DE102018219332A1 - Emission control device and motor vehicle - Google Patents

Abstract

The invention relates to an exhaust gas purification arrangement (1) for a motor vehicle, which has a hydrocarbon reservoir (3) and a reusable catalytic converter (4), the reusable catalytic converter (4) passing through the exhaust gas purification arrangement to the hydrocarbon accumulator (3) in an exhaust gas path (5) (1) follows, is downstream. The exhaust gas purification arrangement (1) is designed to obtain information about an exhaust gas composition of the exhaust gas downstream of the hydrocarbon store (3). The invention further relates to a motor vehicle which has such an exhaust gas purification arrangement (1) which is operatively connected to an internal combustion engine of the motor vehicle The proposed exhaust gas purification arrangement (1) enables better knowledge of the exhaust gas composition in the exhaust gas purification arrangement (1) downstream of the hydrocarbon reservoir (3).

Description

The present invention relates to an exhaust gas purification arrangement for a motor vehicle, which has a hydrocarbon accumulator and a reusable catalytic converter, the reusable catalytic converter being arranged downstream of the hydrocarbon accumulator in an exhaust gas path, which an exhaust gas follows through the exhaust gas purification arrangement.

The present invention further relates to a motor vehicle which has such an exhaust gas purification arrangement which is operatively connected to an internal combustion engine of the motor vehicle.

Exhaust gas purification arrangements, which have catalysts, are usually arranged close to the internal combustion engine of the motor vehicle in order to enable the fastest possible light-off. Electric heating catalytic converters are also known for accelerating the light-off.

The performance of these heated catalytic converters can be increased by arranging HC adsorbers, ie absorbers for hydrocarbons, in the exhaust gas path, which are also referred to as hydrocarbon stores in the context of this disclosure. These “collect” the hydrocarbons while the heating catalytic converter heats up the downstream catalytic converter system and release them again at higher temperatures. On the exhaust gas path, the exhaust gas therefore first passes through the hydrocarbon store and then through the catalyst system.

Because the hydrocarbons are stored in the hydrocarbon reservoir, an exhaust gas composition upstream of the multi-way catalytic converter, which is generally a three-way catalytic converter, is not known. A rich exhaust gas composition is expected. This applies in particular to hybrid vehicles, in which the internal combustion engine suddenly has to start at high load, and more particularly in the case of real driving emissions (in short: RDE, German: emissions in practical driving).

The object of the invention is to provide an exhaust gas purification arrangement and a motor vehicle which are improved compared to the prior art. In particular, an operation of the exhaust gas purification arrangement should be made more efficient.

The object of the invention is achieved by an exhaust gas purification arrangement of the type mentioned at the outset, which is set up to obtain information about the exhaust gas composition of the exhaust gas downstream of the hydrocarbon reservoir.

A better knowledge of the exhaust gas composition in the exhaust gas purification arrangement downstream of the hydrocarbon reservoir makes it possible to make the operation of the exhaust gas purification arrangement more efficient and, if necessary, to influence the exhaust gas composition in particular by adapting the operation, taking legal requirements into account.

Preferred embodiments of the invention form part of the dependent claims.

It is preferred that the exhaust gas purification arrangement is provided for controlling an oxygen concentration in the exhaust gas depending on the information. If one controls the oxygen concentration depending on the information, one can ensure that a cleaning performance of the exhaust gas cleaning arrangement is adequate in order to clean the exhaust gas sufficiently before being released into the environment. In this way, it can be prevented that the exhaust gas purification arrangement produces too little or too much cleaning power. In particular, the exhaust gas purification arrangement can become more efficient and can operate more cost-effectively if the hydrocarbon storage due to an activity increases or decreases the amount of hydrocarbon in the exhaust gas relative to the originally untreated exhaust gas and thus changes the exhaust gas composition before the exhaust gas reaches the exhaust gas aftertreatment device.

In the present sense, the term taxes is not necessarily to be understood only narrowly as the metrological term. Regulations can also be understood as taxes in the present case. Rather, the term control can generally be understood as the adjustment of the oxygen concentration taking into account the information obtained.

The activity of the hydrocarbon reservoir can be a hydrocarbon uptake amount per time interval and / or a hydrocarbon release amount per time interval. The more hydrocarbon the hydrocarbon reservoir takes up per time interval, the less hydrocarbon preferably contains the exhaust gas from which the hydrocarbon was taken up when it reaches the multi-way catalytic converter. The more previously taken up hydrocarbon the hydrocarbon store releases per time interval, the more hydrocarbon preferably contains the exhaust gas into which the hydrocarbon was released when it reaches the multi-way catalytic converter.

