US20100050599A1 - Method and Device for Addition of a Reducing Agent in an Exhaust Gas Line of an Internal Combustion Engine of a Motor Vehicle - Google Patents

Method and Device for Addition of a Reducing Agent in an Exhaust Gas Line of an Internal Combustion Engine of a Motor Vehicle Download PDF

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US20100050599A1
US20100050599A1 US12/552,844 US55284409A US2010050599A1 US 20100050599 A1 US20100050599 A1 US 20100050599A1 US 55284409 A US55284409 A US 55284409A US 2010050599 A1 US2010050599 A1 US 2010050599A1
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exhaust gas
gas line
reducing agent
motor vehicle
internal combustion
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US12/552,844
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Andre Kopp
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Audi AG
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Audi AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • F01N3/0885—Regeneration of deteriorated absorbents or adsorbents, e.g. desulfurization of NOx traps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/10—Fitting temporarily exhaust apparatus on exhaust conduit, e.g. in confined environment, garage or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance

Definitions

  • the invention relates to a method for the addition of a reducing agent in an exhaust gas line of an internal combustion engine of a motor vehicle.
  • NO x storage catalysts As service life increases, NO x regeneration capacity is reduced by the sulfur components that are contained in the fuel or motor oil and that are deposited in the NO x storage catalyst.
  • various regeneration measures are already known for NO x storage catalysts.
  • a desulfurization of an NO x storage catalyst can be achieved by traveling at high loads and high catalyst temperatures, which represents a so-called passive regeneration.
  • a desulfurization can also, however, be actively carried out by an operating method of the internal combustion engine, by which the NO x storage catalyst temperature is increased in connection with an at least temporary exhaust gas enrichment, and reducing agent from the combustion engine is provided at the same time by the combustion under lean-air conditions.
  • a method for operating a motor vehicle with an NO x storage catalyst in which in connection with an extensive availability of low-sulfur or sulfur-free fuels, the value of a state variable that characterizes a degree of sulfur contamination of the NO x storage catalyst is first determined.
  • a state variable the NO x storage activity of the catalyst or the amount of NO x that can be stored in the catalyst during a lean phase can be selected here.
  • the amount of sulfur that is stored in the catalyst during a preset time interval can also be selected.
  • variables can be the timing and duration of a release of a lean operating phase of the internal combustion engine that are determined based on the amount of NO x that can be stored in the catalyst during a lean phase, and the release period of the lean operating phase is selected as a state variable.
  • an adjustment of the internal combustion engine in the operating phase is then carried out with a substoichiometric fuel-air ratio, the degree of efficiency of the internal combustion engine at any operating point between 50 km/h and 100 km/h being at most 3% worse than the same operating point without the generated state signal, in particular at an operating point that corresponds to steady, straight and level travel at an outside temperature of 20°.
  • a method for reactivating a nitrogen oxide storage catalyst which has basic strontium or barium compounds on a carrier material that contains cerium oxide and, moreover, contains, with the carrier material, strontium and/or barium compounds that are formed by thermal aging, is known from DE 10 2005 034 344 A1.
  • the compounds of strontium and/or barium are decomposed with the carrier material by treatment with a gas mixture that contains nitrogen dioxide, water vapor and optionally carbon dioxide at temperatures of between 300° and 500° C.
  • An optimized regeneration of a nitrogen oxide storage catalyst is to be achieved therefrom.
  • the object of this invention is to make available a method and a device for the addition of a reducing agent in an exhaust gas line of an internal combustion engine of a motor vehicle, by means of which, in particular in connection with low-sulfur fuels, a reliable and fail-safe regeneration of an NO x storage catalyst of an exhaust gas line of an internal combustion engine that is optimized in the event of regeneration is possible.
  • a metering device by means of which at preset times, a preset amount of a reducing agent can be introduced into an exhaust gas line of an internal combustion engine of a motor vehicle, to create a stationary gas line connecting element that is made up of multiple parts at a defined position on the exhaust gas line and a connecting counter-element that can be connected in a detachable manner to this connecting element and that can be arranged independently of the exhaust gas line and motor vehicle and that can be arranged in particular removed from the motor vehicle.
