WO2020069550A1

WO2020069550A1 - Method and petrol engine arrangement having improved exhaust gas aftertreatment by means of an overrun cut-off strategy

Info

Publication number: WO2020069550A1
Application number: PCT/AT2019/060330
Authority: WO
Inventors: Peter GÖTSCHL; Kurt Prevedel; Peter Berger; Paul DR. KAPUS; Gernot Koller
Original assignee: Avl List Gmbh
Priority date: 2018-10-05
Filing date: 2019-10-04
Publication date: 2020-04-09
Also published as: AT521758B1; DE112019004982A5; AT521758A1; CN112771263A

Abstract

The invention relates to a method and to a petrol engine arrangement, wherein the petrol engine (1) is operated in an operating phase which comprises a normal operating phase and an overrun operating phase, wherein, in the normal operating phase, propellant and air are reacted in the petrol engine (1) to form an exhaust gas, wherein in the normal operating phase the petrol engine (1) is preferably operated in a lambda window around λ=1, wherein the overrun operating phase is formed by an un-fired overrun operating phase and/or a fired overrun operating phase, wherein, in the fired overrun operating phase, the gas flowing through at least one main catalytic converter (3) is low in oxygen, in particular substantially free of oxygen, wherein, in the un-fired overrun operating phase, that exhaust gas which was produced in the petrol engine (1) during the transition from the normal operating phase to the un-fired overrun operating phase is fed to the petrol engine (1) via an exhaust-gas recirculation line (9) or wherein, in the un-fired overrun operating phase, that exhaust gas which was produced in the petrol engine (1) before or during the transition from the fired overrun operating phase to the un-fired overrun operating phase is fed to the petrol engine (1) via an exhaust-gas recirculation line (9).

Description

Method and gasoline engine arrangement with an improved exhaust gas aftertreatment through a fuel cut-off strategy

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

Preambles of the independent claims.

Different methods for operating a gasoline engine are known from the prior art.

For example, methods are known in which part of the exhaust gas that is produced is mixed in on the intake side via an exhaust gas recirculation system to reduce the fuel consumption or to lower the combustion temperature.

Furthermore, methods are known in which the fuel supply to the gasoline engine is intentionally interrupted by a so-called overrun fuel cutoff when the gasoline engine is not to deliver any power. These processes are mainly used to save fuel and reduce CO 2 emissions in overrun mode - colloquially known as engine brakes.

Especially in these overrun phases or with load gaps, the

Exhaust aftertreatment system flushed with the air pumped through the gasoline engine. As a result, thermal stresses in the

Exhaust aftertreatment components of the exhaust aftertreatment system arise. On the other hand, oxygen can accumulate in the catalytic layers of the exhaust gas aftertreatment components, as a result of which the efficiency of exhaust gas aftertreatment components sensitive to oxygen, in particular the

Efficiency of a 3-way catalyst is impaired. In order to avoid emission peaks, the gasoline engine according to the prior art is first operated under-stoichiometric or rich when the combustion is restarted, as a result of which the oxygen stored in the exhaust gas components can be oxidized. This rich operation of the gasoline engine can result in a brief increase in fuel consumption, which partially counteracts the savings made during the overrun fuel cut-off. This rich operation of the gasoline engine can local and sometimes harmful heat areas in the catalysts and a short-term increase in fuel consumption.

Furthermore, the efficiency of the conventional method is reduced

Exhaust gas aftertreatment system, especially the 3-way catalytic converter, only for a short time if it is flushed with air, for example, in overrun phases.

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 and a gasoline engine arrangement which have a low, in particular relevant to everyday use,

Fuel consumption and the lowest pollutant emissions possible. Furthermore, it is an object of the invention, among other things, to reduce or preferably resolve a possible situational cross-influencing of the target variables mentioned, namely fuel consumption and pollutant emissions. Furthermore, it is an object of the invention to come closer to the so-called vision of “zero impact emission” in order to achieve this

On the one hand, to provide end customers with a gasoline engine arrangement that is economical in terms of fuel consumption and, on the other hand, to protect the environment by preferably 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 method for operating a gasoline engine arrangement in an operating phase, which comprises a normal operating phase and a coasting operating phase, the gasoline engine arrangement comprising a gasoline engine and a

Exhaust gas aftertreatment system comprising at least one main catalyst, fuel and air being converted to exhaust gas in the normal operating phase in the gasoline engine, the gasoline engine being operated and / or regulated in a lambda window preferably by l = 1 in the normal operating phase, the

The overrun phase is formed by at least one unfired overrun phase and / or at least one fired overrun phase, and in the fired overrun 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 one, in particular

sometimes substoichiometric, combustion is.

According to the invention it is provided that the gasoline engine in the unfired

Thrust operating phase that exhaust gas is supplied via an exhaust gas recirculation line that before or during the transition from the normal operating phase to the unfired

Thrust operating phase was generated in the gasoline engine, or that the gasoline is supplied to the gasoline engine in the unfired overrun thrust operating phase via an exhaust gas recirculation line, which before or during the transition from a fired

Thrust operation phase was generated in the unfired overrun operation phase in the gasoline engine. Exhaust gas is therefore recirculated via the exhaust gas recirculation line, so that in particular the main catalytic converter is kept in a predetermined window. In particular, as during the entire unfired overrun operating phase, oxygen-free exhaust gas is recirculated via the exhaust gas recirculation line. This continues until the gasoline engine burns again and thus emits oxygen-free exhaust gas. This has the advantage that the main catalytic converter remains in the effective lambda window by l = 1 during the entire process.

The gasoline engine arrangement can be the gasoline engine arrangement

Internal combustion engine, in particular the gasoline engine arrangement

Motor vehicle.

In the normal operating phase, the gasoline engine is preferably operated and / or regulated in a lambda window by l = 1. This means that the gasoline engine may oscillate around a lambda value l of 1.0 and be 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. 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. The exhaust gas aftertreatment components of the gasoline engine arrangement allow a sufficiently high, in particular, under these conditions

best possible raw emissions conversion. It is preferably provided that that in the normal operating phase

Gas flowing through the main catalyst is low in oxygen, in particular essentially oxygen-free.

This means, if necessary, that in the normal operating phase as well as in the overrun operating phases a sufficient, preferably a maximum,

The degree of conversion of the pollutants by the exhaust gas aftertreatment components should be ensured in total. This can be a sufficiently high

Pollutant reduction in or after the overrun phases, in particular in the fired overrun phase, are made possible. In particular, it is provided that the degree of pollutant emission conversion of the

Exhaust aftertreatment system falls below a pollutant emission conversion degree threshold, below which there is no longer a sufficiently high pollutant emission reduction. It may be

provided that the pollutant emission conversion degree threshold is as large as possible, especially in a range as close as possible to 100%.

The exhaust gas aftertreatment system comprises at least one main catalytic converter, in particular a catalytic converter acting as a 3-way catalytic converter. In particular, the exhaust gas generated in the gasoline engine flows through the main catalytic converter

Exhaust aftertreatment system.

In contrast to known solutions, which only one

In the case of a diesel engine arrangement, it is necessary in a gasoline engine arrangement to keep the main catalytic converter, which is in particular a 3-way catalytic converter, as close as possible to l = 1 so that it is effective.

In contrast, diesel catalytic converters work at around l> 1, which is why solutions from diesel exhaust gas aftertreatment cannot be transferred to gasoline engines.

Conventional overrun phases in the gasoline engine usually lead to around l> 1. The method according to the invention takes this contradiction into account, so that a catalytic converter can be operated effectively in a gasoline exhaust gas aftertreatment system. Furthermore, the exhaust gas aftertreatment system may include the main catalytic converter (s) 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, and / or one or more heating catalytic converter (s) and / or one or more gas engine particle filters and / or one or more NOx storage catalytic converter (s) and / or one or more, in particular coated / gaseous exhaust gas aftertreatment

Exhaust aftertreatment component (s), 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, and / or comprise a secondary air injection.

Furthermore, the exhaust gas aftertreatment system can be composed of the fluff catalytic converter (s) 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, and / or one or more meat catalyst and / or one, in particular one or more gaseous exhaust gas aftertreatment, gasoline engine particle filter and / or one or more NOx storage catalyst / s and / or one or more exhaust gas treatment component / s, which comprises a NOx storage catalyst 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.

In the operating phase, which includes the normal operating phase and the overrun operating phase, the gasoline engine arrangement is in operation. In the normal operating phase, fuel and air can be introduced into the combustion chambers of the cylinders of the gasoline engine and converted to exhaust gas by combustion.

In the overrun phase, the gasoline engine can be towed by the swinging mass of the internal combustion engine. This overrun phase can comprise at least one unfired overrun operating phase and / or at least one fired overrun operating phase.