Cleaning performance can define a hydrocarbon removal rate. In embodiments, it is provided that the hydrocarbon removal rate of the exhaust gas cleaning arrangement has a setpoint value of more than 50% compared to has untreated exhaust gas. The hydrocarbon removal rate is particularly preferably greater than 75%, again preferably greater than 90%, particularly preferably greater than 99%. By controlling the oxygen concentration, a predetermined amount of hydrocarbon per exhaust gas volume can be achieved as a cleaning result, which is essentially constant, even if the activity of the hydrocarbon reservoir changes. The oxygen concentration can therefore preferably be controlled in such a way that a cleaning result of the exhaust gas cleaning arrangement is essentially constant.

It is preferred that the exhaust gas purification arrangement is set up to determine a partial gas concentration in the exhaust gas downstream of the hydrocarbon reservoir as the information in order to control the oxygen concentration as a function of the determined partial gas concentration. A preferred partial gas of the exhaust gas is oxygen, so that a preferred partial gas concentration is an oxygen concentration. Another preferred partial gas of the exhaust gas is hydrocarbon, so another preferred partial gas concentration is a hydrocarbon concentration. The information is particularly preferably determined as a measure of the activity of the hydrocarbon store. The exhaust gas makes it easy to draw a conclusion about the activity of the hydrocarbon reservoir. If the hydrocarbon uptake amount of the hydrocarbon reservoir per time interval is high, a comparatively low hydrocarbon concentration or a comparatively high oxygen concentration in the exhaust gas will be determined downstream. If the hydrocarbon uptake quantity of the hydrocarbon store per time interval is low or even negative, a comparatively high hydrocarbon concentration or a comparatively low oxygen concentration in the exhaust gas will be determined downstream. The oxygen concentration can be controlled accordingly, that is to say a higher oxygen supply is provided in the case of a high hydrocarbon concentration or low oxygen concentration and a lower oxygen supply is provided in the case of a low hydrocarbon concentration or high oxygen concentration. The control of the oxygen concentration is preferably set up proportional to the activity of the hydrocarbon reservoir.

It is preferred that the exhaust gas purification arrangement has a sensor downstream of the hydrocarbon reservoir, which sensor determines the partial gas concentration measurement result as the information. Knowing only a partial gas concentration may be sufficient to know whether the amount of oxygen in the exhaust gas needs to be adjusted by control. So the complete composition of the exhaust gas does not have to be monitored.

Some embodiments provide that the sensor is sensitive to oxygen to determine the partial gas concentration measurement result. Some embodiments provide that the sensor is sensitive to hydrocarbons to determine the partial gas concentration measurement result. Sensors for these partial gases of the exhaust gas are readily available and can be used in the exhaust gas cleaning arrangement. The exhaust gas purification arrangement preferably has as the sensor an oxygen concentration sensor downstream of the hydrocarbon reservoir, which determines an oxygen concentration measurement result as the information. The oxygen concentration measurement result is preferably an oxygen concentration in the exhaust gas. The oxygen concentration measurement result is preferably used to control the oxygen concentration as a function of the information, in particular the oxygen concentration in the exhaust gas. If the oxygen concentration sensor provides the oxygen concentration measurement result, the activity of the hydrocarbon reservoir does not have to be ascertained in a complicated manner directly on the basis of its performance data, but can simply be determined in particular via the oxygen concentration in the exhaust gas. In some embodiments, the exhaust gas purification arrangement has a nitrogen oxide sensor with hydrocarbon cross-sensitivity as the sensor, which is arranged downstream of the hydrocarbon reservoir and which determines a hydrocarbon concentration measurement result as the information. For the nitrogen oxide sensor, the above is written mutatis mutandis for the oxygen concentration sensor.

