16, namely a steel housing.

On the one hand, this results in a thermal decoupling of the two

Exhaust aftertreatment components and, on the other hand, a compact design.

In the embodiments shown in FIGS. 1, 2 and 3, oxygen and in particular air can be introduced upstream of the gasoline engine particle filter 4, upstream of the NOx storage catalytic converter 10 and / or upstream of the oxidation catalytic converter 18 which may be provided. The oxygen supply line 14 may include a safety device 21 and a supply valve 12. Furthermore, the

Supply line 14 air from the environment or from the intake tract

Introduce the gasoline engine assembly into the exhaust gas aftertreatment system 2 and

in particular comprise a pressure accumulator 23, a blower 22 and / or an air filter. It can also be provided that parts of the

Exhaust gas aftertreatment system 2, in particular where the supply line 14 opens into the exhaust gas aftertreatment system 2, is designed as a Venturi nozzle 15. 4a and 4b show schematic representations of different variants of a fourth embodiment of a gasoline engine arrangement according to the invention. The features of the variants of the embodiment according to FIGS. 4a and 4b can preferably correspond to the features of the embodiments according to FIGS. 1a, 1b, 1c, 1d, 2a, 2b and 3.

According to FIG. 4 a, the ambient air is introduced into the exhaust gas aftertreatment system 2 via a feed line 14 opening in front of the NOx storage catalytic converter 10.

The variant according to FIG. 4b has, in addition to the variant according to FIG. 4a, another fluff catalyst 19.

In these variants, the exhaust gas aftertreatment system 2 is designed as a Venturi nozzle 15 in the region of the point where the supply line 14 opens into the exhaust gas aftertreatment system 2. Furthermore, an oxidation catalytic converter coating 17 can be provided on the NOx storage catalytic converter 10, in particular in the front area thereof.

5 shows a schematic diagram of a fifth embodiment of a gasoline engine arrangement according to the invention. The features of the embodiment according to FIG. 5 can preferably correspond to the features of the embodiments according to FIGS. 1 a, 1 b, 1 c, 1 d, 2a, 2b, 3, 4a and 4b.

According to this embodiment, the exhaust gas aftertreatment system 2 comprises a fluff catalyst 3, an oxidation catalyst 18, a gasoline engine particle filter 4 and a NOx storage catalyst 10.

Ambient air is introduced into the exhaust gas aftertreatment system 2 upstream of the oxidation catalytic converter 18 via a supply line 14.

6a, 6b and 6c show schematic graphic representations of variants of a sixth embodiment of a gasoline engine arrangement according to the invention. The Features of the embodiment according to FIGS. 6a to 6c can preferably correspond to the features of the embodiments according to FIGS. 1a, 1b, 1c, 1d, 2a, 2b, 3, 4a, 4b and 5.

According to FIG. 6a, ambient air, which was filtered via a filter device 20, is introduced into the exhaust gas aftertreatment system 2 upstream of the NOx storage catalytic converter 10. On the supply line 14 there are a supply valve 12 and a

Safety device 21 is provided.

According to FIG. 6b, another is in addition to the variant of FIG. 6a

Flaup catalytic converter 19 arranged between the flaup catalytic converter 3 and the gasoline engine particle filter 4. The ambient air filtered by the filter device 20 is in front of the NOx storage catalytic converter 10 by means of a fan 22, which is in this

Embodiment is designed as an electrical compressor 7, introduced.

According to FIG. 6c, the air in front of the compressor 7 of the turbocharger 5 is introduced into a pressure accumulator 23 via a fan 22. The air can then enter the NOx storage catalytic converter 10 via the pressure accumulator 23

Exhaust gas treatment system 2 are introduced.

Furthermore, an oxidation catalytic converter coating 17 can be provided on the NOx storage catalytic converter 10, in particular in the front area thereof.

The effects according to the invention can be achieved by means of this exemplary configuration.

The invention is not limited to the illustrated embodiments, but includes any gasoline engine arrangement and any method according to the

subsequent claims.