  • the separate, connecting counter-element that is not carried along can preferably be connected to the exhaust gas line connecting element if the motor vehicle is parked and/or the internal combustion engine is idling, and then, for purposes of regeneration of at least one NO x storage catalyst for a preset time, a preset amount of reducing agent at a preset temperature can be introduced into the exhaust gas line. After completion of the regeneration, the connecting counter-element can again be detached from the exhaust gas line connecting element and secured at the site provided for this purpose.
  • This solution according to the invention is advantageous in particular in such internal combustion engines that are operated with a fuel whose sulfur content is less than or equal to 30 ppm, in particular less than or equal to 10 ppm.
  • the reducing agent is preferably a mixture of substances, with a sulfur content of less than or equal to 30 ppm, in particular less than or equal to 10 ppm.
  • targeted desulfurization can be performed, namely independently of a street operation of a motor vehicle, in particular in connection with low-sulfur fuels during servicing of the motor vehicle at an auto repair shop or at a service facility.
  • the often difficult and emergency servicing of engine electronics during the operation of a motor vehicle as well as other measures to be scheduled can be performed without the driver being aware of them and will therefore also not impair the driving comfort of the motor vehicle.
  • secondary emissions as well as changes in combustion noise can be reliably prevented.
  • the connecting counter-element can be a component of a stationary or mobile desulfurization device that is arranged at a service facility or auto repair shop.
  • service sites can be set up at a service facility, by means of which the desulfurization and thus the regeneration of existing NO x storage catalysts can easily be performed during service.
  • the connecting counter-element and the exhaust gas line connecting element can especially preferably be connected by means of a quick-release fastener.
  • This quick-release fastener can be designed especially simply to be sealed, in particular gas-tight and/or fluid-tight.
  • the desulfurization device can preferably be designed with a reducing agent reservoir for a reducing agent, as well as also a control and regulating device for defined charging of the exhaust gas line with reducing agent.
  • a reliable and fail-safe addition of reducing agent during service is possible.
  • the desulfurization device has a line connection, in particular a hose line connection, between the reducing agent reservoir and the connecting counter-element, whereby the control and/or regulating device is then coupled or integrated indirectly or preferably directly into the hose line connection in the area between the connecting counter-element and the reducing agent reservoir.
  • the desulfurization device can also have a heating device, by means of which the reducing agent can be heated to a preset temperature. Thus, it is particularly easily ensured that the regeneration can also actually be performed effectively at the necessary temperatures.
  • the exhaust gas line connecting element can be arranged in the exhaust gas line in the area between a diesel particle filter and an NO x storage catalyst, i.e., it can thus, according to a general idea, be arranged in front of at least one NO x storage catalyst in the direction of flow.
  • FIG. 1 is a diagram of a desulfurization system embodying the present invention connected to an exhaust gas system of a motor vehicle.
  • the single figure shows diagrammatically a design of an exhaust gas system of a motor vehicle with an internal combustion engine 1 , to which an exhaust gas line 2 is connected, in which, seen in the flow direction of the exhaust gas stream, an oxidation catalyst 3 , a diesel particle filter 4 , an NO x storage catalyst 5 , a locking catalyst 6 as well as a noise damper 7 are integrated.
  • the catalysts or other components can have a conventional design and are not explained in more detail below.
  • a connecting point 8 for reducing agents during service is provided here.
  • a metering device 9 which is made up of multiple parts from a stationary, gas line-side gas line connecting element 9 a and a connecting counter-element 9 b that can be connected detachably to the latter, is provided.
  • the two components 9 a, 9 b are preferably designed here in the form of a quick-coupling connection, so that a tight connection of the two components 9 a, 9 b can be carried out in a quick and reliable as well as fail-safe way. The same applies analogously to the loosening of the connection.