The sensor is preferably arranged in the exhaust gas path between the hydrocarbon reservoir and the multi-way catalytic converter. This allows the partial gas concentration measurement result to be determined before the exhaust gas reaches the multi-way catalyst. This enables efficient control of the oxygen concentration. In some embodiments, however, the sensor is arranged downstream of the multi-way catalytic converter, in particular arranged at an outlet of the exhaust gas cleaning arrangement. Then the oxygen concentration of the exhaust gas can be readjusted depending on the oxygen concentration of the exhaust gas released into the environment. Some embodiments provide a first sensor, which is located upstream of the reusable catalytic converter, and a second sensor, which is located downstream of the multi-way catalytic converter. In this way, the hydrocarbon removal rate of the exhaust gas aftertreatment device can be monitored particularly reliably because two sensors are present which can measure the partial gas concentration at different points along the exhaust gas path. The sensors can each be sensitive to a different partial gas of the exhaust gas.

The sensor is preferably located immediately downstream of the hydrocarbon reservoir. In this way, changes in the exhaust gas composition that are attributable to the hydrocarbon storage can be detected particularly promptly.

It is preferred that the sensor is oriented at an angle of less than 90 ° and greater than 0 ° against the exhaust gas path. A sensor measurement surface is therefore preferably directed in the direction of the hydrocarbon reservoir, so that a normal vector of the sensor measurement surface preferably points with a direction component to the hydrocarbon reservoir. The angle is preferably between 40 ° and 60 °, in particular 45 °. A particularly meaningful measurement result can be obtained in this way.

It is preferred that the exhaust gas purification arrangement has a secondary air pump in order to introduce secondary air into the exhaust gas path. In embodiments, a fuel-air mixture for the internal combustion engine can be adjusted based on the information. The oxygen concentration is usually influenced by an external engine control unit which provides the fuel / air mixture for the internal combustion engine of the vehicle. If the oxygen concentration in the exhaust gas can no longer be increased sufficiently by adapting the fuel-air mixture for the internal combustion engine, for example because otherwise the fuel-air mixture would become too lean, secondary air can be fed into the exhaust gas path downstream of the internal combustion engine, preferably into the exhaust gas cleaning arrangement, through the secondary air pump, to increase the oxygen concentration. This situation can occur, for example, when the internal combustion engine is already operating on a particularly lean fuel / air mixture and at the same time the hydrocarbon storage device introduces a large amount of hydrocarbon into the exhaust gas. The secondary air pump is preferably set up to provide ambient air to the exhaust gas purification arrangement in order to increase the oxygen concentration in the exhaust gas if necessary. It is particularly preferred that the secondary air pump is arranged in the exhaust gas path between the hydrocarbon reservoir and the reusable catalytic converter.

The hydrocarbon reservoir is preferably set up to store hydrocarbon from the exhaust gas, in particular at a first temperature, and to release it again to the exhaust gas, in particular at a second temperature which is higher than the first temperature. This ensures reliable operation of the hydrocarbon reservoir. The first temperature and the second temperature are preferably operating temperatures of the exhaust gas purification arrangement or of the multi-way catalytic converter. As an alternative to this, the hydrocarbon reservoir can be set up to release hydrocarbon taken up from the exhaust gas back into the exhaust gas by triggering an active regeneration.

Embodiments provide that the exhaust gas purification arrangement has a housing which encloses the exhaust gas path. The housing preferably radially encloses the exhaust gas path. The housing preferably provides an essentially cylindrical exhaust gas tunnel for the exhaust gas path. The hydrocarbon reservoir, the reusable catalytic converter, the sensor and preferably further elements such as heating catalytic converters can be arranged in the housing. For example, all components of the exhaust gas cleaning arrangement can be provided and enclosed in a single compact component. The exhaust gas cleaning arrangement, which has the housing, particularly preferably forms a motor vehicle catalytic converter assembly, which preferably has the outlet of the exhaust gas cleaning arrangement, which can preferably be connected to an end pipe of the motor vehicle. A sensor housing of the sensor preferably penetrates the housing. In some embodiments, the sensor is arranged on an inner wall of the housing. So the sensor can be stably mounted on the housing.

Embodiments provide that the exhaust gas purification arrangement has a control unit contact which can be connected to an external control unit in order to forward the information to the external control unit. The control unit contact is preferably set up to route a data line, which is connected to the sensor for signaling purposes, to output the information. The external control unit is preferably an engine control unit of the motor vehicle. Instead, some embodiments provide an internal control unit which is arranged in the exhaust gas purification arrangement separately from the exhaust gas path.