In the unfired overrun phase, the fuel supply to the gasoline engine is usually interrupted and air is pumped through the gasoline engine. This air pumped by the gasoline engine flows through the exhaust gas aftertreatment system, which on the one hand can reduce fuel consumption, on the other hand the main catalytic converter can be reduced for a short time as a result of the unfired overrun operating phase

Show conversion rate, because, among other things, its oxygen storage is filled.

In the fired overrun phase, the fuel supply to the gasoline engine is only reduced and, for example, only the amount of fuel that is required to convert the amount of oxygen introduced by the air into a low-oxygen, in particular essentially oxygen-free, exhaust gas is introduced into the combustion chambers of the gasoline engine. In particular, in the fired overrun phase, stoichiometric or substoichiometric combustion takes place in the combustion chambers of the gasoline engine. On the one hand, this can prevent and / or reduce the negative effects of oxygen flooding on the oxygen-sensitive exhaust gas aftertreatment components of the exhaust gas aftertreatment system, on the other hand, fuel is also consumed in overrun mode and CO2 is emitted as a result.

The conflict of objectives mentioned above between a low, in particular everyday customer-relevant, average fuel consumption and the lowest

In order to solve pollutant emissions and to reduce or preferably to dissolve a possible cross-influencing of the above-mentioned target values, the gasoline engine according to the invention is supplied with the low-oxygen, essentially oxygen-free, exhaust gas generated before or during the transition to the unfired overrun operating phase. The low-oxygen, essentially oxygen-free, exhaust gas can be in the normal operating phase or in the fired

Overrun phase. In particular, the low-oxygen, generated before or during the transition to the unfired overrun operating phase

Essentially oxygen-free, exhaust gas during the unfired overrun phase pumped in a circle by the cylinders of the gasoline engine driven by the crankshaft.

That means preferably that the generated low oxygen, essentially

Oxygen-free, exhaust gas in the unfired overrun operating phase flows through the gasoline engine and then, if appropriate, the exhaust gas aftertreatment system, in particular the main catalytic converter, and is then fed back to the gasoline engine through the exhaust gas recirculation line.

By operating the gasoline engine in an unfired overrun phase, in which, however, the oxygen-poor, essentially oxygen-free, exhaust gas is circulated, it may be possible to reduce both the fuel consumption and the

Reduce pollutant emissions. In particular, this makes it possible to consume essentially no fuel in the unfired overrun operating phase and still use the oxygen content in the main catalytic converter

Keep exhaust aftertreatment system low.

It is thus possible with the method according to the invention to solve the conflict of objectives mentioned above.

Within the scope of the present invention, at least one of them is included

Main catalytic converter or the main catalytic converter to be understood to mean 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 is optionally provided that the method is automated, in particular in a control unit of a motor vehicle and / or by a control unit of a

Motor vehicle, controlled and / or regulated is executed.

If necessary, provision is made for the fuel supply to be or to be stopped in the unfired overrun operating phase.

This makes it possible to reduce fuel consumption in the unfired

Substantially reduce the overrun phase to zero.

It is optionally provided that the exhaust gas of the gasoline engine is fed to the main catalytic converter in the normal operating phase and / or in the fired overrun mode, and that this main catalytic converter is designed or acts as a 3-way catalytic converter.

In particular, it can be provided that in the normal operating phase and / or in the fired overrun operating phase, the exhaust gas of the gasoline engine generated by the combustion of fuel is the exhaust gas aftertreatment system, in particular the

Main catalyst, flows through and then released into the environment and / or enters the exhaust gas recirculation line.

It is optionally provided that the oxygen content of the in the

Exhaust gas aftertreatment system or that the oxygen content of the exhaust gas flowing through the exhaust gas aftertreatment system in the

Overrun phase, especially in the unfired overrun phase, essentially the oxygen content of the exhaust gas aftertreatment system

flowing exhaust gas in the normal operating phase or in the fired

Overrun phase corresponds.

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

This means that, if necessary, that before or during the transition to the unfired overrun operating phase in the normal operating phase or in the fired one

Thrust operation phase, exhaust gas generated by the combustion of the fuel in the combustion chambers of the cylinders of the gasoline engine is circulated in the unfired overrun operation phase.

In particular, the exhaust gas supplied to the gasoline engine in the unfired overrun operating phase first flows through the exhaust gas recirculation line, then through the gasoline engine and then, if appropriate, through the exhaust gas aftertreatment system, in particular the

Main catalyst. The exhaust gas can be pumped in a circle as long as the unfired overrun operating phase continues. This means that, if necessary, the exhaust gas can be pumped several times or continuously through the exhaust gas recirculation line, the gasoline engine and, if appropriate, the exhaust gas aftertreatment system, in particular the main catalytic converter.

In one embodiment it is provided that the exhaust gas generated before or during the transition to the unfired overrun operating phase is introduced into the gasoline engine via the exhaust gas recirculation line and then back into the exhaust gas recirculation line for supplying the generated exhaust gas to the gasoline engine.

In one embodiment it is provided that the exhaust gas generated before or during the transition to the unfired overrun operating phase is introduced via the exhaust gas recirculation line into the gasoline engine, then into the exhaust gas aftertreatment system, in particular the main catalytic converter, and then again into the exhaust gas recirculation line for supplying the generated exhaust gas to the gasoline engine .

It is optionally provided that the oxygen content of the exhaust gas located in the main catalytic converter in the normal operating phase and / or in the coasting operating phase, in particular in the unfired coasting operating phase, is less than 5% by volume or essentially zero, or that the oxygen content of the in the main catalytic converter and at least one further catalytic converter of the exhaust gas aftertreatment system in the normal operating phase and / or in the overrun operating phase,

in particular in the unfired overrun phase, is less than 5% by volume or essentially zero, or that the oxygen content of the exhaust gas in the main catalytic converter and all other catalysts of the exhaust gas aftertreatment system is in the normal operating phase and / or in the overrun phase, in particular in the unfired overrun phase, is less than 5% by volume or substantially zero.

If appropriate, it is provided that the oxygen content of the exhaust gas flowing through the main catalyst in the normal operating phase and / or in the

Thrust operation phase, in particular in the unfired overrun operation phase, is less than 5% by volume or essentially zero.

If appropriate, it is provided that the oxygen content of the exhaust gas flowing through the main catalyst and at least one further catalyst of the exhaust gas aftertreatment system in the normal operating phase and / or in the

If appropriate, it is provided that the oxygen content of the exhaust gas flowing through the main catalyst and all further catalysts of the exhaust gas aftertreatment system in the normal operating phase and / or in the overrun operating phase,

in particular in the unfired overrun operating phase, is less than 5% by volume or essentially zero.

In particular, it is provided that the oxygen content of the

Normal operating phase and the fired overrun operating phase generated exhaust gas is low and in particular is below 5 percent by volume.

It is optionally provided that the amount of oxygen of the exhaust gas flowing through the main catalyst in the unfired overrun operating phase is less than or equal to the oxygen storage capacity of the main catalyst, or that the oxygen flowing through the main catalyst and at least one further catalyst of the exhaust gas aftertreatment system in the unfired overrun operating phase The amount of oxygen in the exhaust gas is less than or equal to the oxygen storage capacity of the main catalytic converter and the at least one further catalytic converter, or that the main catalytic converter and all others are in the unfired overrun mode

The amount of oxygen flowing through the catalysts of the exhaust gas aftertreatment system is less than or equal to the oxygen storage capacity of the main catalyst and all other catalysts.

It may be provided that the amount of oxygen in the exhaust gas in the main catalytic converter in the unfired overrun mode is less than or equal to the oxygen storage capacity of the main catalytic converter.

If necessary, it is provided that in the unfired overrun operating phase in the main catalytic converter and at least one further catalytic converter

Exhaust gas aftertreatment system located oxygen amount of the exhaust gas is less than or equal to the oxygen storage capacity of the main catalyst and the at least one further catalyst.

If appropriate, it is provided that the in the unfired overrun operating phase in the main catalyst and all other catalysts

Exhaust gas aftertreatment system located oxygen amount of the exhaust gas less than or equal to the oxygen storage capacity of the main catalyst and all others

Is catalysts.

In particular, it is provided that the oxygen content of the

Exhaust gas aftertreatment system, in particular the exhaust gas flowing through the main catalyst, is kept so low during the unfired overrun operating phase that the oxygen content within the scope of the oxygen storage capacity of the

Exhaust aftertreatment components of the exhaust aftertreatment system,

especially in the context of the oxygen storage capacity of the main catalyst remains.