Claims

Claims 1. Otto engine arrangement,  the gasoline engine arrangement comprising a gasoline engine (1) and a  Exhaust gas aftertreatment system (2) with at least one main catalytic converter (3), a gasoline engine particle filter (4) and a NOx storage catalytic converter (10),  the main catalytic converter (3) being designed or acting as a 3-way catalytic converter,  and the main catalytic converter (3) is followed by the gasoline engine particle filter (4), which optionally acts as a 4-way catalytic converter,  characterized,  that the gasoline particle filter (4) is followed by the NOx storage catalytic converter (10),  and that, if appropriate, a further catalyst, in particular an oxidation catalyst (18), is arranged upstream of the NOx storage catalyst (10). 2. Otto engine arrangement according to claim 1, characterized in that the  Otto engine (1) than in a lambda window by l = 1 in front of the  Exhaust gas aftertreatment system (2) regulated gasoline engine (1) is formed. 3. Otto engine arrangement according to claim 1 or 2, characterized in  that the gasoline engine particle filter (4), in particular in its front area, has the oxidation catalyst (18), the oxidation catalyst (18) being applied, in particular in the flow direction of the exhaust gas, from the front of the gasoline engine particle filter (4),  and / or that the NOx storage catalytic converter (10), in particular in its front area, has the oxidation catalytic converter (18),  and / or that between the main catalyst (3) and the Otto engine particle filter (4) the oxidation catalyst (18) is provided, and / or that the oxidation catalyst (18) is provided between the gasoline engine particle filter (4) and the NOx storage catalyst (10), wherein the oxidation catalyst (18) comprises a platinum metal, preferably platinum, rhodium and / or palladium. 4. Otto engine arrangement according to one of the preceding claims, characterized  featured,  that the gasoline engine particle filter (4) comprises the NOx storage catalytic converter (10), the NOx storage catalytic converter (10) in the rear region of the  Otto engine particle filter (4) is arranged,  and / or that the gasoline engine particle filter (4) has a coating which acts as a NOx storage catalytic converter (10),  and / or that the coating acting as NOx storage catalytic converter (10) is applied in the flow direction of the exhaust gas from the rear of the gasoline engine particle filter (4),  the coating acting as a NOx storage catalyst (10)  in particular a barium component, preferably barium oxide,  Barium carbonate and / or a cerium oxide component. 5. Otto engine arrangement according to one of the preceding claims, characterized  featured,  that one between the main catalyst (3) and the further catalyst, in particular the oxidation catalyst (18), between the main catalyst (3) and the gasoline engine particle filter (4) and / or between the  Petrol engine particle filter (4) and the NOx storage catalytic converter (10) into the exhaust gas aftertreatment system (2) leading supply line (14) is provided,  and that the supply line (14) is set up for supplying oxygen and in particular air into the exhaust gas aftertreatment system (2) and in particular is flowed through unidirectionally. 6. Otto engine arrangement according to one of the preceding claims, characterized  featured, that the gasoline engine arrangement comprises a feed line (14) opening into the exhaust gas aftertreatment system (2), that the supply line (14) before the gasoline engine particle filter (4), before the NOx storage catalyst (10) and / or before the  provided further catalyst, in particular the oxidation catalyst (18) opens into the exhaust gas aftertreatment system (2),  the feed line (14) branching off between a compressor (7) and a charge air cooler (13) of the turbocharger (5),  or the feed line (14) branches off between a charge air cooler (13) of the turbocharger (5) and the gasoline engine (1),  or wherein the supply line (14) for introducing air from the environment outside the Ottomoto arrangement to the ambient air is open, in particular unidirectionally. 7. Otto engine arrangement according to one of the preceding claims, characterized  featured,  that a venturi nozzle (15) is provided for introducing the ambient air of the supply line (14) into the exhaust gas aftertreatment system (2),  and that the venturi nozzle (15) opens into the exhaust gas aftertreatment system (2) in front of the gasoline engine particle filter (4). 8. Otto engine arrangement according to one of the preceding claims, characterized  featured,  that a controllable and / or regulatable blower (22) for conveying the oxygen, in particular for conveying the air, is provided on the feed line (14),  and / or that a feed valve (12) is provided along the feed line (14), the feed valve (12) for regulating the feed valve (12)  The amount of oxygen or the amount of air that is set up Petrol engine particle filter (4), the NOx storage catalytic converter (10) and / or the optionally provided further catalytic converter, in particular the oxidation catalytic converter (18). 9. Otto engine arrangement according to one of the preceding claims, characterized in that the NOx storage catalyst (10) in the flow direction of the exhaust gas is the last catalyst of the exhaust gas aftertreatment system (2). 