A preferred multi-way catalyst is a three-way catalyst. The reusable catalytic converter is preferably heated, in particular by a heating element integrated therein or a heating catalytic converter upstream in the exhaust gas path or a heating element arranged upstream in the exhaust gas path. The upstream heating catalytic converter can be a further multi-way catalytic converter, in particular a three-way catalytic converter. It is particularly preferred that the sensor is arranged in the exhaust gas path between the hydrocarbon reservoir and the reusable catalytic converter. The exhaust gas path is therefore preferably arranged such that the exhaust gas on the exhaust gas path first passes through the hydrocarbon reservoir, then the sensor and then the multi-way catalytic converter. So a very efficient and effective cleaning of the Exhaust gas, in particular with regard to hydrocarbons, be made possible.

The object of the invention is further achieved by a motor vehicle of the type mentioned at the outset, the exhaust gas cleaning arrangement being set up to obtain information about an exhaust gas composition of the exhaust gas downstream of the hydrocarbon reservoir.

A better knowledge of the exhaust gas composition in the exhaust gas purification arrangement downstream of the hydrocarbon reservoir makes it possible to make the operation of the motor vehicle more efficient and, if necessary, to influence the exhaust gas composition in particular by adapting the operation, taking legal requirements into account.

The motor vehicle is preferably set up to control an oxygen concentration in the exhaust gas as a function of the information. If the oxygen concentration is preferably controlled as a function of the information, it can be ensured that the cleaning performance of the exhaust gas cleaning arrangement is adequate in order to sufficiently clean the exhaust gas from hydrocarbons. In this way, it can in particular be prevented that the exhaust gas purification arrangement produces too little or too much cleaning power, in particular because of the upstream hydrocarbon reservoir. A hydrocarbon peak in an end pipe of the motor vehicle can thus also be effectively prevented. In this way, the motor vehicle can become more efficient and can work more economically.

It is particularly preferred that the motor vehicle is set up to determine a partial gas concentration in the exhaust gas downstream of the hydrocarbon store as the information and to control the oxygen concentration as a function of the determined partial gas concentration. The activity of the hydrocarbon store can thus be determined in a simple manner on the basis of the partial gas concentration of the exhaust gas that has passed through the hydrocarbon store. A sensor is preferably provided for this purpose, which is located downstream of the hydrocarbon reservoir in the exhaust gas path, in particular immediately downstream. The sensor is preferably located upstream of the multi-way catalytic converter.

The motor vehicle preferably has an engine control unit which is set up to provide a fuel / air mixture for an internal combustion engine, which is compiled at least in part based on the information in order to control the oxygen concentration in the exhaust gas. For this purpose, it is preferably provided that the engine control unit is connected to the sensor in terms of signal technology, in particular via a data cable, in order to receive the information from the sensor.

The motor vehicle is preferably a hybrid vehicle. Preferred hybrid vehicles include an electric motor and the internal combustion engine, in particular a gasoline engine or a diesel engine. Hybrid vehicles in particular can benefit from the increased efficiency of the exhaust gas cleaning arrangement, especially when starting off at high loads. The internal combustion engine is preferably connected to the inlet of the exhaust gas purification arrangement in order to provide the exhaust gas to the exhaust gas purification arrangement. The exhaust gas arises, at least in part, from the combustion of fuel in the internal combustion engine.

Further possible configurations and possible advantages of the motor vehicle result analogously to the statements above with regard to the exhaust gas cleaning arrangement.

• 1 einen schematischen Querschnitt durch eine Ausführungsform der Abgasreinigungsanordnung gemäß der Erfindung entlang des Abgaspfads zeigt.

The invention is described below using a non-limiting exemplary embodiment and with reference to the accompanying drawing, in which:

• 1 shows a schematic cross section through an embodiment of the exhaust gas purification arrangement according to the invention along the exhaust gas path.

In the following detailed description of the exemplary embodiment, in the accompanying drawings and in the appended claims, which define the scope of the invention, reference numerals have been inserted for readability purposes, but are not intended to have any restrictive effect.

1 shows an exhaust gas purification arrangement 1 for a motor vehicle. The exhaust gas purification arrangement 1 is installed in a hybrid vehicle, which is not shown for the sake of simplicity. The hybrid vehicle has an electric motor, not shown, and an internal combustion engine, not shown, namely a diesel engine. The diesel engine is with an inlet 2nd the exhaust gas purification arrangement 1 connected to exhaust gas for cleaning at the exhaust gas purification assembly 1 to provide.