  • the connecting counter-element 9 b can be connected here to a reducing agent reservoir 12 , which, e.g., is preferably a component of a stationary or mobile desulfurization device 13 , which is indicated in broken lines in FIG. 1 , via a hose line 10 , by interposing a control and regulating device 11 .
  • a reducing agent reservoir 12 which, e.g., is preferably a component of a stationary or mobile desulfurization device 13 , which is indicated in broken lines in FIG. 1 , via a hose line 10 , by interposing a control and regulating device 11 .
  • This desulfurization device 13 can form, e.g., a service point at a motor vehicle repair shop, in which during service of the motor vehicle, the connecting counter-element 9 b is connected to the exhaust gas line connecting element 9 a in order to add a preset amount of reducing agent to regenerate the NO x storage catalyst 5 in the exhaust gas line 2 when the motor vehicle is parked, or the internal combustion engine is idling, controlled or regulated as required by the control and/or regulating device 11 , for a preset time period.
  • the added reducing agent is preferably, as is the fuel, by means of which the internal combustion engine 1 is operated, a low-sulfur mixture of substances that has sulfur values of below 30 ppm.
  • the reducing agent of the desulfurization device 13 can also be preheated to be fed or added in the heated state to the exhaust gas line 2 .
  • a component of the desulfurization device 13 can also be a pumping device, by means of which it is ensured that the added reducing agent is added to the exhaust gas line at a specific pressure.
  • a nozzle device is preferably provided, by means of which a fine distribution of the added reducing agent into the exhaust gas line 2 is possible.
  • corresponding communication devices would also make it possible for this service point to communicate with the engine control of the respective motor vehicle during the regeneration; such communication would perform a “reset” subsequent to a successful regeneration.
  • sensor data such as, for example, temperature and/or lambda values
  • engine control device could also be used for monitoring or regulating.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention relates to a method and a device for the addition of a reducing agent in an exhaust gas line of an internal combustion engine of a motor vehicle, with at least one NOx storage catalyst that is arranged in the exhaust gas line of the internal combustion engine, and with a metering device, by means of which a preset amount of a reducing agent is introduced into the exhaust gas line at preset times. The metering device is created from a stationary gas line connecting element that is made up of multiple parts at a defined position on the exhaust gas line and a connecting counter-element that can be connected in a detachable manner to this connecting element and that can be arranged independently of the exhaust gas line and motor vehicle, in particular removed from the motor vehicle, in such a way that the connecting counter-element, during service, in particular when the motor vehicle is parked and/or the internal combustion engine is idling, is connected to the exhaust gas line connecting element, and then, for purposes of regeneration of at least one NOx storage catalyst for a preset time, a preset amount of reducing agent is introduced into the exhaust gas line. After the regeneration, the connecting counter-element is again detached from the exhaust gas line connecting element and stored at a preset location.

Description

  • The invention relates to a method for the addition of a reducing agent in an exhaust gas line of an internal combustion engine of a motor vehicle.
    • BACKGROUND OF THE INVENTION
  • It is generally known that in NOx storage catalysts, as service life increases, NOx regeneration capacity is reduced by the sulfur components that are contained in the fuel or motor oil and that are deposited in the NOx storage catalyst. To counteract such a sulfur contamination, various regeneration measures are already known for NOx storage catalysts. For example, such a desulfurization of an NOx storage catalyst can be achieved by traveling at high loads and high catalyst temperatures, which represents a so-called passive regeneration. Alternatively to this, a desulfurization can also, however, be actively carried out by an operating method of the internal combustion engine, by which the NOx storage catalyst temperature is increased in connection with an at least temporary exhaust gas enrichment, and reducing agent from the combustion engine is provided at the same time by the combustion under lean-air conditions. The currently common sulfur contents in the fuel of 10 to 50 ppm make it necessary to desulfurize the NOx storage catalyst in order to meet the applicable exhaust gas standard approximately every 500 to 5,000 km. All such known active desulfurization methods for NOx storage catalysts are based on providing elevated exhaust gas temperatures of over 550° C. in connection with a rich exhaust gas composition.