As a result, it may be possible that the efficiency of the main catalytic converter or the main catalytic converters, which in particular act as 3-way catalytic converters, is or are essentially unaffected during the overrun phase. Especially the 3-way catalytic converter and possibly all other exhaust gas components, which act in particular as a 3-way catalytic converter, can be kept in the best possible condition for converting the pollutant components, so that the efficiency is kept at the greatest possible level at all times. This makes it possible to compare to conventional ones

Otto engine arrangements also the efficiency of the transient processes

To improve the exhaust gas aftertreatment system in order to come closer to the so-called vision of "Zero Impact Emission". In particular, it is provided that at no time does the degree of pollutant emission conversion of the exhaust gas aftertreatment system fall below a threshold value for pollutant emission conversion, below which there is no longer a sufficiently high reduction in pollutant emissions.

If appropriate, it is provided that the amount of oxygen of the exhaust gas flowing through the main catalytic converter in the unfired overrun operating phase is kept so low that the efficiency of the main catalytic converter, in particular the main catalytic converter acting as a 3-way catalytic converter, is unaffected, or that in the unfired overrun operating phase the main catalytic converter and at least one further catalyst flowing through the exhaust gas aftertreatment system

The amount of oxygen in the exhaust gas is kept so low that the efficiency of the main catalyst, in particular that of the 3-way catalyst

Main catalytic converter, and the at least one further catalytic converter is unaffected, so that in particular the overall efficiency of the exhaust gas aftertreatment system consisting of several elements is largely unaffected, or that the amount of oxygen in the exhaust gas flowing through the main catalyst and all other catalysts of the exhaust gas aftertreatment system in the unfired overrun mode is kept so low that the efficiency of the main catalytic converter, in particular the main catalytic converter acting as a 3-way catalytic converter, and all other catalytic converters is unaffected, so that the overall efficiency of the exhaust gas aftertreatment system consisting of several elements is largely unaffected. It is optionally provided that the amount of oxygen in the exhaust gas in the main catalytic converter in the unfired overrun operating phase is kept so low that the efficiency of the main catalytic converter, in particular the main catalytic converter acting as a 3-way catalytic converter, is unaffected.

Exhaust gas aftertreatment system located oxygen quantity of the exhaust gas is kept so low that the efficiency of the main catalyst, in particular the main catalyst acting as a 3-way catalyst, and the at least one other catalyst is unaffected.

Exhaust gas aftertreatment system oxygen quantity of the exhaust gas is kept so low that the efficiency of the main catalyst, in particular the main catalyst acting as a 3-way catalyst, and all other catalysts is unaffected.

In particular, it is provided that the oxygen content of the

Exhaust gas aftertreatment system, in particular the exhaust gas flowing through the main catalytic converter, is kept so low during the unfired overrun operating phase that no active strategy for emptying the oxygen store has to follow in order to enable sufficient efficiency, in particular 3-way conversion capability.

If appropriate, it is provided that the amount of oxygen of the exhaust gas flowing through the main catalyst in the unfired overrun operating phase is kept so low that the transition from the overrun operating phase to the

Fat operation of the gasoline engine taking place during the normal operating phase, the mode of operation of the main catalytic converter, in particular that of the 3-way catalytic converter

Main catalyst, is manufactured, or that in the unfired

Overrun phase of the main catalytic converter and at least one further catalytic converter in the exhaust gas aftertreatment system is kept low that the operation of the main catalytic converter, in particular the one acting as a 3-way catalytic converter, takes place due to the rich operation of the gasoline engine occurring during the transition from the overrun phase to the normal operating phase

Main catalyst, and the at least one further catalyst is produced, or that in the unfired overrun operating phase flowing through the main catalyst and all other catalysts of the exhaust gas aftertreatment system

The amount of oxygen in the exhaust gas is kept so low that the operation of the main catalytic converter, in particular the main catalytic converter acting as a 3-way catalytic converter, and all other catalytic converters is produced by the rich operation of the gasoline engine taking place during the transition from the overrun phase to the normal operating phase.

If necessary, it is provided that the amount of oxygen in the exhaust gas in the main catalytic converter in the unfired overrun operating phase is kept so low that the transition from the overrun operating phase to the

Main catalyst is produced.

Exhaust gas aftertreatment system oxygen quantity of the exhaust gas is kept so low that the operation of the main catalytic converter, in particular that acting as a 3-way catalytic converter, takes place due to the rich operation of the gasoline engine occurring during the transition from the overrun mode to the normal operating phase

Main catalyst, and the at least one further catalyst is produced.

Exhaust gas aftertreatment system located oxygen quantity of the exhaust gas is kept so low that by the transition from the overrun phase in

Main catalyst, and all other catalysts is produced. In particular, it is provided that the oxygen content of the

Exhaust gas treatment system, in particular the exhaust gas flowing through the main catalytic converter, is kept so low during the unfired overrun operating phase that a reuse strategy with at least one short substoichiometric combustion phase is sufficient to restore or ensure the 3-way conversion capability.

If necessary, it is envisaged that the transition to the unfired

Overrun phase the air supply to the gasoline engine is or is stopped, the stopping of the air supply to the gasoline engine in particular by closing one of the

Throttle valve upstream of the gasoline engine.

The air supply to the gasoline engine can be stopped by closing the throttle valve. This may make it possible in the unfired overrun mode by moving the cylinders before or during the transition to the unfired one

Exhaust generated exhaust gas to suck in via the exhaust gas recirculation line. This suction can do this before or during the transition to the unfired

Exhaust gas generated during the overrun operation phase is circulated or pumped during the unfired overrun operation phase.

If necessary, it is envisaged that the transition to the unfired

Overrun operating phase, the exhaust gas recirculation line is or remains open,

the opening of the exhaust gas recirculation line in particular by opening a

Exhaust gas recirculation valve takes place.

Through the exhaust gas recirculation line, the exhaust gas generated before or during the transition to the unfired overrun operating phase is discharged to the gasoline engine in the unfired one

Overrun phase. It can be provided that the

Exhaust gas recirculation line in the normal operating phase and in the fired

Overrun phase is closed. If necessary, it is provided that only the exhaust gas that was generated before or during the transition from the normal operating phase to the unfired overrun operating phase in the gasoline engine is supplied to the gasoline engine in the unfired overrun operating phase, or that

In the unfired overrun operating phase, the gasoline engine is supplied exclusively with the exhaust gas via an exhaust gas recirculation line that was generated in the petrol engine before or during the transition from the fired overrun operating phase to the unfired overrun operating phase.

If appropriate, it is provided that the gasoline is supplied to the gasoline engine in the entire unfired overrun operating phase via an exhaust gas recirculation line, which is before or during the transition from the normal operating phase to the unfired one

Thrust operation phase or that was generated in the gasoline engine before or during the transition from the fired overrun operation phase to the unfired overrun operation phase.

It is optionally provided that the gas conveyed by the gasoline engine in the unfired overrun operating phase has an oxygen content of less than 5% by volume or essentially zero, and / or that in the unfired

The overrun phase of the exhaust gas flowing through the gasoline engine is less than or equal to the oxygen storage capacity of the main catalytic converter, at least one further catalytic converter of the exhaust gas aftertreatment system and / or all

Is catalysts of the exhaust gas aftertreatment system, and / or that the oxygen quantity of the exhaust gas flowing through the gasoline engine in the unfired overrun operating phase is kept so low that the efficiency of the main catalyst, in particular the main catalyst acting as a 3-way catalyst, at least one further catalyst of the exhaust gas aftertreatment system and / or all

Catalysts of the exhaust gas aftertreatment system is unaffected, and / or that the gasoline engine flowing through in the unfired overrun operating phase

The amount of oxygen in the exhaust gas is kept so low that the operation of the main catalytic converter, in particular the main catalytic converter acting as a 3-way catalytic converter, of at least one further catalytic converter takes place due to the rich operation of the gasoline engine taking place during the transition from the overrun phase to the normal operating phase Exhaust aftertreatment system and / or all of the catalysts

Exhaust aftertreatment system is manufactured.

If appropriate, it is provided that the gasoline engine arrangement comprises a high-pressure EGR system with a high-pressure EGR line, and that the exhaust gas supplied to the gasoline engine in the unfired overrun operating phase is returned to the gasoline engine through the high-pressure EGR line.

The exhaust gas recirculation line may be designed as a high-pressure EGR line.

If appropriate, it is provided that the exhaust gas supplied to the gasoline engine exits the high-pressure EGR line before the gasoline engine, and that the exhaust gas supplied to the gasoline engine enters the high-pressure EGR line between the gasoline engine and a turbine of a turbocharger of the gasoline engine.

This means that, if necessary, in the unfired overrun phase of the

Gasoline engine the exhaust gas generated before or during the transition to the unfired overrun operating phase is fed to the gasoline engine via a high-pressure EGR line. As a result, the exhaust gas generated can enter the high-pressure EGR line between the gasoline engine and a turbine of the turbocharger and exit the high-pressure EGR line in front of the gasoline engine.