The exhaust gas purification arrangement 1 has a hydrocarbon storage 3rd and a multi-way catalyst 4th on, the multi-way catalyst 4th the hydrocarbon storage 3rd in an exhaust path 5 which an exhaust gas through the exhaust gas purification arrangement 1 follows through, is downstream.

The exhaust gas flows through the inlet during operation 2nd entering along the exhaust path 5 So first the hydrocarbon storage 3rd and then the multi-way catalyst 4th and finally occurs at least partially cleaned, i.e. with a changed exhaust gas composition and reduced amount of pollutants compared to the exhaust gas composition at the inlet 2nd , from an outlet 6 from the exhaust gas purification arrangement 1 out. The multi-way catalytic converter 4th is in the exhaust path 5 a heating catalyst 7 immediately upstream. The heating catalytic converter 7 heats the downstream reusable catalytic converter 4th . In some embodiments, the heating catalyst is 7 but simply replaced by a heating element or the reusable catalyst 4th includes an integrated heating function. The multi-way catalytic converter 4th is an example of a three-way catalyst. The exhaust gas purification arrangement 1 has a housing 8th on that the exhaust path 5 encloses, namely radially.

The hydrocarbon store 3rd is configured to store hydrocarbons from the exhaust gas at a first temperature and to release them back into the exhaust gas at a second temperature that is higher than the first temperature. The exhaust gas purification arrangement 1 is set up to provide information about an exhaust gas composition of the exhaust gas downstream of the hydrocarbon reservoir 3rd to obtain.

The exhaust gas purification arrangement 1 is intended to control an oxygen concentration in the exhaust gas depending on the information. This ensures that the emission control system 1 taking into account the activity of the hydrocarbon storage 3rd works with adequate, preferably substantially constant, cleaning performance. For example, hydrocarbon peaks in an end pipe (not shown) of the motor vehicle, which the exhaust gas purification arrangement 1 the exhaust gas through the outlet 6 feeds, be avoided.

The exhaust gas purification arrangement 1 is set up to a partial gas concentration in the exhaust gas downstream of the hydrocarbon storage 3rd than to determine the information to control the oxygen concentration depending on the determined partial gas concentration. In order to obtain the information, the exhaust gas purification arrangement points 1 downstream of the hydrocarbon reservoir 3rd a sensor 9 which determines a partial gas concentration measurement result in the exhaust gas as the information. The sensor 9 is sensitive to oxygen in the present exemplary embodiment in order to determine the partial gas concentration measurement result and is therefore an oxygen concentration sensor, namely a lambda probe.

The determined oxygen concentration measurement result is then via a control unit contact 10th to a control unit (not shown) of the vehicle to adjust a fuel air mixture of the diesel engine, thereby controlling the oxygen concentration in the exhaust gas. The control unit contact 10th is connected to the sensor using a data cable 9 signal connected to the information about the control unit contact 10th to be able to provide. The sensor 9 is in the exhaust path 5 between the hydrocarbon storage 3rd and the multi-way catalyst 4th arranged. The sensor 9 is also the heating catalyst 7 in the exhaust path 5 upstream. The sensor 9 is also the hydrocarbon storage 3rd in the exhaust path 5 immediately downstream. The sensor 9 is at an angle of less than 90 ° and greater than 0 ° against the exhaust gas path 5 aligned, namely at an angle of about 45 ° to enable a meaningful measurement.

Is the oxygen concentration downstream of the hydrocarbon storage 3rd by the sensor 9 is determined, comparatively high, then, caused by the control unit of the motor vehicle, a richer fuel-air mixture is provided for the internal combustion engine. Is the oxygen concentration downstream of the hydrocarbon storage 3rd by the sensor 9 is determined, but comparatively low, then a leaner fuel-air mixture is then provided for the internal combustion engine, prompted by the control unit of the motor vehicle.

The activity of the hydrocarbon storage 3rd affects the oxygen concentration in the exhaust gas. The activity is an absorption of hydrocarbon into the hydrocarbon reservoir 3rd , then the oxygen concentration is behind the hydrocarbon storage 3rd by the sensor 9 is determined, comparatively high. The fuel / air mixture can then be made correspondingly more enriched by the control unit of the motor vehicle. The activity, however, is a release of hydrocarbon from the hydrocarbon storage 3rd into the exhaust gas, then the oxygen concentration is downstream of the hydrocarbon storage 3rd by the sensor 9 is determined, comparatively low. The fuel / air mixture should then also be made correspondingly leaner by the control unit of the motor vehicle to the internal combustion engine.