  • From DE 102 23 595 A1, moreover, a method is known for operating a motor vehicle with an NOx storage catalyst, in which in connection with an extensive availability of low-sulfur or sulfur-free fuels, the value of a state variable that characterizes a degree of sulfur contamination of the NOx storage catalyst is first determined. As a state variable, the NOx storage activity of the catalyst or the amount of NOx that can be stored in the catalyst during a lean phase can be selected here. In addition, as a state variable, the amount of sulfur that is stored in the catalyst during a preset time interval can also be selected. In addition, other variables can be the timing and duration of a release of a lean operating phase of the internal combustion engine that are determined based on the amount of NOx that can be stored in the catalyst during a lean phase, and the release period of the lean operating phase is selected as a state variable.
  • Based on the thus determined value of the state variable, an adjustment of the internal combustion engine in the operating phase is then carried out with a substoichiometric fuel-air ratio, the degree of efficiency of the internal combustion engine at any operating point between 50 km/h and 100 km/h being at most 3% worse than the same operating point without the generated state signal, in particular at an operating point that corresponds to steady, straight and level travel at an outside temperature of 20°.
  • In addition, a method for reactivating a nitrogen oxide storage catalyst, which has basic strontium or barium compounds on a carrier material that contains cerium oxide and, moreover, contains, with the carrier material, strontium and/or barium compounds that are formed by thermal aging, is known from DE 10 2005 034 344 A1. For regeneration, the compounds of strontium and/or barium are decomposed with the carrier material by treatment with a gas mixture that contains nitrogen dioxide, water vapor and optionally carbon dioxide at temperatures of between 300° and 500° C. An optimized regeneration of a nitrogen oxide storage catalyst is to be achieved therefrom.
  • The object of this invention is to make available a method and a device for the addition of a reducing agent in an exhaust gas line of an internal combustion engine of a motor vehicle, by means of which, in particular in connection with low-sulfur fuels, a reliable and fail-safe regeneration of an NOx storage catalyst of an exhaust gas line of an internal combustion engine that is optimized in the event of regeneration is possible.
    • SUMMARY OF THE INVENTION
  • According to the invention, a metering device is provided, by means of which at preset times, a preset amount of a reducing agent can be introduced into an exhaust gas line of an internal combustion engine of a motor vehicle, to create a stationary gas line connecting element that is made up of multiple parts at a defined position on the exhaust gas line and a connecting counter-element that can be connected in a detachable manner to this connecting element and that can be arranged independently of the exhaust gas line and motor vehicle and that can be arranged in particular removed from the motor vehicle. With such a multi-part design of the metering device, for service, the separate, connecting counter-element that is not carried along can preferably be connected to the exhaust gas line connecting element if the motor vehicle is parked and/or the internal combustion engine is idling, and then, for purposes of regeneration of at least one NOx storage catalyst for a preset time, a preset amount of reducing agent at a preset temperature can be introduced into the exhaust gas line. After completion of the regeneration, the connecting counter-element can again be detached from the exhaust gas line connecting element and secured at the site provided for this purpose.
  • This solution according to the invention is advantageous in particular in such internal combustion engines that are operated with a fuel whose sulfur content is less than or equal to 30 ppm, in particular less than or equal to 10 ppm. Also, the reducing agent is preferably a mixture of substances, with a sulfur content of less than or equal to 30 ppm, in particular less than or equal to 10 ppm.
  • With such a solution according to the invention, targeted desulfurization can be performed, namely independently of a street operation of a motor vehicle, in particular in connection with low-sulfur fuels during servicing of the motor vehicle at an auto repair shop or at a service facility. Thus, the often difficult and emergency servicing of engine electronics during the operation of a motor vehicle as well as other measures to be scheduled can be performed without the driver being aware of them and will therefore also not impair the driving comfort of the motor vehicle. Moreover, as a result, secondary emissions as well as changes in combustion noise can be reliably prevented.