In this case, the exhaust gas generated can only be used in the unfired overrun mode

Flow through the gasoline engine. If necessary, it is provided that in the unfired overrun operation phase before or during the transition to the unfired

Thrust operating phase in the exhaust gas aftertreatment system, essentially oxygen-free, exhaust gas remains, even during the unfired overrun operating phase in the exhaust gas aftertreatment system, in particular in the main catalytic converter.

Within the scope of the present invention, the exhaust gas generated before or during the transition to the unfired overrun operating phase, that is to say in the normal operating phase or in the fired overrun operating phase, can be produced by the exhaust gas generated Combustion of fuel in the gasoline engine can be understood as low-oxygen, in particular essentially oxygen-free, exhaust gas.

If appropriate, it is provided that the gasoline engine arrangement comprises a bypass line and that the exhaust gas supplied to the gasoline engine in the unfired overrun operating phase is returned to the gasoline engine through the bypass line.

The exhaust gas recirculation line may be designed as a bypass line.

If appropriate, it is provided that the exhaust gas supplied to the gasoline engine exits the bypass line before the gasoline engine, the exhaust gas supplied to the gasoline engine entering the bypass line between the gasoline engine and a turbine of a turbocharger of the gasoline engine, or wherein the exhaust gas supplied to the gasoline engine between the main catalyst and another catalyst, especially one

Oxidation catalytic converter that enters the bypass line,

or wherein the exhaust gas supplied to the gasoline engine between the main catalytic converter or an oxidation catalytic converter and a further catalytic converter

Exhaust gas aftertreatment system enters the bypass line, or the exhaust gas supplied to the gasoline engine after the last catalytic converter

Exhaust aftertreatment system enters the bypass line.

In the unfired overrun operation phase, the exhaust gas generated before or during the transition to the unfired overrun operation phase can be removed via the bypass line

Otto engine and then preferably the exhaust gas aftertreatment system are supplied.

Depending on the embodiment, the generated exhaust gas can enter the bypass line directly after the gasoline engine or after an exhaust aftertreatment component of the exhaust aftertreatment system in the unfired overrun operating phase. This can influence which components of the gasoline engine arrangement, that is to say which exhaust gas aftertreatment components in addition to the gasoline engine, are flowed through with the substantially oxygen-free exhaust gas generated in the unfired overrun operating phase. If appropriate, it is provided that the gasoline engine arrangement comprises a low-pressure EGR system with a low-pressure EGR line, and that the exhaust gas supplied to the gasoline engine in the unfired overrun mode is returned to the gasoline engine through the low-pressure EGR line.

The exhaust gas recirculation line may be designed as a low-pressure EGR line.

If appropriate, it is provided that the exhaust gas supplied to the gasoline engine exits the low-pressure EGR line before the gasoline engine, the exhaust gas supplied to the gasoline engine entering the low-pressure EGR line between a turbine of a turbocharger of the gasoline engine and the main catalytic converter, or wherein this the

Exhaust gas supplied to the gasoline engine between the main catalytic converter and a further catalytic converter, in particular an oxidation catalytic converter, enters the low-pressure EGR line, or the exhaust gas supplied to the gasoline engine between the

Main catalytic converter or an oxidation catalytic converter and another catalytic converter of the exhaust gas aftertreatment system enters the low-pressure EGR line,

or wherein the exhaust gas supplied to the gasoline engine enters the low-pressure EGR line after the last catalytic converter of the exhaust gas aftertreatment system.

In the unfired overrun operating phase, the exhaust gas generated before or during the transition to the unfired overrun operating phase can be fed to the gasoline engine and then preferably to the exhaust gas aftertreatment system via the low-pressure EGR line.

Depending on the embodiment, the exhaust gas generated can enter the low-pressure EGR line directly after the gasoline engine or after an exhaust gas aftertreatment component of the exhaust gas aftertreatment system in the unfired overrun mode. This can influence which components of the gasoline engine arrangement, that is to say which exhaust gas aftertreatment components in addition to the gasoline engine, are flowed through by the generated exhaust gas in the unfired overrun mode.

It may be provided that the exhaust gas aftertreatment system contains the main catalytic converter (s) and possibly one or more precatalysts and / or one or more secondary catalyst (s), in particular one or more oxidation catalyst (s), which have an oxidation catalyst coating

comprises / 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 filters and / or one or more NOx storage catalytic converter (s) and / or one or more exhaust gas aftertreatment component (s), 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, and / or comprise a secondary air injection or that the exhaust gas aftertreatment system from / the Main catalytic converter (s) and optionally one or more precatalyst (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 (s) and / or one or more heating catalytic converter (s) and / or one or more, in particular one or more gaseous exhaust gas aftertreatment effective attached,

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 a plurality of exhaust gas aftertreatment components which comprise an SCR coating and / or a secondary air injection.

If necessary, it is provided that the exhaust gas generated in the normal operating phase or in the fired overrun operating phase by the combustion of fuel in the gasoline engine first the main catalytic converter, then the optionally provided oxidation catalytic converter, which includes an oxidation catalytic converter coating, the optionally provided gasoline engine particle filter, the optionally

provided SCR catalyst and then flows through the optional NOx storage catalyst.

If appropriate, it is provided that the exhaust gas aftertreatment system has at least one main catalytic converter designed as a 3-way catalytic converter and / or acting as a 3-way catalytic converter, a gasoline engine particle filter and / or a NOx Storage catalytic converter comprises, where appropriate the main catalytic converter is arranged 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 at least one designed as a 3-way catalytic converter and / or acting as a 3-way catalytic converter

Main catalytic converter, is formed from a gasoline engine particle filter and / or from a 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 upstream of the NOx storage catalytic converter.

If appropriate, it is provided that the exhaust gas aftertreatment system has at least one main catalyst and one downstream of the main catalyst that can be regenerated using oxygen and / or nitrogen dioxide

Gasoline engine particle filter includes that the exhaust gas aftertreatment system includes a feed line leading into the exhaust gas aftertreatment system, that in a regeneration operation via one or the feed line leading into the exhaust gas aftertreatment system upstream of the gasoline engine particle filter and oxygen

in particular air, preferably filtered ambient air, is supplied for the regeneration of the gasoline engine particle filter, the oxygen content of the

Exhaust gas flowing through the main catalytic converter or the exhaust gas located in the main catalytic converter in the regeneration mode is less than 5% by volume or essentially zero, and / or the oxygen quantity of the exhaust gas flowing through the main catalytic converter in the regeneration mode or the amount of oxygen in the main catalytic converter is kept as low as possible that the efficiency of the

Main catalyst is unaffected

If appropriate, it is provided that the exhaust gas aftertreatment system comprises a NOx storage catalytic converter arranged downstream of the main catalytic converter and / or possibly the gasoline particle filter, that the exhaust gas aftertreatment system includes a feed line leading into the exhaust gas aftertreatment system, that during storage operation of the NOx storage catalytic converter the NOx storage catalytic converter via the into the exhaust gas aftertreatment system opening supply line oxygen and in particular air, preferably filtered and / or compressed ambient air, is fed that optionally an oxidation catalyst between the Main catalytic converter and the NOx storage catalytic converter is provided, and in that the oxidation catalytic converter comprises an oxidation catalytic converter coating, the oxygen content of the exhaust gas flowing through the main catalytic converter or of the exhaust gas located in the main catalytic converter in storage operation being less than 5% by volume or essentially zero, and / or wherein the amount of oxygen of the exhaust gas flowing through the main catalytic converter in the storage mode or the amount of oxygen of the exhaust gas located in the main catalytic converter is kept so low that the efficiency of the main catalytic converter is unaffected.

If appropriate, it is 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 optionally arranged upstream of the NOx storage catalytic converter, that the SCR catalytic converter is used to reduce the SCR catalytic converter Reduction of the nitrogen oxides via one or the supply line opening into the exhaust gas aftertreatment system, 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 in the reduction mode being less than 5% by volume or in

Is substantially zero, and / or wherein in the reduction mode

Main amount of oxygen flowing through the main catalyst of the exhaust gas is kept so low that the efficiency of the main catalyst is unaffected.