10. Otto engine arrangement according to one of the preceding claims, characterized  featured,  that the gasoline engine particle filter (4) is uncoated or is designed 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 (4) is not a catalytic converter or a 2-way catalytic converter or a 3rd -Way catalytic converter or a 4-way catalytic converter. 11. Otto engine arrangement according to one of the preceding claims, characterized  featured,  that a, in particular catalytically coated, heating element (11) for heating the main catalyst (3) is provided after the gasoline engine (1) and upstream of the main catalyst (3), in particular in the front region of the main catalyst (3),  and / or that after the gasoline engine (1), in particular after the  Main catalyst (3), and in front of the oxidation catalyst (18), in particular in the front area of the oxidation catalyst (18), a, in particular catalytically coated, heating element (11) for heating the  Oxidation catalytic converter (18) is provided,  and / or that after the gasoline engine (1), in particular after the  Oxidation catalytic converter (18), and in front of 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 after the  Otto 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). 12. Otto engine arrangement, according to one of the preceding claims, characterized in  that the gasoline engine (1) can be operated in an operating phase which comprises a normal operating phase and an overrun operating phase,  that the gasoline engine (1) converts fuel and air into exhaust gas in the normal operating phase,  that the gasoline engine (1) is operated and / or regulated in the lambda window preferably by l = 1 in the normal operating phase,  that the overrun phase by at least one unfired  Overrun phase and / or at least one fired overrun phase is formed,  that in the fired overrun phase, the gas flowing through the main catalytic converter (3) is low in oxygen, in particular essentially oxygen-free, and in particular the exhaust gas is a stoichiometric or sub-stoichiometric, in particular sub-stoichiometric, combustion,  An exhaust gas recirculation line (9) is provided which supplies the gasoline engine (1) with the exhaust gas generated in the gasoline engine (1) before or during the transition from the normal operating phase to the unfired overrun mode in an unfired overrun operating phase,  or wherein an exhaust gas recirculation line (9) is provided which, in an unfired overrun operating phase, gives the gasoline engine (1) the before or during the transition from the fired overrun operating phase to the unfired  Thrust operating phase in the gasoline engine (1) supplies exhaust gas generated. 13. Otto engine arrangement, according to one of the preceding claims, characterized in that  that one or the oxidation catalyst (18) coated with an oxidation catalyst coating (17) is provided between the main catalyst (3) and the gasoline engine particle filter (4), or that the gasoline engine particle filter (4) is provided with an oxidation catalyst coating (17) at least in its front area, wherein the oxidation catalyst coating (17) is set up to convert NO with O2 to NO2. 14. Otto engine arrangement, according to one of the preceding claims, characterized  featured,  that the gasoline engine arrangement comprises a feed line (14) opening into the exhaust gas aftertreatment system (2),  wherein oxygen and in particular air, preferably filtered ambient air, can be supplied to the gasoline engine particle filter (4), in particular for regeneration of the gasoline engine particle filter (4), and / or the oxidation catalyst (18) via the feed line (14),  and / or wherein oxygen and in particular air, preferably filtered ambient air, can be supplied to the NOx storage catalyst (10), in particular for storing and converting nitrogen oxides, and / or to the oxidation catalyst (18) via the supply line (14). 15. Otto engine arrangement, according to one of the preceding claims, characterized  featured,  that the exhaust gas aftertreatment system (2) comprises an SCR catalytic converter, that the SCR catalytic converter is arranged after the main catalytic converter (3), after the oxidation catalytic converter (18) and / or after the gasoline engine particle filter (4),  that the gasoline engine assembly one or those in the  Exhaust gas aftertreatment system (2) comprising, in particular unidirectionally flowable, feed line (14),  and that via the feed line (14) to the SCR catalytic converter, in particular for the reduction of nitrogen oxides, oxygen and in particular air,  preferably filtered ambient air can be supplied. 16. Otto engine arrangement, according to one of the preceding claims, characterized featured, that before the SCR catalyst and especially after the  Oxidation catalyst (18) a metering device for introducing a fuel, in particular so-called AdBlue®, is provided. 17. A method for operating a gasoline engine arrangement according to one of claims 1 to 16, characterized in that  that the gasoline engine arrangement a gasoline engine (1) and a  Exhaust gas aftertreatment system (2) with a main catalyst (3), a gasoline engine particulate filter (4) and a NOx storage catalyst (10), and that the exhaust gas first the main catalyst (3), then the  Gasoline particle filter (4) and then flows through the NOx storage catalyst (10).