  • According to another preferred configuration, the connecting counter-element can be a component of a stationary or mobile desulfurization device that is arranged at a service facility or auto repair shop. Thus, e.g., service sites can be set up at a service facility, by means of which the desulfurization and thus the regeneration of existing NOx storage catalysts can easily be performed during service.
  • The connecting counter-element and the exhaust gas line connecting element can especially preferably be connected by means of a quick-release fastener. This quick-release fastener can be designed especially simply to be sealed, in particular gas-tight and/or fluid-tight.
  • Moreover, the desulfurization device can preferably be designed with a reducing agent reservoir for a reducing agent, as well as also a control and regulating device for defined charging of the exhaust gas line with reducing agent. Thus, a reliable and fail-safe addition of reducing agent during service is possible.
  • According to another actual configuration, the desulfurization device has a line connection, in particular a hose line connection, between the reducing agent reservoir and the connecting counter-element, whereby the control and/or regulating device is then coupled or integrated indirectly or preferably directly into the hose line connection in the area between the connecting counter-element and the reducing agent reservoir.
  • The desulfurization device can also have a heating device, by means of which the reducing agent can be heated to a preset temperature. Thus, it is particularly easily ensured that the regeneration can also actually be performed effectively at the necessary temperatures.
  • According to an actual configuration, the exhaust gas line connecting element can be arranged in the exhaust gas line in the area between a diesel particle filter and an NOx storage catalyst, i.e., it can thus, according to a general idea, be arranged in front of at least one NOx storage catalyst in the direction of flow.
    • BRIEF DESCRIPTION OF THE DRAWING
  • FIG. 1 is a diagram of a desulfurization system embodying the present invention connected to an exhaust gas system of a motor vehicle.
  • The
    •  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION
  • The single figure shows diagrammatically a design of an exhaust gas system of a motor vehicle with an internal combustion engine 1, to which an exhaust gas line 2 is connected, in which, seen in the flow direction of the exhaust gas stream, an oxidation catalyst 3, a diesel particle filter 4, an NOx storage catalyst 5, a locking catalyst 6 as well as a noise damper 7 are integrated. In this case, the catalysts or other components can have a conventional design and are not explained in more detail below.
  • In the area between the diesel particle filter 4 and the NOx storage catalyst 5, a connecting point 8 for reducing agents during service is provided here. At this connecting point 8, a metering device 9, which is made up of multiple parts from a stationary, gas line-side gas line connecting element 9 a and a connecting counter-element 9 b that can be connected detachably to the latter, is provided. As this is depicted only diagrammatically in FIG. 1, the two components 9 a, 9 b are preferably designed here in the form of a quick-coupling connection, so that a tight connection of the two components 9 a, 9 b can be carried out in a quick and reliable as well as fail-safe way. The same applies analogously to the loosening of the connection.
  • As is further indicated in the diagrammatic depiction of the single figure, the connecting counter-element 9 b can be connected here to a reducing agent reservoir 12, which, e.g., is preferably a component of a stationary or mobile desulfurization device 13, which is indicated in broken lines in FIG. 1, via a hose line 10, by interposing a control and regulating device 11. This desulfurization device 13 can form, e.g., a service point at a motor vehicle repair shop, in which during service of the motor vehicle, the connecting counter-element 9 b is connected to the exhaust gas line connecting element 9 a in order to add a preset amount of reducing agent to regenerate the NOx storage catalyst 5 in the exhaust gas line 2 when the motor vehicle is parked, or the internal combustion engine is idling, controlled or regulated as required by the control and/or regulating device 11, for a preset time period. The added reducing agent is preferably, as is the fuel, by means of which the internal combustion engine 1 is operated, a low-sulfur mixture of substances that has sulfur values of below 30 ppm.
  • As is further diagrammatically indicated in the single figure by the heating coil 14, the reducing agent of the desulfurization device 13 can also be preheated to be fed or added in the heated state to the exhaust gas line 2.
  • Moreover, a component of the desulfurization device 13 can also be a pumping device, by means of which it is ensured that the added reducing agent is added to the exhaust gas line at a specific pressure. In this connection, in particular in the area of the connecting element 9 a, a nozzle device is preferably provided, by means of which a fine distribution of the added reducing agent into the exhaust gas line 2 is possible.