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 and / or a further 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 and / or a further catalytic converter have oxygen, in particular via a separate supply line

Ambient air is supplied. Where appropriate, it is provided that a fuel, in particular 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 fuel containing a reducing agent for nitrogen oxide reduction or being convertible into a reducing agent for nitrogen oxide reduction, and / or that a

Reducing agents for nitrogen oxide reduction, in particular ammonia NH3, are generated by the main catalytic converter, in particular by the 3-way catalytic converter, in the course of normal gasoline engine operation and / or by, if appropriate, temporarily adjusting the gasoline engine operating parameters of the gasoline engine, in particular by operating the gasoline engine under substoichiometric

In particular, the invention relates to a gasoline engine arrangement, wherein the

Gasoline engine assembly includes a gasoline engine and an exhaust gas aftertreatment system with at least one main catalyst, the gasoline engine in one

Operating phase, which comprises a normal operating phase and a coasting operating phase, can be operated, the gasoline engine converting fuel and air to an exhaust gas in the normal operating phase, the gasoline engine being operated and / or regulated in a lambda window preferably by l = 1 in the normal operating phase, the

Overrun phase is formed by at least one unfired overrun phase and / or at least one fired overrun phase, and in which

fired overrun phase, the gas flowing through the main catalytic converter is low in oxygen, in particular essentially oxygen-free, and in particular the exhaust gas of a stoichiometric or sub-stoichiometric one, in particular

phased sub-stoichiometric combustion, characterized in that an exhaust gas recirculation line is provided which supplies the gasoline engine with the exhaust gas generated before or during the transition from the normal operating phase to the unfired overrun control phase in the gasoline engine in an unfired overrun operation phase, or that an exhaust gas recirculation line is provided which Otto engine in an unfired overrun phase before or during the transition from the fired

Thrust operation phase feeds exhaust gas generated in the gasoline engine into the unfired overrun operation phase. If necessary, provision is made for the fuel supply to be stopped in the unfired overrun mode.

If necessary, it is provided that the overrun operation phase is fired by at least one unfired overrun operation phase and / or at least one

Thrust operation phase is formed, and that the gas flowing through the main catalytic converter in the fired overrun operation phase is essentially oxygen-free and in particular the exhaust gas of a stoichiometric or sub-stoichiometric

Combustion is.

If appropriate, provision is made for air, in particular oxygen, to be supplied to a NOx storage catalytic converter of the exhaust gas aftertreatment system in the normal operating phase via the exhaust gas recirculation line, as a result of which the NOx storage catalytic converter can be operated within its regular storage mode.

If appropriate, it is provided that the gasoline engine arrangement is set up to carry out the method according to the invention.

It is optionally provided that between the main catalytic converter and one or the gasoline engine particle filter with an oxidation catalytic converter coating

Coated oxidation catalyst is provided, or that one or

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 O2 to NO2.

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 region 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 in front of 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 in front of a NOx storage catalytic converter, in particular in the front area of the NOx storage catalytic converter, 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 has a gasoline engine and an exhaust gas aftertreatment system with at least the main catalytic converter, the

Gasoline engine particulate filter and a NOx storage catalyst that the

Main catalyst is designed as a 3-way catalyst or acts that

Main catalytic converter of the gasoline engine particle filter, which optionally acts as a 4-way catalytic converter, is arranged downstream that the gasoline engine particle filter is followed by the NOx storage catalytic converter, and if necessary one or more

Oxidation catalyst is arranged in front of the NOx storage catalyst.

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.

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 shows a schematic graphic representation of a first embodiment of a gasoline engine arrangement according to the invention,

2a, 2b and 2c show schematic graphic representations of different variations of a second embodiment of an inventive

Otto engine arrangement, and 3a, 3b and 3c show schematic graphic representations of different variations of a third embodiment of an inventive

Gasoline engine arrangement.

Unless otherwise stated, the reference symbols correspond to the following

Components:

Gasoline engine 1, exhaust gas aftertreatment system 2, main catalytic converter 3, another exhaust gas aftertreatment component 4, turbocharger 5, throttle valve 6, compressor 7, turbine 8 and exhaust gas recirculation line 9.

The further exhaust gas aftertreatment component (s) 4 may optionally comprise a 3-way catalytic converter and / or a 4-way catalytic converter and / or a NOx storage catalytic converter or a 3-way catalytic converter and / or a 4-way catalytic converter and / or a NOx storage catalytic converter.

In particular, it is provided that the exhaust gas aftertreatment system 2 has a

Main catalyst 3 and a 4-way catalyst includes.

Main catalyst 3, an oxidation catalyst and a 4-way catalyst includes.

Main catalyst 3, an oxidation catalyst, a 4-way catalyst and a NOx storage catalyst.

Main catalyst 3, a 4-way catalyst and a NOx storage catalyst.

1 shows a schematic graphic representation 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 and a subordinate to the main catalytic converter 3

Exhaust aftertreatment component 4. In this embodiment, the

The main catalytic converter 3 is designed as a 3-way catalytic converter and is arranged directly after the turbine 8 of the turbocharger 5, in particular close to the engine. The further exhaust gas aftertreatment component 4 is in an embodiment variant of the first embodiment of the gasoline engine arrangement according to the invention

Petrol engine particle filter and in another variant of the first

Embodiment of the gasoline engine arrangement according to the invention designed as a 4-way catalyst.

Furthermore, the gasoline engine arrangement comprises a turbocharger 5 and a throttle valve 6. The turbocharger 5 comprises a compressor 7 and a turbine 8.

The gasoline engine arrangement is operated in an operating phase, which is a

Normal operating phase and an overrun phase includes. In the

Normal operating phase 1 fuel is supplied to the gasoline engine. In the normal operating phase, the fuel is converted with air to an exhaust gas. In the

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 oscillates 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.

In the overrun phase, the gasoline engine 1 is dragged by the mass in motion. The overrun phase comprises at least one unfired and / or at least one fired overrun phase.

In the fired overrun phase, the fuel supply to the gasoline engine 1 is only reduced and only that amount of fuel into the combustion chambers of the gasoline engine 1 introduced, which is required to convert the amount of oxygen introduced by the air into a substantially oxygen-free exhaust gas. In particular, in the fired overrun phase, stoichiometric or substoichiometric combustion takes place in the combustion chambers of the gasoline engine 1.

That in the normal operating phase and in the fired overrun operating phase in

Exhaust gas generated by gasoline engine 1 first flows through the turbine 8 of the turbocharger 5, then through the main catalytic converter 3 and then through the further catalytic converter

Exhaust aftertreatment component 4 before it escapes into the environment.

In the unfired overrun mode, the fuel supply to the gasoline engine 1 is interrupted. In contrast to conventional methods, in which air is pumped through the gasoline engine 1 in the unfired overrun operating phase, according to this embodiment the exhaust gas generated before or during the transition to the unfired overrun operating phase is pumped in a circuit. This means that the exhaust gas generated before or during the transition to the unfired overrun operating phase enters the exhaust gas recirculation line 9 after the gasoline engine 1 and before the gasoline engine 1,

in particular on the intake side, exits the exhaust gas recirculation line 9. Furthermore, the essentially oxygen-free exhaust gas remains during the unfired one

Thrust operation phase in the exhaust gas aftertreatment system 2, in particular in the main catalytic converter 3 and in the further exhaust gas aftertreatment component 4.

The essentially oxygen-free exhaust gas was generated in the normal operating phase or in the fired overrun operating phase. In particular, the substantially oxygen-free exhaust gas generated before or during the transition to the unfired overrun operating phase is pumped in a circle by the cylinders of the gasoline engine 1 driven by the crankshaft during the unfired overrun operating phase.

As a result, the oxygen content of the exhaust gas located in the exhaust gas aftertreatment system 2, in particular in the main catalytic converter 3, essentially corresponds to the oxygen content of the engine during the unfired overrun mode

Exhaust gas which flows through the exhaust gas aftertreatment system 2 in the normal operating phase or in the fired overrun operating phase. In contrast to Conventional methods, the exhaust gas aftertreatment system 2 is not flowed through and / or flooded with oxygen-containing exhaust gas during the unfired overrun operating phase.

According to this embodiment, the exhaust gas recirculation line 9 is designed as a high-pressure EGR line of a high-pressure EGR system of the gasoline engine arrangement.

At the transition to the unfired overrun mode, the air supply becomes

Gasoline engine 1 stopped by closing the throttle valve 6. Furthermore, the exhaust gas recirculation line 9 remains or is opened by opening the exhaust gas recirculation valve.

The petrol engine 1 is thus during the unfired overrun phase

only the exhaust gas generated before or during the transition to the unfired overrun operating phase.

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, this can result in the conventional method

Introduction of air, the so-called air flooding, the exhaust gas aftertreatment system 2 in the event of load gaps or thrust with negative consequences for the function of the

Exhaust gas cleaning and the thermomechanical stress of the

Exhaust gas aftertreatment system 2 can be avoided and / or reduced. It is preferably provided that the throttle valve 6 is completely closed or kept closed in the unfired overrun operating phase and that the suction and

Open exhaust gas recirculation line 9 connecting the exhaust gas engine 1 or keep it open. This leaves even with dynamic engine operation

comparatively hot engine exhaust essentially without free oxygen in the

Circulation. This can prevent any storage of oxygen in the main catalytic converter 3 and the further exhaust gas aftertreatment component 4 and the subsequent rich operation of the gasoline engine 1 will. Furthermore, little or no thermal gradients occur in the exhaust gas aftertreatment system 2.