It can happen that the oxygen concentration in the exhaust gas by the sensor 9 is determined to be relatively low, but the fuel-air mixture of the internal combustion engine cannot be controlled even leaner by the control unit of the motor vehicle without impairing internal combustion engine performance too much.

For example, in this case, the exhaust gas purification arrangement 1 a secondary air pump 11 on. The secondary air pump 11 is like the sensor 9 , for example between the hydrocarbon storage 3rd and the multi-way catalyst 4th arranged. The secondary air pump 11 is the heating catalyst 7 upstream in the exhaust path. The secondary air pump 11 is arranged to allow ambient air into the exhaust path 5 introduce. Thus, the oxygen concentration in the exhaust gas can be increased before being released to the environment, if necessary, without supplying the internal combustion engine of the motor vehicle with an excessively lean fuel / air mixture.

In other words, it is shown that the exhaust gas purification arrangement 1 between the HC adsorber, i.e. the hydrocarbon storage 3rd , and the three-way catalyst 4th a lambda sensor as a sensor 9 has, which is used for controlling the amount of oxygen. If there is not enough air through the combustion engine, this can also be done through the secondary air pump 11 are fed. By shifting the measurement of the stoichiometry to the HC adsorber 3rd the hydrocarbons emitted by this are also taken into account in the control and thus the risk of HC peaks in the tailpipe, not shown, is reduced.

In embodiments not shown, the sensor is 9 a nitrogen oxide sensor with HC cross sensitivity instead of the lambda sensor. This measures the hydrocarbon concentration in the exhaust gas instead of the oxygen concentration. The hydrocarbon concentration in the exhaust gas downstream of the hydrocarbon reservoir 3rd can be relatively high if the oxygen concentration in the exhaust gas downstream of the hydrocarbon storage 3rd is relatively low and vice versa. The above explanations for the lambda sensor also apply mutatis mutandis to the nitrogen oxide sensor with HC cross-sensitivity. The exhaust gas cleaning arrangement can have particular advantages 1 for hybrid vehicles in RDE operation.

Claims (10)

Exhaust gas purification arrangement (1) for a motor vehicle, which has a hydrocarbon accumulator (3) and a reusable catalytic converter (4), the reusable catalytic converter (4) passing through the exhaust gas purification arrangement (1) to the hydrocarbon accumulator (3) in an exhaust gas path (5) follows, is downstream, characterized in that the exhaust gas purification arrangement (1) is set up to receive information about an exhaust gas composition of the exhaust gas downstream of the hydrocarbon reservoir (3). Exhaust gas purification arrangement (1) after Claim 1 , characterized in that the exhaust gas purification arrangement (1) is intended to control an oxygen concentration in the exhaust gas depending on the information. Exhaust gas purification arrangement (1) after Claim 2 , characterized in that the exhaust gas purification arrangement (1) is set up to determine a partial gas concentration in the exhaust gas downstream of the hydrocarbon reservoir (3) as the information in order to control the oxygen concentration depending on the determined partial gas concentration. Exhaust gas purification arrangement (1) according to one of the preceding claims, characterized in that the exhaust gas purification arrangement (1) downstream of the hydrocarbon reservoir (3) has a sensor (9) which determines a partial gas concentration measurement result as the information. Exhaust gas purification arrangement (1) after Claim 4 , characterized in that the sensor (9) is sensitive to oxygen and / or hydrocarbon in order to determine the partial gas concentration measurement result. Exhaust gas purification arrangement (1) after Claim 4 or 5 , characterized in that the sensor (9) is arranged in the exhaust gas path (5) between the hydrocarbon reservoir (3) and the reusable catalyst (4). Exhaust gas purification arrangement (1) according to one of the Claims 4 to 6 , characterized in that the sensor is oriented at an angle of less than 90 ° and greater than 0 ° against the exhaust gas path (5). Exhaust gas purification arrangement (1) according to one of the preceding claims, characterized in that the exhaust gas purification arrangement (1) has a secondary air pump (11) in order to introduce secondary air into the exhaust gas path. Motor vehicle having an exhaust gas purification arrangement (1) Claim 1 has, which is operatively connected to an internal combustion engine of the motor vehicle. Motor vehicle after Claim 9 , characterized in that the motor vehicle is set up to control an oxygen concentration in the exhaust gas depending on the information.

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