  • In principle, corresponding communication devices would also make it possible for this service point to communicate with the engine control of the respective motor vehicle during the regeneration; such communication would perform a “reset” subsequent to a successful regeneration.
  • In addition, sensor data, such as, for example, temperature and/or lambda values, from the engine control device could also be used for monitoring or regulating.

Claims (19)

1. A method for the addition of a reducing agent in an exhaust gas line of an internal combustion engine of a motor vehicle,
with at least one NOx storage catalyst that is arranged in the gas line of the internal combustion engine, and
with a metering device, by means of which a preset amount of a reducing agent is introduced into the exhaust gas line at preset times, wherein
the metering device is created from a stationary gas line connecting element that is made up of multiple parts at a defined position on the exhaust gas line and a connecting counter-element that can be connected in a detachable manner to this connecting element and that can be arranged independently of the exhaust gas line and motor vehicle and in particular removed from the motor vehicle, in such a way that the connecting counter-element, for service, in particular when the motor vehicle is parked and/or the internal combustion engine is idling, is connected to the exhaust gas line connecting element, and then, for purposes of regeneration of at least one NOx storage catalyst for a preset time, a preset amount of reducing agent is introduced into the exhaust gas line, whereby after the regeneration, the connecting counter-element can again be detached from the exhaust gas line connecting element.
2. The method according to claim 1, wherein the internal combustion engine is operated with a fuel whose sulfur content is less than or equal to 30 ppm, in particular less than or equal to 10 ppm.
3. The method according to claim 1, wherein the reducing agent is a mixture of substances with a sulfur content of less than or equal to 30 ppm, in particular less than or equal to 10 ppm.
4. The method according to one of claims 1, wherein the reducing agent is heated to a preset reducing agent temperature before the addition.
5. The method according to one of claims 1, wherein the regeneration speed of the internal combustion engine that is preset for service or regeneration is the idle speed of the internal combustion engine.
6. A device for the addition of a reducing agent in an exhaust gas line of an internal combustion engine of a motor vehicle, with at least one NOx storage catalyst that is arranged in the exhaust gas line of the internal combustion engine, and
with a metering device, by means of which at preset times, a preset amount of a reducing agent can be introduced into the exhaust gas line, wherein the metering device is created from a stationary gas line connecting element that is made up of multiple parts at a defined position on the exhaust gas line and a connecting counter-element that can be connected in a detachable manner to this connecting element and that can be arranged independently of the exhaust gas line and motor vehicle, in particular removed from the motor vehicle.
7. The device according to claim 6, wherein the connecting counter-element is a component of a stationary or mobile desulfurization device that is arranged at a service facility or an auto repair shop.
8. The device according to claim 6, wherein the connecting counter-element and the exhaust gas line connecting element are connected to one another in a detachable manner with a quick-coupling connection that is designed to be gas-tight and/or liquid-tight when in the connected state.
9. The device according to claim 7, wherein the desulfurization device has a reducing agent reservoir for a reducing agent as well as a control and/or regulating device for defined charging of the exhaust gas line with a reducing agent.
10. The device according to claim 9, wherein the desulfurization device has a line connection, in particular a hose line connection, between the reducing agent reservoir and the connecting counter-element, and wherein the control and/or regulating device is coupled indirectly or directly into the hose line connection in the area between the connecting counter-element and the reducing agent reservoir.
11. The device according to one of claims 7, wherein the desulfurization device has a heating device by means of which the reducing agent can be heated to a preset temperature.
12. The device according to one of claims 6 wherein the exhaust gas line connecting element is arranged in the exhaust gas line in the area between a diesel particle filter and an NOx storage catalyst.
13. A method of desulferizing the catalytic converter of a motor vehicle comprising:
detachably connecting a fluid line to a portion of the exhaust gas line of said vehicle, between the engine and catalytic converter thereof, when said vehicle is located at a selected site; and
introducing a sulfur reducing agent into said exhaust gas line, through said fluid line.