That is, according to the method for operating the gasoline engine arrangement in the unfired overrun operating phase, exhaust gas that was generated before or during the transition from the normal operating phase to the unfired overrun operating phase in the gasoline engine 1 is fed back to the gasoline engine 1. The exhaust gas supplied to the gasoline engine 1 in the unfired overrun operating phase was in the fired one

Overrun or in the normal operating phase by burning the

Fuel is generated with air and is essentially oxygen-free.

Gasoline engine arrangement 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 and 2c can preferably correspond to the features of the embodiments according to FIG.

In contrast to the first embodiment, which is shown in FIG. 1, the exhaust gas recirculation line 9 is designed as a bypass line.

In Fig. 2a, the exhaust gas generated before or during the transition to the unfired overrun operating phase occurs after the gasoline engine 1 in the bypass line and before

Gasoline engine 1 from the bypass line. In this embodiment, the substantially oxygen-free exhaust gas generated before or during the transition to the unfired overrun operating phase thus only flows through the gasoline engine 1 and the bypass line during the unfired overrun operating phase.

In FIG. 2 b, the exhaust gas generated before or during the transition to the unfired overrun operating phase enters the bypass line after the main catalytic converter 3 and exits the bypass line before the gasoline engine 1. In this embodiment, the substantially oxygen-free exhaust gas generated before or during the transition to the unfired overrun operating phase flows through during the unfired overrun operating phase So the gasoline engine 1, the turbine 8 of the turbocharger 5, the main catalyst 3 and the bypass line.

In FIG. 2c, the exhaust gas generated before or during the transition to the unfired overrun operating phase enters the bypass line after the further main catalytic converter 3 and exits the bypass line before the gasoline engine 1. In this embodiment, the substantially oxygen-free exhaust gas generated before or during the transition to the unfired overrun operating phase flows through during the unfired

Thrust operation phase, that is, the gasoline engine 1, the turbine 8 of the turbocharger 5, the main catalytic converter 3 and the further exhaust gas aftertreatment component 4 and the bypass line.

In one embodiment, not shown, the exhaust gas generated before or during the transition to the unfired overrun operating phase enters the bypass line after the last catalytic converter of the exhaust gas aftertreatment system 2 and exits the bypass line before the gasoline engine 1. In this embodiment, the substantially oxygen-free exhaust gas generated before or during the transition to the unfired overrun operating phase thus flows through the exhaust during the unfired overrun operating phase

Otto engine 1, the turbine 8 of the turbocharger 5, all

Exhaust aftertreatment components 4 of the exhaust aftertreatment system 2 and the bypass line.

3a, 3b and 3c show schematic graphic representations of different variations of a third embodiment of an inventive

Gasoline engine arrangement which is suitable and / or set up for carrying out the method according to the invention. The features of the embodiment according to FIGS. 3a, 3b and 3c can preferably correspond to the features of the embodiments according to FIG. 1, FIG. 2a, 2b and / or FIG. 2c.

In contrast to the first embodiment, which is shown in FIG. 1, the exhaust gas recirculation line 9 is designed as a low-pressure EGR line of a low-pressure EGR system of the gasoline engine arrangement. In FIG. 3a, the exhaust gas generated before or during the transition to the unfired overrun operating phase enters the low-pressure EGR line after the turbine 8 of the turbocharger 5 and exits the low-pressure EGR line before the gasoline engine 1. In this

Embodiment therefore flows through the essentially oxygen-free exhaust gas generated before or during the transition to the unfired overrun operating phase during the unfired overrun operating phase only the gasoline engine 1, the turbine 8 of the turbocharger 5 and the low-pressure EGR line.

In FIG. 3b, the exhaust gas generated before or during the transition to the unfired overrun operating phase enters the low-pressure EGR line after the main catalytic converter 3 and exits the low-pressure EGR line before the gasoline engine 1. In this embodiment, the substantially oxygen-free exhaust gas generated before or during the transition to the unfired overrun operating phase flows through during the unfired

Thrust operation phase, the gasoline engine 1, the turbine 8 of the turbocharger 5, the main catalytic converter 3 and the low-pressure EGR line.

In FIG. 3c, the exhaust gas generated before or during the transition to the unfired overrun operating phase enters the low-pressure EGR line after the further exhaust-gas aftertreatment component 4 and exits the low-pressure EGR line before the gasoline engine 1. In this embodiment, the essentially oxygen-free exhaust gas generated before or during the transition to the unfired overrun operating phase thus flows through the gasoline engine 1, the turbine 8 of the turbocharger 5, the main catalytic converter 3, and the like during the unfired overrun operating phase

Exhaust aftertreatment component 4 and the low pressure EGR line.

In an embodiment not shown, the exhaust gas generated before or during the transition to the unfired overrun operating phase occurs after the last one

Exhaust gas aftertreatment component 4 of the exhaust gas aftertreatment system 2 into the low-pressure EGR line and out of the low-pressure EGR line in front of the gasoline engine 1. In this embodiment, the substantially oxygen-free exhaust gas generated before or during the transition to the unfired overrun operating phase thus flows through the gasoline engine 1, the turbine 8 during the unfired overrun operating phase of the turbocharger 5, all exhaust aftertreatment components 4 of the

Exhaust aftertreatment system 2 and the low-pressure EGR line.

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

subsequent claims.

Claims

1. Method for operating a gasoline engine arrangement in an operating phase, which comprises a normal operating phase and an overrun operating phase,

the gasoline engine arrangement comprising a gasoline engine (1) and a

Exhaust gas aftertreatment system (2) with at least one main catalyst (3),

in the normal operating phase in the gasoline engine (1), fuel and air are converted into exhaust gas,

wherein the gasoline engine (1) is operated and / or regulated in a lambda window by l = 1 in the normal operating phase,

wherein the overrun phase by at least one unfired

Overrun phase and / or at least one fired overrun phase is formed,

and in the fired overrun phase the gas flowing through the main catalyst (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,

characterized,

that the gasoline engine (1) in the unfired overrun phase is supplied with that exhaust gas via an exhaust gas recirculation line (9) which is before or during the transition from the normal operating phase to the unfired one

Overrun phase in the gasoline engine (1) was generated,

or that the gasoline engine (1) in the unfired overrun operating phase is supplied with that exhaust gas via an exhaust gas recirculation line (9) that was generated before or during the transition from a fired overrun operating phase to the unfired overrun operating phase in the Otto engine (1).

2. The method according to claim 1, characterized in that the fuel supply is or is stopped in the unfired overrun operating phase.

3. The method according to claim 1 or 2, characterized in that in the normal operating phase and / or in the fired

Overrun phase, the exhaust gas from the gasoline engine (1) is fed to the main catalytic converter (3),

and that the main catalyst (3) is designed or acts as a 3-way catalyst.

4. The method according to any one of the preceding claims, characterized

characterized in that the oxygen content of the in the

Exhaust gas treatment system (2) located exhaust gas or that the

Oxygen content of the exhaust gas flowing through the exhaust gas aftertreatment system (2) in the overrun mode, in particular in the unfired one

Overrun phase, essentially the oxygen content of the

Exhaust gas treatment system (2) flowing exhaust gas in the

Corresponds to normal operating phase or in the fired overrun operating phase.

5. The method according to any one of the preceding claims, characterized

characterized in that the oxygen content of the in the main catalyst (3)

Exhaust gas or that the oxygen content of the exhaust gas flowing through the main catalyst (3) in the unfired overrun operating phase in

Essentially the oxygen content of the main catalyst (3)

flowing exhaust gas in the normal operating phase or in the fired overrun operating phase.

6. The method according to any one of the preceding claims, characterized

featured,

that the oxygen content of the exhaust gas located in the main catalyst (3) or the oxygen content of the exhaust gas flowing through the main catalyst (3) in the normal operating phase and / or in the coasting operating phase, in particular in the unfired coasting operating phase, is less than 5% by volume or essentially zero ,

or that the oxygen content of the main catalytic converter (3) and at least one further catalytic converter of the exhaust gas aftertreatment system (2)

Exhaust gas or the oxygen content of the main catalyst (3) and at least one further catalyst

Exhaust gas aftertreatment system (2) flowing through exhaust gas in the normal operating phase and / or in the overrun operating phase, in particular in the unfired overrun operating phase, is less than 5% by volume or essentially zero,

or that the oxygen content of the exhaust gas present in the main catalyst (3) and in all further catalysts or the oxygen content of the main catalyst (3) and all other catalysts of the

Exhaust gas aftertreatment system (2) flowing through exhaust gas in the normal operating phase and / or in the overrun operating phase, in particular in the unfired overrun operating phase, is less than 5% by volume or essentially zero.