14. A method according to claim 13 including operating said engine under a selected condition during introduction of said agent.
15. A method according to claim 13 including heating said reducing agent.
16. A method according to claim 13 including introducing said agent for a selected period of time.
17. A system for desulferizing the catalytic converter of a motor vehicle comprising:
means for holding supply of a sulfur reducing agent at a selected site, provided with a line for dispensing said agent, detachably connectable to a portion of the exhaust gas line between the engine and the catalytic converter of a vehicle situated at said selected site; and
means for metering a supply of said agent through said dispensing line.
18. A system according to claim 17 including means for heating said agent.
19. A system according to claim 17 wherein said dispensing line and said portion of said exhaust gas line are provided with fluid coupling members,
US12/552,844 2008-09-03 2009-09-02 Method and Device for Addition of a Reducing Agent in an Exhaust Gas Line of an Internal Combustion Engine of a Motor Vehicle Abandoned US20100050599A1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140083082A1 (en) * 2012-09-21 2014-03-27 Fev Gmbh Method for regenerating a nitrogen oxide storage catalytic converter and a device for this purpose
US9657665B2 (en) * 2013-02-25 2017-05-23 Cummins Inc. System, method, and apparatus for sulfur recovery on an SCR catalyst

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5394692A (en) * 1992-08-14 1995-03-07 Ernst-Apparatebau Gmbh & Co. Soot filter with hot gas generator
US20020112466A1 (en) * 2000-12-12 2002-08-22 Roos Joseph W. Lean burn emissions system protectant composition and method
US6823664B2 (en) * 2001-12-07 2004-11-30 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification device
US20080035187A1 (en) * 2006-08-14 2008-02-14 Cory Andrew Brown Fuel supply component cleaning system
US20080066454A1 (en) * 2006-09-20 2008-03-20 Gm Global Technology Operations, Inc. Apparatus and Method to Inject a Reductant into an Exhaust Gas Feedstream

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19919426C1 (en) * 1999-04-28 2000-03-30 Siemens Ag Valve mounting for dosing valve of IC engine exhaust gas catalyser
DE10223595A1 (en) * 2002-05-27 2003-12-11 Volkswagen Ag Method for operating a motor vehicle with a NOx storage catalytic converter
DE102005034344A1 (en) * 2005-07-22 2007-01-25 Umicore Ag & Co. Kg Process for the reactivation of thermally aged nitrogen oxide storage catalysts
US7469533B2 (en) * 2006-04-27 2008-12-30 Ford Global Technologies, Llc Brake torque load generation process for diesel particulate filter regeneration and SOx removal from lean NOx trap
DE102006049531A1 (en) * 2006-10-20 2008-04-24 Robert Bosch Gmbh Connection unit for mounting in an exhaust system of an internal combustion engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5394692A (en) * 1992-08-14 1995-03-07 Ernst-Apparatebau Gmbh & Co. Soot filter with hot gas generator
US20020112466A1 (en) * 2000-12-12 2002-08-22 Roos Joseph W. Lean burn emissions system protectant composition and method
US6823664B2 (en) * 2001-12-07 2004-11-30 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification device
US20080035187A1 (en) * 2006-08-14 2008-02-14 Cory Andrew Brown Fuel supply component cleaning system
US20080066454A1 (en) * 2006-09-20 2008-03-20 Gm Global Technology Operations, Inc. Apparatus and Method to Inject a Reductant into an Exhaust Gas Feedstream

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140083082A1 (en) * 2012-09-21 2014-03-27 Fev Gmbh Method for regenerating a nitrogen oxide storage catalytic converter and a device for this purpose
US9382827B2 (en) * 2012-09-21 2016-07-05 Fev Gmbh Method for regenerating a nitrogen oxide storage catalytic converter and a device for this purpose
US9657665B2 (en) * 2013-02-25 2017-05-23 Cummins Inc. System, method, and apparatus for sulfur recovery on an SCR catalyst

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