7. The method according to any one of the preceding claims, characterized

featured,

that the amount of oxygen of the exhaust gas flowing through the main catalytic converter (3) in the unfired overrun operating phase is less than or equal to the oxygen storage capacity of the main catalytic converter (3),

or that in the unfired overrun phase the main catalyst (3) and at least one other catalyst

Exhaust gas treatment system (2) flowing oxygen amount of the exhaust gas less than or equal to the oxygen storage capacity of the

Main catalytic converter (3) and the at least one further catalytic converter, or that the amount of oxygen in the exhaust gas flowing through the main catalytic converter (3) and all other catalytic converters of the exhaust gas aftertreatment system (2) in the unfired overrun operating phase is less than or equal to the oxygen storage capacity of the main catalytic converter (3) and all others Is catalysts.

8. The method according to any one of the preceding claims, characterized

featured,

that the amount of oxygen of the exhaust gas flowing through the main catalytic converter (3) in the unfired overrun mode is kept so low that the efficiency of the main catalyst (3), in particular the main catalyst (3) acting as a 3-way catalyst, is unaffected,

Exhaust gas aftertreatment system (2) flowing oxygen amount of the exhaust gas is kept so low that the efficiency of the

Main catalytic converter (3), in particular the main catalytic converter (3) acting as a 3-way catalytic converter, and the at least one further catalytic converter is unaffected, so that in particular the overall efficiency of the exhaust gas aftertreatment system (2) consisting of several elements is largely unaffected,

or that the amount of oxygen of the exhaust gas flowing through the main catalyst (3) and all other catalysts of the exhaust gas aftertreatment system (2) in the unfired overrun operation phase is kept so low that the efficiency of the main catalyst (3), in particular of the main catalyst acting as a 3-way catalyst ( 3), and all other catalysts is unaffected, so that in particular the overall efficiency of the exhaust gas aftertreatment system (2) consisting of several elements is largely unaffected.

9. The method according to any one of the preceding claims, characterized

featured,

that the amount of oxygen flowing through the main catalyst (3) of the exhaust gas in the unfired overrun operating phase is kept so low that by the transition from the overrun operating phase to the

Fat operation of the gasoline engine (1) taking place during the normal operating phase, the mode of operation of the main catalytic converter (3), in particular of the main catalytic converter (3) acting as a 3-way catalytic converter, is produced,

Exhaust gas aftertreatment system (2) flowing through the amount of oxygen of the exhaust gas is kept so low that by the rich operation taking place during the transition from the overrun phase into the normal operating phase the gasoline engine (1) produces the mode of operation of the main catalyst (3), in particular the main catalyst (3) acting as a 3-way catalyst, and the at least one further catalyst,

or that the amount of oxygen of the exhaust gas flowing through the main catalyst (3) and all further catalysts of the exhaust gas aftertreatment system (2) in the unfired overrun operation phase is kept so low that the transition from the overrun operation phase into the

Normal operating phase, rich operation of the gasoline engine (1), the mode of action of the main catalytic converter (3), in particular the main catalytic converter (3) acting as a 3-way catalytic converter, and all other catalytic converters is produced.

10. The method according to any one of the preceding claims, characterized

featured,

that the air supply to the gasoline engine (1) is or is stopped during the transition to the unfired overrun mode,

The air supply to the gasoline engine (1) is stopped in particular by closing a throttle valve (6) upstream of the gasoline engine (1).

11. The method according to any one of the preceding claims, characterized

featured,

that during the transition to the unfired overrun phase

Exhaust gas recirculation line (9) is or remains open,

the exhaust gas recirculation line (9) being opened in particular by opening an exhaust gas recirculation valve.

12. The method according to any one of the preceding claims, characterized

featured,

that the gasoline engine (1) in the unfired overrun mode

only that exhaust gas is supplied via an exhaust gas recirculation line (9) that was generated in the gasoline engine (1) before or during the transition from the normal operating phase to the unfired overrun operating phase, or that the gasoline engine (1) in the unfired overrun operation phase is supplied exclusively with the exhaust gas via an exhaust gas recirculation line (9) that was generated in the gasoline engine (1) before or during the transition from the fired overrun operation phase to the unfired overrun operation phase.

13. The method according to any one of the preceding claims, characterized

characterized that the gasoline engine (1) in the entire unfired

Thrust operating phase that exhaust gas is fed via an exhaust gas recirculation line (9) that before or during the transition from the normal operating phase to the unfired pushing operating phase or before or during the transition from the fired pushing operating phase to the unfired pushing operating phase in

Otto engine (1) was generated.

14. The method according to any one of the preceding claims, characterized

featured,

that the gas conveyed by the gasoline engine (1) in the unfired overrun operating phase has an oxygen content of less than 5% by volume or essentially zero,

and / or that the oxygen quantity of the exhaust gas flowing through the gasoline engine (1) in the unfired overrun operating phase is less than or equal to the oxygen storage capacity of the main catalyst (3), at least one further catalyst of the exhaust gas aftertreatment system (2) and / or all catalysts of the exhaust gas aftertreatment system (2),

and / or that the amount of oxygen of the exhaust gas flowing through the gasoline engine (1) in the unfired overrun operating phase is kept so low that the efficiency of the main catalyst (3), in particular the main catalyst (3) acting as a 3-way catalyst, of at least one further catalyst the exhaust gas aftertreatment system (2) and / or all

Catalysts (3) of the exhaust gas aftertreatment system (2) is unaffected, and / or that the amount of oxygen in the exhaust gas flowing through the gasoline engine (1) in the unfired overrun operating phase is kept so low that the transition from the overrun operating phase into the

Grease operation of the gasoline engine (1) taking place during the normal operating phase Mode of operation of the main catalytic converter (3), in particular of the main catalytic converter (3) acting as a 3-way catalytic converter, at least one further catalytic converter of the exhaust gas aftertreatment system (2) and / or all

Catalysts (3) of the exhaust gas aftertreatment system (2) is produced.

15. The method according to any one of the preceding claims, characterized

featured,

that the gasoline engine arrangement comprises a high-pressure EGR system with a high-pressure EGR line,

and that the exhaust gas supplied to the gasoline engine (1) in the unfired overrun operating phase is returned to the gasoline engine (1) through the high-pressure EGR line.

16. The method according to claim 15, characterized in

that the exhaust gas supplied to the gasoline engine (1) exits the high-pressure EGR line before the gasoline engine (1),

and that the exhaust gas supplied to the gasoline engine (1) enters the high-pressure EGR line between the gasoline engine (1) and a turbine (8) of a turbocharger (5) of the gasoline engine (1).

17. The method according to any one of the preceding claims, characterized

featured,

that the gasoline engine arrangement comprises a bypass line,

and that the exhaust gas supplied to the gasoline engine (1) in the unfired overrun operating phase through the bypass line to the gasoline engine (1)

is returned.

18. The method according to claim 17, characterized in that

that the exhaust gas supplied to the gasoline engine (1) exits the bypass line before the gasoline engine (1),

wherein the exhaust gas supplied to the gasoline engine (1) enters the bypass line between the gasoline engine (1) and a turbine (8) of a turbocharger (5) of the gasoline engine (1), or wherein the exhaust gas supplied to the gasoline engine (1) between the

Main catalyst (3) and a further catalyst, in particular one

Oxidation catalyst enters the bypass line,

or wherein the exhaust gas supplied to the gasoline engine (1) between the

Main catalyst or an oxidation catalyst and another

Catalytic converter of the exhaust gas aftertreatment system (2) enters the bypass line,

or wherein the exhaust gas supplied to the gasoline engine (1) enters the bypass line after the last catalyst (3) of the exhaust gas aftertreatment system (2).

19. The method according to any one of the preceding claims, characterized

featured,

that the gasoline engine arrangement comprises a low-pressure EGR system with a low-pressure EGR line,

and that the exhaust gas supplied to the gasoline engine (1) in the unfired overrun operation phase is returned to the gasoline engine (1) through the low-pressure EGR line.

20. The method according to claim 19, characterized in

that the exhaust gas supplied to the gasoline engine (1) exits the low-pressure EGR line before the gasoline engine (1),

wherein the exhaust gas supplied to the gasoline engine (1) enters the low-pressure EGR line between a turbine (8) of a turbocharger (5) of the gasoline engine (1) and the main catalytic converter (3),

or the exhaust gas fed to the gasoline engine (1) enters the low-pressure EGR line between the main catalytic converter (3) and a further catalytic converter, in particular an oxidation catalytic converter,

or the exhaust gas fed to the gasoline engine (1) enters the low-pressure EGR line between the main catalytic converter or an oxidation catalytic converter and a further catalytic converter of the exhaust gas aftertreatment system (2), or wherein the exhaust gas supplied to the gasoline engine (1) enters the low-pressure EGR line after the last catalyst (3) of the exhaust gas aftertreatment system (2).

21. The method according to any one of the preceding claims, characterized

featured,

that the exhaust gas aftertreatment system (2) the main catalyst (s) (3) and optionally one or more pre-catalyst (s) and / or one or more secondary catalyst (s), in particular one or more oxidation catalyst (s) which comprises an oxidation catalyst 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 filters and / or one or more NOx storage catalytic converter (s) and / or one or more

Exhaust aftertreatment component (s) (4), which comprise a NOx storage catalytic converter coating, and / or one or more SCR system (s) and / or one or more

Exhaust aftertreatment component (s) (4), which comprise an SCR coating, and / or comprise a secondary air injection,

or that the exhaust gas aftertreatment system (2) from the / the

Main catalyst (s) (3) 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 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) (4), which comprises a NOx storage catalyst coating, and / or one or more SCR system (s) and / or one or more

Exhaust aftertreatment component (s) (4), which comprises an SCR coating (s), and / or a secondary air injection.

22. The method according to any one of the preceding claims, characterized

featured,

that the exhaust gas aftertreatment system (2) has at least one main catalyst (3) and one downstream of the main catalyst (3) that can be regenerated using oxygen and / or nitrogen dioxide

Petrol engine particulate filter includes

that the exhaust aftertreatment system (2) one in the

Exhaust aftertreatment system (2) opening supply line that in a regeneration operation over the in the

Exhaust gas aftertreatment system (2) leading supply line 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,

wherein 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

Regeneration operation is less than 5 vol .-% or essentially zero, and / or wherein the amount of oxygen of the exhaust gas flowing through the main catalyst (3) in the regeneration operation or the amount of oxygen in the main catalyst (3) is kept so low that the efficiency of the main catalyst (3) is unaffected.

23. The method according to any one of the preceding claims, characterized

featured,

that the exhaust gas aftertreatment system (2) comprises a NOx storage catalytic converter arranged downstream of the main catalytic converter (3) and / or possibly the gasoline particle filter,

that the exhaust aftertreatment system (2) one in the

Exhaust gas aftertreatment system (2) leading supply line includes that in storage operation of the NOx storage catalytic converter oxygen and in particular air, preferably filtered and / or compressed ambient air, is fed to the NOx storage catalytic converter via the supply line leading into the exhaust gas aftertreatment system (2), that, if necessary, an oxidation catalyst between the

Main catalyst (3) and the NOx storage catalyst is provided, and that the oxidation catalyst comprises an oxidation catalyst coating,

Storage operation is less than 5% by volume or essentially zero,

and / or wherein the main catalytic converter (3) in storage mode

flowing oxygen quantity of the exhaust gas or the oxygen quantity of the exhaust gas located in the main catalyst (3) is kept so low that the efficiency of the main catalyst (3) is unaffected.

24. The method according to any one of the preceding claims, characterized

featured,

- That the exhaust gas aftertreatment system (2) comprises a SCR catalytic converter arranged downstream of the main catalytic converter (3), the oxidation catalytic converter and / or the gasoline engine particle filter,

that the SCR catalytic converter is optionally arranged in front of the NOx storage catalytic converter,

- That the exhaust aftertreatment system (2) one in the

Exhaust gas aftertreatment system (2) comprising supply line,

that oxygen and in particular air, preferably ambient air, optionally filtered or compressed, is fed to the SCR catalytic converter to reduce the nitrogen oxides in the reduction mode of the SCR catalytic converter to reduce the nitrogen oxides,

- The oxygen content of the main catalyst (3) flowing through

Exhaust gas in the reduction mode is less than 5 vol.% Or essentially zero,

- and / or wherein the main catalyst (3) in the reduction mode

flowing oxygen quantity of the exhaust gas is kept so low that the efficiency of the main catalyst (3) is unaffected.

25. The method according to any one of the preceding claims, characterized in that an operating material, in particular so-called AdBlue®, is introduced into the exhaust gas aftertreatment system (2) by a metering device upstream of the SCR catalytic converter, in particular after the oxidation catalytic converter,

wherein the operating material 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 Nhh, by the main catalytic converter (3), in particular by the 3-way catalytic converter, in the context of normal petrol engine operation and / or by temporary adjustment of the gasoline engine operating parameters of the gasoline engine (1), in particular by the gasoline engine (1)

is operated substoichiometrically, is generated.

26. Otto engine arrangement,

the gasoline engine arrangement comprising a gasoline engine (1) and a

Exhaust gas aftertreatment system (2) with at least one main catalyst (3),

the gasoline engine (1) being operable in an operating phase comprising a normal operating phase and an overrun operating phase,

the gasoline engine (1) converting fuel and air into exhaust gas in the normal operating phase,

the gasoline engine (1) being operated and / or regulated in the lambda window preferably by l = 1 in the normal operating phase,

wherein the overrun phase by at least one unfired

Overrun phase and / or at least one fired overrun phase is formed,

characterized, that an exhaust gas recirculation line (9) is provided, which supplies the gasoline engine (1) in an unfired overrun operating phase with the exhaust gas generated before or during the transition from the normal operating phase to the unfired overrun operating phase in the gasoline engine (1),

or that an exhaust gas recirculation line (9) is provided which, in an unfired overrun operating phase, gives the gasoline engine (1) that before or during the transition from the fired overrun operating phase to the unfired one

Thrust operating phase in the gasoline engine (1) supplies exhaust gas generated.

27. Gasoline engine arrangement according to claim 26, characterized in that the fuel supply is stopped in the unfired overrun operating phase.

28. Otto engine arrangement according to claim 26 or 27, characterized in that

- That the overrun phase by at least one unfired

Overrun phase and / or at least one fired overrun phase is formed,

- And that the gas flowing through the main catalytic converter (3) in the overrun fueling phase is essentially oxygen-free and in particular is the exhaust gas from stoichiometric or substoichiometric combustion.

29. Otto engine arrangement according to one of claims 26 to 28, characterized

characterized in that in the normal operating phase air, in particular oxygen, can be supplied to a NOx storage catalytic converter of the exhaust gas aftertreatment system (2) via the exhaust gas recirculation line (9), as a result of which the NOx storage catalytic converter can be operated within its regular storage mode.

30. Otto engine arrangement according to one of claims 26 to 29, characterized

characterized in that the gasoline engine arrangement is set up to carry out the method according to one of claims 1 to 25.

31. Otto engine arrangement according to one of claims 26 to 30, characterized

featured, that between the main catalyst (3) and one or the

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

or that one or the gasoline engine particle filter at least in its front

Area is provided with an oxidation catalyst coating, the oxidation catalyst coating being set up to convert NO with O2 to NO2.

32. Otto engine arrangement according to one of claims 26 to 31, characterized

featured,

that a, in particular catalytically coated, heating element for heating the main catalytic converter (3) is provided after the gasoline engine (1) and before the main catalytic converter (3), in particular in the front area of the main catalytic converter (3),

and / or that after the gasoline engine (1), in particular after the

Main catalyst (3), and in front of the oxidation catalyst, in particular in the front area of the oxidation catalyst, a, in particular catalytically coated, heating element for heating the oxidation catalyst is provided,

and / or that after the gasoline engine (1), in particular after the

Oxidation catalytic converter, and in front of 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 that after the gasoline engine (1), 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, a, in particular catalytically coated, heating element for heating the NOx storage catalytic converter is provided.

33. Otto engine arrangement according to one of claims 26 to 32, characterized

featured, that the gasoline engine arrangement a gasoline engine (1) and a

Exhaust gas aftertreatment system (2) with at least the main catalytic converter (3), the gasoline engine particle filter and a NOx storage catalytic converter that the main catalytic converter (3) is designed or acts as a 3-way catalytic converter,

that the main catalytic converter (3) is followed by the gasoline engine particle filter, which may act as a 4-way catalytic converter,

that the NOx storage catalytic converter is arranged downstream of the gasoline engine particle filter,

and that one or the oxidation catalytic converter is optionally arranged upstream of the NOx storage catalytic converter.

34. Otto engine arrangement according to one of claims 26 to 33, characterized

characterized in that the NOx storage catalyst in the flow direction of the exhaust gas is the last catalyst of the exhaust gas aftertreatment system (2).